diff --git a/java/AndroidManifest.xml b/java/AndroidManifest.xml
index 031d62e..0d80c03 100644
--- a/java/AndroidManifest.xml
+++ b/java/AndroidManifest.xml
@@ -18,7 +18,7 @@
         coreApp="true"
         package="com.android.inputmethod.latin">
 
-    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="17" />
+    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="19" />
 
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
@@ -32,7 +32,7 @@
     <uses-permission android:name="android.permission.WRITE_USER_DICTIONARY" />
 
     <application android:label="@string/english_ime_name"
-            android:icon="@mipmap/ic_launcher_keyboard"
+            android:icon="@drawable/ic_launcher_keyboard"
             android:killAfterRestore="false"
             android:supportsRtl="true">
 
@@ -57,7 +57,7 @@
 
         <activity android:name=".setup.SetupActivity"
                 android:label="@string/english_ime_name"
-                android:icon="@mipmap/ic_launcher_keyboard"
+                android:icon="@drawable/ic_launcher_keyboard"
                 android:launchMode="singleTask"
                 android:noHistory="true">
             <intent-filter>
diff --git a/java/res/drawable-hdpi/btn_keyboard_key_normal.9.png b/java/res/drawable-hdpi/btn_keyboard_key_normal.9.png
deleted file mode 100644
index 3e25180..0000000
--- a/java/res/drawable-hdpi/btn_keyboard_key_normal.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-hdpi/btn_keyboard_key_normal_off.9.png b/java/res/drawable-hdpi/btn_keyboard_key_normal_off.9.png
deleted file mode 100644
index bad360f..0000000
--- a/java/res/drawable-hdpi/btn_keyboard_key_normal_off.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-hdpi/btn_keyboard_key_normal_on.9.png b/java/res/drawable-hdpi/btn_keyboard_key_normal_on.9.png
deleted file mode 100644
index 49f5198..0000000
--- a/java/res/drawable-hdpi/btn_keyboard_key_normal_on.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-hdpi/btn_keyboard_key_pressed.9.png b/java/res/drawable-hdpi/btn_keyboard_key_pressed.9.png
deleted file mode 100644
index e784edd..0000000
--- a/java/res/drawable-hdpi/btn_keyboard_key_pressed.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-hdpi/btn_keyboard_key_pressed_off.9.png b/java/res/drawable-hdpi/btn_keyboard_key_pressed_off.9.png
deleted file mode 100644
index a4731cf..0000000
--- a/java/res/drawable-hdpi/btn_keyboard_key_pressed_off.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-hdpi/btn_keyboard_key_pressed_on.9.png b/java/res/drawable-hdpi/btn_keyboard_key_pressed_on.9.png
deleted file mode 100644
index 03e163c..0000000
--- a/java/res/drawable-hdpi/btn_keyboard_key_pressed_on.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-hdpi/ic_launcher_keyboard.png b/java/res/drawable-hdpi/ic_launcher_keyboard.png
new file mode 100644
index 0000000..7ae00ed
--- /dev/null
+++ b/java/res/drawable-hdpi/ic_launcher_keyboard.png
Binary files differ
diff --git a/java/res/drawable-hdpi/ic_subtype_mic_dark.png b/java/res/drawable-hdpi/ic_subtype_mic_dark.png
deleted file mode 100644
index eacbcd2..0000000
--- a/java/res/drawable-hdpi/ic_subtype_mic_dark.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-hdpi/keyboard_key_feedback_background_klp.9.png b/java/res/drawable-hdpi/keyboard_key_feedback_background_klp.9.png
index 50ed568..be39415 100644
--- a/java/res/drawable-hdpi/keyboard_key_feedback_background_klp.9.png
+++ b/java/res/drawable-hdpi/keyboard_key_feedback_background_klp.9.png
Binary files differ
diff --git a/java/res/drawable-hdpi/sym_keyboard_settings_holo_dark.png b/java/res/drawable-hdpi/sym_keyboard_settings_holo_dark.png
index 5af09ad..2ea4a74 100644
--- a/java/res/drawable-hdpi/sym_keyboard_settings_holo_dark.png
+++ b/java/res/drawable-hdpi/sym_keyboard_settings_holo_dark.png
Binary files differ
diff --git a/java/res/drawable-mdpi/btn_keyboard_key_normal.9.png b/java/res/drawable-mdpi/btn_keyboard_key_normal.9.png
deleted file mode 100644
index 12bc979..0000000
--- a/java/res/drawable-mdpi/btn_keyboard_key_normal.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/btn_keyboard_key_normal_off.9.png b/java/res/drawable-mdpi/btn_keyboard_key_normal_off.9.png
deleted file mode 100644
index 44bd414..0000000
--- a/java/res/drawable-mdpi/btn_keyboard_key_normal_off.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/btn_keyboard_key_normal_on.9.png b/java/res/drawable-mdpi/btn_keyboard_key_normal_on.9.png
deleted file mode 100644
index 43fdf5b..0000000
--- a/java/res/drawable-mdpi/btn_keyboard_key_normal_on.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/btn_keyboard_key_pressed.9.png b/java/res/drawable-mdpi/btn_keyboard_key_pressed.9.png
deleted file mode 100644
index 1c1f3d7..0000000
--- a/java/res/drawable-mdpi/btn_keyboard_key_pressed.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/btn_keyboard_key_pressed_off.9.png b/java/res/drawable-mdpi/btn_keyboard_key_pressed_off.9.png
deleted file mode 100644
index dacb675..0000000
--- a/java/res/drawable-mdpi/btn_keyboard_key_pressed_off.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/btn_keyboard_key_pressed_on.9.png b/java/res/drawable-mdpi/btn_keyboard_key_pressed_on.9.png
deleted file mode 100644
index 3daa69f..0000000
--- a/java/res/drawable-mdpi/btn_keyboard_key_pressed_on.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/ic_launcher_keyboard.png b/java/res/drawable-mdpi/ic_launcher_keyboard.png
new file mode 100644
index 0000000..cc73f3b
--- /dev/null
+++ b/java/res/drawable-mdpi/ic_launcher_keyboard.png
Binary files differ
diff --git a/java/res/drawable-mdpi/keyboard_key_feedback_background_klp.9.png b/java/res/drawable-mdpi/keyboard_key_feedback_background_klp.9.png
index 564f546..625490b 100644
--- a/java/res/drawable-mdpi/keyboard_key_feedback_background_klp.9.png
+++ b/java/res/drawable-mdpi/keyboard_key_feedback_background_klp.9.png
Binary files differ
diff --git a/java/res/drawable-mdpi/sym_keyboard_label_mic_holo_dark.png b/java/res/drawable-mdpi/sym_keyboard_label_mic_holo_dark.png
deleted file mode 100644
index 537f39b..0000000
--- a/java/res/drawable-mdpi/sym_keyboard_label_mic_holo_dark.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/sym_keyboard_mic_holo_light.png b/java/res/drawable-mdpi/sym_keyboard_mic_holo_light.png
deleted file mode 100644
index 84a63dc..0000000
--- a/java/res/drawable-mdpi/sym_keyboard_mic_holo_light.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-mdpi/sym_keyboard_settings_holo_dark.png b/java/res/drawable-mdpi/sym_keyboard_settings_holo_dark.png
index 36c8c96..613f4dc 100644
--- a/java/res/drawable-mdpi/sym_keyboard_settings_holo_dark.png
+++ b/java/res/drawable-mdpi/sym_keyboard_settings_holo_dark.png
Binary files differ
diff --git a/java/res/drawable-xhdpi/btn_keyboard_key_normal.9.png b/java/res/drawable-xhdpi/btn_keyboard_key_normal.9.png
deleted file mode 100644
index 026005d..0000000
--- a/java/res/drawable-xhdpi/btn_keyboard_key_normal.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xhdpi/btn_keyboard_key_normal_off.9.png b/java/res/drawable-xhdpi/btn_keyboard_key_normal_off.9.png
deleted file mode 100644
index 38c5f24..0000000
--- a/java/res/drawable-xhdpi/btn_keyboard_key_normal_off.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xhdpi/btn_keyboard_key_normal_on.9.png b/java/res/drawable-xhdpi/btn_keyboard_key_normal_on.9.png
deleted file mode 100644
index f1223e5..0000000
--- a/java/res/drawable-xhdpi/btn_keyboard_key_normal_on.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xhdpi/btn_keyboard_key_pressed.9.png b/java/res/drawable-xhdpi/btn_keyboard_key_pressed.9.png
deleted file mode 100644
index ec35db5..0000000
--- a/java/res/drawable-xhdpi/btn_keyboard_key_pressed.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xhdpi/btn_keyboard_key_pressed_off.9.png b/java/res/drawable-xhdpi/btn_keyboard_key_pressed_off.9.png
deleted file mode 100644
index bd30464..0000000
--- a/java/res/drawable-xhdpi/btn_keyboard_key_pressed_off.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xhdpi/btn_keyboard_key_pressed_on.9.png b/java/res/drawable-xhdpi/btn_keyboard_key_pressed_on.9.png
deleted file mode 100644
index a3ff5d1..0000000
--- a/java/res/drawable-xhdpi/btn_keyboard_key_pressed_on.9.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xhdpi/ic_launcher_keyboard.png b/java/res/drawable-xhdpi/ic_launcher_keyboard.png
new file mode 100644
index 0000000..f2ac50d
--- /dev/null
+++ b/java/res/drawable-xhdpi/ic_launcher_keyboard.png
Binary files differ
diff --git a/java/res/drawable-xhdpi/ic_subtype_mic_dark.png b/java/res/drawable-xhdpi/ic_subtype_mic_dark.png
deleted file mode 100644
index 17581ba..0000000
--- a/java/res/drawable-xhdpi/ic_subtype_mic_dark.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xhdpi/keyboard_key_feedback_background_klp.9.png b/java/res/drawable-xhdpi/keyboard_key_feedback_background_klp.9.png
index e8c65f6..c211d89 100644
--- a/java/res/drawable-xhdpi/keyboard_key_feedback_background_klp.9.png
+++ b/java/res/drawable-xhdpi/keyboard_key_feedback_background_klp.9.png
Binary files differ
diff --git a/java/res/drawable-xhdpi/sym_keyboard_settings_holo_dark.png b/java/res/drawable-xhdpi/sym_keyboard_settings_holo_dark.png
index 99ee97d..15a9739 100644
--- a/java/res/drawable-xhdpi/sym_keyboard_settings_holo_dark.png
+++ b/java/res/drawable-xhdpi/sym_keyboard_settings_holo_dark.png
Binary files differ
diff --git a/java/res/drawable-xxhdpi/ic_launcher_keyboard.png b/java/res/drawable-xxhdpi/ic_launcher_keyboard.png
new file mode 100644
index 0000000..df386e8
--- /dev/null
+++ b/java/res/drawable-xxhdpi/ic_launcher_keyboard.png
Binary files differ
diff --git a/java/res/drawable-xxhdpi/ic_subtype_mic_dark.png b/java/res/drawable-xxhdpi/ic_subtype_mic_dark.png
deleted file mode 100644
index 811103a..0000000
--- a/java/res/drawable-xxhdpi/ic_subtype_mic_dark.png
+++ /dev/null
Binary files differ
diff --git a/java/res/drawable-xxhdpi/keyboard_key_feedback_background_klp.9.png b/java/res/drawable-xxhdpi/keyboard_key_feedback_background_klp.9.png
index 11eee94..fd2f9e5 100644
--- a/java/res/drawable-xxhdpi/keyboard_key_feedback_background_klp.9.png
+++ b/java/res/drawable-xxhdpi/keyboard_key_feedback_background_klp.9.png
Binary files differ
diff --git a/java/res/drawable-xxhdpi/sym_keyboard_settings_holo_dark.png b/java/res/drawable-xxhdpi/sym_keyboard_settings_holo_dark.png
index 7041bb6..bf643e1 100644
--- a/java/res/drawable-xxhdpi/sym_keyboard_settings_holo_dark.png
+++ b/java/res/drawable-xxhdpi/sym_keyboard_settings_holo_dark.png
Binary files differ
diff --git a/java/res/drawable/btn_keyboard_spacebar_gb.xml b/java/res/drawable/btn_keyboard_spacebar_gb.xml
new file mode 100644
index 0000000..4d51f3c
--- /dev/null
+++ b/java/res/drawable/btn_keyboard_spacebar_gb.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true"
+          android:drawable="@drawable/btn_keyboard_key_light_pressed" />
+    <item android:drawable="@drawable/btn_keyboard_key_light_normal" />
+</selector>
diff --git a/java/res/drawable/btn_keyboard_spacebar_ics.xml b/java/res/drawable/btn_keyboard_spacebar_ics.xml
new file mode 100644
index 0000000..4530ea0
--- /dev/null
+++ b/java/res/drawable/btn_keyboard_spacebar_ics.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true"
+          android:drawable="@drawable/btn_keyboard_key_light_pressed_ics" />
+    <item android:drawable="@drawable/btn_keyboard_key_light_normal_holo" />
+</selector>
diff --git a/java/res/drawable/btn_keyboard_spacebar_klp.xml b/java/res/drawable/btn_keyboard_spacebar_klp.xml
new file mode 100644
index 0000000..6b07a39
--- /dev/null
+++ b/java/res/drawable/btn_keyboard_spacebar_klp.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true"
+          android:drawable="@drawable/btn_keyboard_key_light_pressed_klp" />
+    <item android:drawable="@drawable/btn_keyboard_key_light_normal_holo" />
+</selector>
diff --git a/java/res/layout/emoji_keyboard_page.xml b/java/res/layout/emoji_keyboard_page.xml
index e0b752b..9afad36 100644
--- a/java/res/layout/emoji_keyboard_page.xml
+++ b/java/res/layout/emoji_keyboard_page.xml
@@ -18,16 +18,9 @@
 */
 -->
 
-<com.android.inputmethod.keyboard.internal.ScrollViewWithNotifier
+<com.android.inputmethod.keyboard.internal.EmojiPageKeyboardView
     xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/emoji_keyboard_scroller"
-    android:clipToPadding="false"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
->
-    <com.android.inputmethod.keyboard.internal.ScrollKeyboardView
-        android:id="@+id/emoji_keyboard_page"
-        android:layoutDirection="ltr"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content" />
-</com.android.inputmethod.keyboard.internal.ScrollViewWithNotifier>
+    android:id="@+id/emoji_keyboard_page"
+    android:layoutDirection="ltr"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content" />
diff --git a/java/res/layout/emoji_palettes_view.xml b/java/res/layout/emoji_palettes_view.xml
index 1c6da90..b252859 100644
--- a/java/res/layout/emoji_palettes_view.xml
+++ b/java/res/layout/emoji_palettes_view.xml
@@ -29,7 +29,7 @@
     <LinearLayout
         android:orientation="horizontal"
         android:layout_width="match_parent"
-        android:layout_height="@dimen/suggestions_strip_height"
+        android:layout_height="@dimen/config_suggestions_strip_height"
     >
         <TabHost
             android:id="@+id/emoji_category_tabhost"
@@ -73,7 +73,7 @@
             android:background="@color/emoji_key_background_color"
             android:src="@drawable/sym_keyboard_delete_holo_dark" />
     </LinearLayout>
-    <android.support.v4.view.ViewPager
+    <com.android.inputmethod.keyboard.internal.CustomViewPager
         android:id="@+id/emoji_keyboard_pager"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
diff --git a/java/res/layout/hint_add_to_dictionary.xml b/java/res/layout/hint_add_to_dictionary.xml
index 68a9faf..d429082 100644
--- a/java/res/layout/hint_add_to_dictionary.xml
+++ b/java/res/layout/hint_add_to_dictionary.xml
@@ -23,7 +23,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:textSize="@dimen/suggestion_text_size"
+    android:textSize="@dimen/config_suggestion_text_size"
     android:gravity="center"
     android:paddingLeft="0dp"
     android:paddingTop="0dp"
diff --git a/java/res/layout/input_view.xml b/java/res/layout/input_view.xml
index 1e7a384..ed387e5 100644
--- a/java/res/layout/input_view.xml
+++ b/java/res/layout/input_view.xml
@@ -41,10 +41,10 @@
             android:id="@+id/suggestion_strip_view"
             android:layoutDirection="ltr"
             android:layout_width="match_parent"
-            android:layout_height="@dimen/suggestions_strip_height"
+            android:layout_height="@dimen/config_suggestions_strip_height"
             android:gravity="center_vertical"
-            android:paddingRight="@dimen/suggestions_strip_padding"
-            android:paddingLeft="@dimen/suggestions_strip_padding"
+            android:paddingRight="@dimen/config_suggestions_strip_horizontal_padding"
+            android:paddingLeft="@dimen/config_suggestions_strip_horizontal_padding"
             style="?attr/suggestionStripViewStyle" />
 
         <!-- To ensure that key preview popup is correctly placed when the current system locale is
diff --git a/java/res/layout/key_preview_klp.xml b/java/res/layout/key_preview.xml
similarity index 93%
rename from java/res/layout/key_preview_klp.xml
rename to java/res/layout/key_preview.xml
index 160aeb9..16d4c72 100644
--- a/java/res/layout/key_preview_klp.xml
+++ b/java/res/layout/key_preview.xml
@@ -21,7 +21,7 @@
 <TextView xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:background="@drawable/keyboard_key_feedback_klp"
     android:minWidth="32dp"
     android:gravity="center"
+    style="?attr/keyPreviewTextViewStyle"
 />
diff --git a/java/res/layout/key_preview_gb.xml b/java/res/layout/key_preview_gb.xml
deleted file mode 100644
index 2f2a321..0000000
--- a/java/res/layout/key_preview_gb.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2010, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:background="@drawable/keyboard_key_feedback_gb"
-    android:minWidth="32dp"
-    android:gravity="center"
-/>
diff --git a/java/res/layout/key_preview_ics.xml b/java/res/layout/key_preview_ics.xml
deleted file mode 100644
index 33b6947..0000000
--- a/java/res/layout/key_preview_ics.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2013, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:background="@drawable/keyboard_key_feedback_ics"
-    android:minWidth="32dp"
-    android:gravity="center"
-/>
diff --git a/java/res/layout/more_keys_keyboard.xml b/java/res/layout/more_keys_keyboard.xml
index 6637117..f3795af 100644
--- a/java/res/layout/more_keys_keyboard.xml
+++ b/java/res/layout/more_keys_keyboard.xml
@@ -22,11 +22,9 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:orientation="horizontal"
-    style="?attr/moreKeysKeyboardContainerStyle"
+    android:orientation="vertical"
 >
     <com.android.inputmethod.keyboard.MoreKeysKeyboardView
-        xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
         android:id="@+id/more_keys_keyboard_view"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content" />
diff --git a/java/res/layout/more_suggestions.xml b/java/res/layout/more_suggestions.xml
index 8659f07..0869992 100644
--- a/java/res/layout/more_suggestions.xml
+++ b/java/res/layout/more_suggestions.xml
@@ -22,16 +22,15 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:orientation="horizontal"
-    style="?attr/moreKeysKeyboardContainerStyle"
+    android:orientation="vertical"
 >
     <com.android.inputmethod.latin.suggestions.MoreSuggestionsView
         xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
         android:id="@+id/more_suggestions_view"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        latin:keyLetterSize="@dimen/suggestion_text_size"
-        latin:keyLabelSize="@dimen/suggestion_text_size"
-        latin:keyHintLetterRatio="@fraction/more_suggestions_info_ratio"
+        latin:keyLetterSize="@dimen/config_suggestion_text_size"
+        latin:keyLabelSize="@dimen/config_suggestion_text_size"
+        latin:keyHintLetterRatio="@fraction/config_more_suggestions_info_ratio"
         latin:keyHintLetterColor="@android:color/white" />
 </LinearLayout>
diff --git a/java/res/layout/suggestion_word.xml b/java/res/layout/suggestion_word.xml
index c82a13c..47d2bd8 100644
--- a/java/res/layout/suggestion_word.xml
+++ b/java/res/layout/suggestion_word.xml
@@ -24,12 +24,12 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:minWidth="@dimen/suggestion_min_width"
-    android:textSize="@dimen/suggestion_text_size"
+    android:minWidth="@dimen/config_suggestion_min_width"
+    android:textSize="@dimen/config_suggestion_text_size"
     android:gravity="center"
-    android:paddingLeft="@dimen/suggestion_padding"
+    android:paddingLeft="@dimen/config_suggestion_text_horizontal_padding"
     android:paddingTop="0dp"
-    android:paddingRight="@dimen/suggestion_padding"
+    android:paddingRight="@dimen/config_suggestion_text_horizontal_padding"
     android:paddingBottom="0dp"
     android:hapticFeedbackEnabled="false"
     android:focusable="false"
diff --git a/java/res/layout/user_dictionary_add_word.xml b/java/res/layout/user_dictionary_add_word.xml
index bbf9b1b..607f5c4 100644
--- a/java/res/layout/user_dictionary_add_word.xml
+++ b/java/res/layout/user_dictionary_add_word.xml
@@ -52,7 +52,7 @@
         android:hint="@string/user_dict_settings_add_word_hint"
         android:imeOptions="flagNoFullscreen"
         android:inputType="textNoSuggestions"
-        android:maxLength="@integer/user_dictionary_max_word_length" >
+        android:maxLength="@integer/config_user_dictionary_max_word_length" >
 
         <requestFocus />
     </EditText>
diff --git a/java/res/layout/user_dictionary_add_word_fullscreen.xml b/java/res/layout/user_dictionary_add_word_fullscreen.xml
index 219485b..9bcb189 100644
--- a/java/res/layout/user_dictionary_add_word_fullscreen.xml
+++ b/java/res/layout/user_dictionary_add_word_fullscreen.xml
@@ -30,7 +30,7 @@
         android:hint="@string/user_dict_settings_add_word_hint"
         android:imeOptions="flagNoFullscreen"
         android:inputType="textNoSuggestions"
-        android:maxLength="@integer/user_dictionary_max_word_length" >
+        android:maxLength="@integer/config_user_dictionary_max_word_length" >
 
         <requestFocus />
     </EditText>
@@ -61,7 +61,7 @@
             android:hint="@string/user_dict_settings_add_shortcut_hint"
             android:imeOptions="flagNoFullscreen"
             android:inputType="textNoSuggestions"
-            android:maxLength="@integer/user_dictionary_max_word_length" />
+            android:maxLength="@integer/config_user_dictionary_max_word_length" />
 
         <TextView
             android:id="@+id/user_dictionary_add_locale_label"
diff --git a/java/res/mipmap-hdpi/ic_launcher_keyboard.png b/java/res/mipmap-hdpi/ic_launcher_keyboard.png
deleted file mode 100644
index 36b1cca..0000000
--- a/java/res/mipmap-hdpi/ic_launcher_keyboard.png
+++ /dev/null
Binary files differ
diff --git a/java/res/mipmap-mdpi/ic_launcher_keyboard.png b/java/res/mipmap-mdpi/ic_launcher_keyboard.png
deleted file mode 100644
index 67ef189..0000000
--- a/java/res/mipmap-mdpi/ic_launcher_keyboard.png
+++ /dev/null
Binary files differ
diff --git a/java/res/mipmap-xhdpi/ic_launcher_keyboard.png b/java/res/mipmap-xhdpi/ic_launcher_keyboard.png
deleted file mode 100644
index b332083..0000000
--- a/java/res/mipmap-xhdpi/ic_launcher_keyboard.png
+++ /dev/null
Binary files differ
diff --git a/java/res/mipmap-xxhdpi/ic_launcher_keyboard.png b/java/res/mipmap-xxhdpi/ic_launcher_keyboard.png
deleted file mode 100644
index acc424f..0000000
--- a/java/res/mipmap-xxhdpi/ic_launcher_keyboard.png
+++ /dev/null
Binary files differ
diff --git a/java/res/raw/main_de.dict b/java/res/raw/main_de.dict
index 69796bb..c65698d 100644
--- a/java/res/raw/main_de.dict
+++ b/java/res/raw/main_de.dict
Binary files differ
diff --git a/java/res/values-af/strings.xml b/java/res/values-af/strings.xml
index 045e97d..8600b72 100644
--- a/java/res/values-af/strings.xml
+++ b/java/res/values-af/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Stelsel se verstek"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Stel kontakname voor"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Gebruik name van kontakte vir voorstelle en korreksies"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Gepersonaliseerde voorstelle"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Leer uit jou kommunikasie en getikte data om voorstelle te verbeter"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Dubbelspasie-punt"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dubbeltik op spasiebalk voeg \'n punt in, gevolg deur \'n spasie"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Outohoofletters"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"tyd"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Steminvoerinstellings"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Op hoofsleutelbord"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Op simbolesleutelbord"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Af"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofoon op hoofsleutelbord"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikrofoon op simbolesleutelbord"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Steminvoer is gedeaktiveer"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Stel invoermetodes op"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Invoertale"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Stuur terugvoer"</string>
diff --git a/java/res/values-am/strings.xml b/java/res/values-am/strings.xml
index 0b81034..3a248a8 100644
--- a/java/res/values-am/strings.xml
+++ b/java/res/values-am/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"የስርዓት ነባሪ"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"የዕውቂያ ስም ጠቁም"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"ከዕውቂያዎች ለጥቆማዎች እና ማስተካከያዎች ስሞች ተጠቀም"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"ግላዊ የጥቆማ አስተያየቶች"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"የጥቆማ አስተያየቶችን ለማሻሻል ከእርስዎ ግንኙነቶች እና የተተየበ ውሂብ ይማሩ"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"የድርብ-ክፍተት ነጥብ"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"የክፍተት አሞሌው ላይ ሁለቴ መታ ማድረግ አንድ ነጥብ እና ክፍተት አስከትሎ ያስገባል"</string>
     <string name="auto_cap" msgid="1719746674854628252">"ራስ-ሰር አቢይ ማድረግ"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ጊዜ"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"ዩ አር ኤል"</string>
     <string name="voice_input" msgid="3583258583521397548">"የድምፅ ግቤት ቁልፍ"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"በዋናቁልፍ ሰሌዳ ላይ"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"በምልክቶች ቁልፍ ሰሌዳ ላይ"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"ውጪ"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"ድምፅ ማጉያ በዋናው ቁልፍሰሌዳው ላይ"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"የድምፅ ማጉያ ምልክትበቁልፍ ሰሌዳላይ"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"የድምፅ ግቤት ቦዝኗል"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"ግቤት ሜተዶችን አዋቀር"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"ቋንቋዎች አግቤት"</string>
     <string name="send_feedback" msgid="1780431884109392046">"ግብረ-መልስ ላክ"</string>
diff --git a/java/res/values-ar/donottranslate.xml b/java/res/values-ar/config-spacing-and-punctuations.xml
similarity index 89%
rename from java/res/values-ar/donottranslate.xml
rename to java/res/values-ar/config-spacing-and-punctuations.xml
index 57de253..9e637e4 100644
--- a/java/res/values-ar/donottranslate.xml
+++ b/java/res/values-ar/config-spacing-and-punctuations.xml
@@ -21,5 +21,5 @@
     <!-- The all letters need to be mirrored are found at
          http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt -->
     <!-- Symbols that are suggested between words -->
-    <string name="suggested_punctuations">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
+    <string name="suggested_punctuations" translatable="false">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
 </resources>
diff --git a/java/res/values-ar/strings.xml b/java/res/values-ar/strings.xml
index da33119..b42cd29 100644
--- a/java/res/values-ar/strings.xml
+++ b/java/res/values-ar/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"الإعداد الافتراضي للنظام"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"اقتراح أسماء جهات الاتصال"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"استخدام الأسماء من جهات الاتصال للاقتراحات والتصحيحات"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"اقتراحات مخصصة"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"التعلم من اتصالاتك والبيانات التي تكتبها لتحسين الاقتراحات"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"نقطة المسافة المزدوجة"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"يؤدي النقر نقرًا مزدوجًا على مفتاح المسافة إلى إدخال نقطة متبوعة بمسافة"</string>
     <string name="auto_cap" msgid="1719746674854628252">"أحرف كبيرة تلقائيًا"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"الوقت"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"‏عنوان URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"مفتاح الإدخال الصوتي"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"لوحة مفاتيح رئيسية"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"لوحة مفاتيح الرموز"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"إيقاف"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"ميكروفون على لوحة مفاتيح رئيسية"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"ميكروفون على لوحة مفاتيح الرموز"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"الإدخال الصوتي مُعطل"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"تهيئة طرق الإدخال"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"لغات الإدخال"</string>
     <string name="send_feedback" msgid="1780431884109392046">"إرسال تعليقات"</string>
diff --git a/java/res/values-be/bools.xml b/java/res/values-be-rBY/bools.xml
similarity index 100%
rename from java/res/values-be/bools.xml
rename to java/res/values-be-rBY/bools.xml
diff --git a/java/res/values-be/strings-action-keys.xml b/java/res/values-be-rBY/strings-action-keys.xml
similarity index 100%
rename from java/res/values-be/strings-action-keys.xml
rename to java/res/values-be-rBY/strings-action-keys.xml
diff --git a/java/res/values-be/strings-appname.xml b/java/res/values-be/strings-appname.xml
deleted file mode 100644
index 2f9593b..0000000
--- a/java/res/values-be/strings-appname.xml
+++ /dev/null
@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- 
-/*
-**
-** Copyright 2013, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
- -->
-
-<resources xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <string name="english_ime_name" msgid="5940510615957428904">"Клавіятура Android (AOSP)"</string>
-    <string name="spell_checker_service_name" msgid="1254221805440242662">"Iнструмент праверкi правапiсу для Android (AOSP)"</string>
-    <string name="english_ime_settings" msgid="5760361067176802794">"Налады клавіятуры Android (AOSP)"</string>
-    <string name="android_spell_checker_settings" msgid="6123949487832861885">"Налады інструмента праверкі правапісу для Android (AOSP)"</string>
-</resources>
diff --git a/java/res/values-be/strings.xml b/java/res/values-be/strings.xml
deleted file mode 100644
index 02972f0..0000000
--- a/java/res/values-be/strings.xml
+++ /dev/null
@@ -1,253 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- 
-/*
-**
-** Copyright 2008, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
- -->
-
-<resources xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <string name="english_ime_input_options" msgid="3909945612939668554">"Параметры ўводу"</string>
-    <string name="english_ime_research_log" msgid="8492602295696577851">"Каманды гiсторыя даследаванняў"</string>
-    <string name="use_contacts_for_spellchecking_option_title" msgid="5374120998125353898">"Шукаць імёны кантактаў"</string>
-    <string name="use_contacts_for_spellchecking_option_summary" msgid="8754413382543307713">"Модуль праверкі правапісу выкарыстоўвае запісы са спісу кантактаў"</string>
-    <string name="vibrate_on_keypress" msgid="5258079494276955460">"Вібрацыя пры націску клавіш"</string>
-    <string name="sound_on_keypress" msgid="6093592297198243644">"Гук пры націску"</string>
-    <string name="popup_on_keypress" msgid="123894815723512944">"Па націску на клавішы ўсплывае акно"</string>
-    <string name="general_category" msgid="1859088467017573195">"Агульныя"</string>
-    <string name="correction_category" msgid="2236750915056607613">"Выпраўленне тэксту"</string>
-    <string name="gesture_typing_category" msgid="497263612130532630">"Набор жэстамі"</string>
-    <string name="misc_category" msgid="6894192814868233453">"Іншыя параметры"</string>
-    <string name="advanced_settings" msgid="362895144495591463">"Адмысловыя налады"</string>
-    <string name="advanced_settings_summary" msgid="4487980456152830271">"Функцыi для спецыялістаў"</string>
-    <string name="include_other_imes_in_language_switch_list" msgid="4533689960308565519">"Перакл. да інш. спос. ув."</string>
-    <string name="include_other_imes_in_language_switch_list_summary" msgid="840637129103317635">"Кнопка пераключэння мовы звязана i з iншымi спосабамi ўводу"</string>
-    <string name="show_language_switch_key" msgid="5915478828318774384">"Кнопка пераключэння мовы"</string>
-    <string name="show_language_switch_key_summary" msgid="7343403647474265713">"Паказваць, калі ўключана некалькі моў ўводу"</string>
-    <string name="sliding_key_input_preview" msgid="6604262359510068370">"Iндыкатар слайд-шоу"</string>
-    <string name="sliding_key_input_preview_summary" msgid="6340524345729093886">"Паказаць візуальны сігнал падчас слiзгання клавiш Shift або Symbol"</string>
-    <string name="key_preview_popup_dismiss_delay" msgid="6213164897443068248">"Затрым. скр. падк. клав."</string>
-    <string name="key_preview_popup_dismiss_no_delay" msgid="2096123151571458064">"Няма затрымкі"</string>
-    <string name="key_preview_popup_dismiss_default_delay" msgid="2166964333903906734">"Па змаўчанні"</string>
-    <string name="abbreviation_unit_milliseconds" msgid="8700286094028323363">"<xliff:g id="MILLISECONDS">%s</xliff:g> мс"</string>
-    <!-- no translation found for settings_system_default (6268225104743331821) -->
-    <skip />
-    <string name="use_contacts_dict" msgid="4435317977804180815">"Прапан. імёны кантактаў"</string>
-    <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Выкарыстоўваць імёны са спісу кантактаў для прапаноў і выпраўл."</string>
-    <string name="use_double_space_period" msgid="8781529969425082860">"Падвойны iнтэрвал"</string>
-    <string name="use_double_space_period_summary" msgid="6532892187247952799">"Падвойнае нацiсканне на прабел ўстаўляе iнтэрвал з наступным прабелам"</string>
-    <string name="auto_cap" msgid="1719746674854628252">"Аўтаматычна рабіць вялікія літары"</string>
-    <string name="auto_cap_summary" msgid="7934452761022946874">"Пісаць з загалоўнай літары першае слова ў кожным сказе"</string>
-    <string name="edit_personal_dictionary" msgid="3996910038952940420">"Персанальны слоўнік"</string>
-    <string name="configure_dictionaries_title" msgid="4238652338556902049">"Дадатковыя слоўнікі"</string>
-    <string name="main_dictionary" msgid="4798763781818361168">"Асноўны слоўнік"</string>
-    <string name="prefs_show_suggestions" msgid="8026799663445531637">"Паказаць прапановы на выпраўленне"</string>
-    <string name="prefs_show_suggestions_summary" msgid="1583132279498502825">"Паказваць прапанаваныя словы падчас набору тэксту"</string>
-    <string name="prefs_suggestion_visibility_show_name" msgid="3219916594067551303">"Заўсёды паказваць"</string>
-    <string name="prefs_suggestion_visibility_show_only_portrait_name" msgid="3859783767435239118">"Паказаць у партрэтным рэжыме"</string>
-    <string name="prefs_suggestion_visibility_hide_name" msgid="6309143926422234673">"Заўседы хаваць"</string>
-    <string name="prefs_block_potentially_offensive_title" msgid="5078480071057408934">"Блакіраваць абразлівыя словы"</string>
-    <string name="prefs_block_potentially_offensive_summary" msgid="2371835479734991364">"Не прапануйце патэнцыяльна абразлівых слоў"</string>
-    <string name="auto_correction" msgid="7630720885194996950">"Аўтавыпраўленне"</string>
-    <string name="auto_correction_summary" msgid="5625751551134658006">"Прабелы і пунктуацыйныя знакі дазваляюць аўтаматычна выпраўляць памылкова ўведзеныя словы"</string>
-    <string name="auto_correction_threshold_mode_off" msgid="8470882665417944026">"Адключаны"</string>
-    <string name="auto_correction_threshold_mode_modest" msgid="8788366690620799097">"Сціплы"</string>
-    <!-- no translation found for auto_correction_threshold_mode_aggressive (7319007299148899623) -->
-    <skip />
-    <!-- no translation found for auto_correction_threshold_mode_very_aggressive (1853309024129480416) -->
-    <skip />
-    <string name="bigram_prediction" msgid="1084449187723948550">"Падказкi для наступнага слова"</string>
-    <string name="bigram_prediction_summary" msgid="3896362682751109677">"Выкарыстоўваць папярэдняе слова, каб атрымлiваць падказкi"</string>
-    <string name="gesture_input" msgid="826951152254563827">"Уключыць набор жэстамі"</string>
-    <string name="gesture_input_summary" msgid="9180350639305731231">"Уводзьце слова, перасоўваючы палец па літарах"</string>
-    <string name="gesture_preview_trail" msgid="3802333369335722221">"Паказаць след жэста"</string>
-    <string name="gesture_floating_preview_text" msgid="4443240334739381053">"Дынамічны плаваючы прагляд"</string>
-    <string name="gesture_floating_preview_text_summary" msgid="4472696213996203533">"Праглядаць прапанаванае слова падчас жэсту"</string>
-    <string name="added_word" msgid="8993883354622484372">"<xliff:g id="WORD">%s</xliff:g> : Захаваныя"</string>
-    <string name="spoken_use_headphones" msgid="896961781287283493">"Каб праслухаць паролi, падключыце гарнiтуру."</string>
-    <string name="spoken_current_text_is" msgid="2485723011272583845">"Бягучы тэкст %s"</string>
-    <string name="spoken_no_text_entered" msgid="7479685225597344496">"Тэкст не ўведзены"</string>
-    <!-- no translation found for spoken_auto_correct (8005997889020109763) -->
-    <skip />
-    <!-- no translation found for spoken_auto_correct_obscured (6276420476908833791) -->
-    <skip />
-    <string name="spoken_description_unknown" msgid="3197434010402179157">"Клавішны код %d"</string>
-    <string name="spoken_description_shift" msgid="244197883292549308">"Зрух"</string>
-    <string name="spoken_description_shift_shifted" msgid="1681877323344195035">"Shift уключаны (націснiце, каб адключыць)"</string>
-    <string name="spoken_description_caps_lock" msgid="3276478269526304432">"Caps Lock уключаны (націснiце, каб адключыць)"</string>
-    <string name="spoken_description_delete" msgid="8740376944276199801">"Выдаліць"</string>
-    <string name="spoken_description_to_symbol" msgid="5486340107500448969">"Сімвалы"</string>
-    <string name="spoken_description_to_alpha" msgid="23129338819771807">"Літары"</string>
-    <string name="spoken_description_to_numeric" msgid="591752092685161732">"Лічбы"</string>
-    <string name="spoken_description_settings" msgid="4627462689603838099">"Налады"</string>
-    <string name="spoken_description_tab" msgid="2667716002663482248">"Укладка"</string>
-    <string name="spoken_description_space" msgid="2582521050049860859">"Прабел"</string>
-    <string name="spoken_description_mic" msgid="615536748882611950">"Галасавы ўвод"</string>
-    <string name="spoken_description_smiley" msgid="2256309826200113918">"Смайлік"</string>
-    <string name="spoken_description_return" msgid="8178083177238315647">"Увод"</string>
-    <string name="spoken_description_search" msgid="1247236163755920808">"Пошук"</string>
-    <string name="spoken_description_dot" msgid="40711082435231673">"Кропка"</string>
-    <string name="spoken_description_language_switch" msgid="5507091328222331316">"Пераключыць мову"</string>
-    <string name="spoken_description_action_next" msgid="8636078276664150324">"Далей"</string>
-    <string name="spoken_description_action_previous" msgid="800872415009336208">"Назад"</string>
-    <string name="spoken_description_shiftmode_on" msgid="5700440798609574589">"Shift уключаны"</string>
-    <string name="spoken_description_shiftmode_locked" msgid="593175803181701830">"Caps Lock уключаны"</string>
-    <string name="spoken_description_shiftmode_off" msgid="657219998449174808">"Shift адключаны"</string>
-    <string name="spoken_description_mode_symbol" msgid="7183343879909747642">"Рэжым знакаў"</string>
-    <string name="spoken_description_mode_alpha" msgid="3528307674390156956">"Рэжым лiтар"</string>
-    <string name="spoken_description_mode_phone" msgid="6520207943132026264">"Рэжым тэлефона"</string>
-    <string name="spoken_description_mode_phone_shift" msgid="5499629753962641227">"Рэжым тэлефонных знакаў"</string>
-    <string name="announce_keyboard_hidden" msgid="8718927835531429807">"Клавіятура схавана"</string>
-    <string name="announce_keyboard_mode" msgid="4729081055438508321">"Паказана клавiятура ў рэжыме \" <xliff:g id="MODE">%s</xliff:g>\""</string>
-    <string name="keyboard_mode_date" msgid="3137520166817128102">"дата"</string>
-    <string name="keyboard_mode_date_time" msgid="339593358488851072">"дата i час"</string>
-    <string name="keyboard_mode_email" msgid="6216248078128294262">"электронная пошта"</string>
-    <string name="keyboard_mode_im" msgid="1137405089766557048">"абмен паведамленнямі"</string>
-    <string name="keyboard_mode_number" msgid="7991623440699957069">"нумар"</string>
-    <string name="keyboard_mode_phone" msgid="6851627527401433229">"тэлефон"</string>
-    <string name="keyboard_mode_text" msgid="6479436687899701619">"тэкст"</string>
-    <string name="keyboard_mode_time" msgid="4381856885582143277">"час"</string>
-    <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
-    <string name="voice_input" msgid="3583258583521397548">"Ключ галасавога ўводу"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"На асн. клавіятуры"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"На сімв. клавіятуры"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Адключана"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Мік. на асн. клав."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Мік. на сімв. клав."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Галасавы набор адкл."</string>
-    <string name="configure_input_method" msgid="373356270290742459">"Налада метадаў уводу"</string>
-    <string name="language_selection_title" msgid="1651299598555326750">"Мовы ўводу"</string>
-    <string name="send_feedback" msgid="1780431884109392046">"Адправіць водгук"</string>
-    <string name="select_language" msgid="3693815588777926848">"Мовы ўводу"</string>
-    <string name="hint_add_to_dictionary" msgid="573678656946085380">"Дакраніцеся зноў, каб захаваць"</string>
-    <string name="has_dictionary" msgid="6071847973466625007">"Слоўнік даступны"</string>
-    <string name="prefs_enable_log" msgid="6620424505072963557">"Уключыць зваротную сувязь з карыстальнікамі"</string>
-    <string name="prefs_description_log" msgid="7525225584555429211">"Дапамажыце палепшыць гэты рэдактар ​​метаду ўводу, аўтаматычна адпраўляючы статыстыку выкарыстання і справаздачы аб збоях Google."</string>
-    <string name="keyboard_layout" msgid="8451164783510487501">"Тэма клавіятуры"</string>
-    <string name="subtype_en_GB" msgid="88170601942311355">"Англійская (ЗК)"</string>
-    <string name="subtype_en_US" msgid="6160452336634534239">"Англійская (ЗША)"</string>
-    <string name="subtype_es_US" msgid="5583145191430180200">"iспанская (ЗША)"</string>
-    <string name="subtype_with_layout_en_GB" msgid="2179097748724725906">"Англійская (Вялікабрытанія) (<xliff:g id="LAYOUT">%s</xliff:g>)"</string>
-    <string name="subtype_with_layout_en_US" msgid="1362581347576714579">"Англійская (ЗША) (<xliff:g id="LAYOUT">%s</xliff:g>)"</string>
-    <string name="subtype_with_layout_es_US" msgid="6261791057007890189">"iспанская (ЗША) ( <xliff:g id="LAYOUT">%s</xliff:g> )"</string>
-    <!-- no translation found for subtype_nepali_traditional (9032247506728040447) -->
-    <skip />
-    <!-- no translation found for subtype_no_language (7137390094240139495) -->
-    <skip />
-    <!-- no translation found for subtype_no_language_qwerty (244337630616742604) -->
-    <skip />
-    <!-- no translation found for subtype_no_language_qwertz (443066912507547976) -->
-    <skip />
-    <!-- no translation found for subtype_no_language_azerty (8144348527575640087) -->
-    <skip />
-    <!-- no translation found for subtype_no_language_dvorak (1564494667584718094) -->
-    <skip />
-    <!-- no translation found for subtype_no_language_colemak (5837418400010302623) -->
-    <skip />
-    <!-- no translation found for subtype_no_language_pcqwerty (5354918232046200018) -->
-    <skip />
-    <!-- no translation found for subtype_emoji (7483586578074549196) -->
-    <skip />
-    <string name="custom_input_styles_title" msgid="8429952441821251512">"Карыстальніцкія стылі ўводу"</string>
-    <string name="add_style" msgid="6163126614514489951">"Дадаць стыль"</string>
-    <string name="add" msgid="8299699805688017798">"Дадаць"</string>
-    <string name="remove" msgid="4486081658752944606">"Выдаліць"</string>
-    <string name="save" msgid="7646738597196767214">"Захаваць"</string>
-    <string name="subtype_locale" msgid="8576443440738143764">"Мова"</string>
-    <string name="keyboard_layout_set" msgid="4309233698194565609">"Раскладка"</string>
-    <string name="custom_input_style_note_message" msgid="8826731320846363423">"Карыстальніцкі метад уводу павінен быць уключаны, перш чым пачаць выкарыстоўваць яго. Жадаеце ўключыць яго зараз?"</string>
-    <string name="enable" msgid="5031294444630523247">"Уключыць"</string>
-    <string name="not_now" msgid="6172462888202790482">"Не цяпер"</string>
-    <string name="custom_input_style_already_exists" msgid="8008728952215449707">"Такі метад уводу ўжо існуе: <xliff:g id="INPUT_STYLE_NAME">%s</xliff:g>"</string>
-    <string name="prefs_usability_study_mode" msgid="1261130555134595254">"Рэжым даследвання выкарыстальнасці"</string>
-    <string name="prefs_key_longpress_timeout_settings" msgid="6102240298932897873">"Затрымка доўгага націску клавішы"</string>
-    <string name="prefs_keypress_vibration_duration_settings" msgid="7918341459947439226">"Працягласць вібрацыі пры націску клавіш"</string>
-    <string name="prefs_keypress_sound_volume_settings" msgid="6027007337036891623">"Гучнасць гуку пры націску клавіш"</string>
-    <string name="prefs_read_external_dictionary" msgid="2588931418575013067">"Чытанне знешняга файла слоўніка"</string>
-    <string name="read_external_dictionary_no_files_message" msgid="4947420942224623792">"У папцы загрузак няма файлаў слоўніка"</string>
-    <string name="read_external_dictionary_multiple_files_title" msgid="7637749044265808628">"Вылучыце файл слоўніка для ўсталёўкі"</string>
-    <string name="read_external_dictionary_confirm_install_message" msgid="6898610163768980870">"Сапраўды ўсталяваць гэты файл на мове: <xliff:g id="LOCALE_NAME">%s</xliff:g>?"</string>
-    <string name="error" msgid="8940763624668513648">"Была памылка"</string>
-    <string name="button_default" msgid="3988017840431881491">"Па змаўчанні"</string>
-    <string name="setup_welcome_title" msgid="6112821709832031715">"Вітаем у прыкладанні <xliff:g id="APPLICATION_NAME">%s</xliff:g>"</string>
-    <string name="setup_welcome_additional_description" msgid="8150252008545768953">"з уводам жэстамі"</string>
-    <string name="setup_start_action" msgid="8936036460897347708">"Пачаць"</string>
-    <string name="setup_next_action" msgid="371821437915144603">"Далей"</string>
-    <string name="setup_steps_title" msgid="6400373034871816182">"Наладка прыкладання <xliff:g id="APPLICATION_NAME">%s</xliff:g>"</string>
-    <string name="setup_step1_title" msgid="3147967630253462315">"Уключыць прыкладанне <xliff:g id="APPLICATION_NAME">%s</xliff:g>"</string>
-    <string name="setup_step1_instruction" msgid="2578631936624637241">"Праверце прыкладанне \"<xliff:g id="APPLICATION_NAME">%s</xliff:g>\" на сваёй мове і параметры ўводу. Гэта дасць магчымасць дазволіць яму працаваць на вашай прыладзе."</string>
-    <string name="setup_step1_finished_instruction" msgid="10761482004957994">"Прыкладанне <xliff:g id="APPLICATION_NAME">%s</xliff:g> ужо ўключана для вашай мовы і параметраў уводу, так што гэты крок зроблены. Пераходзім да наступнага!"</string>
-    <string name="setup_step1_action" msgid="4366513534999901728">"Уключыць у наладах"</string>
-    <string name="setup_step2_title" msgid="6860725447906690594">"Пераключыцца на прыкладанне <xliff:g id="APPLICATION_NAME">%s</xliff:g>."</string>
-    <string name="setup_step2_instruction" msgid="9141481964870023336">"Выберыце \"<xliff:g id="APPLICATION_NAME">%s</xliff:g>\" як актыўны метад уводу тэксту."</string>
-    <string name="setup_step2_action" msgid="1660330307159824337">"Пераключэнне метадаў уводу"</string>
-    <string name="setup_step3_title" msgid="3154757183631490281">"Усё гатова!"</string>
-    <string name="setup_step3_instruction" msgid="8025981829605426000">"Цяпер вы можаце ўводзіць ўсе свае любімыя прыкладанні з iмем <xliff:g id="APPLICATION_NAME">%s</xliff:g>."</string>
-    <string name="setup_step3_action" msgid="600879797256942259">"Наладка дадатковых моў"</string>
-    <string name="setup_finish_action" msgid="276559243409465389">"Гатова"</string>
-    <string name="show_setup_wizard_icon" msgid="5008028590593710830">"Паказаць значок прыкладання"</string>
-    <string name="show_setup_wizard_icon_summary" msgid="4119998322536880213">"Паказаць значок прыкладання ў панэлi запуску"</string>
-    <string name="app_name" msgid="6320102637491234792">"Пастаўшчык слоўніка"</string>
-    <string name="dictionary_provider_name" msgid="3027315045397363079">"Пастаўшчык слоўніка"</string>
-    <string name="dictionary_service_name" msgid="6237472350693511448">"Слоўнік"</string>
-    <string name="download_description" msgid="6014835283119198591">"Інфармацыя абнаўлення слоўніка"</string>
-    <string name="dictionary_settings_title" msgid="8091417676045693313">"Дадатковыя слоўнікі"</string>
-    <string name="dictionary_install_over_metered_network_prompt" msgid="3587517870006332980">"Даступны слоўнік"</string>
-    <string name="dictionary_settings_summary" msgid="5305694987799824349">"Налады для слоўнікаў"</string>
-    <string name="user_dictionaries" msgid="3582332055892252845">"Карыстальніцкія слоўнікі"</string>
-    <string name="default_user_dict_pref_name" msgid="1625055720489280530">"Карыстацкі слоўнік"</string>
-    <string name="dictionary_available" msgid="4728975345815214218">"Даступны слоўнік"</string>
-    <string name="dictionary_downloading" msgid="2982650524622620983">"Спампоўваецца зараз"</string>
-    <string name="dictionary_installed" msgid="8081558343559342962">"Усталявана"</string>
-    <string name="dictionary_disabled" msgid="8950383219564621762">"Усталявана, адключана"</string>
-    <string name="cannot_connect_to_dict_service" msgid="9216933695765732398">"Праблема падключэння да слоўніка"</string>
-    <string name="no_dictionaries_available" msgid="8039920716566132611">"Слоўнікаў няма"</string>
-    <string name="check_for_updates_now" msgid="8087688440916388581">"Абнавіць"</string>
-    <string name="last_update" msgid="730467549913588780">"Апошняе абнаўленне"</string>
-    <string name="message_updating" msgid="4457761393932375219">"Праверка наяўнасці абнаўленняў"</string>
-    <string name="message_loading" msgid="8689096636874758814">"Загрузка..."</string>
-    <string name="main_dict_description" msgid="3072821352793492143">"Асноўны слоўнік"</string>
-    <string name="cancel" msgid="6830980399865683324">"Адмяніць"</string>
-    <string name="install_dict" msgid="180852772562189365">"Усталяваць"</string>
-    <string name="cancel_download_dict" msgid="7843340278507019303">"Адмена"</string>
-    <string name="delete_dict" msgid="756853268088330054">"Выдаліць"</string>
-    <string name="should_download_over_metered_prompt" msgid="2878629598667658845">"Для выбранай мовы на мабільнай прыладзе ёсць слоўнік.&lt;br/&gt; Мы рэкамендуем &lt;b&gt;спампаваць&lt;/b&gt; слоўнік для мовы \"<xliff:g id="LANGUAGE">%1$s</xliff:g>\" для паляпшэння зручнасці набору.&lt;br/&gt; &lt;br/&gt; Спампоўка можа заняць хвіліну або дзве ў 3G-сетках. Калі ў вас няма &lt;b&gt;безлімітнага тарыфнага плану перадачы дадзеных&lt;/b&gt;, могуць прымяняцца дадатковыя плацяжы&lt;br/&gt;. Калі вы не ведаеце дакладна, які ў вас тарыфны план, мы рэкамендуем знайсці падлучэнне да сеткі Wi-Fi, каб пачаць аўтаматычную спампоўку.&lt;br/&gt; &lt;br/&gt; Парада: можна спампоўваць і выдаляць слоўнікі, перайшоўшы ў раздзел &lt;b&gt;Мова і ўвод&lt;/b&gt; у меню &lt;b&gt;Налады&lt;/b&gt; вашай мабільнай прылады."</string>
-    <string name="download_over_metered" msgid="1643065851159409546">"Спампаваць зараз (<xliff:g id="SIZE_IN_MEGABYTES">%1$.1f</xliff:g>МБ)"</string>
-    <string name="do_not_download_over_metered" msgid="2176209579313941583">"Спампаваць праз Wi-Fi"</string>
-    <string name="dict_available_notification_title" msgid="6514288591959117288">"Слоўнік для мовы \"<xliff:g id="LANGUAGE">%1$s</xliff:g>\""</string>
-    <string name="dict_available_notification_description" msgid="1075194169443163487">"Нацiснiце, каб прагледзець i спампаваць"</string>
-    <string name="toast_downloading_suggestions" msgid="1313027353588566660">"Загрузка: прапановы для мовы \"<xliff:g id="LANGUAGE">%1$s</xliff:g>\" хутка з\'явяцца."</string>
-    <string name="version_text" msgid="2715354215568469385">"Версія <xliff:g id="VERSION_NUMBER">%1$s</xliff:g>"</string>
-    <string name="user_dict_settings_add_menu_title" msgid="1254195365689387076">"Дадаць"</string>
-    <string name="user_dict_settings_add_dialog_title" msgid="4096700390211748168">"Дадаць у слоўнік"</string>
-    <string name="user_dict_settings_add_screen_title" msgid="5818914331629278758">"Выраз"</string>
-    <string name="user_dict_settings_add_dialog_more_options" msgid="5671682004887093112">"Дадатковыя параметры"</string>
-    <string name="user_dict_settings_add_dialog_less_options" msgid="2716586567241724126">"Асн. параметры"</string>
-    <string name="user_dict_settings_add_dialog_confirm" msgid="4703129507388332950">"OК"</string>
-    <string name="user_dict_settings_add_word_option_name" msgid="6665558053408962865">"Слова:"</string>
-    <string name="user_dict_settings_add_shortcut_option_name" msgid="3094731590655523777">"Шлях хуткага доступу:"</string>
-    <string name="user_dict_settings_add_locale_option_name" msgid="4738643440987277705">"Мова:"</string>
-    <string name="user_dict_settings_add_word_hint" msgid="4902434148985906707">"Увядзіце слова"</string>
-    <string name="user_dict_settings_add_shortcut_hint" msgid="2265453012555060178">"Дадатковы цэтлiк"</string>
-    <string name="user_dict_settings_edit_dialog_title" msgid="3765774633869590352">"Рэдагаваць слова"</string>
-    <string name="user_dict_settings_context_menu_edit_title" msgid="6812255903472456302">"Рэдагаваць"</string>
-    <string name="user_dict_settings_context_menu_delete_title" msgid="8142932447689461181">"Выдаліць"</string>
-    <string name="user_dict_settings_empty_text" msgid="558499587532668203">"У вашым карыстальніцкім слоўніку няма ніводнага слова. Вы можаце дадаваць словы, дакранаючыся да кнопкі \"+\" у пункце меню \"Дадаць\"."</string>
-    <string name="user_dict_settings_all_languages" msgid="8276126583216298886">"Для ўсіх моў"</string>
-    <string name="user_dict_settings_more_languages" msgid="7131268499685180461">"Іншыя мовы..."</string>
-    <string name="user_dict_settings_delete" msgid="110413335187193859">"Выдаліць"</string>
-    <string name="user_dict_fast_scroll_alphabet" msgid="5431919401558285473">" ABCDEFGHIJKLMNOPQRSTUVWXYZ"</string>
-</resources>
diff --git a/java/res/values-bg/strings.xml b/java/res/values-bg/strings.xml
index c3fbd79..d4a1d91 100644
--- a/java/res/values-bg/strings.xml
+++ b/java/res/values-bg/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Станд. за системата"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Предложения за контакти"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Използване на имена от „Контакти“ за предложения и поправки"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Персонализ. предложения"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Ползване на съобщ. ви и въведени от вас данни за подобряване на предложенията"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Точка чрез двоен интервал"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Двукр. докосване на клав. за интервал вмъква точка, следвана от интервал"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Автоматично поставяне на главни букви"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"часа"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL адреси"</string>
     <string name="voice_input" msgid="3583258583521397548">"Клавиш за гласово въвеждане"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"На осн. клавиатура"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"На клав. на симв."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Изкл."</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Микр. на осн. клав."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Микр. на клав. на симв."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Глас. въвежд. е деакт."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Конфигуриране на въвеждането"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Входни езици"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Изпращане на отзиви"</string>
diff --git a/java/res/values-ca/strings.xml b/java/res/values-ca/strings.xml
index 0b9ee03..21dd7d5 100644
--- a/java/res/values-ca/strings.xml
+++ b/java/res/values-ca/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Predeterm. del sist."</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Suggereix noms de contactes"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Utilitza els noms de contactes per fer suggeriments i correccions"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Suggeriments personalitz."</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Considera comunicacions i dades introduïdes per millorar sugger."</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Punt amb doble espai"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Picar dues vegades la barra d\'espai insereix punt i espai blanc"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Majúscules automàtiques"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"hora"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tecla d\'entrada de veu"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Al teclat principal"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Al teclat de símbols"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Desactivada"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Micròfon al teclat principal"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Micro en tecl. símb."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Entrada de veu desactivada"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configura mètodes d\'entrada"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Idiomes"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Envia comentaris"</string>
diff --git a/java/res/values-cs/strings.xml b/java/res/values-cs/strings.xml
index c73e8ab..8140615 100644
--- a/java/res/values-cs/strings.xml
+++ b/java/res/values-cs/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Výchozí nastavení"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Navrhovat jména kontaktů"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Použít jména ze seznamu kontaktů k návrhům a opravám"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Personalizované návrhy"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Zlepšovat návrhy na základě vaší komunikace a zadaných dat"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Tečka dvojitým mezerníkem"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dvojím klepnutím na mezerník vložíte tečku následovanou mezerou."</string>
     <string name="auto_cap" msgid="1719746674854628252">"Velká písmena automaticky"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"čas"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"adresy URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Klávesa hlasového vstupu"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Na hlavní klávesnici"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Na klávesnici se symboly"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Vypnuto"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofon na hlavní klávesnici"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikrofon na klávesnici se symboly"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Hlasový vstup vypnut"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigurace metod zadávání"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Vstupní jazyky"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Odeslat zpětnou vazbu"</string>
diff --git a/java/res/values-da/strings.xml b/java/res/values-da/strings.xml
index 86bdad4..b7f75b3 100644
--- a/java/res/values-da/strings.xml
+++ b/java/res/values-da/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Systemstandard"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Foreslå navne på kontakter"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Brug navne fra Kontaktpersoner til forslag og rettelser"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Tilpassede forslag"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Giv bedre forslag ud fra tidligere kommunikation og data"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"To mellemrum for punktum"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"To tryk på mellemrumstasten indsætter et punktum og et mellemrum"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Skriv aut. med stort"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"klokkeslæt"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"Webadresse"</string>
     <string name="voice_input" msgid="3583258583521397548">"Nøgle til stemmeinput"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"På hovedtastatur"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"På symboltastatur"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Fra"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mik. på hovedtastatur"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mik. på symboltastatur"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Stemmeinput deaktiveret"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigurer inputmetoder"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Inputsprog"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Send feedback"</string>
diff --git a/java/res/values-de/strings.xml b/java/res/values-de/strings.xml
index b650534..178db3c 100644
--- a/java/res/values-de/strings.xml
+++ b/java/res/values-de/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Systemstandardeinstellung"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Kontakte vorschlagen"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Namen aus \"Kontakte\" als Vorschläge und Korrekturmöglichkeiten anzeigen"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Personalisierte Vorschläge"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Vorschläge anhand bisheriger Nachrichten und Eingaben verbessern"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Punkt plus Leerzeichen"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Für Punkt plus Leerzeichen zweimal auf die Leertaste tippen﻿﻿"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Autom. Groß-/Kleinschreibung"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"Zeit"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Taste für Spracheingabe"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Auf Haupttastatur"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Auf Symboltastatur"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Aus"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikro auf Haupttastatur"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikro auf Symboltastatur"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Spracheingabe deaktiviert"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Eingabemethoden konfigurieren"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Eingabesprachen"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Feedback geben"</string>
diff --git a/java/res/values-el/strings.xml b/java/res/values-el/strings.xml
index 79e8342..6875f68 100644
--- a/java/res/values-el/strings.xml
+++ b/java/res/values-el/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Προεπιλογή"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Πρόταση ονομάτων επαφών"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Χρησιμοποιήστε ονόματα από τις Επαφές για προτάσεις και διορθ."</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Εξατομικευμένες προτάσεις"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Χρήση επικοινωνιών/δεδομένων πληκτρολόγησης για βελτίωση προτάσεων"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Τελεία με διπλό πάτημα πλήκτρ.διαστ."</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Το διπλό πάτημα του πλήκτρ.διαστ. εισάγει μια τελεία και ένα κενό"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Αυτόματη χρήση κεφαλαίων"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ώρα"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"διεύθυνση URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Κλειδί φωνητικής εξόδου"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Στο κύριο πληκτρολ."</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Πληκτρ. συμβ. ενερ."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Απενεργοποίηση"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Μικ. στο κύριο πληκ."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Μικ. στο πληκ. συμβ."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Απεν. φωνητ. είσοδος"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Διαμόρφωση μεθόδων εισαγωγής"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Γλώσσες εισόδου"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Αποστολή σχολίων"</string>
diff --git a/java/res/values-en-rGB/strings.xml b/java/res/values-en-rGB/strings.xml
index 4bc1b15..7e5e0e1 100644
--- a/java/res/values-en-rGB/strings.xml
+++ b/java/res/values-en-rGB/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"System default"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Suggest Contact names"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Use names from Contacts for suggestions and corrections"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Personalised suggestions"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Learn from your communications and typed data to improve suggestions"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Double-space full stop"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Double tap on spacebar inserts a full stop followed by a space"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Auto-capitalisation"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"time"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Voice input key"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"On main keyboard"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"On symbols keyboard"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Off"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mic on main keyboard"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mic on symbols keyboard"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Voice input is disabled"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configure input methods"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Input languages"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Send feedback"</string>
diff --git a/java/res/values-en-rIN/strings.xml b/java/res/values-en-rIN/strings.xml
index 4bc1b15..7e5e0e1 100644
--- a/java/res/values-en-rIN/strings.xml
+++ b/java/res/values-en-rIN/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"System default"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Suggest Contact names"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Use names from Contacts for suggestions and corrections"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Personalised suggestions"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Learn from your communications and typed data to improve suggestions"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Double-space full stop"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Double tap on spacebar inserts a full stop followed by a space"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Auto-capitalisation"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"time"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Voice input key"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"On main keyboard"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"On symbols keyboard"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Off"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mic on main keyboard"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mic on symbols keyboard"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Voice input is disabled"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configure input methods"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Input languages"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Send feedback"</string>
diff --git a/java/res/values-es-rUS/strings.xml b/java/res/values-es-rUS/strings.xml
index 1fd9cf8..0cbadc3 100644
--- a/java/res/values-es-rUS/strings.xml
+++ b/java/res/values-es-rUS/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Valor predet. sist."</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Sugerir nombres de contacto"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Usar nombres de los contactos para sugerencias y correcciones"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Sugerenc. personalizadas"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Aprende de mensajes y datos ingresados para mejorar sugerencias."</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Punto y doble espacio"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Tocar dos veces la barra espaciadora inserta un punto y espacio."</string>
     <string name="auto_cap" msgid="1719746674854628252">"Mayúsculas automáticas"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"hora"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tecla de entrada por voz"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"En el teclado principal"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"En el teclado de símbolos"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Desactivado"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Micrófono en el teclado principal"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Micrófono en el teclado de símbolos"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"La entrada por voz está inhabilitada"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configurar métodos de entrada"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Idiomas de entrada"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Enviar comentarios"</string>
diff --git a/java/res/values-es/strings.xml b/java/res/values-es/strings.xml
index 39b45e0..cfcb988 100644
--- a/java/res/values-es/strings.xml
+++ b/java/res/values-es/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Predeterminado"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Sugerir contactos"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Utilizar nombres de contactos para sugerencias y correcciones"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Sugerencias personalizadas"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Aprende de mensajes y datos escritos para mejorar sugerencias"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Punto y espacio"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Si tocas dos veces el espacio, se inserta un punto seguido de un espacio"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Mayúsculas automáticas"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"hora"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tecla de entrada de voz"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"En teclado principal"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"En teclado de símbolos"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"No"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Micrófono en teclado principal"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Micrófono en teclado de símbolos"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Entrada de voz inhabilitada"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configurar métodos de entrada"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Idiomas"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Danos tu opinión"</string>
diff --git a/java/res/values-et-rEE/strings.xml b/java/res/values-et-rEE/strings.xml
index e0f992c..68be2f2 100644
--- a/java/res/values-et-rEE/strings.xml
+++ b/java/res/values-et-rEE/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Süsteemi vaikeväärt."</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Soovita kontaktkirjeid"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Kasuta soovitusteks ja parandusteks nimesid kontaktiloendist"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Isikupärast. soovitused"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Suhtlusest ja sisest. andmetest õppimine soovituste täiustamiseks"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Punkt tühikuklahviga"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Tühikuklahvi kaks korda puudutades sisestatakse punkt ja tühik"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Automaatne suurtähtede kasutamine"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"aeg"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Häälesisendi klahv"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Peamisel klaviatuuril"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Sümbolite klaviatuuril"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Väljas"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofon peamisel klaviatuuril"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikr. sümb. klaviat."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Kõnesisend on keelatud"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Sisestusmeetodite seadistamine"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Sisestuskeeled"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Saatke tagasisidet"</string>
diff --git a/java/res/values-ar/donottranslate.xml b/java/res/values-fa/config-spacing-and-punctuations.xml
similarity index 89%
copy from java/res/values-ar/donottranslate.xml
copy to java/res/values-fa/config-spacing-and-punctuations.xml
index 57de253..9e637e4 100644
--- a/java/res/values-ar/donottranslate.xml
+++ b/java/res/values-fa/config-spacing-and-punctuations.xml
@@ -21,5 +21,5 @@
     <!-- The all letters need to be mirrored are found at
          http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt -->
     <!-- Symbols that are suggested between words -->
-    <string name="suggested_punctuations">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
+    <string name="suggested_punctuations" translatable="false">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
 </resources>
diff --git a/java/res/values-fa/donottranslate.xml b/java/res/values-fa/donottranslate.xml
deleted file mode 100644
index 57de253..0000000
--- a/java/res/values-fa/donottranslate.xml
+++ /dev/null
@@ -1,25 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2012, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <!-- The all letters need to be mirrored are found at
-         http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt -->
-    <!-- Symbols that are suggested between words -->
-    <string name="suggested_punctuations">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
-</resources>
diff --git a/java/res/values-fa/strings.xml b/java/res/values-fa/strings.xml
index af886ef..18c8222 100644
--- a/java/res/values-fa/strings.xml
+++ b/java/res/values-fa/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"پیش‌فرض سیستم"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"پیشنهاد نام‌های مخاطب"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"برای پیشنهاد و تصحیح از نام مخاطبین استفاده شود"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"پیشنهادات شخصی شده"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"یادگیری از ارتباطات و اطلاعات تایپ شده شما برای بهبود پیشنهادات"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"نقطه با دو فاصله"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"با دوبار ضربه روی دکمه فاصله نقطه با یک فاصله بعد آن درج می‌شود"</string>
     <string name="auto_cap" msgid="1719746674854628252">"بزرگ‌کردن خودکار حروف"</string>
@@ -121,12 +123,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"زمان"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"نشانی اینترنتی"</string>
     <string name="voice_input" msgid="3583258583521397548">"کلید ورودی صدا"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"در صفحه‌کلید اصلی"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"در صفحه‌کلید نمادها"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"خاموش"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"میکروفن در صفحه‌کلید اصلی"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"میکروفن در صفحه‌کلید نمادها"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"ورودی صدا غیرفعال است"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"پیکربندی روش‌های ورودی"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"زبان‌های ورودی"</string>
     <string name="send_feedback" msgid="1780431884109392046">"ارسال بازخورد"</string>
diff --git a/java/res/values-fi/strings.xml b/java/res/values-fi/strings.xml
index a58bfac..2e4a2c7 100644
--- a/java/res/values-fi/strings.xml
+++ b/java/res/values-fi/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Järjestelmän oletusarvo"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Ehdota yht.tietojen nimiä"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Käytä yhteystietojen nimiä ehdotuksissa ja korjauksissa"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Räätälöidyt ehdotukset"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Ehdotusten parannus viestinnän ja kirjoitettujen tietojen avulla"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Kaksoisvälilyönti = piste"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Välilyönnin kaksoisnapautus lisää tekstiin pisteen ja välilyönnin"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Automaattiset isot kirjaimet"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"aika"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL-osoite"</string>
     <string name="voice_input" msgid="3583258583521397548">"Äänisyöteavain"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Päänäppäimistössä"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Symbolinäppäim."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Ei käytössä"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikr. päänäppäim."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikr. symbolinäpp."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Äänisyöte ei käyt."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Määritä syöttötavat"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Syöttökielet"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Lähetä palautetta"</string>
diff --git a/java/res/values-fr-rCA/donottranslate.xml b/java/res/values-fr-rCA/config-spacing-and-punctuations.xml
similarity index 77%
rename from java/res/values-fr-rCA/donottranslate.xml
rename to java/res/values-fr-rCA/config-spacing-and-punctuations.xml
index 21f18d8..0625480 100644
--- a/java/res/values-fr-rCA/donottranslate.xml
+++ b/java/res/values-fr-rCA/config-spacing-and-punctuations.xml
@@ -20,12 +20,12 @@
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
     <!-- Symbols that are normally preceded by a space (used to add an auto-space before these) -->
     <!-- This is similar to French with the exception of "!" "?" and ";" which do not take a space before in Canadian French. Note that ":" does take a space before according to Canadian rules. -->
-    <string name="symbols_preceded_by_space">([{&amp;:</string>
+    <string name="symbols_preceded_by_space" translatable="false">([{&amp;:</string>
     <!-- Symbols that are normally followed by a space (used to add an auto-space after these) -->
-    <string name="symbols_followed_by_space">.,;:!?)]}&amp;</string>
+    <string name="symbols_followed_by_space" translatable="false">.,;:!?)]}&amp;</string>
     <!-- Symbols that separate words -->
     <!-- Don't remove the enclosing double quotes, they protect whitespace (not just U+0020) -->
-    <string name="symbols_word_separators">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"</string>
+    <string name="symbols_word_separators" translatable="false">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"</string>
     <!-- Word connectors -->
-    <string name="symbols_word_connectors">\'-</string>
+    <string name="symbols_word_connectors" translatable="false">\'-</string>
 </resources>
diff --git a/java/res/values-fr-rCA/strings.xml b/java/res/values-fr-rCA/strings.xml
index 2551ce9..1427202 100644
--- a/java/res/values-fr-rCA/strings.xml
+++ b/java/res/values-fr-rCA/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Paramètres par défaut"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Proposer noms de contacts"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Utiliser des noms de contacts pour les suggestions et corrections"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Suggestions personnalisées"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Apprendre de vos comm. et données entrées pour amél. suggestions"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Point et espace"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Appuyez deux fois sur la barre d\'espace pour insérer un point et une espace"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Majuscules automatiques"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"Heure"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Touche de saisie vocale"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Sur le clavier principal"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Sur clavier symboles"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Désactiver"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Micro sur le clavier principal"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Micro sur le clavier des symboles"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Saisie vocale désactivée"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configurer les modes de saisie"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Langues de saisie"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Envoyer des commentaires"</string>
diff --git a/java/res/values-fr/donottranslate.xml b/java/res/values-fr/config-spacing-and-punctuations.xml
similarity index 74%
rename from java/res/values-fr/donottranslate.xml
rename to java/res/values-fr/config-spacing-and-punctuations.xml
index f064411..33e0236 100644
--- a/java/res/values-fr/donottranslate.xml
+++ b/java/res/values-fr/config-spacing-and-punctuations.xml
@@ -19,12 +19,12 @@
 -->
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
     <!-- Symbols that are normally preceded by a space (used to add an auto-space before these) -->
-    <string name="symbols_preceded_by_space">([{&amp;;:!?</string>
+    <string name="symbols_preceded_by_space" translatable="false">([{&amp;;:!?</string>
     <!-- Symbols that are normally followed by a space (used to add an auto-space after these) -->
-    <string name="symbols_followed_by_space">.,;:!?)]}&amp;</string>
+    <string name="symbols_followed_by_space" translatable="false">.,;:!?)]}&amp;</string>
     <!-- Symbols that separate words -->
     <!-- Don't remove the enclosing double quotes, they protect whitespace (not just U+0020) -->
-    <string name="symbols_word_separators">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"</string>
+    <string name="symbols_word_separators" translatable="false">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"</string>
     <!-- Word connectors -->
-    <string name="symbols_word_connectors">\'-</string>
+    <string name="symbols_word_connectors" translatable="false">\'-</string>
 </resources>
diff --git a/java/res/values-fr/strings.xml b/java/res/values-fr/strings.xml
index b877db0..43242e4 100644
--- a/java/res/values-fr/strings.xml
+++ b/java/res/values-fr/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Paramètres par défaut"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Proposer noms de contacts"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Utiliser des noms de contacts pour les suggestions et corrections"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Suggestions personnalisées"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Améliorer suggestions en fonction des messages et données saisies"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Point et espace"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Appuyez deux fois sur la barre d\'espace pour insérer un point et un espace."</string>
     <string name="auto_cap" msgid="1719746674854628252">"Majuscules auto"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"Heure"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Touche de saisie vocale"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Sur clavier principal"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Sur clavier symboles"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Désactiver"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Micro sur le clavier principal"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Micro sur clavier symboles"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Saisie vocale désactivée"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configurer les modes de saisie"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Langues de saisie"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Envoyer des commentaires"</string>
diff --git a/java/res/values-h1200dp-port/setup-dimens-large-tablet-port.xml b/java/res/values-h1200dp-port/setup-dimens-large-tablet-port.xml
index bc7928d..adc3e35 100644
--- a/java/res/values-h1200dp-port/setup-dimens-large-tablet-port.xml
+++ b/java/res/values-h1200dp-port/setup-dimens-large-tablet-port.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">38sp</dimen>
     <dimen name="setup_step_bullet_text_size">24sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">24dp</dimen>
-    <dimen name="setup_step_indicator_height">24dp</dimen>
     <dimen name="setup_step_title_text_size">24sp</dimen>
     <dimen name="setup_step_instruction_text_size">18sp</dimen>
     <dimen name="setup_step_action_text_size">20sp</dimen>
diff --git a/java/res/values-h330dp-land/setup-dimens-large-phone-land.xml b/java/res/values-h330dp-land/setup-dimens-large-phone-land.xml
index aebf6d2..1ff43ff 100644
--- a/java/res/values-h330dp-land/setup-dimens-large-phone-land.xml
+++ b/java/res/values-h330dp-land/setup-dimens-large-phone-land.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">22sp</dimen>
     <dimen name="setup_step_bullet_text_size">22sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">24dp</dimen>
-    <dimen name="setup_step_indicator_height">24dp</dimen>
     <dimen name="setup_step_title_text_size">20sp</dimen>
     <dimen name="setup_step_instruction_text_size">16sp</dimen>
     <dimen name="setup_step_action_text_size">18sp</dimen>
diff --git a/java/res/values-h520dp-land/setup-dimens-small-tablet-land.xml b/java/res/values-h520dp-land/setup-dimens-small-tablet-land.xml
index aedf79f..a0e30cd 100644
--- a/java/res/values-h520dp-land/setup-dimens-small-tablet-land.xml
+++ b/java/res/values-h520dp-land/setup-dimens-small-tablet-land.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">32sp</dimen>
     <dimen name="setup_step_bullet_text_size">24sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">24dp</dimen>
-    <dimen name="setup_step_indicator_height">24dp</dimen>
     <dimen name="setup_step_title_text_size">24sp</dimen>
     <dimen name="setup_step_instruction_text_size">18sp</dimen>
     <dimen name="setup_step_action_text_size">20sp</dimen>
diff --git a/java/res/values-h540dp-port/setup-dimens-large-phone-port.xml b/java/res/values-h540dp-port/setup-dimens-large-phone-port.xml
index 6d66f46..cf2a10a 100644
--- a/java/res/values-h540dp-port/setup-dimens-large-phone-port.xml
+++ b/java/res/values-h540dp-port/setup-dimens-large-phone-port.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">26sp</dimen>
     <dimen name="setup_step_bullet_text_size">22sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">24dp</dimen>
-    <dimen name="setup_step_indicator_height">24dp</dimen>
     <dimen name="setup_step_title_text_size">20sp</dimen>
     <dimen name="setup_step_instruction_text_size">16sp</dimen>
     <dimen name="setup_step_action_text_size">18sp</dimen>
diff --git a/java/res/values-h720dp-land/setup-dimens-large-tablet-land.xml b/java/res/values-h720dp-land/setup-dimens-large-tablet-land.xml
index e22b741..a782ef8 100644
--- a/java/res/values-h720dp-land/setup-dimens-large-tablet-land.xml
+++ b/java/res/values-h720dp-land/setup-dimens-large-tablet-land.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">38sp</dimen>
     <dimen name="setup_step_bullet_text_size">24sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">24dp</dimen>
-    <dimen name="setup_step_indicator_height">24dp</dimen>
     <dimen name="setup_step_title_text_size">24sp</dimen>
     <dimen name="setup_step_instruction_text_size">18sp</dimen>
     <dimen name="setup_step_action_text_size">20sp</dimen>
diff --git a/java/res/values-h800dp-port/setup-dimens-small-tablet-port.xml b/java/res/values-h800dp-port/setup-dimens-small-tablet-port.xml
index 86cf3a0..9ac0f11 100644
--- a/java/res/values-h800dp-port/setup-dimens-small-tablet-port.xml
+++ b/java/res/values-h800dp-port/setup-dimens-small-tablet-port.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">36sp</dimen>
     <dimen name="setup_step_bullet_text_size">24sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">24dp</dimen>
-    <dimen name="setup_step_indicator_height">24dp</dimen>
     <dimen name="setup_step_title_text_size">24sp</dimen>
     <dimen name="setup_step_instruction_text_size">18sp</dimen>
     <dimen name="setup_step_action_text_size">20sp</dimen>
diff --git a/java/res/values-hdpi/config.xml b/java/res/values-hdpi/config.xml
deleted file mode 100644
index 4cf3562..0000000
--- a/java/res/values-hdpi/config.xml
+++ /dev/null
@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2011, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<resources>
-    <!--  Screen metrics for logging.
-            0 = "mdpi phone screen"
-            1 = "hdpi phone screen"
-            2 = "mdpi 11 inch tablet screen"
-            3 = "xhdpi phone screen?"
-            4 = ?
-    -->
-    <integer name="log_screen_metrics">1</integer>
-</resources>
diff --git a/java/res/values-hi/strings.xml b/java/res/values-hi/strings.xml
index d773543..7336156 100644
--- a/java/res/values-hi/strings.xml
+++ b/java/res/values-hi/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"सिस्टम डिफ़ॉल्ट"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"संपर्क नाम सुझाएं"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"सुझाव और सुधार के लिए संपर्क से नामों का उपयोग करें"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"वैयक्तिकृत सुझाव"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"सुझावों में सुधार हेतु अपने संचार और लिखे गए डेटा से जानकारी पाएं"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"दोहरे स्पेस वाला पीरियड"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"स्पेसबार पर डबल टैप करने से पीरियड शामिल हो जाता है जिसके बाद एक रिक्ति होती है"</string>
     <string name="auto_cap" msgid="1719746674854628252">"स्‍वत: अक्षर बड़े करना"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"समय"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"ध्‍वनि‍ इनपुट कुंजी"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"मुख्‍य कीबोर्ड पर"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"प्रतीक कीबोर्ड पर"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"बंद"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"मुख्‍य कीबोर्ड पर माइक"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"प्रतीक कीबोर्ड पर माइक"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"ध्‍वनि इनपुट अक्षम है"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"इनपुट पद्धति कॉन्‍फ़िगर करें"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"इनपुट भाषा"</string>
     <string name="send_feedback" msgid="1780431884109392046">"सुझाव भेजें"</string>
diff --git a/java/res/values-hr/strings.xml b/java/res/values-hr/strings.xml
index b9cfef3..1afe99e 100644
--- a/java/res/values-hr/strings.xml
+++ b/java/res/values-hr/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Zadano sustavom"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Predlaži imena kontakata"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Upotreba imena iz Kontakata za prijedloge i ispravke"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Prilagođeni prijedlozi"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Upotrijebi poruke i upisane podatke za poboljšanje prijedloga"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Točka s dva razmaka"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dvostrukim dodirivanjem razmaknice umeću se točka i razmak"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Automatsko pisanje velikih slova"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"vrijeme"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tipka za glasovni unos"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Na glavnoj tipkovnici"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Na tipkovnici simb."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Isključeno"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofon na gl. tipkovnici"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mik. na tipk. simb."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Glas. unos onemog."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfiguriraj načine ulaza"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Jezici unosa"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Slanje povratnih informacija"</string>
diff --git a/java/res/values-hu/strings.xml b/java/res/values-hu/strings.xml
index a61378f..8ed477a 100644
--- a/java/res/values-hu/strings.xml
+++ b/java/res/values-hu/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Alapértelmezett"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Javasolt névjegyek"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"A névjegyek használata a javaslatokhoz és javításokhoz"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Testreszabott javaslatok"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Javaslatok javítása a kommunikáció és begépelt adatok alapján"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Dupla szóköz: pont"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"A szóköz kétszeri megérintése beszúr egy pontot, majd egy szóközt"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Automatikusan nagy kezdőbetű"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"idő"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Hangbeviteli gomb"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"A fő billentyűzeten"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Szimbólumoknál"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Ki"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofon a billentyűzeten"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikr. a szimbólumoknál"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Hangbevivel KI"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Beviteli módok beállítása"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Beviteli nyelvek"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Visszajelzés küldése"</string>
diff --git a/java/res/values-hy-rAM/donottranslate.xml b/java/res/values-hy-rAM/config-spacing-and-punctuations.xml
similarity index 79%
rename from java/res/values-hy-rAM/donottranslate.xml
rename to java/res/values-hy-rAM/config-spacing-and-punctuations.xml
index 7b0c566..f26a30d 100644
--- a/java/res/values-hy-rAM/donottranslate.xml
+++ b/java/res/values-hy-rAM/config-spacing-and-punctuations.xml
@@ -22,11 +22,11 @@
     <!-- U+055D: "՝" ARMENIAN COMMA -->
     <!-- U+0589: "։" ARMENIAN FULL STOP -->
     <!-- Symbols that are normally followed by a space (used to add an auto-space after these) -->
-    <string name="symbols_followed_by_space">.,;:!?)]}&amp;&#x0589;&#x055D;</string>
+    <string name="symbols_followed_by_space" translatable="false">.,;:!?)]}&amp;&#x0589;&#x055D;</string>
     <!-- Symbols that separate words. Adding armenian period and comma. -->
     <!-- Don't remove the enclosing double quotes, they protect whitespace (not just U+0020) -->
-    <string name="symbols_word_separators">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"&#x0589;&#x055D;</string>
+    <string name="symbols_word_separators" translatable="false">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"&#x0589;&#x055D;</string>
     <!-- The sentence separator code point, for capitalization -->
     <!-- U+0589: "։" ARMENIAN FULL STOP   ; 589h = 1417d -->
-    <integer name="sentence_separator">1417</integer>
+    <integer name="sentence_separator" translatable="false">1417</integer>
 </resources>
diff --git a/java/res/values-hy-rAM/strings.xml b/java/res/values-hy-rAM/strings.xml
index 0b8e19a..68d44fb 100644
--- a/java/res/values-hy-rAM/strings.xml
+++ b/java/res/values-hy-rAM/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Համակարգի լռելյայնները"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Առաջարկել կոնտակտների անունները"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Օգտագործել կոնտակտների անունները՝ առաջարկների և ուղղումների համար"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Անհատականացված առաջարկներ"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Բարելավեք առաջարկները` ձեր զրույցներից և մուտքագրած տվյալներից"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Կրկնաբացակի վերջակետ"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Բացակի ստեղնի կրկնակի հպումը բացակից հետո վերջակետ է դնում"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Ավտոմատ գլխատառացում"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ժամանակ"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Ձայնային մուտքագրման ստեղն"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Հիմնական ստեղնաշարի վրա"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Նշանների ստեղնաշարի վրա"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Անջատված"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Բարձրախոս հիմնական ստեղնաշարի վրա"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Բարձրախոս նշանների ստեղնաշարի վրա"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Ձայնային մուտքագրումն անջատված է"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Կարգավորել մուտքագրման մեթոդները"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Մուտքագրման լեզուներ"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Արձագանքել"</string>
diff --git a/java/res/values-in/strings.xml b/java/res/values-in/strings.xml
index d83a22c..6957700 100644
--- a/java/res/values-in/strings.xml
+++ b/java/res/values-in/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Default sistem"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Sarankan nama Kontak"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Menggunakan nama dari Kontak untuk saran dan koreksi"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Saran hasil personalisasi"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Belajar dari komunikasi &amp; data terketik untuk meningkatkan saran"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Titik spasi ganda"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Mengetuk tombol spasi dua kali akan memasukkan titik diikuti satu spasi"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Kapitalisasi otomatis"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"waktu"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tombol masukan suara"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Pada keyboard utama"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Pada keyboard simbol"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Mati"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mik pada keyboard utama"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mik pada keyboard simbol"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Masukan suara dinonaktifkan"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigurasikan metode masukan"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Bahasa masukan"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Kirim masukan"</string>
diff --git a/java/res/values-is/strings.xml b/java/res/values-is/strings.xml
index 6f685d3..1137fd0 100644
--- a/java/res/values-is/strings.xml
+++ b/java/res/values-is/strings.xml
@@ -214,18 +214,6 @@
     <skip />
     <!-- no translation found for voice_input (3583258583521397548) -->
     <skip />
-    <!-- no translation found for voice_input_modes_main_keyboard (3360660341121083174) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_symbols_keyboard (7203213240786084067) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_off (3745699748218082014) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_main_keyboard (6586544292900314339) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_symbols_keyboard (5233725927281932391) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_off (63875609591897607) -->
-    <skip />
     <!-- no translation found for configure_input_method (373356270290742459) -->
     <skip />
     <!-- no translation found for language_selection_title (1651299598555326750) -->
diff --git a/java/res/values-it/strings.xml b/java/res/values-it/strings.xml
index 1111c49..12f5004 100644
--- a/java/res/values-it/strings.xml
+++ b/java/res/values-it/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Predefinito sistema"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Suggerisci nomi di contatti"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Utilizza nomi di Contatti per suggerimenti e correzioni"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Suggerimenti personalizz."</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Usa comunicazioni e dati digitati per migliorare i suggerimenti"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Doppio spazio per punto"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Tocca due volte barra spaziatr. per inserire punto seguito da spazio"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Maiuscole automatiche"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ora"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tasto input vocale"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Su tastiera principale"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Su tastiera simboli"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"OFF"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Microfono su tastiera principale"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Microfono su tastiera simboli"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Input vocale disatt."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configura metodi di immissione"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Lingue comandi"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Invia feedback"</string>
diff --git a/java/res/values-ar/donottranslate.xml b/java/res/values-iw/config-spacing-and-punctuations.xml
similarity index 89%
copy from java/res/values-ar/donottranslate.xml
copy to java/res/values-iw/config-spacing-and-punctuations.xml
index 57de253..9e637e4 100644
--- a/java/res/values-ar/donottranslate.xml
+++ b/java/res/values-iw/config-spacing-and-punctuations.xml
@@ -21,5 +21,5 @@
     <!-- The all letters need to be mirrored are found at
          http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt -->
     <!-- Symbols that are suggested between words -->
-    <string name="suggested_punctuations">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
+    <string name="suggested_punctuations" translatable="false">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
 </resources>
diff --git a/java/res/values-iw/donottranslate.xml b/java/res/values-iw/donottranslate.xml
deleted file mode 100644
index 57de253..0000000
--- a/java/res/values-iw/donottranslate.xml
+++ /dev/null
@@ -1,25 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2012, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <!-- The all letters need to be mirrored are found at
-         http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt -->
-    <!-- Symbols that are suggested between words -->
-    <string name="suggested_punctuations">!,?,\\,,:,;,\",(|),)|(,\',-,/,@,_</string>
-</resources>
diff --git a/java/res/values-iw/strings.xml b/java/res/values-iw/strings.xml
index 8d02e68..0604eb7 100644
--- a/java/res/values-iw/strings.xml
+++ b/java/res/values-iw/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"ברירת מחדל של המערכת"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"הצע שמות של אנשי קשר"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"השתמש בשמות מרשימת אנשי הקשר עבור הצעות ותיקונים"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"הצעות מותאמות אישית"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"למד מהתכתבויות ומנתונים שהקלדת כדי לשפר את ההצעות"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"רווח כפול לנקודה"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"הקשה פעמיים על מקש הרווח מזינה נקודה ואחריה רווח"</string>
     <string name="auto_cap" msgid="1719746674854628252">"הפיכת אותיות לרישיות באופן אוטומטי"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"זמן"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"כתובות אתרים"</string>
     <string name="voice_input" msgid="3583258583521397548">"מקש קלט קולי"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"במקלדת הראשית"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"במקלדת סמלים"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"כבוי"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"מיקרופון במקלדת הראשית"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"מיקרופון במקלדת סמלים"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"הקלט הקולי מושבת"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"הגדרת שיטות קלט"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"שפות קלט"</string>
     <string name="send_feedback" msgid="1780431884109392046">"שלח משוב"</string>
diff --git a/java/res/values-ja/strings.xml b/java/res/values-ja/strings.xml
index fbfd3b7..40d55c8 100644
--- a/java/res/values-ja/strings.xml
+++ b/java/res/values-ja/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"システムのデフォルト"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"連絡先の名前を候補に表示"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"連絡先の名前を使用して候補表示や自動修正を行います"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"入力候補のカスタマイズ"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"メッセージなどのやり取りや入力したデータから入力候補を予測します"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"ダブルスペースピリオド"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"スペースバーをダブルタップするとピリオドとスペースを挿入できます"</string>
     <string name="auto_cap" msgid="1719746674854628252">"自動大文字変換"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"時刻"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"音声入力キー"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"メインキーボード上"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"記号キーボード上"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"OFF"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"メインキーボードのマイク"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"記号キーボードのマイク"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"音声入力は無効です"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"入力方法を設定"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"入力言語"</string>
     <string name="send_feedback" msgid="1780431884109392046">"フィードバックを送信"</string>
diff --git a/java/res/values-ka-rGE/strings.xml b/java/res/values-ka-rGE/strings.xml
index dec6b3a..587304f 100644
--- a/java/res/values-ka-rGE/strings.xml
+++ b/java/res/values-ka-rGE/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"სისტემის ნაგულისხმევი"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"კონტაქტის სახელების შეთავაზება"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"კონტაქტებიდან სახელების გამოყენება შეთავაზებებისთვის და კორექციისთვის"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"პერსონალიზებული შეთავაზებები"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"უკეთესი შეთავაზებისთვის თქვენი კომუნიკაციიდან და ტექსტიდან სწავლა"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"წერტილი ორმაგი შორისით"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"შორისზე ორჯერ შეხება დაწერს წერტილს და შორისის სიმბოლოს"</string>
     <string name="auto_cap" msgid="1719746674854628252">"ავტო-კაპიტალიზაცია"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"დრო"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"ხმოვანი შეყვანის კლავიში"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"მთავარ კლავიატურაზე"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"სიმბოლოთა კლავიატურაზე"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"გამორთვა"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"მიკროფონი მთავარ კლავიატურაზე"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"მიკროფონი სიმბოლოთა კლავიატურაზე"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"ხმოვანი შეყვანა გამორთულია"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"შეყვანის მეთოდების კონფიგურაცია"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"შეყვანის ენები"</string>
     <string name="send_feedback" msgid="1780431884109392046">"უკუკავშირის გაგზავნა"</string>
diff --git a/java/res/values-kk/strings.xml b/java/res/values-kk/strings.xml
index 947ff2f..80b289f 100644
--- a/java/res/values-kk/strings.xml
+++ b/java/res/values-kk/strings.xml
@@ -119,12 +119,6 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"уақыт"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Дауыстық енгізу пернесі"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Негізгі пернетақтада"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Таңбалар пернетақтасында"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Өшірулі"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Негізгі пернетақтадағы Mic"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Таңбалар пернетақтасындағы Mic"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Дауыстық енгізу өшірілген"</string>
     <string name="configure_input_method" msgid="373356270290742459">"Енгізу әдістерін теңшеу"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Енгізу тілдері"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Кері байланыс жіберу"</string>
diff --git a/java/res/values-km-rKH/donottranslate.xml b/java/res/values-km-rKH/config-spacing-and-punctuations.xml
similarity index 100%
rename from java/res/values-km-rKH/donottranslate.xml
rename to java/res/values-km-rKH/config-spacing-and-punctuations.xml
diff --git a/java/res/values-km-rKH/strings.xml b/java/res/values-km-rKH/strings.xml
index 86ecc5e..e98afd2 100644
--- a/java/res/values-km-rKH/strings.xml
+++ b/java/res/values-km-rKH/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"លំនាំ​ដើម​​​ប្រព័ន្ធ"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"ស្នើ​ឈ្មោះ​ទំនាក់ទំនង"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"ប្រើ​ឈ្មោះ​ពី​ទំនាក់ទំនង​សម្រាប់​ការ​​ស្នើ និង​​​កែ"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"ការ​ស្នើ​ផ្ទាល់​ខ្លួន"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"រៀន​ពី​ការ​ភ្ជាប់​របស់​អ្នក និង​ទិន្នន័យ​​ដែល​បាន​បញ្ចូល ដើម្បី​​លើក​កម្ពស់​ការ​ស្នើ"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"រយៈ​ពេល​ចុច​ដកឃ្លា​ពីរដង"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"ប៉ះ​ដកឃ្លា​ពីរ​​ដង​បញ្ចូល​​​រយៈ​ពេល​ដែល​អនុវត្ត​តាម​ដកឃ្លា"</string>
     <string name="auto_cap" msgid="1719746674854628252">"ការ​សរសេរ​ជា​អក្សរ​ធំ​​ស្វ័យប្រវត្តិ"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ពេលវេលា"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"គ្រាប់​ចុច​បញ្ចូល​​សំឡេង"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"នៅ​លើ​ក្ដារចុច​ចម្បង"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"នៅ​លើ​ក្ដារចុច​​និមិត្ត​សញ្ញា"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"បិទ"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"មីក្រូហ្វូន​នៅ​លើ​​ក្ដារចុច​ចម្បង"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"មីក្រូហ្វូន​នៅ​លើ​​ក្ដារចុច​និមិត្ត​សញ្ញា"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"បាន​បិទ​ការ​បញ្ចូល​សំឡេង"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"កំណត់​រចនាសម្ព័ន្ធ​វិធីសាស្ត្រ​បញ្ចូល"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"បញ្ចូល​ភាសា"</string>
     <string name="send_feedback" msgid="1780431884109392046">"ផ្ញើ​មតិ​អ្នក​ប្រើ"</string>
diff --git a/java/res/values-ko/strings.xml b/java/res/values-ko/strings.xml
index ca10bdf..207742c 100644
--- a/java/res/values-ko/strings.xml
+++ b/java/res/values-ko/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"시스템 기본값"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"주소록 이름 활용"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"추천 및 수정에 주소록의 이름 사용"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"맞춤 추천 검색어"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"사용자의 대화 내용과 입력한 데이터를 통해 추천 검색어의 정확도를 개선합니다."</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"더블스페이스 마침표"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"스페이스바를 두 번 탭하면 마침표와 공백 한 개가 삽입됩니다."</string>
     <string name="auto_cap" msgid="1719746674854628252">"자동 대문자화"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"시간"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"음성 입력 키"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"기본 키보드"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"기호 키보드"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"사용 안함"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"기본 키보드의 마이크"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"기호 키보드의 마이크"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"음성 입력이 사용 중지됨"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"입력 방법 설정"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"입력 언어"</string>
     <string name="send_feedback" msgid="1780431884109392046">"의견 보내기"</string>
diff --git a/java/res/values-ky/strings.xml b/java/res/values-ky/strings.xml
index e30c4b9..c3aab78 100644
--- a/java/res/values-ky/strings.xml
+++ b/java/res/values-ky/strings.xml
@@ -168,18 +168,6 @@
     <skip />
     <!-- no translation found for voice_input (3583258583521397548) -->
     <skip />
-    <!-- no translation found for voice_input_modes_main_keyboard (3360660341121083174) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_symbols_keyboard (7203213240786084067) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_off (3745699748218082014) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_main_keyboard (6586544292900314339) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_symbols_keyboard (5233725927281932391) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_off (63875609591897607) -->
-    <skip />
     <!-- no translation found for configure_input_method (373356270290742459) -->
     <skip />
     <!-- no translation found for language_selection_title (1651299598555326750) -->
diff --git a/java/res/values-land/config.xml b/java/res/values-land/config.xml
index 7d93cc2..ade7d00 100644
--- a/java/res/values-land/config.xml
+++ b/java/res/values-land/config.xml
@@ -18,6 +18,67 @@
 */
 -->
 
+<!-- Configuration values for Small Phone Landscape. -->
 <resources>
     <bool name="config_use_fullscreen_mode">true</bool>
+
+    <!-- Preferable keyboard height in absolute scale: 1.100in -->
+    <!-- This config_default_keyboard_height value should match with keyboard-heights.xml -->
+    <dimen name="config_default_keyboard_height">176.0dp</dimen>
+    <fraction name="config_min_keyboard_height">45%p</fraction>
+
+    <!-- key_height + key_bottom_gap = config_more_keys_keyboard_key_height -->
+    <dimen name="config_more_keys_keyboard_key_height">44.8dp</dimen>
+    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
+    <!-- config_more_keys_keyboard_key_height x 1.2 -->
+    <dimen name="config_more_keys_keyboard_slide_allowance">53.76dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_gb">1.818%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_gb">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_gb">5.941%p</fraction>
+    <fraction name="config_key_horizontal_gap_gb">0.997%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -1.0 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_gb">-44.8dp</dimen>
+    <dimen name="config_key_preview_offset_gb">0.0dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_holo">2.727%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_holo">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_holo">5.368%p</fraction>
+    <fraction name="config_key_horizontal_gap_holo">1.020%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -0.5 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_holo">-22.4dp</dimen>
+    <dimen name="config_key_preview_offset_holo">1.6dp</dimen>
+
+    <fraction name="config_key_preview_text_ratio">90%</fraction>
+    <fraction name="config_key_letter_ratio">65%</fraction>
+    <fraction name="config_key_large_letter_ratio">74%</fraction>
+    <fraction name="config_key_label_ratio">40%</fraction>
+    <fraction name="config_key_hint_letter_ratio">30%</fraction>
+    <fraction name="config_key_hint_label_ratio">52%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio">40%</fraction>
+    <fraction name="config_language_on_spacebar_text_ratio">40.000%</fraction>
+    <!-- left or right padding of label alignment -->
+    <dimen name="config_key_label_horizontal_padding">8dp</dimen>
+
+    <!-- For 5-row keyboard -->
+    <fraction name="config_key_vertical_gap_5row">3.20%p</fraction>
+    <fraction name="config_key_letter_ratio_5row">78%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio_5row">48%</fraction>
+
+    <dimen name="config_suggestions_strip_height">36dp</dimen>
+    <dimen name="config_more_suggestions_row_height">36dp</dimen>
+    <integer name="config_max_more_suggestions_row">2</integer>
+    <fraction name="config_min_more_suggestions_width">60%</fraction>
+
+    <!-- Gesture floating preview text parameters -->
+    <dimen name="config_gesture_floating_preview_text_size">23dp</dimen>
+    <dimen name="config_gesture_floating_preview_text_offset">54dp</dimen>
+    <dimen name="config_gesture_floating_preview_horizontal_padding">23dp</dimen>
+    <dimen name="config_gesture_floating_preview_vertical_padding">15dp</dimen>
+
+    <!-- Emoji keyboard -->
+    <fraction name="config_emoji_keyboard_key_width">10%p</fraction>
+    <fraction name="config_emoji_keyboard_row_height">50%p</fraction>
+    <fraction name="config_emoji_keyboard_key_letter_size">54%p</fraction>
+    <integer name="config_emoji_keyboard_max_page_key_count">20</integer>
 </resources>
diff --git a/java/res/values-land/dimens.xml b/java/res/values-land/dimens.xml
deleted file mode 100644
index c97e68f..0000000
--- a/java/res/values-land/dimens.xml
+++ /dev/null
@@ -1,83 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2008, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<resources>
-    <!-- Preferable keyboard height in absolute scale: 1.100in -->
-    <!-- This keyboardHeight value should match with keyboard-heights.xml -->
-    <dimen name="keyboardHeight">176.0dp</dimen>
-    <fraction name="minKeyboardHeight">45%p</fraction>
-    <!-- key_height + key_bottom_gap = popup_key_height -->
-    <dimen name="popup_key_height">44.8dp</dimen>
-
-    <fraction name="keyboard_top_padding_gb">1.818%p</fraction>
-    <fraction name="keyboard_bottom_padding_gb">0.0%p</fraction>
-    <fraction name="key_bottom_gap_gb">5.941%p</fraction>
-    <fraction name="key_horizontal_gap_gb">0.997%p</fraction>
-
-    <fraction name="keyboard_top_padding_holo">2.727%p</fraction>
-    <fraction name="keyboard_bottom_padding_holo">0.0%p</fraction>
-    <fraction name="key_bottom_gap_holo">5.368%p</fraction>
-    <fraction name="key_horizontal_gap_holo">1.020%p</fraction>
-
-    <!-- left or right padding of label alignment -->
-    <dimen name="key_label_horizontal_padding">8dp</dimen>
-
-    <fraction name="key_letter_ratio">65%</fraction>
-    <fraction name="key_large_letter_ratio">74%</fraction>
-    <fraction name="key_label_ratio">40%</fraction>
-    <fraction name="key_hint_letter_ratio">30%</fraction>
-    <fraction name="key_hint_label_ratio">52%</fraction>
-    <fraction name="key_uppercase_letter_ratio">40%</fraction>
-    <fraction name="key_preview_text_ratio">90%</fraction>
-    <fraction name="spacebar_text_ratio">40.000%</fraction>
-    <dimen name="key_preview_offset_gb">0.0dp</dimen>
-
-    <!-- For 5-row keyboard -->
-    <fraction name="key_bottom_gap_5row">3.20%p</fraction>
-    <fraction name="key_letter_ratio_5row">78%</fraction>
-    <fraction name="key_uppercase_letter_ratio_5row">48%</fraction>
-
-    <dimen name="key_preview_offset_holo">1.6dp</dimen>
-    <!-- popup_key_height x -0.5 -->
-    <dimen name="more_keys_keyboard_vertical_correction_holo">-22.4dp</dimen>
-
-    <dimen name="suggestions_strip_height">36dp</dimen>
-    <dimen name="more_suggestions_row_height">36dp</dimen>
-    <integer name="max_more_suggestions_row">2</integer>
-    <fraction name="min_more_suggestions_width">60%</fraction>
-    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
-    <!-- popup_key_height x 1.2 -->
-    <dimen name="more_keys_keyboard_slide_allowance">53.76dp</dimen>
-    <!-- popup_key_height x -1.0 -->
-    <dimen name="more_keys_keyboard_vertical_correction_gb">-44.8dp</dimen>
-
-    <!-- Gesture floating preview text parameters -->
-    <dimen name="gesture_floating_preview_text_size">23dp</dimen>
-    <dimen name="gesture_floating_preview_text_offset">54dp</dimen>
-    <dimen name="gesture_floating_preview_horizontal_padding">23dp</dimen>
-    <dimen name="gesture_floating_preview_vertical_padding">15dp</dimen>
-
-    <!-- Emoji keyboard -->
-    <fraction name="emoji_keyboard_key_width">10%p</fraction>
-    <fraction name="emoji_keyboard_row_height">50%p</fraction>
-    <fraction name="emoji_keyboard_key_letter_size">54%p</fraction>
-    <integer name="emoji_keyboard_max_key_count">20</integer>
-
-</resources>
diff --git a/java/res/values-land/setup-dimens-small-phone-land.xml b/java/res/values-land/setup-dimens-small-phone-land.xml
index 088e656..de93eee 100644
--- a/java/res/values-land/setup-dimens-small-phone-land.xml
+++ b/java/res/values-land/setup-dimens-small-phone-land.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">18sp</dimen>
     <dimen name="setup_step_bullet_text_size">18sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">18dp</dimen>
-    <dimen name="setup_step_indicator_height">18dp</dimen>
     <dimen name="setup_step_title_text_size">18sp</dimen>
     <dimen name="setup_step_instruction_text_size">14sp</dimen>
     <dimen name="setup_step_action_text_size">16sp</dimen>
diff --git a/java/res/values-lo-rLA/donottranslate.xml b/java/res/values-lo-rLA/config-spacing-and-punctuations.xml
similarity index 100%
rename from java/res/values-lo-rLA/donottranslate.xml
rename to java/res/values-lo-rLA/config-spacing-and-punctuations.xml
diff --git a/java/res/values-lo-rLA/strings.xml b/java/res/values-lo-rLA/strings.xml
index a4dbc2d..531fec7 100644
--- a/java/res/values-lo-rLA/strings.xml
+++ b/java/res/values-lo-rLA/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"ຄ່າເລີ່ມຕົ້ນຂອງລະບົບ"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"ແນະນຳລາຍຊື່ຜູ່ຕິດຕໍ່"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"ໃຊ້ຊື່ຈາກລາຍຊື່ຜູ່ຕິດຕໍ່ສຳລັບການແນະນຳ ແລະ ການຊ່ວຍແກ້ຄຳ"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"ຄຳແນະນຳຕາມການນຳໃຊ້ຂອງທ່ານ"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"ຮຽນຮູ້ຈາກການສື່ສານ ແລະຂໍ້ມູນທີ່ເຄີຍພິມຂອງທ່ານເພື່ອປັບປຸງຄຳແນະນຳ"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"ຍະຫວ່າງສອງເທື່ອເພື່ອໃສ່ຈ້ຳເມັດ"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"ກົດທີ່ປຸ່ມຍະຫວ່າງສອງເທື່ອເພື່ອໃສ່ຈ້ຳເມັດແລ້ວຕາມດ້ວຍການຍະຫວ່າງ"</string>
     <string name="auto_cap" msgid="1719746674854628252">"ເຮັດໂຕພິມໃຫຍ່ອັດຕະໂນມັດ"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ເວລາ"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"ປຸ່ມປ້ອນຂໍ້ມູນດ້ວຍສຽງ"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"ແປ້ນພິມຫຼັກ"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"ໃນແປ້ນພິມສັນຍາລັກ"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"ປິດ"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"ໄມໃນແປ້ນພິມຫຼັກ"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"ໄມໃນແປ້ນພິມສັນຍາລັກ"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"ການປ້ອນຂໍ້ມູນດ້ວຍສຽງປິດນຳໃຊ້ຢູ່"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"ຕັ້ງຄ່າຮູບແບບການປ້ອນຂໍ້ມູນ"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"ພາສາການປ້ອນຂໍ້ມູນ"</string>
     <string name="send_feedback" msgid="1780431884109392046">"ສົ່ງຄຳຕິຊົມ"</string>
diff --git a/java/res/values-lt/strings.xml b/java/res/values-lt/strings.xml
index 1f94394..714205e0 100644
--- a/java/res/values-lt/strings.xml
+++ b/java/res/values-lt/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Sist. numat. nustat."</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Siūlyti kontaktų vardus"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Siūlant ir taisant naudoti vardus iš „Kontaktų“"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Suasmeninti pasiūlymai"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Mokytis iš ryšių ir įvestų duomenų, siekiant pagerinti pasiūlymus"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Tšk. ir tarp. pal. dukart"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dukart palietus tarpo klavišą įterpiamas taškas ir tarpas."</string>
     <string name="auto_cap" msgid="1719746674854628252">"Automatinis didžiųjų raidžių rašymas"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"laiko"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Įvesties balsu klavišas"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Pagr. klaviatūroje"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Simbolių klaviatūr."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Išjungta"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrof. pagr. klav."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikrof. simb. klav."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Balso įv. neleidž."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigūruoti įvesties metodus"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Įvesties kalbos"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Siųsti atsiliepimą"</string>
diff --git a/java/res/values-lv/strings.xml b/java/res/values-lv/strings.xml
index 8ea24ed..25c0de4 100644
--- a/java/res/values-lv/strings.xml
+++ b/java/res/values-lv/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Sistēmas noklusējums"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Ieteikt kontaktp. vārdus"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Izmantot kontaktpersonu vārdus kā ieteikumus un labojumus"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Personalizēti ieteikumi"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Izmantojiet saziņu un ievadītos datus, lai uzlabotu ieteikumus."</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Dubultpiesk. = punkts"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Divreiz pieskaroties atst. taustiņam, ievada punktu un atstarpi."</string>
     <string name="auto_cap" msgid="1719746674854628252">"Automātiska lielo burtu lietošana"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"laiks"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Balss ievades atslēga"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Uz galv. tastatūras"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Uz simbolu tastat."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Izslēgts"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikr.uz galv.tastat."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikr.uz simb.tastat."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Balss iev. atspējota"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Ievades metožu konfigurēšana"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Ievades valodas"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Sūtīt atsauksmes"</string>
diff --git a/java/res/values-mk/strings.xml b/java/res/values-mk/strings.xml
index 6f685d3..1137fd0 100644
--- a/java/res/values-mk/strings.xml
+++ b/java/res/values-mk/strings.xml
@@ -214,18 +214,6 @@
     <skip />
     <!-- no translation found for voice_input (3583258583521397548) -->
     <skip />
-    <!-- no translation found for voice_input_modes_main_keyboard (3360660341121083174) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_symbols_keyboard (7203213240786084067) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_off (3745699748218082014) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_main_keyboard (6586544292900314339) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_symbols_keyboard (5233725927281932391) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_off (63875609591897607) -->
-    <skip />
     <!-- no translation found for configure_input_method (373356270290742459) -->
     <skip />
     <!-- no translation found for language_selection_title (1651299598555326750) -->
diff --git a/java/res/values-mn-rMN/strings.xml b/java/res/values-mn-rMN/strings.xml
index d417589..2f74dfa 100644
--- a/java/res/values-mn-rMN/strings.xml
+++ b/java/res/values-mn-rMN/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Системийн үндсэн утга"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Харилцагчдын нэрс санал болгох"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Санал болгох, залруулахда Харилцагчдын нэрсээс ашиглах"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Хувийн тохиргоотой зөвлөмжүүд"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Зөвлөмжүүдийг сайжруулахын тулд таны харилцсан, бичсэн зүйлсээс суралцана"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Давхар зайтай цэг"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Ардаа зайтай цэг оруулахын тулд Зай авах дээр давхар товшино уу"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Автоматаар томруулах"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"цаг"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Дуун оруулгын товч"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Үндсэн гар дээр"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Симбол гар дээр"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Идэвхгүй"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Мик үндсэн гар дээр"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Мик симбол гар дээр"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Дуун оруулах идэвхгүйжсэн"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Оруулах аргуудын тохиргоо"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Оруулах хэл"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Санал хүсэлт илгээх"</string>
diff --git a/java/res/values-ms-rMY/strings.xml b/java/res/values-ms-rMY/strings.xml
index c9b4a03..13d3875 100644
--- a/java/res/values-ms-rMY/strings.xml
+++ b/java/res/values-ms-rMY/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Tetapan asal sistem"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Cadangkan nama Kenalan"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Menggunakan nama daripada Kenalan untuk cadangan dan pembetulan"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Cadangan diperibadikan"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Belajar daripada komunikasi &amp; data ditaip utk memperbaik cadangan"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Titik ruang berganda"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Mengetik 2X pada bar ruang memasukkan titik diikuti dengan ruang"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Autopenghurufbesaran"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"masa"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Kunci input suara"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Pada papan kekunci utama"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Pada papan kekunci simbol"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Dimati"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofon pada papan kekunci utama"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikrofon pada papan kekunci simbol"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Input suara dilmphkn"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigurasikan kaedah input"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Bahasa input"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Hantar maklum balas"</string>
diff --git a/java/res/values-nb/strings.xml b/java/res/values-nb/strings.xml
index 00aa10d..16ccadc 100644
--- a/java/res/values-nb/strings.xml
+++ b/java/res/values-nb/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Systemstandard"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Foreslå kontaktnavn"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Bruk navn fra Kontakter til forslag og korrigeringer"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Spesialtilpassede forslag"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Lær av kommunikasjonen og inndataene dine for å få bedre forslag"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Punktum ved doble mellomrom"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dobbeltrykk på mellomromstasten for punktum etterfulgt av mellomrom"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Stor forbokstav"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"tid"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"Nettadresse"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tast for taleinndata"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"På hovedtastatur"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"På talltastatur"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Av"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofon på hovedtast."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikrofon på talltastatur"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Taleinndata er deaktiv."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigurer inndatametoder"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Inndataspråk"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Send tilbakemelding"</string>
diff --git a/java/res/values-nl/strings.xml b/java/res/values-nl/strings.xml
index dcbf2c0..81791fa 100644
--- a/java/res/values-nl/strings.xml
+++ b/java/res/values-nl/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Systeemstandaard"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Contactnamen suggereren"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Namen uit Contacten gebruiken voor suggesties en correcties"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Gepersonaliseerde suggesties"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Suggesties verbeteren met uw communicatie en getypte gegevens"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Dubbeltik is punt, spatie"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dubbeltik op spatiebalk voor een punt gevolgd door een spatie"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Auto-hoofdlettergebruik"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"tijd"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Toets voor spraakinvoer"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Op hoofdtoetsenbord"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Op symbooltoetsenb."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Uitgeschakeld"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Microfoon op hoofdtoetsenbord"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mic op symb.toetsb."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Spraakinvoer is uit"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Invoermethoden configureren"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Invoertalen"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Feedback verzenden"</string>
diff --git a/java/res/values-pl/strings.xml b/java/res/values-pl/strings.xml
index c78674a..cfc6c7c 100644
--- a/java/res/values-pl/strings.xml
+++ b/java/res/values-pl/strings.xml
@@ -33,7 +33,7 @@
     <string name="misc_category" msgid="6894192814868233453">"Inne opcje"</string>
     <string name="advanced_settings" msgid="362895144495591463">"Ustawienia zaawansowane"</string>
     <string name="advanced_settings_summary" msgid="4487980456152830271">"Opcje dla ekspertów"</string>
-    <string name="include_other_imes_in_language_switch_list" msgid="4533689960308565519">"Włącz inne metody wprowadzania"</string>
+    <string name="include_other_imes_in_language_switch_list" msgid="4533689960308565519">"Inne metody wprowadzania"</string>
     <string name="include_other_imes_in_language_switch_list_summary" msgid="840637129103317635">"Klawisz zmiany języka obejmuje też inne metody wprowadzania"</string>
     <string name="show_language_switch_key" msgid="5915478828318774384">"Klawisz zmiany języka"</string>
     <string name="show_language_switch_key_summary" msgid="7343403647474265713">"Pokaż, gdy włączonych jest kilka języków wprowadzania"</string>
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Ustawienie domyślne"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Proponuj osoby z kontaktów"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"W propozycjach i poprawkach użyj nazwisk z kontaktów"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Spersonalizowane sugestie"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Analizuj wiadomości i wpisywane dane, by ulepszać podpowiedzi"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Szybka kropka ze spacją"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dwukrotne kliknięcie spacji wstawia kropkę ze spacją"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Wstawiaj wielkie litery"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"godzina"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Klawisz rozpoznawania mowy"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Na klawiaturze głównej"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Na klawiaturze z symbolami"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Wyłącz"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofon na klawiaturze głównej"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikrofon na klawiaturze z symbolami"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Rozpoznawanie mowy jest wyłączone"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfiguruj metody wprowadzania"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Języki wprowadzania"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Prześlij opinię"</string>
@@ -162,9 +160,9 @@
     <string name="not_now" msgid="6172462888202790482">"Nie teraz"</string>
     <string name="custom_input_style_already_exists" msgid="8008728952215449707">"Taki styl wprowadzania już istnieje: <xliff:g id="INPUT_STYLE_NAME">%s</xliff:g>"</string>
     <string name="prefs_usability_study_mode" msgid="1261130555134595254">"Tryb badania przydatności"</string>
-    <string name="prefs_key_longpress_timeout_settings" msgid="6102240298932897873">"Opóźn. przy przytrzym. przycisku"</string>
-    <string name="prefs_keypress_vibration_duration_settings" msgid="7918341459947439226">"Czas wibr. przy naciśn. przycisku"</string>
-    <string name="prefs_keypress_sound_volume_settings" msgid="6027007337036891623">"Głośność przy naciśn. przycisku"</string>
+    <string name="prefs_key_longpress_timeout_settings" msgid="6102240298932897873">"Opóźnienie przy długim naciśnięciu"</string>
+    <string name="prefs_keypress_vibration_duration_settings" msgid="7918341459947439226">"Wibracja przy naciśniętym klawiszu"</string>
+    <string name="prefs_keypress_sound_volume_settings" msgid="6027007337036891623">"Głośność przy naciśniętym klawiszu"</string>
     <string name="prefs_read_external_dictionary" msgid="2588931418575013067">"Odczyt zewnętrznego pliku słownika"</string>
     <string name="read_external_dictionary_no_files_message" msgid="4947420942224623792">"Brak plików słownika w folderze Pobrane pliki"</string>
     <string name="read_external_dictionary_multiple_files_title" msgid="7637749044265808628">"Wybierz plik słownika do zainstalowania"</string>
diff --git a/java/res/values-port/setup-dimens-small-phone-port.xml b/java/res/values-port/setup-dimens-small-phone-port.xml
index 8ac72ea..cf2751f 100644
--- a/java/res/values-port/setup-dimens-small-phone-port.xml
+++ b/java/res/values-port/setup-dimens-small-phone-port.xml
@@ -20,7 +20,6 @@
     <dimen name="setup_welcome_description_text_size">20sp</dimen>
     <dimen name="setup_step_bullet_text_size">18sp</dimen>
     <dimen name="setup_step_triangle_indicator_height">18dp</dimen>
-    <dimen name="setup_step_indicator_height">18dp</dimen>
     <dimen name="setup_step_title_text_size">18sp</dimen>
     <dimen name="setup_step_instruction_text_size">14sp</dimen>
     <dimen name="setup_step_action_text_size">16sp</dimen>
diff --git a/java/res/values-pt-rPT/strings.xml b/java/res/values-pt-rPT/strings.xml
index c277581..c247d3b 100644
--- a/java/res/values-pt-rPT/strings.xml
+++ b/java/res/values-pt-rPT/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Predef. do sistema"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Sugerir nomes de Contactos"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Utilizar nomes dos Contactos para sugestões e correções"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Sugestões personalizadas"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Aprender com comunicações e dados introd. para melhorar sugestões"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Ponto de espaço duplo"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Tocar duas vezes na barra espaço insere ponto seguido de espaço"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Letras maiúsculas automáticas"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"hora"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URLs"</string>
     <string name="voice_input" msgid="3583258583521397548">"Chave de entrada de voz"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"No teclado principal"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"No teclado símbolos"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Desligar"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mic. tecl. principal"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mic. tecl. símbolos"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Entr. voz desact."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configurar métodos de introdução"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Idiomas de entrada"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Enviar comentários"</string>
diff --git a/java/res/values-pt/strings.xml b/java/res/values-pt/strings.xml
index f98ef8c..50d7975 100644
--- a/java/res/values-pt/strings.xml
+++ b/java/res/values-pt/strings.xml
@@ -39,25 +39,27 @@
     <string name="show_language_switch_key_summary" msgid="7343403647474265713">"Mostrar quando vários idiomas de entrada estiverem ativados"</string>
     <string name="sliding_key_input_preview" msgid="6604262359510068370">"Mostrar indicador de deslize"</string>
     <string name="sliding_key_input_preview_summary" msgid="6340524345729093886">"Mostrar indicação visual ao deslizar teclas Shift ou de símbolos"</string>
-    <string name="key_preview_popup_dismiss_delay" msgid="6213164897443068248">"Dispens. atraso chave princ."</string>
+    <string name="key_preview_popup_dismiss_delay" msgid="6213164897443068248">"Duração de popup da tecla"</string>
     <string name="key_preview_popup_dismiss_no_delay" msgid="2096123151571458064">"Sem atraso"</string>
     <string name="key_preview_popup_dismiss_default_delay" msgid="2166964333903906734">"Padrão"</string>
     <string name="abbreviation_unit_milliseconds" msgid="8700286094028323363">"<xliff:g id="MILLISECONDS">%s</xliff:g> ms"</string>
     <string name="settings_system_default" msgid="6268225104743331821">"Padrão do sistema"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Sugerir nomes de contato"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Usar nomes dos Contatos para sugestões e correções"</string>
-    <string name="use_double_space_period" msgid="8781529969425082860">"Duplo espaço p/ ponto"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Sugestões personalizadas"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Aprender com mensagens e dados digitados para melhorar sugestões"</string>
+    <string name="use_double_space_period" msgid="8781529969425082860">"Duplo espaço para ponto"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Toque duplo na barra de espaço insere um ponto seguido de espaço"</string>
-    <string name="auto_cap" msgid="1719746674854628252">"Capitaliz. automática"</string>
+    <string name="auto_cap" msgid="1719746674854628252">"Capitalização automática"</string>
     <string name="auto_cap_summary" msgid="7934452761022946874">"Iniciar a primeira palavra de cada frase com letra maiúscula"</string>
     <string name="edit_personal_dictionary" msgid="3996910038952940420">"Dicionário pessoal"</string>
     <string name="configure_dictionaries_title" msgid="4238652338556902049">"Dicionários complementares"</string>
     <string name="main_dictionary" msgid="4798763781818361168">"Dicionário principal"</string>
-    <string name="prefs_show_suggestions" msgid="8026799663445531637">"Exibir sugestões de correção"</string>
+    <string name="prefs_show_suggestions" msgid="8026799663445531637">"Mostrar sugestões de correção"</string>
     <string name="prefs_show_suggestions_summary" msgid="1583132279498502825">"Exibir sugestões de palavras durante a digitação"</string>
     <string name="prefs_suggestion_visibility_show_name" msgid="3219916594067551303">"Mostrar sempre"</string>
     <string name="prefs_suggestion_visibility_show_only_portrait_name" msgid="3859783767435239118">"Mostrar em modo retrato"</string>
-    <string name="prefs_suggestion_visibility_hide_name" msgid="6309143926422234673">"Sempre ocultar"</string>
+    <string name="prefs_suggestion_visibility_hide_name" msgid="6309143926422234673">"Não mostrar"</string>
     <string name="prefs_block_potentially_offensive_title" msgid="5078480071057408934">"Bloquear palavras ofensivas"</string>
     <string name="prefs_block_potentially_offensive_summary" msgid="2371835479734991364">"Não sugerir palavras potencialmente ofensivas"</string>
     <string name="auto_correction" msgid="7630720885194996950">"Correção automática"</string>
@@ -71,7 +73,7 @@
     <string name="gesture_input" msgid="826951152254563827">"Ativar a escrita com gestos"</string>
     <string name="gesture_input_summary" msgid="9180350639305731231">"Inserir uma palavra deslizando os dedos pelas letras"</string>
     <string name="gesture_preview_trail" msgid="3802333369335722221">"Mostrar percurso do gesto"</string>
-    <string name="gesture_floating_preview_text" msgid="4443240334739381053">"Visualizaç. dinâmica flutuante"</string>
+    <string name="gesture_floating_preview_text" msgid="4443240334739381053">"Previsão dinâmica flutuante"</string>
     <string name="gesture_floating_preview_text_summary" msgid="4472696213996203533">"Ver a palavra sugerida ao usar gestos"</string>
     <string name="added_word" msgid="8993883354622484372">"<xliff:g id="WORD">%s</xliff:g> : Salvo"</string>
     <string name="spoken_use_headphones" msgid="896961781287283493">"Conecte um fone de ouvido para ouvir as chaves de senha em voz alta."</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"hora"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Chave de entrada de texto por voz"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"No teclado principal"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"No teclado de símb."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Desativado"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mic. no teclado"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mic. no teclado"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Texto por voz desat."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configurar métodos de entrada"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Idiomas de entrada"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Enviar comentários"</string>
diff --git a/java/res/values-rm/strings.xml b/java/res/values-rm/strings.xml
index 3f0bab9..378c254 100644
--- a/java/res/values-rm/strings.xml
+++ b/java/res/values-rm/strings.xml
@@ -209,18 +209,6 @@
     <skip />
     <!-- no translation found for voice_input (3583258583521397548) -->
     <skip />
-    <!-- no translation found for voice_input_modes_main_keyboard (3360660341121083174) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_symbols_keyboard (7203213240786084067) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_off (3745699748218082014) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_main_keyboard (6586544292900314339) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_symbols_keyboard (5233725927281932391) -->
-    <skip />
-    <!-- no translation found for voice_input_modes_summary_off (63875609591897607) -->
-    <skip />
     <!-- no translation found for configure_input_method (373356270290742459) -->
     <skip />
     <string name="language_selection_title" msgid="1651299598555326750">"Linguas da cumonds vocals"</string>
diff --git a/java/res/values-ro/strings.xml b/java/res/values-ro/strings.xml
index 147f83e..4890f26 100644
--- a/java/res/values-ro/strings.xml
+++ b/java/res/values-ro/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Valoare prestabilită"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Sugeraţi nume din Agendă"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Utilizaţi numele din Agendă pentru sugestii şi corecţii"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Sugestii personalizate"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Utilizați comunic. și datele introd. pt. a îmbunătăți sugestiile"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Inserează punct spațiu"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dubla atingere a barei de spațiu inserează punct urmat de spațiu"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Scriere automată cu majuscule"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ore"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"adrese URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tastă pentru intrarea vocală"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Pe tastat. princip."</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Pe tastat. simbol."</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Dezactivată"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mic. pe tast. princ."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Micr. pe tast. simb."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Intr. vocală dezact."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Configuraţi metodele de intrare"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Selectaţi limba"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Trimiteți feedback"</string>
diff --git a/java/res/values-ru/strings.xml b/java/res/values-ru/strings.xml
index 8bbaead..38303df 100644
--- a/java/res/values-ru/strings.xml
+++ b/java/res/values-ru/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"По умолчанию"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Подсказывать имена"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Подсказывать исправления на основе имен из списка контактов"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Пользовательские словари"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Устройство будет запоминать то, что вы вводите чаще всего"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Ставить точки автоматически"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Вводить точку с пробелом двойным нажатием кнопки \"Пробел\"."</string>
     <string name="auto_cap" msgid="1719746674854628252">"Заглавные автоматически"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ввода времени"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"ввода URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Кнопка голосового ввода"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Значок на основной клавиатуре"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Значок на клавиатуре символов"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Выкл."</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Значок на основной клавиатуре"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Значок на клавиатуре символов"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Голосовой ввод откл."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Настройка способов ввода"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Языки ввода"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Отправить отзыв"</string>
diff --git a/java/res/values-sk/strings.xml b/java/res/values-sk/strings.xml
index d1f966c..729afbd 100644
--- a/java/res/values-sk/strings.xml
+++ b/java/res/values-sk/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Predvolené nastav."</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Navrhnúť mená kontaktov"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Používať mená z Kontaktov na návrhy a opravy"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Prispôsobené návrhy"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Zlepšovať návrhy na základe komunikácie a zadaných údajov"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Bodka s medzerou"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dvojitým klepnutím na medzerník vložíte bodku a medzeru."</string>
     <string name="auto_cap" msgid="1719746674854628252">"Veľké písmená automaticky"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"čas"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"Adresa URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Kľúč hlasového vstupu"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Na hlavnej klávesnici"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Na klávesnici so symbolmi"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Vypnuté"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mikrofón na hlavnej klávesnici"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mikrofón na klávesnici so symbolmi"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Hlasový vstup je zakázaný"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigurovať metódy vstupu"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Jazyky vstupu"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Odoslať spätnú väzbu"</string>
@@ -166,7 +164,7 @@
     <string name="prefs_keypress_vibration_duration_settings" msgid="7918341459947439226">"Trvanie vibrov. pri stlač. kl."</string>
     <string name="prefs_keypress_sound_volume_settings" msgid="6027007337036891623">"Hlasitosť pri stlačení klávesu"</string>
     <string name="prefs_read_external_dictionary" msgid="2588931418575013067">"Čítať súbor externého slovníka"</string>
-    <string name="read_external_dictionary_no_files_message" msgid="4947420942224623792">"V priečinku Preberanie nie sú žiadne súbory slovníka"</string>
+    <string name="read_external_dictionary_no_files_message" msgid="4947420942224623792">"V priečinku Sťahovanie nie sú žiadne súbory slovníka"</string>
     <string name="read_external_dictionary_multiple_files_title" msgid="7637749044265808628">"Vyberte súbor slovníka, ktorý chcete nainštalovať"</string>
     <string name="read_external_dictionary_confirm_install_message" msgid="6898610163768980870">"Chcete nainštalovať tento súbor pre jazyk <xliff:g id="LOCALE_NAME">%s</xliff:g>?"</string>
     <string name="error" msgid="8940763624668513648">"Vyskytla sa chyba"</string>
@@ -199,7 +197,7 @@
     <string name="user_dictionaries" msgid="3582332055892252845">"Používateľské slovníky"</string>
     <string name="default_user_dict_pref_name" msgid="1625055720489280530">"Používateľský slovník"</string>
     <string name="dictionary_available" msgid="4728975345815214218">"K dispozícii je slovník"</string>
-    <string name="dictionary_downloading" msgid="2982650524622620983">"Aktuálne sa preberá"</string>
+    <string name="dictionary_downloading" msgid="2982650524622620983">"Aktuálne sa sťahuje"</string>
     <string name="dictionary_installed" msgid="8081558343559342962">"Nainštalované"</string>
     <string name="dictionary_disabled" msgid="8950383219564621762">"Nainštalovaný, zakázaný"</string>
     <string name="cannot_connect_to_dict_service" msgid="9216933695765732398">"Probl. s prip. k sl."</string>
@@ -213,12 +211,12 @@
     <string name="install_dict" msgid="180852772562189365">"Inštalovať"</string>
     <string name="cancel_download_dict" msgid="7843340278507019303">"Zrušiť"</string>
     <string name="delete_dict" msgid="756853268088330054">"Odstrániť"</string>
-    <string name="should_download_over_metered_prompt" msgid="2878629598667658845">"Pre vybratý jazyk mobilného zariadenia je k dispozícii slovník.&lt;br/&gt; Slovník jazyka <xliff:g id="LANGUAGE">%1$s</xliff:g> vám odporúčame &lt;b&gt;prevziať&lt;/b&gt;. Pomôže vám pri zadávaní textu.&lt;br/&gt; &lt;br/&gt; V sieti 3G môže preberanie chvíľu trvať. Ak nemáte &lt;b&gt;neobmedzený dátový program&lt;/b&gt;, môžu sa účtovať poplatky.&lt;br/&gt; Ak s určitosťou neviete aký dátový program používate, vyhľadajte pripojenie k sieti Wi-Fi a preberanie sa spustí automaticky.&lt;br/&gt; &lt;br/&gt; Tip: Slovníky môžete v mobilnom zariadení preberať a odstraňovať v časti &lt;b&gt;Jazyk a vstup&lt;/b&gt; ponuky &lt;b&gt;Nastavenia&lt;/b&gt;."</string>
-    <string name="download_over_metered" msgid="1643065851159409546">"Prevziať (<xliff:g id="SIZE_IN_MEGABYTES">%1$.1f</xliff:g> MB)"</string>
-    <string name="do_not_download_over_metered" msgid="2176209579313941583">"Prevziať cez sieť Wi-Fi"</string>
+    <string name="should_download_over_metered_prompt" msgid="2878629598667658845">"Pre vybratý jazyk mobilného zariadenia je k dispozícii slovník.&lt;br/&gt; Slovník jazyka <xliff:g id="LANGUAGE">%1$s</xliff:g> vám odporúčame &lt;b&gt;stiahnuť&lt;/b&gt;. Pomôže vám pri zadávaní textu.&lt;br/&gt; &lt;br/&gt; V sieti 3G môže sťahovanie chvíľu trvať. Ak nemáte &lt;b&gt;neobmedzený dátový program&lt;/b&gt;, môžu sa účtovať poplatky.&lt;br/&gt; Ak s určitosťou neviete aký dátový program používate, vyhľadajte pripojenie k sieti Wi-Fi a sťahovanie sa spustí automaticky.&lt;br/&gt; &lt;br/&gt; Tip: Slovníky môžete v mobilnom zariadení sťahovať a odstraňovať v časti &lt;b&gt;Jazyk a vstup&lt;/b&gt; ponuky &lt;b&gt;Nastavenia&lt;/b&gt;."</string>
+    <string name="download_over_metered" msgid="1643065851159409546">"Stiahnuť (<xliff:g id="SIZE_IN_MEGABYTES">%1$.1f</xliff:g> MB)"</string>
+    <string name="do_not_download_over_metered" msgid="2176209579313941583">"Stiahnuť cez sieť Wi-Fi"</string>
     <string name="dict_available_notification_title" msgid="6514288591959117288">"K dispozícii je slovník pre jazyk <xliff:g id="LANGUAGE">%1$s</xliff:g>"</string>
     <string name="dict_available_notification_description" msgid="1075194169443163487">"Stlačením skontrolujete a prevezmete"</string>
-    <string name="toast_downloading_suggestions" msgid="1313027353588566660">"Preberanie: návrhy pre jazyk <xliff:g id="LANGUAGE">%1$s</xliff:g> budú čoskoro k dispozícii."</string>
+    <string name="toast_downloading_suggestions" msgid="1313027353588566660">"Sťahovanie: návrhy pre jazyk <xliff:g id="LANGUAGE">%1$s</xliff:g> budú čoskoro k dispozícii."</string>
     <string name="version_text" msgid="2715354215568469385">"Verzia <xliff:g id="VERSION_NUMBER">%1$s</xliff:g>"</string>
     <string name="user_dict_settings_add_menu_title" msgid="1254195365689387076">"Pridať"</string>
     <string name="user_dict_settings_add_dialog_title" msgid="4096700390211748168">"Pridať do slovníka"</string>
diff --git a/java/res/values-sl/strings.xml b/java/res/values-sl/strings.xml
index a0f83c1..f330127 100644
--- a/java/res/values-sl/strings.xml
+++ b/java/res/values-sl/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Privzeto v sistemu"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Predlagaj imena stikov"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Uporaba imen iz stikov za predloge in popravke"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Prilagojeni predlogi"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Vaša sporočila in vnesene podatke uporabi za boljše predloge"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Dva presl. za vnos pike"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Z dvojnim dotikom preslednice vstavite piko in za njo presledek"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Samod. velike začetnice"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"ura"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Tipka za glasovni vnos"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Na glavni tipkovnici"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Na tipk. s simboli"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Izklopljeno"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mik. na glavni tipk."</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mik. na tipk. s sim."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Glas. vnos je onem."</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Nastavitev načinov vnosa"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Jeziki vnosa"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Pošljite povratne informacije"</string>
diff --git a/java/res/values-sr/strings.xml b/java/res/values-sr/strings.xml
index ce4978f..42f7b3b 100644
--- a/java/res/values-sr/strings.xml
+++ b/java/res/values-sr/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Подразумевано"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Предложи имена контаката"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Користи имена из Контаката за предлоге и исправке"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Персонализовани предлози"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Користи комуникације и унете податке ради побољшања предлога"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Тачка и размак"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Двоструким додиром размака умеће се тачка праћена размаком"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Аутоматски унос великих слова"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"време"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Тастер за гласовни унос"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"На главној тастатури"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"На тастатури са симболима"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Искључи"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Микрофон на главној тастатури"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Микрофон на тастатури са симболима"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Гласовни унос је онемогућен"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Конфигурисање метода уноса"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Језици за унос"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Пошаљи повратне информације"</string>
diff --git a/java/res/values-sv/strings.xml b/java/res/values-sv/strings.xml
index afe349a..bc10054 100644
--- a/java/res/values-sv/strings.xml
+++ b/java/res/values-sv/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Standardinställning"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Föreslå kontaktnamn"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Använd namn från Kontakter för förslag och korrigeringar"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Anpassade förslag"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Få bättre förslag genom att använda tidigare angiven data och annan kommunikation"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Dubbelt blanksteg = punkt"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Dubbelt blanksteg ger en punkt följt av mellanslag"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Automatiska versaler"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"klockslag"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"webbadresser"</string>
     <string name="voice_input" msgid="3583258583521397548">"Röstinmatningsknapp"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"På huvudtangentbord"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"På symboltangentbord"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Av"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mick huvudtangentbord"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mick bland symboler"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Röstinmatning inaktiv"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Konfigurera inmatningsmetoder"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Inmatningsspråk"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Skicka feedback"</string>
diff --git a/java/res/values-sw/strings.xml b/java/res/values-sw/strings.xml
index 191ad97..d3ab95a 100644
--- a/java/res/values-sw/strings.xml
+++ b/java/res/values-sw/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Chaguo-msingi la mfumo"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Pendekeza majini ya Anwani"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Tumia majina kutoka kwa Anwani kwa mapendekezo na marekebisho"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Mapendekezo yaliyobadilishwa kukufaa"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Jifunze kutoka kwa mawasiliano yako na data iliyocharazwa ili kuboresha mapendekezo"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Kitone baada ya nafasi mbili"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Kugonga mara mbili kwenye upau nafasi kunaingiza kitone kikifuatiwa na nafasi"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Uwekaji wa herufi kubwa kiotomatiki"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"wakati"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Kibao cha kuweka data kwa kutamka"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Kwenye kibodi kuu"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Kwenye kibodi ya ishara"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Zima"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Maikrofoni kwenye kibodi kuu"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Maikrofoni kwenye kibodi ya ishara"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Kipengele cha kuweka data kwa kutamka kimezimwa"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Sanidi mbinu za uingizaji"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Lugha za uingizaji"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Tuma maoni"</string>
diff --git a/java/res/values-sw430dp/config-per-form-factor.xml b/java/res/values-sw430dp/config-per-form-factor.xml
new file mode 100644
index 0000000..8868081
--- /dev/null
+++ b/java/res/values-sw430dp/config-per-form-factor.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<!-- Configuration values for Large Phone. -->
+<resources>
+    <bool name="config_enable_show_key_preview_popup_option">true</bool>
+    <!-- Whether or not Popup on key press is enabled by default -->
+    <bool name="config_default_key_preview_popup">true</bool>
+    <bool name="config_default_sound_enabled">false</bool>
+    <bool name="config_enable_show_voice_key_option">true</bool>
+    <bool name="config_key_selection_by_dragging_finger">true</bool>
+    <!-- Showing more keys keyboard, just above the touched point if true, aligned to the key if
+         false -->
+    <bool name="config_show_more_keys_keyboard_at_touched_point">false</bool>
+    <bool name="config_use_fullscreen_mode">false</bool>
+</resources>
diff --git a/java/res/values-sw540dp-land/config.xml b/java/res/values-sw430dp/config-screen-metrics.xml
similarity index 77%
copy from java/res/values-sw540dp-land/config.xml
copy to java/res/values-sw430dp/config-screen-metrics.xml
index b3cd727..bc1c964 100644
--- a/java/res/values-sw540dp-land/config.xml
+++ b/java/res/values-sw430dp/config-screen-metrics.xml
@@ -2,7 +2,7 @@
 <!--
 /*
 **
-** Copyright 2011, The Android Open Source Project
+** Copyright 2013, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
@@ -19,5 +19,6 @@
 -->
 
 <resources>
-    <bool name="config_use_fullscreen_mode">false</bool>
+    <!-- Must be aligned with {@link Constants#SCREEN_METRICS_LARGE_PHONE}. -->
+    <integer name="config_screen_metrics">1</integer>
 </resources>
diff --git a/java/res/values-sw540dp-land/dimens.xml b/java/res/values-sw540dp-land/dimens.xml
deleted file mode 100644
index 0024937..0000000
--- a/java/res/values-sw540dp-land/dimens.xml
+++ /dev/null
@@ -1,72 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2011, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<resources>
-    <!-- Preferable keyboard height in absolute scale: 45.0mm -->
-    <!-- This keyboardHeight value should match with keyboard-heights.xml -->
-    <dimen name="keyboardHeight">283.5dp</dimen>
-    <fraction name="minKeyboardHeight">45%p</fraction>
-
-    <fraction name="keyboard_top_padding_gb">2.444%p</fraction>
-    <fraction name="keyboard_bottom_padding_gb">0.0%p</fraction>
-    <fraction name="key_bottom_gap_gb">5.200%p</fraction>
-    <fraction name="key_horizontal_gap_gb">1.447%p</fraction>
-
-    <fraction name="keyboard_top_padding_holo">2.727%p</fraction>
-    <fraction name="keyboard_bottom_padding_holo">0.0%p</fraction>
-    <fraction name="key_bottom_gap_holo">4.5%p</fraction>
-    <fraction name="key_horizontal_gap_holo">0.9%p</fraction>
-
-    <dimen name="popup_key_height">81.9dp</dimen>
-
-    <!-- left or right padding of label alignment -->
-    <dimen name="key_label_horizontal_padding">18dp</dimen>
-
-    <fraction name="key_letter_ratio">50%</fraction>
-    <fraction name="key_large_letter_ratio">48%</fraction>
-    <fraction name="key_label_ratio">32%</fraction>
-    <fraction name="key_hint_letter_ratio">23%</fraction>
-    <fraction name="key_hint_label_ratio">34%</fraction>
-    <fraction name="key_uppercase_letter_ratio">29%</fraction>
-    <fraction name="spacebar_text_ratio">30.0%</fraction>
-    <dimen name="key_uppercase_letter_padding">4dp</dimen>
-
-    <!-- For 5-row keyboard -->
-    <fraction name="key_bottom_gap_5row">3.20%p</fraction>
-    <fraction name="key_letter_ratio_5row">62%</fraction>
-    <fraction name="key_uppercase_letter_ratio_5row">36%</fraction>
-
-    <dimen name="suggestions_strip_padding">252.0dp</dimen>
-    <integer name="max_more_suggestions_row">5</integer>
-    <fraction name="min_more_suggestions_width">50%</fraction>
-
-    <!-- Gesture floating preview text parameters -->
-    <dimen name="gesture_floating_preview_text_size">26dp</dimen>
-    <dimen name="gesture_floating_preview_text_offset">76dp</dimen>
-    <dimen name="gesture_floating_preview_horizontal_padding">26dp</dimen>
-    <dimen name="gesture_floating_preview_vertical_padding">17dp</dimen>
-
-    <!-- Emoji keyboard -->
-    <fraction name="emoji_keyboard_key_width">10%p</fraction>
-    <fraction name="emoji_keyboard_row_height">33%p</fraction>
-    <fraction name="emoji_keyboard_key_letter_size">70%p</fraction>
-    <integer name="emoji_keyboard_max_key_count">30</integer>
-
-</resources>
diff --git a/java/res/values-sw540dp/dimens.xml b/java/res/values-sw540dp/dimens.xml
deleted file mode 100644
index 801b7ac..0000000
--- a/java/res/values-sw540dp/dimens.xml
+++ /dev/null
@@ -1,98 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2011, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<resources>
-    <!-- Preferable keyboard height in absolute scale: 48.0mm -->
-    <!-- This keyboardHeight value should match with keyboard-heights.xml -->
-    <dimen name="keyboardHeight">302.4dp</dimen>
-    <fraction name="maxKeyboardHeight">46%p</fraction>
-    <fraction name="minKeyboardHeight">-35.0%p</fraction>
-
-    <dimen name="popup_key_height">63.0dp</dimen>
-
-    <fraction name="keyboard_top_padding_gb">2.291%p</fraction>
-    <fraction name="keyboard_bottom_padding_gb">0.0%p</fraction>
-    <fraction name="key_bottom_gap_gb">4.625%p</fraction>
-    <fraction name="key_horizontal_gap_gb">2.113%p</fraction>
-
-    <fraction name="keyboard_top_padding_holo">2.335%p</fraction>
-    <fraction name="keyboard_bottom_padding_holo">4.0%p</fraction>
-    <fraction name="key_bottom_gap_holo">4.5%p</fraction>
-    <fraction name="key_horizontal_gap_holo">1.565%p</fraction>
-
-    <dimen name="more_keys_keyboard_key_horizontal_padding">6dp</dimen>
-    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
-    <!-- popup_key_height x 1.2 -->
-    <dimen name="more_keys_keyboard_slide_allowance">98.3dp</dimen>
-    <!-- popup_key_height x -1.0 -->
-    <dimen name="more_keys_keyboard_vertical_correction_gb">-81.9dp</dimen>
-
-    <!-- left or right padding of label alignment -->
-    <dimen name="key_label_horizontal_padding">6dp</dimen>
-    <dimen name="key_hint_letter_padding">3dp</dimen>
-    <dimen name="key_uppercase_letter_padding">3dp</dimen>
-
-    <fraction name="key_letter_ratio">42%</fraction>
-    <fraction name="key_large_letter_ratio">45%</fraction>
-    <fraction name="key_label_ratio">25%</fraction>
-    <fraction name="key_large_label_ratio">32%</fraction>
-    <fraction name="key_hint_letter_ratio">23%</fraction>
-    <fraction name="key_hint_label_ratio">28%</fraction>
-    <fraction name="key_uppercase_letter_ratio">22%</fraction>
-    <fraction name="key_preview_text_ratio">50%</fraction>
-    <fraction name="spacebar_text_ratio">28.0%</fraction>
-    <dimen name="key_preview_height">94.5dp</dimen>
-    <dimen name="key_preview_offset_gb">16.0dp</dimen>
-
-    <!-- For 5-row keyboard -->
-    <fraction name="key_bottom_gap_5row">3.20%p</fraction>
-    <fraction name="key_letter_ratio_5row">52%</fraction>
-    <fraction name="key_uppercase_letter_ratio_5row">27%</fraction>
-
-    <dimen name="key_preview_offset_holo">8.0dp</dimen>
-    <!-- popup_key_height x -0.5 -->
-    <dimen name="more_keys_keyboard_vertical_correction_holo">-31.5dp</dimen>
-
-    <dimen name="suggestions_strip_height">44dp</dimen>
-    <dimen name="more_suggestions_row_height">44dp</dimen>
-    <integer name="max_more_suggestions_row">6</integer>
-    <fraction name="min_more_suggestions_width">90%</fraction>
-    <dimen name="suggestions_strip_padding">94.5dp</dimen>
-    <dimen name="suggestion_min_width">48.0dp</dimen>
-    <dimen name="suggestion_padding">12dp</dimen>
-    <dimen name="suggestion_text_size">22dp</dimen>
-    <dimen name="more_suggestions_hint_text_size">33dp</dimen>
-
-    <!-- Gesture trail parameters -->
-    <dimen name="gesture_trail_width">2.5dp</dimen>
-    <!-- Gesture floating preview text parameters -->
-    <dimen name="gesture_floating_preview_text_size">28dp</dimen>
-    <dimen name="gesture_floating_preview_text_offset">87dp</dimen>
-    <dimen name="gesture_floating_preview_horizontal_padding">28dp</dimen>
-    <dimen name="gesture_floating_preview_vertical_padding">19dp</dimen>
-    <dimen name="gesture_floating_preview_round_radius">3dp</dimen>
-
-    <!-- Emoji keyboard -->
-    <fraction name="emoji_keyboard_key_width">12.5%p</fraction>
-    <fraction name="emoji_keyboard_row_height">33%p</fraction>
-    <fraction name="emoji_keyboard_key_letter_size">60%p</fraction>
-    <integer name="emoji_keyboard_max_key_count">24</integer>
-
-</resources>
diff --git a/java/res/values-sw600dp-land/config.xml b/java/res/values-sw600dp-land/config.xml
new file mode 100644
index 0000000..bd123c4
--- /dev/null
+++ b/java/res/values-sw600dp-land/config.xml
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2011, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<!-- Configuration values for Small Tablet Landscape. -->
+<resources>
+    <!-- Preferable keyboard height in absolute scale: 45.0mm -->
+    <!-- This config_default_keyboard_height value should match with keyboard-heights.xml -->
+    <dimen name="config_default_keyboard_height">283.5dp</dimen>
+    <fraction name="config_min_keyboard_height">45%p</fraction>
+
+    <dimen name="config_more_keys_keyboard_key_height">81.9dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_gb">2.444%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_gb">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_gb">5.200%p</fraction>
+    <fraction name="config_key_horizontal_gap_gb">1.447%p</fraction>
+
+    <fraction name="config_keyboard_top_padding_holo">2.727%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_holo">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_holo">4.5%p</fraction>
+    <fraction name="config_key_horizontal_gap_holo">0.9%p</fraction>
+
+    <fraction name="config_key_letter_ratio">50%</fraction>
+    <fraction name="config_key_large_letter_ratio">48%</fraction>
+    <fraction name="config_key_label_ratio">32%</fraction>
+    <fraction name="config_key_hint_letter_ratio">23%</fraction>
+    <fraction name="config_key_hint_label_ratio">34%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio">29%</fraction>
+    <fraction name="config_language_on_spacebar_text_ratio">30.0%</fraction>
+    <!-- left or right padding of label alignment -->
+    <dimen name="config_key_label_horizontal_padding">18dp</dimen>
+    <dimen name="config_key_shifted_letter_hint_padding">4dp</dimen>
+
+    <!-- For 5-row keyboard -->
+    <fraction name="config_key_vertical_gap_5row">3.20%p</fraction>
+    <fraction name="config_key_letter_ratio_5row">62%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio_5row">36%</fraction>
+
+    <dimen name="config_suggestions_strip_horizontal_padding">252.0dp</dimen>
+    <integer name="config_max_more_suggestions_row">5</integer>
+    <fraction name="config_min_more_suggestions_width">50%</fraction>
+
+    <!-- Gesture floating preview text parameters -->
+    <dimen name="config_gesture_floating_preview_text_size">26dp</dimen>
+    <dimen name="config_gesture_floating_preview_text_offset">76dp</dimen>
+    <dimen name="config_gesture_floating_preview_horizontal_padding">26dp</dimen>
+    <dimen name="config_gesture_floating_preview_vertical_padding">17dp</dimen>
+
+    <!-- Emoji keyboard -->
+    <fraction name="config_emoji_keyboard_key_width">10%p</fraction>
+    <fraction name="config_emoji_keyboard_row_height">33%p</fraction>
+    <fraction name="config_emoji_keyboard_key_letter_size">70%p</fraction>
+    <integer name="config_emoji_keyboard_max_page_key_count">30</integer>
+</resources>
diff --git a/java/res/values-sw600dp/config-per-form-factor.xml b/java/res/values-sw600dp/config-per-form-factor.xml
new file mode 100644
index 0000000..aa9a054
--- /dev/null
+++ b/java/res/values-sw600dp/config-per-form-factor.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<!-- Configuration values for Small Tablet. -->
+<resources>
+    <bool name="config_enable_show_key_preview_popup_option">false</bool>
+    <!-- Whether or not Popup on key press is enabled by default -->
+    <bool name="config_default_key_preview_popup">false</bool>
+    <bool name="config_default_sound_enabled">true</bool>
+    <bool name="config_enable_show_voice_key_option">false</bool>
+    <bool name="config_key_selection_by_dragging_finger">false</bool>
+    <!-- Showing more keys keyboard, just above the touched point if true, aligned to the key if
+         false -->
+    <bool name="config_show_more_keys_keyboard_at_touched_point">false</bool>
+    <bool name="config_use_fullscreen_mode">false</bool>
+</resources>
diff --git a/java/res/values-sw540dp-land/config.xml b/java/res/values-sw600dp/config-screen-metrics.xml
similarity index 76%
copy from java/res/values-sw540dp-land/config.xml
copy to java/res/values-sw600dp/config-screen-metrics.xml
index b3cd727..d16c925 100644
--- a/java/res/values-sw540dp-land/config.xml
+++ b/java/res/values-sw600dp/config-screen-metrics.xml
@@ -2,7 +2,7 @@
 <!--
 /*
 **
-** Copyright 2011, The Android Open Source Project
+** Copyright 2013, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
@@ -19,5 +19,6 @@
 -->
 
 <resources>
-    <bool name="config_use_fullscreen_mode">false</bool>
+    <!-- Must be aligned with {@link Constants#SCREEN_METRICS_SMALL_TABLET}. -->
+    <integer name="config_screen_metrics">3</integer>
 </resources>
diff --git a/java/res/values-sw600dp/config.xml b/java/res/values-sw600dp/config.xml
index e72e494..700350c 100644
--- a/java/res/values-sw600dp/config.xml
+++ b/java/res/values-sw600dp/config.xml
@@ -2,7 +2,7 @@
 <!--
 /*
 **
-** Copyright 2013, The Android Open Source Project
+** Copyright 2011, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
@@ -18,6 +18,78 @@
 */
 -->
 
+<!-- Configuration values for Small Tablet Portrait. -->
 <resources>
-    <bool name="config_enable_show_voice_key_option">false</bool>
+    <dimen name="config_key_hysteresis_distance">40.0dp</dimen>
+
+    <!-- Preferable keyboard height in absolute scale: 48.0mm -->
+    <!-- This config_default_keyboard_height value should match with keyboard-heights.xml -->
+    <dimen name="config_default_keyboard_height">302.4dp</dimen>
+    <fraction name="config_max_keyboard_height">46%p</fraction>
+    <fraction name="config_min_keyboard_height">-35.0%p</fraction>
+
+    <dimen name="config_more_keys_keyboard_key_height">63.0dp</dimen>
+    <dimen name="config_more_keys_keyboard_key_horizontal_padding">6dp</dimen>
+    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
+    <!-- config_more_keys_keyboard_key_height x 1.2 -->
+    <dimen name="config_more_keys_keyboard_slide_allowance">98.3dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_gb">2.291%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_gb">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_gb">4.625%p</fraction>
+    <fraction name="config_key_horizontal_gap_gb">2.113%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -1.0 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_gb">-81.9dp</dimen>
+    <dimen name="config_key_preview_offset_gb">16.0dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_holo">2.335%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_holo">4.0%p</fraction>
+    <fraction name="config_key_vertical_gap_holo">4.5%p</fraction>
+    <fraction name="config_key_horizontal_gap_holo">1.565%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -0.5 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_holo">-31.5dp</dimen>
+    <dimen name="config_key_preview_offset_holo">8.0dp</dimen>
+
+    <dimen name="config_key_preview_height">94.5dp</dimen>
+    <fraction name="config_key_preview_text_ratio">50%</fraction>
+    <fraction name="config_key_letter_ratio">42%</fraction>
+    <fraction name="config_key_large_letter_ratio">45%</fraction>
+    <fraction name="config_key_label_ratio">25%</fraction>
+    <fraction name="config_key_large_label_ratio">32%</fraction>
+    <fraction name="config_key_hint_letter_ratio">23%</fraction>
+    <fraction name="config_key_hint_label_ratio">28%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio">22%</fraction>
+    <fraction name="config_language_on_spacebar_text_ratio">28.0%</fraction>
+    <!-- left or right padding of label alignment -->
+    <dimen name="config_key_label_horizontal_padding">6dp</dimen>
+    <dimen name="config_key_hint_letter_padding">3dp</dimen>
+    <dimen name="config_key_shifted_letter_hint_padding">3dp</dimen>
+
+    <!-- For 5-row keyboard -->
+    <fraction name="config_key_vertical_gap_5row">3.20%p</fraction>
+    <fraction name="config_key_letter_ratio_5row">52%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio_5row">27%</fraction>
+
+    <dimen name="config_suggestions_strip_height">44dp</dimen>
+    <dimen name="config_more_suggestions_row_height">44dp</dimen>
+    <integer name="config_max_more_suggestions_row">6</integer>
+    <fraction name="config_min_more_suggestions_width">90%</fraction>
+    <dimen name="config_suggestions_strip_horizontal_padding">94.5dp</dimen>
+    <dimen name="config_suggestion_min_width">48.0dp</dimen>
+    <dimen name="config_suggestion_text_horizontal_padding">12dp</dimen>
+    <dimen name="config_suggestion_text_size">22dp</dimen>
+    <dimen name="config_more_suggestions_hint_text_size">33dp</dimen>
+
+    <!-- Gesture floating preview text parameters -->
+    <dimen name="config_gesture_floating_preview_text_size">28dp</dimen>
+    <dimen name="config_gesture_floating_preview_text_offset">87dp</dimen>
+    <dimen name="config_gesture_floating_preview_horizontal_padding">28dp</dimen>
+    <dimen name="config_gesture_floating_preview_vertical_padding">19dp</dimen>
+    <dimen name="config_gesture_floating_preview_round_radius">3dp</dimen>
+
+    <!-- Emoji keyboard -->
+    <fraction name="config_emoji_keyboard_key_width">12.5%p</fraction>
+    <fraction name="config_emoji_keyboard_row_height">33%p</fraction>
+    <fraction name="config_emoji_keyboard_key_letter_size">60%p</fraction>
+    <integer name="config_emoji_keyboard_max_page_key_count">24</integer>
 </resources>
diff --git a/java/res/values-sw540dp/touch-position-correction.xml b/java/res/values-sw600dp/touch-position-correction.xml
similarity index 100%
rename from java/res/values-sw540dp/touch-position-correction.xml
rename to java/res/values-sw600dp/touch-position-correction.xml
diff --git a/java/res/values-sw768dp-land/config.xml b/java/res/values-sw768dp-land/config.xml
index b3cd727..4040e29 100644
--- a/java/res/values-sw768dp-land/config.xml
+++ b/java/res/values-sw768dp-land/config.xml
@@ -18,6 +18,54 @@
 */
 -->
 
+<!-- Configuration values for Large Tablet Landscape. -->
 <resources>
-    <bool name="config_use_fullscreen_mode">false</bool>
+    <!-- Preferable keyboard height in absolute scale: 58.0mm -->
+    <!-- This config_default_keyboard_height value should match with keyboard-heights.xml -->
+    <dimen name="config_default_keyboard_height">365.4dp</dimen>
+    <fraction name="config_min_keyboard_height">45%p</fraction>
+
+    <fraction name="config_keyboard_top_padding_gb">1.896%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_gb">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_gb">3.896%p</fraction>
+    <fraction name="config_key_horizontal_gap_gb">1.195%p</fraction>
+
+    <fraction name="config_keyboard_top_padding_holo">1.896%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_holo">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_holo">3.690%p</fraction>
+    <fraction name="config_key_horizontal_gap_holo">1.030%p</fraction>
+    <dimen name="config_key_preview_offset_holo">8.0dp</dimen>
+
+    <dimen name="config_more_keys_keyboard_key_height">81.9dp</dimen>
+
+    <dimen name="config_key_preview_height">107.1dp</dimen>
+    <fraction name="config_key_letter_ratio">43%</fraction>
+    <fraction name="config_key_large_letter_ratio">42%</fraction>
+    <fraction name="config_key_label_ratio">28%</fraction>
+    <fraction name="config_key_hint_letter_ratio">23%</fraction>
+    <fraction name="config_key_hint_label_ratio">28%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio">24%</fraction>
+    <fraction name="config_language_on_spacebar_text_ratio">24.00%</fraction>
+    <!-- left or right padding of label alignment -->
+    <dimen name="config_key_label_horizontal_padding">18dp</dimen>
+
+    <!-- For 5-row keyboard -->
+    <fraction name="config_key_vertical_gap_5row">2.65%p</fraction>
+    <fraction name="config_key_letter_ratio_5row">53%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio_5row">30%</fraction>
+
+    <dimen name="config_suggestions_strip_horizontal_padding">252.0dp</dimen>
+    <fraction name="config_min_more_suggestions_width">50%</fraction>
+
+    <!-- Gesture floating preview text parameters -->
+    <dimen name="config_gesture_floating_preview_text_size">32dp</dimen>
+    <dimen name="config_gesture_floating_preview_text_offset">100dp</dimen>
+    <dimen name="config_gesture_floating_preview_horizontal_padding">32dp</dimen>
+    <dimen name="config_gesture_floating_preview_vertical_padding">21dp</dimen>
+
+    <!-- Emoji keyboard -->
+    <fraction name="config_emoji_keyboard_key_width">7.69%p</fraction>
+    <fraction name="config_emoji_keyboard_row_height">33%p</fraction>
+    <fraction name="config_emoji_keyboard_key_letter_size">60%p</fraction>
+    <integer name="config_emoji_keyboard_max_page_key_count">39</integer>
 </resources>
diff --git a/java/res/values-sw768dp-land/dimens.xml b/java/res/values-sw768dp-land/dimens.xml
deleted file mode 100644
index 653f5e7..0000000
--- a/java/res/values-sw768dp-land/dimens.xml
+++ /dev/null
@@ -1,73 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2010, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<resources>
-    <!-- Preferable keyboard height in absolute scale: 58.0mm -->
-    <!-- This keyboardHeight value should match with keyboard-heights.xml -->
-    <dimen name="keyboardHeight">365.4dp</dimen>
-    <fraction name="minKeyboardHeight">45%p</fraction>
-
-    <fraction name="keyboard_top_padding_gb">1.896%p</fraction>
-    <fraction name="keyboard_bottom_padding_gb">0.0%p</fraction>
-    <fraction name="key_bottom_gap_gb">3.896%p</fraction>
-    <fraction name="key_horizontal_gap_gb">1.195%p</fraction>
-
-    <fraction name="keyboard_top_padding_holo">1.896%p</fraction>
-    <fraction name="keyboard_bottom_padding_holo">0.0%p</fraction>
-    <fraction name="key_bottom_gap_holo">3.690%p</fraction>
-    <fraction name="key_horizontal_gap_holo">1.030%p</fraction>
-
-    <dimen name="popup_key_height">81.9dp</dimen>
-
-    <!-- left or right padding of label alignment -->
-    <dimen name="key_label_horizontal_padding">18dp</dimen>
-
-    <fraction name="key_letter_ratio">43%</fraction>
-    <fraction name="key_large_letter_ratio">42%</fraction>
-    <fraction name="key_label_ratio">28%</fraction>
-    <fraction name="key_hint_letter_ratio">23%</fraction>
-    <fraction name="key_hint_label_ratio">28%</fraction>
-    <fraction name="key_uppercase_letter_ratio">24%</fraction>
-    <fraction name="spacebar_text_ratio">24.00%</fraction>
-    <dimen name="key_preview_height">107.1dp</dimen>
-
-    <!-- For 5-row keyboard -->
-    <fraction name="key_bottom_gap_5row">2.65%p</fraction>
-    <fraction name="key_letter_ratio_5row">53%</fraction>
-    <fraction name="key_uppercase_letter_ratio_5row">30%</fraction>
-
-    <dimen name="key_preview_offset_holo">8.0dp</dimen>
-
-    <dimen name="suggestions_strip_padding">252.0dp</dimen>
-    <fraction name="min_more_suggestions_width">50%</fraction>
-
-    <!-- Gesture floating preview text parameters -->
-    <dimen name="gesture_floating_preview_text_size">32dp</dimen>
-    <dimen name="gesture_floating_preview_text_offset">100dp</dimen>
-    <dimen name="gesture_floating_preview_horizontal_padding">32dp</dimen>
-    <dimen name="gesture_floating_preview_vertical_padding">21dp</dimen>
-
-    <!-- Emoji keyboard -->
-    <fraction name="emoji_keyboard_key_width">7.69%p</fraction>
-    <fraction name="emoji_keyboard_row_height">33%p</fraction>
-    <fraction name="emoji_keyboard_key_letter_size">60%p</fraction>
-    <integer name="emoji_keyboard_max_key_count">39</integer>
-
-</resources>
diff --git a/java/res/values-sw540dp/config.xml b/java/res/values-sw768dp/config-per-form-factor.xml
similarity index 60%
rename from java/res/values-sw540dp/config.xml
rename to java/res/values-sw768dp/config-per-form-factor.xml
index 027780c..b90fbae 100644
--- a/java/res/values-sw540dp/config.xml
+++ b/java/res/values-sw768dp/config-per-form-factor.xml
@@ -2,7 +2,7 @@
 <!--
 /*
 **
-** Copyright 2011, The Android Open Source Project
+** Copyright 2013, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
@@ -18,22 +18,16 @@
 */
 -->
 
+<!-- Configuration values for Large Tablet. -->
 <resources>
-    <bool name="config_enable_show_option_of_key_preview_popup">false</bool>
-    <bool name="config_enable_bigram_suggestions_option">false</bool>
+    <bool name="config_enable_show_key_preview_popup_option">false</bool>
     <!-- Whether or not Popup on key press is enabled by default -->
     <bool name="config_default_key_preview_popup">false</bool>
     <bool name="config_default_sound_enabled">true</bool>
-    <bool name="config_auto_correction_spacebar_led_enabled">false</bool>
-    <!-- The language is never displayed if == 0, always displayed if < 0 -->
-    <integer name="config_delay_before_fadeout_language_on_spacebar">1200</integer>
-    <integer name="config_max_more_keys_column">5</integer>
-    <!--
-        Configuration for MainKeyboardView
-    -->
-    <dimen name="config_key_hysteresis_distance">40.0dp</dimen>
-    <bool name="config_sliding_key_input_enabled">false</bool>
+    <bool name="config_enable_show_voice_key_option">false</bool>
+    <bool name="config_key_selection_by_dragging_finger">false</bool>
     <!-- Showing more keys keyboard, just above the touched point if true, aligned to the key if
          false -->
     <bool name="config_show_more_keys_keyboard_at_touched_point">true</bool>
+    <bool name="config_use_fullscreen_mode">false</bool>
 </resources>
diff --git a/java/res/values-sw540dp-land/config.xml b/java/res/values-sw768dp/config-screen-metrics.xml
similarity index 76%
copy from java/res/values-sw540dp-land/config.xml
copy to java/res/values-sw768dp/config-screen-metrics.xml
index b3cd727..7769ad8 100644
--- a/java/res/values-sw540dp-land/config.xml
+++ b/java/res/values-sw768dp/config-screen-metrics.xml
@@ -2,7 +2,7 @@
 <!--
 /*
 **
-** Copyright 2011, The Android Open Source Project
+** Copyright 2013, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
@@ -19,5 +19,6 @@
 -->
 
 <resources>
-    <bool name="config_use_fullscreen_mode">false</bool>
+    <!-- Must be aligned with {@link Constants#SCREEN_METRICS_LARGE_TABLET}. -->
+    <integer name="config_screen_metrics">2</integer>
 </resources>
diff --git a/java/res/values-sw768dp/config.xml b/java/res/values-sw768dp/config.xml
index e1c07d6..33286c6 100644
--- a/java/res/values-sw768dp/config.xml
+++ b/java/res/values-sw768dp/config.xml
@@ -18,28 +18,76 @@
 */
 -->
 
+<!-- Configuration values for Large Tablet Portrait. -->
 <resources>
-    <bool name="config_enable_show_voice_key_option">false</bool>
-    <bool name="config_enable_show_option_of_key_preview_popup">false</bool>
-    <bool name="config_enable_bigram_suggestions_option">false</bool>
-    <!-- Whether or not Popup on key press is enabled by default -->
-    <bool name="config_default_key_preview_popup">false</bool>
-    <bool name="config_default_sound_enabled">true</bool>
-    <bool name="config_auto_correction_spacebar_led_enabled">false</bool>
-    <integer name="config_max_more_keys_column">5</integer>
-    <!--
-        Configuration for MainKeyboardView
-    -->
-    <bool name="config_sliding_key_input_enabled">false</bool>
-    <!-- Showing more keys keyboard, just above the touched point if true, aligned to the key if
-         false -->
-    <bool name="config_show_more_keys_keyboard_at_touched_point">true</bool>
-    <!--  Screen metrics for logging.
-            0 = "mdpi phone screen"
-            1 = "hdpi phone screen"
-            2 = "mdpi 11 inch tablet screen"
-            3 = "xhdpi phone screen?"
-            4 = ?
-    -->
-    <integer name="log_screen_metrics">2</integer>
+    <!-- Preferable keyboard height in absolute scale: 48.0mm -->
+    <!-- This config_default_keyboard_height value should match with keyboard-heights.xml -->
+    <dimen name="config_default_keyboard_height">302.4dp</dimen>
+    <fraction name="config_max_keyboard_height">46%p</fraction>
+    <fraction name="config_min_keyboard_height">-35.0%p</fraction>
+
+    <fraction name="config_keyboard_top_padding_gb">2.291%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_gb">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_gb">4.687%p</fraction>
+    <fraction name="config_key_horizontal_gap_gb">1.272%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -1.0 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_gb">-81.9dp</dimen>
+    <dimen name="config_key_preview_offset_gb">16.0dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_holo">2.335%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_holo">0.0%p</fraction>
+    <fraction name="config_key_vertical_gap_holo">3.312%p</fraction>
+    <fraction name="config_key_horizontal_gap_holo">1.066%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -0.5 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_holo">-31.5dp</dimen>
+    <dimen name="config_key_preview_offset_holo">8.0dp</dimen>
+
+    <dimen name="config_more_keys_keyboard_key_height">63.0dp</dimen>
+    <dimen name="config_more_keys_keyboard_key_horizontal_padding">12dp</dimen>
+    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
+    <!-- config_more_keys_keyboard_key_height x 1.2 -->
+    <dimen name="config_more_keys_keyboard_slide_allowance">98.3dp</dimen>
+
+    <dimen name="config_key_preview_height">94.5dp</dimen>
+    <fraction name="config_key_preview_text_ratio">50%</fraction>
+    <fraction name="config_key_letter_ratio">40%</fraction>
+    <fraction name="config_key_large_letter_ratio">42%</fraction>
+    <fraction name="config_key_label_ratio">28%</fraction>
+    <fraction name="config_key_large_label_ratio">28%</fraction>
+    <fraction name="config_key_hint_letter_ratio">23%</fraction>
+    <fraction name="config_key_hint_label_ratio">28%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio">26%</fraction>
+    <fraction name="config_language_on_spacebar_text_ratio">29.03%</fraction>
+    <!-- left or right padding of label alignment -->
+    <dimen name="config_key_label_horizontal_padding">6dp</dimen>
+    <dimen name="config_key_hint_letter_padding">3dp</dimen>
+    <dimen name="config_key_shifted_letter_hint_padding">3dp</dimen>
+
+    <!-- For 5-row keyboard -->
+    <fraction name="config_key_vertical_gap_5row">2.95%p</fraction>
+    <fraction name="config_key_letter_ratio_5row">51%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio_5row">33%</fraction>
+
+    <dimen name="config_suggestions_strip_height">44dp</dimen>
+    <dimen name="config_more_suggestions_row_height">44dp</dimen>
+    <integer name="config_max_more_suggestions_row">6</integer>
+    <fraction name="config_min_more_suggestions_width">90%</fraction>
+    <dimen name="config_suggestions_strip_horizontal_padding">94.5dp</dimen>
+    <dimen name="config_suggestion_min_width">46dp</dimen>
+    <dimen name="config_suggestion_text_horizontal_padding">8dp</dimen>
+    <dimen name="config_suggestion_text_size">22dp</dimen>
+    <dimen name="config_more_suggestions_hint_text_size">33dp</dimen>
+
+    <!-- Gesture floating preview text parameters -->
+    <dimen name="config_gesture_floating_preview_text_size">26dp</dimen>
+    <dimen name="config_gesture_floating_preview_text_offset">86dp</dimen>
+    <dimen name="config_gesture_floating_preview_horizontal_padding">26dp</dimen>
+    <dimen name="config_gesture_floating_preview_vertical_padding">17dp</dimen>
+    <dimen name="config_gesture_floating_preview_round_radius">3dp</dimen>
+
+    <!-- Emoji keyboard -->
+    <fraction name="config_emoji_keyboard_key_width">10%p</fraction>
+    <fraction name="config_emoji_keyboard_row_height">33%p</fraction>
+    <fraction name="config_emoji_keyboard_key_letter_size">68%p</fraction>
+    <integer name="config_emoji_keyboard_max_page_key_count">30</integer>
 </resources>
diff --git a/java/res/values-sw768dp/dimens.xml b/java/res/values-sw768dp/dimens.xml
deleted file mode 100644
index 4671aa2..0000000
--- a/java/res/values-sw768dp/dimens.xml
+++ /dev/null
@@ -1,98 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2010, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<resources>
-    <!-- Preferable keyboard height in absolute scale: 48.0mm -->
-    <!-- This keyboardHeight value should match with keyboard-heights.xml -->
-    <dimen name="keyboardHeight">302.4dp</dimen>
-    <fraction name="maxKeyboardHeight">46%p</fraction>
-    <fraction name="minKeyboardHeight">-35.0%p</fraction>
-
-    <fraction name="keyboard_top_padding_gb">2.291%p</fraction>
-    <fraction name="keyboard_bottom_padding_gb">0.0%p</fraction>
-    <fraction name="key_bottom_gap_gb">4.687%p</fraction>
-    <fraction name="key_horizontal_gap_gb">1.272%p</fraction>
-
-    <fraction name="keyboard_top_padding_holo">2.335%p</fraction>
-    <fraction name="keyboard_bottom_padding_holo">0.0%p</fraction>
-    <fraction name="key_bottom_gap_holo">3.312%p</fraction>
-    <fraction name="key_horizontal_gap_holo">1.066%p</fraction>
-
-    <dimen name="popup_key_height">63.0dp</dimen>
-
-    <dimen name="more_keys_keyboard_key_horizontal_padding">12dp</dimen>
-    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
-    <!-- popup_key_height x 1.2 -->
-    <dimen name="more_keys_keyboard_slide_allowance">98.3dp</dimen>
-    <!-- popup_key_height x -1.0 -->
-    <dimen name="more_keys_keyboard_vertical_correction_gb">-81.9dp</dimen>
-
-    <!-- left or right padding of label alignment -->
-    <dimen name="key_label_horizontal_padding">6dp</dimen>
-    <dimen name="key_hint_letter_padding">3dp</dimen>
-    <dimen name="key_uppercase_letter_padding">3dp</dimen>
-
-    <fraction name="key_letter_ratio">40%</fraction>
-    <fraction name="key_large_letter_ratio">42%</fraction>
-    <fraction name="key_label_ratio">28%</fraction>
-    <fraction name="key_large_label_ratio">28%</fraction>
-    <fraction name="key_hint_letter_ratio">23%</fraction>
-    <fraction name="key_hint_label_ratio">28%</fraction>
-    <fraction name="key_uppercase_letter_ratio">26%</fraction>
-    <fraction name="key_preview_text_ratio">50%</fraction>
-    <fraction name="spacebar_text_ratio">29.03%</fraction>
-    <dimen name="key_preview_height">94.5dp</dimen>
-    <dimen name="key_preview_offset_gb">16.0dp</dimen>
-
-    <!-- For 5-row keyboard -->
-    <fraction name="key_bottom_gap_5row">2.95%p</fraction>
-    <fraction name="key_letter_ratio_5row">51%</fraction>
-    <fraction name="key_uppercase_letter_ratio_5row">33%</fraction>
-
-    <dimen name="key_preview_offset_holo">8.0dp</dimen>
-    <!-- popup_key_height x -0.5 -->
-    <dimen name="more_keys_keyboard_vertical_correction_holo">-31.5dp</dimen>
-
-    <dimen name="suggestions_strip_height">44dp</dimen>
-    <dimen name="more_suggestions_row_height">44dp</dimen>
-    <integer name="max_more_suggestions_row">6</integer>
-    <fraction name="min_more_suggestions_width">90%</fraction>
-    <dimen name="suggestions_strip_padding">94.5dp</dimen>
-    <dimen name="suggestion_min_width">46dp</dimen>
-    <dimen name="suggestion_padding">8dp</dimen>
-    <dimen name="suggestion_text_size">22dp</dimen>
-    <dimen name="more_suggestions_hint_text_size">33dp</dimen>
-
-    <!-- Gesture trail parameters -->
-    <dimen name="gesture_trail_width">2.5dp</dimen>
-    <!-- Gesture floating preview text parameters -->
-    <dimen name="gesture_floating_preview_text_size">26dp</dimen>
-    <dimen name="gesture_floating_preview_text_offset">86dp</dimen>
-    <dimen name="gesture_floating_preview_horizontal_padding">26dp</dimen>
-    <dimen name="gesture_floating_preview_vertical_padding">17dp</dimen>
-    <dimen name="gesture_floating_preview_round_radius">3dp</dimen>
-
-    <!-- Emoji keyboard -->
-    <fraction name="emoji_keyboard_key_width">10%p</fraction>
-    <fraction name="emoji_keyboard_row_height">33%p</fraction>
-    <fraction name="emoji_keyboard_key_letter_size">68%p</fraction>
-    <integer name="emoji_keyboard_max_key_count">30</integer>
-
-</resources>
diff --git a/java/res/values-th/donottranslate.xml b/java/res/values-th/config-spacing-and-punctuations.xml
similarity index 100%
rename from java/res/values-th/donottranslate.xml
rename to java/res/values-th/config-spacing-and-punctuations.xml
diff --git a/java/res/values-th/strings.xml b/java/res/values-th/strings.xml
index 9249c05..2fbe63d 100644
--- a/java/res/values-th/strings.xml
+++ b/java/res/values-th/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"ค่าเริ่มต้นของระบบ"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"แนะนำชื่อผู้ติดต่อ"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"ใช้ชื่อจากรายชื่อติดต่อสำหรับคำแนะนำและการแก้ไข"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"คำแนะนำในแบบของคุณ"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"เรียนรู้จากการสื่อสารและข้อมูลที่พิมพ์ของคุณเพื่อปรับปรุงคำแนะนำ"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"แตะ Space สองครั้งแทรกจุด"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"แตะ Spacebar สองครั้งจะแทรกจุดตามด้วยช่องว่างหนึ่งช่อง"</string>
     <string name="auto_cap" msgid="1719746674854628252">"ปรับเป็นตัวพิมพ์ใหญ่อัตโนมัติ"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"เวลา"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"แป้นการป้อนข้อมูลด้วยเสียง"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"บนแป้นพิมพ์หลัก"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"บนแป้นพิมพ์สัญลักษณ์"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"ปิด"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"ไมค์บนแป้นพิมพ์หลัก"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"ไมค์บนแป้นพิมพ์สัญลักษณ์"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"ปิดใช้งานป้อนข้อมูลด้วยเสียง"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"กำหนดค่าวิธีการป้อนข้อมูล"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"ภาษาในการป้อนข้อมูล"</string>
     <string name="send_feedback" msgid="1780431884109392046">"ส่งข้อเสนอแนะ"</string>
diff --git a/java/res/values-tl/strings.xml b/java/res/values-tl/strings.xml
index df6bda0..2a0e40c 100644
--- a/java/res/values-tl/strings.xml
+++ b/java/res/values-tl/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Default ng system"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Mungkahi pangalan Contact"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Gamitin pangalan mula Mga Contact sa mga mungkahi\'t pagwawasto"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Personalized suggestions"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Pahusayin ang suhestiyon batay sa pag-uusap at na-type na data"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Double-space period"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Naglalagay ng tuldok na may puwang ang pag-double tap sa spacebar"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Auto-capitalization"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"oras"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Voice input key"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Sa pangunahing keyboard"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Sa keyboard ng mga simbolo"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Naka-off"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Mic sa pangunahing keyboard"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Mic sa keyboard ng mga simbolo"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Hindi pinagana ang voice input"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"I-configure ang mga pamamaraan ng pag-input"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Mag-input ng mga wika"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Magpadala ng feedback"</string>
diff --git a/java/res/values-tr/strings.xml b/java/res/values-tr/strings.xml
index a142951..26facee 100644
--- a/java/res/values-tr/strings.xml
+++ b/java/res/values-tr/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Sistem varsayılanı"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Kişi Adları öner"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Öneri ve düzeltmeler için Kişiler\'deki adları kullan"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Kişisel öneriler"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Önerileri iyileştirmek için iletişimlerimden ve yazılan verilerden öğren"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Çift boşlukla nokta ekleme"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Boşluk çubuğuna iki kez vurmak nokta ve ardından bir boşluk ekler"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Otomatik olarak büyük harf yap"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"saat"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Ses girişi tuşu"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Ana klavyede"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Simge klavyesinde"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Kapalı"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Ana klavyedeki mikrofon"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Simge klavysnd mikrf"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Sesle grş devre dışı"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Giriş yöntemlerini yapılandır"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Giriş dilleri"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Geri bildirim gönder"</string>
diff --git a/java/res/values-uk/strings.xml b/java/res/values-uk/strings.xml
index da26d50..eb249fb 100644
--- a/java/res/values-uk/strings.xml
+++ b/java/res/values-uk/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"За умовчанням"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Пропон. імена контактів"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Використ. імена зі списку контактів для пропозицій і виправлень"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Персональні пропозиції"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Пристрій буде запам’ятовувати, що ви пишете, надсилаєте й отримуєте"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Крапка подвійним пробілом"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Подвійне натискання пробілу вставляє крапку з пробілом після неї"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Авто викор. вел. літер"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"час"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL-адреси"</string>
     <string name="voice_input" msgid="3583258583521397548">"Ключ голосового вводу"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"На основ. клавіатурі"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Символьна клавіатура"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Вимк."</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Мікрофон на основній клавіатурі"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Miкр. на симв. клавіат."</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Голос. ввід вимкнено"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Налаштування методів введення"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Мови вводу"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Надіслати відгук"</string>
diff --git a/java/res/values-vi/strings.xml b/java/res/values-vi/strings.xml
index 81cd373..b1cabed 100644
--- a/java/res/values-vi/strings.xml
+++ b/java/res/values-vi/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Mặc định của hệ thống"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Đề xuất tên liên hệ"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Sử dụng tên từ Danh bạ cho các đề xuất và chỉnh sửa"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Đề xuất được cá nhân hóa"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Tìm hiểu từ thông tin liên lạc và dữ liệu đã nhập của bạn để cải thiện đề xuất"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Dấu cách đôi"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Nhấn đúp vào phím cách sẽ chèn thêm một dấu sau dấu cách"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Tự động viết hoa"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"giờ"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Khóa nhập giọng nói"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Trên bàn phím chính"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Trên bàn phím biểu tượng"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"Tắt"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"Micrô trên bàn phím chính"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Micrô trên bàn phím biểu tượng"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Nhập liệu bằng giọng nói đã bị tắt"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Định cấu hình phương thức nhập"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Ngôn ngữ nhập"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Gửi phản hồi"</string>
diff --git a/java/res/values-zh-rCN/strings.xml b/java/res/values-zh-rCN/strings.xml
index d347c9c..e5a576c 100644
--- a/java/res/values-zh-rCN/strings.xml
+++ b/java/res/values-zh-rCN/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"系统默认值"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"联系人姓名建议"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"根据通讯录中的姓名提供建议和更正"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"个性化建议"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"根据您的通信记录和以往输入的数据来完善建议"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"双击空格插入句号"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"双击空格键可插入句号并后跟空格"</string>
     <string name="auto_cap" msgid="1719746674854628252">"自动大写"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"时间"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"网址"</string>
     <string name="voice_input" msgid="3583258583521397548">"语音输入键"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"主键盘上"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"符号键盘上"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"关闭"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"主键盘上的麦克风"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"符号键盘上的麦克风"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"语音输入功能已停用"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"配置输入法"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"输入语言"</string>
     <string name="send_feedback" msgid="1780431884109392046">"发送反馈"</string>
diff --git a/java/res/values-zh-rHK/strings.xml b/java/res/values-zh-rHK/strings.xml
index 3060455..534a1b1 100644
--- a/java/res/values-zh-rHK/strings.xml
+++ b/java/res/values-zh-rHK/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"系統預設"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"建議聯絡人名稱"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"使用「聯絡人」的名稱提供建議與修正"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"個人化建議"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"根據您的通訊記錄和已輸入的資料改善建議"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"按兩下空格鍵插入句號"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"只要輕按兩下空格鍵，即可插入句號並在後面加上一個空格"</string>
     <string name="auto_cap" msgid="1719746674854628252">"自動大寫"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"時間"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"網址"</string>
     <string name="voice_input" msgid="3583258583521397548">"語音輸入鍵"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"於主鍵盤"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"符號鍵盤上"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"關閉"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"主鍵盤上的麥克風"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"符號鍵盤上的麥克風"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"語音輸入已停用"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"設定輸入法"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"輸入語言"</string>
     <string name="send_feedback" msgid="1780431884109392046">"傳送意見"</string>
diff --git a/java/res/values-zh-rTW/strings.xml b/java/res/values-zh-rTW/strings.xml
index 2c474b7..b7b94ee 100644
--- a/java/res/values-zh-rTW/strings.xml
+++ b/java/res/values-zh-rTW/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"系統預設"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"聯絡人姓名建議"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"根據「聯絡人」名稱提供建議與修正"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"個人化建議"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"根據您的通訊紀錄和以往輸入的資料改善建議項目"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"輕按兩下空格鍵即插入句號"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"輕按兩下空格鍵可插入句號另加一個空格"</string>
     <string name="auto_cap" msgid="1719746674854628252">"自動大寫"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"時間"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"網址"</string>
     <string name="voice_input" msgid="3583258583521397548">"語音輸入按鍵"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"主鍵盤上"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"符號鍵盤上"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"關閉"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"主鍵盤上的麥克風"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"符號鍵盤上的麥克風"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"語音輸入已停用"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"設定輸入法"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"輸入語言"</string>
     <string name="send_feedback" msgid="1780431884109392046">"提供意見"</string>
diff --git a/java/res/values-zu/strings.xml b/java/res/values-zu/strings.xml
index 27d1131..9cf6cb9 100644
--- a/java/res/values-zu/strings.xml
+++ b/java/res/values-zu/strings.xml
@@ -46,6 +46,8 @@
     <string name="settings_system_default" msgid="6268225104743331821">"Okuzenzakalelayo kwesistimu"</string>
     <string name="use_contacts_dict" msgid="4435317977804180815">"Sikisela amagama Othintana nabo"</string>
     <string name="use_contacts_dict_summary" msgid="6599983334507879959">"Amagama abasebenzisi kusuka Kothintana nabo bokusikisela nokulungisa"</string>
+    <string name="use_personalized_dicts" msgid="5167396352105467626">"Iziphakamiso ezenziwe okomuntu siqu"</string>
+    <string name="use_personalized_dicts_summary" msgid="4331467814162666438">"Funda kusuka kwezoxhumano zakho nedatha ethayiphiwe ukuze uthuthukise iziphakamiso"</string>
     <string name="use_double_space_period" msgid="8781529969425082860">"Isikhathi se-Double-space"</string>
     <string name="use_double_space_period_summary" msgid="6532892187247952799">"Ukuthepha kabili kubha yesikhala kufaka isikhathi esilandelwa yisikhala"</string>
     <string name="auto_cap" msgid="1719746674854628252">"Ukwenza ofeleba okuzenzakalelayo"</string>
@@ -117,12 +119,8 @@
     <string name="keyboard_mode_time" msgid="4381856885582143277">"isikhathi"</string>
     <string name="keyboard_mode_url" msgid="1519819835514911218">"I-URL"</string>
     <string name="voice_input" msgid="3583258583521397548">"Inkinobho yokufaka izwi"</string>
-    <string name="voice_input_modes_main_keyboard" msgid="3360660341121083174">"Kwikhibhodi eyisisekelo"</string>
-    <string name="voice_input_modes_symbols_keyboard" msgid="7203213240786084067">"Ikhibhodi yezimpawu"</string>
-    <string name="voice_input_modes_off" msgid="3745699748218082014">"VALIWE"</string>
-    <string name="voice_input_modes_summary_main_keyboard" msgid="6586544292900314339">"I-mic kwikhibhodi eyisisekelo"</string>
-    <string name="voice_input_modes_summary_symbols_keyboard" msgid="5233725927281932391">"Ikhibhodi yezimpawu ze-mic"</string>
-    <string name="voice_input_modes_summary_off" msgid="63875609591897607">"Okufakwayo ngezwi kuvinjelwe"</string>
+    <!-- no translation found for voice_input_disabled_summary (8141750303464726129) -->
+    <skip />
     <string name="configure_input_method" msgid="373356270290742459">"Misa izindlela zokufakwayo"</string>
     <string name="language_selection_title" msgid="1651299598555326750">"Izilimi zokufakwayo"</string>
     <string name="send_feedback" msgid="1780431884109392046">"Thumela impendulo"</string>
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 31945d0..a9474a0 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -26,14 +26,14 @@
         <attr name="keyboardViewStyle" format="reference" />
         <!-- MainKeyboardView style -->
         <attr name="mainKeyboardViewStyle" format="reference" />
+        <!-- Key preview text view style -->
+        <attr name="keyPreviewTextViewStyle" format="reference"/>
         <!-- EmojiPalettesView style -->
         <attr name="emojiPalettesViewStyle" format="reference" />
         <!-- MoreKeysKeyboard style -->
         <attr name="moreKeysKeyboardStyle" format="reference" />
         <!-- MoreKeysKeyboardView style -->
         <attr name="moreKeysKeyboardViewStyle" format="reference" />
-        <!-- MoreKeysKeyboardView container style -->
-        <attr name="moreKeysKeyboardContainerStyle" format="reference" />
         <!-- Suggestions strip style -->
         <attr name="suggestionStripViewStyle" format="reference" />
         <!-- Suggestion word style -->
@@ -41,9 +41,9 @@
     </declare-styleable>
 
     <declare-styleable name="KeyboardView">
-        <!-- Image for the key. This image needs to be a StateListDrawable, with the following
-             possible states: normal, pressed, checkable, checkable+pressed, checkable+checked,
-             checkable+checked+pressed. -->
+        <!-- Image for the key. This image needs to be a {@link StateListDrawable}, with the
+             following possible states: normal, pressed, checkable, checkable+pressed,
+             checkable+checked, checkable+checked+pressed. -->
         <attr name="keyBackground" format="reference" />
         <!-- Image for the functional key used in Emoji layout. -->
         <attr name="keyBackgroundEmojiFunctional" format="reference" />
@@ -72,9 +72,11 @@
         <attr name="autoCorrectionSpacebarLedEnabled" format="boolean" />
         <attr name="autoCorrectionSpacebarLedIcon" format="reference" />
         <!-- Size of the text for spacebar language label, in the proportion of key height. -->
-        <attr name="spacebarTextRatio" format="fraction" />
-        <attr name="spacebarTextColor" format="color" />
-        <attr name="spacebarTextShadowColor" format="color" />
+        <attr name="languageOnSpacebarTextRatio" format="fraction" />
+        <attr name="languageOnSpacebarTextColor" format="color" />
+        <attr name="languageOnSpacebarTextShadowColor" format="color" />
+        <!-- Background image for the spacebar. -->
+        <attr name="spacebarBackground" format="reference" />
         <!-- Fadeout animator for spacebar language label. -->
         <attr name="languageOnSpacebarFinalAlpha" format="integer" />
         <attr name="languageOnSpacebarFadeoutAnimator" format="reference" />
@@ -89,8 +91,8 @@
         <attr name="touchNoiseThresholdTime" format="integer" />
         <!-- Touch noise threshold distance in millimeter -->
         <attr name="touchNoiseThresholdDistance" format="dimension" />
-        <!-- Sliding key input enable -->
-        <attr name="slidingKeyInputEnable" format="boolean" />
+        <!-- Enable key selection by dragging finger -->
+        <attr name="keySelectionByDraggingFinger" format="boolean" />
         <attr name="slidingKeyInputPreviewColor" format="color" />
         <attr name="slidingKeyInputPreviewWidth" format="dimension" />
         <attr name="slidingKeyInputPreviewBodyRatio" format="integer" />
@@ -109,6 +111,10 @@
         <attr name="keyPreviewOffset" format="dimension" />
         <!-- Height of the key press feedback popup. -->
         <attr name="keyPreviewHeight" format="dimension" />
+        <!-- Duration of key preview popup zoom in animation in millisecond -->
+        <attr name="keyPreviewZoomInDuration" format="integer" />
+        <!-- Duration of key preview popup zoom out animation in millisecond -->
+        <attr name="keyPreviewZoomOutDuration" format="integer" />
         <!-- Delay after key releasing and key press feedback dismissing in millisecond -->
         <attr name="keyPreviewLingerTimeout" format="integer" />
         <!-- Layout resource for more keys keyboard -->
@@ -217,7 +223,6 @@
         <attr name="iconSearchKey" format="reference" />
         <attr name="iconTabKey" format="reference" />
         <attr name="iconShortcutKey" format="reference" />
-        <attr name="iconShortcutForLabel" format="reference" />
         <attr name="iconSpaceKeyForNumberLayout" format="reference" />
         <attr name="iconShiftKeyShifted" format="reference" />
         <attr name="iconShortcutKeyDisabled" format="reference" />
@@ -276,6 +281,8 @@
         <attr name="keyLabel" format="string" />
         <!-- The hint label to display on the key in conjunction with the label. -->
         <attr name="keyHintLabel" format="string" />
+        <!-- The vertical adjustment of key hint label in proportion to its height. -->
+        <attr name="keyHintLabelVerticalAdjustment" format="fraction" />
         <!-- The key label flags. -->
         <attr name="keyLabelFlags" format="integer">
             <!-- This should be aligned with Key.LABEL_FLAGS__* -->
@@ -292,17 +299,20 @@
             <flag name="hasPopupHint" value="0x200" />
             <flag name="hasShiftedLetterHint" value="0x400" />
             <flag name="hasHintLabel" value="0x800" />
+            <!-- These two flags are currently unused. Leave these for possible future use. -->
             <flag name="withIconLeft" value="0x1000" />
             <flag name="withIconRight" value="0x2000" />
             <flag name="autoXScale" value="0x4000" />
+            <!-- The autoScale value implies autoXScale bit on to optimize scaling code path. -->
+            <flag name="autoScale" value="0xc000" />
             <!-- If true, character case of code, altCode, moreKeys, keyOutputText, keyLabel,
                  or keyHintLabel will never be subject to change. -->
-            <flag name="preserveCase" value="0x8000" />
+            <flag name="preserveCase" value="0x10000" />
             <!-- If true, use keyShiftedLetterHintActivatedColor for the shifted letter hint and
                  keyTextInactivatedColor for the primary key top label. -->
-            <flag name="shiftedLetterActivated" value="0x10000" />
+            <flag name="shiftedLetterActivated" value="0x20000" />
             <!-- If true, use EditorInfo.actionLabel for the key label. -->
-            <flag name="fromCustomActionLabel" value="0x20000" />
+            <flag name="fromCustomActionLabel" value="0x40000" />
             <!-- If true, disable keyHintLabel. -->
             <flag name="disableKeyHintLabel" value="0x40000000" />
             <!-- If true, disable additionalMoreKeys. -->
@@ -415,8 +425,7 @@
         <attr name="navigatePrevious" format="boolean" />
         <attr name="passwordInput" format="boolean" />
         <attr name="clobberSettingsKey" format="boolean" />
-        <attr name="shortcutKeyEnabled" format="boolean" />
-        <attr name="shortcutKeyOnSymbols" format="boolean" />
+        <attr name="supportsSwitchingToShortcutIme" format="boolean" />
         <attr name="hasShortcutKey" format="boolean" />
         <attr name="languageSwitchKeyEnabled" format="boolean" />
         <attr name="isMultiLine" format="boolean" />
diff --git a/java/res/values/config-auto-correction-thresholds.xml b/java/res/values/config-auto-correction-thresholds.xml
new file mode 100644
index 0000000..7d94a42
--- /dev/null
+++ b/java/res/values/config-auto-correction-thresholds.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<resources>
+    <!-- The array of auto correction threshold values. -->
+    <string-array name="auto_correction_threshold_values" translatable="false">
+        <!-- Off, When auto correction setting is Off, this value is not used. -->
+        <item>floatMaxValue</item>
+        <!-- Modest : Suggestion whose normalized score is greater than this value
+             will be subject to auto-correction. -->
+        <item>0.185</item>
+        <!-- Aggressive -->
+        <item>0.067</item>
+        <!-- Very Aggressive : Suggestion whose normalized score is greater than this value
+             will be subject to auto-correction. "floatNegativeInfinity" is a special marker
+             string for Float.NEGATIVE_INFINITY -->
+        <item>floatNegativeInfinity</item>
+    </string-array>
+
+    <!-- The index of the auto correction threshold values array. -->
+    <string name="auto_correction_threshold_mode_index_off" translatable="false">0</string>
+    <string name="auto_correction_threshold_mode_index_modest" translatable="false">1</string>
+    <string name="auto_correction_threshold_mode_index_aggressive" translatable="false">2</string>
+    <string name="auto_correction_threshold_mode_index_very_aggressive" translatable="false">3</string>
+
+    <!-- The array of the auto correction threshold settings values. -->
+    <string-array name="auto_correction_threshold_mode_indexes" translatable="false">
+      <item>@string/auto_correction_threshold_mode_index_off</item>
+      <item>@string/auto_correction_threshold_mode_index_modest</item>
+      <item>@string/auto_correction_threshold_mode_index_aggressive</item>
+      <item>@string/auto_correction_threshold_mode_index_very_aggressive</item>
+    </string-array>
+    <!-- The array of the human readable auto correction threshold settings entries. -->
+    <string-array name="auto_correction_threshold_modes" translatable="false">
+      <item>@string/auto_correction_threshold_mode_off</item>
+      <item>@string/auto_correction_threshold_mode_modest</item>
+      <item>@string/auto_correction_threshold_mode_aggressive</item>
+      <item>@string/auto_correction_threshold_mode_very_aggressive</item>
+    </string-array>
+</resources>
diff --git a/java/res/values/config-common.xml b/java/res/values/config-common.xml
new file mode 100644
index 0000000..ab16a90
--- /dev/null
+++ b/java/res/values/config-common.xml
@@ -0,0 +1,142 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<resources>
+    <bool name="config_block_potentially_offensive">true</bool>
+    <!-- Default value for next word prediction: after entering a word and a space only, should we look
+         at input history to suggest a hopefully helpful suggestions for the next word? -->
+    <bool name="config_default_next_word_prediction">true</bool>
+
+    <!-- This configuration is an index of  {@link KeyboardSwitcher#KEYBOARD_THEMES[]}. -->
+    <string name="config_default_keyboard_theme_index" translatable="false">2</string>
+
+    <integer name="config_delay_update_shift_state">100</integer>
+    <integer name="config_double_space_period_timeout">1100</integer>
+
+    <integer name="config_key_repeat_start_timeout">400</integer>
+    <integer name="config_key_repeat_interval">50</integer>
+
+    <integer name="config_ignore_alt_code_key_timeout">350</integer>
+
+    <integer name="config_key_preview_zoom_in_duration">35</integer>
+    <integer name="config_key_preview_zoom_out_duration">40</integer>
+    <integer name="config_key_preview_linger_timeout">70</integer>
+    <!-- Suppress showing key preview duration after batch input in millisecond -->
+    <integer name="config_suppress_key_preview_after_batch_input_duration">1000</integer>
+
+    <bool name="config_default_vibration_enabled">true</bool>
+    <integer name="config_max_vibration_duration">100</integer>
+
+    <integer name="config_default_longpress_key_timeout">300</integer>
+    <integer name="config_max_longpress_timeout">700</integer>
+    <integer name="config_min_longpress_timeout">100</integer>
+    <integer name="config_longpress_timeout_step">10</integer>
+    <integer name="config_max_more_keys_column">5</integer>
+    <integer name="config_more_keys_keyboard_fadein_anim_time">0</integer>
+    <integer name="config_more_keys_keyboard_fadeout_anim_time">100</integer>
+
+    <!-- Long pressing shift will invoke caps-lock if > 0, never invoke caps-lock if == 0 -->
+    <integer name="config_longpress_shift_lock_timeout">1200</integer>
+
+    <!-- Sliding key input preview parameters -->
+    <dimen name="config_sliding_key_input_preview_width">8.0dp</dimen>
+    <!-- Percentages of sliding key input preview body and shadow, in proportion to the width.
+         A negative value of the shadow ratio disables drawing shadow. -->
+    <!-- TODO: May use the shadow to alleviate rugged trail drawing. -->
+    <integer name="config_sliding_key_input_preview_body_ratio">100</integer>
+    <integer name="config_sliding_key_input_preview_shadow_ratio">-1</integer>
+    <dimen name="config_key_hysteresis_distance_for_sliding_modifier">8.0dp</dimen>
+
+    <integer name="config_language_on_spacebar_final_alpha">128</integer>
+    <dimen name="config_language_on_spacebar_horizontal_margin">1dp</dimen>
+
+    <integer name="config_gesture_floating_preview_text_linger_timeout">200</integer>
+    <integer name="config_gesture_trail_fadeout_start_delay">100</integer>
+    <integer name="config_gesture_trail_fadeout_duration">800</integer>
+    <integer name="config_gesture_trail_update_interval">20</integer>
+    <!-- Static threshold for gesture after fast typing (msec) -->
+    <integer name="config_gesture_static_time_threshold_after_fast_typing">500</integer>
+    <!-- Static threshold for starting gesture detection (keyWidth%/sec) -->
+    <fraction name="config_gesture_detect_fast_move_speed_threshold">150%</fraction>
+    <!-- Dynamic threshold for gesture after fast typing (msec) -->
+    <integer name="config_gesture_dynamic_threshold_decay_duration">450</integer>
+    <!-- Time based threshold values for gesture detection (msec) -->
+    <integer name="config_gesture_dynamic_time_threshold_from">300</integer>
+    <integer name="config_gesture_dynamic_time_threshold_to">20</integer>
+    <!-- Distance based threshold values for gesture detection (keyWidth%/sec) -->
+    <fraction name="config_gesture_dynamic_distance_threshold_from">600%</fraction>
+    <fraction name="config_gesture_dynamic_distance_threshold_to">50%</fraction>
+    <!-- Parameter for gesture sampling (keyWidth%/sec) -->
+    <fraction name="config_gesture_sampling_minimum_distance">16.6666%</fraction>
+    <!-- Parameters for gesture recognition (msec) and (keyWidth%/sec) -->
+    <integer name="config_gesture_recognition_minimum_time">100</integer>
+    <integer name="config_gesture_recognition_update_time">100</integer>
+    <fraction name="config_gesture_recognition_speed_threshold">550%</fraction>
+
+    <integer name="config_keyboard_grid_width">32</integer>
+    <integer name="config_keyboard_grid_height">16</integer>
+    <dimen name="config_touch_noise_threshold_distance">12.6dp</dimen>
+    <integer name="config_touch_noise_threshold_time">40</integer>
+
+    <!-- Common keyboard configuration. -->
+    <fraction name="config_keyboard_left_padding">0%p</fraction>
+    <fraction name="config_keyboard_right_padding">0%p</fraction>
+    <dimen name="config_keyboard_vertical_correction">0.0dp</dimen>
+
+    <!-- Common key top visual configuration. -->
+    <dimen name="config_key_popup_hint_letter_padding">2dp</dimen>
+
+    <!-- Common suggestion strip configuration. -->
+    <integer name="config_suggestions_count_in_strip">3</integer>
+    <fraction name="config_center_suggestion_percentile">36%</fraction>
+    <integer name="config_delay_update_suggestions">100</integer>
+    <integer name="config_delay_update_old_suggestions">300</integer>
+
+    <!-- Common more suggestions configuraion. -->
+    <dimen name="config_more_suggestions_key_horizontal_padding">12dp</dimen>
+    <dimen name="config_more_suggestions_bottom_gap">6dp</dimen>
+    <dimen name="config_more_suggestions_modal_tolerance">32.0dp</dimen>
+    <fraction name="config_more_suggestions_info_ratio">18%</fraction>
+
+    <!-- Common gesture trail parameters -->
+    <!-- Minimum distance between gesture trail sampling points. -->
+    <dimen name="config_gesture_trail_min_sampling_distance">9.6dp</dimen>
+    <!-- Maximum angular threshold between gesture trails interpolation segments in degree. -->
+    <integer name="config_gesture_trail_max_interpolation_angular_threshold">15</integer>
+    <!-- Maximum distance threshold between gesture trails interpolation segments. -->
+    <dimen name="config_gesture_trail_max_interpolation_distance_threshold">16.0dp</dimen>
+    <!-- Maximum number of gesture trail interpolation segments. -->
+    <integer name="config_gesture_trail_max_interpolation_segments">6</integer>
+    <dimen name="config_gesture_trail_start_width">10.0dp</dimen>
+    <dimen name="config_gesture_trail_end_width">2.5dp</dimen>
+    <!-- Percentages of gesture preview taril body and shadow, in proportion to the trail width.
+         A negative value of the shadow ratio disables drawing shadow. -->
+    <!-- TODO: May use the shadow to alleviate rugged trail drawing. -->
+    <integer name="config_gesture_trail_body_ratio">100</integer>
+    <integer name="config_gesture_trail_shadow_ratio">-1</integer>
+
+    <!-- Common configuration of Emoji keyboard -->
+    <dimen name="config_emoji_category_page_id_height">3dp</dimen>
+
+    <!-- Inset used in Accessibility mode to avoid accidental key presses when a finger slides off the screen. -->
+    <dimen name="config_accessibility_edge_slop">8dp</dimen>
+
+    <integer name="config_user_dictionary_max_word_length">48</integer>
+</resources>
diff --git a/java/res/values/config-dictionary-pack.xml b/java/res/values/config-dictionary-pack.xml
new file mode 100644
index 0000000..d076af4
--- /dev/null
+++ b/java/res/values/config-dictionary-pack.xml
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<!-- Configuration values for Dictionary pack. -->
+<resources>
+    <!-- Settings for the dictionary pack -->
+    <bool name="allow_over_metered">false</bool>
+    <bool name="allow_over_roaming">false</bool>
+    <bool name="dict_downloads_visible_in_download_UI">false</bool>
+    <bool name="metadata_downloads_visible_in_download_UI">false</bool>
+    <bool name="display_notification_for_auto_update">false</bool>
+    <bool name="display_notification_for_user_requested_update">false</bool>
+</resources>
diff --git a/java/res/values/config-per-form-factor.xml b/java/res/values/config-per-form-factor.xml
new file mode 100644
index 0000000..67fc751
--- /dev/null
+++ b/java/res/values/config-per-form-factor.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<!-- Configuration values for Small Phone. -->
+<resources>
+    <bool name="config_enable_show_key_preview_popup_option">true</bool>
+    <!-- Whether or not Popup on key press is enabled by default -->
+    <bool name="config_default_key_preview_popup">true</bool>
+    <bool name="config_default_sound_enabled">false</bool>
+    <bool name="config_enable_show_voice_key_option">true</bool>
+    <bool name="config_key_selection_by_dragging_finger">true</bool>
+    <!-- Showing more keys keyboard, just above the touched point if true, aligned to the key if
+         false -->
+    <bool name="config_show_more_keys_keyboard_at_touched_point">false</bool>
+</resources>
diff --git a/java/res/values-sw540dp-land/config.xml b/java/res/values/config-screen-metrics.xml
similarity index 77%
rename from java/res/values-sw540dp-land/config.xml
rename to java/res/values/config-screen-metrics.xml
index b3cd727..9962994 100644
--- a/java/res/values-sw540dp-land/config.xml
+++ b/java/res/values/config-screen-metrics.xml
@@ -2,7 +2,7 @@
 <!--
 /*
 **
-** Copyright 2011, The Android Open Source Project
+** Copyright 2013, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
@@ -19,5 +19,6 @@
 -->
 
 <resources>
-    <bool name="config_use_fullscreen_mode">false</bool>
+    <!-- Must be aligned with {@link Constants#SCREEN_METRICS_SMALL_PHONE}. -->
+    <integer name="config_screen_metrics">0</integer>
 </resources>
diff --git a/java/res/values/config-spacing-and-punctuations.xml b/java/res/values/config-spacing-and-punctuations.xml
new file mode 100644
index 0000000..f10f810
--- /dev/null
+++ b/java/res/values/config-spacing-and-punctuations.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <!-- TODO: these settings depend on the language. They should be put either in the dictionary
+         header, or in the subtype maybe? -->
+    <!-- Symbols that are suggested between words -->
+    <string name="suggested_punctuations" translatable="false">!,?,\\,,:,;,\",(,),\',-,/,@,_</string>
+    <!-- Symbols that are normally preceded by a space (used to add an auto-space before these) -->
+    <string name="symbols_preceded_by_space" translatable="false">([{&amp;</string>
+    <!-- Symbols that are normally followed by a space (used to add an auto-space after these) -->
+    <string name="symbols_followed_by_space" translatable="false">.,;:!?)]}&amp;</string>
+    <!-- Symbols that separate words -->
+    <!-- Don't remove the enclosing double quotes, they protect whitespace (not just U+0020) -->
+    <string name="symbols_word_separators" translatable="false">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"</string>
+    <!-- Word connectors -->
+    <string name="symbols_word_connectors" translatable="false">\'-</string>
+    <!-- The sentence separator code point, for capitalization -->
+    <!-- U+002E: "." FULL STOP   ; 2Eh = 46d -->
+    <integer name="sentence_separator" translatable="false">46</integer>
+    <!-- Whether this language uses spaces between words -->
+    <bool name="current_language_has_spaces">true</bool>
+</resources>
diff --git a/java/res/layout/key_preview_klp.xml b/java/res/values/config-spellchecker-thresholds.xml
similarity index 70%
copy from java/res/layout/key_preview_klp.xml
copy to java/res/values/config-spellchecker-thresholds.xml
index 160aeb9..e99ba66 100644
--- a/java/res/layout/key_preview_klp.xml
+++ b/java/res/values/config-spellchecker-thresholds.xml
@@ -18,10 +18,8 @@
 */
 -->
 
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:background="@drawable/keyboard_key_feedback_klp"
-    android:minWidth="32dp"
-    android:gravity="center"
-/>
+<resources>
+    <!-- Threshold of the normalized score of the best suggestion for the spell checker to declare
+         a word to be "recommended" -->
+    <string name="spellchecker_recommended_threshold_value" translatable="false">0.11</string>
+</resources>
diff --git a/java/res/values/config.xml b/java/res/values/config.xml
index 61779d4..e64b4b1 100644
--- a/java/res/values/config.xml
+++ b/java/res/values/config.xml
@@ -18,120 +18,79 @@
 */
 -->
 
+<!-- Configuration values for Small Phone Portrait. -->
 <resources>
     <bool name="config_use_fullscreen_mode">false</bool>
-    <bool name="config_enable_show_voice_key_option">true</bool>
-    <bool name="config_enable_show_option_of_key_preview_popup">true</bool>
-    <!-- TODO: Disable the following configuration for production. -->
-    <bool name="config_enable_usability_study_mode_option">true</bool>
-    <!-- Whether or not Popup on key press is enabled by default -->
-    <bool name="config_default_key_preview_popup">true</bool>
-    <!-- Default value for next word prediction: after entering a word and a space only, should we look
-         at input history to suggest a hopefully helpful suggestions for the next word? -->
-    <bool name="config_default_next_word_prediction">true</bool>
-    <bool name="config_default_sound_enabled">false</bool>
-    <bool name="config_default_vibration_enabled">true</bool>
-    <integer name="config_max_vibration_duration">100</integer> <!-- milliseconds -->
-    <integer name="config_delay_update_suggestions">100</integer>
-    <integer name="config_delay_update_old_suggestions">300</integer>
-    <integer name="config_delay_update_shift_state">100</integer>
-    <integer name="config_language_on_spacebar_final_alpha">128</integer>
-    <integer name="config_more_keys_keyboard_fadein_anim_time">0</integer>
-    <integer name="config_more_keys_keyboard_fadeout_anim_time">100</integer>
-    <integer name="config_keyboard_grid_width">32</integer>
-    <integer name="config_keyboard_grid_height">16</integer>
-    <integer name="config_double_space_period_timeout">1100</integer>
-    <!-- This configuration is an index of  {@link KeyboardSwitcher#KEYBOARD_THEMES[]}. -->
-    <string name="config_default_keyboard_theme_index" translatable="false">2</string>
-    <integer name="config_max_more_keys_column">5</integer>
 
-    <!--
-         Configuration for MainKeyboardView
-    -->
     <dimen name="config_key_hysteresis_distance">8.0dp</dimen>
-    <dimen name="config_key_hysteresis_distance_for_sliding_modifier">8.0dp</dimen>
-    <integer name="config_touch_noise_threshold_time">40</integer>
-    <dimen name="config_touch_noise_threshold_distance">12.6dp</dimen>
-    <integer name="config_key_preview_linger_timeout">70</integer>
-    <bool name="config_sliding_key_input_enabled">true</bool>
-    <!-- Sliding key input preview parameters -->
-    <dimen name="config_sliding_key_input_preview_width">8.0dp</dimen>
-    <!-- Percentages of sliding key input preview body and shadow, in proportion to the width.
-         A negative value of the shadow ratio disables drawing shadow. -->
-    <!-- TODO: May use the shadow to alleviate rugged trail drawing. -->
-    <integer name="config_sliding_key_input_preview_body_ratio">100</integer>
-    <integer name="config_sliding_key_input_preview_shadow_ratio">-1</integer>
-    <integer name="config_key_repeat_start_timeout">400</integer>
-    <integer name="config_key_repeat_interval">50</integer>
-    <integer name="config_default_longpress_key_timeout">300</integer>  <!-- milliseconds -->
-    <integer name="config_longpress_timeout_step">10</integer> <!-- milliseconds -->
-    <integer name="config_min_longpress_timeout">100</integer> <!-- milliseconds -->
-    <integer name="config_max_longpress_timeout">700</integer> <!-- milliseconds -->
-    <!-- Long pressing shift will invoke caps-lock if > 0, never invoke caps-lock if == 0 -->
-    <integer name="config_longpress_shift_lock_timeout">1200</integer> <!-- milliseconds -->
-    <integer name="config_ignore_alt_code_key_timeout">350</integer> <!-- milliseconds -->
-    <!-- Showing more keys keyboard, just above the touched point if true, aligned to the key if
-         false -->
-    <bool name="config_show_more_keys_keyboard_at_touched_point">false</bool>
-    <bool name="config_block_potentially_offensive">true</bool>
-    <integer name="config_gesture_floating_preview_text_linger_timeout">200</integer>
-    <integer name="config_gesture_trail_fadeout_start_delay">100</integer>
-    <integer name="config_gesture_trail_fadeout_duration">800</integer>
-    <integer name="config_gesture_trail_update_interval">20</integer>
-    <!-- Static threshold for gesture after fast typing (msec) -->
-    <integer name="config_gesture_static_time_threshold_after_fast_typing">500</integer>
-    <!-- Static threshold for starting gesture detection (keyWidth%/sec) -->
-    <fraction name="config_gesture_detect_fast_move_speed_threshold">150%</fraction>
-    <!-- Dynamic threshold for gesture after fast typing (msec) -->
-    <integer name="config_gesture_dynamic_threshold_decay_duration">450</integer>
-    <!-- Time based threshold values for gesture detection (msec) -->
-    <integer name="config_gesture_dynamic_time_threshold_from">300</integer>
-    <integer name="config_gesture_dynamic_time_threshold_to">20</integer>
-    <!-- Distance based threshold values for gesture detection (keyWidth%/sec) -->
-    <fraction name="config_gesture_dynamic_distance_threshold_from">600%</fraction>
-    <fraction name="config_gesture_dynamic_distance_threshold_to">50%</fraction>
-    <!-- Parameter for gesture sampling (keyWidth%/sec) -->
-    <fraction name="config_gesture_sampling_minimum_distance">16.6666%</fraction>
-    <!-- Parameters for gesture recognition (msec) and (keyWidth%/sec) -->
-    <integer name="config_gesture_recognition_minimum_time">100</integer>
-    <integer name="config_gesture_recognition_update_time">100</integer>
-    <fraction name="config_gesture_recognition_speed_threshold">550%</fraction>
-    <!-- Suppress showing key preview duration after batch input in millisecond -->
-    <integer name="config_suppress_key_preview_after_batch_input_duration">1000</integer>
-    <!--
-        Configuration for auto correction
-     -->
-    <string-array name="auto_correction_threshold_values" translatable="false">
-        <!-- Off, When auto correction setting is Off, this value is not used. -->
-        <item>floatMaxValue</item>
-        <!-- Modest : Suggestion whose normalized score is greater than this value
-             will be subject to auto-correction. -->
-        <item>0.185</item>
-        <!-- Aggressive -->
-        <item>0.067</item>
-        <!-- Very Aggressive : Suggestion whose normalized score is greater than this value
-             will be subject to auto-correction. "floatNegativeInfinity" is a special marker
-             string for Float.NEGATIVE_INFINITY -->
-        <item>floatNegativeInfinity</item>
-    </string-array>
-    <!-- Threshold of the normalized score of the best suggestion for the spell checker to declare
-         a word to be "recommended" -->
-    <string name="spellchecker_recommended_threshold_value" translatable="false">0.11</string>
-    <!--  Screen metrics for logging.
-            0 = "mdpi phone screen"
-            1 = "hdpi phone screen"
-            2 = "mdpi 11 inch tablet screen"
-            3 = "xhdpi phone screen?"
-            4 = ?
-    -->
-    <integer name="log_screen_metrics">0</integer>
 
-    <!-- Settings for the dictionary pack -->
-    <bool name="allow_over_metered">false</bool>
-    <bool name="allow_over_roaming">false</bool>
-    <bool name="dict_downloads_visible_in_download_UI">false</bool>
-    <bool name="metadata_downloads_visible_in_download_UI">false</bool>
-    <bool name="display_notification_for_auto_update">false</bool>
-    <bool name="display_notification_for_user_requested_update">false</bool>
+    <!-- Preferable keyboard height in absolute scale: 1.285in -->
+    <!-- This config_default_keyboard_height value should match with keyboard-heights.xml -->
+    <dimen name="config_default_keyboard_height">205.6dp</dimen>
+    <fraction name="config_max_keyboard_height">46%p</fraction>
+    <fraction name="config_min_keyboard_height">-61.8%p</fraction>
 
+    <dimen name="config_more_keys_keyboard_key_height">52.8dp</dimen>
+    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
+    <!-- config_more_keys_keyboard_key_height x 1.2 -->
+    <dimen name="config_more_keys_keyboard_slide_allowance">63.36dp</dimen>
+    <dimen name="config_more_keys_keyboard_key_horizontal_padding">8dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_gb">1.556%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_gb">4.669%p</fraction>
+    <fraction name="config_key_vertical_gap_gb">6.495%p</fraction>
+    <fraction name="config_key_horizontal_gap_gb">1.971%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -1.0 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_gb">-52.8dp</dimen>
+    <dimen name="config_key_preview_offset_gb">-8.0dp</dimen>
+
+    <fraction name="config_keyboard_top_padding_holo">2.335%p</fraction>
+    <fraction name="config_keyboard_bottom_padding_holo">4.669%p</fraction>
+    <fraction name="config_key_vertical_gap_holo">6.127%p</fraction>
+    <fraction name="config_key_horizontal_gap_holo">1.739%p</fraction>
+    <!-- config_more_keys_keyboard_key_height x -0.5 -->
+    <dimen name="config_more_keys_keyboard_vertical_correction_holo">-26.4dp</dimen>
+    <dimen name="config_key_preview_offset_holo">8.0dp</dimen>
+
+    <dimen name="config_key_preview_height">80dp</dimen>
+    <fraction name="config_key_preview_text_ratio">82%</fraction>
+    <fraction name="config_key_letter_ratio">55%</fraction>
+    <fraction name="config_key_large_letter_ratio">65%</fraction>
+    <fraction name="config_key_label_ratio">34%</fraction>
+    <fraction name="config_key_large_label_ratio">40%</fraction>
+    <fraction name="config_key_hint_letter_ratio">25%</fraction>
+    <fraction name="config_key_hint_label_ratio">44%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio">35%</fraction>
+    <fraction name="config_language_on_spacebar_text_ratio">33.735%</fraction>
+    <dimen name="config_key_label_horizontal_padding">4dp</dimen>
+    <dimen name="config_key_hint_letter_padding">1dp</dimen>
+    <dimen name="config_key_shifted_letter_hint_padding">2dp</dimen>
+
+    <!-- For 5-row keyboard -->
+    <fraction name="config_key_vertical_gap_5row">3.20%p</fraction>
+    <fraction name="config_key_letter_ratio_5row">64%</fraction>
+    <fraction name="config_key_shifted_letter_hint_ratio_5row">41%</fraction>
+
+    <dimen name="config_suggestions_strip_height">40dp</dimen>
+    <dimen name="config_more_suggestions_row_height">40dp</dimen>
+    <integer name="config_max_more_suggestions_row">6</integer>
+    <fraction name="config_min_more_suggestions_width">90%</fraction>
+    <dimen name="config_suggestions_strip_horizontal_padding">0dp</dimen>
+    <dimen name="config_suggestion_min_width">44dp</dimen>
+    <dimen name="config_suggestion_text_horizontal_padding">6dp</dimen>
+    <dimen name="config_suggestion_text_size">18dp</dimen>
+    <dimen name="config_more_suggestions_hint_text_size">27dp</dimen>
+
+    <!-- Gesture floating preview text parameters -->
+    <dimen name="config_gesture_floating_preview_text_size">24dp</dimen>
+    <dimen name="config_gesture_floating_preview_text_offset">73dp</dimen>
+    <dimen name="config_gesture_floating_preview_horizontal_padding">24dp</dimen>
+    <dimen name="config_gesture_floating_preview_vertical_padding">16dp</dimen>
+    <dimen name="config_gesture_floating_preview_round_radius">2dp</dimen>
+
+    <!-- Emoji keyboard -->
+    <fraction name="config_emoji_keyboard_key_width">14.2857%p</fraction>
+    <fraction name="config_emoji_keyboard_row_height">33%p</fraction>
+    <fraction name="config_emoji_keyboard_key_letter_size">68%p</fraction>
+    <integer name="config_emoji_keyboard_max_page_key_count">21</integer>
 </resources>
diff --git a/java/res/values/dimens.xml b/java/res/values/dimens.xml
deleted file mode 100644
index 4588b10..0000000
--- a/java/res/values/dimens.xml
+++ /dev/null
@@ -1,132 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2008, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<resources>
-    <!-- Preferable keyboard height in absolute scale: 1.285in -->
-    <!-- This keyboardHeight value should match with keyboard-heights.xml -->
-    <dimen name="keyboardHeight">205.6dp</dimen>
-    <fraction name="maxKeyboardHeight">46%p</fraction>
-    <fraction name="minKeyboardHeight">-61.8%p</fraction>
-
-    <dimen name="popup_key_height">52.8dp</dimen>
-
-    <dimen name="more_keys_keyboard_key_horizontal_padding">8dp</dimen>
-
-    <fraction name="keyboard_left_padding">0%p</fraction>
-    <fraction name="keyboard_right_padding">0%p</fraction>
-
-    <fraction name="keyboard_top_padding_gb">1.556%p</fraction>
-    <fraction name="keyboard_bottom_padding_gb">4.669%p</fraction>
-    <fraction name="key_bottom_gap_gb">6.495%p</fraction>
-    <fraction name="key_horizontal_gap_gb">1.971%p</fraction>
-
-    <fraction name="keyboard_top_padding_holo">2.335%p</fraction>
-    <fraction name="keyboard_bottom_padding_holo">4.669%p</fraction>
-    <fraction name="key_bottom_gap_holo">6.127%p</fraction>
-    <fraction name="key_horizontal_gap_holo">1.739%p</fraction>
-
-    <!-- Amount of allowance for selecting keys in a mini popup keyboard by sliding finger. -->
-    <!-- popup_key_height x 1.2 -->
-    <dimen name="more_keys_keyboard_slide_allowance">63.36dp</dimen>
-    <!-- popup_key_height x -1.0 -->
-    <dimen name="more_keys_keyboard_vertical_correction_gb">-52.8dp</dimen>
-    <dimen name="keyboard_vertical_correction">0.0dp</dimen>
-
-    <fraction name="key_letter_ratio">55%</fraction>
-    <fraction name="key_large_letter_ratio">65%</fraction>
-    <fraction name="key_label_ratio">34%</fraction>
-    <fraction name="key_large_label_ratio">40%</fraction>
-    <fraction name="key_hint_letter_ratio">25%</fraction>
-    <fraction name="key_hint_label_ratio">44%</fraction>
-    <fraction name="key_uppercase_letter_ratio">35%</fraction>
-    <fraction name="key_preview_text_ratio">82%</fraction>
-    <fraction name="spacebar_text_ratio">33.735%</fraction>
-    <dimen name="key_preview_height">80dp</dimen>
-    <dimen name="key_preview_offset_gb">-8.0dp</dimen>
-
-    <dimen name="key_label_horizontal_padding">4dp</dimen>
-    <dimen name="key_hint_letter_padding">1dp</dimen>
-    <dimen name="key_popup_hint_letter_padding">2dp</dimen>
-    <dimen name="key_uppercase_letter_padding">2dp</dimen>
-
-    <!-- For 5-row keyboard -->
-    <fraction name="key_bottom_gap_5row">3.20%p</fraction>
-    <fraction name="key_letter_ratio_5row">64%</fraction>
-    <fraction name="key_uppercase_letter_ratio_5row">41%</fraction>
-
-    <dimen name="key_preview_offset_holo">8.0dp</dimen>
-    <!-- popup_key_height x -0.5 -->
-    <dimen name="more_keys_keyboard_vertical_correction_holo">-26.4dp</dimen>
-
-    <dimen name="suggestions_strip_height">40dp</dimen>
-    <dimen name="more_suggestions_key_horizontal_padding">12dp</dimen>
-    <dimen name="more_suggestions_row_height">40dp</dimen>
-    <dimen name="more_suggestions_bottom_gap">6dp</dimen>
-    <dimen name="more_suggestions_modal_tolerance">32.0dp</dimen>
-    <dimen name="more_suggestions_slide_allowance">16.0dp</dimen>
-    <integer name="max_more_suggestions_row">6</integer>
-    <fraction name="min_more_suggestions_width">90%</fraction>
-    <fraction name="more_suggestions_info_ratio">18%</fraction>
-    <dimen name="suggestions_strip_padding">0dp</dimen>
-    <dimen name="suggestion_min_width">44dp</dimen>
-    <dimen name="suggestion_padding">6dp</dimen>
-    <dimen name="suggestion_text_size">18dp</dimen>
-    <dimen name="more_suggestions_hint_text_size">27dp</dimen>
-    <integer name="suggestions_count_in_strip">3</integer>
-    <fraction name="center_suggestion_percentile">36%</fraction>
-
-    <!-- Gesture trail parameters -->
-    <!-- Minimum distance between gesture trail sampling points. -->
-    <dimen name="gesture_trail_min_sampling_distance">9.6dp</dimen>
-    <!-- Maximum angular threshold between gesture trails interpolation segments in degree. -->
-    <integer name="gesture_trail_max_interpolation_angular_threshold">15</integer>
-    <!-- Maximum distance threshold between gesture trails interpolation segments. -->
-    <dimen name="gesture_trail_max_interpolation_distance_threshold">16.0dp</dimen>
-    <!-- Maximum number of gesture trail interpolation segments. -->
-    <integer name="gesture_trail_max_interpolation_segments">6</integer>
-    <dimen name="gesture_trail_start_width">10.0dp</dimen>
-    <dimen name="gesture_trail_end_width">2.5dp</dimen>
-    <!-- Percentages of gesture preview taril body and shadow, in proportion to the trail width.
-         A negative value of the shadow ratio disables drawing shadow. -->
-    <!-- TODO: May use the shadow to alleviate rugged trail drawing. -->
-    <integer name="gesture_trail_body_ratio">100</integer>
-    <integer name="gesture_trail_shadow_ratio">-1</integer>
-    <!-- Gesture floating preview text parameters -->
-    <dimen name="gesture_floating_preview_text_size">24dp</dimen>
-    <dimen name="gesture_floating_preview_text_offset">73dp</dimen>
-    <dimen name="gesture_floating_preview_horizontal_padding">24dp</dimen>
-    <dimen name="gesture_floating_preview_vertical_padding">16dp</dimen>
-    <dimen name="gesture_floating_preview_round_radius">2dp</dimen>
-
-    <!-- Emoji keyboard -->
-    <fraction name="emoji_keyboard_key_width">14.2857%p</fraction>
-    <fraction name="emoji_keyboard_row_height">33%p</fraction>
-    <fraction name="emoji_keyboard_key_letter_size">68%p</fraction>
-    <integer name="emoji_keyboard_max_key_count">21</integer>
-    <dimen name="emoji_category_page_id_height">3dp</dimen>
-
-    <!-- Inset used in Accessibility mode to avoid accidental key presses when a finger slides off the screen. -->
-    <dimen name="accessibility_edge_slop">8dp</dimen>
-
-    <integer name="user_dictionary_max_word_length" translatable="false">48</integer>
-
-    <dimen name="language_on_spacebar_horizontal_margin">1dp</dimen>
-
-</resources>
diff --git a/java/res/values/donottranslate.xml b/java/res/values/donottranslate.xml
index af5ec06..4be5863 100644
--- a/java/res/values/donottranslate.xml
+++ b/java/res/values/donottranslate.xml
@@ -18,25 +18,6 @@
 */
 -->
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
-    <!-- TODO: these settings depend on the language. They should be put either in the dictionary
-         header, or in the subtype maybe? -->
-    <!-- Symbols that are suggested between words -->
-    <string name="suggested_punctuations">!,?,\\,,:,;,\",(,),\',-,/,@,_</string>
-    <!-- Symbols that are normally preceded by a space (used to add an auto-space before these) -->
-    <string name="symbols_preceded_by_space">([{&amp;</string>
-    <!-- Symbols that are normally followed by a space (used to add an auto-space after these) -->
-    <string name="symbols_followed_by_space">.,;:!?)]}&amp;</string>
-    <!-- Symbols that separate words -->
-    <!-- Don't remove the enclosing double quotes, they protect whitespace (not just U+0020) -->
-    <string name="symbols_word_separators">"&#x0009;&#x0020;\n"()[]{}*&amp;&lt;&gt;+=|.,;:!?/_\"</string>
-    <!-- Word connectors -->
-    <string name="symbols_word_connectors">\'-</string>
-    <!-- The sentence separator code point, for capitalization -->
-    <!-- U+002E: "." FULL STOP   ; 2Eh = 46d -->
-    <integer name="sentence_separator">46</integer>
-    <!-- Whether this language uses spaces between words -->
-    <bool name="current_language_has_spaces">true</bool>
-
     <!--  Always show the suggestion strip -->
     <string name="prefs_suggestion_visibility_show_value">0</string>
     <!--  Show the suggestion strip only on portrait mode -->
@@ -57,43 +38,9 @@
        <item>@string/prefs_suggestion_visibility_hide_name</item>
     </string-array>
 
-    <string name="auto_correction_threshold_mode_index_off">0</string>
-    <string name="auto_correction_threshold_mode_index_modest">1</string>
-    <string name="auto_correction_threshold_mode_index_aggressive">2</string>
-    <string name="auto_correction_threshold_mode_index_very_aggressive">3</string>
-    <string-array name="auto_correction_threshold_mode_indexes">
-      <item>@string/auto_correction_threshold_mode_index_off</item>
-      <item>@string/auto_correction_threshold_mode_index_modest</item>
-      <item>@string/auto_correction_threshold_mode_index_aggressive</item>
-      <item>@string/auto_correction_threshold_mode_index_very_aggressive</item>
-    </string-array>
-    <string-array name="auto_correction_threshold_modes">
-      <item>@string/auto_correction_threshold_mode_off</item>
-      <item>@string/auto_correction_threshold_mode_modest</item>
-      <item>@string/auto_correction_threshold_mode_aggressive</item>
-      <item>@string/auto_correction_threshold_mode_very_aggressive</item>
-    </string-array>
-
+    <!-- For backward compatibility.
+         See {@link SettingsValues#needsToShowVoiceInputKey(SharedPreferences,Resources)} -->
     <string name="voice_mode_main">0</string>
-    <string name="voice_mode_symbols">1</string>
-    <string name="voice_mode_off">2</string>
-    <string-array name="voice_input_modes_values">
-        <item>@string/voice_mode_main</item>
-        <item>@string/voice_mode_symbols</item>
-        <item>@string/voice_mode_off</item>
-    </string-array>
-    <!-- Array of Voice Input modes -->
-    <string-array name="voice_input_modes">
-        <item>@string/voice_input_modes_main_keyboard</item>
-        <item>@string/voice_input_modes_symbols_keyboard</item>
-        <item>@string/voice_input_modes_off</item>
-    </string-array>
-    <!-- Array of Voice Input modes summary -->
-    <string-array name="voice_input_modes_summary">
-        <item>@string/voice_input_modes_summary_main_keyboard</item>
-        <item>@string/voice_input_modes_summary_symbols_keyboard</item>
-        <item>@string/voice_input_modes_summary_off</item>
-    </string-array>
 
     <!-- Title for Latin keyboard debug settings activity / dialog -->
     <string name="english_ime_debug_settings">Android keyboard Debug settings</string>
diff --git a/java/res/values/keyboard-icons-holo.xml b/java/res/values/keyboard-icons-holo.xml
index b49e1d1..4c888d5 100644
--- a/java/res/values/keyboard-icons-holo.xml
+++ b/java/res/values/keyboard-icons-holo.xml
@@ -32,7 +32,6 @@
         <item name="iconSearchKey">@drawable/sym_keyboard_search_holo_dark</item>
         <item name="iconTabKey">@drawable/sym_keyboard_tab_holo_dark</item>
         <item name="iconShortcutKey">@drawable/sym_keyboard_voice_holo_dark</item>
-        <item name="iconShortcutForLabel">@drawable/sym_keyboard_label_mic_holo_dark</item>
         <item name="iconSpaceKeyForNumberLayout">@drawable/sym_keyboard_space_holo_dark</item>
         <item name="iconShiftKeyShifted">@drawable/sym_keyboard_shift_locked_holo_dark</item>
         <item name="iconShortcutKeyDisabled">@drawable/sym_keyboard_voice_off_holo_dark</item>
diff --git a/java/res/values/strings.xml b/java/res/values/strings.xml
index 11b3ea3..8e8a13f 100644
--- a/java/res/values/strings.xml
+++ b/java/res/values/strings.xml
@@ -87,6 +87,11 @@
     <!-- Description for option enabling or disabling the use of names of people in Contacts for suggestion and correction [CHAR LIMIT=65] -->
     <string name="use_contacts_dict_summary">Use names from Contacts for suggestions and corrections</string>
 
+    <!-- Option name for enabling the use by the keyboards of sent/received messages, e-mail and typing history to improve suggestion accuracy [CHAR LIMIT=25] -->
+    <string name="use_personalized_dicts">Personalized suggestions</string>
+    <!-- Description for option enabling the use by the keyboards of sent/received messages, e-mail and typing history to improve suggestion accuracy [CHAR LIMIT=65] -->
+    <string name="use_personalized_dicts_summary">Learn from your communications and typed data to improve suggestions</string>
+
     <!-- Option name for enabling or disabling the double-space period feature that lets double tap on spacebar insert a period followed by a space [CHAR LIMIT=30] -->
     <string name="use_double_space_period">Double-space period</string>
     <!-- Description for option enabling or disabling the double-space period feature that lets double tap on spacebar insert a period followed by a space [CHAR LIMIT=65] -->
@@ -244,21 +249,8 @@
 
     <!-- Preferences item for enabling speech input -->
     <string name="voice_input">Voice input key</string>
-
-    <!-- Voice Input modes -->
-    <!-- On settings screen, voice input pop-up menu option to show voice key on main keyboard [CHAR LIMIT=20] -->
-    <string name="voice_input_modes_main_keyboard">On main keyboard</string>
-    <!-- On settings screen, voice input pop-up menu option to show voice key on symbols keyboard [CHAR LIMIT=20] -->
-    <string name="voice_input_modes_symbols_keyboard">On symbols keyboard</string>
-    <!-- On settings screen, voice input pop-up menu option to never show voice key [CHAR LIMIT=20] -->
-    <string name="voice_input_modes_off">Off</string>
-    <!-- Voice Input modes summary -->
-    <!-- On settings screen, voice input pop-up menu summary text to show voice key on main keyboard [CHAR LIMIT=20] -->
-    <string name="voice_input_modes_summary_main_keyboard">Mic on main keyboard</string>
-    <!-- On settings screen, voice input pop-up menu summary text to show voice key on symbols keyboard [CHAR LIMIT=20] -->
-    <string name="voice_input_modes_summary_symbols_keyboard">Mic on symbols keyboard</string>
-    <!-- On settings screen, voice input pop-up menu summary text to never show voice key [CHAR LIMIT=20] -->
-    <string name="voice_input_modes_summary_off">Voice input is disabled</string>
+    <!-- The summary text to describe the reason why the "Voice input key" option is disabled. [CHAR LIMIT=100] -->
+    <string name="voice_input_disabled_summary">No voice input methods enabled. Check Language &amp; input settings.</string>
 
     <!-- Title for configuring input method settings [CHAR LIMIT=35] -->
     <string name="configure_input_method">Configure input methods</string>
@@ -494,8 +486,6 @@
     <string name="prefs_read_external_dictionary">Read external dictionary file</string>
     <!-- Title of the settings for using only personalization dictionary -->
     <string name="prefs_use_only_personalization_dictionary" translatable="false">Use only personalization dictionary</string>
-    <!-- Title of the settings for boosting personalization dictionary -->
-    <string name="prefs_boost_personalization_dictionary" translatable="false">Boost personalization dictionary</string>
     <!-- Message to show when there are no files to install as an external dictionary [CHAR LIMIT=100] -->
     <string name="read_external_dictionary_no_files_message">No dictionary files in the Downloads folder</string>
     <!-- Title of the dialog that selects a file to install as an external dictionary [CHAR LIMIT=50] -->
diff --git a/java/res/values/themes-common.xml b/java/res/values/themes-common.xml
index 298936d..7c9b51c 100644
--- a/java/res/values/themes-common.xml
+++ b/java/res/values/themes-common.xml
@@ -25,49 +25,49 @@
         <item name="touchPositionCorrectionData">@array/touch_position_correction_data_default</item>
         <item name="rowHeight">25%p</item>
         <item name="moreKeysTemplate">@xml/kbd_more_keys_keyboard_template</item>
-        <item name="keyboardLeftPadding">@fraction/keyboard_left_padding</item>
-        <item name="keyboardRightPadding">@fraction/keyboard_right_padding</item>
+        <item name="keyboardLeftPadding">@fraction/config_keyboard_left_padding</item>
+        <item name="keyboardRightPadding">@fraction/config_keyboard_right_padding</item>
         <item name="maxMoreKeysColumn">@integer/config_max_more_keys_column</item>
     </style>
     <style name="KeyboardView">
         <item name="keyBackground">@drawable/btn_keyboard_key_klp</item>
-        <item name="keyLetterSize">@fraction/key_letter_ratio</item>
-        <item name="keyLargeLetterRatio">@fraction/key_large_letter_ratio</item>
-        <item name="keyLabelSize">@fraction/key_label_ratio</item>
-        <item name="keyLargeLabelRatio">@fraction/key_large_label_ratio</item>
-        <item name="keyHintLetterRatio">@fraction/key_hint_letter_ratio</item>
-        <item name="keyHintLabelRatio">@fraction/key_hint_label_ratio</item>
-        <item name="keyShiftedLetterHintRatio">@fraction/key_uppercase_letter_ratio</item>
+        <item name="keyLetterSize">@fraction/config_key_letter_ratio</item>
+        <item name="keyLargeLetterRatio">@fraction/config_key_large_letter_ratio</item>
+        <item name="keyLabelSize">@fraction/config_key_label_ratio</item>
+        <item name="keyLargeLabelRatio">@fraction/config_key_large_label_ratio</item>
+        <item name="keyHintLetterRatio">@fraction/config_key_hint_letter_ratio</item>
+        <item name="keyHintLabelRatio">@fraction/config_key_hint_label_ratio</item>
+        <item name="keyShiftedLetterHintRatio">@fraction/config_key_shifted_letter_hint_ratio</item>
         <item name="keyTypeface">normal</item>
-        <item name="keyLabelHorizontalPadding">@dimen/key_label_horizontal_padding</item>
-        <item name="keyHintLetterPadding">@dimen/key_hint_letter_padding</item>
-        <item name="keyPopupHintLetterPadding">@dimen/key_popup_hint_letter_padding</item>
-        <item name="keyShiftedLetterHintPadding">@dimen/key_uppercase_letter_padding</item>
-        <item name="keyPreviewTextRatio">@fraction/key_preview_text_ratio</item>
-        <item name="verticalCorrection">@dimen/keyboard_vertical_correction</item>
+        <item name="keyLabelHorizontalPadding">@dimen/config_key_label_horizontal_padding</item>
+        <item name="keyHintLetterPadding">@dimen/config_key_hint_letter_padding</item>
+        <item name="keyPopupHintLetterPadding">@dimen/config_key_popup_hint_letter_padding</item>
+        <item name="keyShiftedLetterHintPadding">@dimen/config_key_shifted_letter_hint_padding</item>
+        <item name="keyPreviewTextRatio">@fraction/config_key_preview_text_ratio</item>
+        <item name="verticalCorrection">@dimen/config_keyboard_vertical_correction</item>
         <item name="backgroundDimAlpha">128</item>
-        <item name="gestureFloatingPreviewTextSize">@dimen/gesture_floating_preview_text_size</item>
-        <item name="gestureFloatingPreviewTextOffset">@dimen/gesture_floating_preview_text_offset</item>
-        <item name="gestureFloatingPreviewHorizontalPadding">@dimen/gesture_floating_preview_horizontal_padding</item>
-        <item name="gestureFloatingPreviewVerticalPadding">@dimen/gesture_floating_preview_vertical_padding</item>
-        <item name="gestureFloatingPreviewRoundRadius">@dimen/gesture_floating_preview_round_radius</item>
-        <item name="gestureTrailMinSamplingDistance">@dimen/gesture_trail_min_sampling_distance</item>
-        <item name="gestureTrailMaxInterpolationAngularThreshold">@integer/gesture_trail_max_interpolation_angular_threshold</item>
-        <item name="gestureTrailMaxInterpolationDistanceThreshold">@dimen/gesture_trail_max_interpolation_distance_threshold</item>
-        <item name="gestureTrailMaxInterpolationSegments">@integer/gesture_trail_max_interpolation_segments</item>
+        <item name="gestureFloatingPreviewTextSize">@dimen/config_gesture_floating_preview_text_size</item>
+        <item name="gestureFloatingPreviewTextOffset">@dimen/config_gesture_floating_preview_text_offset</item>
+        <item name="gestureFloatingPreviewHorizontalPadding">@dimen/config_gesture_floating_preview_horizontal_padding</item>
+        <item name="gestureFloatingPreviewVerticalPadding">@dimen/config_gesture_floating_preview_vertical_padding</item>
+        <item name="gestureFloatingPreviewRoundRadius">@dimen/config_gesture_floating_preview_round_radius</item>
+        <item name="gestureTrailMinSamplingDistance">@dimen/config_gesture_trail_min_sampling_distance</item>
+        <item name="gestureTrailMaxInterpolationAngularThreshold">@integer/config_gesture_trail_max_interpolation_angular_threshold</item>
+        <item name="gestureTrailMaxInterpolationDistanceThreshold">@dimen/config_gesture_trail_max_interpolation_distance_threshold</item>
+        <item name="gestureTrailMaxInterpolationSegments">@integer/config_gesture_trail_max_interpolation_segments</item>
         <item name="gestureTrailFadeoutStartDelay">@integer/config_gesture_trail_fadeout_start_delay</item>
         <item name="gestureTrailFadeoutDuration">@integer/config_gesture_trail_fadeout_duration</item>
         <item name="gestureTrailUpdateInterval">@integer/config_gesture_trail_update_interval</item>
-        <item name="gestureTrailStartWidth">@dimen/gesture_trail_start_width</item>
-        <item name="gestureTrailEndWidth">@dimen/gesture_trail_end_width</item>
-        <item name="gestureTrailBodyRatio">@integer/gesture_trail_body_ratio</item>
-        <item name="gestureTrailShadowRatio">@integer/gesture_trail_shadow_ratio</item>
+        <item name="gestureTrailStartWidth">@dimen/config_gesture_trail_start_width</item>
+        <item name="gestureTrailEndWidth">@dimen/config_gesture_trail_end_width</item>
+        <item name="gestureTrailBodyRatio">@integer/config_gesture_trail_body_ratio</item>
+        <item name="gestureTrailShadowRatio">@integer/config_gesture_trail_shadow_ratio</item>
         <!-- Common attributes of MainKeyboardView -->
         <item name="keyHysteresisDistance">@dimen/config_key_hysteresis_distance</item>
         <item name="keyHysteresisDistanceForSlidingModifier">@dimen/config_key_hysteresis_distance_for_sliding_modifier</item>
         <item name="touchNoiseThresholdTime">@integer/config_touch_noise_threshold_time</item>
         <item name="touchNoiseThresholdDistance">@dimen/config_touch_noise_threshold_distance</item>
-        <item name="slidingKeyInputEnable">@bool/config_sliding_key_input_enabled</item>
+        <item name="keySelectionByDraggingFinger">@bool/config_key_selection_by_dragging_finger</item>
         <item name="slidingKeyInputPreviewWidth">@dimen/config_sliding_key_input_preview_width</item>
         <item name="slidingKeyInputPreviewBodyRatio">@integer/config_sliding_key_input_preview_body_ratio</item>
         <item name="slidingKeyInputPreviewShadowRatio">@integer/config_sliding_key_input_preview_shadow_ratio</item>
@@ -75,11 +75,14 @@
         <item name="keyRepeatInterval">@integer/config_key_repeat_interval</item>
         <item name="longPressShiftLockTimeout">@integer/config_longpress_shift_lock_timeout</item>
         <item name="ignoreAltCodeKeyTimeout">@integer/config_ignore_alt_code_key_timeout</item>
-        <item name="keyPreviewHeight">@dimen/key_preview_height</item>
+        <item name="keyPreviewLayout">@layout/key_preview</item>
+        <item name="keyPreviewHeight">@dimen/config_key_preview_height</item>
+        <item name="keyPreviewZoomInDuration">@integer/config_key_preview_zoom_in_duration</item>
+        <item name="keyPreviewZoomOutDuration">@integer/config_key_preview_zoom_out_duration</item>
         <item name="keyPreviewLingerTimeout">@integer/config_key_preview_linger_timeout</item>
         <item name="moreKeysKeyboardLayout">@layout/more_keys_keyboard</item>
         <item name="showMoreKeysKeyboardAtTouchedPoint">@bool/config_show_more_keys_keyboard_at_touched_point</item>
-        <item name="spacebarTextRatio">@fraction/spacebar_text_ratio</item>
+        <item name="languageOnSpacebarTextRatio">@fraction/config_language_on_spacebar_text_ratio</item>
         <item name="languageOnSpacebarFinalAlpha">@integer/config_language_on_spacebar_final_alpha</item>
         <item name="languageOnSpacebarFadeoutAnimator">@anim/language_on_spacebar_fadeout</item>
         <!-- Remove animations for now because it could drain a non-negligible amount of battery while typing.
@@ -104,6 +107,7 @@
     <style
         name="MainKeyboardView"
         parent="KeyboardView" />
+    <style name="KeyPreviewTextView" />
     <!-- Though {@link EmojiPalettesView} doesn't extend {@link KeyboardView}, some views inside it,
          for instance delete button, need themed {@link KeyboardView} attributes. -->
     <style
@@ -118,14 +122,14 @@
         parent="MainKeyboardView" />
     <style name="MoreKeysKeyboardContainer" />
     <style name="SuggestionStripView">
-        <item name="suggestionsCountInStrip">@integer/suggestions_count_in_strip</item>
-        <item name="centerSuggestionPercentile">@fraction/center_suggestion_percentile</item>
-        <item name="maxMoreSuggestionsRow">@integer/max_more_suggestions_row</item>
-        <item name="minMoreSuggestionsWidth">@fraction/min_more_suggestions_width</item>
+        <item name="suggestionsCountInStrip">@integer/config_suggestions_count_in_strip</item>
+        <item name="centerSuggestionPercentile">@fraction/config_center_suggestion_percentile</item>
+        <item name="maxMoreSuggestionsRow">@integer/config_max_more_suggestions_row</item>
+        <item name="minMoreSuggestionsWidth">@fraction/config_min_more_suggestions_width</item>
     </style>
     <style name="SuggestionWord" />
     <style name="MoreKeysKeyboardAnimation">
         <item name="android:windowEnterAnimation">@anim/more_keys_keyboard_fadein</item>
         <item name="android:windowExitAnimation">@anim/more_keys_keyboard_fadeout</item>
     </style>
-</resources>
\ No newline at end of file
+</resources>
diff --git a/java/res/values/themes-gb.xml b/java/res/values/themes-gb.xml
index f52695f..52ecafd 100644
--- a/java/res/values/themes-gb.xml
+++ b/java/res/values/themes-gb.xml
@@ -23,10 +23,10 @@
         <item name="keyboardStyle">@style/Keyboard.GB</item>
         <item name="keyboardViewStyle">@style/KeyboardView.GB</item>
         <item name="mainKeyboardViewStyle">@style/MainKeyboardView.GB</item>
+        <item name="keyPreviewTextViewStyle">@style/KeyPreviewTextView.GB</item>
         <item name="emojiPalettesViewStyle">@style/EmojiPalettesView.GB</item>
         <item name="moreKeysKeyboardStyle">@style/MoreKeysKeyboard.GB</item>
         <item name="moreKeysKeyboardViewStyle">@style/MoreKeysKeyboardView.GB</item>
-        <item name="moreKeysKeyboardContainerStyle">@style/MoreKeysKeyboardContainer.GB</item>
         <item name="suggestionStripViewStyle">@style/SuggestionStripView.GB</item>
         <item name="suggestionWordStyle">@style/SuggestionWord.GB</item>
     </style>
@@ -40,7 +40,6 @@
         <item name="iconSearchKey">@drawable/sym_keyboard_search_holo_dark</item>
         <item name="iconTabKey">@drawable/sym_keyboard_tab_holo_dark</item>
         <item name="iconShortcutKey">@drawable/sym_keyboard_mic_holo_dark</item>
-        <item name="iconShortcutForLabel">@drawable/sym_keyboard_label_mic_holo_dark</item>
         <item name="iconSpaceKeyForNumberLayout">@drawable/sym_keyboard_space</item>
         <item name="iconShiftKeyShifted">@drawable/sym_keyboard_shift_locked_holo_dark</item>
         <!-- TODO: Needs non-holo disabled shortcut icon drawable -->
@@ -59,10 +58,10 @@
         <!-- This should be aligned with KeyboardSwitcher.KEYBOARD_THEMES[] -->
         <item name="themeId">1</item>
         <item name="touchPositionCorrectionData">@array/touch_position_correction_data_gb</item>
-        <item name="keyboardTopPadding">@fraction/keyboard_top_padding_gb</item>
-        <item name="keyboardBottomPadding">@fraction/keyboard_bottom_padding_gb</item>
-        <item name="horizontalGap">@fraction/key_horizontal_gap_gb</item>
-        <item name="verticalGap">@fraction/key_bottom_gap_gb</item>
+        <item name="keyboardTopPadding">@fraction/config_keyboard_top_padding_gb</item>
+        <item name="keyboardBottomPadding">@fraction/config_keyboard_bottom_padding_gb</item>
+        <item name="horizontalGap">@fraction/config_key_horizontal_gap_gb</item>
+        <item name="verticalGap">@fraction/config_key_vertical_gap_gb</item>
     </style>
     <style
         name="KeyboardView.GB"
@@ -85,16 +84,22 @@
         name="MainKeyboardView.GB"
         parent="KeyboardView.GB"
     >
-        <item name="keyPreviewLayout">@layout/key_preview_gb</item>
-        <item name="keyPreviewOffset">@dimen/key_preview_offset_gb</item>
+        <item name="keyPreviewOffset">@dimen/config_key_preview_offset_gb</item>
         <item name="gestureFloatingPreviewTextColor">@color/highlight_color_gb</item>
         <item name="gestureFloatingPreviewColor">@color/gesture_floating_preview_color_gb</item>
         <item name="gestureTrailColor">@color/highlight_color_gb</item>
         <item name="slidingKeyInputPreviewColor">@color/highlight_translucent_color_gb</item>
         <item name="autoCorrectionSpacebarLedEnabled">true</item>
         <item name="autoCorrectionSpacebarLedIcon">@drawable/sym_keyboard_space_led_gb</item>
-        <item name="spacebarTextColor">@color/spacebar_text_color_gb</item>
-        <item name="spacebarTextShadowColor">@color/spacebar_text_shadow_color_gb</item>
+        <item name="languageOnSpacebarTextColor">@color/spacebar_text_color_gb</item>
+        <item name="languageOnSpacebarTextShadowColor">@color/spacebar_text_shadow_color_gb</item>
+        <item name="spacebarBackground">@drawable/btn_keyboard_spacebar_gb</item>
+    </style>
+    <style
+        name="KeyPreviewTextView.GB"
+        parent="KeyPreviewTextView"
+    >
+        <item name="android:background">@drawable/keyboard_key_feedback_gb</item>
     </style>
     <!-- Though {@link EmojiPalettesView} doesn't extend {@link KeyboardView}, some views inside it,
          for instance delete button, need themed {@link KeyboardView} attributes. -->
@@ -118,15 +123,10 @@
         name="MoreKeysKeyboardView.GB"
         parent="KeyboardView.GB"
     >
-        <item name="android:background">@null</item>
+        <item name="android:background">@drawable/keyboard_popup_panel_background_gb</item>
         <item name="keyBackground">@drawable/btn_keyboard_key_popup_gb</item>
         <item name="keyTypeface">normal</item>
-        <item name="verticalCorrection">@dimen/more_keys_keyboard_vertical_correction_gb</item>
-    </style>
-    <style
-        name="MoreKeysKeyboardContainer.GB"
-    >
-        <item name="android:background">@drawable/keyboard_popup_panel_background_gb</item>
+        <item name="verticalCorrection">@dimen/config_more_keys_keyboard_vertical_correction_gb</item>
     </style>
     <style
         name="SuggestionStripView.GB"
diff --git a/java/res/values/themes-ics.xml b/java/res/values/themes-ics.xml
index 432ad51..125b640 100644
--- a/java/res/values/themes-ics.xml
+++ b/java/res/values/themes-ics.xml
@@ -23,10 +23,10 @@
         <item name="keyboardStyle">@style/Keyboard.ICS</item>
         <item name="keyboardViewStyle">@style/KeyboardView.ICS</item>
         <item name="mainKeyboardViewStyle">@style/MainKeyboardView.ICS</item>
+        <item name="keyPreviewTextViewStyle">@style/KeyPreviewTextView.ICS</item>
         <item name="emojiPalettesViewStyle">@style/EmojiPalettesView.ICS</item>
         <item name="moreKeysKeyboardStyle">@style/MoreKeysKeyboard.ICS</item>
         <item name="moreKeysKeyboardViewStyle">@style/MoreKeysKeyboardView.ICS</item>
-        <item name="moreKeysKeyboardContainerStyle">@style/MoreKeysKeyboardContainer.ICS</item>
         <item name="suggestionStripViewStyle">@style/SuggestionStripView.ICS</item>
         <item name="suggestionWordStyle">@style/SuggestionWord.ICS</item>
     </style>
@@ -36,10 +36,10 @@
     >
         <!-- This should be aligned with KeyboardSwitcher.KEYBOARD_THEMES[] -->
         <item name="themeId">2</item>
-        <item name="keyboardTopPadding">@fraction/keyboard_top_padding_holo</item>
-        <item name="keyboardBottomPadding">@fraction/keyboard_bottom_padding_holo</item>
-        <item name="horizontalGap">@fraction/key_horizontal_gap_holo</item>
-        <item name="verticalGap">@fraction/key_bottom_gap_holo</item>
+        <item name="keyboardTopPadding">@fraction/config_keyboard_top_padding_holo</item>
+        <item name="keyboardBottomPadding">@fraction/config_keyboard_bottom_padding_holo</item>
+        <item name="horizontalGap">@fraction/config_key_horizontal_gap_holo</item>
+        <item name="verticalGap">@fraction/config_key_vertical_gap_holo</item>
         <item name="touchPositionCorrectionData">@array/touch_position_correction_data_holo</item>
     </style>
     <style
@@ -63,16 +63,22 @@
         name="MainKeyboardView.ICS"
         parent="KeyboardView.ICS"
     >
-        <item name="keyPreviewLayout">@layout/key_preview_ics</item>
-        <item name="keyPreviewOffset">@dimen/key_preview_offset_holo</item>
+        <item name="keyPreviewOffset">@dimen/config_key_preview_offset_holo</item>
         <item name="gestureFloatingPreviewTextColor">@color/highlight_color_ics</item>
         <item name="gestureFloatingPreviewColor">@color/gesture_floating_preview_color_holo</item>
         <item name="gestureTrailColor">@color/highlight_color_ics</item>
         <item name="slidingKeyInputPreviewColor">@color/highlight_translucent_color_ics</item>
         <item name="autoCorrectionSpacebarLedEnabled">false</item>
         <item name="autoCorrectionSpacebarLedIcon">@drawable/sym_keyboard_space_led_holo</item>
-        <item name="spacebarTextColor">@color/spacebar_text_color_holo</item>
-        <item name="spacebarTextShadowColor">@color/spacebar_text_shadow_color_holo</item>
+        <item name="languageOnSpacebarTextColor">@color/spacebar_text_color_holo</item>
+        <item name="languageOnSpacebarTextShadowColor">@color/spacebar_text_shadow_color_holo</item>
+        <item name="spacebarBackground">@drawable/btn_keyboard_spacebar_ics</item>
+    </style>
+    <style
+        name="KeyPreviewTextView.ICS"
+        parent="KeyPreviewTextView"
+    >
+        <item name="android:background">@drawable/keyboard_key_feedback_ics</item>
     </style>
     <!-- Though {@link EmojiPalettesView} doesn't extend {@link KeyboardView}, some views inside it,
          for instance delete button, need themed {@link KeyboardView} attributes. -->
@@ -96,15 +102,10 @@
         name="MoreKeysKeyboardView.ICS"
         parent="KeyboardView.ICS"
     >
-        <item name="android:background">@null</item>
+        <item name="android:background">@drawable/keyboard_popup_panel_background_ics</item>
         <item name="keyBackground">@drawable/btn_keyboard_key_popup_ics</item>
         <item name="keyTypeface">normal</item>
-        <item name="verticalCorrection">@dimen/more_keys_keyboard_vertical_correction_holo</item>
-    </style>
-    <style
-        name="MoreKeysKeyboardContainer.ICS"
-    >
-        <item name="android:background">@drawable/keyboard_popup_panel_background_ics</item>
+        <item name="verticalCorrection">@dimen/config_more_keys_keyboard_vertical_correction_holo</item>
     </style>
     <style
         name="SuggestionStripView.ICS"
diff --git a/java/res/values/themes-klp.xml b/java/res/values/themes-klp.xml
index a373001..f6c0767 100644
--- a/java/res/values/themes-klp.xml
+++ b/java/res/values/themes-klp.xml
@@ -23,10 +23,10 @@
         <item name="keyboardStyle">@style/Keyboard.KLP</item>
         <item name="keyboardViewStyle">@style/KeyboardView.KLP</item>
         <item name="mainKeyboardViewStyle">@style/MainKeyboardView.KLP</item>
+        <item name="keyPreviewTextViewStyle">@style/KeyPreviewTextView.KLP</item>
         <item name="emojiPalettesViewStyle">@style/EmojiPalettesView.KLP</item>
         <item name="moreKeysKeyboardStyle">@style/MoreKeysKeyboard.KLP</item>
         <item name="moreKeysKeyboardViewStyle">@style/MoreKeysKeyboardView.KLP</item>
-        <item name="moreKeysKeyboardContainerStyle">@style/MoreKeysKeyboardContainer.KLP</item>
         <item name="suggestionStripViewStyle">@style/SuggestionStripView.KLP</item>
         <item name="suggestionWordStyle">@style/SuggestionWord.KLP</item>
     </style>
@@ -36,10 +36,10 @@
     >
         <!-- This should be aligned with KeyboardSwitcher.KEYBOARD_THEMES[] -->
         <item name="themeId">0</item>
-        <item name="keyboardTopPadding">@fraction/keyboard_top_padding_holo</item>
-        <item name="keyboardBottomPadding">@fraction/keyboard_bottom_padding_holo</item>
-        <item name="horizontalGap">@fraction/key_horizontal_gap_holo</item>
-        <item name="verticalGap">@fraction/key_bottom_gap_holo</item>
+        <item name="keyboardTopPadding">@fraction/config_keyboard_top_padding_holo</item>
+        <item name="keyboardBottomPadding">@fraction/config_keyboard_bottom_padding_holo</item>
+        <item name="horizontalGap">@fraction/config_key_horizontal_gap_holo</item>
+        <item name="verticalGap">@fraction/config_key_vertical_gap_holo</item>
         <item name="touchPositionCorrectionData">@array/touch_position_correction_data_holo</item>
     </style>
     <style
@@ -63,16 +63,22 @@
         name="MainKeyboardView.KLP"
         parent="KeyboardView.KLP"
     >
-        <item name="keyPreviewLayout">@layout/key_preview_klp</item>
-        <item name="keyPreviewOffset">@dimen/key_preview_offset_holo</item>
+        <item name="keyPreviewOffset">@dimen/config_key_preview_offset_holo</item>
         <item name="gestureFloatingPreviewTextColor">@color/highlight_color_klp</item>
         <item name="gestureFloatingPreviewColor">@color/gesture_floating_preview_color_holo</item>
         <item name="gestureTrailColor">@color/highlight_color_klp</item>
         <item name="slidingKeyInputPreviewColor">@color/highlight_translucent_color_klp</item>
         <item name="autoCorrectionSpacebarLedEnabled">false</item>
         <item name="autoCorrectionSpacebarLedIcon">@drawable/sym_keyboard_space_led_holo</item>
-        <item name="spacebarTextColor">@color/spacebar_text_color_holo</item>
-        <item name="spacebarTextShadowColor">@color/spacebar_text_shadow_color_holo</item>
+        <item name="languageOnSpacebarTextColor">@color/spacebar_text_color_holo</item>
+        <item name="languageOnSpacebarTextShadowColor">@color/spacebar_text_shadow_color_holo</item>
+        <item name="spacebarBackground">@drawable/btn_keyboard_spacebar_klp</item>
+    </style>
+    <style
+        name="KeyPreviewTextView.KLP"
+        parent="KeyPreviewTextView"
+    >
+        <item name="android:background">@drawable/keyboard_key_feedback_klp</item>
     </style>
     <!-- Though {@link EmojiPalettesView} doesn't extend {@link KeyboardView}, some views inside it,
          for instance delete button, need themed {@link KeyboardView} attributes. -->
@@ -96,15 +102,10 @@
         name="MoreKeysKeyboardView.KLP"
         parent="KeyboardView.KLP"
     >
-        <item name="android:background">@null</item>
+        <item name="android:background">@drawable/keyboard_popup_panel_background_klp</item>
         <item name="keyBackground">@drawable/btn_keyboard_key_popup_klp</item>
         <item name="keyTypeface">normal</item>
-        <item name="verticalCorrection">@dimen/more_keys_keyboard_vertical_correction_holo</item>
-    </style>
-    <style
-        name="MoreKeysKeyboardContainer.KLP"
-    >
-        <item name="android:background">@drawable/keyboard_popup_panel_background_klp</item>
+        <item name="verticalCorrection">@dimen/config_more_keys_keyboard_vertical_correction_holo</item>
     </style>
     <style
         name="SuggestionStripView.KLP"
diff --git a/java/res/xml-sw600dp-land/kbd_more_keys_keyboard_template.xml b/java/res/xml-sw600dp-land/kbd_more_keys_keyboard_template.xml
index 4d8b446..c7d4460 100644
--- a/java/res/xml-sw600dp-land/kbd_more_keys_keyboard_template.xml
+++ b/java/res/xml-sw600dp-land/kbd_more_keys_keyboard_template.xml
@@ -20,7 +20,7 @@
 
 <Keyboard xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyWidth="5%p"
-    latin:rowHeight="@dimen/popup_key_height"
+    latin:rowHeight="@dimen/config_more_keys_keyboard_key_height"
     style="?attr/moreKeysKeyboardStyle"
     >
 </Keyboard>
diff --git a/java/res/xml-sw600dp/kbd_more_keys_keyboard_template.xml b/java/res/xml-sw600dp/kbd_more_keys_keyboard_template.xml
index d90a588..fbe8cfc 100644
--- a/java/res/xml-sw600dp/kbd_more_keys_keyboard_template.xml
+++ b/java/res/xml-sw600dp/kbd_more_keys_keyboard_template.xml
@@ -20,7 +20,7 @@
 
 <Keyboard xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyWidth="8%p"
-    latin:rowHeight="@dimen/popup_key_height"
+    latin:rowHeight="@dimen/config_more_keys_keyboard_key_height"
     style="?attr/moreKeysKeyboardStyle"
     >
 </Keyboard>
diff --git a/java/res/xml-sw600dp/key_f1.xml b/java/res/xml-sw600dp/key_f1.xml
index ac00532..530f7d6 100644
--- a/java/res/xml-sw600dp/key_f1.xml
+++ b/java/res/xml-sw600dp/key_f1.xml
@@ -23,34 +23,11 @@
 >
     <switch>
         <case
-            latin:keyboardLayoutSetElement="symbols"
-            latin:mode="url"
-        >
-            <Key
-                latin:keyLabel=":" />
-        </case>
-        <case
-            latin:keyboardLayoutSetElement="symbols"
-        >
-            <Key
-                latin:keyLabel="\@" />
-        </case>
-        <!-- keyboardLayoutSetElement != "symbols" -->
-        <case
             latin:mode="email"
         >
             <Key
                 latin:keyLabel="\@" />
         </case>
-        <case
-            latin:mode="url"
-        >
-            <Key
-                latin:keyLabel="/"
-                latin:keyHintLabel=":"
-                latin:moreKeys=":"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-        </case>
         <default>
             <Key
                 latin:keyLabel="/" />
diff --git a/java/res/xml-sw600dp/key_shortcut.xml b/java/res/xml-sw600dp/key_shortcut.xml
index 87fc75c..c869e74 100644
--- a/java/res/xml-sw600dp/key_shortcut.xml
+++ b/java/res/xml-sw600dp/key_shortcut.xml
@@ -23,7 +23,7 @@
 >
     <switch>
         <case
-            latin:shortcutKeyEnabled="true"
+            latin:supportsSwitchingToShortcutIme="true"
             latin:clobberSettingsKey="false"
         >
             <Key
@@ -32,20 +32,20 @@
                 latin:moreKeys="!text/settings_as_more_key" />
         </case>
         <case
-            latin:shortcutKeyEnabled="true"
+            latin:supportsSwitchingToShortcutIme="true"
             latin:clobberSettingsKey="true"
         >
             <Key
                 latin:keyStyle="shortcutKeyStyle" />
         </case>
         <case
-            latin:shortcutKeyEnabled="false"
+            latin:supportsSwitchingToShortcutIme="false"
             latin:clobberSettingsKey="false"
         >
             <Key
                 latin:keyStyle="settingsKeyStyle" />
         </case>
-        <!-- shortcutKeyEnabled="false" clobberSettingsKey="true" -->
+        <!-- supportsSwitchingToShortcutIme="false" clobberSettingsKey="true" -->
         <default>
             <Spacer />
         </default>
diff --git a/java/res/xml-sw600dp/key_space_symbols.xml b/java/res/xml-sw600dp/key_space_symbols.xml
index 07aa7d1..d6f7cab 100644
--- a/java/res/xml-sw600dp/key_space_symbols.xml
+++ b/java/res/xml-sw600dp/key_space_symbols.xml
@@ -22,5 +22,6 @@
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
     <include
+        latin:backgroundType="normal"
         latin:keyboardLayout="@xml/key_space_5kw" />
 </merge>
diff --git a/java/res/xml-sw600dp/keys_comma_period.xml b/java/res/xml-sw600dp/keys_comma_period.xml
index 7604e03..55302ae 100644
--- a/java/res/xml-sw600dp/keys_comma_period.xml
+++ b/java/res/xml-sw600dp/keys_comma_period.xml
@@ -21,83 +21,18 @@
 <merge
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
-    <switch>
-        <case
-            latin:mode="email|url"
-        >
-            <Key
-                latin:keyLabel=","
-                latin:keyHintLabel="-"
-                latin:moreKeys="-"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-            <Key
-                latin:keyLabel="."
-                latin:keyHintLabel="_"
-                latin:moreKeys="_"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-        </case>
-        <case
-            latin:languageCode="ar"
-        >
-            <Key
-                latin:keyLabel="!text/keylabel_for_apostrophe"
-                latin:keyHintLabel="!text/keyhintlabel_for_apostrophe"
-                latin:moreKeys="!text/more_keys_for_apostrophe"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-            <Key
-                latin:keyLabel="."
-                latin:keyHintLabel="!text/keyhintlabel_for_arabic_diacritics"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="!text/more_keys_for_arabic_diacritics"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-        </case>
-        <case
-            latin:languageCode="fa"
-        >
-            <Key
-                latin:keyLabel="!text/keylabel_for_apostrophe"
-                latin:keyHintLabel="!text/keyhintlabel_for_apostrophe"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="!text/more_keys_for_apostrophe"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-            <Key
-                latin:keyLabel="."
-                latin:keyHintLabel="!text/keyhintlabel_for_arabic_diacritics"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="!text/more_keys_for_arabic_diacritics"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-        </case>
-        <case
-            latin:languageCode="hy"
-        >
-            <!-- U+055D: "՝" ARMENIAN COMMA -->
-            <Key
-                latin:keyLabel="&#x055D;"
-                latin:backgroundType="functional" />
-            <!-- U+0589: "։" ARMENIAN FULL STOP -->
-            <Key
-                latin:keyLabel="&#x0589;"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:backgroundType="functional"
-                latin:moreKeys="!text/more_keys_for_punctuation" />
-        </case>
-        <default>
-            <Key
-                latin:keyLabel="!text/keylabel_for_tablet_comma"
-                latin:keyHintLabel="!text/keyhintlabel_for_tablet_comma"
-                latin:backgroundType="functional"
-                latin:moreKeys="!text/more_keys_for_tablet_comma" />
-            <Key
-                latin:keyLabel="."
-                latin:keyHintLabel="!text/keyhintlabel_for_period"
-                latin:backgroundType="functional"
-                latin:moreKeys="!text/more_keys_for_period" />
-        </default>
-    </switch>
+    <Key
+        latin:keyLabel="!text/keylabel_for_tablet_comma"
+        latin:keyHintLabel="!text/keyhintlabel_for_tablet_comma"
+        latin:keyLabelFlags="hasPopupHint"
+        latin:moreKeys="!text/more_keys_for_tablet_comma"
+        latin:backgroundType="functional"
+        latin:keyStyle="hasShiftedLetterHintStyle" />
+    <Key
+        latin:keyLabel="!text/keylabel_for_tablet_period"
+        latin:keyHintLabel="!text/keyhintlabel_for_tablet_period"
+        latin:keyLabelFlags="hasPopupHint"
+        latin:moreKeys="!text/more_keys_for_tablet_period"
+        latin:backgroundType="functional"
+        latin:keyStyle="hasShiftedLetterHintStyle" />
 </merge>
diff --git a/java/res/xml-sw600dp/keys_exclamation_question.xml b/java/res/xml-sw600dp/keys_exclamation_question.xml
index cd38282..fd84922 100644
--- a/java/res/xml-sw600dp/keys_exclamation_question.xml
+++ b/java/res/xml-sw600dp/keys_exclamation_question.xml
@@ -22,7 +22,9 @@
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
     <Key
-        latin:keyLabel="!" />
+        latin:keyLabel="!"
+        latin:moreKeys="!text/more_keys_for_exclamation" />
     <Key
-        latin:keyLabel="\?" />
+        latin:keyLabel="\?"
+        latin:moreKeys="!text/more_keys_for_question" />
 </merge>
diff --git a/java/res/xml-sw600dp/keys_pcqwerty4_right3.xml b/java/res/xml-sw600dp/keys_pcqwerty4_right3.xml
index 774ff8d..46a1c85 100644
--- a/java/res/xml-sw600dp/keys_pcqwerty4_right3.xml
+++ b/java/res/xml-sw600dp/keys_pcqwerty4_right3.xml
@@ -40,7 +40,7 @@
                 latin:keyHintLabel="\?"
                 latin:additionalMoreKeys="\?"
                 latin:keyStyle="hasShiftedLetterHintStyle"
-                latin:moreKeys="!text/more_keys_for_symbols_question" />
+                latin:moreKeys="!text/more_keys_for_question" />
         </case>
         <!-- keyboardLayoutSetElement="alphabetManualShifted|alphabetShiftLocked|alphabetShiftLockShifted" -->
         <default>
@@ -58,7 +58,7 @@
                 latin:moreKeys="!fixedColumnOrder!3,&#x203A;,&#x2265;,&#x00BB;" />
             <Key
                 latin:keyLabel="\?"
-                latin:moreKeys="!text/more_keys_for_symbols_question" />
+                latin:moreKeys="!text/more_keys_for_question" />
         </default>
     </switch>
 </merge>
diff --git a/java/res/xml-sw600dp/rowkeys_pcqwerty1.xml b/java/res/xml-sw600dp/rowkeys_pcqwerty1.xml
index 254d3fd..ae6bab7 100644
--- a/java/res/xml-sw600dp/rowkeys_pcqwerty1.xml
+++ b/java/res/xml-sw600dp/rowkeys_pcqwerty1.xml
@@ -31,7 +31,7 @@
         latin:keyHintLabel="!"
         latin:additionalMoreKeys="!"
         latin:keyStyle="hasShiftedLetterHintStyle"
-        latin:moreKeys="!text/more_keys_for_symbols_exclamation,!text/more_keys_for_symbols_1" />
+        latin:moreKeys="!text/more_keys_for_exclamation,!text/more_keys_for_symbols_1" />
     <Key
         latin:keyLabel="2"
         latin:keyHintLabel="\@"
diff --git a/java/res/xml-sw600dp/rows_hebrew.xml b/java/res/xml-sw600dp/rows_hebrew.xml
index 852e176..86b3420 100644
--- a/java/res/xml-sw600dp/rows_hebrew.xml
+++ b/java/res/xml-sw600dp/rows_hebrew.xml
@@ -45,8 +45,10 @@
         latin:keyWidth="9.0%p"
     >
         <include
-            latin:keyboardLayout="@xml/rowkeys_hebrew3"
-            latin:keyXPos="10.0%p" />
+            latin:keyboardLayout="@xml/rowkeys_hebrew3" />
+        <include
+            latin:keyboardLayout="@xml/keys_exclamation_question"
+            latin:keyWidth="9.5%p" />
     </Row>
     <include
         latin:keyboardLayout="@xml/row_qwerty4" />
diff --git a/java/res/xml-sw600dp/rows_swiss.xml b/java/res/xml-sw600dp/rows_swiss.xml
new file mode 100644
index 0000000..4f4ca85
--- /dev/null
+++ b/java/res/xml-sw600dp/rows_swiss.xml
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<merge
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
+>
+    <include
+        latin:keyboardLayout="@xml/key_styles_common" />
+    <Row
+        latin:keyWidth="8.182%p"
+    >
+        <include
+            latin:keyboardLayout="@xml/rowkeys_swiss1" />
+        <Key
+            latin:keyStyle="deleteKeyStyle"
+            latin:keyWidth="fillRight" />
+    </Row>
+    <Row
+        latin:keyWidth="8.182%p"
+    >
+        <include
+            latin:keyboardLayout="@xml/rowkeys_swiss2" />
+        <Key
+            latin:keyStyle="enterKeyStyle"
+            latin:keyWidth="fillRight" />
+    </Row>
+    <Row
+        latin:keyWidth="8.182%p"
+    >
+        <Key
+            latin:keyStyle="shiftKeyStyle"
+            latin:keyWidth="10.0%p" />
+        <Spacer
+            latin:keyWidth="3.181%p" />
+        <include
+            latin:keyboardLayout="@xml/rowkeys_qwertz3" />
+        <include
+            latin:keyboardLayout="@xml/keys_exclamation_question" />
+        <Key
+            latin:keyStyle="shiftKeyStyle"
+            latin:keyXPos="-10.0%p"
+            latin:keyWidth="fillRight" />
+    </Row>
+    <include
+        latin:keyboardLayout="@xml/row_qwerty4" />
+</merge>
diff --git a/java/res/xml-sw600dp/rows_symbols.xml b/java/res/xml-sw600dp/rows_symbols.xml
index cf94b06..7a33f49 100644
--- a/java/res/xml-sw600dp/rows_symbols.xml
+++ b/java/res/xml-sw600dp/rows_symbols.xml
@@ -62,6 +62,7 @@
     </Row>
     <Row
         latin:keyWidth="9.0%p"
+        latin:backgroundType="functional"
     >
         <Key
             latin:keyStyle="toAlphaKeyStyle"
diff --git a/java/res/xml-sw600dp/rows_symbols_shift.xml b/java/res/xml-sw600dp/rows_symbols_shift.xml
index 92299f6..79d1aa1 100644
--- a/java/res/xml-sw600dp/rows_symbols_shift.xml
+++ b/java/res/xml-sw600dp/rows_symbols_shift.xml
@@ -64,6 +64,7 @@
     </Row>
     <Row
         latin:keyWidth="9.0%p"
+        latin:backgroundType="functional"
     >
         <Key
             latin:keyStyle="toAlphaKeyStyle"
diff --git a/java/res/xml/kbd_armenian_phonetic.xml b/java/res/xml/kbd_armenian_phonetic.xml
index 1eb3c7e..da12870 100644
--- a/java/res/xml/kbd_armenian_phonetic.xml
+++ b/java/res/xml/kbd_armenian_phonetic.xml
@@ -21,9 +21,9 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:rowHeight="20%p"
-    latin:verticalGap="@fraction/key_bottom_gap_5row"
-    latin:keyLetterSize="@fraction/key_letter_ratio_5row"
-    latin:keyShiftedLetterHintRatio="@fraction/key_uppercase_letter_ratio_5row"
+    latin:verticalGap="@fraction/config_key_vertical_gap_5row"
+    latin:keyLetterSize="@fraction/config_key_letter_ratio_5row"
+    latin:keyShiftedLetterHintRatio="@fraction/config_key_shifted_letter_hint_ratio_5row"
     latin:touchPositionCorrectionData="@array/touch_position_correction_data_default"
 >
     <include
diff --git a/java/res/xml/kbd_emoji_category1.xml b/java/res/xml/kbd_emoji_category1.xml
index c11a830..5145ea9 100644
--- a/java/res/xml/kbd_emoji_category1.xml
+++ b/java/res/xml/kbd_emoji_category1.xml
@@ -20,9 +20,9 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyWidth="@fraction/emoji_keyboard_key_width"
+    latin:keyWidth="@fraction/config_emoji_keyboard_key_width"
     latin:keyLetterSize="90%p"
-    latin:rowHeight="@fraction/emoji_keyboard_row_height"
+    latin:rowHeight="@fraction/config_emoji_keyboard_row_height"
 >
     <GridRows
         latin:codesArray="@array/emoji_faces"
diff --git a/java/res/xml/kbd_emoji_category2.xml b/java/res/xml/kbd_emoji_category2.xml
index d3e5890..ac8784f 100644
--- a/java/res/xml/kbd_emoji_category2.xml
+++ b/java/res/xml/kbd_emoji_category2.xml
@@ -20,9 +20,9 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyWidth="@fraction/emoji_keyboard_key_width"
+    latin:keyWidth="@fraction/config_emoji_keyboard_key_width"
     latin:keyLetterSize="90%p"
-    latin:rowHeight="@fraction/emoji_keyboard_row_height"
+    latin:rowHeight="@fraction/config_emoji_keyboard_row_height"
 >
     <GridRows
         latin:codesArray="@array/emoji_objects"
diff --git a/java/res/xml/kbd_emoji_category3.xml b/java/res/xml/kbd_emoji_category3.xml
index 0efafa8..88c4db9 100644
--- a/java/res/xml/kbd_emoji_category3.xml
+++ b/java/res/xml/kbd_emoji_category3.xml
@@ -20,9 +20,9 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyWidth="@fraction/emoji_keyboard_key_width"
+    latin:keyWidth="@fraction/config_emoji_keyboard_key_width"
     latin:keyLetterSize="90%p"
-    latin:rowHeight="@fraction/emoji_keyboard_row_height"
+    latin:rowHeight="@fraction/config_emoji_keyboard_row_height"
 >
     <GridRows
         latin:codesArray="@array/emoji_nature"
diff --git a/java/res/xml/kbd_emoji_category4.xml b/java/res/xml/kbd_emoji_category4.xml
index e529120..262384d 100644
--- a/java/res/xml/kbd_emoji_category4.xml
+++ b/java/res/xml/kbd_emoji_category4.xml
@@ -20,9 +20,9 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyWidth="@fraction/emoji_keyboard_key_width"
+    latin:keyWidth="@fraction/config_emoji_keyboard_key_width"
     latin:keyLetterSize="90%p"
-    latin:rowHeight="@fraction/emoji_keyboard_row_height"
+    latin:rowHeight="@fraction/config_emoji_keyboard_row_height"
 >
     <GridRows
         latin:codesArray="@array/emoji_places"
diff --git a/java/res/xml/kbd_emoji_category5.xml b/java/res/xml/kbd_emoji_category5.xml
index 1836879..bf823f9 100644
--- a/java/res/xml/kbd_emoji_category5.xml
+++ b/java/res/xml/kbd_emoji_category5.xml
@@ -20,9 +20,9 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyWidth="@fraction/emoji_keyboard_key_width"
+    latin:keyWidth="@fraction/config_emoji_keyboard_key_width"
     latin:keyLetterSize="90%p"
-    latin:rowHeight="@fraction/emoji_keyboard_row_height"
+    latin:rowHeight="@fraction/config_emoji_keyboard_row_height"
 >
     <GridRows
         latin:codesArray="@array/emoji_symbols"
diff --git a/java/res/xml/kbd_emoji_category6.xml b/java/res/xml/kbd_emoji_category6.xml
index b47ebfe..edb82fc 100644
--- a/java/res/xml/kbd_emoji_category6.xml
+++ b/java/res/xml/kbd_emoji_category6.xml
@@ -20,10 +20,10 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyWidth="@fraction/emoji_keyboard_key_width"
+    latin:keyWidth="@fraction/config_emoji_keyboard_key_width"
     latin:keyLetterSize="90%p"
     latin:keyLabelSize="60%p"
-    latin:rowHeight="@fraction/emoji_keyboard_row_height"
+    latin:rowHeight="@fraction/config_emoji_keyboard_row_height"
 >
     <GridRows
         latin:textsArray="@array/emoji_emoticons"
diff --git a/java/res/xml/kbd_emoji_recents.xml b/java/res/xml/kbd_emoji_recents.xml
index 73926ec..edf3872 100644
--- a/java/res/xml/kbd_emoji_recents.xml
+++ b/java/res/xml/kbd_emoji_recents.xml
@@ -20,10 +20,10 @@
 
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
-    latin:keyWidth="@fraction/emoji_keyboard_key_width"
-    latin:keyLetterSize="@fraction/emoji_keyboard_key_letter_size"
+    latin:keyWidth="@fraction/config_emoji_keyboard_key_width"
+    latin:keyLetterSize="@fraction/config_emoji_keyboard_key_letter_size"
     latin:keyLabelSize="60%p"
-    latin:rowHeight="@fraction/emoji_keyboard_row_height"
+    latin:rowHeight="@fraction/config_emoji_keyboard_row_height"
 >
     <GridRows
         latin:codesArray="@array/emoji_recents"
diff --git a/java/res/xml/kbd_khmer.xml b/java/res/xml/kbd_khmer.xml
index 7a2337a..d703e78 100644
--- a/java/res/xml/kbd_khmer.xml
+++ b/java/res/xml/kbd_khmer.xml
@@ -21,9 +21,9 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:rowHeight="20%p"
-    latin:verticalGap="@fraction/key_bottom_gap_5row"
-    latin:keyLetterSize="@fraction/key_letter_ratio_5row"
-    latin:keyShiftedLetterHintRatio="@fraction/key_uppercase_letter_ratio_5row"
+    latin:verticalGap="@fraction/config_key_vertical_gap_5row"
+    latin:keyLetterSize="@fraction/config_key_letter_ratio_5row"
+    latin:keyShiftedLetterHintRatio="@fraction/config_key_shifted_letter_hint_ratio_5row"
     latin:touchPositionCorrectionData="@array/touch_position_correction_data_default"
 >
     <include
diff --git a/java/res/xml/kbd_lao.xml b/java/res/xml/kbd_lao.xml
index 2bba330..6f77095 100644
--- a/java/res/xml/kbd_lao.xml
+++ b/java/res/xml/kbd_lao.xml
@@ -21,9 +21,9 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:rowHeight="20%p"
-    latin:verticalGap="@fraction/key_bottom_gap_5row"
-    latin:keyLetterSize="@fraction/key_letter_ratio_5row"
-    latin:keyShiftedLetterHintRatio="@fraction/key_uppercase_letter_ratio_5row"
+    latin:verticalGap="@fraction/config_key_vertical_gap_5row"
+    latin:keyLetterSize="@fraction/config_key_letter_ratio_5row"
+    latin:keyShiftedLetterHintRatio="@fraction/config_key_shifted_letter_hint_ratio_5row"
     latin:touchPositionCorrectionData="@array/touch_position_correction_data_default"
 >
     <include
diff --git a/java/res/xml/kbd_more_keys_keyboard_template.xml b/java/res/xml/kbd_more_keys_keyboard_template.xml
index 537973d..7104ec7 100644
--- a/java/res/xml/kbd_more_keys_keyboard_template.xml
+++ b/java/res/xml/kbd_more_keys_keyboard_template.xml
@@ -20,7 +20,7 @@
 
 <Keyboard xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyWidth="10%p"
-    latin:rowHeight="@dimen/popup_key_height"
+    latin:rowHeight="@dimen/config_more_keys_keyboard_key_height"
     style="?attr/moreKeysKeyboardStyle"
     >
 </Keyboard>
diff --git a/java/res/xml/kbd_pcqwerty.xml b/java/res/xml/kbd_pcqwerty.xml
index 5155bc5..0456964 100644
--- a/java/res/xml/kbd_pcqwerty.xml
+++ b/java/res/xml/kbd_pcqwerty.xml
@@ -21,9 +21,9 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:rowHeight="20%p"
-    latin:verticalGap="@fraction/key_bottom_gap_5row"
-    latin:keyLetterSize="@fraction/key_letter_ratio_5row"
-    latin:keyShiftedLetterHintRatio="@fraction/key_uppercase_letter_ratio_5row"
+    latin:verticalGap="@fraction/config_key_vertical_gap_5row"
+    latin:keyLetterSize="@fraction/config_key_letter_ratio_5row"
+    latin:keyShiftedLetterHintRatio="@fraction/config_key_shifted_letter_hint_ratio_5row"
     latin:touchPositionCorrectionData="@array/touch_position_correction_data_default"
 >
     <include
diff --git a/java/res/xml/kbd_suggestions_pane_template.xml b/java/res/xml/kbd_suggestions_pane_template.xml
index 21316e6..5b4f606 100644
--- a/java/res/xml/kbd_suggestions_pane_template.xml
+++ b/java/res/xml/kbd_suggestions_pane_template.xml
@@ -20,6 +20,6 @@
 
 <Keyboard xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:keyWidth="10%p"
-    latin:rowHeight="@dimen/more_suggestions_row_height"
+    latin:rowHeight="@dimen/config_more_suggestions_row_height"
     >
 </Keyboard>
diff --git a/java/res/values-sw540dp-land/config.xml b/java/res/xml/kbd_swiss.xml
similarity index 73%
copy from java/res/values-sw540dp-land/config.xml
copy to java/res/xml/kbd_swiss.xml
index b3cd727..c64ad11 100644
--- a/java/res/values-sw540dp-land/config.xml
+++ b/java/res/xml/kbd_swiss.xml
@@ -2,7 +2,7 @@
 <!--
 /*
 **
-** Copyright 2011, The Android Open Source Project
+** Copyright 2013, The Android Open Source Project
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
@@ -18,6 +18,9 @@
 */
 -->
 
-<resources>
-    <bool name="config_use_fullscreen_mode">false</bool>
-</resources>
+<Keyboard
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
+>
+    <include
+        latin:keyboardLayout="@xml/rows_swiss" />
+</Keyboard>
diff --git a/java/res/xml/kbd_thai.xml b/java/res/xml/kbd_thai.xml
index 294bffb..7e65217 100644
--- a/java/res/xml/kbd_thai.xml
+++ b/java/res/xml/kbd_thai.xml
@@ -21,9 +21,9 @@
 <Keyboard
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     latin:rowHeight="20%p"
-    latin:verticalGap="@fraction/key_bottom_gap_5row"
-    latin:keyLetterSize="@fraction/key_letter_ratio_5row"
-    latin:keyShiftedLetterHintRatio="@fraction/key_uppercase_letter_ratio_5row"
+    latin:verticalGap="@fraction/config_key_vertical_gap_5row"
+    latin:keyLetterSize="@fraction/config_key_letter_ratio_5row"
+    latin:keyShiftedLetterHintRatio="@fraction/config_key_shifted_letter_hint_ratio_5row"
     latin:touchPositionCorrectionData="@array/touch_position_correction_data_default"
 >
     <include
diff --git a/java/res/xml/key_f1.xml b/java/res/xml/key_f1.xml
index 72e38cb..0e9d497 100644
--- a/java/res/xml/key_f1.xml
+++ b/java/res/xml/key_f1.xml
@@ -37,6 +37,16 @@
                 latin:keyStyle="f1MoreKeysStyle" />
         </case>
         <case
+            latin:supportsSwitchingToShortcutIme="false"
+        >
+            <Key
+                latin:keyLabel="!text/keylabel_for_comma"
+                latin:keyLabelFlags="hasPopupHint"
+                latin:additionalMoreKeys="!text/more_keys_for_comma"
+                latin:keyStyle="f1MoreKeysStyle" />
+        </case>
+        <!-- latin:supportsSwitchingToShortcutIme="true" -->
+        <case
             latin:hasShortcutKey="true"
         >
             <Key
diff --git a/java/res/xml/key_nepali_traditional_period.xml b/java/res/xml/key_period.xml
similarity index 69%
rename from java/res/xml/key_nepali_traditional_period.xml
rename to java/res/xml/key_period.xml
index 1c389b0..838db25 100644
--- a/java/res/xml/key_nepali_traditional_period.xml
+++ b/java/res/xml/key_period.xml
@@ -18,32 +18,31 @@
 */
 -->
 
-<!-- The code point U+25CC for key label is needed because the font rendering system prior to
-     API version 16 can't automatically render dotted circle for incomplete combining letter
-     of Hindi. The files named res/xml/{key,keys}_nepali*.xml have this U+25CC hack, although the
-     counterpart files named res/xml-v16/{key,keys}_nepali*.xml don't have this hack. -->
 <merge
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
     <switch>
         <case
-            latin:keyboardLayoutSetElement="alphabetManualShifted|alphabetShiftLocked|alphabetShiftLockShifted"
+            latin:languageCode="ne"
+            latin:keyboardLayoutSet="nepali_traditional"
         >
-            <Key
-                latin:keyLabel=","
-                latin:backgroundType="functional" />
-        </case>
-        <default>
             <!-- Because the font rendering system prior to API version 16 can't automatically
                  render dotted circle for incomplete combining letter of some scripts, different
                  set of Key definitions are needed based on the API version. -->
             <include
                 latin:keyboardLayout="@xml/keystyle_devanagari_sign_virama" />
-            <!-- U+002E: "." FULL STOP -->
             <Key
                 latin:keyStyle="baseKeyDevanagariSignVirama"
                 latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="!fixedColumnOrder!9,&#x002E;,!text/more_keys_for_punctuation"
+                latin:moreKeys="!text/more_keys_for_punctuation"
+                latin:backgroundType="functional" />
+        </case>
+        <default>
+            <Key
+                latin:keyLabel="!text/keylabel_for_period"
+                latin:keyHintLabel="!text/keyhintlabel_for_period"
+                latin:keyLabelFlags="hasPopupHint|hasShiftedLetterHint"
+                latin:moreKeys="!text/more_keys_for_period"
                 latin:backgroundType="functional" />
         </default>
     </switch>
diff --git a/java/res/xml/key_space_symbols.xml b/java/res/xml/key_space_symbols.xml
index 1efc4ff..0ce5228 100644
--- a/java/res/xml/key_space_symbols.xml
+++ b/java/res/xml/key_space_symbols.xml
@@ -21,6 +21,8 @@
 <merge
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
-    <include
-        latin:keyboardLayout="@xml/key_space_3kw" />
+    <Key
+        latin:backgroundType="normal"
+        latin:keyStyle="spaceKeyStyle"
+        latin:keyWidth="30%p" />
 </merge>
diff --git a/java/res/xml/key_styles_common.xml b/java/res/xml/key_styles_common.xml
index c9d87bf..d538eb8 100644
--- a/java/res/xml/key_styles_common.xml
+++ b/java/res/xml/key_styles_common.xml
@@ -160,27 +160,10 @@
         latin:keyLabelFlags="preserveCase"
         latin:keyActionFlags="noKeyPreview"
         latin:backgroundType="functional" />
-    <switch>
-        <!-- When this qwerty keyboard has no shortcut keys but shortcut key is enabled, then symbol
-             keyboard will have a shortcut key. That means we should use label_to_symbol_key label
-             and shortcut_for_label icon. -->
-        <case
-            latin:shortcutKeyOnSymbols="true"
-        >
-            <key-style
-                latin:styleName="baseForToSymbolKeyStyle"
-                latin:keyIcon="!icon/shortcut_for_label"
-                latin:keyLabel="!text/label_to_symbol_with_microphone_key"
-                latin:keyLabelFlags="withIconRight|preserveCase"
-                latin:parentStyle="baseForLayoutSwitchKeyStyle" />
-        </case>
-        <default>
-            <key-style
-                latin:styleName="baseForToSymbolKeyStyle"
-                latin:keyLabel="!text/label_to_symbol_key"
-                latin:parentStyle="baseForLayoutSwitchKeyStyle" />
-        </default>
-    </switch>
+    <key-style
+        latin:styleName="baseForToSymbolKeyStyle"
+        latin:keyLabel="!text/label_to_symbol_key"
+        latin:parentStyle="baseForLayoutSwitchKeyStyle" />
     <key-style
         latin:styleName="toSymbolKeyStyle"
         latin:code="!code/key_switch_alpha_symbol"
@@ -200,12 +183,6 @@
         latin:code="!code/key_shift"
         latin:parentStyle="baseForToSymbolKeyStyle" />
     <key-style
-        latin:styleName="punctuationKeyStyle"
-        latin:keyLabel="."
-        latin:keyLabelFlags="hasPopupHint"
-        latin:moreKeys="!text/more_keys_for_punctuation"
-        latin:backgroundType="functional" />
-    <key-style
         latin:styleName="comKeyStyle"
         latin:keyLabel="!text/keylabel_for_popular_domain"
         latin:keyLabelFlags="autoXScale|fontNormal|hasPopupHint|preserveCase"
diff --git a/java/res/xml/key_symbols_period.xml b/java/res/xml/key_symbols_period.xml
deleted file mode 100644
index 6efc9de..0000000
--- a/java/res/xml/key_symbols_period.xml
+++ /dev/null
@@ -1,47 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2013, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<merge
-    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
->
-    <!-- U+2105: "℅" CARE OF
-         U+2122: "™" TRADE MARK SIGN
-         U+00AE: "®" REGISTERED SIGN
-         U+00A9: "©" COPYRIGHT SIGN
-         U+00A7: "§" SECTION SIGN
-         U+00B6: "¶" PILCROW SIGN
-         U+002C: "," COMMA
-         U+2022: "•" BULLET -->
-    <!-- U+00B0: "°" DEGREE SIGN
-         U+2032: "′" PRIME
-         U+2033: "″" DOUBLE PRIME
-         U+2191: "↑" UPWARDS ARROW
-         U+2193: "↓" DOWNWARDS ARROW
-         U+2190: "←" LEFTWARDS ARROW
-         U+2192: "→" RIGHTWARDS ARROW
-         U+2026: "…" HORIZONTAL ELLIPSIS -->
-    <!-- U+0394: "Δ" GREEK CAPITAL LETTER DELTA
-         U+03A0: "Π" GREEK CAPITAL LETTER PI
-         U+03C0: "π" GREEK SMALL LETTER PI -->
-    <Key
-        latin:keyLabel="."
-        latin:keyLabelFlags="hasPopupHint"
-        latin:moreKeys="!fixedColumnOrder!8,&#x2105;,&#x2122;,&#x00AE;,&#x00A9;,&#x00A7;,&#x00B6;,\\,,&#x2022;,&#x00B0;,&#x2032;,&#x2033;,&#x2191;,&#x2193;,&#x2190;,&#x2192;,&#x2026;,!text/more_keys_for_bullet,&#x0394;,&#x03A0;,&#x03C0;" />
-</merge>
diff --git a/java/res/xml/keyboard_layout_set_swiss.xml b/java/res/xml/keyboard_layout_set_swiss.xml
new file mode 100644
index 0000000..e17a5ab
--- /dev/null
+++ b/java/res/xml/keyboard_layout_set_swiss.xml
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<KeyboardLayoutSet
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin">
+    <Element
+        latin:elementName="alphabet"
+        latin:elementKeyboard="@xml/kbd_swiss"
+        latin:enableProximityCharsCorrection="true" />
+    <Element
+        latin:elementName="symbols"
+        latin:elementKeyboard="@xml/kbd_symbols" />
+    <Element
+        latin:elementName="symbolsShifted"
+        latin:elementKeyboard="@xml/kbd_symbols_shift" />
+    <Element
+        latin:elementName="phone"
+        latin:elementKeyboard="@xml/kbd_phone" />
+    <Element
+        latin:elementName="phoneSymbols"
+        latin:elementKeyboard="@xml/kbd_phone_symbols" />
+    <Element
+        latin:elementName="number"
+        latin:elementKeyboard="@xml/kbd_number" />
+</KeyboardLayoutSet>
diff --git a/java/res/xml/keys_comma_period.xml b/java/res/xml/keys_comma_period.xml
deleted file mode 100644
index 1b51e45..0000000
--- a/java/res/xml/keys_comma_period.xml
+++ /dev/null
@@ -1,87 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-/*
-**
-** Copyright 2012, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License");
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<merge
-    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
->
-    <switch>
-        <case
-            latin:languageCode="ar"
-        >
-            <Key
-                latin:keyLabel="!text/keylabel_for_apostrophe"
-                latin:keyHintLabel="!text/keyhintlabel_for_apostrophe"
-                latin:moreKeys="!text/more_keys_for_apostrophe"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-            <Key
-                latin:keyLabel="."
-                latin:keyHintLabel="!text/keyhintlabel_for_arabic_diacritics"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="!text/more_keys_for_arabic_diacritics"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-        </case>
-        <case
-            latin:languageCode="fa"
-        >
-            <Key
-                latin:keyLabel="!text/keylabel_for_apostrophe"
-                latin:keyHintLabel="!text/keyhintlabel_for_apostrophe"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="!text/more_keys_for_apostrophe"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-            <Key
-                latin:keyLabel="."
-                latin:keyHintLabel="!text/keyhintlabel_for_arabic_diacritics"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:moreKeys="!text/more_keys_for_arabic_diacritics"
-                latin:backgroundType="functional"
-                latin:keyStyle="hasShiftedLetterHintStyle" />
-        </case>
-        <case
-            latin:languageCode="hy"
-        >
-            <!-- U+055D: "՝" ARMENIAN COMMA -->
-            <Key
-                latin:keyLabel="&#x055D;"
-                latin:backgroundType="functional" />
-            <!-- U+0589: "։" ARMENIAN FULL STOP -->
-            <Key
-                latin:keyLabel="&#x0589;"
-                latin:keyLabelFlags="hasPopupHint"
-                latin:backgroundType="functional"
-                latin:moreKeys="!text/more_keys_for_punctuation" />
-        </case>
-        <default>
-            <Key
-                latin:keyLabel="!text/keylabel_for_tablet_comma"
-                latin:keyHintLabel="!text/keyhintlabel_for_tablet_comma"
-                latin:backgroundType="functional"
-                latin:moreKeys="!text/more_keys_for_tablet_comma" />
-            <Key
-                latin:keyLabel="."
-                latin:keyHintLabel="!text/keyhintlabel_for_period"
-                latin:backgroundType="functional"
-                latin:moreKeys="!text/more_keys_for_period" />
-        </default>
-    </switch>
-</merge>
diff --git a/java/res/layout/key_preview_klp.xml b/java/res/xml/keys_comma_period_symbols.xml
similarity index 70%
copy from java/res/layout/key_preview_klp.xml
copy to java/res/xml/keys_comma_period_symbols.xml
index 160aeb9..cbdbe2e 100644
--- a/java/res/layout/key_preview_klp.xml
+++ b/java/res/xml/keys_comma_period_symbols.xml
@@ -18,10 +18,13 @@
 */
 -->
 
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:background="@drawable/keyboard_key_feedback_klp"
-    android:minWidth="32dp"
-    android:gravity="center"
-/>
+<merge
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
+>
+    <Key
+        latin:keyLabel="," />
+    <!-- U+2026: "…" HORIZONTAL ELLIPSIS -->
+    <Key
+        latin:keyLabel="."
+        latin:moreKeys="&#x2026;" />
+</merge>
diff --git a/java/res/xml/keys_pcqwerty4_right3.xml b/java/res/xml/keys_pcqwerty4_right3.xml
index e6084cb..a5d5a42 100644
--- a/java/res/xml/keys_pcqwerty4_right3.xml
+++ b/java/res/xml/keys_pcqwerty4_right3.xml
@@ -34,7 +34,7 @@
             <Key
                 latin:keyLabel="/"
                 latin:additionalMoreKeys="\?"
-                latin:moreKeys="!text/more_keys_for_symbols_question" />
+                latin:moreKeys="!text/more_keys_for_question" />
         </case>
         <!-- keyboardLayoutSetElement="alphabetManualShifted|alphabetShiftLocked|alphabetShiftLockShifted" -->
         <default>
@@ -52,7 +52,7 @@
                 latin:moreKeys="!fixedColumnOrder!3,&#x203A;,&#x2265;,&#x00BB;" />
             <Key
                 latin:keyLabel="\?"
-                latin:moreKeys="!text/more_keys_for_symbols_question" />
+                latin:moreKeys="!text/more_keys_for_question" />
         </default>
     </switch>
 </merge>
diff --git a/java/res/xml/method.xml b/java/res/xml/method.xml
index 0a27da9..c8e3c19 100644
--- a/java/res/xml/method.xml
+++ b/java/res/xml/method.xml
@@ -24,52 +24,54 @@
     keyboard_locale: script_name/keyboard_layout_set
     af: Afrikaans/qwerty
     ar: Arabic/arabic
-    (az: Azerbaijani/qwerty)  # disabled temporarily. waiting for string resources.
-    be: Belarusian/east_slavic
+    (az_AZ: Azerbaijani (Azerbaijan)/qwerty)  # disabled temporarily. waiting for string resources.
+    be_BY: Belarusian (Belarus)/east_slavic
     bg: Bulgarian/bulgarian
     bg: Bulgarian/bulgarian_bds
     ca: Catalan/spanish
     cs: Czech/qwertz
     da: Danish/nordic
     de: German/qwertz
+    de_CH: German (Switzerland)/swiss
     el: Greek/greek
-    en_US: English United States/qwerty
-    en_GB: English Great Britain/qwerty
+    en_US: English (United States)/qwerty
+    en_GB: English (Great Britain)/qwerty
     eo: Esperanto/spanish
     es: Spanish/spanish
-    es_US: Spanish United States/spanish
-    (es_419: Spanish Latin America/qwerty)
-    et_EE: Estonian/nordic
+    es_US: Spanish (United States)/spanish
+    (es_419: Spanish (Latin America)/qwerty)
+    et_EE: Estonian (Estonia)/nordic
     fa: Persian/arabic
     fi: Finnish/nordic
     fr: French/azerty
-    fr_CA: French Canada/qwerty
+    fr_CA: French (Canada)/qwerty
+    fr_CH: French (Switzerland)/swiss
     hi: Hindi/hindi
     hr: Croatian/qwertz
     hu: Hungarian/qwertz
-    hy_AM: Armenian Phonetic/armenian_phonetic
+    hy_AM: Armenian (Armenia) Phonetic/armenian_phonetic
     in: Indonesian/qwerty    # "id" is official language code of Indonesian.
     is: Icelandic/qwerty
     it: Italian/qwerty
     iw: Hebrew/hebrew        # "he" is official language code of Hebrew.
-    ka_GE: Georgian/georgian
+    ka_GE: Georgian (Georgia)/georgian
     (kk: Kazakh/east_slavic) # disabled temporarily. waiting for string resources.
-    km_KH: Khmer/khmer
+    km_KH: Khmer (Cambodia)/khmer
     ky: Kyrgyz/east_slavic
-    lo_LA: Lao/lao
+    lo_LA: Lao (Laos)/lao
     lt: Lithuanian/qwerty
     lv: Latvian/qwerty
     mk: Macedonian/south_slavic
-    mn_MN: Mongolian/mongolian
-    ms_MY: Malay/qwerty
+    mn_MN: Mongolian (Mongolia)/mongolian
+    ms_MY: Malay (Malaysia)/qwerty
     nb: Norwegian Bokmål/nordic
-    (ne: Nepali Romanized/nepali_romanized)  # disabled temporarily
-    (ne: Nepali Traditional/nepali_traditional)  # disabled temporarily
+    (ne_NP: Nepali (Nepal) Romanized/nepali_romanized)  # disabled temporarily
+    (ne_NP: Nepali (Nepal) Traditional/nepali_traditional)  # disabled temporarily
     nl: Dutch/qwerty
-    nl_BE: Dutch Belgium/azerty
+    nl_BE: Dutch (Belgium)/azerty
     pl: Polish/qwerty
-    pt_BR: Portuguese Brazil/qwerty
-    pt_PT: Portuguese Portugal/qwerty
+    pt_BR: Portuguese (Brazil)/qwerty
+    pt_PT: Portuguese (Portugal)/qwerty
     ro: Romanian/qwerty
     ru: Russian/east_slavic
     sk: Slovak/qwerty
@@ -88,19 +90,22 @@
     (zz: Emoji/emoji)
     -->
 <!-- TODO: use <lang>_keyboard icon instead of a common keyboard icon. -->
+<!-- TODO: Remove "AsciiCapable" from the extra values when we can stop supporting JB-MR1 -->
 <!-- Note: SupportTouchPositionCorrection extra value is obsolete and maintained for backward
      compatibility. -->
 <!-- If IME doesn't have an applicable subtype, the first subtype will be used as a default
      subtype.-->
 <input-method xmlns:android="http://schemas.android.com/apk/res/android"
         android:settingsActivity="com.android.inputmethod.latin.settings.SettingsActivity"
-        android:isDefault="@bool/im_is_default">
+        android:isDefault="@bool/im_is_default"
+        android:supportsSwitchingToNextInputMethod="true">
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_en_US"
             android:subtypeId="0xc9194f98"
             android:imeSubtypeLocale="en_US"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="TrySuppressingImeSwitcher,AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_en_GB"
@@ -108,6 +113,7 @@
             android:imeSubtypeLocale="en_GB"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="TrySuppressingImeSwitcher,AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -115,6 +121,7 @@
             android:imeSubtypeLocale="af"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -122,22 +129,25 @@
             android:imeSubtypeLocale="ar"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <!--
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
             android:subtypeId="0x70b0f974"
-            android:imeSubtypeLocale="az"
+            android:imeSubtypeLocale="az_AZ"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
             android:subtypeId="0x1dc3a859"
-            android:imeSubtypeLocale="be"
+            android:imeSubtypeLocale="be_BY"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=east_slavic,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -145,6 +155,7 @@
             android:imeSubtypeLocale="bg"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=bulgarian,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_bulgarian_bds"
@@ -152,6 +163,7 @@
             android:imeSubtypeLocale="bg"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=bulgarian_bds,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -159,6 +171,7 @@
             android:imeSubtypeLocale="ca"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=spanish,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -166,6 +179,7 @@
             android:imeSubtypeLocale="cs"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -173,6 +187,7 @@
             android:imeSubtypeLocale="da"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -180,6 +195,15 @@
             android:imeSubtypeLocale="de"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
+    />
+    <subtype android:icon="@drawable/ic_ime_switcher_dark"
+            android:label="@string/subtype_generic"
+            android:subtypeId="0x7acfd0aa"
+            android:imeSubtypeLocale="de_CH"
+            android:imeSubtypeMode="keyboard"
+            android:imeSubtypeExtraValue="KeyboardLayoutSet=swiss,AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -187,6 +211,7 @@
             android:imeSubtypeLocale="el"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=greek,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -194,6 +219,7 @@
             android:imeSubtypeLocale="eo"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=spanish,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -201,6 +227,7 @@
             android:imeSubtypeLocale="es"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_es_US"
@@ -208,6 +235,7 @@
             android:imeSubtypeLocale="es_US"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=spanish,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <!--
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -216,6 +244,7 @@
             android:imeSubtypeLocale="es_419"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=spanish,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -224,6 +253,7 @@
             android:imeSubtypeLocale="et_EE"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=nordic,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -231,6 +261,7 @@
             android:imeSubtypeLocale="fa"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=farsi,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -238,6 +269,7 @@
             android:imeSubtypeLocale="fi"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -245,6 +277,7 @@
             android:imeSubtypeLocale="fr"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -252,6 +285,15 @@
             android:imeSubtypeLocale="fr_CA"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
+    />
+    <subtype android:icon="@drawable/ic_ime_switcher_dark"
+            android:label="@string/subtype_generic"
+            android:subtypeId="0xeadc55f5"
+            android:imeSubtypeLocale="fr_CH"
+            android:imeSubtypeMode="keyboard"
+            android:imeSubtypeExtraValue="KeyboardLayoutSet=swiss,AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -259,6 +301,7 @@
             android:imeSubtypeLocale="hi"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=hindi,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -266,6 +309,7 @@
             android:imeSubtypeLocale="hr"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -273,6 +317,7 @@
             android:imeSubtypeLocale="hu"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -280,6 +325,7 @@
             android:imeSubtypeLocale="hy_AM"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=armenian_phonetic,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <!-- Java uses the deprecated "in" code instead of the standard "id" code for Indonesian. -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -288,6 +334,7 @@
             android:imeSubtypeLocale="in"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -295,6 +342,7 @@
             android:imeSubtypeLocale="is"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -302,6 +350,7 @@
             android:imeSubtypeLocale="it"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <!-- Java uses the deprecated "iw" code instead of the standard "he" code for Hebrew. -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -310,6 +359,7 @@
             android:imeSubtypeLocale="iw"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -317,6 +367,7 @@
             android:imeSubtypeLocale="ka_GE"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=georgian,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <!--
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -325,6 +376,7 @@
             android:imeSubtypeLocale="kk"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=east_slavic,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -333,6 +385,7 @@
             android:imeSubtypeLocale="km_KH"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=khmer,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -340,6 +393,7 @@
             android:imeSubtypeLocale="ky"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=east_slavic,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -347,6 +401,7 @@
             android:imeSubtypeLocale="lo_LA"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=lao,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -354,6 +409,7 @@
             android:imeSubtypeLocale="lt"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -361,6 +417,7 @@
             android:imeSubtypeLocale="lv"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -368,6 +425,7 @@
             android:imeSubtypeLocale="mk"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=south_slavic,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -375,6 +433,7 @@
             android:imeSubtypeLocale="mn_MN"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=mongolian,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -382,6 +441,7 @@
             android:imeSubtypeLocale="ms_MY"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -389,21 +449,24 @@
             android:imeSubtypeLocale="nb"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <!--
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
             android:subtypeId="0xd80a4cee"
-            android:imeSubtypeLocale="ne"
+            android:imeSubtypeLocale="ne_NP"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=nepali_romanized,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_nepali_traditional"
             android:subtypeId="0x5fafea88"
-            android:imeSubtypeLocale="ne"
+            android:imeSubtypeLocale="ne_NP"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=nepali_traditional,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -412,6 +475,7 @@
             android:imeSubtypeLocale="nl"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -419,6 +483,7 @@
             android:imeSubtypeLocale="nl_BE"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=azerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -426,6 +491,7 @@
             android:imeSubtypeLocale="pl"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -433,6 +499,7 @@
             android:imeSubtypeLocale="pt_BR"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -440,6 +507,7 @@
             android:imeSubtypeLocale="pt_PT"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -447,6 +515,7 @@
             android:imeSubtypeLocale="ro"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -454,6 +523,7 @@
             android:imeSubtypeLocale="ru"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -461,6 +531,7 @@
             android:imeSubtypeLocale="sk"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -468,6 +539,7 @@
             android:imeSubtypeLocale="sl"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -475,6 +547,7 @@
             android:imeSubtypeLocale="sr"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <!-- TODO: Uncomment once we can handle IETF language tag with script name specified.
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -483,6 +556,7 @@
             android:imeSubtypeLocale="sr"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_serbian_latin"
@@ -490,6 +564,7 @@
             android:imeSubtypeLocale="sr-Latn"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
@@ -498,6 +573,7 @@
             android:imeSubtypeLocale="sv"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -505,6 +581,7 @@
             android:imeSubtypeLocale="sw"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -512,6 +589,7 @@
             android:imeSubtypeLocale="th"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=thai,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -519,6 +597,7 @@
             android:imeSubtypeLocale="tl"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=spanish,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -526,6 +605,7 @@
             android:imeSubtypeLocale="tr"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="AsciiCapable,SupportTouchPositionCorrection,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -533,6 +613,7 @@
             android:imeSubtypeLocale="uk"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=east_slavic,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -540,6 +621,7 @@
             android:imeSubtypeLocale="vi"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
@@ -547,6 +629,7 @@
             android:imeSubtypeLocale="zu"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_no_language_qwerty"
@@ -554,6 +637,7 @@
             android:imeSubtypeLocale="zz"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=qwerty,AsciiCapable,EnabledWhenDefaultIsNotAsciiCapable,EmojiCapable"
+            android:isAsciiCapable="true"
     />
     <!-- Emoji subtype has to be an addtional subtype added at boot time because ICS doesn't
          support Emoji. -->
@@ -564,6 +648,7 @@
             android:imeSubtypeLocale="zz"
             android:imeSubtypeMode="keyboard"
             android:imeSubtypeExtraValue="KeyboardLayoutSet=emoji,EmojiCapable"
+            android:isAsciiCapable="false"
     />
     -->
 </input-method>
diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index bf3b623..49f0718 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -89,6 +89,12 @@
             android:entryValues="@array/prefs_suggestion_visibility_values"
             android:entries="@array/prefs_suggestion_visibilities"
             android:defaultValue="@string/prefs_suggestion_visibility_default_value" />
+        <CheckBoxPreference
+            android:key="pref_key_use_personalized_dicts"
+            android:title="@string/use_personalized_dicts"
+            android:summary="@string/use_personalized_dicts_summary"
+            android:persistent="true"
+            android:defaultValue="true" />
     </PreferenceCategory>
     <PreferenceCategory
         android:title="@string/gesture_typing_category"
diff --git a/java/res/xml/row_pcqwerty5.xml b/java/res/xml/row_pcqwerty5.xml
index 4ec908b..0a3f4d2 100644
--- a/java/res/xml/row_pcqwerty5.xml
+++ b/java/res/xml/row_pcqwerty5.xml
@@ -28,7 +28,7 @@
             latin:keyWidth="11.538%p" />
         <switch>
             <case
-                latin:shortcutKeyEnabled="true"
+                latin:supportsSwitchingToShortcutIme="true"
             >
                 <Key
                     latin:keyStyle="shortcutKeyStyle"
diff --git a/java/res/xml/row_qwerty4.xml b/java/res/xml/row_qwerty4.xml
index 578bc12..509092d 100644
--- a/java/res/xml/row_qwerty4.xml
+++ b/java/res/xml/row_qwerty4.xml
@@ -32,36 +32,8 @@
         <include
             latin:keyXPos="25%p"
             latin:keyboardLayout="@xml/key_space_5kw" />
-        <switch>
-            <case
-                latin:languageCode="ar|fa"
-            >
-                <Key
-                    latin:keyHintLabel="!text/keyhintlabel_for_arabic_diacritics"
-                    latin:keyLabelFlags="hasPopupHint|hasShiftedLetterHint"
-                    latin:moreKeys="!text/more_keys_for_arabic_diacritics"
-                    latin:keyStyle="punctuationKeyStyle" />
-            </case>
-            <case
-                latin:languageCode="ne"
-                latin:keyboardLayoutSet="nepali_traditional"
-            >
-                <include
-                    latin:keyboardLayout="@xml/key_nepali_traditional_period" />
-            </case>
-            <case
-                latin:languageCode="hy"
-            >
-                <!-- U+0589: "։" ARMENIAN FULL STOP -->
-                <Key
-                    latin:keyLabel="&#x0589;"
-                    latin:keyStyle="punctuationKeyStyle" />
-            </case>
-            <default>
-                <Key
-                    latin:keyStyle="punctuationKeyStyle" />
-            </default>
-        </switch>
+        <include
+            latin:keyboardLayout="@xml/key_period" />
         <Key
             latin:keyStyle="enterKeyStyle"
             latin:keyWidth="fillRight" />
diff --git a/java/res/xml/row_symbols4.xml b/java/res/xml/row_symbols4.xml
index fbfdc5f..09d2a19 100644
--- a/java/res/xml/row_symbols4.xml
+++ b/java/res/xml/row_symbols4.xml
@@ -19,24 +19,12 @@
 -->
 
 <merge xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin" >
-
     <Key
-        latin:backgroundType="functional"
         latin:keyLabel="_" />
     <Key
-        latin:backgroundType="functional"
         latin:keyLabel="/" />
-
-    <switch>
-        <case latin:hasShortcutKey="true" >
-            <Key latin:keyStyle="shortcutKeyStyle" />
-        </case>
-        <!-- latin:hasShortcutKey="false" -->
-        <default>
-        </default>
-    </switch>
-
-    <include latin:keyboardLayout="@xml/key_space_symbols" />
-    <include latin:keyboardLayout="@xml/keys_comma_period" />
-
+    <include
+        latin:keyboardLayout="@xml/key_space_symbols" />
+    <include
+        latin:keyboardLayout="@xml/keys_comma_period_symbols" />
 </merge>
diff --git a/java/res/xml/row_symbols_shift4.xml b/java/res/xml/row_symbols_shift4.xml
index 0909374..f75575b 100644
--- a/java/res/xml/row_symbols_shift4.xml
+++ b/java/res/xml/row_symbols_shift4.xml
@@ -22,5 +22,5 @@
     <include latin:keyboardLayout="@xml/keys_less_greater" />
     <include
         latin:keyboardLayout="@xml/key_space_symbols" />
-    <include latin:keyboardLayout="@xml/keys_comma_period" />
+    <include latin:keyboardLayout="@xml/keys_comma_period_symbols" />
 </merge>
diff --git a/java/res/xml/rowkeys_armenian_phonetic2.xml b/java/res/xml/rowkeys_armenian_phonetic2.xml
index 5dcabc3..3764d0d 100644
--- a/java/res/xml/rowkeys_armenian_phonetic2.xml
+++ b/java/res/xml/rowkeys_armenian_phonetic2.xml
@@ -34,6 +34,7 @@
     <Key
         latin:keyLabel="&#x0565;"
         latin:moreKeys="&#x0587;"
+        latin:keyHintLabel="&#x0587;"
         latin:keyLabelFlags="fontNormal" />
     <!-- U+057C: "ռ" ARMENIAN SMALL LETTER RA -->
     <Key
diff --git a/java/res/xml/rowkeys_khmer1.xml b/java/res/xml/rowkeys_khmer1.xml
index 25da664..05d1a86 100644
--- a/java/res/xml/rowkeys_khmer1.xml
+++ b/java/res/xml/rowkeys_khmer1.xml
@@ -64,6 +64,7 @@
             <Key
                 latin:keyLabel="&#x17D0;"
                 latin:keyHintLabel="&#x17DA;"
+                latin:keyHintLabelVerticalAdjustment="-30%"
                 latin:moreKeys="&#x17DA;"
                 latin:keyLabelFlags="fontNormal" />
             <!-- U+17CF: "៏" KHMER SIGN AHSDA -->
diff --git a/java/res/xml/rowkeys_khmer2.xml b/java/res/xml/rowkeys_khmer2.xml
index cba2d3b..801f23f 100644
--- a/java/res/xml/rowkeys_khmer2.xml
+++ b/java/res/xml/rowkeys_khmer2.xml
@@ -31,12 +31,13 @@
                 latin:keyLabel="&#x1788;"
                 latin:keyHintLabel="&#x17DC;"
                 latin:moreKeys="&#x17DC;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|autoScale" />
             <!-- U+17BA: "ឺ" KHMER VOWEL SIGN YY
                  U+17DD: "៝" KHMER SIGN ATTHACAN -->
             <Key
                 latin:keyLabel="&#x17BA;"
                 latin:keyHintLabel="&#x17DD;"
+                latin:keyHintLabelVerticalAdjustment="40%"
                 latin:moreKeys="&#x17DD;"
                 latin:keyLabelFlags="fontNormal" />
             <!-- U+17C2: "ែ" KHMER VOWEL SIGN AE -->
@@ -69,7 +70,7 @@
             <!-- U+17C5: "ៅ" KHMER VOWEL SIGN AU -->
             <Key
                 latin:keyLabel="&#x17C5;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|autoScale" />
             <!-- U+1797: "ភ" KHMER LETTER PHO -->
             <Key
                 latin:keyLabel="&#x1797;"
@@ -77,7 +78,7 @@
             <!-- U+17BF: "ឿ" KHMER VOWEL SIGN YA -->
             <Key
                 latin:keyLabel="&#x17BF;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|autoScale" />
             <!-- U+17B0: "ឰ" KHMER INDEPENDENT VOWEL QAI -->
             <Key
                 latin:keyLabel="&#x17B0;"
@@ -119,7 +120,7 @@
             <!-- U+17C4: "ោ" KHMER VOWEL SIGN OO -->
             <Key
                 latin:keyLabel="&#x17C4;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|autoScale" />
             <!-- U+1795: "ផ" KHMER LETTER PHA -->
             <Key
                 latin:keyLabel="&#x1795;"
@@ -127,7 +128,7 @@
             <!-- U+17C0: "ៀ" KHMER VOWEL SIGN IE -->
             <Key
                 latin:keyLabel="&#x17C0;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|autoScale" />
             <!-- U+17AA: "ឪ" KHMER INDEPENDENT VOWEL QUUV
                  U+17A7: "ឧ" KHMER INDEPENDENT VOWEL QU
                  U+17B1: "ឱ" KHMER INDEPENDENT VOWEL QOO TYPE ONE
diff --git a/java/res/xml/rowkeys_khmer3.xml b/java/res/xml/rowkeys_khmer3.xml
index ff6c9ca..f35ba5c 100644
--- a/java/res/xml/rowkeys_khmer3.xml
+++ b/java/res/xml/rowkeys_khmer3.xml
@@ -70,7 +70,7 @@
             <!-- U+17C4/U+17C7: "ោះ" KHMER VOWEL SIGN OO/KHMER SIGN REAHMUK -->
             <Key
                 latin:keyLabel="&#x17C4;&#x17C7;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|followKeyLetterRatio|autoScale" />
             <!-- U+17C9: "៉" KHMER SIGN MUUSIKATOAN -->
             <Key
                 latin:keyLabel="&#x17C9;"
diff --git a/java/res/xml/rowkeys_khmer4.xml b/java/res/xml/rowkeys_khmer4.xml
index fe6c591..598aed8 100644
--- a/java/res/xml/rowkeys_khmer4.xml
+++ b/java/res/xml/rowkeys_khmer4.xml
@@ -40,7 +40,7 @@
             <!-- U+17C1/U+17C7: "េះ" KHMER VOWEL SIGN E/KHMER SIGN REAHMUK -->
             <Key
                 latin:keyLabel="&#x17C1;&#x17C7;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|followKeyLetterRatio|autoScale" />
             <!-- U+1796: "ព" KHMER LETTER PO
                  U+179E: "ឞ" KHMER LETTER SSO -->
             <Key
@@ -51,7 +51,7 @@
             <!-- U+178E: "ណ" KHMER LETTER NNO -->
             <Key
                 latin:keyLabel="&#x178E;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|autoScale" />
             <!-- U+17C6: "ំ" KHMER SIGN NIKAHIT -->
             <Key
                 latin:keyLabel="&#x17C6;"
diff --git a/java/res/xml/rowkeys_pcqwerty1.xml b/java/res/xml/rowkeys_pcqwerty1.xml
index de548d0..1ac264a 100644
--- a/java/res/xml/rowkeys_pcqwerty1.xml
+++ b/java/res/xml/rowkeys_pcqwerty1.xml
@@ -26,7 +26,7 @@
         latin:additionalMoreKeys="~" />
     <Key
         latin:keyLabel="1"
-        latin:additionalMoreKeys="!,!text/more_keys_for_symbols_exclamation"
+        latin:additionalMoreKeys="!,!text/more_keys_for_exclamation"
         latin:moreKeys="!text/more_keys_for_symbols_1" />
     <Key
         latin:keyLabel="2"
diff --git a/java/res/xml/rowkeys_pcqwerty1_shift.xml b/java/res/xml/rowkeys_pcqwerty1_shift.xml
index bc39f94..718acfd 100644
--- a/java/res/xml/rowkeys_pcqwerty1_shift.xml
+++ b/java/res/xml/rowkeys_pcqwerty1_shift.xml
@@ -25,7 +25,7 @@
         latin:keyLabel="~" />
     <Key
         latin:keyLabel="!"
-        latin:additionalMoreKeys="!text/more_keys_for_symbols_exclamation" />
+        latin:additionalMoreKeys="!text/more_keys_for_exclamation" />
     <Key
         latin:keyLabel="\@" />
     <Key
diff --git a/java/res/layout/key_preview_klp.xml b/java/res/xml/rowkeys_swiss1.xml
similarity index 68%
copy from java/res/layout/key_preview_klp.xml
copy to java/res/xml/rowkeys_swiss1.xml
index 160aeb9..e3b8426 100644
--- a/java/res/layout/key_preview_klp.xml
+++ b/java/res/xml/rowkeys_swiss1.xml
@@ -18,10 +18,12 @@
 */
 -->
 
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:background="@drawable/keyboard_key_feedback_klp"
-    android:minWidth="32dp"
-    android:gravity="center"
-/>
+<merge
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
+>
+    <include
+        latin:keyboardLayout="@xml/rowkeys_qwertz1" />
+    <Key
+        latin:keyLabel="!text/keylabel_for_swiss_row1_11"
+        latin:moreKeys="!text/more_keys_for_swiss_row1_11" />
+</merge>
diff --git a/java/res/xml/key_space_3kw.xml b/java/res/xml/rowkeys_swiss2.xml
similarity index 61%
rename from java/res/xml/key_space_3kw.xml
rename to java/res/xml/rowkeys_swiss2.xml
index 20ec882..5364a44 100644
--- a/java/res/xml/key_space_3kw.xml
+++ b/java/res/xml/rowkeys_swiss2.xml
@@ -21,21 +21,12 @@
 <merge
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
 >
-    <switch>
-        <case
-            latin:languageSwitchKeyEnabled="true"
-        >
-            <Key
-                latin:keyStyle="languageSwitchKeyStyle" />
-            <Key
-                latin:keyStyle="spaceKeyStyle"
-                latin:keyWidth="20%p" />
-        </case>
-        <!-- languageSwitchKeyEnabled="false" -->
-        <default>
-            <Key
-                latin:keyStyle="spaceKeyStyle"
-                latin:keyWidth="30%p" />
-        </default>
-    </switch>
+    <include
+        latin:keyboardLayout="@xml/rowkeys_qwerty2" />
+    <Key
+        latin:keyLabel="!text/keylabel_for_swiss_row2_10"
+        latin:moreKeys="!text/more_keys_for_swiss_row2_10" />
+    <Key
+        latin:keyLabel="!text/keylabel_for_swiss_row2_11"
+        latin:moreKeys="!text/more_keys_for_swiss_row2_11" />
 </merge>
diff --git a/java/res/xml/rowkeys_symbols3.xml b/java/res/xml/rowkeys_symbols3.xml
index 074078c..e525dc4 100644
--- a/java/res/xml/rowkeys_symbols3.xml
+++ b/java/res/xml/rowkeys_symbols3.xml
@@ -55,8 +55,8 @@
         latin:moreKeys="!text/more_keys_for_symbols_semicolon" />
     <Key
         latin:keyLabel="!"
-        latin:moreKeys="!text/more_keys_for_symbols_exclamation" />
+        latin:moreKeys="!text/more_keys_for_exclamation" />
     <Key
         latin:keyLabel="!text/keylabel_for_symbols_question"
-        latin:moreKeys="!text/more_keys_for_symbols_question" />
+        latin:moreKeys="!text/more_keys_for_question" />
 </merge>
diff --git a/java/res/xml/rows_swiss.xml b/java/res/xml/rows_swiss.xml
new file mode 100644
index 0000000..03e4129
--- /dev/null
+++ b/java/res/xml/rows_swiss.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2013, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<merge
+    xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
+>
+    <include
+        latin:keyboardLayout="@xml/key_styles_common" />
+    <Row
+        latin:keyWidth="9.091%p"
+    >
+        <include
+            latin:keyboardLayout="@xml/rowkeys_swiss1" />
+    </Row>
+    <Row
+        latin:keyWidth="9.091%p"
+    >
+        <include
+            latin:keyboardLayout="@xml/rowkeys_swiss2" />
+    </Row>
+    <Row
+        latin:keyWidth="9.2%p"
+    >
+        <Key
+            latin:keyStyle="shiftKeyStyle"
+            latin:keyWidth="15%p"
+            latin:visualInsetsRight="1%p" />
+        <Spacer
+            latin:keyWidth="2.8%p" />
+        <include
+            latin:keyboardLayout="@xml/rowkeys_qwertz3" />
+        <Key
+            latin:keyStyle="deleteKeyStyle"
+            latin:keyXPos="-15%p"
+            latin:keyWidth="fillRight"
+            latin:visualInsetsLeft="1%p" />
+    </Row>
+    <include
+        latin:keyboardLayout="@xml/row_qwerty4" />
+</merge>
diff --git a/java/res/xml/rows_symbols.xml b/java/res/xml/rows_symbols.xml
index d0606c6..6fd876f 100644
--- a/java/res/xml/rows_symbols.xml
+++ b/java/res/xml/rows_symbols.xml
@@ -54,6 +54,7 @@
     </Row>
     <Row
         latin:keyWidth="10%p"
+        latin:backgroundType="functional"
     >
         <Key
             latin:keyStyle="toAlphaKeyStyle"
diff --git a/java/res/xml/rows_symbols_shift.xml b/java/res/xml/rows_symbols_shift.xml
index c4bdb9f..64f6e61 100644
--- a/java/res/xml/rows_symbols_shift.xml
+++ b/java/res/xml/rows_symbols_shift.xml
@@ -54,6 +54,7 @@
     </Row>
     <Row
         latin:keyWidth="10%p"
+        latin:backgroundType="functional"
     >
         <Key
             latin:keyStyle="toAlphaKeyStyle"
diff --git a/java/src/com/android/inputmethod/accessibility/AccessibleKeyboardViewProxy.java b/java/src/com/android/inputmethod/accessibility/AccessibleKeyboardViewProxy.java
index 73896df..d0d5399 100644
--- a/java/src/com/android/inputmethod/accessibility/AccessibleKeyboardViewProxy.java
+++ b/java/src/com/android/inputmethod/accessibility/AccessibleKeyboardViewProxy.java
@@ -29,10 +29,10 @@
 import android.view.accessibility.AccessibilityEvent;
 
 import com.android.inputmethod.keyboard.Key;
+import com.android.inputmethod.keyboard.KeyDetector;
 import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.keyboard.KeyboardId;
 import com.android.inputmethod.keyboard.MainKeyboardView;
-import com.android.inputmethod.keyboard.PointerTracker;
 import com.android.inputmethod.latin.R;
 
 public final class AccessibleKeyboardViewProxy extends AccessibilityDelegateCompat {
@@ -82,7 +82,7 @@
     private void initInternal(final InputMethodService inputMethod) {
         mInputMethod = inputMethod;
         mEdgeSlop = inputMethod.getResources().getDimensionPixelSize(
-                R.dimen.accessibility_edge_slop);
+                R.dimen.config_accessibility_edge_slop);
     }
 
     /**
@@ -220,9 +220,11 @@
      * Receives hover events when touch exploration is turned on in SDK versions ICS and higher.
      *
      * @param event The hover event.
+     * @param keyDetector The {@link KeyDetector} to determine on which key the <code>event</code>
+     *     is hovering.
      * @return {@code true} if the event is handled
      */
-    public boolean dispatchHoverEvent(final MotionEvent event, final PointerTracker tracker) {
+    public boolean dispatchHoverEvent(final MotionEvent event, final KeyDetector keyDetector) {
         if (mView == null) {
             return false;
         }
@@ -233,7 +235,7 @@
         final Key key;
 
         if (pointInView(x, y)) {
-            key = tracker.getKeyOn(x, y);
+            key = keyDetector.detectHitKey(x, y);
         } else {
             key = null;
         }
diff --git a/java/src/com/android/inputmethod/compat/AppWorkaroundsUtils.java b/java/src/com/android/inputmethod/compat/AppWorkaroundsUtils.java
index 7e9e2e3..6e43cc9 100644
--- a/java/src/com/android/inputmethod/compat/AppWorkaroundsUtils.java
+++ b/java/src/com/android/inputmethod/compat/AppWorkaroundsUtils.java
@@ -23,10 +23,10 @@
  * A class to encapsulate work-arounds specific to particular apps.
  */
 public class AppWorkaroundsUtils {
-    private PackageInfo mPackageInfo; // May be null
-    private boolean mIsBrokenByRecorrection = false;
+    private final PackageInfo mPackageInfo; // May be null
+    private final boolean mIsBrokenByRecorrection;
 
-    public void setPackageInfo(final PackageInfo packageInfo) {
+    public AppWorkaroundsUtils(final PackageInfo packageInfo) {
         mPackageInfo = packageInfo;
         mIsBrokenByRecorrection = AppWorkaroundsHelper.evaluateIsBrokenByRecorrection(
                 packageInfo);
diff --git a/java/src/com/android/inputmethod/compat/SuggestionSpanUtils.java b/java/src/com/android/inputmethod/compat/SuggestionSpanUtils.java
index 55282c5..b8d1651 100644
--- a/java/src/com/android/inputmethod/compat/SuggestionSpanUtils.java
+++ b/java/src/com/android/inputmethod/compat/SuggestionSpanUtils.java
@@ -23,8 +23,10 @@
 import android.text.TextUtils;
 import android.text.style.SuggestionSpan;
 
+import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.SuggestedWords;
+import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.SuggestionSpanPickedNotificationReceiver;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 
@@ -66,30 +68,42 @@
     }
 
     public static CharSequence getTextWithSuggestionSpan(final Context context,
-            final String pickedWord, final SuggestedWords suggestedWords,
-            final boolean dictionaryAvailable) {
-        if (!dictionaryAvailable || TextUtils.isEmpty(pickedWord) || suggestedWords.isEmpty()
+            final String pickedWord, final SuggestedWords suggestedWords) {
+        if (TextUtils.isEmpty(pickedWord) || suggestedWords.isEmpty()
                 || suggestedWords.mIsPrediction || suggestedWords.mIsPunctuationSuggestions) {
             return pickedWord;
         }
 
-        final Spannable spannable = new SpannableString(pickedWord);
+        boolean hasSuggestionFromMainDictionary = false;
         final ArrayList<String> suggestionsList = CollectionUtils.newArrayList();
         for (int i = 0; i < suggestedWords.size(); ++i) {
             if (suggestionsList.size() >= SuggestionSpan.SUGGESTIONS_MAX_SIZE) {
                 break;
             }
+            final SuggestedWordInfo info = suggestedWords.getInfo(i);
+            if (info.mKind == SuggestedWordInfo.KIND_PREDICTION) {
+                continue;
+            }
+            if (info.mSourceDict.mDictType == Dictionary.TYPE_MAIN) {
+                hasSuggestionFromMainDictionary = true;
+            }
             final String word = suggestedWords.getWord(i);
             if (!TextUtils.equals(pickedWord, word)) {
                 suggestionsList.add(word.toString());
             }
         }
+        if (!hasSuggestionFromMainDictionary) {
+            // If we don't have any suggestions from the dictionary, it probably looks bad
+            // enough as it is already because suggestions come pretty much only from contacts.
+            // Let's not embed these bad suggestions in the text view so as to avoid using
+            // them with recorrection.
+            return pickedWord;
+        }
 
-        // TODO: We should avoid adding suggestion span candidates that came from the bigram
-        // prediction.
         final SuggestionSpan suggestionSpan = new SuggestionSpan(context, null /* locale */,
                 suggestionsList.toArray(new String[suggestionsList.size()]), 0 /* flags */,
                 SuggestionSpanPickedNotificationReceiver.class);
+        final Spannable spannable = new SpannableString(pickedWord);
         spannable.setSpan(suggestionSpan, 0, pickedWord.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
         return spannable;
     }
diff --git a/java/src/com/android/inputmethod/keyboard/EmojiCategoryPageIndicatorView.java b/java/src/com/android/inputmethod/keyboard/EmojiCategoryPageIndicatorView.java
index e23131a..d56a3cf 100644
--- a/java/src/com/android/inputmethod/keyboard/EmojiCategoryPageIndicatorView.java
+++ b/java/src/com/android/inputmethod/keyboard/EmojiCategoryPageIndicatorView.java
@@ -31,17 +31,17 @@
     private int mCurrentCategoryPageId = 0;
     private float mOffset = 0.0f;
 
-    public EmojiCategoryPageIndicatorView(Context context) {
+    public EmojiCategoryPageIndicatorView(final Context context) {
         this(context, null /* attrs */);
     }
 
-    public EmojiCategoryPageIndicatorView(Context context, AttributeSet attrs) {
+    public EmojiCategoryPageIndicatorView(final Context context, final AttributeSet attrs) {
         super(context, attrs);
         mPaint.setColor(context.getResources().getColor(
                 R.color.emoji_category_page_id_view_foreground));
     }
 
-    public void setCategoryPageId(int size, int id, float offset) {
+    public void setCategoryPageId(final int size, final int id, final float offset) {
         mCategoryPageSize = size;
         mCurrentCategoryPageId = id;
         mOffset = offset;
@@ -49,7 +49,7 @@
     }
 
     @Override
-    protected void onDraw(Canvas canvas) {
+    protected void onDraw(final Canvas canvas) {
         if (mCategoryPageSize <= 1) {
             // If the category is not set yet or contains only one category,
             // just clear and return.
diff --git a/java/src/com/android/inputmethod/keyboard/EmojiPalettesView.java b/java/src/com/android/inputmethod/keyboard/EmojiPalettesView.java
index f123735..ff0d538 100644
--- a/java/src/com/android/inputmethod/keyboard/EmojiPalettesView.java
+++ b/java/src/com/android/inputmethod/keyboard/EmojiPalettesView.java
@@ -44,8 +44,8 @@
 import android.widget.TextView;
 
 import com.android.inputmethod.keyboard.internal.DynamicGridKeyboard;
-import com.android.inputmethod.keyboard.internal.ScrollKeyboardView;
-import com.android.inputmethod.keyboard.internal.ScrollViewWithNotifier;
+import com.android.inputmethod.keyboard.internal.EmojiLayoutParams;
+import com.android.inputmethod.keyboard.internal.EmojiPageKeyboardView;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.SubtypeSwitcher;
@@ -72,15 +72,15 @@
  */
 public final class EmojiPalettesView extends LinearLayout implements OnTabChangeListener,
         ViewPager.OnPageChangeListener, View.OnClickListener,
-        ScrollKeyboardView.OnKeyClickListener {
-    private static final String TAG = EmojiPalettesView.class.getSimpleName();
+        EmojiPageKeyboardView.OnKeyClickListener {
+    static final String TAG = EmojiPalettesView.class.getSimpleName();
     private static final boolean DEBUG_PAGER = false;
     private final int mKeyBackgroundId;
     private final int mEmojiFunctionalKeyBackgroundId;
-    private final KeyboardLayoutSet mLayoutSet;
     private final ColorStateList mTabLabelColor;
     private final DeleteKeyOnTouchListener mDeleteKeyOnTouchListener;
     private EmojiPalettesAdapter mEmojiPalettesAdapter;
+    private final EmojiLayoutParams mEmojiLayoutParams;
 
     private TabHost mTabHost;
     private ViewPager mEmojiPager;
@@ -149,7 +149,7 @@
         public EmojiCategory(final SharedPreferences prefs, final Resources res,
                 final KeyboardLayoutSet layoutSet) {
             mPrefs = prefs;
-            mMaxPageKeyCount = res.getInteger(R.integer.emoji_keyboard_max_key_count);
+            mMaxPageKeyCount = res.getInteger(R.integer.config_emoji_keyboard_max_page_key_count);
             mLayoutSet = layoutSet;
             for (int i = 0; i < sCategoryName.length; ++i) {
                 mCategoryNameToIdMap.put(sCategoryName[i], i);
@@ -174,7 +174,7 @@
                     .loadRecentKeys(mCategoryKeyboardMap.values());
         }
 
-        private void addShownCategoryId(int categoryId) {
+        private void addShownCategoryId(final int categoryId) {
             // Load a keyboard of categoryId
             getKeyboard(categoryId, 0 /* cagetoryPageId */);
             final CategoryProperties properties =
@@ -182,20 +182,20 @@
             mShownCategories.add(properties);
         }
 
-        public String getCategoryName(int categoryId, int categoryPageId) {
+        public String getCategoryName(final int categoryId, final int categoryPageId) {
             return sCategoryName[categoryId] + "-" + categoryPageId;
         }
 
-        public int getCategoryId(String name) {
+        public int getCategoryId(final String name) {
             final String[] strings = name.split("-");
             return mCategoryNameToIdMap.get(strings[0]);
         }
 
-        public int getCategoryIcon(int categoryId) {
+        public int getCategoryIcon(final int categoryId) {
             return sCategoryIcon[categoryId];
         }
 
-        public String getCategoryLabel(int categoryId) {
+        public String getCategoryLabel(final int categoryId) {
             return sCategoryLabel[categoryId];
         }
 
@@ -211,7 +211,7 @@
             return getCategoryPageSize(mCurrentCategoryId);
         }
 
-        public int getCategoryPageSize(int categoryId) {
+        public int getCategoryPageSize(final int categoryId) {
             for (final CategoryProperties prop : mShownCategories) {
                 if (prop.mCategoryId == categoryId) {
                     return prop.mPageCount;
@@ -222,12 +222,12 @@
             return 0;
         }
 
-        public void setCurrentCategoryId(int categoryId) {
+        public void setCurrentCategoryId(final int categoryId) {
             mCurrentCategoryId = categoryId;
             Settings.writeLastShownEmojiCategoryId(mPrefs, categoryId);
         }
 
-        public void setCurrentCategoryPageId(int id) {
+        public void setCurrentCategoryPageId(final int id) {
             mCurrentCategoryPageId = id;
         }
 
@@ -244,7 +244,7 @@
             return mCurrentCategoryId == CATEGORY_ID_RECENTS;
         }
 
-        public int getTabIdFromCategoryId(int categoryId) {
+        public int getTabIdFromCategoryId(final int categoryId) {
             for (int i = 0; i < mShownCategories.size(); ++i) {
                 if (mShownCategories.get(i).mCategoryId == categoryId) {
                     return i;
@@ -255,7 +255,7 @@
         }
 
         // Returns the view pager's page position for the categoryId
-        public int getPageIdFromCategoryId(int categoryId) {
+        public int getPageIdFromCategoryId(final int categoryId) {
             final int lastSavedCategoryPageId =
                     Settings.readLastTypedEmojiCategoryPageId(mPrefs, categoryId);
             int sum = 0;
@@ -274,7 +274,7 @@
             return getTabIdFromCategoryId(CATEGORY_ID_RECENTS);
         }
 
-        private int getCategoryPageCount(int categoryId) {
+        private int getCategoryPageCount(final int categoryId) {
             final Keyboard keyboard = mLayoutSet.getKeyboard(sCategoryElementId[categoryId]);
             return (keyboard.getKeys().length - 1) / mMaxPageKeyCount + 1;
         }
@@ -283,9 +283,9 @@
         // position. The category page id is numbered in each category. And the view page position
         // is the position of the current shown page in the view pager which contains all pages of
         // all categories.
-        public Pair<Integer, Integer> getCategoryIdAndPageIdFromPagePosition(int position) {
+        public Pair<Integer, Integer> getCategoryIdAndPageIdFromPagePosition(final int position) {
             int sum = 0;
-            for (CategoryProperties properties : mShownCategories) {
+            for (final CategoryProperties properties : mShownCategories) {
                 final int temp = sum;
                 sum += properties.mPageCount;
                 if (sum > position) {
@@ -296,7 +296,7 @@
         }
 
         // Returns a keyboard from the view pager's page position.
-        public DynamicGridKeyboard getKeyboardFromPagePosition(int position) {
+        public DynamicGridKeyboard getKeyboardFromPagePosition(final int position) {
             final Pair<Integer, Integer> categoryAndId =
                     getCategoryIdAndPageIdFromPagePosition(position);
             if (categoryAndId != null) {
@@ -305,39 +305,41 @@
             return null;
         }
 
-        public DynamicGridKeyboard getKeyboard(int categoryId, int id) {
-            synchronized(mCategoryKeyboardMap) {
-                final long key = (((long) categoryId) << Constants.MAX_INT_BIT_COUNT) | id;
-                final DynamicGridKeyboard kbd;
-                if (!mCategoryKeyboardMap.containsKey(key)) {
-                    if (categoryId != CATEGORY_ID_RECENTS) {
-                        final Keyboard keyboard =
-                                mLayoutSet.getKeyboard(sCategoryElementId[categoryId]);
-                        final Key[][] sortedKeys = sortKeys(keyboard.getKeys(), mMaxPageKeyCount);
-                        for (int i = 0; i < sortedKeys.length; ++i) {
-                            final DynamicGridKeyboard tempKbd = new DynamicGridKeyboard(mPrefs,
-                                    mLayoutSet.getKeyboard(KeyboardId.ELEMENT_EMOJI_RECENTS),
-                                    mMaxPageKeyCount, categoryId, i /* categoryPageId */);
-                            for (Key emojiKey : sortedKeys[i]) {
-                                if (emojiKey == null) {
-                                    break;
-                                }
-                                tempKbd.addKeyLast(emojiKey);
-                            }
-                            mCategoryKeyboardMap.put((((long) categoryId)
-                                    << Constants.MAX_INT_BIT_COUNT) | i, tempKbd);
-                        }
-                        kbd = mCategoryKeyboardMap.get(key);
-                    } else {
-                        kbd = new DynamicGridKeyboard(mPrefs,
-                                mLayoutSet.getKeyboard(KeyboardId.ELEMENT_EMOJI_RECENTS),
-                                mMaxPageKeyCount, categoryId, 0 /* categoryPageId */);
-                        mCategoryKeyboardMap.put(key, kbd);
-                    }
-                } else {
-                    kbd = mCategoryKeyboardMap.get(key);
+        private static final Long getCategoryKeyboardMapKey(final int categoryId, final int id) {
+            return (((long) categoryId) << Constants.MAX_INT_BIT_COUNT) | id;
+        }
+
+        public DynamicGridKeyboard getKeyboard(final int categoryId, final int id) {
+            synchronized (mCategoryKeyboardMap) {
+                final Long categotyKeyboardMapKey = getCategoryKeyboardMapKey(categoryId, id);
+                if (mCategoryKeyboardMap.containsKey(categotyKeyboardMapKey)) {
+                    return mCategoryKeyboardMap.get(categotyKeyboardMapKey);
                 }
-                return kbd;
+
+                if (categoryId == CATEGORY_ID_RECENTS) {
+                    final DynamicGridKeyboard kbd = new DynamicGridKeyboard(mPrefs,
+                            mLayoutSet.getKeyboard(KeyboardId.ELEMENT_EMOJI_RECENTS),
+                            mMaxPageKeyCount, categoryId);
+                    mCategoryKeyboardMap.put(categotyKeyboardMapKey, kbd);
+                    return kbd;
+                }
+
+                final Keyboard keyboard = mLayoutSet.getKeyboard(sCategoryElementId[categoryId]);
+                final Key[][] sortedKeys = sortKeysIntoPages(keyboard.getKeys(), mMaxPageKeyCount);
+                for (int pageId = 0; pageId < sortedKeys.length; ++pageId) {
+                    final DynamicGridKeyboard tempKeyboard = new DynamicGridKeyboard(mPrefs,
+                            mLayoutSet.getKeyboard(KeyboardId.ELEMENT_EMOJI_RECENTS),
+                            mMaxPageKeyCount, categoryId);
+                    for (final Key emojiKey : sortedKeys[pageId]) {
+                        if (emojiKey == null) {
+                            break;
+                        }
+                        tempKeyboard.addKeyLast(emojiKey);
+                    }
+                    mCategoryKeyboardMap.put(
+                            getCategoryKeyboardMapKey(categoryId, pageId), tempKeyboard);
+                }
+                return mCategoryKeyboardMap.get(categotyKeyboardMapKey);
             }
         }
 
@@ -349,29 +351,31 @@
             return sum;
         }
 
-        private Key[][] sortKeys(Key[] inKeys, int maxPageCount) {
-            Key[] keys = Arrays.copyOf(inKeys, inKeys.length);
-            Arrays.sort(keys, 0, keys.length, new Comparator<Key>() {
-                @Override
-                public int compare(Key lhs, Key rhs) {
-                    final Rect lHitBox = lhs.getHitBox();
-                    final Rect rHitBox = rhs.getHitBox();
-                    if (lHitBox.top < rHitBox.top) {
-                        return -1;
-                    } else if (lHitBox.top > rHitBox.top) {
-                        return 1;
-                    }
-                    if (lHitBox.left < rHitBox.left) {
-                        return -1;
-                    } else if (lHitBox.left > rHitBox.left) {
-                        return 1;
-                    }
-                    if (lhs.getCode() == rhs.getCode()) {
-                        return 0;
-                    }
-                    return lhs.getCode() < rhs.getCode() ? -1 : 1;
+        private static Comparator<Key> EMOJI_KEY_COMPARATOR = new Comparator<Key>() {
+            @Override
+            public int compare(final Key lhs, final Key rhs) {
+                final Rect lHitBox = lhs.getHitBox();
+                final Rect rHitBox = rhs.getHitBox();
+                if (lHitBox.top < rHitBox.top) {
+                    return -1;
+                } else if (lHitBox.top > rHitBox.top) {
+                    return 1;
                 }
-            });
+                if (lHitBox.left < rHitBox.left) {
+                    return -1;
+                } else if (lHitBox.left > rHitBox.left) {
+                    return 1;
+                }
+                if (lhs.getCode() == rhs.getCode()) {
+                    return 0;
+                }
+                return lhs.getCode() < rhs.getCode() ? -1 : 1;
+            }
+        };
+
+        private static Key[][] sortKeysIntoPages(final Key[] inKeys, final int maxPageCount) {
+            final Key[] keys = Arrays.copyOf(inKeys, inKeys.length);
+            Arrays.sort(keys, 0, keys.length, EMOJI_KEY_COMPARATOR);
             final int pageCount = (keys.length - 1) / maxPageCount + 1;
             final Key[][] retval = new Key[pageCount][maxPageCount];
             for (int i = 0; i < keys.length; ++i) {
@@ -404,12 +408,12 @@
         final KeyboardLayoutSet.Builder builder = new KeyboardLayoutSet.Builder(
                 context, null /* editorInfo */);
         final Resources res = context.getResources();
-        final EmojiLayoutParams emojiLp = new EmojiLayoutParams(res);
+        mEmojiLayoutParams = new EmojiLayoutParams(res);
         builder.setSubtype(SubtypeSwitcher.getInstance().getEmojiSubtype());
         builder.setKeyboardGeometry(ResourceUtils.getDefaultKeyboardWidth(res),
-                emojiLp.mEmojiKeyboardHeight);
-        builder.setOptions(false, false, false /* lanuageSwitchKeyEnabled */);
-        mLayoutSet = builder.build();
+                mEmojiLayoutParams.mEmojiKeyboardHeight);
+        builder.setOptions(false /* shortcutImeEnabled */, false /* showsVoiceInputKey */,
+                false /* languageSwitchKeyEnabled */);
         mEmojiCategory = new EmojiCategory(PreferenceManager.getDefaultSharedPreferences(context),
                 context.getResources(), builder.build());
         mDeleteKeyOnTouchListener = new DeleteKeyOnTouchListener(context);
@@ -423,7 +427,7 @@
         final int width = ResourceUtils.getDefaultKeyboardWidth(res)
                 + getPaddingLeft() + getPaddingRight();
         final int height = ResourceUtils.getDefaultKeyboardHeight(res)
-                + res.getDimensionPixelSize(R.dimen.suggestions_strip_height)
+                + res.getDimensionPixelSize(R.dimen.config_suggestions_strip_height)
                 + getPaddingTop() + getPaddingBottom();
         setMeasuredDimension(width, height);
     }
@@ -458,25 +462,23 @@
         mTabHost.setOnTabChangedListener(this);
         mTabHost.getTabWidget().setStripEnabled(true);
 
-        mEmojiPalettesAdapter = new EmojiPalettesAdapter(mEmojiCategory, mLayoutSet, this);
+        mEmojiPalettesAdapter = new EmojiPalettesAdapter(mEmojiCategory, this);
 
         mEmojiPager = (ViewPager)findViewById(R.id.emoji_keyboard_pager);
         mEmojiPager.setAdapter(mEmojiPalettesAdapter);
         mEmojiPager.setOnPageChangeListener(this);
         mEmojiPager.setOffscreenPageLimit(0);
-        mEmojiPager.setPersistentDrawingCache(ViewPager.PERSISTENT_NO_CACHE);
-        final Resources res = getResources();
-        final EmojiLayoutParams emojiLp = new EmojiLayoutParams(res);
-        emojiLp.setPagerProperties(mEmojiPager);
+        mEmojiPager.setPersistentDrawingCache(PERSISTENT_NO_CACHE);
+        mEmojiLayoutParams.setPagerProperties(mEmojiPager);
 
         mEmojiCategoryPageIndicatorView =
                 (EmojiCategoryPageIndicatorView)findViewById(R.id.emoji_category_page_id_view);
-        emojiLp.setCategoryPageIdViewProperties(mEmojiCategoryPageIndicatorView);
+        mEmojiLayoutParams.setCategoryPageIdViewProperties(mEmojiCategoryPageIndicatorView);
 
         setCurrentCategoryId(mEmojiCategory.getCurrentCategoryId(), true /* force */);
 
         final LinearLayout actionBar = (LinearLayout)findViewById(R.id.emoji_action_bar);
-        emojiLp.setActionBarProperties(actionBar);
+        mEmojiLayoutParams.setActionBarProperties(actionBar);
 
         final ImageView deleteKey = (ImageView)findViewById(R.id.emoji_keyboard_delete);
         deleteKey.setTag(Constants.CODE_DELETE);
@@ -489,7 +491,7 @@
         spaceKey.setBackgroundResource(mKeyBackgroundId);
         spaceKey.setTag(Constants.CODE_SPACE);
         spaceKey.setOnClickListener(this);
-        emojiLp.setKeyProperties(spaceKey);
+        mEmojiLayoutParams.setKeyProperties(spaceKey);
         final ImageView alphabetKey2 = (ImageView)findViewById(R.id.emoji_keyboard_alphabet2);
         alphabetKey2.setBackgroundResource(mEmojiFunctionalKeyBackgroundId);
         alphabetKey2.setTag(Constants.CODE_SWITCH_ALPHA_SYMBOL);
@@ -628,16 +630,15 @@
     }
 
     private static class EmojiPalettesAdapter extends PagerAdapter {
-        private final ScrollKeyboardView.OnKeyClickListener mListener;
+        private final EmojiPageKeyboardView.OnKeyClickListener mListener;
         private final DynamicGridKeyboard mRecentsKeyboard;
-        private final SparseArray<ScrollKeyboardView> mActiveKeyboardViews =
+        private final SparseArray<EmojiPageKeyboardView> mActiveKeyboardViews =
                 CollectionUtils.newSparseArray();
         private final EmojiCategory mEmojiCategory;
         private int mActivePosition = 0;
 
         public EmojiPalettesAdapter(final EmojiCategory emojiCategory,
-                final KeyboardLayoutSet layoutSet,
-                final ScrollKeyboardView.OnKeyClickListener listener) {
+                final EmojiPageKeyboardView.OnKeyClickListener listener) {
             mEmojiCategory = emojiCategory;
             mListener = listener;
             mRecentsKeyboard = mEmojiCategory.getKeyboard(CATEGORY_ID_RECENTS, 0);
@@ -671,11 +672,12 @@
         }
 
         @Override
-        public void setPrimaryItem(final View container, final int position, final Object object) {
+        public void setPrimaryItem(final ViewGroup container, final int position,
+                final Object object) {
             if (mActivePosition == position) {
                 return;
             }
-            final ScrollKeyboardView oldKeyboardView = mActiveKeyboardViews.get(mActivePosition);
+            final EmojiPageKeyboardView oldKeyboardView = mActiveKeyboardViews.get(mActivePosition);
             if (oldKeyboardView != null) {
                 oldKeyboardView.releaseCurrentKey();
                 oldKeyboardView.deallocateMemory();
@@ -688,7 +690,7 @@
             if (DEBUG_PAGER) {
                 Log.d(TAG, "instantiate item: " + position);
             }
-            final ScrollKeyboardView oldKeyboardView = mActiveKeyboardViews.get(position);
+            final EmojiPageKeyboardView oldKeyboardView = mActiveKeyboardViews.get(position);
             if (oldKeyboardView != null) {
                 oldKeyboardView.deallocateMemory();
                 // This may be redundant but wanted to be safer..
@@ -697,18 +699,13 @@
             final Keyboard keyboard =
                     mEmojiCategory.getKeyboardFromPagePosition(position);
             final LayoutInflater inflater = LayoutInflater.from(container.getContext());
-            final View view = inflater.inflate(
+            final EmojiPageKeyboardView keyboardView = (EmojiPageKeyboardView)inflater.inflate(
                     R.layout.emoji_keyboard_page, container, false /* attachToRoot */);
-            final ScrollKeyboardView keyboardView = (ScrollKeyboardView)view.findViewById(
-                    R.id.emoji_keyboard_page);
             keyboardView.setKeyboard(keyboard);
             keyboardView.setOnKeyClickListener(mListener);
-            final ScrollViewWithNotifier scrollView = (ScrollViewWithNotifier)view.findViewById(
-                    R.id.emoji_keyboard_scroller);
-            keyboardView.setScrollView(scrollView);
-            container.addView(view);
+            container.addView(keyboardView);
             mActiveKeyboardViews.put(position, keyboardView);
-            return view;
+            return keyboardView;
         }
 
         @Override
@@ -722,7 +719,7 @@
             if (DEBUG_PAGER) {
                 Log.d(TAG, "destroy item: " + position + ", " + object.getClass().getSimpleName());
             }
-            final ScrollKeyboardView keyboardView = mActiveKeyboardViews.get(position);
+            final EmojiPageKeyboardView keyboardView = mActiveKeyboardViews.get(position);
             if (keyboardView != null) {
                 keyboardView.deallocateMemory();
                 mActiveKeyboardViews.remove(position);
@@ -795,7 +792,7 @@
             }
         }
 
-        public void pressDelete(int repeatCount) {
+        public void pressDelete(final int repeatCount) {
             mKeyboardActionListener.onPressKey(
                     Constants.CODE_DELETE, repeatCount, true /* isSinglePointer */);
             mKeyboardActionListener.onCodeInput(
@@ -804,22 +801,22 @@
                     Constants.CODE_DELETE, false /* withSliding */);
         }
 
-        public void setKeyboardActionListener(KeyboardActionListener listener) {
+        public void setKeyboardActionListener(final KeyboardActionListener listener) {
             mKeyboardActionListener = listener;
         }
 
         @Override
-        public boolean onTouch(View v, MotionEvent event) {
+        public boolean onTouch(final View v, final MotionEvent event) {
             switch(event.getAction()) {
-                case MotionEvent.ACTION_DOWN:
-                    v.setBackgroundColor(mDeleteKeyPressedBackgroundColor);
-                    pressDelete(0 /* repeatCount */);
-                    startRepeat();
-                    return true;
-                case MotionEvent.ACTION_UP:
-                    v.setBackgroundColor(0);
-                    abortRepeat();
-                    return true;
+            case MotionEvent.ACTION_DOWN:
+                v.setBackgroundColor(mDeleteKeyPressedBackgroundColor);
+                pressDelete(0 /* repeatCount */);
+                startRepeat();
+                return true;
+            case MotionEvent.ACTION_UP:
+                v.setBackgroundColor(0);
+                abortRepeat();
+                return true;
             }
             return false;
         }
diff --git a/java/src/com/android/inputmethod/keyboard/Key.java b/java/src/com/android/inputmethod/keyboard/Key.java
index f7ec950..c8c4d30 100644
--- a/java/src/com/android/inputmethod/keyboard/Key.java
+++ b/java/src/com/android/inputmethod/keyboard/Key.java
@@ -28,7 +28,6 @@
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
 import android.text.TextUtils;
-import android.util.Log;
 import android.util.Xml;
 
 import com.android.inputmethod.keyboard.internal.KeyDrawParams;
@@ -53,8 +52,6 @@
  * Class for describing the position and characteristics of a single key in the keyboard.
  */
 public class Key implements Comparable<Key> {
-    private static final String TAG = Key.class.getSimpleName();
-
     /**
      * The key code (unicode or custom code) that this key generates.
      */
@@ -84,10 +81,16 @@
     private static final int LABEL_FLAGS_HAS_HINT_LABEL = 0x800;
     private static final int LABEL_FLAGS_WITH_ICON_LEFT = 0x1000;
     private static final int LABEL_FLAGS_WITH_ICON_RIGHT = 0x2000;
+    // The bit to calculate the ratio of key label width against key width. If autoXScale bit is on
+    // and autoYScale bit is off, the key label may be shrunk only for X-direction.
+    // If both autoXScale and autoYScale bits are on, the key label text size may be auto scaled.
     private static final int LABEL_FLAGS_AUTO_X_SCALE = 0x4000;
-    private static final int LABEL_FLAGS_PRESERVE_CASE = 0x8000;
-    private static final int LABEL_FLAGS_SHIFTED_LETTER_ACTIVATED = 0x10000;
-    private static final int LABEL_FLAGS_FROM_CUSTOM_ACTION_LABEL = 0x20000;
+    private static final int LABEL_FLAGS_AUTO_Y_SCALE = 0x8000;
+    private static final int LABEL_FLAGS_AUTO_SCALE = LABEL_FLAGS_AUTO_X_SCALE
+            | LABEL_FLAGS_AUTO_Y_SCALE;
+    private static final int LABEL_FLAGS_PRESERVE_CASE = 0x10000;
+    private static final int LABEL_FLAGS_SHIFTED_LETTER_ACTIVATED = 0x20000;
+    private static final int LABEL_FLAGS_FROM_CUSTOM_ACTION_LABEL = 0x40000;
     private static final int LABEL_FLAGS_DISABLE_HINT_LABEL = 0x40000000;
     private static final int LABEL_FLAGS_DISABLE_ADDITIONAL_MORE_KEYS = 0x80000000;
 
@@ -345,8 +348,7 @@
             if (StringUtils.codePointCount(mLabel) == 1) {
                 // Use the first letter of the hint label if shiftedLetterActivated flag is
                 // specified.
-                if (hasShiftedLetterHint() && isShiftedLetterActivated()
-                        && !TextUtils.isEmpty(mHintLabel)) {
+                if (hasShiftedLetterHint() && isShiftedLetterActivated()) {
                     mCode = mHintLabel.codePointAt(0);
                 } else {
                     mCode = mLabel.codePointAt(0);
@@ -376,9 +378,6 @@
         mKeyVisualAttributes = KeyVisualAttributes.newInstance(keyAttr);
         keyAttr.recycle();
         mHashCode = computeHashCode(this);
-        if (hasShiftedLetterHint() && TextUtils.isEmpty(mHintLabel)) {
-            Log.w(TAG, "hasShiftedLetterHint specified without keyHintLabel: " + this);
-        }
     }
 
     /**
@@ -687,7 +686,8 @@
     }
 
     public final boolean hasShiftedLetterHint() {
-        return (mLabelFlags & LABEL_FLAGS_HAS_SHIFTED_LETTER_HINT) != 0;
+        return (mLabelFlags & LABEL_FLAGS_HAS_SHIFTED_LETTER_HINT) != 0
+                && !TextUtils.isEmpty(mHintLabel);
     }
 
     public final boolean hasHintLabel() {
@@ -702,12 +702,17 @@
         return (mLabelFlags & LABEL_FLAGS_WITH_ICON_RIGHT) != 0;
     }
 
-    public final boolean needsXScale() {
+    public final boolean needsAutoXScale() {
         return (mLabelFlags & LABEL_FLAGS_AUTO_X_SCALE) != 0;
     }
 
-    public final boolean isShiftedLetterActivated() {
-        return (mLabelFlags & LABEL_FLAGS_SHIFTED_LETTER_ACTIVATED) != 0;
+    public final boolean needsAutoScale() {
+        return (mLabelFlags & LABEL_FLAGS_AUTO_SCALE) == LABEL_FLAGS_AUTO_SCALE;
+    }
+
+    private final boolean isShiftedLetterActivated() {
+        return (mLabelFlags & LABEL_FLAGS_SHIFTED_LETTER_ACTIVATED) != 0
+                && !TextUtils.isEmpty(mHintLabel);
     }
 
     public final int getMoreKeysColumn() {
diff --git a/java/src/com/android/inputmethod/keyboard/KeyDetector.java b/java/src/com/android/inputmethod/keyboard/KeyDetector.java
index befb6fa..149f10f 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyDetector.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyDetector.java
@@ -81,7 +81,7 @@
         return mKeyboard;
     }
 
-    public boolean alwaysAllowsSlidingInput() {
+    public boolean alwaysAllowsKeySelectionByDraggingFinger() {
         return false;
     }
 
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardId.java b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
index 736f13e..02beb3f 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardId.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
@@ -70,8 +70,7 @@
     public final int mElementId;
     private final EditorInfo mEditorInfo;
     public final boolean mClobberSettingsKey;
-    public final boolean mShortcutKeyEnabled;
-    public final boolean mShortcutKeyOnSymbols;
+    public final boolean mSupportsSwitchingToShortcutIme;
     public final boolean mLanguageSwitchKeyEnabled;
     public final String mCustomActionLabel;
     public final boolean mHasShortcutKey;
@@ -87,17 +86,11 @@
         mElementId = elementId;
         mEditorInfo = params.mEditorInfo;
         mClobberSettingsKey = params.mNoSettingsKey;
-        mShortcutKeyEnabled = params.mVoiceKeyEnabled;
-        mShortcutKeyOnSymbols = mShortcutKeyEnabled && !params.mVoiceKeyOnMain;
+        mSupportsSwitchingToShortcutIme = params.mSupportsSwitchingToShortcutIme;
         mLanguageSwitchKeyEnabled = params.mLanguageSwitchKeyEnabled;
         mCustomActionLabel = (mEditorInfo.actionLabel != null)
                 ? mEditorInfo.actionLabel.toString() : null;
-        final boolean alphabetMayHaveShortcutKey = isAlphabetKeyboard(elementId)
-                && !mShortcutKeyOnSymbols;
-        final boolean symbolsMayHaveShortcutKey = (elementId == KeyboardId.ELEMENT_SYMBOLS)
-                && mShortcutKeyOnSymbols;
-        mHasShortcutKey = mShortcutKeyEnabled
-                && (alphabetMayHaveShortcutKey || symbolsMayHaveShortcutKey);
+        mHasShortcutKey = mSupportsSwitchingToShortcutIme && params.mShowsVoiceInputKey;
 
         mHashCode = computeHashCode(this);
     }
@@ -110,8 +103,8 @@
                 id.mHeight,
                 id.passwordInput(),
                 id.mClobberSettingsKey,
-                id.mShortcutKeyEnabled,
-                id.mShortcutKeyOnSymbols,
+                id.mSupportsSwitchingToShortcutIme,
+                id.mHasShortcutKey,
                 id.mLanguageSwitchKeyEnabled,
                 id.isMultiLine(),
                 id.imeAction(),
@@ -131,8 +124,8 @@
                 && other.mHeight == mHeight
                 && other.passwordInput() == passwordInput()
                 && other.mClobberSettingsKey == mClobberSettingsKey
-                && other.mShortcutKeyEnabled == mShortcutKeyEnabled
-                && other.mShortcutKeyOnSymbols == mShortcutKeyOnSymbols
+                && other.mSupportsSwitchingToShortcutIme == mSupportsSwitchingToShortcutIme
+                && other.mHasShortcutKey == mHasShortcutKey
                 && other.mLanguageSwitchKeyEnabled == mLanguageSwitchKeyEnabled
                 && other.isMultiLine() == isMultiLine()
                 && other.imeAction() == imeAction()
@@ -186,21 +179,20 @@
 
     @Override
     public String toString() {
-        return String.format(Locale.ROOT, "[%s %s:%s %dx%d %s %s %s%s%s%s%s%s%s%s%s]",
+        return String.format(Locale.ROOT, "[%s %s:%s %dx%d %s %s%s%s%s%s%s%s%s%s]",
                 elementIdToName(mElementId),
                 mLocale, mSubtype.getExtraValueOf(KEYBOARD_LAYOUT_SET),
                 mWidth, mHeight,
                 modeName(mMode),
-                imeAction(),
-                (navigateNext() ? "navigateNext" : ""),
-                (navigatePrevious() ? "navigatePrevious" : ""),
+                actionName(imeAction()),
+                (navigateNext() ? " navigateNext" : ""),
+                (navigatePrevious() ? " navigatePrevious" : ""),
                 (mClobberSettingsKey ? " clobberSettingsKey" : ""),
                 (passwordInput() ? " passwordInput" : ""),
-                (mShortcutKeyEnabled ? " shortcutKeyEnabled" : ""),
-                (mShortcutKeyOnSymbols ? " shortcutKeyOnSymbols" : ""),
+                (mSupportsSwitchingToShortcutIme ? " supportsSwitchingToShortcutIme" : ""),
                 (mHasShortcutKey ? " hasShortcutKey" : ""),
                 (mLanguageSwitchKeyEnabled ? " languageSwitchKeyEnabled" : ""),
-                (isMultiLine() ? "isMultiLine" : "")
+                (isMultiLine() ? " isMultiLine" : "")
         );
     }
 
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
index 1eccdf3..e5b814f 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
@@ -105,10 +105,10 @@
         int mMode;
         EditorInfo mEditorInfo;
         boolean mDisableTouchPositionCorrectionDataForTest;
-        boolean mVoiceKeyEnabled;
-        // TODO: Remove mVoiceKeyOnMain when it's certainly confirmed that we no longer show
-        // the voice input key on the symbol layout
-        boolean mVoiceKeyOnMain;
+        boolean mIsPasswordField;
+        boolean mSupportsSwitchingToShortcutIme;
+        boolean mShowsVoiceInputKey;
+        boolean mNoMicrophoneKey;
         boolean mNoSettingsKey;
         boolean mLanguageSwitchKeyEnabled;
         InputMethodSubtype mSubtype;
@@ -221,16 +221,24 @@
 
         private static final EditorInfo EMPTY_EDITOR_INFO = new EditorInfo();
 
-        public Builder(final Context context, final EditorInfo editorInfo) {
+        public Builder(final Context context, final EditorInfo ei) {
             mContext = context;
             mPackageName = context.getPackageName();
             mResources = context.getResources();
             final Params params = mParams;
 
+            final EditorInfo editorInfo = (ei != null) ? ei : EMPTY_EDITOR_INFO;
             params.mMode = getKeyboardMode(editorInfo);
-            params.mEditorInfo = (editorInfo != null) ? editorInfo : EMPTY_EDITOR_INFO;
+            params.mEditorInfo = editorInfo;
+            params.mIsPasswordField = InputTypeUtils.isPasswordInputType(editorInfo.inputType);
+            @SuppressWarnings("deprecation")
+            final boolean deprecatedNoMicrophone = InputAttributes.inPrivateImeOptions(
+                    null, NO_MICROPHONE_COMPAT, editorInfo);
+            params.mNoMicrophoneKey = InputAttributes.inPrivateImeOptions(
+                    mPackageName, NO_MICROPHONE, editorInfo)
+                    || deprecatedNoMicrophone;
             params.mNoSettingsKey = InputAttributes.inPrivateImeOptions(
-                    mPackageName, NO_SETTINGS_KEY, params.mEditorInfo);
+                    mPackageName, NO_SETTINGS_KEY, editorInfo);
         }
 
         public Builder setKeyboardGeometry(final int keyboardWidth, final int keyboardHeight) {
@@ -261,18 +269,11 @@
             return this;
         }
 
-        // TODO: Remove mVoiceKeyOnMain when it's certainly confirmed that we no longer show
-        // the voice input key on the symbol layout
-        public Builder setOptions(final boolean voiceKeyEnabled, final boolean voiceKeyOnMain,
-                final boolean languageSwitchKeyEnabled) {
-            @SuppressWarnings("deprecation")
-            final boolean deprecatedNoMicrophone = InputAttributes.inPrivateImeOptions(
-                    null, NO_MICROPHONE_COMPAT, mParams.mEditorInfo);
-            final boolean noMicrophone = InputAttributes.inPrivateImeOptions(
-                    mPackageName, NO_MICROPHONE, mParams.mEditorInfo)
-                    || deprecatedNoMicrophone;
-            mParams.mVoiceKeyEnabled = voiceKeyEnabled && !noMicrophone;
-            mParams.mVoiceKeyOnMain = voiceKeyOnMain;
+        public Builder setOptions(final boolean isShortcutImeEnabled,
+                final boolean showsVoiceInputKey, final boolean languageSwitchKeyEnabled) {
+            mParams.mSupportsSwitchingToShortcutIme =
+                    isShortcutImeEnabled && !mParams.mNoMicrophoneKey && !mParams.mIsPasswordField;
+            mParams.mShowsVoiceInputKey = showsVoiceInputKey;
             mParams.mLanguageSwitchKeyEnabled = languageSwitchKeyEnabled;
             return this;
         }
@@ -368,9 +369,6 @@
         }
 
         private static int getKeyboardMode(final EditorInfo editorInfo) {
-            if (editorInfo == null)
-                return KeyboardId.MODE_TEXT;
-
             final int inputType = editorInfo.inputType;
             final int variation = inputType & InputType.TYPE_MASK_VARIATION;
 
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
index 5abc9ab..53b4485 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -154,8 +154,8 @@
         builder.setKeyboardGeometry(keyboardWidth, keyboardHeight);
         builder.setSubtype(mSubtypeSwitcher.getCurrentSubtype());
         builder.setOptions(
-                settingsValues.isVoiceKeyEnabled(editorInfo),
-                true /* always show a voice key on the main keyboard */,
+                mSubtypeSwitcher.isShortcutImeEnabled(),
+                settingsValues.mShowsVoiceInputKey,
                 settingsValues.isLanguageSwitchKeyEnabled());
         mKeyboardLayoutSet = builder.build();
         try {
@@ -187,7 +187,7 @@
         final MainKeyboardView keyboardView = mKeyboardView;
         final Keyboard oldKeyboard = keyboardView.getKeyboard();
         keyboardView.setKeyboard(keyboard);
-        mCurrentInputView.setKeyboardGeometry(keyboard.mTopPadding);
+        mCurrentInputView.setKeyboardTopPadding(keyboard.mTopPadding);
         keyboardView.setKeyPreviewPopupEnabled(
                 Settings.readKeyPreviewPopupEnabled(mPrefs, mResources),
                 Settings.readKeyPreviewPopupDismissDelay(mPrefs, mResources));
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardView.java b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
index 5578713..422bd12 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardView.java
@@ -113,9 +113,6 @@
     private final Canvas mOffscreenCanvas = new Canvas();
     private final Paint mPaint = new Paint();
     private final Paint.FontMetrics mFontMetrics = new Paint.FontMetrics();
-    private static final char[] KEY_LABEL_REFERENCE_CHAR = { 'M' };
-    private static final char[] KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR = { '8' };
-
     public KeyboardView(final Context context, final AttributeSet attrs) {
         this(context, attrs, R.attr.keyboardViewStyle);
     }
@@ -322,7 +319,7 @@
         params.mAnimAlpha = Constants.Color.ALPHA_OPAQUE;
 
         if (!key.isSpacer()) {
-            onDrawKeyBackground(key, canvas);
+            onDrawKeyBackground(key, canvas, mKeyBackground);
         }
         onDrawKeyTopVisuals(key, canvas, paint, params);
 
@@ -330,14 +327,14 @@
     }
 
     // Draw key background.
-    protected void onDrawKeyBackground(final Key key, final Canvas canvas) {
+    protected void onDrawKeyBackground(final Key key, final Canvas canvas,
+            final Drawable background) {
         final Rect padding = mKeyBackgroundPadding;
         final int bgWidth = key.getDrawWidth() + padding.left + padding.right;
         final int bgHeight = key.getHeight() + padding.top + padding.bottom;
         final int bgX = -padding.left;
         final int bgY = -padding.top;
         final int[] drawableState = key.getCurrentDrawableState();
-        final Drawable background = mKeyBackground;
         background.setState(drawableState);
         final Rect bounds = background.getBounds();
         if (bgWidth != bounds.right || bgHeight != bounds.bottom) {
@@ -370,10 +367,8 @@
         if (label != null) {
             paint.setTypeface(key.selectTypeface(params));
             paint.setTextSize(key.selectTextSize(params));
-            final float labelCharHeight = TypefaceUtils.getCharHeight(
-                    KEY_LABEL_REFERENCE_CHAR, paint);
-            final float labelCharWidth = TypefaceUtils.getCharWidth(
-                    KEY_LABEL_REFERENCE_CHAR, paint);
+            final float labelCharHeight = TypefaceUtils.getReferenceCharHeight(paint);
+            final float labelCharWidth = TypefaceUtils.getReferenceCharWidth(paint);
 
             // Vertical label text alignment.
             final float baseline = centerY + labelCharHeight / 2.0f;
@@ -391,12 +386,12 @@
                 positionX = centerX - labelCharWidth * 7.0f / 4.0f;
                 paint.setTextAlign(Align.LEFT);
             } else if (key.hasLabelWithIconLeft() && icon != null) {
-                labelWidth = TypefaceUtils.getLabelWidth(label, paint) + icon.getIntrinsicWidth()
+                labelWidth = TypefaceUtils.getStringWidth(label, paint) + icon.getIntrinsicWidth()
                         + LABEL_ICON_MARGIN * keyWidth;
                 positionX = centerX + labelWidth / 2.0f;
                 paint.setTextAlign(Align.RIGHT);
             } else if (key.hasLabelWithIconRight() && icon != null) {
-                labelWidth = TypefaceUtils.getLabelWidth(label, paint) + icon.getIntrinsicWidth()
+                labelWidth = TypefaceUtils.getStringWidth(label, paint) + icon.getIntrinsicWidth()
                         + LABEL_ICON_MARGIN * keyWidth;
                 positionX = centerX - labelWidth / 2.0f;
                 paint.setTextAlign(Align.LEFT);
@@ -404,9 +399,15 @@
                 positionX = centerX;
                 paint.setTextAlign(Align.CENTER);
             }
-            if (key.needsXScale()) {
-                paint.setTextScaleX(Math.min(1.0f,
-                        (keyWidth * MAX_LABEL_RATIO) / TypefaceUtils.getLabelWidth(label, paint)));
+            if (key.needsAutoXScale()) {
+                final float ratio = Math.min(1.0f, (keyWidth * MAX_LABEL_RATIO) /
+                        TypefaceUtils.getStringWidth(label, paint));
+                if (key.needsAutoScale()) {
+                    final float autoSize = paint.getTextSize() * ratio;
+                    paint.setTextSize(autoSize);
+                } else {
+                    paint.setTextScaleX(ratio);
+                }
             }
 
             paint.setColor(key.selectTextColor(params));
@@ -451,36 +452,35 @@
             // TODO: Should add a way to specify type face for hint letters
             paint.setTypeface(Typeface.DEFAULT_BOLD);
             blendAlpha(paint, params.mAnimAlpha);
+            final float labelCharHeight = TypefaceUtils.getReferenceCharHeight(paint);
+            final float labelCharWidth = TypefaceUtils.getReferenceCharWidth(paint);
+            final KeyVisualAttributes visualAttr = key.getVisualAttributes();
+            final float adjustmentY = (visualAttr == null) ? 0.0f
+                    : visualAttr.mHintLabelVerticalAdjustment * labelCharHeight;
             final float hintX, hintY;
             if (key.hasHintLabel()) {
                 // The hint label is placed just right of the key label. Used mainly on
                 // "phone number" layout.
                 // TODO: Generalize the following calculations.
-                hintX = positionX
-                        + TypefaceUtils.getCharWidth(KEY_LABEL_REFERENCE_CHAR, paint) * 2.0f;
-                hintY = centerY
-                        + TypefaceUtils.getCharHeight(KEY_LABEL_REFERENCE_CHAR, paint) / 2.0f;
+                hintX = positionX + labelCharWidth * 2.0f;
+                hintY = centerY + labelCharHeight / 2.0f;
                 paint.setTextAlign(Align.LEFT);
             } else if (key.hasShiftedLetterHint()) {
                 // The hint label is placed at top-right corner of the key. Used mainly on tablet.
-                hintX = keyWidth - mKeyShiftedLetterHintPadding
-                        - TypefaceUtils.getCharWidth(KEY_LABEL_REFERENCE_CHAR, paint) / 2.0f;
+                hintX = keyWidth - mKeyShiftedLetterHintPadding - labelCharWidth / 2.0f;
                 paint.getFontMetrics(mFontMetrics);
                 hintY = -mFontMetrics.top;
                 paint.setTextAlign(Align.CENTER);
             } else { // key.hasHintLetter()
                 // The hint letter is placed at top-right corner of the key. Used mainly on phone.
-                final float keyNumericHintLabelReferenceCharWidth =
-                        TypefaceUtils.getCharWidth(KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR, paint);
-                final float keyHintLabelStringWidth =
-                        TypefaceUtils.getStringWidth(hintLabel, paint);
+                final float hintDigitWidth = TypefaceUtils.getReferenceDigitWidth(paint);
+                final float hintLabelWidth = TypefaceUtils.getStringWidth(hintLabel, paint);
                 hintX = keyWidth - mKeyHintLetterPadding
-                        - Math.max(keyNumericHintLabelReferenceCharWidth, keyHintLabelStringWidth)
-                                / 2.0f;
+                        - Math.max(hintDigitWidth, hintLabelWidth) / 2.0f;
                 hintY = -paint.ascent();
                 paint.setTextAlign(Align.CENTER);
             }
-            canvas.drawText(hintLabel, 0, hintLabel.length(), hintX, hintY, paint);
+            canvas.drawText(hintLabel, 0, hintLabel.length(), hintX, hintY + adjustmentY, paint);
 
             if (LatinImeLogger.sVISUALDEBUG) {
                 final Paint line = new Paint();
@@ -530,7 +530,7 @@
         paint.setColor(params.mHintLabelColor);
         paint.setTextAlign(Align.CENTER);
         final float hintX = keyWidth - mKeyHintLetterPadding
-                - TypefaceUtils.getCharWidth(KEY_LABEL_REFERENCE_CHAR, paint) / 2.0f;
+                - TypefaceUtils.getReferenceCharWidth(paint) / 2.0f;
         final float hintY = keyHeight - mKeyPopupHintLetterPadding;
         canvas.drawText(POPUP_HINT_CHAR, hintX, hintY, paint);
 
diff --git a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
index 13db470..e1c841d 100644
--- a/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/MainKeyboardView.java
@@ -16,7 +16,10 @@
 
 package com.android.inputmethod.keyboard;
 
+import android.animation.Animator;
 import android.animation.AnimatorInflater;
+import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.content.Context;
 import android.content.SharedPreferences;
@@ -28,34 +31,32 @@
 import android.graphics.Paint.Align;
 import android.graphics.Typeface;
 import android.graphics.drawable.Drawable;
-import android.os.Message;
-import android.os.SystemClock;
 import android.preference.PreferenceManager;
 import android.util.AttributeSet;
 import android.util.DisplayMetrics;
 import android.util.Log;
-import android.util.SparseArray;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
-import android.view.ViewConfiguration;
 import android.view.ViewGroup;
+import android.view.animation.AccelerateInterpolator;
+import android.view.animation.DecelerateInterpolator;
 import android.view.inputmethod.InputMethodSubtype;
 import android.widget.TextView;
 
 import com.android.inputmethod.accessibility.AccessibilityUtils;
 import com.android.inputmethod.accessibility.AccessibleKeyboardViewProxy;
 import com.android.inputmethod.annotations.ExternallyReferenced;
-import com.android.inputmethod.keyboard.PointerTracker.DrawingProxy;
-import com.android.inputmethod.keyboard.PointerTracker.TimerProxy;
-import com.android.inputmethod.keyboard.internal.GestureFloatingPreviewText;
-import com.android.inputmethod.keyboard.internal.GestureTrailsPreview;
+import com.android.inputmethod.keyboard.internal.DrawingHandler;
+import com.android.inputmethod.keyboard.internal.DrawingPreviewPlacerView;
+import com.android.inputmethod.keyboard.internal.GestureFloatingTextDrawingPreview;
+import com.android.inputmethod.keyboard.internal.GestureTrailsDrawingPreview;
 import com.android.inputmethod.keyboard.internal.KeyDrawParams;
 import com.android.inputmethod.keyboard.internal.KeyPreviewDrawParams;
 import com.android.inputmethod.keyboard.internal.NonDistinctMultitouchHelper;
-import com.android.inputmethod.keyboard.internal.PreviewPlacerView;
-import com.android.inputmethod.keyboard.internal.SlidingKeyInputPreview;
+import com.android.inputmethod.keyboard.internal.SlidingKeyInputDrawingPreview;
+import com.android.inputmethod.keyboard.internal.TimerHandler;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.R;
@@ -64,13 +65,15 @@
 import com.android.inputmethod.latin.settings.DebugSettings;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.CoordinateUtils;
-import com.android.inputmethod.latin.utils.StaticInnerHandlerWrapper;
 import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
 import com.android.inputmethod.latin.utils.TypefaceUtils;
 import com.android.inputmethod.latin.utils.UsabilityStudyLogUtils;
 import com.android.inputmethod.latin.utils.ViewLayoutUtils;
 import com.android.inputmethod.research.ResearchLogger;
 
+import java.util.ArrayDeque;
+import java.util.HashMap;
+import java.util.HashSet;
 import java.util.WeakHashMap;
 
 /**
@@ -78,9 +81,10 @@
  *
  * @attr ref R.styleable#MainKeyboardView_autoCorrectionSpacebarLedEnabled
  * @attr ref R.styleable#MainKeyboardView_autoCorrectionSpacebarLedIcon
- * @attr ref R.styleable#MainKeyboardView_spacebarTextRatio
- * @attr ref R.styleable#MainKeyboardView_spacebarTextColor
- * @attr ref R.styleable#MainKeyboardView_spacebarTextShadowColor
+ * @attr ref R.styleable#MainKeyboardView_languageOnSpacebarTextRatio
+ * @attr ref R.styleable#MainKeyboardView_languageOnSpacebarTextColor
+ * @attr ref R.styleable#MainKeyboardView_languageOnSpacebarTextShadowColor
+ * @attr ref R.styleable#MainKeyboardView_spacebarBackground
  * @attr ref R.styleable#MainKeyboardView_languageOnSpacebarFinalAlpha
  * @attr ref R.styleable#MainKeyboardView_languageOnSpacebarFadeoutAnimator
  * @attr ref R.styleable#MainKeyboardView_altCodeKeyWhileTypingFadeoutAnimator
@@ -88,7 +92,7 @@
  * @attr ref R.styleable#MainKeyboardView_keyHysteresisDistance
  * @attr ref R.styleable#MainKeyboardView_touchNoiseThresholdTime
  * @attr ref R.styleable#MainKeyboardView_touchNoiseThresholdDistance
- * @attr ref R.styleable#MainKeyboardView_slidingKeyInputEnable
+ * @attr ref R.styleable#MainKeyboardView_keySelectionByDraggingFinger
  * @attr ref R.styleable#MainKeyboardView_keyRepeatStartTimeout
  * @attr ref R.styleable#MainKeyboardView_keyRepeatInterval
  * @attr ref R.styleable#MainKeyboardView_longPressKeyTimeout
@@ -114,26 +118,27 @@
  * @attr ref R.styleable#MainKeyboardView_gestureRecognitionSpeedThreshold
  * @attr ref R.styleable#MainKeyboardView_suppressKeyPreviewAfterBatchInputDuration
  */
-public final class MainKeyboardView extends KeyboardView implements PointerTracker.KeyEventHandler,
-        PointerTracker.DrawingProxy, MoreKeysPanel.Controller {
+public final class MainKeyboardView extends KeyboardView implements PointerTracker.DrawingProxy,
+        MoreKeysPanel.Controller, DrawingHandler.Callbacks, TimerHandler.Callbacks {
     private static final String TAG = MainKeyboardView.class.getSimpleName();
 
     /** Listener for {@link KeyboardActionListener}. */
     private KeyboardActionListener mKeyboardActionListener;
 
-    /* Space key and its icons */
+    /* Space key and its icon and background. */
     private Key mSpaceKey;
-    private Drawable mSpaceIcon;
+    private Drawable mSpacebarIcon;
+    private final Drawable mSpacebarBackground;
     // Stuff to draw language name on spacebar.
     private final int mLanguageOnSpacebarFinalAlpha;
     private ObjectAnimator mLanguageOnSpacebarFadeoutAnimator;
     private boolean mNeedsToDisplayLanguage;
     private boolean mHasMultipleEnabledIMEsOrSubtypes;
     private int mLanguageOnSpacebarAnimAlpha = Constants.Color.ALPHA_OPAQUE;
-    private final float mSpacebarTextRatio;
-    private float mSpacebarTextSize;
-    private final int mSpacebarTextColor;
-    private final int mSpacebarTextShadowColor;
+    private final float mLanguageOnSpacebarTextRatio;
+    private float mLanguageOnSpacebarTextSize;
+    private final int mLanguageOnSpacebarTextColor;
+    private final int mLanguageOnSpacebarTextShadowColor;
     // The minimum x-scale to fit the language name on spacebar.
     private static final float MINIMUM_XSCALE_OF_LANGUAGE_NAME = 0.8f;
     // Stuff to draw auto correction LED on spacebar.
@@ -143,25 +148,38 @@
     private static final int SPACE_LED_LENGTH_PERCENT = 80;
 
     // Stuff to draw altCodeWhileTyping keys.
-    private ObjectAnimator mAltCodeKeyWhileTypingFadeoutAnimator;
-    private ObjectAnimator mAltCodeKeyWhileTypingFadeinAnimator;
+    private final ObjectAnimator mAltCodeKeyWhileTypingFadeoutAnimator;
+    private final ObjectAnimator mAltCodeKeyWhileTypingFadeinAnimator;
     private int mAltCodeKeyWhileTypingAnimAlpha = Constants.Color.ALPHA_OPAQUE;
 
-    // Preview placer view
-    private final PreviewPlacerView mPreviewPlacerView;
+    // Drawing preview placer view
+    private final DrawingPreviewPlacerView mDrawingPreviewPlacerView;
     private final int[] mOriginCoords = CoordinateUtils.newInstance();
-    private final GestureFloatingPreviewText mGestureFloatingPreviewText;
-    private final GestureTrailsPreview mGestureTrailsPreview;
-    private final SlidingKeyInputPreview mSlidingKeyInputPreview;
+    private final GestureFloatingTextDrawingPreview mGestureFloatingTextDrawingPreview;
+    private final GestureTrailsDrawingPreview mGestureTrailsDrawingPreview;
+    private final SlidingKeyInputDrawingPreview mSlidingKeyInputDrawingPreview;
 
     // Key preview
+    private static final boolean FADE_OUT_KEY_TOP_LETTER_WHEN_KEY_IS_PRESSED = false;
     private final int mKeyPreviewLayoutId;
     private final int mKeyPreviewOffset;
     private final int mKeyPreviewHeight;
-    private final SparseArray<TextView> mKeyPreviewTexts = CollectionUtils.newSparseArray();
+    // Free {@link TextView} pool that can be used for key preview.
+    private final ArrayDeque<TextView> mFreeKeyPreviewTextViews = CollectionUtils.newArrayDeque();
+    // Map from {@link Key} to {@link TextView} that is currently being displayed as key preview.
+    private final HashMap<Key,TextView> mShowingKeyPreviewTextViews = CollectionUtils.newHashMap();
     private final KeyPreviewDrawParams mKeyPreviewDrawParams = new KeyPreviewDrawParams();
     private boolean mShowKeyPreviewPopup = true;
     private int mKeyPreviewLingerTimeout;
+    private int mKeyPreviewZoomInDuration;
+    private int mKeyPreviewZoomOutDuration;
+    private static final float KEY_PREVIEW_START_ZOOM_IN_SCALE = 0.7f;
+    private static final float KEY_PREVIEW_END_ZOOM_IN_SCALE = 1.0f;
+    private static final float KEY_PREVIEW_END_ZOOM_OUT_SCALE = 0.7f;
+    private static final AccelerateInterpolator ACCELERATE_INTERPOLATOR =
+            new AccelerateInterpolator();
+    private static final DecelerateInterpolator DECELERATE_INTERPOLATOR =
+            new DecelerateInterpolator();
 
     // More keys keyboard
     private final Paint mBackgroundDimAlphaPaint = new Paint();
@@ -178,244 +196,14 @@
     // TODO: Make this parameter customizable by user via settings.
     private int mGestureFloatingPreviewTextLingerTimeout;
 
-    private KeyDetector mKeyDetector;
+    private final KeyDetector mKeyDetector;
     private final NonDistinctMultitouchHelper mNonDistinctMultitouchHelper;
 
-    private final KeyTimerHandler mKeyTimerHandler;
+    private final TimerHandler mKeyTimerHandler;
     private final int mLanguageOnSpacebarHorizontalMargin;
 
-    private static final class KeyTimerHandler extends StaticInnerHandlerWrapper<MainKeyboardView>
-            implements TimerProxy {
-        private static final int MSG_TYPING_STATE_EXPIRED = 0;
-        private static final int MSG_REPEAT_KEY = 1;
-        private static final int MSG_LONGPRESS_KEY = 2;
-        private static final int MSG_DOUBLE_TAP_SHIFT_KEY = 3;
-        private static final int MSG_UPDATE_BATCH_INPUT = 4;
-
-        private final int mIgnoreAltCodeKeyTimeout;
-        private final int mGestureRecognitionUpdateTime;
-
-        public KeyTimerHandler(final MainKeyboardView outerInstance,
-                final TypedArray mainKeyboardViewAttr) {
-            super(outerInstance);
-
-            mIgnoreAltCodeKeyTimeout = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_ignoreAltCodeKeyTimeout, 0);
-            mGestureRecognitionUpdateTime = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureRecognitionUpdateTime, 0);
-        }
-
-        @Override
-        public void handleMessage(final Message msg) {
-            final MainKeyboardView keyboardView = getOuterInstance();
-            if (keyboardView == null) {
-                return;
-            }
-            final PointerTracker tracker = (PointerTracker) msg.obj;
-            switch (msg.what) {
-            case MSG_TYPING_STATE_EXPIRED:
-                startWhileTypingFadeinAnimation(keyboardView);
-                break;
-            case MSG_REPEAT_KEY:
-                tracker.onKeyRepeat(msg.arg1 /* code */, msg.arg2 /* repeatCount */);
-                break;
-            case MSG_LONGPRESS_KEY:
-                keyboardView.onLongPress(tracker);
-                break;
-            case MSG_UPDATE_BATCH_INPUT:
-                tracker.updateBatchInputByTimer(SystemClock.uptimeMillis());
-                startUpdateBatchInputTimer(tracker);
-                break;
-            }
-        }
-
-        @Override
-        public void startKeyRepeatTimer(final PointerTracker tracker, final int repeatCount,
-                final int delay) {
-            final Key key = tracker.getKey();
-            if (key == null || delay == 0) {
-                return;
-            }
-            sendMessageDelayed(
-                    obtainMessage(MSG_REPEAT_KEY, key.getCode(), repeatCount, tracker), delay);
-        }
-
-        public void cancelKeyRepeatTimer() {
-            removeMessages(MSG_REPEAT_KEY);
-        }
-
-        // TODO: Suppress layout changes in key repeat mode
-        public boolean isInKeyRepeat() {
-            return hasMessages(MSG_REPEAT_KEY);
-        }
-
-        @Override
-        public void startLongPressTimer(final PointerTracker tracker, final int delay) {
-            cancelLongPressTimer();
-            if (delay <= 0) return;
-            sendMessageDelayed(obtainMessage(MSG_LONGPRESS_KEY, tracker), delay);
-        }
-
-        @Override
-        public void cancelLongPressTimer() {
-            removeMessages(MSG_LONGPRESS_KEY);
-        }
-
-        private static void cancelAndStartAnimators(final ObjectAnimator animatorToCancel,
-                final ObjectAnimator animatorToStart) {
-            if (animatorToCancel == null || animatorToStart == null) {
-                // TODO: Stop using null as a no-operation animator.
-                return;
-            }
-            float startFraction = 0.0f;
-            if (animatorToCancel.isStarted()) {
-                animatorToCancel.cancel();
-                startFraction = 1.0f - animatorToCancel.getAnimatedFraction();
-            }
-            final long startTime = (long)(animatorToStart.getDuration() * startFraction);
-            animatorToStart.start();
-            animatorToStart.setCurrentPlayTime(startTime);
-        }
-
-        private static void startWhileTypingFadeinAnimation(final MainKeyboardView keyboardView) {
-            cancelAndStartAnimators(keyboardView.mAltCodeKeyWhileTypingFadeoutAnimator,
-                    keyboardView.mAltCodeKeyWhileTypingFadeinAnimator);
-        }
-
-        private static void startWhileTypingFadeoutAnimation(final MainKeyboardView keyboardView) {
-            cancelAndStartAnimators(keyboardView.mAltCodeKeyWhileTypingFadeinAnimator,
-                    keyboardView.mAltCodeKeyWhileTypingFadeoutAnimator);
-        }
-
-        @Override
-        public void startTypingStateTimer(final Key typedKey) {
-            if (typedKey.isModifier() || typedKey.altCodeWhileTyping()) {
-                return;
-            }
-
-            final boolean isTyping = isTypingState();
-            removeMessages(MSG_TYPING_STATE_EXPIRED);
-            final MainKeyboardView keyboardView = getOuterInstance();
-
-            // When user hits the space or the enter key, just cancel the while-typing timer.
-            final int typedCode = typedKey.getCode();
-            if (typedCode == Constants.CODE_SPACE || typedCode == Constants.CODE_ENTER) {
-                if (isTyping) {
-                    startWhileTypingFadeinAnimation(keyboardView);
-                }
-                return;
-            }
-
-            sendMessageDelayed(
-                    obtainMessage(MSG_TYPING_STATE_EXPIRED), mIgnoreAltCodeKeyTimeout);
-            if (isTyping) {
-                return;
-            }
-            startWhileTypingFadeoutAnimation(keyboardView);
-        }
-
-        @Override
-        public boolean isTypingState() {
-            return hasMessages(MSG_TYPING_STATE_EXPIRED);
-        }
-
-        @Override
-        public void startDoubleTapShiftKeyTimer() {
-            sendMessageDelayed(obtainMessage(MSG_DOUBLE_TAP_SHIFT_KEY),
-                    ViewConfiguration.getDoubleTapTimeout());
-        }
-
-        @Override
-        public void cancelDoubleTapShiftKeyTimer() {
-            removeMessages(MSG_DOUBLE_TAP_SHIFT_KEY);
-        }
-
-        @Override
-        public boolean isInDoubleTapShiftKeyTimeout() {
-            return hasMessages(MSG_DOUBLE_TAP_SHIFT_KEY);
-        }
-
-        @Override
-        public void cancelKeyTimers() {
-            cancelKeyRepeatTimer();
-            cancelLongPressTimer();
-        }
-
-        @Override
-        public void startUpdateBatchInputTimer(final PointerTracker tracker) {
-            if (mGestureRecognitionUpdateTime <= 0) {
-                return;
-            }
-            removeMessages(MSG_UPDATE_BATCH_INPUT, tracker);
-            sendMessageDelayed(obtainMessage(MSG_UPDATE_BATCH_INPUT, tracker),
-                    mGestureRecognitionUpdateTime);
-        }
-
-        @Override
-        public void cancelUpdateBatchInputTimer(final PointerTracker tracker) {
-            removeMessages(MSG_UPDATE_BATCH_INPUT, tracker);
-        }
-
-        @Override
-        public void cancelAllUpdateBatchInputTimers() {
-            removeMessages(MSG_UPDATE_BATCH_INPUT);
-        }
-
-        public void cancelAllMessages() {
-            cancelKeyTimers();
-            cancelAllUpdateBatchInputTimers();
-        }
-    }
-
-    private final DrawingHandler mDrawingHandler = new DrawingHandler(this);
-
-    public static class DrawingHandler extends StaticInnerHandlerWrapper<MainKeyboardView> {
-        private static final int MSG_DISMISS_KEY_PREVIEW = 0;
-        private static final int MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
-
-        public DrawingHandler(final MainKeyboardView outerInstance) {
-            super(outerInstance);
-        }
-
-        @Override
-        public void handleMessage(final Message msg) {
-            final MainKeyboardView mainKeyboardView = getOuterInstance();
-            if (mainKeyboardView == null) return;
-            final PointerTracker tracker = (PointerTracker) msg.obj;
-            switch (msg.what) {
-            case MSG_DISMISS_KEY_PREVIEW:
-                final TextView previewText = mainKeyboardView.mKeyPreviewTexts.get(
-                        tracker.mPointerId);
-                if (previewText != null) {
-                    previewText.setVisibility(INVISIBLE);
-                }
-                break;
-            case MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT:
-                mainKeyboardView.showGestureFloatingPreviewText(SuggestedWords.EMPTY);
-                break;
-            }
-        }
-
-        public void dismissKeyPreview(final long delay, final PointerTracker tracker) {
-            sendMessageDelayed(obtainMessage(MSG_DISMISS_KEY_PREVIEW, tracker), delay);
-        }
-
-        public void cancelDismissKeyPreview(final PointerTracker tracker) {
-            removeMessages(MSG_DISMISS_KEY_PREVIEW, tracker);
-        }
-
-        private void cancelAllDismissKeyPreviews() {
-            removeMessages(MSG_DISMISS_KEY_PREVIEW);
-        }
-
-        public void dismissGestureFloatingPreviewText(final long delay) {
-            sendMessageDelayed(obtainMessage(MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT), delay);
-        }
-
-        public void cancelAllMessages() {
-            cancelAllDismissKeyPreviews();
-        }
-    }
+    private final DrawingHandler mDrawingHandler =
+            new DrawingHandler(this);
 
     public MainKeyboardView(final Context context, final AttributeSet attrs) {
         this(context, attrs, R.attr.mainKeyboardViewStyle);
@@ -424,7 +212,26 @@
     public MainKeyboardView(final Context context, final AttributeSet attrs, final int defStyle) {
         super(context, attrs, defStyle);
 
-        PointerTracker.init(getResources());
+        mDrawingPreviewPlacerView = new DrawingPreviewPlacerView(context, attrs);
+
+        final TypedArray mainKeyboardViewAttr = context.obtainStyledAttributes(
+                attrs, R.styleable.MainKeyboardView, defStyle, R.style.MainKeyboardView);
+        final int ignoreAltCodeKeyTimeout = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_ignoreAltCodeKeyTimeout, 0);
+        final int gestureRecognitionUpdateTime = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureRecognitionUpdateTime, 0);
+        mKeyTimerHandler = new TimerHandler(
+                this, ignoreAltCodeKeyTimeout, gestureRecognitionUpdateTime);
+
+        final float keyHysteresisDistance = mainKeyboardViewAttr.getDimension(
+                R.styleable.MainKeyboardView_keyHysteresisDistance, 0.0f);
+        final float keyHysteresisDistanceForSlidingModifier = mainKeyboardViewAttr.getDimension(
+                R.styleable.MainKeyboardView_keyHysteresisDistanceForSlidingModifier, 0.0f);
+        mKeyDetector = new KeyDetector(
+                keyHysteresisDistance, keyHysteresisDistanceForSlidingModifier);
+
+        PointerTracker.init(mainKeyboardViewAttr, mKeyTimerHandler, this /* DrawingProxy */);
+
         final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         final boolean forceNonDistinctMultitouch = prefs.getBoolean(
                 DebugSettings.PREF_FORCE_NON_DISTINCT_MULTITOUCH, false);
@@ -434,24 +241,22 @@
         mNonDistinctMultitouchHelper = hasDistinctMultitouch ? null
                 : new NonDistinctMultitouchHelper();
 
-        mPreviewPlacerView = new PreviewPlacerView(context, attrs);
-
-        final TypedArray mainKeyboardViewAttr = context.obtainStyledAttributes(
-                attrs, R.styleable.MainKeyboardView, defStyle, R.style.MainKeyboardView);
         final int backgroundDimAlpha = mainKeyboardViewAttr.getInt(
                 R.styleable.MainKeyboardView_backgroundDimAlpha, 0);
         mBackgroundDimAlphaPaint.setColor(Color.BLACK);
         mBackgroundDimAlphaPaint.setAlpha(backgroundDimAlpha);
+        mSpacebarBackground = mainKeyboardViewAttr.getDrawable(
+                R.styleable.MainKeyboardView_spacebarBackground);
         mAutoCorrectionSpacebarLedEnabled = mainKeyboardViewAttr.getBoolean(
                 R.styleable.MainKeyboardView_autoCorrectionSpacebarLedEnabled, false);
         mAutoCorrectionSpacebarLedIcon = mainKeyboardViewAttr.getDrawable(
                 R.styleable.MainKeyboardView_autoCorrectionSpacebarLedIcon);
-        mSpacebarTextRatio = mainKeyboardViewAttr.getFraction(
-                R.styleable.MainKeyboardView_spacebarTextRatio, 1, 1, 1.0f);
-        mSpacebarTextColor = mainKeyboardViewAttr.getColor(
-                R.styleable.MainKeyboardView_spacebarTextColor, 0);
-        mSpacebarTextShadowColor = mainKeyboardViewAttr.getColor(
-                R.styleable.MainKeyboardView_spacebarTextShadowColor, 0);
+        mLanguageOnSpacebarTextRatio = mainKeyboardViewAttr.getFraction(
+                R.styleable.MainKeyboardView_languageOnSpacebarTextRatio, 1, 1, 1.0f);
+        mLanguageOnSpacebarTextColor = mainKeyboardViewAttr.getColor(
+                R.styleable.MainKeyboardView_languageOnSpacebarTextColor, 0);
+        mLanguageOnSpacebarTextShadowColor = mainKeyboardViewAttr.getColor(
+                R.styleable.MainKeyboardView_languageOnSpacebarTextShadowColor, 0);
         mLanguageOnSpacebarFinalAlpha = mainKeyboardViewAttr.getInt(
                 R.styleable.MainKeyboardView_languageOnSpacebarFinalAlpha,
                 Constants.Color.ALPHA_OPAQUE);
@@ -462,13 +267,6 @@
         final int altCodeKeyWhileTypingFadeinAnimatorResId = mainKeyboardViewAttr.getResourceId(
                 R.styleable.MainKeyboardView_altCodeKeyWhileTypingFadeinAnimator, 0);
 
-        final float keyHysteresisDistance = mainKeyboardViewAttr.getDimension(
-                R.styleable.MainKeyboardView_keyHysteresisDistance, 0.0f);
-        final float keyHysteresisDistanceForSlidingModifier = mainKeyboardViewAttr.getDimension(
-                R.styleable.MainKeyboardView_keyHysteresisDistanceForSlidingModifier, 0.0f);
-        mKeyDetector = new KeyDetector(
-                keyHysteresisDistance, keyHysteresisDistanceForSlidingModifier);
-        mKeyTimerHandler = new KeyTimerHandler(this, mainKeyboardViewAttr);
         mKeyPreviewOffset = mainKeyboardViewAttr.getDimensionPixelOffset(
                 R.styleable.MainKeyboardView_keyPreviewOffset, 0);
         mKeyPreviewHeight = mainKeyboardViewAttr.getDimensionPixelSize(
@@ -480,6 +278,10 @@
         if (mKeyPreviewLayoutId == 0) {
             mShowKeyPreviewPopup = false;
         }
+        mKeyPreviewZoomInDuration = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_keyPreviewZoomInDuration, 0);
+        mKeyPreviewZoomOutDuration = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_keyPreviewZoomOutDuration, 0);
         final int moreKeysKeyboardLayoutId = mainKeyboardViewAttr.getResourceId(
                 R.styleable.MainKeyboardView_moreKeysKeyboardLayout, 0);
         mConfigShowMoreKeysKeyboardAtTouchedPoint = mainKeyboardViewAttr.getBoolean(
@@ -487,19 +289,18 @@
 
         mGestureFloatingPreviewTextLingerTimeout = mainKeyboardViewAttr.getInt(
                 R.styleable.MainKeyboardView_gestureFloatingPreviewTextLingerTimeout, 0);
-        PointerTracker.setParameters(mainKeyboardViewAttr);
 
-        mGestureFloatingPreviewText = new GestureFloatingPreviewText(
-                mPreviewPlacerView, mainKeyboardViewAttr);
-        mPreviewPlacerView.addPreview(mGestureFloatingPreviewText);
+        mGestureFloatingTextDrawingPreview = new GestureFloatingTextDrawingPreview(
+                mDrawingPreviewPlacerView, mainKeyboardViewAttr);
+        mDrawingPreviewPlacerView.addPreview(mGestureFloatingTextDrawingPreview);
 
-        mGestureTrailsPreview = new GestureTrailsPreview(
-                mPreviewPlacerView, mainKeyboardViewAttr);
-        mPreviewPlacerView.addPreview(mGestureTrailsPreview);
+        mGestureTrailsDrawingPreview = new GestureTrailsDrawingPreview(
+                mDrawingPreviewPlacerView, mainKeyboardViewAttr);
+        mDrawingPreviewPlacerView.addPreview(mGestureTrailsDrawingPreview);
 
-        mSlidingKeyInputPreview = new SlidingKeyInputPreview(
-                mPreviewPlacerView, mainKeyboardViewAttr);
-        mPreviewPlacerView.addPreview(mSlidingKeyInputPreview);
+        mSlidingKeyInputDrawingPreview = new SlidingKeyInputDrawingPreview(
+                mDrawingPreviewPlacerView, mainKeyboardViewAttr);
+        mDrawingPreviewPlacerView.addPreview(mSlidingKeyInputDrawingPreview);
         mainKeyboardViewAttr.recycle();
 
         mMoreKeysKeyboardContainer = LayoutInflater.from(getContext())
@@ -513,14 +314,14 @@
 
         mKeyboardActionListener = KeyboardActionListener.EMPTY_LISTENER;
 
-        mLanguageOnSpacebarHorizontalMargin =
-                (int) getResources().getDimension(R.dimen.language_on_spacebar_horizontal_margin);
+        mLanguageOnSpacebarHorizontalMargin = (int)getResources().getDimension(
+                R.dimen.config_language_on_spacebar_horizontal_margin);
     }
 
     @Override
     public void setHardwareAcceleratedDrawingEnabled(final boolean enabled) {
         super.setHardwareAcceleratedDrawingEnabled(enabled);
-        mPreviewPlacerView.setHardwareAcceleratedDrawingEnabled(enabled);
+        mDrawingPreviewPlacerView.setHardwareAcceleratedDrawingEnabled(enabled);
     }
 
     private ObjectAnimator loadObjectAnimator(final int resId, final Object target) {
@@ -536,6 +337,35 @@
         return animator;
     }
 
+    private static void cancelAndStartAnimators(final ObjectAnimator animatorToCancel,
+            final ObjectAnimator animatorToStart) {
+        if (animatorToCancel == null || animatorToStart == null) {
+            // TODO: Stop using null as a no-operation animator.
+            return;
+        }
+        float startFraction = 0.0f;
+        if (animatorToCancel.isStarted()) {
+            animatorToCancel.cancel();
+            startFraction = 1.0f - animatorToCancel.getAnimatedFraction();
+        }
+        final long startTime = (long)(animatorToStart.getDuration() * startFraction);
+        animatorToStart.start();
+        animatorToStart.setCurrentPlayTime(startTime);
+    }
+
+    // Implements {@link TimerHander.Callbacks} method.
+    @Override
+    public void startWhileTypingFadeinAnimation() {
+        cancelAndStartAnimators(
+                mAltCodeKeyWhileTypingFadeoutAnimator, mAltCodeKeyWhileTypingFadeinAnimator);
+    }
+
+    @Override
+    public void startWhileTypingFadeoutAnimation() {
+        cancelAndStartAnimators(
+                mAltCodeKeyWhileTypingFadeinAnimator, mAltCodeKeyWhileTypingFadeoutAnimator);
+    }
+
     @ExternallyReferenced
     public int getLanguageOnSpacebarAnimAlpha() {
         return mLanguageOnSpacebarAnimAlpha;
@@ -573,28 +403,16 @@
         PointerTracker.setKeyboardActionListener(listener);
     }
 
-    /**
-     * Returns the {@link KeyboardActionListener} object.
-     * @return the listener attached to this keyboard
-     */
-    @Override
-    public KeyboardActionListener getKeyboardActionListener() {
-        return mKeyboardActionListener;
+    // TODO: We should reconsider which coordinate system should be used to represent keyboard
+    // event.
+    public int getKeyX(final int x) {
+        return Constants.isValidCoordinate(x) ? mKeyDetector.getTouchX(x) : x;
     }
 
-    @Override
-    public KeyDetector getKeyDetector() {
-        return mKeyDetector;
-    }
-
-    @Override
-    public DrawingProxy getDrawingProxy() {
-        return this;
-    }
-
-    @Override
-    public TimerProxy getTimerProxy() {
-        return mKeyTimerHandler;
+    // TODO: We should reconsider which coordinate system should be used to represent keyboard
+    // event.
+    public int getKeyY(final int y) {
+        return Constants.isValidCoordinate(y) ? mKeyDetector.getTouchY(y) : y;
     }
 
     /**
@@ -606,8 +424,8 @@
      */
     @Override
     public void setKeyboard(final Keyboard keyboard) {
-        // Remove any pending messages, except dismissing preview and key repeat.
-        mKeyTimerHandler.cancelLongPressTimer();
+        // Remove any pending messages.
+        mKeyTimerHandler.cancelAllKeyTimers();
         super.setKeyboard(keyboard);
         mKeyDetector.setKeyboard(
                 keyboard, -getPaddingLeft(), -getPaddingTop() + getVerticalCorrection());
@@ -615,10 +433,10 @@
         mMoreKeysKeyboardCache.clear();
 
         mSpaceKey = keyboard.getKey(Constants.CODE_SPACE);
-        mSpaceIcon = (mSpaceKey != null)
+        mSpacebarIcon = (mSpaceKey != null)
                 ? mSpaceKey.getIcon(keyboard.mIconsSet, Constants.Color.ALPHA_OPAQUE) : null;
         final int keyHeight = keyboard.mMostCommonKeyHeight - keyboard.mVerticalGap;
-        mSpacebarTextSize = keyHeight * mSpacebarTextRatio;
+        mLanguageOnSpacebarTextSize = keyHeight * mLanguageOnSpacebarTextRatio;
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
             final int orientation = getContext().getResources().getConfiguration().orientation;
             ResearchLogger.mainKeyboardView_setKeyboard(keyboard, orientation);
@@ -642,7 +460,7 @@
     }
 
     private void locatePreviewPlacerView() {
-        if (mPreviewPlacerView.getParent() != null) {
+        if (mDrawingPreviewPlacerView.getParent() != null) {
             return;
         }
         final int width = getWidth();
@@ -665,10 +483,10 @@
         final ViewGroup windowContentView = (ViewGroup)rootView.findViewById(android.R.id.content);
         // Note: It'd be very weird if we get null by android.R.id.content.
         if (windowContentView == null) {
-            Log.w(TAG, "Cannot find android.R.id.content view to add PreviewPlacerView");
+            Log.w(TAG, "Cannot find android.R.id.content view to add DrawingPreviewPlacerView");
         } else {
-            windowContentView.addView(mPreviewPlacerView);
-            mPreviewPlacerView.setKeyboardViewGeometry(mOriginCoords, width, height);
+            windowContentView.addView(mDrawingPreviewPlacerView);
+            mDrawingPreviewPlacerView.setKeyboardViewGeometry(mOriginCoords, width, height);
         }
     }
 
@@ -681,34 +499,33 @@
         return mShowKeyPreviewPopup;
     }
 
-    private void addKeyPreview(final TextView keyPreview) {
-        locatePreviewPlacerView();
-        mPreviewPlacerView.addView(
-                keyPreview, ViewLayoutUtils.newLayoutParam(mPreviewPlacerView, 0, 0));
-    }
-
-    private TextView getKeyPreviewText(final int pointerId) {
-        TextView previewText = mKeyPreviewTexts.get(pointerId);
-        if (previewText != null) {
-            return previewText;
+    private TextView getKeyPreviewTextView(final Key key) {
+        TextView previewTextView = mShowingKeyPreviewTextViews.remove(key);
+        if (previewTextView != null) {
+            return previewTextView;
+        }
+        previewTextView = mFreeKeyPreviewTextViews.poll();
+        if (previewTextView != null) {
+            return previewTextView;
         }
         final Context context = getContext();
         if (mKeyPreviewLayoutId != 0) {
-            previewText = (TextView)LayoutInflater.from(context).inflate(mKeyPreviewLayoutId, null);
+            previewTextView = (TextView)LayoutInflater.from(context)
+                    .inflate(mKeyPreviewLayoutId, null);
         } else {
-            previewText = new TextView(context);
+            previewTextView = new TextView(context);
         }
-        mKeyPreviewTexts.put(pointerId, previewText);
-        return previewText;
+        locatePreviewPlacerView();
+        mDrawingPreviewPlacerView.addView(
+                previewTextView, ViewLayoutUtils.newLayoutParam(mDrawingPreviewPlacerView, 0, 0));
+        return previewTextView;
     }
 
-    private void dismissAllKeyPreviews() {
-        final int pointerCount = mKeyPreviewTexts.size();
-        for (int id = 0; id < pointerCount; id++) {
-            final TextView previewText = mKeyPreviewTexts.get(id);
-            if (previewText != null) {
-                previewText.setVisibility(INVISIBLE);
-            }
+    // Implements {@link DrawingHandler.Callbacks} method.
+    @Override
+    public void dismissAllKeyPreviews() {
+        for (final Key key : new HashSet<Key>(mShowingKeyPreviewTextViews.keySet())) {
+            dismissKeyPreviewWithoutDelay(key);
         }
         PointerTracker.setReleasedKeyGraphicsToAllKeys();
     }
@@ -734,24 +551,9 @@
     private static final int STATE_NORMAL = 0;
     private static final int STATE_HAS_MOREKEYS = 1;
 
+    // TODO: Take this method out of this class.
     @Override
-    public void showKeyPreview(final PointerTracker tracker) {
-        final KeyPreviewDrawParams previewParams = mKeyPreviewDrawParams;
-        final Keyboard keyboard = getKeyboard();
-        if (!mShowKeyPreviewPopup) {
-            previewParams.mPreviewVisibleOffset = -keyboard.mVerticalGap;
-            return;
-        }
-
-        final TextView previewText = getKeyPreviewText(tracker.mPointerId);
-        // If the key preview has no parent view yet, add it to the ViewGroup which can place
-        // key preview absolutely in SoftInputWindow.
-        if (previewText.getParent() == null) {
-            addKeyPreview(previewText);
-        }
-
-        mDrawingHandler.cancelDismissKeyPreview(tracker);
-        final Key key = tracker.getKey();
+    public void showKeyPreview(final Key key) {
         // If key is invalid or IME is already closed, we must not show key preview.
         // Trying to show key preview while root window is closed causes
         // WindowManager.BadTokenException.
@@ -759,38 +561,47 @@
             return;
         }
 
+        final KeyPreviewDrawParams previewParams = mKeyPreviewDrawParams;
+        final Keyboard keyboard = getKeyboard();
+        if (!mShowKeyPreviewPopup) {
+            previewParams.mPreviewVisibleOffset = -keyboard.mVerticalGap;
+            return;
+        }
+
+        final TextView previewTextView = getKeyPreviewTextView(key);
         final KeyDrawParams drawParams = mKeyDrawParams;
-        previewText.setTextColor(drawParams.mPreviewTextColor);
-        final Drawable background = previewText.getBackground();
+        previewTextView.setTextColor(drawParams.mPreviewTextColor);
+        final Drawable background = previewTextView.getBackground();
         final String label = key.getPreviewLabel();
         // What we show as preview should match what we show on a key top in onDraw().
         if (label != null) {
             // TODO Should take care of temporaryShiftLabel here.
-            previewText.setCompoundDrawables(null, null, null, null);
-            previewText.setTextSize(TypedValue.COMPLEX_UNIT_PX,
+            previewTextView.setCompoundDrawables(null, null, null, null);
+            previewTextView.setTextSize(TypedValue.COMPLEX_UNIT_PX,
                     key.selectPreviewTextSize(drawParams));
-            previewText.setTypeface(key.selectPreviewTypeface(drawParams));
-            previewText.setText(label);
+            previewTextView.setTypeface(key.selectPreviewTypeface(drawParams));
+            previewTextView.setText(label);
         } else {
-            previewText.setCompoundDrawables(null, null, null,
+            previewTextView.setCompoundDrawables(null, null, null,
                     key.getPreviewIcon(keyboard.mIconsSet));
-            previewText.setText(null);
+            previewTextView.setText(null);
         }
 
-        previewText.measure(
+        previewTextView.measure(
                 ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
         final int keyDrawWidth = key.getDrawWidth();
-        final int previewWidth = previewText.getMeasuredWidth();
+        final int previewWidth = previewTextView.getMeasuredWidth();
         final int previewHeight = mKeyPreviewHeight;
         // The width and height of visible part of the key preview background. The content marker
         // of the background 9-patch have to cover the visible part of the background.
-        previewParams.mPreviewVisibleWidth = previewWidth - previewText.getPaddingLeft()
-                - previewText.getPaddingRight();
-        previewParams.mPreviewVisibleHeight = previewHeight - previewText.getPaddingTop()
-                - previewText.getPaddingBottom();
+        previewParams.mPreviewVisibleWidth = previewWidth - previewTextView.getPaddingLeft()
+                - previewTextView.getPaddingRight();
+        previewParams.mPreviewVisibleHeight = previewHeight - previewTextView.getPaddingTop()
+                - previewTextView.getPaddingBottom();
         // The distance between the top edge of the parent key and the bottom of the visible part
         // of the key preview background.
-        previewParams.mPreviewVisibleOffset = mKeyPreviewOffset - previewText.getPaddingBottom();
+        previewParams.mPreviewVisibleOffset =
+                mKeyPreviewOffset - previewTextView.getPaddingBottom();
         getLocationInWindow(mOriginCoords);
         // The key preview is horizontally aligned with the center of the visible part of the
         // parent key. If it doesn't fit in this {@link KeyboardView}, it is moved inward to fit and
@@ -817,39 +628,160 @@
             background.setState(KEY_PREVIEW_BACKGROUND_STATE_TABLE[statePosition][hasMoreKeys]);
         }
         ViewLayoutUtils.placeViewAt(
-                previewText, previewX, previewY, previewWidth, previewHeight);
-        previewText.setVisibility(VISIBLE);
+                previewTextView, previewX, previewY, previewWidth, previewHeight);
+
+        if (!isHardwareAccelerated()) {
+            previewTextView.setVisibility(VISIBLE);
+            mShowingKeyPreviewTextViews.put(key, previewTextView);
+            return;
+        }
+        previewTextView.setPivotX(previewWidth / 2.0f);
+        previewTextView.setPivotY(previewHeight);
+
+        final Animator zoomIn = createZoomInAniation(key, previewTextView);
+        final Animator zoomOut = createZoomOutAnimation(key, previewTextView);
+        final KeyPreviewAnimations animation = new KeyPreviewAnimations(zoomIn, zoomOut);
+        previewTextView.setTag(animation);
+        animation.startZoomIn();
     }
 
+    // TODO: Move this internal class out to a separate external class.
+    private static class KeyPreviewAnimations extends AnimatorListenerAdapter {
+        private final Animator mZoomIn;
+        private final Animator mZoomOut;
+
+        public KeyPreviewAnimations(final Animator zoomIn, final Animator zoomOut) {
+            mZoomIn = zoomIn;
+            mZoomOut = zoomOut;
+        }
+
+        public void startZoomIn() {
+            mZoomIn.start();
+        }
+
+        public void startZoomOut() {
+            if (mZoomIn.isRunning()) {
+                mZoomIn.addListener(this);
+                return;
+            }
+            mZoomOut.start();
+        }
+
+        @Override
+        public void onAnimationEnd(final Animator animation) {
+            mZoomOut.start();
+        }
+    }
+
+    // TODO: Take this method out of this class.
+    private Animator createZoomInAniation(final Key key, final TextView previewTextView) {
+        final ObjectAnimator scaleXAnimation = ObjectAnimator.ofFloat(
+                previewTextView, SCALE_X, KEY_PREVIEW_START_ZOOM_IN_SCALE,
+                KEY_PREVIEW_END_ZOOM_IN_SCALE);
+        final ObjectAnimator scaleYAnimation = ObjectAnimator.ofFloat(
+                previewTextView, SCALE_Y, KEY_PREVIEW_START_ZOOM_IN_SCALE,
+                KEY_PREVIEW_END_ZOOM_IN_SCALE);
+        final AnimatorSet zoomInAnimation = new AnimatorSet();
+        zoomInAnimation.play(scaleXAnimation).with(scaleYAnimation);
+        // TODO: Implement preference option to control key preview animation duration.
+        zoomInAnimation.setDuration(mKeyPreviewZoomInDuration);
+        zoomInAnimation.setInterpolator(DECELERATE_INTERPOLATOR);
+        zoomInAnimation.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(final Animator animation) {
+                previewTextView.setVisibility(VISIBLE);
+                mShowingKeyPreviewTextViews.put(key, previewTextView);
+            }
+        });
+        return zoomInAnimation;
+    }
+
+    // TODO: Take this method out of this class.
+    private Animator createZoomOutAnimation(final Key key, final TextView previewTextView) {
+        final ObjectAnimator scaleXAnimation = ObjectAnimator.ofFloat(
+                previewTextView, SCALE_X, KEY_PREVIEW_END_ZOOM_OUT_SCALE);
+        final ObjectAnimator scaleYAnimation = ObjectAnimator.ofFloat(
+                previewTextView, SCALE_Y, KEY_PREVIEW_END_ZOOM_OUT_SCALE);
+        final AnimatorSet zoomOutAnimation = new AnimatorSet();
+        zoomOutAnimation.play(scaleXAnimation).with(scaleYAnimation);
+        // TODO: Implement preference option to control key preview animation duration.
+        zoomOutAnimation.setDuration(mKeyPreviewZoomOutDuration);
+        zoomOutAnimation.setInterpolator(ACCELERATE_INTERPOLATOR);
+        zoomOutAnimation.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(final Animator animation) {
+                dismissKeyPreviewWithoutDelay(key);
+            }
+        });
+        return zoomOutAnimation;
+    }
+
+    // Implements {@link TimerHandler.Callbacks} method.
+    // TODO: Take this method out of this class.
     @Override
-    public void dismissKeyPreview(final PointerTracker tracker) {
-        mDrawingHandler.dismissKeyPreview(mKeyPreviewLingerTimeout, tracker);
+    public void dismissKeyPreviewWithoutDelay(final Key key) {
+        if (key == null) {
+            return;
+        }
+        final TextView previewTextView = mShowingKeyPreviewTextViews.remove(key);
+        if (previewTextView != null) {
+            final Object tag = previewTextView.getTag();
+            if (tag instanceof Animator) {
+                ((Animator)tag).cancel();
+            }
+            previewTextView.setTag(null);
+            previewTextView.setVisibility(INVISIBLE);
+            mFreeKeyPreviewTextViews.add(previewTextView);
+        }
+        // To redraw key top letter.
+        invalidateKey(key);
+    }
+
+    // TODO: Take this method out of this class.
+    @Override
+    public void dismissKeyPreview(final Key key) {
+        final TextView previewTextView = mShowingKeyPreviewTextViews.get(key);
+        if (previewTextView == null) {
+            return;
+        }
+        if (!isHardwareAccelerated()) {
+            // TODO: Implement preference option to control key preview method and duration.
+            mDrawingHandler.dismissKeyPreview(mKeyPreviewLingerTimeout, key);
+            return;
+        }
+        final Object tag = previewTextView.getTag();
+        if (tag instanceof KeyPreviewAnimations) {
+            final KeyPreviewAnimations animation = (KeyPreviewAnimations)tag;
+            animation.startZoomOut();
+        }
     }
 
     public void setSlidingKeyInputPreviewEnabled(final boolean enabled) {
-        mSlidingKeyInputPreview.setPreviewEnabled(enabled);
+        mSlidingKeyInputDrawingPreview.setPreviewEnabled(enabled);
     }
 
     @Override
     public void showSlidingKeyInputPreview(final PointerTracker tracker) {
         locatePreviewPlacerView();
-        mSlidingKeyInputPreview.setPreviewPosition(tracker);
+        mSlidingKeyInputDrawingPreview.setPreviewPosition(tracker);
     }
 
     @Override
     public void dismissSlidingKeyInputPreview() {
-        mSlidingKeyInputPreview.dismissSlidingKeyInputPreview();
+        mSlidingKeyInputDrawingPreview.dismissSlidingKeyInputPreview();
     }
 
     private void setGesturePreviewMode(final boolean isGestureTrailEnabled,
             final boolean isGestureFloatingPreviewTextEnabled) {
-        mGestureFloatingPreviewText.setPreviewEnabled(isGestureFloatingPreviewTextEnabled);
-        mGestureTrailsPreview.setPreviewEnabled(isGestureTrailEnabled);
+        mGestureFloatingTextDrawingPreview.setPreviewEnabled(isGestureFloatingPreviewTextEnabled);
+        mGestureTrailsDrawingPreview.setPreviewEnabled(isGestureTrailEnabled);
     }
 
+    // Implements {@link DrawingHandler.Callbacks} method.
+    @Override
     public void showGestureFloatingPreviewText(final SuggestedWords suggestedWords) {
         locatePreviewPlacerView();
-        mGestureFloatingPreviewText.setSuggetedWords(suggestedWords);
+        mGestureFloatingTextDrawingPreview.setSuggetedWords(suggestedWords);
     }
 
     public void dismissGestureFloatingPreviewText() {
@@ -862,9 +794,9 @@
             final boolean showsFloatingPreviewText) {
         locatePreviewPlacerView();
         if (showsFloatingPreviewText) {
-            mGestureFloatingPreviewText.setPreviewPosition(tracker);
+            mGestureFloatingTextDrawingPreview.setPreviewPosition(tracker);
         }
-        mGestureTrailsPreview.setPreviewPosition(tracker);
+        mGestureTrailsDrawingPreview.setPreviewPosition(tracker);
     }
 
     // Note that this method is called from a non-UI thread.
@@ -894,7 +826,7 @@
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
-        mPreviewPlacerView.removeAllViews();
+        mDrawingPreviewPlacerView.removeAllViews();
         // Notify the ResearchLogger (development only diagnostics) that the keyboard view has
         // been detached.  This is needed to invalidate the reference of {@link MainKeyboardView}
         // to null.
@@ -922,11 +854,13 @@
         return moreKeysKeyboardView;
     }
 
+    // Implements {@link TimerHandler.Callbacks} method.
     /**
      * Called when a key is long pressed.
      * @param tracker the pointer tracker which pressed the parent key
      */
-    private void onLongPress(final PointerTracker tracker) {
+    @Override
+    public void onLongPress(final PointerTracker tracker) {
         if (isShowingMoreKeysPanel()) {
             return;
         }
@@ -982,23 +916,21 @@
         final int pointY = key.getY() + mKeyPreviewDrawParams.mPreviewVisibleOffset;
         moreKeysPanel.showMoreKeysPanel(this, this, pointX, pointY, mKeyboardActionListener);
         tracker.onShowMoreKeysPanel(moreKeysPanel);
+        // TODO: Implement zoom in animation of more keys panel.
+        dismissKeyPreviewWithoutDelay(key);
     }
 
-    public boolean isInSlidingKeyInput() {
+    public boolean isInDraggingFinger() {
         if (isShowingMoreKeysPanel()) {
             return true;
         }
-        return PointerTracker.isAnyInSlidingKeyInput();
+        return PointerTracker.isAnyInDraggingFinger();
     }
 
     @Override
     public void onShowMoreKeysPanel(final MoreKeysPanel panel) {
         locatePreviewPlacerView();
-        // TODO: Remove this check
-        if (panel.isShowingInParent()) {
-            panel.dismissMoreKeysPanel();
-        }
-        mPreviewPlacerView.addView(panel.getContainerView());
+        panel.showInParent(mDrawingPreviewPlacerView);
         mMoreKeysPanel = panel;
         dimEntireKeyboard(true /* dimmed */);
     }
@@ -1016,7 +948,7 @@
     public void onDismissMoreKeysPanel(final MoreKeysPanel panel) {
         dimEntireKeyboard(false /* dimmed */);
         if (isShowingMoreKeysPanel()) {
-            mPreviewPlacerView.removeView(mMoreKeysPanel.getContainerView());
+            mMoreKeysPanel.removeFromParent();
             mMoreKeysPanel = null;
         }
     }
@@ -1049,10 +981,10 @@
         if (mNonDistinctMultitouchHelper != null) {
             if (me.getPointerCount() > 1 && mKeyTimerHandler.isInKeyRepeat()) {
                 // Key repeating timer will be canceled if 2 or more keys are in action.
-                mKeyTimerHandler.cancelKeyRepeatTimer();
+                mKeyTimerHandler.cancelKeyRepeatTimers();
             }
             // Non distinct multitouch screen support
-            mNonDistinctMultitouchHelper.processMotionEvent(me, this);
+            mNonDistinctMultitouchHelper.processMotionEvent(me, mKeyDetector);
             return true;
         }
         return processMotionEvent(me);
@@ -1069,8 +1001,14 @@
 
         final int index = me.getActionIndex();
         final int id = me.getPointerId(index);
-        final PointerTracker tracker = PointerTracker.getPointerTracker(id, this);
-        tracker.processMotionEvent(me, this);
+        final PointerTracker tracker = PointerTracker.getPointerTracker(id);
+        // When a more keys panel is showing, we should ignore other fingers' single touch events
+        // other than the finger that is showing the more keys panel.
+        if (isShowingMoreKeysPanel() && !tracker.isShowingMoreKeysPanel()
+                && PointerTracker.getActivePointerTrackerCount() == 1) {
+            return true;
+        }
+        tracker.processMotionEvent(me, mKeyDetector);
         return true;
     }
 
@@ -1099,8 +1037,8 @@
     @Override
     public boolean dispatchHoverEvent(final MotionEvent event) {
         if (AccessibilityUtils.getInstance().isTouchExplorationEnabled()) {
-            final PointerTracker tracker = PointerTracker.getPointerTracker(0, this);
-            return AccessibleKeyboardViewProxy.getInstance().dispatchHoverEvent(event, tracker);
+            return AccessibleKeyboardViewProxy.getInstance().dispatchHoverEvent(
+                    event, mKeyDetector);
         }
 
         // Reflection doesn't support calling superclass methods.
@@ -1169,12 +1107,30 @@
         }
     }
 
+    // Draw key background.
+    @Override
+    protected void onDrawKeyBackground(final Key key, final Canvas canvas,
+            final Drawable background) {
+        if (key.getCode() == Constants.CODE_SPACE) {
+            super.onDrawKeyBackground(key, canvas, mSpacebarBackground);
+            return;
+        }
+        super.onDrawKeyBackground(key, canvas, background);
+    }
+
     @Override
     protected void onDrawKeyTopVisuals(final Key key, final Canvas canvas, final Paint paint,
             final KeyDrawParams params) {
         if (key.altCodeWhileTyping() && key.isEnabled()) {
             params.mAnimAlpha = mAltCodeKeyWhileTypingAnimAlpha;
         }
+        // Don't draw key top letter when key preview is showing.
+        if (FADE_OUT_KEY_TOP_LETTER_WHEN_KEY_IS_PRESSED
+                && mShowingKeyPreviewTextViews.containsKey(key)) {
+            // TODO: Fade out animation for the key top letter, and fade in animation for the key
+            // background color when the user presses the key.
+            return;
+        }
         final int code = key.getCode();
         if (code == Constants.CODE_SPACE) {
             drawSpacebar(key, canvas, paint);
@@ -1193,7 +1149,7 @@
     private boolean fitsTextIntoWidth(final int width, final String text, final Paint paint) {
         final int maxTextWidth = width - mLanguageOnSpacebarHorizontalMargin * 2;
         paint.setTextScaleX(1.0f);
-        final float textWidth = TypefaceUtils.getLabelWidth(text, paint);
+        final float textWidth = TypefaceUtils.getStringWidth(text, paint);
         if (textWidth < width) {
             return true;
         }
@@ -1204,7 +1160,7 @@
         }
 
         paint.setTextScaleX(scaleX);
-        return TypefaceUtils.getLabelWidth(text, paint) < maxTextWidth;
+        return TypefaceUtils.getStringWidth(text, paint) < maxTextWidth;
     }
 
     // Layout language name on spacebar.
@@ -1238,17 +1194,17 @@
         if (mNeedsToDisplayLanguage) {
             paint.setTextAlign(Align.CENTER);
             paint.setTypeface(Typeface.DEFAULT);
-            paint.setTextSize(mSpacebarTextSize);
+            paint.setTextSize(mLanguageOnSpacebarTextSize);
             final InputMethodSubtype subtype = getKeyboard().mId.mSubtype;
             final String language = layoutLanguageOnSpacebar(paint, subtype, width);
             // Draw language text with shadow
             final float descent = paint.descent();
             final float textHeight = -paint.ascent() + descent;
             final float baseline = height / 2 + textHeight / 2;
-            paint.setColor(mSpacebarTextShadowColor);
+            paint.setColor(mLanguageOnSpacebarTextShadowColor);
             paint.setAlpha(mLanguageOnSpacebarAnimAlpha);
             canvas.drawText(language, width / 2, baseline - descent - 1, paint);
-            paint.setColor(mSpacebarTextColor);
+            paint.setColor(mLanguageOnSpacebarTextColor);
             paint.setAlpha(mLanguageOnSpacebarAnimAlpha);
             canvas.drawText(language, width / 2, baseline - descent, paint);
         }
@@ -1260,18 +1216,18 @@
             int x = (width - iconWidth) / 2;
             int y = height - iconHeight;
             drawIcon(canvas, mAutoCorrectionSpacebarLedIcon, x, y, iconWidth, iconHeight);
-        } else if (mSpaceIcon != null) {
-            final int iconWidth = mSpaceIcon.getIntrinsicWidth();
-            final int iconHeight = mSpaceIcon.getIntrinsicHeight();
+        } else if (mSpacebarIcon != null) {
+            final int iconWidth = mSpacebarIcon.getIntrinsicWidth();
+            final int iconHeight = mSpacebarIcon.getIntrinsicHeight();
             int x = (width - iconWidth) / 2;
             int y = height - iconHeight;
-            drawIcon(canvas, mSpaceIcon, x, y, iconWidth, iconHeight);
+            drawIcon(canvas, mSpacebarIcon, x, y, iconWidth, iconHeight);
         }
     }
 
     @Override
     public void deallocateMemory() {
         super.deallocateMemory();
-        mGestureTrailsPreview.deallocateMemory();
+        mDrawingPreviewPlacerView.deallocateMemory();
     }
 }
diff --git a/java/src/com/android/inputmethod/keyboard/MoreKeysDetector.java b/java/src/com/android/inputmethod/keyboard/MoreKeysDetector.java
index 6b76e24..81b8f04 100644
--- a/java/src/com/android/inputmethod/keyboard/MoreKeysDetector.java
+++ b/java/src/com/android/inputmethod/keyboard/MoreKeysDetector.java
@@ -28,7 +28,7 @@
     }
 
     @Override
-    public boolean alwaysAllowsSlidingInput() {
+    public boolean alwaysAllowsKeySelectionByDraggingFinger() {
         return true;
     }
 
diff --git a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
index 8256d46..6705243 100644
--- a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboard.java
@@ -223,7 +223,7 @@
         }
 
         public int getDefaultKeyCoordX() {
-            return mLeftKeys * mColumnWidth;
+            return mLeftKeys * mColumnWidth + mLeftPadding;
         }
 
         public int getX(final int n, final int row) {
@@ -298,7 +298,7 @@
                 height = keyPreviewDrawParams.mPreviewVisibleHeight + mParams.mVerticalGap;
             } else {
                 final float padding = context.getResources().getDimension(
-                        R.dimen.more_keys_keyboard_key_horizontal_padding)
+                        R.dimen.config_more_keys_keyboard_key_horizontal_padding)
                         + (parentKey.hasLabelsInMoreKeys()
                                 ? mParams.mDefaultKeyWidth * LABEL_PADDING_RATIO : 0.0f);
                 width = getMaxKeyWidth(parentKey, mParams.mDefaultKeyWidth, padding,
@@ -327,7 +327,7 @@
                 // If the label is single letter, minKeyWidth is enough to hold the label.
                 if (label != null && StringUtils.codePointCount(label) > 1) {
                     maxWidth = Math.max(maxWidth,
-                            (int)(TypefaceUtils.getLabelWidth(label, paint) + padding));
+                            (int)(TypefaceUtils.getStringWidth(label, paint) + padding));
                 }
             }
             return maxWidth;
diff --git a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboardView.java b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboardView.java
index 973128d..5b13e9a 100644
--- a/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/MoreKeysKeyboardView.java
@@ -21,6 +21,7 @@
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
+import android.view.ViewGroup;
 
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.R;
@@ -52,7 +53,7 @@
 
         final Resources res = context.getResources();
         mKeyDetector = new MoreKeysDetector(
-                res.getDimension(R.dimen.more_keys_keyboard_slide_allowance));
+                res.getDimension(R.dimen.config_more_keys_keyboard_slide_allowance));
     }
 
     @Override
@@ -81,11 +82,13 @@
         mListener = listener;
         final View container = getContainerView();
         // The coordinates of panel's left-top corner in parentView's coordinate system.
-        final int x = pointX - getDefaultCoordX() - container.getPaddingLeft();
-        final int y = pointY - container.getMeasuredHeight() + container.getPaddingBottom();
+        // We need to consider background drawable paddings.
+        final int x = pointX - getDefaultCoordX() - container.getPaddingLeft() - getPaddingLeft();
+        final int y = pointY - container.getMeasuredHeight() + container.getPaddingBottom()
+                + getPaddingBottom();
 
         parentView.getLocationInWindow(mCoordinates);
-        // Ensure the horizontal position of the panel does not extend past the screen edges.
+        // Ensure the horizontal position of the panel does not extend past the parentView edges.
         final int maxX = parentView.getMeasuredWidth() - container.getMeasuredWidth();
         final int panelX = Math.max(0, Math.min(maxX, x)) + CoordinateUtils.x(mCoordinates);
         final int panelY = y + CoordinateUtils.y(mCoordinates);
@@ -214,12 +217,26 @@
         return true;
     }
 
-    @Override
-    public View getContainerView() {
+    private View getContainerView() {
         return (View)getParent();
     }
 
     @Override
+    public void showInParent(final ViewGroup parentView) {
+        removeFromParent();
+        parentView.addView(getContainerView());
+    }
+
+    @Override
+    public void removeFromParent() {
+        final View containerView = getContainerView();
+        final ViewGroup currentParent = (ViewGroup)containerView.getParent();
+        if (currentParent != null) {
+            currentParent.removeView(containerView);
+        }
+    }
+
+    @Override
     public boolean isShowingInParent() {
         return (getContainerView().getParent() != null);
     }
diff --git a/java/src/com/android/inputmethod/keyboard/MoreKeysPanel.java b/java/src/com/android/inputmethod/keyboard/MoreKeysPanel.java
index 886c628..4a33e65 100644
--- a/java/src/com/android/inputmethod/keyboard/MoreKeysPanel.java
+++ b/java/src/com/android/inputmethod/keyboard/MoreKeysPanel.java
@@ -17,6 +17,7 @@
 package com.android.inputmethod.keyboard;
 
 import android.view.View;
+import android.view.ViewGroup;
 
 public interface MoreKeysPanel {
     public interface Controller {
@@ -119,9 +120,16 @@
     public int translateY(int y);
 
     /**
-     * Return the view containing the more keys panel.
+     * Show this {@link MoreKeysPanel} in the parent view.
+     *
+     * @param parentView the {@link ViewGroup} that hosts this {@link MoreKeysPanel}.
      */
-    public View getContainerView();
+    public void showInParent(ViewGroup parentView);
+
+    /**
+     * Remove this {@link MoreKeysPanel} from the parent view.
+     */
+    public void removeFromParent();
 
     /**
      * Return whether the panel is currently being shown.
diff --git a/java/src/com/android/inputmethod/keyboard/PointerTracker.java b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
index 52f190e..5e02926 100644
--- a/java/src/com/android/inputmethod/keyboard/PointerTracker.java
+++ b/java/src/com/android/inputmethod/keyboard/PointerTracker.java
@@ -19,16 +19,18 @@
 import android.content.res.Resources;
 import android.content.res.TypedArray;
 import android.os.SystemClock;
-import android.util.DisplayMetrics;
 import android.util.Log;
 import android.view.MotionEvent;
 
-import com.android.inputmethod.accessibility.AccessibilityUtils;
-import com.android.inputmethod.keyboard.internal.GestureStroke;
-import com.android.inputmethod.keyboard.internal.GestureStroke.GestureStrokeParams;
-import com.android.inputmethod.keyboard.internal.GestureStrokeWithPreviewPoints;
-import com.android.inputmethod.keyboard.internal.GestureStrokeWithPreviewPoints.GestureStrokePreviewParams;
+import com.android.inputmethod.keyboard.internal.BatchInputArbiter;
+import com.android.inputmethod.keyboard.internal.BatchInputArbiter.BatchInputArbiterListener;
+import com.android.inputmethod.keyboard.internal.BogusMoveEventDetector;
+import com.android.inputmethod.keyboard.internal.GestureEnabler;
+import com.android.inputmethod.keyboard.internal.GestureStrokeDrawingParams;
+import com.android.inputmethod.keyboard.internal.GestureStrokeDrawingPoints;
+import com.android.inputmethod.keyboard.internal.GestureStrokeRecognitionParams;
 import com.android.inputmethod.keyboard.internal.PointerTrackerQueue;
+import com.android.inputmethod.keyboard.internal.TypingTimeRecorder;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.InputPointers;
 import com.android.inputmethod.latin.LatinImeLogger;
@@ -42,50 +44,18 @@
 
 import java.util.ArrayList;
 
-public final class PointerTracker implements PointerTrackerQueue.Element {
+public final class PointerTracker implements PointerTrackerQueue.Element,
+        BatchInputArbiterListener {
     private static final String TAG = PointerTracker.class.getSimpleName();
     private static final boolean DEBUG_EVENT = false;
     private static final boolean DEBUG_MOVE_EVENT = false;
     private static final boolean DEBUG_LISTENER = false;
     private static boolean DEBUG_MODE = LatinImeLogger.sDBG || DEBUG_EVENT;
 
-    /** True if {@link PointerTracker}s should handle gesture events. */
-    private static boolean sShouldHandleGesture = false;
-    private static boolean sMainDictionaryAvailable = false;
-    private static boolean sGestureHandlingEnabledByInputField = false;
-    private static boolean sGestureHandlingEnabledByUser = false;
-
-    public interface KeyEventHandler {
-        /**
-         * Get KeyDetector object that is used for this PointerTracker.
-         * @return the KeyDetector object that is used for this PointerTracker
-         */
-        public KeyDetector getKeyDetector();
-
-        /**
-         * Get KeyboardActionListener object that is used to register key code and so on.
-         * @return the KeyboardActionListner for this PointerTracke
-         */
-        public KeyboardActionListener getKeyboardActionListener();
-
-        /**
-         * Get DrawingProxy object that is used for this PointerTracker.
-         * @return the DrawingProxy object that is used for this PointerTracker
-         */
-        public DrawingProxy getDrawingProxy();
-
-        /**
-         * Get TimerProxy object that handles key repeat and long press timer event for this
-         * PointerTracker.
-         * @return the TimerProxy object that handles key repeat and long press timer event.
-         */
-        public TimerProxy getTimerProxy();
-    }
-
     public interface DrawingProxy {
         public void invalidateKey(Key key);
-        public void showKeyPreview(PointerTracker tracker);
-        public void dismissKeyPreview(PointerTracker tracker);
+        public void showKeyPreview(Key key);
+        public void dismissKeyPreview(Key key);
         public void showSlidingKeyInputPreview(PointerTracker tracker);
         public void dismissSlidingKeyInputPreview();
         public void showGestureTrail(PointerTracker tracker, boolean showsFloatingPreviewText);
@@ -94,13 +64,14 @@
     public interface TimerProxy {
         public void startTypingStateTimer(Key typedKey);
         public boolean isTypingState();
-        public void startKeyRepeatTimer(PointerTracker tracker, int repeatCount, int delay);
-        public void startLongPressTimer(PointerTracker tracker, int delay);
-        public void cancelLongPressTimer();
+        public void startKeyRepeatTimerOf(PointerTracker tracker, int repeatCount, int delay);
+        public void startLongPressTimerOf(PointerTracker tracker, int delay);
+        public void cancelLongPressTimerOf(PointerTracker tracker);
+        public void cancelLongPressShiftKeyTimers();
+        public void cancelKeyTimersOf(PointerTracker tracker);
         public void startDoubleTapShiftKeyTimer();
         public void cancelDoubleTapShiftKeyTimer();
         public boolean isInDoubleTapShiftKeyTimeout();
-        public void cancelKeyTimers();
         public void startUpdateBatchInputTimer(PointerTracker tracker);
         public void cancelUpdateBatchInputTimer(PointerTracker tracker);
         public void cancelAllUpdateBatchInputTimers();
@@ -111,11 +82,15 @@
             @Override
             public boolean isTypingState() { return false; }
             @Override
-            public void startKeyRepeatTimer(PointerTracker tracker, int repeatCount, int delay) {}
+            public void startKeyRepeatTimerOf(PointerTracker tracker, int repeatCount, int delay) {}
             @Override
-            public void startLongPressTimer(PointerTracker tracker, int delay) {}
+            public void startLongPressTimerOf(PointerTracker tracker, int delay) {}
             @Override
-            public void cancelLongPressTimer() {}
+            public void cancelLongPressTimerOf(PointerTracker tracker) {}
+            @Override
+            public void cancelLongPressShiftKeyTimers() {}
+            @Override
+            public void cancelKeyTimersOf(PointerTracker tracker) {}
             @Override
             public void startDoubleTapShiftKeyTimer() {}
             @Override
@@ -123,8 +98,6 @@
             @Override
             public boolean isInDoubleTapShiftKeyTimeout() { return false; }
             @Override
-            public void cancelKeyTimers() {}
-            @Override
             public void startUpdateBatchInputTimer(PointerTracker tracker) {}
             @Override
             public void cancelUpdateBatchInputTimer(PointerTracker tracker) {}
@@ -134,7 +107,7 @@
     }
 
     static final class PointerTrackerParams {
-        public final boolean mSlidingKeyInputEnabled;
+        public final boolean mKeySelectionByDraggingFinger;
         public final int mTouchNoiseThresholdTime;
         public final int mTouchNoiseThresholdDistance;
         public final int mSuppressKeyPreviewAfterBatchInputDuration;
@@ -142,21 +115,9 @@
         public final int mKeyRepeatInterval;
         public final int mLongPressShiftLockTimeout;
 
-        public static final PointerTrackerParams DEFAULT = new PointerTrackerParams();
-
-        private PointerTrackerParams() {
-            mSlidingKeyInputEnabled = false;
-            mTouchNoiseThresholdTime = 0;
-            mTouchNoiseThresholdDistance = 0;
-            mSuppressKeyPreviewAfterBatchInputDuration = 0;
-            mKeyRepeatStartTimeout = 0;
-            mKeyRepeatInterval = 0;
-            mLongPressShiftLockTimeout = 0;
-        }
-
         public PointerTrackerParams(final TypedArray mainKeyboardViewAttr) {
-            mSlidingKeyInputEnabled = mainKeyboardViewAttr.getBoolean(
-                    R.styleable.MainKeyboardView_slidingKeyInputEnable, false);
+            mKeySelectionByDraggingFinger = mainKeyboardViewAttr.getBoolean(
+                    R.styleable.MainKeyboardView_keySelectionByDraggingFinger, false);
             mTouchNoiseThresholdTime = mainKeyboardViewAttr.getInt(
                     R.styleable.MainKeyboardView_touchNoiseThresholdTime, 0);
             mTouchNoiseThresholdDistance = mainKeyboardViewAttr.getDimensionPixelSize(
@@ -172,149 +133,36 @@
         }
     }
 
+    private static GestureEnabler sGestureEnabler = new GestureEnabler();
+
     // Parameters for pointer handling.
     private static PointerTrackerParams sParams;
-    private static GestureStrokeParams sGestureStrokeParams;
-    private static GestureStrokePreviewParams sGesturePreviewParams;
+    private static GestureStrokeRecognitionParams sGestureStrokeRecognitionParams;
+    private static GestureStrokeDrawingParams sGestureStrokeDrawingParams;
     private static boolean sNeedsPhantomSuddenMoveEventHack;
     // Move this threshold to resource.
     // TODO: Device specific parameter would be better for device specific hack?
     private static final float PHANTOM_SUDDEN_MOVE_THRESHOLD = 0.25f; // in keyWidth
-    // This hack is applied to certain classes of tablets.
-    // See {@link #needsProximateBogusDownMoveUpEventHack(Resources)}.
-    private static boolean sNeedsProximateBogusDownMoveUpEventHack;
 
     private static final ArrayList<PointerTracker> sTrackers = CollectionUtils.newArrayList();
     private static final PointerTrackerQueue sPointerTrackerQueue = new PointerTrackerQueue();
 
     public final int mPointerId;
 
-    private DrawingProxy mDrawingProxy;
-    private TimerProxy mTimerProxy;
-    private KeyDetector mKeyDetector;
-    private KeyboardActionListener mListener = KeyboardActionListener.EMPTY_LISTENER;
+    private static DrawingProxy sDrawingProxy;
+    private static TimerProxy sTimerProxy;
+    private static KeyboardActionListener sListener = KeyboardActionListener.EMPTY_LISTENER;
 
+    // The {@link KeyDetector} is set whenever the down event is processed. Also this is updated
+    // when new {@link Keyboard} is set by {@link #setKeyDetector(KeyDetector)}.
+    private KeyDetector mKeyDetector;
     private Keyboard mKeyboard;
-    private int mPhantonSuddenMoveThreshold;
+    private int mPhantomSuddenMoveThreshold;
     private final BogusMoveEventDetector mBogusMoveEventDetector = new BogusMoveEventDetector();
 
     private boolean mIsDetectingGesture = false; // per PointerTracker.
     private static boolean sInGesture = false;
-    private static long sGestureFirstDownTime;
-    private static TimeRecorder sTimeRecorder;
-    private static final InputPointers sAggregratedPointers = new InputPointers(
-            GestureStroke.DEFAULT_CAPACITY);
-    private static int sLastRecognitionPointSize = 0; // synchronized using sAggregratedPointers
-    private static long sLastRecognitionTime = 0; // synchronized using sAggregratedPointers
-
-    static final class BogusMoveEventDetector {
-        // Move these thresholds to resource.
-        // These thresholds' unit is a diagonal length of a key.
-        private static final float BOGUS_MOVE_ACCUMULATED_DISTANCE_THRESHOLD = 0.53f;
-        private static final float BOGUS_MOVE_RADIUS_THRESHOLD = 1.14f;
-
-        private int mAccumulatedDistanceThreshold;
-        private int mRadiusThreshold;
-
-        // Accumulated distance from actual and artificial down keys.
-        /* package */ int mAccumulatedDistanceFromDownKey;
-        private int mActualDownX;
-        private int mActualDownY;
-
-        public void setKeyboardGeometry(final int keyWidth, final int keyHeight) {
-            final float keyDiagonal = (float)Math.hypot(keyWidth, keyHeight);
-            mAccumulatedDistanceThreshold = (int)(
-                    keyDiagonal * BOGUS_MOVE_ACCUMULATED_DISTANCE_THRESHOLD);
-            mRadiusThreshold = (int)(keyDiagonal * BOGUS_MOVE_RADIUS_THRESHOLD);
-        }
-
-        public void onActualDownEvent(final int x, final int y) {
-            mActualDownX = x;
-            mActualDownY = y;
-        }
-
-        public void onDownKey() {
-            mAccumulatedDistanceFromDownKey = 0;
-        }
-
-        public void onMoveKey(final int distance) {
-            mAccumulatedDistanceFromDownKey += distance;
-        }
-
-        public boolean hasTraveledLongDistance(final int x, final int y) {
-            final int dx = Math.abs(x - mActualDownX);
-            final int dy = Math.abs(y - mActualDownY);
-            // A bogus move event should be a horizontal movement. A vertical movement might be
-            // a sloppy typing and should be ignored.
-            return dx >= dy && mAccumulatedDistanceFromDownKey >= mAccumulatedDistanceThreshold;
-        }
-
-        /* package */ int getDistanceFromDownEvent(final int x, final int y) {
-            return getDistance(x, y, mActualDownX, mActualDownY);
-        }
-
-        public boolean isCloseToActualDownEvent(final int x, final int y) {
-            return getDistanceFromDownEvent(x, y) < mRadiusThreshold;
-        }
-    }
-
-    static final class TimeRecorder {
-        private final int mSuppressKeyPreviewAfterBatchInputDuration;
-        private final int mStaticTimeThresholdAfterFastTyping; // msec
-        private long mLastTypingTime;
-        private long mLastLetterTypingTime;
-        private long mLastBatchInputTime;
-
-        public TimeRecorder(final PointerTrackerParams pointerTrackerParams,
-                final GestureStrokeParams gestureStrokeParams) {
-            mSuppressKeyPreviewAfterBatchInputDuration =
-                    pointerTrackerParams.mSuppressKeyPreviewAfterBatchInputDuration;
-            mStaticTimeThresholdAfterFastTyping =
-                    gestureStrokeParams.mStaticTimeThresholdAfterFastTyping;
-        }
-
-        public boolean isInFastTyping(final long eventTime) {
-            final long elapsedTimeSinceLastLetterTyping = eventTime - mLastLetterTypingTime;
-            return elapsedTimeSinceLastLetterTyping < mStaticTimeThresholdAfterFastTyping;
-        }
-
-        private boolean wasLastInputTyping() {
-            return mLastTypingTime >= mLastBatchInputTime;
-        }
-
-        public void onCodeInput(final int code, final long eventTime) {
-            // Record the letter typing time when
-            // 1. Letter keys are typed successively without any batch input in between.
-            // 2. A letter key is typed within the threshold time since the last any key typing.
-            // 3. A non-letter key is typed within the threshold time since the last letter key
-            // typing.
-            if (Character.isLetter(code)) {
-                if (wasLastInputTyping()
-                        || eventTime - mLastTypingTime < mStaticTimeThresholdAfterFastTyping) {
-                    mLastLetterTypingTime = eventTime;
-                }
-            } else {
-                if (eventTime - mLastLetterTypingTime < mStaticTimeThresholdAfterFastTyping) {
-                    // This non-letter typing should be treated as a part of fast typing.
-                    mLastLetterTypingTime = eventTime;
-                }
-            }
-            mLastTypingTime = eventTime;
-        }
-
-        public void onEndBatchInput(final long eventTime) {
-            mLastBatchInputTime = eventTime;
-        }
-
-        public long getLastLetterTypingTime() {
-            return mLastLetterTypingTime;
-        }
-
-        public boolean needsToSuppressKeyPreviewPopup(final long eventTime) {
-            return !wasLastInputTyping()
-                    && eventTime - mLastBatchInputTime < mSuppressKeyPreviewAfterBatchInputDuration;
-        }
-    }
+    private static TypingTimeRecorder sTypingTimeRecorder;
 
     // The position and time at which first down event occurred.
     private long mDownTime;
@@ -341,92 +189,63 @@
     private MoreKeysPanel mMoreKeysPanel;
 
     private static final int MULTIPLIER_FOR_LONG_PRESS_TIMEOUT_IN_SLIDING_INPUT = 3;
-    // true if this pointer is in a sliding key input.
-    boolean mIsInSlidingKeyInput;
-    // true if this pointer is in a sliding key input from a modifier key,
+    // true if this pointer is in the dragging finger mode.
+    boolean mIsInDraggingFinger;
+    // true if this pointer is sliding from a modifier key and in the sliding key input mode,
     // so that further modifier keys should be ignored.
-    boolean mIsInSlidingKeyInputFromModifier;
+    boolean mIsInSlidingKeyInput;
     // if not a NOT_A_CODE, the key of this code is repeating
     private int mCurrentRepeatingKeyCode = Constants.NOT_A_CODE;
 
-    // true if a sliding key input is allowed.
-    private boolean mIsAllowedSlidingKeyInput;
+    // true if dragging finger is allowed.
+    private boolean mIsAllowedDraggingFinger;
 
-    private final GestureStrokeWithPreviewPoints mGestureStrokeWithPreviewPoints;
+    private final BatchInputArbiter mBatchInputArbiter;
+    private final GestureStrokeDrawingPoints mGestureStrokeDrawingPoints;
 
-    private static final int SMALL_TABLET_SMALLEST_WIDTH = 600; // dp
-    private static final int LARGE_TABLET_SMALLEST_WIDTH = 768; // dp
+    // TODO: Add PointerTrackerFactory singleton and move some class static methods into it.
+    public static void init(final TypedArray mainKeyboardViewAttr, final TimerProxy timerProxy,
+            final DrawingProxy drawingProxy) {
+        sParams = new PointerTrackerParams(mainKeyboardViewAttr);
+        sGestureStrokeRecognitionParams = new GestureStrokeRecognitionParams(mainKeyboardViewAttr);
+        sGestureStrokeDrawingParams = new GestureStrokeDrawingParams(mainKeyboardViewAttr);
+        sTypingTimeRecorder = new TypingTimeRecorder(
+                sGestureStrokeRecognitionParams.mStaticTimeThresholdAfterFastTyping,
+                sParams.mSuppressKeyPreviewAfterBatchInputDuration);
 
-    private static boolean needsProximateBogusDownMoveUpEventHack(final Resources res) {
-        // The proximate bogus down move up event hack is needed for a device such like,
-        // 1) is large tablet, or 2) is small tablet and the screen density is less than hdpi.
-        // Though it seems odd to use screen density as criteria of the quality of the touch
-        // screen, the small table that has a less density screen than hdpi most likely has been
-        // made with the touch screen that needs the hack.
-        final int sw = res.getConfiguration().smallestScreenWidthDp;
-        final boolean isLargeTablet = (sw >= LARGE_TABLET_SMALLEST_WIDTH);
-        final boolean isSmallTablet =
-                (sw >= SMALL_TABLET_SMALLEST_WIDTH && sw < LARGE_TABLET_SMALLEST_WIDTH);
-        final int densityDpi = res.getDisplayMetrics().densityDpi;
-        final boolean hasLowDensityScreen = (densityDpi < DisplayMetrics.DENSITY_HIGH);
-        final boolean needsTheHack = isLargeTablet || (isSmallTablet && hasLowDensityScreen);
-        if (DEBUG_MODE) {
-            Log.d(TAG, "needsProximateBogusDownMoveUpEventHack=" + needsTheHack
-                    + " smallestScreenWidthDp=" + sw + " densityDpi=" + densityDpi);
-        }
-        return needsTheHack;
-    }
-
-    public static void init(final Resources res) {
+        final Resources res = mainKeyboardViewAttr.getResources();
         sNeedsPhantomSuddenMoveEventHack = Boolean.parseBoolean(
                 ResourceUtils.getDeviceOverrideValue(
                         res, R.array.phantom_sudden_move_event_device_list));
-        sNeedsProximateBogusDownMoveUpEventHack = needsProximateBogusDownMoveUpEventHack(res);
-        sParams = PointerTrackerParams.DEFAULT;
-        sGestureStrokeParams = GestureStrokeParams.DEFAULT;
-        sGesturePreviewParams = GestureStrokePreviewParams.DEFAULT;
-        sTimeRecorder = new TimeRecorder(sParams, sGestureStrokeParams);
-    }
+        BogusMoveEventDetector.init(res);
 
-    public static void setParameters(final TypedArray mainKeyboardViewAttr) {
-        sParams = new PointerTrackerParams(mainKeyboardViewAttr);
-        sGestureStrokeParams = new GestureStrokeParams(mainKeyboardViewAttr);
-        sGesturePreviewParams = new GestureStrokePreviewParams(mainKeyboardViewAttr);
-        sTimeRecorder = new TimeRecorder(sParams, sGestureStrokeParams);
-    }
-
-    private static void updateGestureHandlingMode() {
-        sShouldHandleGesture = sMainDictionaryAvailable
-                && sGestureHandlingEnabledByInputField
-                && sGestureHandlingEnabledByUser
-                && !AccessibilityUtils.getInstance().isTouchExplorationEnabled();
+        sTimerProxy = timerProxy;
+        sDrawingProxy = drawingProxy;
     }
 
     // Note that this method is called from a non-UI thread.
     public static void setMainDictionaryAvailability(final boolean mainDictionaryAvailable) {
-        sMainDictionaryAvailable = mainDictionaryAvailable;
-        updateGestureHandlingMode();
+        sGestureEnabler.setMainDictionaryAvailability(mainDictionaryAvailable);
     }
 
     public static void setGestureHandlingEnabledByUser(final boolean gestureHandlingEnabledByUser) {
-        sGestureHandlingEnabledByUser = gestureHandlingEnabledByUser;
-        updateGestureHandlingMode();
+        sGestureEnabler.setGestureHandlingEnabledByUser(gestureHandlingEnabledByUser);
     }
 
-    public static PointerTracker getPointerTracker(final int id, final KeyEventHandler handler) {
+    public static PointerTracker getPointerTracker(final int id) {
         final ArrayList<PointerTracker> trackers = sTrackers;
 
         // Create pointer trackers until we can get 'id+1'-th tracker, if needed.
         for (int i = trackers.size(); i <= id; i++) {
-            final PointerTracker tracker = new PointerTracker(i, handler);
+            final PointerTracker tracker = new PointerTracker(i);
             trackers.add(tracker);
         }
 
         return trackers.get(id);
     }
 
-    public static boolean isAnyInSlidingKeyInput() {
-        return sPointerTrackerQueue.isAnyInSlidingKeyInput();
+    public static boolean isAnyInDraggingFinger() {
+        return sPointerTrackerQueue.isAnyInDraggingFinger();
     }
 
     public static void cancelAllPointerTrackers() {
@@ -434,11 +253,7 @@
     }
 
     public static void setKeyboardActionListener(final KeyboardActionListener listener) {
-        final int trackersSize = sTrackers.size();
-        for (int i = 0; i < trackersSize; ++i) {
-            final PointerTracker tracker = sTrackers.get(i);
-            tracker.mListener = listener;
-        }
+        sListener = listener;
     }
 
     public static void setKeyDetector(final KeyDetector keyDetector) {
@@ -446,19 +261,16 @@
         for (int i = 0; i < trackersSize; ++i) {
             final PointerTracker tracker = sTrackers.get(i);
             tracker.setKeyDetectorInner(keyDetector);
-            // Mark that keyboard layout has been changed.
-            tracker.mKeyboardLayoutHasBeenChanged = true;
         }
         final Keyboard keyboard = keyDetector.getKeyboard();
-        sGestureHandlingEnabledByInputField = !keyboard.mId.passwordInput();
-        updateGestureHandlingMode();
+        sGestureEnabler.setPasswordMode(keyboard.mId.passwordInput());
     }
 
     public static void setReleasedKeyGraphicsToAllKeys() {
         final int trackersSize = sTrackers.size();
         for (int i = 0; i < trackersSize; ++i) {
             final PointerTracker tracker = sTrackers.get(i);
-            tracker.setReleasedKeyGraphics(tracker.mCurrentKey);
+            tracker.setReleasedKeyGraphics(tracker.getKey());
         }
     }
 
@@ -466,28 +278,14 @@
         final int trackersSize = sTrackers.size();
         for (int i = 0; i < trackersSize; ++i) {
             final PointerTracker tracker = sTrackers.get(i);
-            if (tracker.isShowingMoreKeysPanel()) {
-                tracker.mMoreKeysPanel.dismissMoreKeysPanel();
-                tracker.mMoreKeysPanel = null;
-            }
+            tracker.dismissMoreKeysPanel();
         }
     }
 
-    private PointerTracker(final int id, final KeyEventHandler handler) {
-        if (handler == null) {
-            throw new NullPointerException();
-        }
+    private PointerTracker(final int id) {
         mPointerId = id;
-        mGestureStrokeWithPreviewPoints = new GestureStrokeWithPreviewPoints(
-                id, sGestureStrokeParams, sGesturePreviewParams);
-        setKeyEventHandler(handler);
-    }
-
-    private void setKeyEventHandler(final KeyEventHandler handler) {
-        setKeyDetectorInner(handler.getKeyDetector());
-        mListener = handler.getKeyboardActionListener();
-        mDrawingProxy = handler.getDrawingProxy();
-        mTimerProxy = handler.getTimerProxy();
+        mBatchInputArbiter = new BatchInputArbiter(id, sGestureStrokeRecognitionParams);
+        mGestureStrokeDrawingPoints = new GestureStrokeDrawingPoints(sGestureStrokeDrawingParams);
     }
 
     // Returns true if keyboard has been changed by this callback.
@@ -500,7 +298,7 @@
         if (sInGesture || mIsDetectingGesture || mIsTrackingForActionDisabled) {
             return false;
         }
-        final boolean ignoreModifierKey = mIsInSlidingKeyInput && key.isModifier();
+        final boolean ignoreModifierKey = mIsInDraggingFinger && key.isModifier();
         if (DEBUG_LISTENER) {
             Log.d(TAG, String.format("[%d] onPress    : %s%s%s%s", mPointerId,
                     KeyDetector.printableCode(key),
@@ -512,10 +310,10 @@
             return false;
         }
         if (key.isEnabled()) {
-            mListener.onPressKey(key.getCode(), repeatCount, getActivePointerTrackerCount() == 1);
+            sListener.onPressKey(key.getCode(), repeatCount, getActivePointerTrackerCount() == 1);
             final boolean keyboardLayoutHasBeenChanged = mKeyboardLayoutHasBeenChanged;
             mKeyboardLayoutHasBeenChanged = false;
-            mTimerProxy.startTypingStateTimer(key);
+            sTimerProxy.startTypingStateTimer(key);
             return keyboardLayoutHasBeenChanged;
         }
         return false;
@@ -525,8 +323,8 @@
     // primaryCode is different from {@link Key#mCode}.
     private void callListenerOnCodeInput(final Key key, final int primaryCode, final int x,
             final int y, final long eventTime) {
-        final boolean ignoreModifierKey = mIsInSlidingKeyInput && key.isModifier();
-        final boolean altersCode = key.altCodeWhileTyping() && mTimerProxy.isTypingState();
+        final boolean ignoreModifierKey = mIsInDraggingFinger && key.isModifier();
+        final boolean altersCode = key.altCodeWhileTyping() && sTimerProxy.isTypingState();
         final int code = altersCode ? key.getAltCode() : primaryCode;
         if (DEBUG_LISTENER) {
             final String output = code == Constants.CODE_OUTPUT_TEXT
@@ -544,11 +342,11 @@
         }
         // Even if the key is disabled, it should respond if it is in the altCodeWhileTyping state.
         if (key.isEnabled() || altersCode) {
-            sTimeRecorder.onCodeInput(code, eventTime);
+            sTypingTimeRecorder.onCodeInput(code, eventTime);
             if (code == Constants.CODE_OUTPUT_TEXT) {
-                mListener.onTextInput(key.getOutputText());
+                sListener.onTextInput(key.getOutputText());
             } else if (code != Constants.CODE_UNSPECIFIED) {
-                mListener.onCodeInput(code, x, y);
+                sListener.onCodeInput(code, x, y);
             }
         }
     }
@@ -561,7 +359,7 @@
         if (sInGesture || mIsDetectingGesture || mIsTrackingForActionDisabled) {
             return;
         }
-        final boolean ignoreModifierKey = mIsInSlidingKeyInput && key.isModifier();
+        final boolean ignoreModifierKey = mIsInDraggingFinger && key.isModifier();
         if (DEBUG_LISTENER) {
             Log.d(TAG, String.format("[%d] onRelease  : %s%s%s%s", mPointerId,
                     Constants.printableCode(primaryCode),
@@ -576,7 +374,7 @@
             return;
         }
         if (key.isEnabled()) {
-            mListener.onReleaseKey(primaryCode, withSliding);
+            sListener.onReleaseKey(primaryCode, withSliding);
         }
     }
 
@@ -584,7 +382,7 @@
         if (DEBUG_LISTENER) {
             Log.d(TAG, String.format("[%d] onFinishSlidingInput", mPointerId));
         }
-        mListener.onFinishSlidingInput();
+        sListener.onFinishSlidingInput();
     }
 
     private void callListenerOnCancelInput() {
@@ -594,7 +392,7 @@
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
             ResearchLogger.pointerTracker_callListenerOnCancelInput();
         }
-        mListener.onCancelInput();
+        sListener.onCancelInput();
     }
 
     private void setKeyDetectorInner(final KeyDetector keyDetector) {
@@ -604,23 +402,25 @@
         }
         mKeyDetector = keyDetector;
         mKeyboard = keyDetector.getKeyboard();
+        // Mark that keyboard layout has been changed.
+        mKeyboardLayoutHasBeenChanged = true;
         final int keyWidth = mKeyboard.mMostCommonKeyWidth;
         final int keyHeight = mKeyboard.mMostCommonKeyHeight;
-        mGestureStrokeWithPreviewPoints.setKeyboardGeometry(keyWidth, mKeyboard.mOccupiedHeight);
+        mBatchInputArbiter.setKeyboardGeometry(keyWidth, mKeyboard.mOccupiedHeight);
         final Key newKey = mKeyDetector.detectHitKey(mKeyX, mKeyY);
         if (newKey != mCurrentKey) {
-            if (mDrawingProxy != null) {
+            if (sDrawingProxy != null) {
                 setReleasedKeyGraphics(mCurrentKey);
             }
             // Keep {@link #mCurrentKey} that comes from previous keyboard.
         }
-        mPhantonSuddenMoveThreshold = (int)(keyWidth * PHANTOM_SUDDEN_MOVE_THRESHOLD);
+        mPhantomSuddenMoveThreshold = (int)(keyWidth * PHANTOM_SUDDEN_MOVE_THRESHOLD);
         mBogusMoveEventDetector.setKeyboardGeometry(keyWidth, keyHeight);
     }
 
     @Override
-    public boolean isInSlidingKeyInput() {
-        return mIsInSlidingKeyInput;
+    public boolean isInDraggingFinger() {
+        return mIsInDraggingFinger;
     }
 
     public Key getKey() {
@@ -637,7 +437,7 @@
     }
 
     private void setReleasedKeyGraphics(final Key key) {
-        mDrawingProxy.dismissKeyPreview(this);
+        sDrawingProxy.dismissKeyPreview(key);
         if (key == null) {
             return;
         }
@@ -668,8 +468,8 @@
     }
 
     private static boolean needsToSuppressKeyPreviewPopup(final long eventTime) {
-        if (!sShouldHandleGesture) return false;
-        return sTimeRecorder.needsToSuppressKeyPreviewPopup(eventTime);
+        if (!sGestureEnabler.shouldHandleGesture()) return false;
+        return sTypingTimeRecorder.needsToSuppressKeyPreviewPopup(eventTime);
     }
 
     private void setPressedKeyGraphics(final Key key, final long eventTime) {
@@ -678,14 +478,14 @@
         }
 
         // Even if the key is disabled, it should respond if it is in the altCodeWhileTyping state.
-        final boolean altersCode = key.altCodeWhileTyping() && mTimerProxy.isTypingState();
+        final boolean altersCode = key.altCodeWhileTyping() && sTimerProxy.isTypingState();
         final boolean needsToUpdateGraphics = key.isEnabled() || altersCode;
         if (!needsToUpdateGraphics) {
             return;
         }
 
         if (!key.noKeyPreview() && !sInGesture && !needsToSuppressKeyPreviewPopup(eventTime)) {
-            mDrawingProxy.showKeyPreview(this);
+            sDrawingProxy.showKeyPreview(key);
         }
         updatePressKeyGraphics(key);
 
@@ -697,7 +497,7 @@
             }
         }
 
-        if (key.altCodeWhileTyping() && mTimerProxy.isTypingState()) {
+        if (altersCode) {
             final int altCode = key.getAltCode();
             final Key altKey = mKeyboard.getKey(altCode);
             if (altKey != null) {
@@ -711,18 +511,18 @@
         }
     }
 
-    private void updateReleaseKeyGraphics(final Key key) {
+    private static void updateReleaseKeyGraphics(final Key key) {
         key.onReleased();
-        mDrawingProxy.invalidateKey(key);
+        sDrawingProxy.invalidateKey(key);
     }
 
-    private void updatePressKeyGraphics(final Key key) {
+    private static void updatePressKeyGraphics(final Key key) {
         key.onPressed();
-        mDrawingProxy.invalidateKey(key);
+        sDrawingProxy.invalidateKey(key);
     }
 
-    public GestureStrokeWithPreviewPoints getGestureStrokeWithPreviewPoints() {
-        return mGestureStrokeWithPreviewPoints;
+    public GestureStrokeDrawingPoints getGestureStrokeDrawingPoints() {
+        return mGestureStrokeDrawingPoints;
     }
 
     public void getLastCoordinates(final int[] outCoords) {
@@ -744,7 +544,7 @@
         return onMoveToNewKey(onMoveKeyInternal(x, y), x, y);
     }
 
-    static int getDistance(final int x1, final int y1, final int x2, final int y2) {
+    private static int getDistance(final int x1, final int y1, final int x2, final int y2) {
         return (int)Math.hypot(x1 - x2, y1 - y2);
     }
 
@@ -766,7 +566,7 @@
         return newKey;
     }
 
-    private static int getActivePointerTrackerCount() {
+    /* package */ static int getActivePointerTrackerCount() {
         return sPointerTrackerQueue.size();
     }
 
@@ -774,91 +574,59 @@
         return sPointerTrackerQueue.getOldestElement() == this;
     }
 
-    private void mayStartBatchInput(final Key key) {
-        if (sInGesture || !mGestureStrokeWithPreviewPoints.isStartOfAGesture()) {
-            return;
-        }
-        if (key == null || !Character.isLetter(key.getCode())) {
-            return;
-        }
+    // Implements {@link BatchInputArbiterListener}.
+    @Override
+    public void onStartBatchInput() {
         if (DEBUG_LISTENER) {
             Log.d(TAG, String.format("[%d] onStartBatchInput", mPointerId));
         }
-        sInGesture = true;
-        synchronized (sAggregratedPointers) {
-            sAggregratedPointers.reset();
-            sLastRecognitionPointSize = 0;
-            sLastRecognitionTime = 0;
-            mListener.onStartBatchInput();
-            dismissAllMoreKeysPanels();
-        }
-        mTimerProxy.cancelLongPressTimer();
-        // A gesture floating preview text will be shown at the oldest pointer/finger on the screen.
-        mDrawingProxy.showGestureTrail(
-                this, isOldestTrackerInQueue() /* showsFloatingPreviewText */);
+        sListener.onStartBatchInput();
+        dismissAllMoreKeysPanels();
+        sTimerProxy.cancelLongPressTimerOf(this);
     }
 
-    public void updateBatchInputByTimer(final long eventTime) {
-        final int gestureTime = (int)(eventTime - sGestureFirstDownTime);
-        mGestureStrokeWithPreviewPoints.duplicateLastPointWith(gestureTime);
-        updateBatchInput(eventTime);
-    }
-
-    private void mayUpdateBatchInput(final long eventTime, final Key key) {
-        if (key != null) {
-            updateBatchInput(eventTime);
-        }
+    private void showGestureTrail() {
         if (mIsTrackingForActionDisabled) {
             return;
         }
         // A gesture floating preview text will be shown at the oldest pointer/finger on the screen.
-        mDrawingProxy.showGestureTrail(
+        sDrawingProxy.showGestureTrail(
                 this, isOldestTrackerInQueue() /* showsFloatingPreviewText */);
     }
 
-    private void updateBatchInput(final long eventTime) {
-        synchronized (sAggregratedPointers) {
-            final GestureStroke stroke = mGestureStrokeWithPreviewPoints;
-            stroke.appendIncrementalBatchPoints(sAggregratedPointers);
-            final int size = sAggregratedPointers.getPointerSize();
-            if (size > sLastRecognitionPointSize
-                    && stroke.hasRecognitionTimePast(eventTime, sLastRecognitionTime)) {
-                if (DEBUG_LISTENER) {
-                    Log.d(TAG, String.format("[%d] onUpdateBatchInput: batchPoints=%d", mPointerId,
-                            size));
-                }
-                mTimerProxy.startUpdateBatchInputTimer(this);
-                mListener.onUpdateBatchInput(sAggregratedPointers);
-                // The listener may change the size of the pointers (when auto-committing
-                // for example), so we need to get the size from the pointers again.
-                sLastRecognitionPointSize = sAggregratedPointers.getPointerSize();
-                sLastRecognitionTime = eventTime;
-            }
-        }
+    public void updateBatchInputByTimer(final long syntheticMoveEventTime) {
+        mBatchInputArbiter.updateBatchInputByTimer(syntheticMoveEventTime, this);
     }
 
-    private void mayEndBatchInput(final long eventTime) {
-        synchronized (sAggregratedPointers) {
-            mGestureStrokeWithPreviewPoints.appendAllBatchPoints(sAggregratedPointers);
-            if (getActivePointerTrackerCount() == 1) {
-                sInGesture = false;
-                sTimeRecorder.onEndBatchInput(eventTime);
-                mTimerProxy.cancelAllUpdateBatchInputTimers();
-                if (!mIsTrackingForActionDisabled) {
-                    if (DEBUG_LISTENER) {
-                        Log.d(TAG, String.format("[%d] onEndBatchInput   : batchPoints=%d",
-                                mPointerId, sAggregratedPointers.getPointerSize()));
-                    }
-                    mListener.onEndBatchInput(sAggregratedPointers);
-                }
-            }
+    // Implements {@link BatchInputArbiterListener}.
+    @Override
+    public void onUpdateBatchInput(final InputPointers aggregatedPointers, final long eventTime) {
+        if (DEBUG_LISTENER) {
+            Log.d(TAG, String.format("[%d] onUpdateBatchInput: batchPoints=%d", mPointerId,
+                    aggregatedPointers.getPointerSize()));
         }
+        sListener.onUpdateBatchInput(aggregatedPointers);
+    }
+
+    // Implements {@link BatchInputArbiterListener}.
+    @Override
+    public void onStartUpdateBatchInputTimer() {
+        sTimerProxy.startUpdateBatchInputTimer(this);
+    }
+
+    // Implements {@link BatchInputArbiterListener}.
+    @Override
+    public void onEndBatchInput(final InputPointers aggregatedPointers, final long eventTime) {
+        sTypingTimeRecorder.onEndBatchInput(eventTime);
+        sTimerProxy.cancelAllUpdateBatchInputTimers();
         if (mIsTrackingForActionDisabled) {
             return;
         }
-        // A gesture floating preview text will be shown at the oldest pointer/finger on the screen.
-        mDrawingProxy.showGestureTrail(
-                this, isOldestTrackerInQueue() /* showsFloatingPreviewText */);
+        if (DEBUG_LISTENER) {
+            Log.d(TAG, String.format("[%d] onEndBatchInput   : batchPoints=%d",
+                    mPointerId, aggregatedPointers.getPointerSize()));
+        }
+        sListener.onEndBatchInput(aggregatedPointers);
     }
 
     private void cancelBatchInput() {
@@ -871,19 +639,26 @@
         if (DEBUG_LISTENER) {
             Log.d(TAG, String.format("[%d] onCancelBatchInput", mPointerId));
         }
-        mListener.onCancelBatchInput();
+        sListener.onCancelBatchInput();
     }
 
-    public void processMotionEvent(final MotionEvent me, final KeyEventHandler handler) {
+    public void processMotionEvent(final MotionEvent me, final KeyDetector keyDetector) {
         final int action = me.getActionMasked();
         final long eventTime = me.getEventTime();
         if (action == MotionEvent.ACTION_MOVE) {
+            // When this pointer is the only active pointer and is showing a more keys panel,
+            // we should ignore other pointers' motion event.
+            final boolean shouldIgnoreOtherPointers =
+                    isShowingMoreKeysPanel() && getActivePointerTrackerCount() == 1;
             final int pointerCount = me.getPointerCount();
             for (int index = 0; index < pointerCount; index++) {
                 final int id = me.getPointerId(index);
-                final PointerTracker tracker = getPointerTracker(id, handler);
+                if (shouldIgnoreOtherPointers && id != mPointerId) {
+                    continue;
+                }
                 final int x = (int)me.getX(index);
                 final int y = (int)me.getY(index);
+                final PointerTracker tracker = getPointerTracker(id);
                 tracker.onMoveEvent(x, y, eventTime, me);
             }
             return;
@@ -894,7 +669,7 @@
         switch (action) {
         case MotionEvent.ACTION_DOWN:
         case MotionEvent.ACTION_POINTER_DOWN:
-            onDownEvent(x, y, eventTime, handler);
+            onDownEvent(x, y, eventTime, keyDetector);
             break;
         case MotionEvent.ACTION_UP:
         case MotionEvent.ACTION_POINTER_UP:
@@ -907,11 +682,11 @@
     }
 
     private void onDownEvent(final int x, final int y, final long eventTime,
-            final KeyEventHandler handler) {
+            final KeyDetector keyDetector) {
         if (DEBUG_EVENT) {
             printTouchEvent("onDownEvent:", x, y, eventTime);
         }
-        setKeyEventHandler(handler);
+        setKeyDetectorInner(keyDetector);
         // Naive up-to-down noise filter.
         final long deltaT = eventTime - mUpTime;
         if (deltaT < sParams.mTouchNoiseThresholdTime) {
@@ -938,7 +713,7 @@
         }
         sPointerTrackerQueue.add(this);
         onDownEventInternal(x, y, eventTime);
-        if (!sShouldHandleGesture) {
+        if (!sGestureEnabler.shouldHandleGesture()) {
             return;
         }
         // A gesture should start only from a non-modifier key. Note that the gesture detection is
@@ -946,28 +721,36 @@
         mIsDetectingGesture = (mKeyboard != null) && mKeyboard.mId.isAlphabetKeyboard()
                 && key != null && !key.isModifier();
         if (mIsDetectingGesture) {
-            if (getActivePointerTrackerCount() == 1) {
-                sGestureFirstDownTime = eventTime;
-            }
-            mGestureStrokeWithPreviewPoints.onDownEvent(x, y, eventTime, sGestureFirstDownTime,
-                    sTimeRecorder.getLastLetterTypingTime());
+            mBatchInputArbiter.addDownEventPoint(x, y, eventTime,
+                    sTypingTimeRecorder.getLastLetterTypingTime(), getActivePointerTrackerCount());
+            mGestureStrokeDrawingPoints.onDownEvent(
+                    x, y, mBatchInputArbiter.getElapsedTimeSinceFirstDown(eventTime));
         }
     }
 
-    private boolean isShowingMoreKeysPanel() {
+    /* package */ boolean isShowingMoreKeysPanel() {
         return (mMoreKeysPanel != null);
     }
 
+    private void dismissMoreKeysPanel() {
+        if (isShowingMoreKeysPanel()) {
+            mMoreKeysPanel.dismissMoreKeysPanel();
+            mMoreKeysPanel = null;
+        }
+    }
+
     private void onDownEventInternal(final int x, final int y, final long eventTime) {
         Key key = onDownKey(x, y, eventTime);
-        // Sliding key is allowed when 1) enabled by configuration, 2) this pointer starts sliding
-        // from modifier key, or 3) this pointer's KeyDetector always allows sliding input.
-        mIsAllowedSlidingKeyInput = sParams.mSlidingKeyInputEnabled
+        // Key selection by dragging finger is allowed when 1) key selection by dragging finger is
+        // enabled by configuration, 2) this pointer starts dragging from modifier key, or 3) this
+        // pointer's KeyDetector always allows key selection by dragging finger, such as
+        // {@link MoreKeysKeyboard}.
+        mIsAllowedDraggingFinger = sParams.mKeySelectionByDraggingFinger
                 || (key != null && key.isModifier())
-                || mKeyDetector.alwaysAllowsSlidingInput();
+                || mKeyDetector.alwaysAllowsKeySelectionByDraggingFinger();
         mKeyboardLayoutHasBeenChanged = false;
         mIsTrackingForActionDisabled = false;
-        resetSlidingKeyInput();
+        resetKeySelectionByDraggingFinger();
         if (key != null) {
             // This onPress call may have changed keyboard layout. Those cases are detected at
             // {@link #setKeyboard}. In those cases, we should update key according to the new
@@ -982,43 +765,47 @@
         }
     }
 
-    private void startSlidingKeyInput(final Key key) {
-        if (!mIsInSlidingKeyInput) {
-            mIsInSlidingKeyInputFromModifier = key.isModifier();
+    private void startKeySelectionByDraggingFinger(final Key key) {
+        if (!mIsInDraggingFinger) {
+            mIsInSlidingKeyInput = key.isModifier();
         }
-        mIsInSlidingKeyInput = true;
+        mIsInDraggingFinger = true;
     }
 
-    private void resetSlidingKeyInput() {
+    private void resetKeySelectionByDraggingFinger() {
+        mIsInDraggingFinger = false;
         mIsInSlidingKeyInput = false;
-        mIsInSlidingKeyInputFromModifier = false;
-        mDrawingProxy.dismissSlidingKeyInputPreview();
+        sDrawingProxy.dismissSlidingKeyInputPreview();
     }
 
     private void onGestureMoveEvent(final int x, final int y, final long eventTime,
             final boolean isMajorEvent, final Key key) {
-        final int gestureTime = (int)(eventTime - sGestureFirstDownTime);
-        if (mIsDetectingGesture) {
-            final int beforeLength = mGestureStrokeWithPreviewPoints.getLength();
-            final boolean onValidArea = mGestureStrokeWithPreviewPoints.addPointOnKeyboard(
-                    x, y, gestureTime, isMajorEvent);
-            if (mGestureStrokeWithPreviewPoints.getLength() > beforeLength) {
-                mTimerProxy.startUpdateBatchInputTimer(this);
+        if (!mIsDetectingGesture) {
+            return;
+        }
+        final boolean onValidArea = mBatchInputArbiter.addMoveEventPoint(
+                x, y, eventTime, isMajorEvent, this);
+        // If the move event goes out from valid batch input area, cancel batch input.
+        if (!onValidArea) {
+            cancelBatchInput();
+            return;
+        }
+        mGestureStrokeDrawingPoints.onMoveEvent(
+                x, y, mBatchInputArbiter.getElapsedTimeSinceFirstDown(eventTime));
+        // If the MoreKeysPanel is showing then do not attempt to enter gesture mode. However,
+        // the gestured touch points are still being recorded in case the panel is dismissed.
+        if (isShowingMoreKeysPanel()) {
+            return;
+        }
+        if (!sInGesture && key != null && Character.isLetter(key.getCode())
+                && mBatchInputArbiter.mayStartBatchInput(this)) {
+            sInGesture = true;
+        }
+        if (sInGesture) {
+            if (key != null) {
+                mBatchInputArbiter.updateBatchInput(eventTime, this);
             }
-            // If the move event goes out from valid batch input area, cancel batch input.
-            if (!onValidArea) {
-                cancelBatchInput();
-                return;
-            }
-            // If the MoreKeysPanel is showing then do not attempt to enter gesture mode. However,
-            // the gestured touch points are still being recorded in case the panel is dismissed.
-            if (isShowingMoreKeysPanel()) {
-                return;
-            }
-            mayStartBatchInput(key);
-            if (sInGesture) {
-                mayUpdateBatchInput(eventTime, key);
-            }
+            showGestureTrail();
         }
     }
 
@@ -1030,7 +817,7 @@
             return;
         }
 
-        if (sShouldHandleGesture && me != null) {
+        if (sGestureEnabler.shouldHandleGesture() && me != null) {
             // Add historical points to gesture path.
             final int pointerIndex = me.findPointerIndex(mPointerId);
             final int historicalSize = me.getHistorySize();
@@ -1048,15 +835,15 @@
             final int translatedY = mMoreKeysPanel.translateY(y);
             mMoreKeysPanel.onMoveEvent(translatedX, translatedY, mPointerId, eventTime);
             onMoveKey(x, y);
-            if (mIsInSlidingKeyInputFromModifier) {
-                mDrawingProxy.showSlidingKeyInputPreview(this);
+            if (mIsInSlidingKeyInput) {
+                sDrawingProxy.showSlidingKeyInputPreview(this);
             }
             return;
         }
         onMoveEventInternal(x, y, eventTime);
     }
 
-    private void processSlidingKeyInput(final Key newKey, final int x, final int y,
+    private void processDraggingFingerInToNewKey(final Key newKey, final int x, final int y,
             final long eventTime) {
         // This onPress call may have changed keyboard layout. Those cases are detected
         // at {@link #setKeyboard}. In those cases, we should update key according
@@ -1110,35 +897,35 @@
         onDownEventInternal(x, y, eventTime);
     }
 
-    private void processSildeOutFromOldKey(final Key oldKey) {
+    private void processDraggingFingerOutFromOldKey(final Key oldKey) {
         setReleasedKeyGraphics(oldKey);
         callListenerOnRelease(oldKey, oldKey.getCode(), true /* withSliding */);
-        startSlidingKeyInput(oldKey);
-        mTimerProxy.cancelKeyTimers();
+        startKeySelectionByDraggingFinger(oldKey);
+        sTimerProxy.cancelKeyTimersOf(this);
     }
 
-    private void slideFromOldKeyToNewKey(final Key key, final int x, final int y,
+    private void dragFingerFromOldKeyToNewKey(final Key key, final int x, final int y,
             final long eventTime, final Key oldKey, final int lastX, final int lastY) {
         // The pointer has been slid in to the new key from the previous key, we must call
         // onRelease() first to notify that the previous key has been released, then call
         // onPress() to notify that the new key is being pressed.
-        processSildeOutFromOldKey(oldKey);
+        processDraggingFingerOutFromOldKey(oldKey);
         startRepeatKey(key);
-        if (mIsAllowedSlidingKeyInput) {
-            processSlidingKeyInput(key, x, y, eventTime);
+        if (mIsAllowedDraggingFinger) {
+            processDraggingFingerInToNewKey(key, x, y, eventTime);
         }
         // HACK: On some devices, quick successive touches may be reported as a sudden move by
         // touch panel firmware. This hack detects such cases and translates the move event to
         // successive up and down events.
         // TODO: Should find a way to balance gesture detection and this hack.
         else if (sNeedsPhantomSuddenMoveEventHack
-                && getDistance(x, y, lastX, lastY) >= mPhantonSuddenMoveThreshold) {
+                && getDistance(x, y, lastX, lastY) >= mPhantomSuddenMoveThreshold) {
             processPhantomSuddenMoveHack(key, x, y, eventTime, oldKey, lastX, lastY);
         }
         // HACK: On some devices, quick successive proximate touches may be reported as a bogus
         // down-move-up event by touch panel firmware. This hack detects such cases and breaks
         // these events into separate up and down events.
-        else if (sNeedsProximateBogusDownMoveUpEventHack && sTimeRecorder.isInFastTyping(eventTime)
+        else if (sTypingTimeRecorder.isInFastTyping(eventTime)
                 && mBogusMoveEventDetector.isCloseToActualDownEvent(x, y)) {
             processProximateBogusDownMoveUpEventHack(key, x, y, eventTime, oldKey, lastX, lastY);
         }
@@ -1163,11 +950,11 @@
         }
     }
 
-    private void slideOutFromOldKey(final Key oldKey, final int x, final int y) {
+    private void dragFingerOutFromOldKey(final Key oldKey, final int x, final int y) {
         // The pointer has been slid out from the previous key, we must call onRelease() to
         // notify that the previous key has been released.
-        processSildeOutFromOldKey(oldKey);
-        if (mIsAllowedSlidingKeyInput) {
+        processDraggingFingerOutFromOldKey(oldKey);
+        if (mIsAllowedDraggingFinger) {
             onMoveToNewKey(null, x, y);
         } else {
             if (!mIsDetectingGesture) {
@@ -1182,7 +969,7 @@
         final Key oldKey = mCurrentKey;
         final Key newKey = onMoveKey(x, y);
 
-        if (sShouldHandleGesture) {
+        if (sGestureEnabler.shouldHandleGesture()) {
             // Register move event on gesture tracker.
             onGestureMoveEvent(x, y, eventTime, true /* isMajorEvent */, newKey);
             if (sInGesture) {
@@ -1194,19 +981,19 @@
 
         if (newKey != null) {
             if (oldKey != null && isMajorEnoughMoveToBeOnNewKey(x, y, eventTime, newKey)) {
-                slideFromOldKeyToNewKey(newKey, x, y, eventTime, oldKey, lastX, lastY);
+                dragFingerFromOldKeyToNewKey(newKey, x, y, eventTime, oldKey, lastX, lastY);
             } else if (oldKey == null) {
                 // The pointer has been slid in to the new key, but the finger was not on any keys.
                 // In this case, we must call onPress() to notify that the new key is being pressed.
-                processSlidingKeyInput(newKey, x, y, eventTime);
+                processDraggingFingerInToNewKey(newKey, x, y, eventTime);
             }
         } else { // newKey == null
             if (oldKey != null && isMajorEnoughMoveToBeOnNewKey(x, y, eventTime, newKey)) {
-                slideOutFromOldKey(oldKey, x, y);
+                dragFingerOutFromOldKey(oldKey, x, y);
             }
         }
-        if (mIsInSlidingKeyInputFromModifier) {
-            mDrawingProxy.showSlidingKeyInputPreview(this);
+        if (mIsInSlidingKeyInput) {
+            sDrawingProxy.showSlidingKeyInputPreview(this);
         }
     }
 
@@ -1215,7 +1002,7 @@
             printTouchEvent("onUpEvent  :", x, y, eventTime);
         }
 
-        mTimerProxy.cancelUpdateBatchInputTimer(this);
+        sTimerProxy.cancelUpdateBatchInputTimer(this);
         if (!sInGesture) {
             if (mCurrentKey != null && mCurrentKey.isModifier()) {
                 // Before processing an up event of modifier key, all pointers already being
@@ -1237,18 +1024,15 @@
         if (DEBUG_EVENT) {
             printTouchEvent("onPhntEvent:", mLastX, mLastY, eventTime);
         }
-        if (isShowingMoreKeysPanel()) {
-            return;
-        }
         onUpEventInternal(mLastX, mLastY, eventTime);
         cancelTrackingForAction();
     }
 
     private void onUpEventInternal(final int x, final int y, final long eventTime) {
-        mTimerProxy.cancelKeyTimers();
+        sTimerProxy.cancelKeyTimersOf(this);
+        final boolean isInDraggingFinger = mIsInDraggingFinger;
         final boolean isInSlidingKeyInput = mIsInSlidingKeyInput;
-        final boolean isInSlidingKeyInputFromModifier = mIsInSlidingKeyInputFromModifier;
-        resetSlidingKeyInput();
+        resetKeySelectionByDraggingFinger();
         mIsDetectingGesture = false;
         final Key currentKey = mCurrentKey;
         mCurrentKey = null;
@@ -1272,7 +1056,11 @@
             if (currentKey != null) {
                 callListenerOnRelease(currentKey, currentKey.getCode(), true /* withSliding */);
             }
-            mayEndBatchInput(eventTime);
+            if (mBatchInputArbiter.mayEndBatchInput(
+                    eventTime, getActivePointerTrackerCount(), this)) {
+                sInGesture = false;
+            }
+            showGestureTrail();
             return;
         }
 
@@ -1280,11 +1068,11 @@
             return;
         }
         if (currentKey != null && currentKey.isRepeatable()
-                && (currentKey.getCode() == currentRepeatingKeyCode) && !isInSlidingKeyInput) {
+                && (currentKey.getCode() == currentRepeatingKeyCode) && !isInDraggingFinger) {
             return;
         }
         detectAndSendKey(currentKey, mKeyX, mKeyY, eventTime);
-        if (isInSlidingKeyInputFromModifier) {
+        if (isInSlidingKeyInput) {
             callListenerOnFinishSlidingInput();
         }
     }
@@ -1306,7 +1094,7 @@
     }
 
     public void onLongPressed() {
-        resetSlidingKeyInput();
+        resetKeySelectionByDraggingFinger();
         cancelTrackingForAction();
         setReleasedKeyGraphics(mCurrentKey);
         sPointerTrackerQueue.remove(this);
@@ -1324,9 +1112,9 @@
     }
 
     private void onCancelEventInternal() {
-        mTimerProxy.cancelKeyTimers();
+        sTimerProxy.cancelKeyTimersOf(this);
         setReleasedKeyGraphics(mCurrentKey);
-        resetSlidingKeyInput();
+        resetKeySelectionByDraggingFinger();
         if (isShowingMoreKeysPanel()) {
             mMoreKeysPanel.dismissMoreKeysPanel();
             mMoreKeysPanel = null;
@@ -1347,7 +1135,7 @@
         }
         // Here curKey points to the different key from newKey.
         final int keyHysteresisDistanceSquared = mKeyDetector.getKeyHysteresisDistanceSquared(
-                mIsInSlidingKeyInputFromModifier);
+                mIsInSlidingKeyInput);
         final int distanceFromKeyEdgeSquared = curKey.squaredDistanceToEdge(x, y);
         if (distanceFromKeyEdgeSquared >= keyHysteresisDistanceSquared) {
             if (DEBUG_MODE) {
@@ -1358,14 +1146,13 @@
             }
             return true;
         }
-        if (sNeedsProximateBogusDownMoveUpEventHack && !mIsAllowedSlidingKeyInput
-                && sTimeRecorder.isInFastTyping(eventTime)
+        if (!mIsAllowedDraggingFinger && sTypingTimeRecorder.isInFastTyping(eventTime)
                 && mBogusMoveEventDetector.hasTraveledLongDistance(x, y)) {
             if (DEBUG_MODE) {
                 final float keyDiagonal = (float)Math.hypot(
                         mKeyboard.mMostCommonKeyWidth, mKeyboard.mMostCommonKeyHeight);
                 final float lengthFromDownRatio =
-                        mBogusMoveEventDetector.mAccumulatedDistanceFromDownKey / keyDiagonal;
+                        mBogusMoveEventDetector.getAccumulatedDistanceFromDownKey() / keyDiagonal;
                 Log.d(TAG, String.format("[%d] isMajorEnoughMoveToBeOnNewKey:"
                         + " %.2f key diagonal from virtual down point",
                         mPointerId, lengthFromDownRatio));
@@ -1376,30 +1163,34 @@
     }
 
     private void startLongPressTimer(final Key key) {
+        // Note that we need to cancel all active long press shift key timers if any whenever we
+        // start a new long press timer for both non-shift and shift keys.
+        sTimerProxy.cancelLongPressShiftKeyTimers();
         if (sInGesture) return;
         if (key == null) return;
         if (!key.isLongPressEnabled()) return;
         // Caveat: Please note that isLongPressEnabled() can be true even if the current key
-        // doesn't have its more keys. (e.g. spacebar, globe key)
+        // doesn't have its more keys. (e.g. spacebar, globe key) If we are in the dragging finger
+        // mode, we will disable long press timer of such key.
         // We always need to start the long press timer if the key has its more keys regardless of
-        // whether or not we are in the sliding input mode.
-        if (mIsInSlidingKeyInput && key.getMoreKeys() == null) return;
-        final int delay;
-        switch (key.getCode()) {
-        case Constants.CODE_SHIFT:
-            delay = sParams.mLongPressShiftLockTimeout;
-            break;
-        default:
-            final int longpressTimeout = Settings.getInstance().getCurrent().mKeyLongpressTimeout;
-            if (mIsInSlidingKeyInputFromModifier) {
-                // We use longer timeout for sliding finger input started from the modifier key.
-                delay = longpressTimeout * MULTIPLIER_FOR_LONG_PRESS_TIMEOUT_IN_SLIDING_INPUT;
-            } else {
-                delay = longpressTimeout;
-            }
-            break;
+        // whether or not we are in the dragging finger mode.
+        if (mIsInDraggingFinger && key.getMoreKeys() == null) return;
+
+        final int delay = getLongPressTimeout(key.getCode());
+        if (delay <= 0) return;
+        sTimerProxy.startLongPressTimerOf(this, delay);
+    }
+
+    private int getLongPressTimeout(final int code) {
+        if (code == Constants.CODE_SHIFT) {
+            return sParams.mLongPressShiftLockTimeout;
         }
-        mTimerProxy.startLongPressTimer(this, delay);
+        final int longpressTimeout = Settings.getInstance().getCurrent().mKeyLongpressTimeout;
+        if (mIsInSlidingKeyInput) {
+            // We use longer timeout for sliding finger input started from the modifier key.
+            return longpressTimeout * MULTIPLIER_FOR_LONG_PRESS_TIMEOUT_IN_SLIDING_INPUT;
+        }
+        return longpressTimeout;
     }
 
     private void detectAndSendKey(final Key key, final int x, final int y, final long eventTime) {
@@ -1417,10 +1208,10 @@
         if (sInGesture) return;
         if (key == null) return;
         if (!key.isRepeatable()) return;
-        // Don't start key repeat when we are in sliding input mode.
-        if (mIsInSlidingKeyInput) return;
+        // Don't start key repeat when we are in the dragging finger mode.
+        if (mIsInDraggingFinger) return;
         final int startRepeatCount = 1;
-        mTimerProxy.startKeyRepeatTimer(this, startRepeatCount, sParams.mKeyRepeatStartTimeout);
+        startKeyRepeatTimer(startRepeatCount);
     }
 
     public void onKeyRepeat(final int code, final int repeatCount) {
@@ -1432,11 +1223,17 @@
         mCurrentRepeatingKeyCode = code;
         mIsDetectingGesture = false;
         final int nextRepeatCount = repeatCount + 1;
-        mTimerProxy.startKeyRepeatTimer(this, nextRepeatCount, sParams.mKeyRepeatInterval);
+        startKeyRepeatTimer(nextRepeatCount);
         callListenerOnPressAndCheckKeyboardLayoutChange(key, repeatCount);
         callListenerOnCodeInput(key, code, mKeyX, mKeyY, SystemClock.uptimeMillis());
     }
 
+    private void startKeyRepeatTimer(final int repeatCount) {
+        final int delay =
+                (repeatCount == 1) ? sParams.mKeyRepeatStartTimeout : sParams.mKeyRepeatInterval;
+        sTimerProxy.startKeyRepeatTimerOf(this, repeatCount, delay);
+    }
+
     private void printTouchEvent(final String title, final int x, final int y,
             final long eventTime) {
         final Key key = mKeyDetector.detectHitKey(x, y);
diff --git a/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java b/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java
index b814fc1..cd7dd6f 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/AbstractDrawingPreview.java
@@ -22,8 +22,9 @@
 import com.android.inputmethod.keyboard.PointerTracker;
 
 /**
- * Abstract base class for previews that are drawn on PreviewPlacerView, e.g.,
- * GestureFloatingPrevewText, GestureTrail, and SlidingKeyInputPreview.
+ * Abstract base class for previews that are drawn on DrawingPreviewPlacerView, e.g.,
+ * GestureFloatingTextDrawingPreview, GestureTrailsDrawingPreview, and
+ * SlidingKeyInputDrawingPreview.
  */
 public abstract class AbstractDrawingPreview {
     private final View mDrawingView;
@@ -49,9 +50,7 @@
         // Default implementation is empty.
     }
 
-    public void onDetachFromWindow() {
-        // Default implementation is empty.
-    }
+    public abstract void onDeallocateMemory();
 
     /**
      * Draws the preview
diff --git a/java/src/com/android/inputmethod/keyboard/internal/BatchInputArbiter.java b/java/src/com/android/inputmethod/keyboard/internal/BatchInputArbiter.java
new file mode 100644
index 0000000..cd98759
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/BatchInputArbiter.java
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import com.android.inputmethod.latin.Constants;
+import com.android.inputmethod.latin.InputPointers;
+
+/**
+ * This class arbitrates batch input.
+ * An instance of this class holds a {@link GestureStrokeRecognitionPoints}.
+ * And it arbitrates multiple strokes gestured by multiple fingers and aggregates those gesture
+ * points into one batch input.
+ */
+public class BatchInputArbiter {
+    public interface BatchInputArbiterListener {
+        public void onStartBatchInput();
+        public void onUpdateBatchInput(
+                final InputPointers aggregatedPointers, final long moveEventTime);
+        public void onStartUpdateBatchInputTimer();
+        public void onEndBatchInput(final InputPointers aggregatedPointers, final long upEventTime);
+    }
+
+    // The starting time of the first stroke of a gesture input.
+    private static long sGestureFirstDownTime;
+    // The {@link InputPointers} that includes all events of a gesture input.
+    private static final InputPointers sAggregatedPointers = new InputPointers(
+            Constants.DEFAULT_GESTURE_POINTS_CAPACITY);
+    private static int sLastRecognitionPointSize = 0; // synchronized using sAggregatedPointers
+    private static long sLastRecognitionTime = 0; // synchronized using sAggregatedPointers
+
+    private final GestureStrokeRecognitionPoints mRecognitionPoints;
+
+    public BatchInputArbiter(final int pointerId, final GestureStrokeRecognitionParams params) {
+        mRecognitionPoints = new GestureStrokeRecognitionPoints(pointerId, params);
+    }
+
+    public void setKeyboardGeometry(final int keyWidth, final int keyboardHeight) {
+        mRecognitionPoints.setKeyboardGeometry(keyWidth, keyboardHeight);
+    }
+
+    /**
+     * Calculate elapsed time since the first gesture down.
+     * @param eventTime the time of this event.
+     * @return the elapsed time in millisecond from the first gesture down.
+     */
+    public int getElapsedTimeSinceFirstDown(final long eventTime) {
+        return (int)(eventTime - sGestureFirstDownTime);
+    }
+
+    /**
+     * Add a down event point.
+     * @param x the x-coordinate of this down event.
+     * @param y the y-coordinate of this down event.
+     * @param downEventTime the time of this down event.
+     * @param lastLetterTypingTime the last typing input time.
+     * @param activePointerCount the number of active pointers when this pointer down event occurs.
+     */
+    public void addDownEventPoint(final int x, final int y, final long downEventTime,
+            final long lastLetterTypingTime, final int activePointerCount) {
+        if (activePointerCount == 1) {
+            sGestureFirstDownTime = downEventTime;
+        }
+        final int elapsedTimeSinceFirstDown = getElapsedTimeSinceFirstDown(downEventTime);
+        final int elapsedTimeSinceLastTyping = (int)(downEventTime - lastLetterTypingTime);
+        mRecognitionPoints.addDownEventPoint(
+                x, y, elapsedTimeSinceFirstDown, elapsedTimeSinceLastTyping);
+    }
+
+    /**
+     * Add a move event point.
+     * @param x the x-coordinate of this move event.
+     * @param y the y-coordinate of this move event.
+     * @param moveEventTime the time of this move event.
+     * @param isMajorEvent false if this is a historical move event.
+     * @param listener {@link BatchInputArbiterListener#onStartUpdateBatchInputTimer()} of this
+     *     <code>listener</code> may be called if enough move points have been added.
+     * @return true if this move event occurs on the valid gesture area.
+     */
+    public boolean addMoveEventPoint(final int x, final int y, final long moveEventTime,
+            final boolean isMajorEvent, final BatchInputArbiterListener listener) {
+        final int beforeLength = mRecognitionPoints.getLength();
+        final boolean onValidArea = mRecognitionPoints.addEventPoint(
+                x, y, getElapsedTimeSinceFirstDown(moveEventTime), isMajorEvent);
+        if (mRecognitionPoints.getLength() > beforeLength) {
+            listener.onStartUpdateBatchInputTimer();
+        }
+        return onValidArea;
+    }
+
+    /**
+     * Determine whether the batch input has started or not.
+     * @param listener {@link BatchInputArbiterListener#onStartBatchInput()} of this
+     *     <code>listener</code> will be called when the batch input has started successfully.
+     * @return true if the batch input has started successfully.
+     */
+    public boolean mayStartBatchInput(final BatchInputArbiterListener listener) {
+        if (!mRecognitionPoints.isStartOfAGesture()) {
+            return false;
+        }
+        synchronized (sAggregatedPointers) {
+            sAggregatedPointers.reset();
+            sLastRecognitionPointSize = 0;
+            sLastRecognitionTime = 0;
+            listener.onStartBatchInput();
+        }
+        return true;
+    }
+
+    /**
+     * Add synthetic move event point. After adding the point,
+     * {@link #updateBatchInput(long,BatchInputArbiterListener)} will be called internally.
+     * @param syntheticMoveEventTime the synthetic move event time.
+     * @param listener the listener to be passed to
+     *     {@link #updateBatchInput(long,BatchInputArbiterListener)}.
+     */
+    public void updateBatchInputByTimer(final long syntheticMoveEventTime,
+            final BatchInputArbiterListener listener) {
+        mRecognitionPoints.duplicateLastPointWith(
+                getElapsedTimeSinceFirstDown(syntheticMoveEventTime));
+        updateBatchInput(syntheticMoveEventTime, listener);
+    }
+
+    /**
+     * Determine whether we have enough gesture points to lookup dictionary.
+     * @param moveEventTime the time of this move event.
+     * @param listener {@link BatchInputArbiterListener#onUpdateBatchInput(InputPointers,long)} of
+     *     this <code>listener</code> will be called when enough event points we have. Also
+     *     {@link BatchInputArbiterListener#onStartUpdateBatchInputTimer()} will be called to have
+     *     possible future synthetic move event.
+     */
+    public void updateBatchInput(final long moveEventTime,
+            final BatchInputArbiterListener listener) {
+        synchronized (sAggregatedPointers) {
+            mRecognitionPoints.appendIncrementalBatchPoints(sAggregatedPointers);
+            final int size = sAggregatedPointers.getPointerSize();
+            if (size > sLastRecognitionPointSize && mRecognitionPoints.hasRecognitionTimePast(
+                    moveEventTime, sLastRecognitionTime)) {
+                listener.onUpdateBatchInput(sAggregatedPointers, moveEventTime);
+                listener.onStartUpdateBatchInputTimer();
+                // The listener may change the size of the pointers (when auto-committing
+                // for example), so we need to get the size from the pointers again.
+                sLastRecognitionPointSize = sAggregatedPointers.getPointerSize();
+                sLastRecognitionTime = moveEventTime;
+            }
+        }
+    }
+
+    /**
+     * Determine whether the batch input has ended successfully or continues.
+     * @param upEventTime the time of this up event.
+     * @param activePointerCount the number of active pointers when this pointer up event occurs.
+     * @param listener {@link BatchInputArbiterListener#onEndBatchInput(InputPointers,long)} of this
+     *     <code>listener</code> will be called when the batch input has started successfully.
+     * @return true if the batch input has ended successfully.
+     */
+    public boolean mayEndBatchInput(final long upEventTime, final int activePointerCount,
+            final BatchInputArbiterListener listener) {
+        synchronized (sAggregatedPointers) {
+            mRecognitionPoints.appendAllBatchPoints(sAggregatedPointers);
+            if (activePointerCount == 1) {
+                listener.onEndBatchInput(sAggregatedPointers, upEventTime);
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/BogusMoveEventDetector.java b/java/src/com/android/inputmethod/keyboard/internal/BogusMoveEventDetector.java
new file mode 100644
index 0000000..e0589fc
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/BogusMoveEventDetector.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.content.res.Resources;
+import android.util.DisplayMetrics;
+import android.util.Log;
+
+import com.android.inputmethod.latin.Constants;
+import com.android.inputmethod.latin.LatinImeLogger;
+import com.android.inputmethod.latin.R;
+
+// This hack is applied to certain classes of tablets.
+public final class BogusMoveEventDetector {
+    private static final String TAG = BogusMoveEventDetector.class.getSimpleName();
+    private static final boolean DEBUG_MODE = LatinImeLogger.sDBG;
+
+    // Move these thresholds to resource.
+    // These thresholds' unit is a diagonal length of a key.
+    private static final float BOGUS_MOVE_ACCUMULATED_DISTANCE_THRESHOLD = 0.53f;
+    private static final float BOGUS_MOVE_RADIUS_THRESHOLD = 1.14f;
+
+    private static boolean sNeedsProximateBogusDownMoveUpEventHack;
+
+    public static void init(final Resources res) {
+        // The proximate bogus down move up event hack is needed for a device such like,
+        // 1) is large tablet, or 2) is small tablet and the screen density is less than hdpi.
+        // Though it seems odd to use screen density as criteria of the quality of the touch
+        // screen, the small table that has a less density screen than hdpi most likely has been
+        // made with the touch screen that needs the hack.
+        final int screenMetrics = res.getInteger(R.integer.config_screen_metrics);
+        final boolean isLargeTablet = (screenMetrics == Constants.SCREEN_METRICS_LARGE_TABLET);
+        final boolean isSmallTablet = (screenMetrics == Constants.SCREEN_METRICS_SMALL_TABLET);
+        final int densityDpi = res.getDisplayMetrics().densityDpi;
+        final boolean hasLowDensityScreen = (densityDpi < DisplayMetrics.DENSITY_HIGH);
+        final boolean needsTheHack = isLargeTablet || (isSmallTablet && hasLowDensityScreen);
+        if (DEBUG_MODE) {
+            final int sw = res.getConfiguration().smallestScreenWidthDp;
+            Log.d(TAG, "needsProximateBogusDownMoveUpEventHack=" + needsTheHack
+                    + " smallestScreenWidthDp=" + sw + " densityDpi=" + densityDpi
+                    + " screenMetrics=" + screenMetrics);
+        }
+        sNeedsProximateBogusDownMoveUpEventHack = needsTheHack;
+    }
+
+    private int mAccumulatedDistanceThreshold;
+    private int mRadiusThreshold;
+
+    // Accumulated distance from actual and artificial down keys.
+    /* package */ int mAccumulatedDistanceFromDownKey;
+    private int mActualDownX;
+    private int mActualDownY;
+
+    public void setKeyboardGeometry(final int keyWidth, final int keyHeight) {
+        final float keyDiagonal = (float)Math.hypot(keyWidth, keyHeight);
+        mAccumulatedDistanceThreshold = (int)(
+                keyDiagonal * BOGUS_MOVE_ACCUMULATED_DISTANCE_THRESHOLD);
+        mRadiusThreshold = (int)(keyDiagonal * BOGUS_MOVE_RADIUS_THRESHOLD);
+    }
+
+    public void onActualDownEvent(final int x, final int y) {
+        mActualDownX = x;
+        mActualDownY = y;
+    }
+
+    public void onDownKey() {
+        mAccumulatedDistanceFromDownKey = 0;
+    }
+
+    public void onMoveKey(final int distance) {
+        mAccumulatedDistanceFromDownKey += distance;
+    }
+
+    public boolean hasTraveledLongDistance(final int x, final int y) {
+        if (!sNeedsProximateBogusDownMoveUpEventHack) {
+            return false;
+        }
+        final int dx = Math.abs(x - mActualDownX);
+        final int dy = Math.abs(y - mActualDownY);
+        // A bogus move event should be a horizontal movement. A vertical movement might be
+        // a sloppy typing and should be ignored.
+        return dx >= dy && mAccumulatedDistanceFromDownKey >= mAccumulatedDistanceThreshold;
+    }
+
+    public int getAccumulatedDistanceFromDownKey() {
+        return mAccumulatedDistanceFromDownKey;
+    }
+
+    public int getDistanceFromDownEvent(final int x, final int y) {
+        return getDistance(x, y, mActualDownX, mActualDownY);
+    }
+
+    private static int getDistance(final int x1, final int y1, final int x2, final int y2) {
+        return (int)Math.hypot(x1 - x2, y1 - y2);
+    }
+
+    public boolean isCloseToActualDownEvent(final int x, final int y) {
+        return sNeedsProximateBogusDownMoveUpEventHack
+                && getDistanceFromDownEvent(x, y) < mRadiusThreshold;
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/CustomViewPager.java b/java/src/com/android/inputmethod/keyboard/internal/CustomViewPager.java
new file mode 100644
index 0000000..f5cc45c
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/CustomViewPager.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.content.Context;
+import android.support.v4.view.ViewPager;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.MotionEvent;
+
+/**
+ * Custom view pager to prevent {@link ViewPager} from crashing while handling multi-touch
+ * event.
+ */
+public class CustomViewPager extends ViewPager {
+    private static final String TAG = CustomViewPager.class.getSimpleName();
+
+    public CustomViewPager(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(final MotionEvent event) {
+        // This only happens when you multi-touch, take the first finger off and move.
+        // Unfortunately this causes {@link ViewPager} to crash, so we will ignore such events.
+        if (event.getAction() == MotionEvent.ACTION_MOVE && event.getPointerId(0) != 0) {
+            Log.w(TAG, "Ignored multi-touch move event to prevent ViewPager from crashing");
+            return false;
+        }
+
+        return super.onInterceptTouchEvent(event);
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/DrawingHandler.java b/java/src/com/android/inputmethod/keyboard/internal/DrawingHandler.java
new file mode 100644
index 0000000..df82bec
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/DrawingHandler.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.os.Message;
+
+import com.android.inputmethod.keyboard.Key;
+import com.android.inputmethod.keyboard.internal.DrawingHandler.Callbacks;
+import com.android.inputmethod.latin.SuggestedWords;
+import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
+
+// TODO: Separate this class into KeyPreviewHandler and BatchInputPreviewHandler or so.
+public class DrawingHandler extends LeakGuardHandlerWrapper<Callbacks> {
+    public interface Callbacks {
+        public void dismissKeyPreviewWithoutDelay(Key key);
+        public void dismissAllKeyPreviews();
+        public void showGestureFloatingPreviewText(SuggestedWords suggestedWords);
+    }
+
+    private static final int MSG_DISMISS_KEY_PREVIEW = 0;
+    private static final int MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
+
+    public DrawingHandler(final Callbacks ownerInstance) {
+        super(ownerInstance);
+    }
+
+    @Override
+    public void handleMessage(final Message msg) {
+        final Callbacks callbacks = getOwnerInstance();
+        if (callbacks == null) {
+            return;
+        }
+        switch (msg.what) {
+        case MSG_DISMISS_KEY_PREVIEW:
+            callbacks.dismissKeyPreviewWithoutDelay((Key)msg.obj);
+            break;
+        case MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT:
+            callbacks.showGestureFloatingPreviewText(SuggestedWords.EMPTY);
+            break;
+        }
+    }
+
+    public void dismissKeyPreview(final long delay, final Key key) {
+        sendMessageDelayed(obtainMessage(MSG_DISMISS_KEY_PREVIEW, key), delay);
+    }
+
+    private void cancelAllDismissKeyPreviews() {
+        removeMessages(MSG_DISMISS_KEY_PREVIEW);
+        final Callbacks callbacks = getOwnerInstance();
+        if (callbacks == null) {
+            return;
+        }
+        callbacks.dismissAllKeyPreviews();
+    }
+
+    public void dismissGestureFloatingPreviewText(final long delay) {
+        sendMessageDelayed(obtainMessage(MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT), delay);
+    }
+
+    public void cancelAllMessages() {
+        cancelAllDismissKeyPreviews();
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/PreviewPlacerView.java b/java/src/com/android/inputmethod/keyboard/internal/DrawingPreviewPlacerView.java
similarity index 90%
rename from java/src/com/android/inputmethod/keyboard/internal/PreviewPlacerView.java
rename to java/src/com/android/inputmethod/keyboard/internal/DrawingPreviewPlacerView.java
index 4c8607d..606addc 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/PreviewPlacerView.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/DrawingPreviewPlacerView.java
@@ -29,12 +29,12 @@
 
 import java.util.ArrayList;
 
-public final class PreviewPlacerView extends RelativeLayout {
+public final class DrawingPreviewPlacerView extends RelativeLayout {
     private final int[] mKeyboardViewOrigin = CoordinateUtils.newInstance();
 
     private final ArrayList<AbstractDrawingPreview> mPreviews = CollectionUtils.newArrayList();
 
-    public PreviewPlacerView(final Context context, final AttributeSet attrs) {
+    public DrawingPreviewPlacerView(final Context context, final AttributeSet attrs) {
         super(context, attrs);
         setWillNotDraw(false);
     }
@@ -59,13 +59,17 @@
         }
     }
 
+    public void deallocateMemory() {
+        final int count = mPreviews.size();
+        for (int i = 0; i < count; i++) {
+            mPreviews.get(i).onDeallocateMemory();
+        }
+    }
+
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
-        final int count = mPreviews.size();
-        for (int i = 0; i < count; i++) {
-            mPreviews.get(i).onDetachFromWindow();
-        }
+        deallocateMemory();
     }
 
     @Override
diff --git a/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java b/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
index 3133e54..e2fd390 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
@@ -25,7 +25,7 @@
 import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.latin.settings.Settings;
 import com.android.inputmethod.latin.utils.CollectionUtils;
-import com.android.inputmethod.latin.utils.StringUtils;
+import com.android.inputmethod.latin.utils.JsonUtils;
 
 import java.util.ArrayDeque;
 import java.util.ArrayList;
@@ -53,7 +53,7 @@
     private Key[] mCachedGridKeys;
 
     public DynamicGridKeyboard(final SharedPreferences prefs, final Keyboard templateKeyboard,
-            final int maxKeyCount, final int categoryId, final int categoryPageId) {
+            final int maxKeyCount, final int categoryId) {
         super(templateKeyboard);
         final Key key0 = getTemplateKey(TEMPLATE_KEY_CODE_0);
         final Key key1 = getTemplateKey(TEMPLATE_KEY_CODE_1);
@@ -124,7 +124,7 @@
                 final int keyY0 = getKeyY0(index);
                 final int keyX1 = getKeyX1(index);
                 final int keyY1 = getKeyY1(index);
-                gridKey.updateCorrdinates(keyX0, keyY0, keyX1, keyY1);
+                gridKey.updateCoordinates(keyX0, keyY0, keyX1, keyY1);
                 index++;
             }
         }
@@ -139,36 +139,48 @@
                 keys.add(key.getCode());
             }
         }
-        final String jsonStr = StringUtils.listToJsonStr(keys);
+        final String jsonStr = JsonUtils.listToJsonStr(keys);
         Settings.writeEmojiRecentKeys(mPrefs, jsonStr);
     }
 
-    private static Key getKey(final Collection<DynamicGridKeyboard> keyboards, final Object o) {
-        for (final DynamicGridKeyboard kbd : keyboards) {
-            if (o instanceof Integer) {
-                final int code = (Integer) o;
-                final Key key = kbd.getKey(code);
-                if (key != null) {
-                    return key;
-                }
-            } else if (o instanceof String) {
-                final String outputText = (String) o;
-                final Key key = kbd.getKeyFromOutputText(outputText);
-                if (key != null) {
-                    return key;
-                }
-            } else {
-                Log.w(TAG, "Invalid object: " + o);
+    private static Key getKeyByCode(final Collection<DynamicGridKeyboard> keyboards,
+            final int code) {
+        for (final DynamicGridKeyboard keyboard : keyboards) {
+            final Key key = keyboard.getKey(code);
+            if (key != null) {
+                return key;
             }
         }
         return null;
     }
 
-    public void loadRecentKeys(Collection<DynamicGridKeyboard> keyboards) {
+    private static Key getKeyByOutputText(final Collection<DynamicGridKeyboard> keyboards,
+            final String outputText) {
+        for (final DynamicGridKeyboard kbd : keyboards) {
+            final Key key = kbd.getKeyFromOutputText(outputText);
+            if (key != null) {
+                return key;
+            }
+        }
+        return null;
+    }
+
+    public void loadRecentKeys(final Collection<DynamicGridKeyboard> keyboards) {
         final String str = Settings.readEmojiRecentKeys(mPrefs);
-        final List<Object> keys = StringUtils.jsonStrToList(str);
+        final List<Object> keys = JsonUtils.jsonStrToList(str);
         for (final Object o : keys) {
-            addKeyLast(getKey(keyboards, o));
+            final Key key;
+            if (o instanceof Integer) {
+                final int code = (Integer)o;
+                key = getKeyByCode(keyboards, code);
+            } else if (o instanceof String) {
+                final String outputText = (String)o;
+                key = getKeyByOutputText(keyboards, outputText);
+            } else {
+                Log.w(TAG, "Invalid object: " + o);
+                continue;
+            }
+            addKeyLast(key);
         }
     }
 
@@ -217,7 +229,7 @@
             super(originalKey);
         }
 
-        public void updateCorrdinates(final int x0, final int y0, final int x1, final int y1) {
+        public void updateCoordinates(final int x0, final int y0, final int x1, final int y1) {
             mCurrentX = x0;
             mCurrentY = y0;
             getHitBox().set(x0, y0, x1, y1);
diff --git a/java/src/com/android/inputmethod/keyboard/EmojiLayoutParams.java b/java/src/com/android/inputmethod/keyboard/internal/EmojiLayoutParams.java
similarity index 72%
rename from java/src/com/android/inputmethod/keyboard/EmojiLayoutParams.java
rename to java/src/com/android/inputmethod/keyboard/internal/EmojiLayoutParams.java
index 967448c..12e0632 100644
--- a/java/src/com/android/inputmethod/keyboard/EmojiLayoutParams.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/EmojiLayoutParams.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.inputmethod.keyboard;
+package com.android.inputmethod.keyboard.internal;
 
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.utils.ResourceUtils;
@@ -37,22 +37,22 @@
     private final int mBottomPadding;
     private final int mTopPadding;
 
-    public EmojiLayoutParams(Resources res) {
+    public EmojiLayoutParams(final Resources res) {
         final int defaultKeyboardHeight = ResourceUtils.getDefaultKeyboardHeight(res);
         final int defaultKeyboardWidth = ResourceUtils.getDefaultKeyboardWidth(res);
-        mKeyVerticalGap = (int) res.getFraction(R.fraction.key_bottom_gap_holo,
-                (int) defaultKeyboardHeight, (int) defaultKeyboardHeight);
-        mBottomPadding = (int) res.getFraction(R.fraction.keyboard_bottom_padding_holo,
-                (int) defaultKeyboardHeight, (int) defaultKeyboardHeight);
-        mTopPadding = (int) res.getFraction(R.fraction.keyboard_top_padding_holo,
-                (int) defaultKeyboardHeight, (int) defaultKeyboardHeight);
-        mKeyHorizontalGap = (int) (res.getFraction(R.fraction.key_horizontal_gap_holo,
+        mKeyVerticalGap = (int) res.getFraction(R.fraction.config_key_vertical_gap_holo,
+                defaultKeyboardHeight, defaultKeyboardHeight);
+        mBottomPadding = (int) res.getFraction(R.fraction.config_keyboard_bottom_padding_holo,
+                defaultKeyboardHeight, defaultKeyboardHeight);
+        mTopPadding = (int) res.getFraction(R.fraction.config_keyboard_top_padding_holo,
+                defaultKeyboardHeight, defaultKeyboardHeight);
+        mKeyHorizontalGap = (int) (res.getFraction(R.fraction.config_key_horizontal_gap_holo,
                 defaultKeyboardWidth, defaultKeyboardWidth));
         mEmojiCategoryPageIdViewHeight =
-                (int) (res.getDimension(R.dimen.emoji_category_page_id_height));
+                (int) (res.getDimension(R.dimen.config_emoji_category_page_id_height));
         final int baseheight = defaultKeyboardHeight - mBottomPadding - mTopPadding
                 + mKeyVerticalGap;
-        mEmojiActionBarHeight = ((int) baseheight) / DEFAULT_KEYBOARD_ROWS
+        mEmojiActionBarHeight = baseheight / DEFAULT_KEYBOARD_ROWS
                 - (mKeyVerticalGap - mBottomPadding) / 2;
         mEmojiPagerHeight = defaultKeyboardHeight - mEmojiActionBarHeight
                 - mEmojiCategoryPageIdViewHeight;
@@ -60,26 +60,26 @@
         mEmojiKeyboardHeight = mEmojiPagerHeight - mEmojiPagerBottomMargin - 1;
     }
 
-    public void setPagerProperties(ViewPager vp) {
+    public void setPagerProperties(final ViewPager vp) {
         final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) vp.getLayoutParams();
         lp.height = mEmojiKeyboardHeight;
         lp.bottomMargin = mEmojiPagerBottomMargin;
         vp.setLayoutParams(lp);
     }
 
-    public void setCategoryPageIdViewProperties(LinearLayout ll) {
+    public void setCategoryPageIdViewProperties(final LinearLayout ll) {
         final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) ll.getLayoutParams();
         lp.height = mEmojiCategoryPageIdViewHeight;
         ll.setLayoutParams(lp);
     }
 
-    public void setActionBarProperties(LinearLayout ll) {
+    public void setActionBarProperties(final LinearLayout ll) {
         final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) ll.getLayoutParams();
         lp.height = mEmojiActionBarHeight - mBottomPadding;
         ll.setLayoutParams(lp);
     }
 
-    public void setKeyProperties(ImageView ib) {
+    public void setKeyProperties(final ImageView ib) {
         final LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) ib.getLayoutParams();
         lp.leftMargin = mKeyHorizontalGap / 2;
         lp.rightMargin = mKeyHorizontalGap / 2;
diff --git a/java/src/com/android/inputmethod/keyboard/internal/ScrollKeyboardView.java b/java/src/com/android/inputmethod/keyboard/internal/EmojiPageKeyboardView.java
similarity index 63%
rename from java/src/com/android/inputmethod/keyboard/internal/ScrollKeyboardView.java
rename to java/src/com/android/inputmethod/keyboard/internal/EmojiPageKeyboardView.java
index 9cf68d4..2e80f79 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/ScrollKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/EmojiPageKeyboardView.java
@@ -20,25 +20,21 @@
 import android.util.AttributeSet;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
-import android.widget.ScrollView;
-import android.widget.Scroller;
 
 import com.android.inputmethod.keyboard.Key;
 import com.android.inputmethod.keyboard.KeyDetector;
 import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.keyboard.KeyboardView;
+import com.android.inputmethod.keyboard.PointerTracker;
 import com.android.inputmethod.latin.R;
 
 /**
- * This is an extended {@link KeyboardView} class that hosts a vertical scroll keyboard.
+ * This is an extended {@link KeyboardView} class that hosts an emoji page keyboard.
  * Multi-touch unsupported. No {@link PointerTracker}s. No gesture support.
- * TODO: Vertical scroll capability should be removed from this class because it's no longer used.
  */
 // TODO: Implement key popup preview.
-public final class ScrollKeyboardView extends KeyboardView implements
-        ScrollViewWithNotifier.ScrollListener, GestureDetector.OnGestureListener {
-    private static final boolean PAGINATION = false;
-
+public final class EmojiPageKeyboardView extends KeyboardView implements
+        GestureDetector.OnGestureListener {
     public interface OnKeyClickListener {
         public void onKeyClick(Key key);
     }
@@ -52,63 +48,15 @@
     private final KeyDetector mKeyDetector = new KeyDetector(0.0f /*keyHysteresisDistance */);
     private final GestureDetector mGestureDetector;
 
-    private final Scroller mScroller;
-    private ScrollViewWithNotifier mScrollView;
-
-    public ScrollKeyboardView(final Context context, final AttributeSet attrs) {
+    public EmojiPageKeyboardView(final Context context, final AttributeSet attrs) {
         this(context, attrs, R.attr.keyboardViewStyle);
     }
 
-    public ScrollKeyboardView(final Context context, final AttributeSet attrs, final int defStyle) {
+    public EmojiPageKeyboardView(final Context context, final AttributeSet attrs,
+            final int defStyle) {
         super(context, attrs, defStyle);
         mGestureDetector = new GestureDetector(context, this);
         mGestureDetector.setIsLongpressEnabled(false /* isLongpressEnabled */);
-        mScroller = new Scroller(context);
-    }
-
-    public void setScrollView(final ScrollViewWithNotifier scrollView) {
-        mScrollView = scrollView;
-        scrollView.setScrollListener(this);
-    }
-
-    private final Runnable mScrollTask = new Runnable() {
-        @Override
-        public void run() {
-            final Scroller scroller = mScroller;
-            final ScrollView scrollView = mScrollView;
-            scroller.computeScrollOffset();
-            scrollView.scrollTo(0, scroller.getCurrY());
-            if (!scroller.isFinished()) {
-                scrollView.post(this);
-            }
-        }
-    };
-
-    // {@link ScrollViewWithNotified#ScrollListener} methods.
-    @Override
-    public void notifyScrollChanged(final int scrollX, final int scrollY, final int oldX,
-            final int oldY) {
-        if (PAGINATION) {
-            mScroller.forceFinished(true /* finished */);
-            mScrollView.removeCallbacks(mScrollTask);
-            final int currentTop = mScrollView.getScrollY();
-            final int pageHeight = getKeyboard().mBaseHeight;
-            final int lastPageNo = currentTop / pageHeight;
-            final int lastPageTop = lastPageNo * pageHeight;
-            final int nextPageNo = lastPageNo + 1;
-            final int nextPageTop = Math.min(nextPageNo * pageHeight, getHeight() - pageHeight);
-            final int scrollTo = (currentTop - lastPageTop) < (nextPageTop - currentTop)
-                    ? lastPageTop : nextPageTop;
-            final int deltaY = scrollTo - currentTop;
-            mScroller.startScroll(0, currentTop, 0, deltaY, 300);
-            mScrollView.post(mScrollTask);
-        }
-    }
-
-    @Override
-    public void notifyOverScrolled(final int scrollX, final int scrollY, final boolean clampedX,
-            final boolean clampedY) {
-        releaseCurrentKey();
     }
 
     public void setOnKeyClickListener(final OnKeyClickListener listener) {
@@ -139,7 +87,7 @@
         return true;
     }
 
-    // {@link GestureDetector#OnGestureListener} methods.
+    // {@link GestureEnabler#OnGestureListener} methods.
     private Key mCurrentKey;
 
     private Key getKey(final MotionEvent e) {
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureEnabler.java b/java/src/com/android/inputmethod/keyboard/internal/GestureEnabler.java
new file mode 100644
index 0000000..7d14ae9
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureEnabler.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import com.android.inputmethod.accessibility.AccessibilityUtils;
+
+public final class GestureEnabler {
+    /** True if we should handle gesture events. */
+    private boolean mShouldHandleGesture;
+    private boolean mMainDictionaryAvailable;
+    private boolean mGestureHandlingEnabledByInputField;
+    private boolean mGestureHandlingEnabledByUser;
+
+    private void updateGestureHandlingMode() {
+        mShouldHandleGesture = mMainDictionaryAvailable
+                && mGestureHandlingEnabledByInputField
+                && mGestureHandlingEnabledByUser
+                && !AccessibilityUtils.getInstance().isTouchExplorationEnabled();
+    }
+
+    // Note that this method is called from a non-UI thread.
+    public void setMainDictionaryAvailability(final boolean mainDictionaryAvailable) {
+        mMainDictionaryAvailable = mainDictionaryAvailable;
+        updateGestureHandlingMode();
+    }
+
+    public void setGestureHandlingEnabledByUser(final boolean gestureHandlingEnabledByUser) {
+        mGestureHandlingEnabledByUser = gestureHandlingEnabledByUser;
+        updateGestureHandlingMode();
+    }
+
+    public void setPasswordMode(final boolean passwordMode) {
+        mGestureHandlingEnabledByInputField = !passwordMode;
+        updateGestureHandlingMode();
+    }
+
+    public boolean shouldHandleGesture() {
+        return mShouldHandleGesture;
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureFloatingPreviewText.java b/java/src/com/android/inputmethod/keyboard/internal/GestureFloatingTextDrawingPreview.java
similarity index 96%
rename from java/src/com/android/inputmethod/keyboard/internal/GestureFloatingPreviewText.java
rename to java/src/com/android/inputmethod/keyboard/internal/GestureFloatingTextDrawingPreview.java
index c6dd9e1..2fa7030 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/GestureFloatingPreviewText.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureFloatingTextDrawingPreview.java
@@ -42,7 +42,7 @@
  * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewVerticalPadding
  * @attr ref R.styleable#KeyboardView_gestureFloatingPreviewRoundRadius
  */
-public class GestureFloatingPreviewText extends AbstractDrawingPreview {
+public class GestureFloatingTextDrawingPreview extends AbstractDrawingPreview {
     protected static final class GesturePreviewTextParams {
         public final int mGesturePreviewTextOffset;
         public final int mGesturePreviewTextHeight;
@@ -100,11 +100,16 @@
     private SuggestedWords mSuggestedWords = SuggestedWords.EMPTY;
     private final int[] mLastPointerCoords = CoordinateUtils.newInstance();
 
-    public GestureFloatingPreviewText(final View drawingView, final TypedArray typedArray) {
+    public GestureFloatingTextDrawingPreview(final View drawingView, final TypedArray typedArray) {
         super(drawingView);
         mParams = new GesturePreviewTextParams(typedArray);
     }
 
+    @Override
+    public void onDeallocateMemory() {
+        // Nothing to do here.
+    }
+
     public void setSuggetedWords(final SuggestedWords suggestedWords) {
         if (!isPreviewEnabled()) {
             return;
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureStroke.java b/java/src/com/android/inputmethod/keyboard/internal/GestureStroke.java
deleted file mode 100644
index f29ade8..0000000
--- a/java/src/com/android/inputmethod/keyboard/internal/GestureStroke.java
+++ /dev/null
@@ -1,390 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.keyboard.internal;
-
-import android.content.res.TypedArray;
-import android.util.Log;
-
-import com.android.inputmethod.latin.InputPointers;
-import com.android.inputmethod.latin.R;
-import com.android.inputmethod.latin.utils.ResizableIntArray;
-import com.android.inputmethod.latin.utils.ResourceUtils;
-
-public class GestureStroke {
-    private static final String TAG = GestureStroke.class.getSimpleName();
-    private static final boolean DEBUG = false;
-    private static final boolean DEBUG_SPEED = false;
-
-    // The height of extra area above the keyboard to draw gesture trails.
-    // Proportional to the keyboard height.
-    public static final float EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO = 0.25f;
-
-    public static final int DEFAULT_CAPACITY = 128;
-
-    private final int mPointerId;
-    private final ResizableIntArray mEventTimes = new ResizableIntArray(DEFAULT_CAPACITY);
-    private final ResizableIntArray mXCoordinates = new ResizableIntArray(DEFAULT_CAPACITY);
-    private final ResizableIntArray mYCoordinates = new ResizableIntArray(DEFAULT_CAPACITY);
-
-    private final GestureStrokeParams mParams;
-
-    private int mKeyWidth; // pixel
-    private int mMinYCoordinate; // pixel
-    private int mMaxYCoordinate; // pixel
-    // Static threshold for starting gesture detection
-    private int mDetectFastMoveSpeedThreshold; // pixel /sec
-    private int mDetectFastMoveTime;
-    private int mDetectFastMoveX;
-    private int mDetectFastMoveY;
-    // Dynamic threshold for gesture after fast typing
-    private boolean mAfterFastTyping;
-    private int mGestureDynamicDistanceThresholdFrom; // pixel
-    private int mGestureDynamicDistanceThresholdTo; // pixel
-    // Variables for gesture sampling
-    private int mGestureSamplingMinimumDistance; // pixel
-    private long mLastMajorEventTime;
-    private int mLastMajorEventX;
-    private int mLastMajorEventY;
-    // Variables for gesture recognition
-    private int mGestureRecognitionSpeedThreshold; // pixel / sec
-    private int mIncrementalRecognitionSize;
-    private int mLastIncrementalBatchSize;
-
-    public static final class GestureStrokeParams {
-        // Static threshold for gesture after fast typing
-        public final int mStaticTimeThresholdAfterFastTyping; // msec
-        // Static threshold for starting gesture detection
-        public final float mDetectFastMoveSpeedThreshold; // keyWidth/sec
-        // Dynamic threshold for gesture after fast typing
-        public final int mDynamicThresholdDecayDuration; // msec
-        // Time based threshold values
-        public final int mDynamicTimeThresholdFrom; // msec
-        public final int mDynamicTimeThresholdTo; // msec
-        // Distance based threshold values
-        public final float mDynamicDistanceThresholdFrom; // keyWidth
-        public final float mDynamicDistanceThresholdTo; // keyWidth
-        // Parameters for gesture sampling
-        public final float mSamplingMinimumDistance; // keyWidth
-        // Parameters for gesture recognition
-        public final int mRecognitionMinimumTime; // msec
-        public final float mRecognitionSpeedThreshold; // keyWidth/sec
-
-        // Default GestureStroke parameters.
-        public static final GestureStrokeParams DEFAULT = new GestureStrokeParams();
-
-        private GestureStrokeParams() {
-            // These parameter values are default and intended for testing.
-            mStaticTimeThresholdAfterFastTyping = 350; // msec
-            mDetectFastMoveSpeedThreshold = 1.5f; // keyWidth / sec
-            mDynamicThresholdDecayDuration = 450; // msec
-            mDynamicTimeThresholdFrom = 300; // msec
-            mDynamicTimeThresholdTo = 20; // msec
-            mDynamicDistanceThresholdFrom = 6.0f; // keyWidth
-            mDynamicDistanceThresholdTo = 0.35f; // keyWidth
-            // The following parameters' change will affect the result of regression test.
-            mSamplingMinimumDistance = 1.0f / 6.0f; // keyWidth
-            mRecognitionMinimumTime = 100; // msec
-            mRecognitionSpeedThreshold = 5.5f; // keyWidth / sec
-        }
-
-        public GestureStrokeParams(final TypedArray mainKeyboardViewAttr) {
-            mStaticTimeThresholdAfterFastTyping = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureStaticTimeThresholdAfterFastTyping,
-                    DEFAULT.mStaticTimeThresholdAfterFastTyping);
-            mDetectFastMoveSpeedThreshold = ResourceUtils.getFraction(mainKeyboardViewAttr,
-                    R.styleable.MainKeyboardView_gestureDetectFastMoveSpeedThreshold,
-                    DEFAULT.mDetectFastMoveSpeedThreshold);
-            mDynamicThresholdDecayDuration = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureDynamicThresholdDecayDuration,
-                    DEFAULT.mDynamicThresholdDecayDuration);
-            mDynamicTimeThresholdFrom = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureDynamicTimeThresholdFrom,
-                    DEFAULT.mDynamicTimeThresholdFrom);
-            mDynamicTimeThresholdTo = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureDynamicTimeThresholdTo,
-                    DEFAULT.mDynamicTimeThresholdTo);
-            mDynamicDistanceThresholdFrom = ResourceUtils.getFraction(mainKeyboardViewAttr,
-                    R.styleable.MainKeyboardView_gestureDynamicDistanceThresholdFrom,
-                    DEFAULT.mDynamicDistanceThresholdFrom);
-            mDynamicDistanceThresholdTo = ResourceUtils.getFraction(mainKeyboardViewAttr,
-                    R.styleable.MainKeyboardView_gestureDynamicDistanceThresholdTo,
-                    DEFAULT.mDynamicDistanceThresholdTo);
-            mSamplingMinimumDistance = ResourceUtils.getFraction(mainKeyboardViewAttr,
-                    R.styleable.MainKeyboardView_gestureSamplingMinimumDistance,
-                    DEFAULT.mSamplingMinimumDistance);
-            mRecognitionMinimumTime = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureRecognitionMinimumTime,
-                    DEFAULT.mRecognitionMinimumTime);
-            mRecognitionSpeedThreshold = ResourceUtils.getFraction(mainKeyboardViewAttr,
-                    R.styleable.MainKeyboardView_gestureRecognitionSpeedThreshold,
-                    DEFAULT.mRecognitionSpeedThreshold);
-        }
-    }
-
-    private static final int MSEC_PER_SEC = 1000;
-
-    public GestureStroke(final int pointerId, final GestureStrokeParams params) {
-        mPointerId = pointerId;
-        mParams = params;
-    }
-
-    public void setKeyboardGeometry(final int keyWidth, final int keyboardHeight) {
-        mKeyWidth = keyWidth;
-        mMinYCoordinate = -(int)(keyboardHeight * EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO);
-        mMaxYCoordinate = keyboardHeight;
-        // TODO: Find an appropriate base metric for these length. Maybe diagonal length of the key?
-        mDetectFastMoveSpeedThreshold = (int)(keyWidth * mParams.mDetectFastMoveSpeedThreshold);
-        mGestureDynamicDistanceThresholdFrom =
-                (int)(keyWidth * mParams.mDynamicDistanceThresholdFrom);
-        mGestureDynamicDistanceThresholdTo = (int)(keyWidth * mParams.mDynamicDistanceThresholdTo);
-        mGestureSamplingMinimumDistance = (int)(keyWidth * mParams.mSamplingMinimumDistance);
-        mGestureRecognitionSpeedThreshold = (int)(keyWidth * mParams.mRecognitionSpeedThreshold);
-        if (DEBUG) {
-            Log.d(TAG, String.format(
-                    "[%d] setKeyboardGeometry: keyWidth=%3d tT=%3d >> %3d tD=%3d >> %3d",
-                    mPointerId, keyWidth,
-                    mParams.mDynamicTimeThresholdFrom,
-                    mParams.mDynamicTimeThresholdTo,
-                    mGestureDynamicDistanceThresholdFrom,
-                    mGestureDynamicDistanceThresholdTo));
-        }
-    }
-
-    public int getLength() {
-        return mEventTimes.getLength();
-    }
-
-    public void onDownEvent(final int x, final int y, final long downTime,
-            final long gestureFirstDownTime, final long lastTypingTime) {
-        reset();
-        final long elapsedTimeAfterTyping = downTime - lastTypingTime;
-        if (elapsedTimeAfterTyping < mParams.mStaticTimeThresholdAfterFastTyping) {
-            mAfterFastTyping = true;
-        }
-        if (DEBUG) {
-            Log.d(TAG, String.format("[%d] onDownEvent: dT=%3d%s", mPointerId,
-                    elapsedTimeAfterTyping, mAfterFastTyping ? " afterFastTyping" : ""));
-        }
-        final int elapsedTimeFromFirstDown = (int)(downTime - gestureFirstDownTime);
-        addPointOnKeyboard(x, y, elapsedTimeFromFirstDown, true /* isMajorEvent */);
-    }
-
-    private int getGestureDynamicDistanceThreshold(final int deltaTime) {
-        if (!mAfterFastTyping || deltaTime >= mParams.mDynamicThresholdDecayDuration) {
-            return mGestureDynamicDistanceThresholdTo;
-        }
-        final int decayedThreshold =
-                (mGestureDynamicDistanceThresholdFrom - mGestureDynamicDistanceThresholdTo)
-                * deltaTime / mParams.mDynamicThresholdDecayDuration;
-        return mGestureDynamicDistanceThresholdFrom - decayedThreshold;
-    }
-
-    private int getGestureDynamicTimeThreshold(final int deltaTime) {
-        if (!mAfterFastTyping || deltaTime >= mParams.mDynamicThresholdDecayDuration) {
-            return mParams.mDynamicTimeThresholdTo;
-        }
-        final int decayedThreshold =
-                (mParams.mDynamicTimeThresholdFrom - mParams.mDynamicTimeThresholdTo)
-                * deltaTime / mParams.mDynamicThresholdDecayDuration;
-        return mParams.mDynamicTimeThresholdFrom - decayedThreshold;
-    }
-
-    public final boolean isStartOfAGesture() {
-        if (!hasDetectedFastMove()) {
-            return false;
-        }
-        final int size = getLength();
-        if (size <= 0) {
-            return false;
-        }
-        final int lastIndex = size - 1;
-        final int deltaTime = mEventTimes.get(lastIndex) - mDetectFastMoveTime;
-        if (deltaTime < 0) {
-            return false;
-        }
-        final int deltaDistance = getDistance(
-                mXCoordinates.get(lastIndex), mYCoordinates.get(lastIndex),
-                mDetectFastMoveX, mDetectFastMoveY);
-        final int distanceThreshold = getGestureDynamicDistanceThreshold(deltaTime);
-        final int timeThreshold = getGestureDynamicTimeThreshold(deltaTime);
-        final boolean isStartOfAGesture = deltaTime >= timeThreshold
-                && deltaDistance >= distanceThreshold;
-        if (DEBUG) {
-            Log.d(TAG, String.format("[%d] isStartOfAGesture: dT=%3d tT=%3d dD=%3d tD=%3d%s%s",
-                    mPointerId, deltaTime, timeThreshold,
-                    deltaDistance, distanceThreshold,
-                    mAfterFastTyping ? " afterFastTyping" : "",
-                    isStartOfAGesture ? " startOfAGesture" : ""));
-        }
-        return isStartOfAGesture;
-    }
-
-    public void duplicateLastPointWith(final int time) {
-        final int lastIndex = getLength() - 1;
-        if (lastIndex >= 0) {
-            final int x = mXCoordinates.get(lastIndex);
-            final int y = mYCoordinates.get(lastIndex);
-            if (DEBUG) {
-                Log.d(TAG, String.format("[%d] duplicateLastPointWith: %d,%d|%d", mPointerId,
-                        x, y, time));
-            }
-            // TODO: Have appendMajorPoint()
-            appendPoint(x, y, time);
-            updateIncrementalRecognitionSize(x, y, time);
-        }
-    }
-
-    protected void reset() {
-        mIncrementalRecognitionSize = 0;
-        mLastIncrementalBatchSize = 0;
-        mEventTimes.setLength(0);
-        mXCoordinates.setLength(0);
-        mYCoordinates.setLength(0);
-        mLastMajorEventTime = 0;
-        mDetectFastMoveTime = 0;
-        mAfterFastTyping = false;
-    }
-
-    private void appendPoint(final int x, final int y, final int time) {
-        final int lastIndex = getLength() - 1;
-        // The point that is created by {@link duplicateLastPointWith(int)} may have later event
-        // time than the next {@link MotionEvent}. To maintain the monotonicity of the event time,
-        // drop the successive point here.
-        if (lastIndex >= 0 && mEventTimes.get(lastIndex) > time) {
-            Log.w(TAG, String.format("[%d] drop stale event: %d,%d|%d last: %d,%d|%d", mPointerId,
-                    x, y, time, mXCoordinates.get(lastIndex), mYCoordinates.get(lastIndex),
-                    mEventTimes.get(lastIndex)));
-            return;
-        }
-        mEventTimes.add(time);
-        mXCoordinates.add(x);
-        mYCoordinates.add(y);
-    }
-
-    private void updateMajorEvent(final int x, final int y, final int time) {
-        mLastMajorEventTime = time;
-        mLastMajorEventX = x;
-        mLastMajorEventY = y;
-    }
-
-    private final boolean hasDetectedFastMove() {
-        return mDetectFastMoveTime > 0;
-    }
-
-    private int detectFastMove(final int x, final int y, final int time) {
-        final int size = getLength();
-        final int lastIndex = size - 1;
-        final int lastX = mXCoordinates.get(lastIndex);
-        final int lastY = mYCoordinates.get(lastIndex);
-        final int dist = getDistance(lastX, lastY, x, y);
-        final int msecs = time - mEventTimes.get(lastIndex);
-        if (msecs > 0) {
-            final int pixels = getDistance(lastX, lastY, x, y);
-            final int pixelsPerSec = pixels * MSEC_PER_SEC;
-            if (DEBUG_SPEED) {
-                final float speed = (float)pixelsPerSec / msecs / mKeyWidth;
-                Log.d(TAG, String.format("[%d] detectFastMove: speed=%5.2f", mPointerId, speed));
-            }
-            // Equivalent to (pixels / msecs < mStartSpeedThreshold / MSEC_PER_SEC)
-            if (!hasDetectedFastMove() && pixelsPerSec > mDetectFastMoveSpeedThreshold * msecs) {
-                if (DEBUG) {
-                    final float speed = (float)pixelsPerSec / msecs / mKeyWidth;
-                    Log.d(TAG, String.format(
-                            "[%d] detectFastMove: speed=%5.2f T=%3d points=%3d fastMove",
-                            mPointerId, speed, time, size));
-                }
-                mDetectFastMoveTime = time;
-                mDetectFastMoveX = x;
-                mDetectFastMoveY = y;
-            }
-        }
-        return dist;
-    }
-
-    /**
-     * Add a touch event as a gesture point. Returns true if the touch event is on the valid
-     * gesture area.
-     * @param x the x-coordinate of the touch event
-     * @param y the y-coordinate of the touch event
-     * @param time the elapsed time in millisecond from the first gesture down
-     * @param isMajorEvent false if this is a historical move event
-     * @return true if the touch event is on the valid gesture area
-     */
-    public boolean addPointOnKeyboard(final int x, final int y, final int time,
-            final boolean isMajorEvent) {
-        final int size = getLength();
-        if (size <= 0) {
-            // Down event
-            appendPoint(x, y, time);
-            updateMajorEvent(x, y, time);
-        } else {
-            final int distance = detectFastMove(x, y, time);
-            if (distance > mGestureSamplingMinimumDistance) {
-                appendPoint(x, y, time);
-            }
-        }
-        if (isMajorEvent) {
-            updateIncrementalRecognitionSize(x, y, time);
-            updateMajorEvent(x, y, time);
-        }
-        return y >= mMinYCoordinate && y < mMaxYCoordinate;
-    }
-
-    private void updateIncrementalRecognitionSize(final int x, final int y, final int time) {
-        final int msecs = (int)(time - mLastMajorEventTime);
-        if (msecs <= 0) {
-            return;
-        }
-        final int pixels = getDistance(mLastMajorEventX, mLastMajorEventY, x, y);
-        final int pixelsPerSec = pixels * MSEC_PER_SEC;
-        // Equivalent to (pixels / msecs < mGestureRecognitionThreshold / MSEC_PER_SEC)
-        if (pixelsPerSec < mGestureRecognitionSpeedThreshold * msecs) {
-            mIncrementalRecognitionSize = getLength();
-        }
-    }
-
-    public final boolean hasRecognitionTimePast(
-            final long currentTime, final long lastRecognitionTime) {
-        return currentTime > lastRecognitionTime + mParams.mRecognitionMinimumTime;
-    }
-
-    public final void appendAllBatchPoints(final InputPointers out) {
-        appendBatchPoints(out, getLength());
-    }
-
-    public final void appendIncrementalBatchPoints(final InputPointers out) {
-        appendBatchPoints(out, mIncrementalRecognitionSize);
-    }
-
-    private void appendBatchPoints(final InputPointers out, final int size) {
-        final int length = size - mLastIncrementalBatchSize;
-        if (length <= 0) {
-            return;
-        }
-        out.append(mPointerId, mEventTimes, mXCoordinates, mYCoordinates,
-                mLastIncrementalBatchSize, length);
-        mLastIncrementalBatchSize = size;
-    }
-
-    private static int getDistance(final int x1, final int y1, final int x2, final int y2) {
-        final int dx = x1 - x2;
-        final int dy = y1 - y2;
-        // Note that, in recent versions of Android, FloatMath is actually slower than
-        // java.lang.Math due to the way the JIT optimizes java.lang.Math.
-        return (int)Math.sqrt(dx * dx + dy * dy);
-    }
-}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeDrawingParams.java b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeDrawingParams.java
new file mode 100644
index 0000000..478639d
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeDrawingParams.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.content.res.TypedArray;
+
+import com.android.inputmethod.latin.R;
+
+/**
+ * This class holds parameters to control how a gesture stroke is sampled and drawn on the screen.
+ *
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailMinSamplingDistance
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailMaxInterpolationAngularThreshold
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailMaxInterpolationDistanceThreshold
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailMaxInterpolationSegments
+ */
+public final class GestureStrokeDrawingParams {
+    public final double mMinSamplingDistance; // in pixel
+    public final double mMaxInterpolationAngularThreshold; // in radian
+    public final double mMaxInterpolationDistanceThreshold; // in pixel
+    public final int mMaxInterpolationSegments;
+
+    private static final float DEFAULT_MIN_SAMPLING_DISTANCE = 0.0f; // dp
+    private static final int DEFAULT_MAX_INTERPOLATION_ANGULAR_THRESHOLD = 15; // in degree
+    private static final float DEFAULT_MAX_INTERPOLATION_DISTANCE_THRESHOLD = 0.0f; // dp
+    private static final int DEFAULT_MAX_INTERPOLATION_SEGMENTS = 4;
+
+    public GestureStrokeDrawingParams(final TypedArray mainKeyboardViewAttr) {
+        mMinSamplingDistance = mainKeyboardViewAttr.getDimension(
+                R.styleable.MainKeyboardView_gestureTrailMinSamplingDistance,
+                DEFAULT_MIN_SAMPLING_DISTANCE);
+        final int interpolationAngularDegree = mainKeyboardViewAttr.getInteger(R.styleable
+                .MainKeyboardView_gestureTrailMaxInterpolationAngularThreshold, 0);
+        mMaxInterpolationAngularThreshold = (interpolationAngularDegree <= 0)
+                ? Math.toRadians(DEFAULT_MAX_INTERPOLATION_ANGULAR_THRESHOLD)
+                : Math.toRadians(interpolationAngularDegree);
+        mMaxInterpolationDistanceThreshold = mainKeyboardViewAttr.getDimension(R.styleable
+                .MainKeyboardView_gestureTrailMaxInterpolationDistanceThreshold,
+                DEFAULT_MAX_INTERPOLATION_DISTANCE_THRESHOLD);
+        mMaxInterpolationSegments = mainKeyboardViewAttr.getInteger(
+                R.styleable.MainKeyboardView_gestureTrailMaxInterpolationSegments,
+                DEFAULT_MAX_INTERPOLATION_SEGMENTS);
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeWithPreviewPoints.java b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeDrawingPoints.java
similarity index 66%
rename from java/src/com/android/inputmethod/keyboard/internal/GestureStrokeWithPreviewPoints.java
rename to java/src/com/android/inputmethod/keyboard/internal/GestureStrokeDrawingPoints.java
index ecc67dd..7618682 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeWithPreviewPoints.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeDrawingPoints.java
@@ -16,19 +16,19 @@
 
 package com.android.inputmethod.keyboard.internal;
 
-import android.content.res.TypedArray;
-
-import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.utils.ResizableIntArray;
 
-public final class GestureStrokeWithPreviewPoints extends GestureStroke {
+/**
+ * This class holds drawing points to represent a gesture stroke on the screen.
+ */
+public final class GestureStrokeDrawingPoints {
     public static final int PREVIEW_CAPACITY = 256;
 
     private final ResizableIntArray mPreviewEventTimes = new ResizableIntArray(PREVIEW_CAPACITY);
     private final ResizableIntArray mPreviewXCoordinates = new ResizableIntArray(PREVIEW_CAPACITY);
     private final ResizableIntArray mPreviewYCoordinates = new ResizableIntArray(PREVIEW_CAPACITY);
 
-    private final GestureStrokePreviewParams mPreviewParams;
+    private final GestureStrokeDrawingParams mDrawingParams;
 
     private int mStrokeId;
     private int mLastPreviewSize;
@@ -39,56 +39,11 @@
     private int mLastY;
     private double mDistanceFromLastSample;
 
-    public static final class GestureStrokePreviewParams {
-        public final double mMinSamplingDistance; // in pixel
-        public final double mMaxInterpolationAngularThreshold; // in radian
-        public final double mMaxInterpolationDistanceThreshold; // in pixel
-        public final int mMaxInterpolationSegments;
-
-        public static final GestureStrokePreviewParams DEFAULT = new GestureStrokePreviewParams();
-
-        private static final int DEFAULT_MAX_INTERPOLATION_ANGULAR_THRESHOLD = 15; // in degree
-
-        private GestureStrokePreviewParams() {
-            mMinSamplingDistance = 0.0d;
-            mMaxInterpolationAngularThreshold =
-                    degreeToRadian(DEFAULT_MAX_INTERPOLATION_ANGULAR_THRESHOLD);
-            mMaxInterpolationDistanceThreshold = mMinSamplingDistance;
-            mMaxInterpolationSegments = 4;
-        }
-
-        private static double degreeToRadian(final int degree) {
-            return degree / 180.0d * Math.PI;
-        }
-
-        public GestureStrokePreviewParams(final TypedArray mainKeyboardViewAttr) {
-            mMinSamplingDistance = mainKeyboardViewAttr.getDimension(
-                    R.styleable.MainKeyboardView_gestureTrailMinSamplingDistance,
-                    (float)DEFAULT.mMinSamplingDistance);
-            final int interpolationAngularDegree = mainKeyboardViewAttr.getInteger(R.styleable
-                    .MainKeyboardView_gestureTrailMaxInterpolationAngularThreshold, 0);
-            mMaxInterpolationAngularThreshold = (interpolationAngularDegree <= 0)
-                    ? DEFAULT.mMaxInterpolationAngularThreshold
-                    : degreeToRadian(interpolationAngularDegree);
-            mMaxInterpolationDistanceThreshold = mainKeyboardViewAttr.getDimension(R.styleable
-                    .MainKeyboardView_gestureTrailMaxInterpolationDistanceThreshold,
-                    (float)DEFAULT.mMaxInterpolationDistanceThreshold);
-            mMaxInterpolationSegments = mainKeyboardViewAttr.getInteger(
-                    R.styleable.MainKeyboardView_gestureTrailMaxInterpolationSegments,
-                    DEFAULT.mMaxInterpolationSegments);
-        }
+    public GestureStrokeDrawingPoints(final GestureStrokeDrawingParams drawingParams) {
+        mDrawingParams = drawingParams;
     }
 
-    public GestureStrokeWithPreviewPoints(final int pointerId,
-            final GestureStrokeParams strokeParams,
-            final GestureStrokePreviewParams previewParams) {
-        super(pointerId, strokeParams);
-        mPreviewParams = previewParams;
-    }
-
-    @Override
-    protected void reset() {
-        super.reset();
+    private void reset() {
         mStrokeId++;
         mLastPreviewSize = 0;
         mLastInterpolatedPreviewIndex = 0;
@@ -101,28 +56,29 @@
         return mStrokeId;
     }
 
+    public void onDownEvent(final int x, final int y, final int elapsedTimeSinceFirstDown) {
+        reset();
+        onMoveEvent(x, y, elapsedTimeSinceFirstDown);
+    }
+
     private boolean needsSampling(final int x, final int y) {
         mDistanceFromLastSample += Math.hypot(x - mLastX, y - mLastY);
         mLastX = x;
         mLastY = y;
         final boolean isDownEvent = (mPreviewEventTimes.getLength() == 0);
-        if (mDistanceFromLastSample >= mPreviewParams.mMinSamplingDistance || isDownEvent) {
+        if (mDistanceFromLastSample >= mDrawingParams.mMinSamplingDistance || isDownEvent) {
             mDistanceFromLastSample = 0.0d;
             return true;
         }
         return false;
     }
 
-    @Override
-    public boolean addPointOnKeyboard(final int x, final int y, final int time,
-            final boolean isMajorEvent) {
+    public void onMoveEvent(final int x, final int y, final int elapsedTimeSinceFirstDown) {
         if (needsSampling(x, y)) {
-            mPreviewEventTimes.add(time);
+            mPreviewEventTimes.add(elapsedTimeSinceFirstDown);
             mPreviewXCoordinates.add(x);
             mPreviewYCoordinates.add(y);
         }
-        return super.addPointOnKeyboard(x, y, time, isMajorEvent);
-
     }
 
     /**
@@ -132,7 +88,7 @@
      * @param xCoords the x-coordinates array of gesture trail to be drawn.
      * @param yCoords the y-coordinates array of gesture trail to be drawn.
      * @param types the point types array of gesture trail. This is valid only when
-     * {@link GestureTrail#DEBUG_SHOW_POINTS} is true.
+     * {@link GestureTrailDrawingPoints#DEBUG_SHOW_POINTS} is true.
      */
     public void appendPreviewStroke(final ResizableIntArray eventTimes,
             final ResizableIntArray xCoords, final ResizableIntArray yCoords,
@@ -144,8 +100,8 @@
         eventTimes.append(mPreviewEventTimes, mLastPreviewSize, length);
         xCoords.append(mPreviewXCoordinates, mLastPreviewSize, length);
         yCoords.append(mPreviewYCoordinates, mLastPreviewSize, length);
-        if (GestureTrail.DEBUG_SHOW_POINTS) {
-            types.fill(GestureTrail.POINT_TYPE_SAMPLED, types.getLength(), length);
+        if (GestureTrailDrawingPoints.DEBUG_SHOW_POINTS) {
+            types.fill(GestureTrailDrawingPoints.POINT_TYPE_SAMPLED, types.getLength(), length);
         }
         mLastPreviewSize = mPreviewEventTimes.getLength();
     }
@@ -162,7 +118,7 @@
      * @param xCoords the x-coordinates array of gesture trail to be drawn.
      * @param yCoords the y-coordinates array of gesture trail to be drawn.
      * @param types the point types array of gesture trail. This is valid only when
-     * {@link GestureTrail#DEBUG_SHOW_POINTS} is true.
+     * {@link GestureTrailDrawingPoints#DEBUG_SHOW_POINTS} is true.
      * @return the start index of the last interpolated segment of input arrays.
      */
     public int interpolateStrokeAndReturnStartIndexOfLastSegment(final int lastInterpolatedIndex,
@@ -188,12 +144,12 @@
             final double m2 = Math.atan2(mInterpolator.mSlope2Y, mInterpolator.mSlope2X);
             final double deltaAngle = Math.abs(angularDiff(m2, m1));
             final int segmentsByAngle = (int)Math.ceil(
-                    deltaAngle / mPreviewParams.mMaxInterpolationAngularThreshold);
+                    deltaAngle / mDrawingParams.mMaxInterpolationAngularThreshold);
             final double deltaDistance = Math.hypot(mInterpolator.mP1X - mInterpolator.mP2X,
                     mInterpolator.mP1Y - mInterpolator.mP2Y);
             final int segmentsByDistance = (int)Math.ceil(deltaDistance
-                    / mPreviewParams.mMaxInterpolationDistanceThreshold);
-            final int segments = Math.min(mPreviewParams.mMaxInterpolationSegments,
+                    / mDrawingParams.mMaxInterpolationDistanceThreshold);
+            final int segments = Math.min(mDrawingParams.mMaxInterpolationSegments,
                     Math.max(segmentsByAngle, segmentsByDistance));
             final int t1 = eventTimes.get(d1);
             final int dt = pt[p2] - pt[p1];
@@ -204,16 +160,16 @@
                 eventTimes.add(d1, (int)(dt * t) + t1);
                 xCoords.add(d1, (int)mInterpolator.mInterpolatedX);
                 yCoords.add(d1, (int)mInterpolator.mInterpolatedY);
-                if (GestureTrail.DEBUG_SHOW_POINTS) {
-                    types.add(d1, GestureTrail.POINT_TYPE_INTERPOLATED);
+                if (GestureTrailDrawingPoints.DEBUG_SHOW_POINTS) {
+                    types.add(d1, GestureTrailDrawingPoints.POINT_TYPE_INTERPOLATED);
                 }
                 d1++;
             }
             eventTimes.add(d1, pt[p2]);
             xCoords.add(d1, px[p2]);
             yCoords.add(d1, py[p2]);
-            if (GestureTrail.DEBUG_SHOW_POINTS) {
-                types.add(d1, GestureTrail.POINT_TYPE_SAMPLED);
+            if (GestureTrailDrawingPoints.DEBUG_SHOW_POINTS) {
+                types.add(d1, GestureTrailDrawingPoints.POINT_TYPE_SAMPLED);
             }
         }
         return lastInterpolatedDrawIndex;
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeRecognitionParams.java b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeRecognitionParams.java
new file mode 100644
index 0000000..07b1451
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeRecognitionParams.java
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.content.res.TypedArray;
+
+import com.android.inputmethod.latin.R;
+import com.android.inputmethod.latin.utils.ResourceUtils;
+
+/**
+ * This class holds parameters to control how a gesture stroke is sampled and recognized.
+ * This class also has parameters to distinguish gesture input events from fast typing events.
+ *
+ * @attr ref R.styleable#MainKeyboardView_gestureStaticTimeThresholdAfterFastTyping
+ * @attr ref R.styleable#MainKeyboardView_gestureDetectFastMoveSpeedThreshold
+ * @attr ref R.styleable#MainKeyboardView_gestureDynamicThresholdDecayDuration
+ * @attr ref R.styleable#MainKeyboardView_gestureDynamicTimeThresholdFrom
+ * @attr ref R.styleable#MainKeyboardView_gestureDynamicTimeThresholdTo
+ * @attr ref R.styleable#MainKeyboardView_gestureDynamicDistanceThresholdFrom
+ * @attr ref R.styleable#MainKeyboardView_gestureDynamicDistanceThresholdTo
+ * @attr ref R.styleable#MainKeyboardView_gestureSamplingMinimumDistance
+ * @attr ref R.styleable#MainKeyboardView_gestureRecognitionMinimumTime
+ * @attr ref R.styleable#MainKeyboardView_gestureRecognitionSpeedThreshold
+ */
+public final class GestureStrokeRecognitionParams {
+    // Static threshold for gesture after fast typing
+    public final int mStaticTimeThresholdAfterFastTyping; // msec
+    // Static threshold for starting gesture detection
+    public final float mDetectFastMoveSpeedThreshold; // keyWidth/sec
+    // Dynamic threshold for gesture after fast typing
+    public final int mDynamicThresholdDecayDuration; // msec
+    // Time based threshold values
+    public final int mDynamicTimeThresholdFrom; // msec
+    public final int mDynamicTimeThresholdTo; // msec
+    // Distance based threshold values
+    public final float mDynamicDistanceThresholdFrom; // keyWidth
+    public final float mDynamicDistanceThresholdTo; // keyWidth
+    // Parameters for gesture sampling
+    public final float mSamplingMinimumDistance; // keyWidth
+    // Parameters for gesture recognition
+    public final int mRecognitionMinimumTime; // msec
+    public final float mRecognitionSpeedThreshold; // keyWidth/sec
+
+    // Default GestureStrokeRecognitionPoints parameters.
+    public static final GestureStrokeRecognitionParams DEFAULT =
+            new GestureStrokeRecognitionParams();
+
+    private GestureStrokeRecognitionParams() {
+        // These parameter values are default and intended for testing.
+        mStaticTimeThresholdAfterFastTyping = 350; // msec
+        mDetectFastMoveSpeedThreshold = 1.5f; // keyWidth/sec
+        mDynamicThresholdDecayDuration = 450; // msec
+        mDynamicTimeThresholdFrom = 300; // msec
+        mDynamicTimeThresholdTo = 20; // msec
+        mDynamicDistanceThresholdFrom = 6.0f; // keyWidth
+        mDynamicDistanceThresholdTo = 0.35f; // keyWidth
+        // The following parameters' change will affect the result of regression test.
+        mSamplingMinimumDistance = 1.0f / 6.0f; // keyWidth
+        mRecognitionMinimumTime = 100; // msec
+        mRecognitionSpeedThreshold = 5.5f; // keyWidth/sec
+    }
+
+    public GestureStrokeRecognitionParams(final TypedArray mainKeyboardViewAttr) {
+        mStaticTimeThresholdAfterFastTyping = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureStaticTimeThresholdAfterFastTyping,
+                DEFAULT.mStaticTimeThresholdAfterFastTyping);
+        mDetectFastMoveSpeedThreshold = ResourceUtils.getFraction(mainKeyboardViewAttr,
+                R.styleable.MainKeyboardView_gestureDetectFastMoveSpeedThreshold,
+                DEFAULT.mDetectFastMoveSpeedThreshold);
+        mDynamicThresholdDecayDuration = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureDynamicThresholdDecayDuration,
+                DEFAULT.mDynamicThresholdDecayDuration);
+        mDynamicTimeThresholdFrom = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureDynamicTimeThresholdFrom,
+                DEFAULT.mDynamicTimeThresholdFrom);
+        mDynamicTimeThresholdTo = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureDynamicTimeThresholdTo,
+                DEFAULT.mDynamicTimeThresholdTo);
+        mDynamicDistanceThresholdFrom = ResourceUtils.getFraction(mainKeyboardViewAttr,
+                R.styleable.MainKeyboardView_gestureDynamicDistanceThresholdFrom,
+                DEFAULT.mDynamicDistanceThresholdFrom);
+        mDynamicDistanceThresholdTo = ResourceUtils.getFraction(mainKeyboardViewAttr,
+                R.styleable.MainKeyboardView_gestureDynamicDistanceThresholdTo,
+                DEFAULT.mDynamicDistanceThresholdTo);
+        mSamplingMinimumDistance = ResourceUtils.getFraction(mainKeyboardViewAttr,
+                R.styleable.MainKeyboardView_gestureSamplingMinimumDistance,
+                DEFAULT.mSamplingMinimumDistance);
+        mRecognitionMinimumTime = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureRecognitionMinimumTime,
+                DEFAULT.mRecognitionMinimumTime);
+        mRecognitionSpeedThreshold = ResourceUtils.getFraction(mainKeyboardViewAttr,
+                R.styleable.MainKeyboardView_gestureRecognitionSpeedThreshold,
+                DEFAULT.mRecognitionSpeedThreshold);
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeRecognitionPoints.java b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeRecognitionPoints.java
new file mode 100644
index 0000000..e49e538
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureStrokeRecognitionPoints.java
@@ -0,0 +1,334 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.util.Log;
+
+import com.android.inputmethod.latin.Constants;
+import com.android.inputmethod.latin.InputPointers;
+import com.android.inputmethod.latin.utils.ResizableIntArray;
+
+/**
+ * This class holds event points to recognize a gesture stroke.
+ * TODO: Should be package private class.
+ */
+public final class GestureStrokeRecognitionPoints {
+    private static final String TAG = GestureStrokeRecognitionPoints.class.getSimpleName();
+    private static final boolean DEBUG = false;
+    private static final boolean DEBUG_SPEED = false;
+
+    // The height of extra area above the keyboard to draw gesture trails.
+    // Proportional to the keyboard height.
+    public static final float EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO = 0.25f;
+
+    private final int mPointerId;
+    private final ResizableIntArray mEventTimes = new ResizableIntArray(
+            Constants.DEFAULT_GESTURE_POINTS_CAPACITY);
+    private final ResizableIntArray mXCoordinates = new ResizableIntArray(
+            Constants.DEFAULT_GESTURE_POINTS_CAPACITY);
+    private final ResizableIntArray mYCoordinates = new ResizableIntArray(
+            Constants.DEFAULT_GESTURE_POINTS_CAPACITY);
+
+    private final GestureStrokeRecognitionParams mRecognitionParams;
+
+    private int mKeyWidth; // pixel
+    private int mMinYCoordinate; // pixel
+    private int mMaxYCoordinate; // pixel
+    // Static threshold for starting gesture detection
+    private int mDetectFastMoveSpeedThreshold; // pixel /sec
+    private int mDetectFastMoveTime;
+    private int mDetectFastMoveX;
+    private int mDetectFastMoveY;
+    // Dynamic threshold for gesture after fast typing
+    private boolean mAfterFastTyping;
+    private int mGestureDynamicDistanceThresholdFrom; // pixel
+    private int mGestureDynamicDistanceThresholdTo; // pixel
+    // Variables for gesture sampling
+    private int mGestureSamplingMinimumDistance; // pixel
+    private long mLastMajorEventTime;
+    private int mLastMajorEventX;
+    private int mLastMajorEventY;
+    // Variables for gesture recognition
+    private int mGestureRecognitionSpeedThreshold; // pixel / sec
+    private int mIncrementalRecognitionSize;
+    private int mLastIncrementalBatchSize;
+
+    private static final int MSEC_PER_SEC = 1000;
+
+    // TODO: Make this package private
+    public GestureStrokeRecognitionPoints(final int pointerId,
+            final GestureStrokeRecognitionParams recognitionParams) {
+        mPointerId = pointerId;
+        mRecognitionParams = recognitionParams;
+    }
+
+    // TODO: Make this package private
+    public void setKeyboardGeometry(final int keyWidth, final int keyboardHeight) {
+        mKeyWidth = keyWidth;
+        mMinYCoordinate = -(int)(keyboardHeight * EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO);
+        mMaxYCoordinate = keyboardHeight;
+        // TODO: Find an appropriate base metric for these length. Maybe diagonal length of the key?
+        mDetectFastMoveSpeedThreshold = (int)(
+                keyWidth * mRecognitionParams.mDetectFastMoveSpeedThreshold);
+        mGestureDynamicDistanceThresholdFrom = (int)(
+                keyWidth * mRecognitionParams.mDynamicDistanceThresholdFrom);
+        mGestureDynamicDistanceThresholdTo = (int)(
+                keyWidth * mRecognitionParams.mDynamicDistanceThresholdTo);
+        mGestureSamplingMinimumDistance = (int)(
+                keyWidth * mRecognitionParams.mSamplingMinimumDistance);
+        mGestureRecognitionSpeedThreshold = (int)(
+                keyWidth * mRecognitionParams.mRecognitionSpeedThreshold);
+        if (DEBUG) {
+            Log.d(TAG, String.format(
+                    "[%d] setKeyboardGeometry: keyWidth=%3d tT=%3d >> %3d tD=%3d >> %3d",
+                    mPointerId, keyWidth,
+                    mRecognitionParams.mDynamicTimeThresholdFrom,
+                    mRecognitionParams.mDynamicTimeThresholdTo,
+                    mGestureDynamicDistanceThresholdFrom,
+                    mGestureDynamicDistanceThresholdTo));
+        }
+    }
+
+    // TODO: Make this package private
+    public int getLength() {
+        return mEventTimes.getLength();
+    }
+
+    // TODO: Make this package private
+    public void addDownEventPoint(final int x, final int y, final int elapsedTimeSinceFirstDown,
+            final int elapsedTimeSinceLastTyping) {
+        reset();
+        if (elapsedTimeSinceLastTyping < mRecognitionParams.mStaticTimeThresholdAfterFastTyping) {
+            mAfterFastTyping = true;
+        }
+        if (DEBUG) {
+            Log.d(TAG, String.format("[%d] onDownEvent: dT=%3d%s", mPointerId,
+                    elapsedTimeSinceLastTyping, mAfterFastTyping ? " afterFastTyping" : ""));
+        }
+        // Call {@link #addEventPoint(int,int,int,boolean)} to record this down event point as a
+        // major event point.
+        addEventPoint(x, y, elapsedTimeSinceFirstDown, true /* isMajorEvent */);
+    }
+
+    private int getGestureDynamicDistanceThreshold(final int deltaTime) {
+        if (!mAfterFastTyping || deltaTime >= mRecognitionParams.mDynamicThresholdDecayDuration) {
+            return mGestureDynamicDistanceThresholdTo;
+        }
+        final int decayedThreshold =
+                (mGestureDynamicDistanceThresholdFrom - mGestureDynamicDistanceThresholdTo)
+                * deltaTime / mRecognitionParams.mDynamicThresholdDecayDuration;
+        return mGestureDynamicDistanceThresholdFrom - decayedThreshold;
+    }
+
+    private int getGestureDynamicTimeThreshold(final int deltaTime) {
+        if (!mAfterFastTyping || deltaTime >= mRecognitionParams.mDynamicThresholdDecayDuration) {
+            return mRecognitionParams.mDynamicTimeThresholdTo;
+        }
+        final int decayedThreshold =
+                (mRecognitionParams.mDynamicTimeThresholdFrom
+                        - mRecognitionParams.mDynamicTimeThresholdTo)
+                * deltaTime / mRecognitionParams.mDynamicThresholdDecayDuration;
+        return mRecognitionParams.mDynamicTimeThresholdFrom - decayedThreshold;
+    }
+
+    // TODO: Make this package private
+    public final boolean isStartOfAGesture() {
+        if (!hasDetectedFastMove()) {
+            return false;
+        }
+        final int size = getLength();
+        if (size <= 0) {
+            return false;
+        }
+        final int lastIndex = size - 1;
+        final int deltaTime = mEventTimes.get(lastIndex) - mDetectFastMoveTime;
+        if (deltaTime < 0) {
+            return false;
+        }
+        final int deltaDistance = getDistance(
+                mXCoordinates.get(lastIndex), mYCoordinates.get(lastIndex),
+                mDetectFastMoveX, mDetectFastMoveY);
+        final int distanceThreshold = getGestureDynamicDistanceThreshold(deltaTime);
+        final int timeThreshold = getGestureDynamicTimeThreshold(deltaTime);
+        final boolean isStartOfAGesture = deltaTime >= timeThreshold
+                && deltaDistance >= distanceThreshold;
+        if (DEBUG) {
+            Log.d(TAG, String.format("[%d] isStartOfAGesture: dT=%3d tT=%3d dD=%3d tD=%3d%s%s",
+                    mPointerId, deltaTime, timeThreshold,
+                    deltaDistance, distanceThreshold,
+                    mAfterFastTyping ? " afterFastTyping" : "",
+                    isStartOfAGesture ? " startOfAGesture" : ""));
+        }
+        return isStartOfAGesture;
+    }
+
+    // TODO: Make this package private
+    public void duplicateLastPointWith(final int time) {
+        final int lastIndex = getLength() - 1;
+        if (lastIndex >= 0) {
+            final int x = mXCoordinates.get(lastIndex);
+            final int y = mYCoordinates.get(lastIndex);
+            if (DEBUG) {
+                Log.d(TAG, String.format("[%d] duplicateLastPointWith: %d,%d|%d", mPointerId,
+                        x, y, time));
+            }
+            // TODO: Have appendMajorPoint()
+            appendPoint(x, y, time);
+            updateIncrementalRecognitionSize(x, y, time);
+        }
+    }
+
+    private void reset() {
+        mIncrementalRecognitionSize = 0;
+        mLastIncrementalBatchSize = 0;
+        mEventTimes.setLength(0);
+        mXCoordinates.setLength(0);
+        mYCoordinates.setLength(0);
+        mLastMajorEventTime = 0;
+        mDetectFastMoveTime = 0;
+        mAfterFastTyping = false;
+    }
+
+    private void appendPoint(final int x, final int y, final int time) {
+        final int lastIndex = getLength() - 1;
+        // The point that is created by {@link duplicateLastPointWith(int)} may have later event
+        // time than the next {@link MotionEvent}. To maintain the monotonicity of the event time,
+        // drop the successive point here.
+        if (lastIndex >= 0 && mEventTimes.get(lastIndex) > time) {
+            Log.w(TAG, String.format("[%d] drop stale event: %d,%d|%d last: %d,%d|%d", mPointerId,
+                    x, y, time, mXCoordinates.get(lastIndex), mYCoordinates.get(lastIndex),
+                    mEventTimes.get(lastIndex)));
+            return;
+        }
+        mEventTimes.add(time);
+        mXCoordinates.add(x);
+        mYCoordinates.add(y);
+    }
+
+    private void updateMajorEvent(final int x, final int y, final int time) {
+        mLastMajorEventTime = time;
+        mLastMajorEventX = x;
+        mLastMajorEventY = y;
+    }
+
+    private final boolean hasDetectedFastMove() {
+        return mDetectFastMoveTime > 0;
+    }
+
+    private int detectFastMove(final int x, final int y, final int time) {
+        final int size = getLength();
+        final int lastIndex = size - 1;
+        final int lastX = mXCoordinates.get(lastIndex);
+        final int lastY = mYCoordinates.get(lastIndex);
+        final int dist = getDistance(lastX, lastY, x, y);
+        final int msecs = time - mEventTimes.get(lastIndex);
+        if (msecs > 0) {
+            final int pixels = getDistance(lastX, lastY, x, y);
+            final int pixelsPerSec = pixels * MSEC_PER_SEC;
+            if (DEBUG_SPEED) {
+                final float speed = (float)pixelsPerSec / msecs / mKeyWidth;
+                Log.d(TAG, String.format("[%d] detectFastMove: speed=%5.2f", mPointerId, speed));
+            }
+            // Equivalent to (pixels / msecs < mStartSpeedThreshold / MSEC_PER_SEC)
+            if (!hasDetectedFastMove() && pixelsPerSec > mDetectFastMoveSpeedThreshold * msecs) {
+                if (DEBUG) {
+                    final float speed = (float)pixelsPerSec / msecs / mKeyWidth;
+                    Log.d(TAG, String.format(
+                            "[%d] detectFastMove: speed=%5.2f T=%3d points=%3d fastMove",
+                            mPointerId, speed, time, size));
+                }
+                mDetectFastMoveTime = time;
+                mDetectFastMoveX = x;
+                mDetectFastMoveY = y;
+            }
+        }
+        return dist;
+    }
+
+    /**
+     * Add an event point to this gesture stroke recognition points. Returns true if the event
+     * point is on the valid gesture area.
+     * @param x the x-coordinate of the event point
+     * @param y the y-coordinate of the event point
+     * @param time the elapsed time in millisecond from the first gesture down
+     * @param isMajorEvent false if this is a historical move event
+     * @return true if the event point is on the valid gesture area
+     */
+    // TODO: Make this package private
+    public boolean addEventPoint(final int x, final int y, final int time,
+            final boolean isMajorEvent) {
+        final int size = getLength();
+        if (size <= 0) {
+            // The first event of this stroke (a.k.a. down event).
+            appendPoint(x, y, time);
+            updateMajorEvent(x, y, time);
+        } else {
+            final int distance = detectFastMove(x, y, time);
+            if (distance > mGestureSamplingMinimumDistance) {
+                appendPoint(x, y, time);
+            }
+        }
+        if (isMajorEvent) {
+            updateIncrementalRecognitionSize(x, y, time);
+            updateMajorEvent(x, y, time);
+        }
+        return y >= mMinYCoordinate && y < mMaxYCoordinate;
+    }
+
+    private void updateIncrementalRecognitionSize(final int x, final int y, final int time) {
+        final int msecs = (int)(time - mLastMajorEventTime);
+        if (msecs <= 0) {
+            return;
+        }
+        final int pixels = getDistance(mLastMajorEventX, mLastMajorEventY, x, y);
+        final int pixelsPerSec = pixels * MSEC_PER_SEC;
+        // Equivalent to (pixels / msecs < mGestureRecognitionThreshold / MSEC_PER_SEC)
+        if (pixelsPerSec < mGestureRecognitionSpeedThreshold * msecs) {
+            mIncrementalRecognitionSize = getLength();
+        }
+    }
+
+    // TODO: Make this package private
+    public final boolean hasRecognitionTimePast(
+            final long currentTime, final long lastRecognitionTime) {
+        return currentTime > lastRecognitionTime + mRecognitionParams.mRecognitionMinimumTime;
+    }
+
+    // TODO: Make this package private
+    public final void appendAllBatchPoints(final InputPointers out) {
+        appendBatchPoints(out, getLength());
+    }
+
+    // TODO: Make this package private
+    public final void appendIncrementalBatchPoints(final InputPointers out) {
+        appendBatchPoints(out, mIncrementalRecognitionSize);
+    }
+
+    private void appendBatchPoints(final InputPointers out, final int size) {
+        final int length = size - mLastIncrementalBatchSize;
+        if (length <= 0) {
+            return;
+        }
+        out.append(mPointerId, mEventTimes, mXCoordinates, mYCoordinates,
+                mLastIncrementalBatchSize, length);
+        mLastIncrementalBatchSize = size;
+    }
+
+    private static int getDistance(final int x1, final int y1, final int x2, final int y2) {
+        return (int)Math.hypot(x1 - x2, y1 - y2);
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureTrailDrawingParams.java b/java/src/com/android/inputmethod/keyboard/internal/GestureTrailDrawingParams.java
new file mode 100644
index 0000000..088f03a
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureTrailDrawingParams.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.content.res.TypedArray;
+
+import com.android.inputmethod.latin.R;
+
+/**
+ * This class holds parameters to control how a gesture trail is drawn and animated on the screen.
+ *
+ * On the other hand, {@link GestureStrokeDrawingParams} class controls how each gesture stroke is
+ * sampled and interpolated. This class controls how those gesture strokes are displayed as a
+ * gesture trail and animated on the screen.
+ *
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailFadeoutStartDelay
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailFadeoutDuration
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailUpdateInterval
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailColor
+ * @attr ref R.styleable#MainKeyboardView_gestureTrailWidth
+ */
+final class GestureTrailDrawingParams {
+    private static final int FADEOUT_START_DELAY_FOR_DEBUG = 2000; // millisecond
+    private static final int FADEOUT_DURATION_FOR_DEBUG = 200; // millisecond
+
+    public final int mTrailColor;
+    public final float mTrailStartWidth;
+    public final float mTrailEndWidth;
+    public final float mTrailBodyRatio;
+    public boolean mTrailShadowEnabled;
+    public final float mTrailShadowRatio;
+    public final int mFadeoutStartDelay;
+    public final int mFadeoutDuration;
+    public final int mUpdateInterval;
+
+    public final int mTrailLingerDuration;
+
+    public GestureTrailDrawingParams(final TypedArray mainKeyboardViewAttr) {
+        mTrailColor = mainKeyboardViewAttr.getColor(
+                R.styleable.MainKeyboardView_gestureTrailColor, 0);
+        mTrailStartWidth = mainKeyboardViewAttr.getDimension(
+                R.styleable.MainKeyboardView_gestureTrailStartWidth, 0.0f);
+        mTrailEndWidth = mainKeyboardViewAttr.getDimension(
+                R.styleable.MainKeyboardView_gestureTrailEndWidth, 0.0f);
+        final int PERCENTAGE_INT = 100;
+        mTrailBodyRatio = (float)mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureTrailBodyRatio, PERCENTAGE_INT)
+                / (float)PERCENTAGE_INT;
+        final int trailShadowRatioInt = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureTrailShadowRatio, 0);
+        mTrailShadowEnabled = (trailShadowRatioInt > 0);
+        mTrailShadowRatio = (float)trailShadowRatioInt / (float)PERCENTAGE_INT;
+        mFadeoutStartDelay = GestureTrailDrawingPoints.DEBUG_SHOW_POINTS
+                ? FADEOUT_START_DELAY_FOR_DEBUG
+                : mainKeyboardViewAttr.getInt(
+                        R.styleable.MainKeyboardView_gestureTrailFadeoutStartDelay, 0);
+        mFadeoutDuration = GestureTrailDrawingPoints.DEBUG_SHOW_POINTS
+                ? FADEOUT_DURATION_FOR_DEBUG
+                : mainKeyboardViewAttr.getInt(
+                        R.styleable.MainKeyboardView_gestureTrailFadeoutDuration, 0);
+        mTrailLingerDuration = mFadeoutStartDelay + mFadeoutDuration;
+        mUpdateInterval = mainKeyboardViewAttr.getInt(
+                R.styleable.MainKeyboardView_gestureTrailUpdateInterval, 0);
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureTrail.java b/java/src/com/android/inputmethod/keyboard/internal/GestureTrailDrawingPoints.java
similarity index 77%
rename from java/src/com/android/inputmethod/keyboard/internal/GestureTrail.java
rename to java/src/com/android/inputmethod/keyboard/internal/GestureTrailDrawingPoints.java
index aca6679..bf4c4da 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/GestureTrail.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureTrailDrawingPoints.java
@@ -16,7 +16,6 @@
 
 package com.android.inputmethod.keyboard.internal;
 
-import android.content.res.TypedArray;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
@@ -25,24 +24,22 @@
 import android.os.SystemClock;
 
 import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.utils.ResizableIntArray;
 
-/*
- * @attr ref R.styleable#MainKeyboardView_gestureTrailFadeoutStartDelay
- * @attr ref R.styleable#MainKeyboardView_gestureTrailFadeoutDuration
- * @attr ref R.styleable#MainKeyboardView_gestureTrailUpdateInterval
- * @attr ref R.styleable#MainKeyboardView_gestureTrailColor
- * @attr ref R.styleable#MainKeyboardView_gestureTrailWidth
+/**
+ * This class holds drawing points to represent a gesture trail. The gesture trail may contain
+ * multiple non-contiguous gesture strokes and will be animated asynchronously from gesture input.
+ *
+ * On the other hand, {@link GestureStrokeDrawingPoints} class holds drawing points of each gesture
+ * stroke. This class holds drawing points of those gesture strokes to draw as a gesture trail.
+ * Drawing points in this class will be asynchronously removed when fading out animation goes.
  */
-final class GestureTrail {
+final class GestureTrailDrawingPoints {
     public static final boolean DEBUG_SHOW_POINTS = false;
     public static final int POINT_TYPE_SAMPLED = 1;
     public static final int POINT_TYPE_INTERPOLATED = 2;
-    private static final int FADEOUT_START_DELAY_FOR_DEBUG = 2000; // millisecond
-    private static final int FADEOUT_DURATION_FOR_DEBUG = 200; // millisecond
 
-    private static final int DEFAULT_CAPACITY = GestureStrokeWithPreviewPoints.PREVIEW_CAPACITY;
+    private static final int DEFAULT_CAPACITY = GestureStrokeDrawingPoints.PREVIEW_CAPACITY;
 
     // These three {@link ResizableIntArray}s should be synchronized by {@link #mEventTimes}.
     private final ResizableIntArray mXCoordinates = new ResizableIntArray(DEFAULT_CAPACITY);
@@ -56,46 +53,6 @@
     private int mTrailStartIndex;
     private int mLastInterpolatedDrawIndex;
 
-    static final class Params {
-        public final int mTrailColor;
-        public final float mTrailStartWidth;
-        public final float mTrailEndWidth;
-        public final float mTrailBodyRatio;
-        public boolean mTrailShadowEnabled;
-        public final float mTrailShadowRatio;
-        public final int mFadeoutStartDelay;
-        public final int mFadeoutDuration;
-        public final int mUpdateInterval;
-
-        public final int mTrailLingerDuration;
-
-        public Params(final TypedArray mainKeyboardViewAttr) {
-            mTrailColor = mainKeyboardViewAttr.getColor(
-                    R.styleable.MainKeyboardView_gestureTrailColor, 0);
-            mTrailStartWidth = mainKeyboardViewAttr.getDimension(
-                    R.styleable.MainKeyboardView_gestureTrailStartWidth, 0.0f);
-            mTrailEndWidth = mainKeyboardViewAttr.getDimension(
-                    R.styleable.MainKeyboardView_gestureTrailEndWidth, 0.0f);
-            final int PERCENTAGE_INT = 100;
-            mTrailBodyRatio = (float)mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureTrailBodyRatio, PERCENTAGE_INT)
-                    / (float)PERCENTAGE_INT;
-            final int trailShadowRatioInt = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureTrailShadowRatio, 0);
-            mTrailShadowEnabled = (trailShadowRatioInt > 0);
-            mTrailShadowRatio = (float)trailShadowRatioInt / (float)PERCENTAGE_INT;
-            mFadeoutStartDelay = DEBUG_SHOW_POINTS ? FADEOUT_START_DELAY_FOR_DEBUG
-                    : mainKeyboardViewAttr.getInt(
-                            R.styleable.MainKeyboardView_gestureTrailFadeoutStartDelay, 0);
-            mFadeoutDuration = DEBUG_SHOW_POINTS ? FADEOUT_DURATION_FOR_DEBUG
-                    : mainKeyboardViewAttr.getInt(
-                            R.styleable.MainKeyboardView_gestureTrailFadeoutDuration, 0);
-            mTrailLingerDuration = mFadeoutStartDelay + mFadeoutDuration;
-            mUpdateInterval = mainKeyboardViewAttr.getInt(
-                    R.styleable.MainKeyboardView_gestureTrailUpdateInterval, 0);
-        }
-    }
-
     // Use this value as imaginary zero because x-coordinates may be zero.
     private static final int DOWN_EVENT_MARKER = -128;
 
@@ -112,13 +69,13 @@
                 ? DOWN_EVENT_MARKER - xCoordOrMark : xCoordOrMark;
     }
 
-    public void addStroke(final GestureStrokeWithPreviewPoints stroke, final long downTime) {
+    public void addStroke(final GestureStrokeDrawingPoints stroke, final long downTime) {
         synchronized (mEventTimes) {
             addStrokeLocked(stroke, downTime);
         }
     }
 
-    private void addStrokeLocked(final GestureStrokeWithPreviewPoints stroke, final long downTime) {
+    private void addStrokeLocked(final GestureStrokeDrawingPoints stroke, final long downTime) {
         final int trailSize = mEventTimes.getLength();
         stroke.appendPreviewStroke(mEventTimes, mXCoordinates, mYCoordinates, mPointTypes);
         if (mEventTimes.getLength() == trailSize) {
@@ -126,13 +83,14 @@
         }
         final int[] eventTimes = mEventTimes.getPrimitiveArray();
         final int strokeId = stroke.getGestureStrokeId();
-        // Because interpolation algorithm in {@link GestureStrokeWithPreviewPoints} can't determine
+        // Because interpolation algorithm in {@link GestureStrokeDrawingPoints} can't determine
         // the interpolated points in the last segment of gesture stroke, it may need recalculation
         // of interpolation when new segments are added to the stroke.
         // {@link #mLastInterpolatedDrawIndex} holds the start index of the last segment. It may
         // be updated by the interpolation
-        // {@link GestureStrokeWithPreviewPoints#interpolatePreviewStroke}
-        // or by animation {@link #drawGestureTrail(Canvas,Paint,Rect,Params)} below.
+        // {@link GestureStrokeDrawingPoints#interpolatePreviewStroke}
+        // or by animation {@link #drawGestureTrail(Canvas,Paint,Rect,GestureTrailDrawingParams)}
+        // below.
         final int lastInterpolatedIndex = (strokeId == mCurrentStrokeId)
                 ? mLastInterpolatedDrawIndex : trailSize;
         mLastInterpolatedDrawIndex = stroke.interpolateStrokeAndReturnStartIndexOfLastSegment(
@@ -161,7 +119,7 @@
      * @param params gesture trail display parameters
      * @return the width of a gesture trail
      */
-    private static int getAlpha(final int elapsedTime, final Params params) {
+    private static int getAlpha(final int elapsedTime, final GestureTrailDrawingParams params) {
         if (elapsedTime < params.mFadeoutStartDelay) {
             return Constants.Color.ALPHA_OPAQUE;
         }
@@ -180,7 +138,7 @@
      * @param params gesture trail display parameters
      * @return the width of a gesture trail
      */
-    private static float getWidth(final int elapsedTime, final Params params) {
+    private static float getWidth(final int elapsedTime, final GestureTrailDrawingParams params) {
         final float deltaWidth = params.mTrailStartWidth - params.mTrailEndWidth;
         return params.mTrailStartWidth - (deltaWidth * elapsedTime) / params.mTrailLingerDuration;
     }
@@ -197,14 +155,14 @@
      * @return true if some gesture trails remain to be drawn
      */
     public boolean drawGestureTrail(final Canvas canvas, final Paint paint,
-            final Rect outBoundsRect, final Params params) {
+            final Rect outBoundsRect, final GestureTrailDrawingParams params) {
         synchronized (mEventTimes) {
             return drawGestureTrailLocked(canvas, paint, outBoundsRect, params);
         }
     }
 
     private boolean drawGestureTrailLocked(final Canvas canvas, final Paint paint,
-            final Rect outBoundsRect, final Params params) {
+            final Rect outBoundsRect, final GestureTrailDrawingParams params) {
         // Initialize bounds rectangle.
         outBoundsRect.setEmpty();
         final int trailSize = mEventTimes.getLength();
diff --git a/java/src/com/android/inputmethod/keyboard/internal/GestureTrailsPreview.java b/java/src/com/android/inputmethod/keyboard/internal/GestureTrailsDrawingPreview.java
similarity index 77%
rename from java/src/com/android/inputmethod/keyboard/internal/GestureTrailsPreview.java
rename to java/src/com/android/inputmethod/keyboard/internal/GestureTrailsDrawingPreview.java
index 19e9955..eef4b36 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/GestureTrailsPreview.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/GestureTrailsDrawingPreview.java
@@ -29,16 +29,16 @@
 import android.view.View;
 
 import com.android.inputmethod.keyboard.PointerTracker;
-import com.android.inputmethod.keyboard.internal.GestureTrail.Params;
 import com.android.inputmethod.latin.utils.CollectionUtils;
-import com.android.inputmethod.latin.utils.StaticInnerHandlerWrapper;
+import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
 
 /**
- * Draw gesture trail preview graphics during gesture.
+ * Draw preview graphics of multiple gesture trails during gesture input.
  */
-public final class GestureTrailsPreview extends AbstractDrawingPreview {
-    private final SparseArray<GestureTrail> mGestureTrails = CollectionUtils.newSparseArray();
-    private final Params mGestureTrailParams;
+public final class GestureTrailsDrawingPreview extends AbstractDrawingPreview {
+    private final SparseArray<GestureTrailDrawingPoints> mGestureTrails =
+            CollectionUtils.newSparseArray();
+    private final GestureTrailDrawingParams mDrawingParams;
     private final Paint mGesturePaint;
     private int mOffscreenWidth;
     private int mOffscreenHeight;
@@ -52,21 +52,23 @@
     private final DrawingHandler mDrawingHandler;
 
     private static final class DrawingHandler
-            extends StaticInnerHandlerWrapper<GestureTrailsPreview> {
+            extends LeakGuardHandlerWrapper<GestureTrailsDrawingPreview> {
         private static final int MSG_UPDATE_GESTURE_TRAIL = 0;
 
-        private final Params mGestureTrailParams;
+        private final GestureTrailDrawingParams mDrawingParams;
 
-        public DrawingHandler(final GestureTrailsPreview outerInstance,
-                final Params gestureTrailParams) {
-            super(outerInstance);
-            mGestureTrailParams = gestureTrailParams;
+        public DrawingHandler(final GestureTrailsDrawingPreview ownerInstance,
+                final GestureTrailDrawingParams drawingParams) {
+            super(ownerInstance);
+            mDrawingParams = drawingParams;
         }
 
         @Override
         public void handleMessage(final Message msg) {
-            final GestureTrailsPreview preview = getOuterInstance();
-            if (preview == null) return;
+            final GestureTrailsDrawingPreview preview = getOwnerInstance();
+            if (preview == null) {
+                return;
+            }
             switch (msg.what) {
             case MSG_UPDATE_GESTURE_TRAIL:
                 preview.getDrawingView().invalidate();
@@ -77,14 +79,15 @@
         public void postUpdateGestureTrailPreview() {
             removeMessages(MSG_UPDATE_GESTURE_TRAIL);
             sendMessageDelayed(obtainMessage(MSG_UPDATE_GESTURE_TRAIL),
-                    mGestureTrailParams.mUpdateInterval);
+                    mDrawingParams.mUpdateInterval);
         }
     }
 
-    public GestureTrailsPreview(final View drawingView, final TypedArray mainKeyboardViewAttr) {
+    public GestureTrailsDrawingPreview(final View drawingView,
+            final TypedArray mainKeyboardViewAttr) {
         super(drawingView);
-        mGestureTrailParams = new Params(mainKeyboardViewAttr);
-        mDrawingHandler = new DrawingHandler(this, mGestureTrailParams);
+        mDrawingParams = new GestureTrailDrawingParams(mainKeyboardViewAttr);
+        mDrawingHandler = new DrawingHandler(this, mDrawingParams);
         final Paint gesturePaint = new Paint();
         gesturePaint.setAntiAlias(true);
         gesturePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
@@ -93,18 +96,14 @@
 
     @Override
     public void setKeyboardGeometry(final int[] originCoords, final int width, final int height) {
-        mOffscreenOffsetY = (int)(
-                height * GestureStroke.EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO);
+        mOffscreenOffsetY = (int)(height
+                * GestureStrokeRecognitionPoints.EXTRA_GESTURE_TRAIL_AREA_ABOVE_KEYBOARD_RATIO);
         mOffscreenWidth = width;
         mOffscreenHeight = mOffscreenOffsetY + height;
     }
 
     @Override
-    public void onDetachFromWindow() {
-        freeOffscreenBuffer();
-    }
-
-    public void deallocateMemory() {
+    public void onDeallocateMemory() {
         freeOffscreenBuffer();
     }
 
@@ -144,9 +143,9 @@
             // Trails count == fingers count that have ever been active.
             final int trailsCount = mGestureTrails.size();
             for (int index = 0; index < trailsCount; index++) {
-                final GestureTrail trail = mGestureTrails.valueAt(index);
+                final GestureTrailDrawingPoints trail = mGestureTrails.valueAt(index);
                 needsUpdatingGestureTrail |= trail.drawGestureTrail(offscreenCanvas, paint,
-                        mGestureTrailBoundsRect, mGestureTrailParams);
+                        mGestureTrailBoundsRect, mDrawingParams);
                 // {@link #mGestureTrailBoundsRect} has bounding box of the trail.
                 dirtyRect.union(mGestureTrailBoundsRect);
             }
@@ -189,15 +188,15 @@
         if (!isPreviewEnabled()) {
             return;
         }
-        GestureTrail trail;
+        GestureTrailDrawingPoints trail;
         synchronized (mGestureTrails) {
             trail = mGestureTrails.get(tracker.mPointerId);
             if (trail == null) {
-                trail = new GestureTrail();
+                trail = new GestureTrailDrawingPoints();
                 mGestureTrails.put(tracker.mPointerId, trail);
             }
         }
-        trail.addStroke(tracker.getGestureStrokeWithPreviewPoints(), tracker.getDownTime());
+        trail.addStroke(tracker.getGestureStrokeDrawingPoints(), tracker.getDownTime());
 
         // TODO: Should narrow the invalidate region.
         getDrawingView().invalidate();
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeySpecParser.java b/java/src/com/android/inputmethod/keyboard/internal/KeySpecParser.java
index 22f5b3d..accfaed 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeySpecParser.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeySpecParser.java
@@ -78,10 +78,10 @@
      * or has no key specifications.
      */
     public static String[] splitKeySpecs(final String text) {
-        final int size = text.length();
-        if (size == 0) {
+        if (TextUtils.isEmpty(text)) {
             return null;
         }
+        final int size = text.length();
         // Optimization for one-letter key specification.
         if (size == 1) {
             return text.charAt(0) == COMMA ? null : new String[] { text };
@@ -380,6 +380,9 @@
 
     public static String resolveTextReference(final String rawText,
             final KeyboardTextsSet textsSet) {
+        if (TextUtils.isEmpty(rawText)) {
+            return null;
+        }
         int level = 0;
         String text = rawText;
         StringBuilder sb;
@@ -392,7 +395,7 @@
             final int prefixLen = PREFIX_TEXT.length();
             final int size = text.length();
             if (size < prefixLen) {
-                return text;
+                return TextUtils.isEmpty(text) ? null : text;
             }
 
             sb = null;
@@ -421,7 +424,7 @@
                 text = sb.toString();
             }
         } while (sb != null);
-        return text;
+        return TextUtils.isEmpty(text) ? null : text;
     }
 
     private static int searchTextNameEnd(final String text, final int start) {
@@ -483,7 +486,7 @@
     public static int toUpperCaseOfCodeForLocale(final int code, final boolean needsToUpperCase,
             final Locale locale) {
         if (!Constants.isLetterCode(code) || !needsToUpperCase) return code;
-        final String text = new String(new int[] { code } , 0, 1);
+        final String text = StringUtils.newSingleCodePointString(code);
         final String casedText = KeySpecParser.toUpperCaseOfStringForLocale(
                 text, needsToUpperCase, locale);
         return StringUtils.codePointCount(casedText) == 1
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyStylesSet.java b/java/src/com/android/inputmethod/keyboard/internal/KeyStylesSet.java
index 05d855e..f7e43a6 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyStylesSet.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyStylesSet.java
@@ -27,6 +27,7 @@
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 
+import java.util.Arrays;
 import java.util.HashMap;
 
 public final class KeyStylesSet {
@@ -90,7 +91,8 @@
             }
             final Object value = mStyleAttributes.get(index);
             if (value != null) {
-                return (String[])value;
+                final String[] array = (String[])value;
+                return Arrays.copyOf(array, array.length);
             }
             final KeyStyle parentStyle = mStyles.get(mParentStyleName);
             return parentStyle.getStringArray(a, index);
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyVisualAttributes.java b/java/src/com/android/inputmethod/keyboard/internal/KeyVisualAttributes.java
index 8bdad36..c3e0aa6 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyVisualAttributes.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyVisualAttributes.java
@@ -47,6 +47,8 @@
     public final int mShiftedLetterHintActivatedColor;
     public final int mPreviewTextColor;
 
+    public final float mHintLabelVerticalAdjustment;
+
     private static final int[] VISUAL_ATTRIBUTE_IDS = {
         R.styleable.Keyboard_Key_keyTypeface,
         R.styleable.Keyboard_Key_keyLetterSize,
@@ -65,6 +67,7 @@
         R.styleable.Keyboard_Key_keyShiftedLetterHintInactivatedColor,
         R.styleable.Keyboard_Key_keyShiftedLetterHintActivatedColor,
         R.styleable.Keyboard_Key_keyPreviewTextColor,
+        R.styleable.Keyboard_Key_keyHintLabelVerticalAdjustment,
     };
     private static final SparseIntArray sVisualAttributeIds = new SparseIntArray();
     private static final int ATTR_DEFINED = 1;
@@ -127,5 +130,8 @@
         mShiftedLetterHintActivatedColor = keyAttr.getColor(
                 R.styleable.Keyboard_Key_keyShiftedLetterHintActivatedColor, 0);
         mPreviewTextColor = keyAttr.getColor(R.styleable.Keyboard_Key_keyPreviewTextColor, 0);
+
+        mHintLabelVerticalAdjustment = ResourceUtils.getFraction(keyAttr,
+                R.styleable.Keyboard_Key_keyHintLabelVerticalAdjustment, 0.0f);
     }
 }
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
index c1ae656..b31358f 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardBuilder.java
@@ -459,7 +459,7 @@
                 final int x = (int)row.getKeyX(null);
                 final int y = row.getKeyY();
                 final Key key = new Key(mParams, label, null /* hintLabel */, 0 /* iconId */,
-                        code, outputText, x, y, (int)keyWidth, (int)row.getRowHeight(),
+                        code, outputText, x, y, (int)keyWidth, row.getRowHeight(),
                         row.getDefaultKeyLabelFlags(), row.getDefaultBackgroundType());
                 endKey(key);
                 row.advanceXPos(keyWidth);
@@ -649,10 +649,9 @@
                     R.styleable.Keyboard_Case_passwordInput, id.passwordInput());
             final boolean clobberSettingsKeyMatched = matchBoolean(caseAttr,
                     R.styleable.Keyboard_Case_clobberSettingsKey, id.mClobberSettingsKey);
-            final boolean shortcutKeyEnabledMatched = matchBoolean(caseAttr,
-                    R.styleable.Keyboard_Case_shortcutKeyEnabled, id.mShortcutKeyEnabled);
-            final boolean shortcutKeyOnSymbolsMatched = matchBoolean(caseAttr,
-                    R.styleable.Keyboard_Case_shortcutKeyOnSymbols, id.mShortcutKeyOnSymbols);
+            final boolean supportsSwitchingToShortcutImeMatched = matchBoolean(caseAttr,
+                    R.styleable.Keyboard_Case_supportsSwitchingToShortcutIme,
+                    id.mSupportsSwitchingToShortcutIme);
             final boolean hasShortcutKeyMatched = matchBoolean(caseAttr,
                     R.styleable.Keyboard_Case_hasShortcutKey, id.mHasShortcutKey);
             final boolean languageSwitchKeyEnabledMatched = matchBoolean(caseAttr,
@@ -671,13 +670,12 @@
             final boolean selected = keyboardLayoutSetMatched && keyboardLayoutSetElementMatched
                     && modeMatched && navigateNextMatched && navigatePreviousMatched
                     && passwordInputMatched && clobberSettingsKeyMatched
-                    && shortcutKeyEnabledMatched && shortcutKeyOnSymbolsMatched
-                    && hasShortcutKeyMatched && languageSwitchKeyEnabledMatched
-                    && isMultiLineMatched && imeActionMatched && localeCodeMatched
-                    && languageCodeMatched && countryCodeMatched;
+                    && supportsSwitchingToShortcutImeMatched && hasShortcutKeyMatched
+                    && languageSwitchKeyEnabledMatched && isMultiLineMatched && imeActionMatched
+                    && localeCodeMatched && languageCodeMatched && countryCodeMatched;
 
             if (DEBUG) {
-                startTag("<%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s>%s", TAG_CASE,
+                startTag("<%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s>%s", TAG_CASE,
                         textAttr(caseAttr.getString(
                                 R.styleable.Keyboard_Case_keyboardLayoutSet), "keyboardLayoutSet"),
                         textAttr(caseAttr.getString(
@@ -694,10 +692,9 @@
                                 "clobberSettingsKey"),
                         booleanAttr(caseAttr, R.styleable.Keyboard_Case_passwordInput,
                                 "passwordInput"),
-                        booleanAttr(caseAttr, R.styleable.Keyboard_Case_shortcutKeyEnabled,
-                                "shortcutKeyEnabled"),
-                        booleanAttr(caseAttr, R.styleable.Keyboard_Case_shortcutKeyOnSymbols,
-                                "shortcutKeyOnSymbols"),
+                        booleanAttr(
+                                caseAttr, R.styleable.Keyboard_Case_supportsSwitchingToShortcutIme,
+                                "supportsSwitchingToShortcutIme"),
                         booleanAttr(caseAttr, R.styleable.Keyboard_Case_hasShortcutKey,
                                 "hasShortcutKey"),
                         booleanAttr(caseAttr, R.styleable.Keyboard_Case_languageSwitchKeyEnabled,
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardIconsSet.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardIconsSet.java
index 336db18..0ee935f 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardIconsSet.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardIconsSet.java
@@ -48,7 +48,6 @@
         "search_key",                   R.styleable.Keyboard_iconSearchKey,
         "tab_key",                      R.styleable.Keyboard_iconTabKey,
         "shortcut_key",                 R.styleable.Keyboard_iconShortcutKey,
-        "shortcut_for_label",           R.styleable.Keyboard_iconShortcutForLabel,
         "space_key_for_number_layout",  R.styleable.Keyboard_iconSpaceKeyForNumberLayout,
         "shift_key_shifted",            R.styleable.Keyboard_iconShiftKeyShifted,
         "shortcut_key_disabled",        R.styleable.Keyboard_iconShortcutKeyDisabled,
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java
index dd98c17..0c80ce2 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardState.java
@@ -304,6 +304,7 @@
         mSwitchActions.setSymbolsKeyboard();
         mIsAlphabetMode = false;
         mIsSymbolShifted = false;
+        mRecapitalizeMode = RecapitalizeStatus.NOT_A_RECAPITALIZE_MODE;
         // Reset alphabet shift state.
         mAlphabetShiftState.setShiftLocked(false);
         mSwitchState = SWITCH_STATE_SYMBOL_BEGIN;
@@ -316,6 +317,7 @@
         mSwitchActions.setSymbolsShiftedKeyboard();
         mIsAlphabetMode = false;
         mIsSymbolShifted = true;
+        mRecapitalizeMode = RecapitalizeStatus.NOT_A_RECAPITALIZE_MODE;
         // Reset alphabet shift state.
         mAlphabetShiftState.setShiftLocked(false);
         mSwitchState = SWITCH_STATE_SYMBOL_BEGIN;
@@ -327,6 +329,7 @@
         }
         mIsAlphabetMode = false;
         mIsEmojiMode = true;
+        mRecapitalizeMode = RecapitalizeStatus.NOT_A_RECAPITALIZE_MODE;
         // Remember caps lock mode and reset alphabet shift state.
         mPrevMainKeyboardWasShiftLocked = mAlphabetShiftState.isShiftLocked();
         mAlphabetShiftState.setShiftLocked(false);
diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
index c2a01b5..9f33fcc 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
@@ -87,11 +87,11 @@
         return (text == null) ? LANGUAGE_DEFAULT[id] : text;
     }
 
+    // These texts' name should be aligned with the @string/<name> in
+    // values*/strings-action-keys.xml.
     private static final String[] RESOURCE_NAMES = {
-        // These texts' name should be aligned with the @string/<name> in values/strings.xml.
         // Labels for action.
         "label_go_key",
-        // "label_search_key",
         "label_send_key",
         "label_next_key",
         "label_done_key",
@@ -147,111 +147,118 @@
         /* 42 */ "keylabel_for_south_slavic_row3_8",
         /* 43 */ "more_keys_for_cyrillic_ie",
         /* 44 */ "more_keys_for_cyrillic_i",
-        /* 45 */ "label_to_alpha_key",
-        /* 46 */ "single_quotes",
-        /* 47 */ "double_quotes",
-        /* 48 */ "single_angle_quotes",
-        /* 49 */ "double_angle_quotes",
-        /* 50 */ "more_keys_for_currency_dollar",
-        /* 51 */ "keylabel_for_currency",
-        /* 52 */ "more_keys_for_currency",
-        /* 53 */ "more_keys_for_punctuation",
-        /* 54 */ "more_keys_for_star",
-        /* 55 */ "more_keys_for_bullet",
-        /* 56 */ "more_keys_for_plus",
-        /* 57 */ "more_keys_for_left_parenthesis",
-        /* 58 */ "more_keys_for_right_parenthesis",
-        /* 59 */ "more_keys_for_less_than",
-        /* 60 */ "more_keys_for_greater_than",
-        /* 61 */ "more_keys_for_arabic_diacritics",
-        /* 62 */ "keyhintlabel_for_arabic_diacritics",
-        /* 63 */ "keylabel_for_symbols_1",
-        /* 64 */ "keylabel_for_symbols_2",
-        /* 65 */ "keylabel_for_symbols_3",
-        /* 66 */ "keylabel_for_symbols_4",
-        /* 67 */ "keylabel_for_symbols_5",
-        /* 68 */ "keylabel_for_symbols_6",
-        /* 69 */ "keylabel_for_symbols_7",
-        /* 70 */ "keylabel_for_symbols_8",
-        /* 71 */ "keylabel_for_symbols_9",
-        /* 72 */ "keylabel_for_symbols_0",
-        /* 73 */ "label_to_symbol_key",
-        /* 74 */ "label_to_symbol_with_microphone_key",
-        /* 75 */ "additional_more_keys_for_symbols_1",
-        /* 76 */ "additional_more_keys_for_symbols_2",
-        /* 77 */ "additional_more_keys_for_symbols_3",
-        /* 78 */ "additional_more_keys_for_symbols_4",
-        /* 79 */ "additional_more_keys_for_symbols_5",
-        /* 80 */ "additional_more_keys_for_symbols_6",
-        /* 81 */ "additional_more_keys_for_symbols_7",
-        /* 82 */ "additional_more_keys_for_symbols_8",
-        /* 83 */ "additional_more_keys_for_symbols_9",
-        /* 84 */ "additional_more_keys_for_symbols_0",
-        /* 85 */ "more_keys_for_symbols_1",
-        /* 86 */ "more_keys_for_symbols_2",
-        /* 87 */ "more_keys_for_symbols_3",
-        /* 88 */ "more_keys_for_symbols_4",
-        /* 89 */ "more_keys_for_symbols_5",
-        /* 90 */ "more_keys_for_symbols_6",
-        /* 91 */ "more_keys_for_symbols_7",
-        /* 92 */ "more_keys_for_symbols_8",
-        /* 93 */ "more_keys_for_symbols_9",
-        /* 94 */ "more_keys_for_symbols_0",
-        /* 95 */ "keylabel_for_comma",
-        /* 96 */ "more_keys_for_comma",
-        /* 97 */ "keylabel_for_symbols_question",
-        /* 98 */ "keylabel_for_symbols_semicolon",
-        /* 99 */ "keylabel_for_symbols_percent",
-        /* 100 */ "more_keys_for_symbols_exclamation",
-        /* 101 */ "more_keys_for_symbols_question",
-        /* 102 */ "more_keys_for_symbols_semicolon",
-        /* 103 */ "more_keys_for_symbols_percent",
-        /* 104 */ "keylabel_for_tablet_comma",
-        /* 105 */ "keyhintlabel_for_tablet_comma",
-        /* 106 */ "more_keys_for_tablet_comma",
+        /* 45 */ "keylabel_for_swiss_row1_11",
+        /* 46 */ "keylabel_for_swiss_row2_10",
+        /* 47 */ "keylabel_for_swiss_row2_11",
+        /* 48 */ "more_keys_for_swiss_row1_11",
+        /* 49 */ "more_keys_for_swiss_row2_10",
+        /* 50 */ "more_keys_for_swiss_row2_11",
+        /* 51 */ "label_to_alpha_key",
+        /* 52 */ "single_quotes",
+        /* 53 */ "double_quotes",
+        /* 54 */ "single_angle_quotes",
+        /* 55 */ "double_angle_quotes",
+        /* 56 */ "more_keys_for_currency_dollar",
+        /* 57 */ "keylabel_for_currency",
+        /* 58 */ "more_keys_for_currency",
+        /* 59 */ "more_keys_for_punctuation",
+        /* 60 */ "more_keys_for_tablet_punctuation",
+        /* 61 */ "more_keys_for_star",
+        /* 62 */ "more_keys_for_bullet",
+        /* 63 */ "more_keys_for_plus",
+        /* 64 */ "more_keys_for_left_parenthesis",
+        /* 65 */ "more_keys_for_right_parenthesis",
+        /* 66 */ "more_keys_for_less_than",
+        /* 67 */ "more_keys_for_greater_than",
+        /* 68 */ "more_keys_for_arabic_diacritics",
+        /* 69 */ "keylabel_for_symbols_1",
+        /* 70 */ "keylabel_for_symbols_2",
+        /* 71 */ "keylabel_for_symbols_3",
+        /* 72 */ "keylabel_for_symbols_4",
+        /* 73 */ "keylabel_for_symbols_5",
+        /* 74 */ "keylabel_for_symbols_6",
+        /* 75 */ "keylabel_for_symbols_7",
+        /* 76 */ "keylabel_for_symbols_8",
+        /* 77 */ "keylabel_for_symbols_9",
+        /* 78 */ "keylabel_for_symbols_0",
+        /* 79 */ "label_to_symbol_key",
+        /* 80 */ "label_to_symbol_with_microphone_key",
+        /* 81 */ "additional_more_keys_for_symbols_1",
+        /* 82 */ "additional_more_keys_for_symbols_2",
+        /* 83 */ "additional_more_keys_for_symbols_3",
+        /* 84 */ "additional_more_keys_for_symbols_4",
+        /* 85 */ "additional_more_keys_for_symbols_5",
+        /* 86 */ "additional_more_keys_for_symbols_6",
+        /* 87 */ "additional_more_keys_for_symbols_7",
+        /* 88 */ "additional_more_keys_for_symbols_8",
+        /* 89 */ "additional_more_keys_for_symbols_9",
+        /* 90 */ "additional_more_keys_for_symbols_0",
+        /* 91 */ "more_keys_for_symbols_1",
+        /* 92 */ "more_keys_for_symbols_2",
+        /* 93 */ "more_keys_for_symbols_3",
+        /* 94 */ "more_keys_for_symbols_4",
+        /* 95 */ "more_keys_for_symbols_5",
+        /* 96 */ "more_keys_for_symbols_6",
+        /* 97 */ "more_keys_for_symbols_7",
+        /* 98 */ "more_keys_for_symbols_8",
+        /* 99 */ "more_keys_for_symbols_9",
+        /* 100 */ "more_keys_for_symbols_0",
+        /* 101 */ "keylabel_for_comma",
+        /* 102 */ "more_keys_for_comma",
+        /* 103 */ "keylabel_for_tablet_comma",
+        /* 104 */ "keyhintlabel_for_tablet_comma",
+        /* 105 */ "more_keys_for_tablet_comma",
+        /* 106 */ "keylabel_for_period",
         /* 107 */ "keyhintlabel_for_period",
         /* 108 */ "more_keys_for_period",
-        /* 109 */ "keylabel_for_apostrophe",
-        /* 110 */ "keyhintlabel_for_apostrophe",
-        /* 111 */ "more_keys_for_apostrophe",
-        /* 112 */ "more_keys_for_q",
-        /* 113 */ "more_keys_for_x",
-        /* 114 */ "keylabel_for_q",
-        /* 115 */ "keylabel_for_w",
-        /* 116 */ "keylabel_for_y",
-        /* 117 */ "keylabel_for_x",
-        /* 118 */ "keylabel_for_spanish_row2_10",
-        /* 119 */ "more_keys_for_am_pm",
-        /* 120 */ "settings_as_more_key",
-        /* 121 */ "shortcut_as_more_key",
-        /* 122 */ "action_next_as_more_key",
-        /* 123 */ "action_previous_as_more_key",
-        /* 124 */ "label_to_more_symbol_key",
-        /* 125 */ "label_to_more_symbol_for_tablet_key",
-        /* 126 */ "label_tab_key",
-        /* 127 */ "label_to_phone_numeric_key",
-        /* 128 */ "label_to_phone_symbols_key",
-        /* 129 */ "label_time_am",
-        /* 130 */ "label_time_pm",
-        /* 131 */ "keylabel_for_popular_domain",
-        /* 132 */ "more_keys_for_popular_domain",
-        /* 133 */ "more_keys_for_smiley",
-        /* 134 */ "single_laqm_raqm",
-        /* 135 */ "single_laqm_raqm_rtl",
-        /* 136 */ "single_raqm_laqm",
-        /* 137 */ "double_laqm_raqm",
-        /* 138 */ "double_laqm_raqm_rtl",
-        /* 139 */ "double_raqm_laqm",
-        /* 140 */ "single_lqm_rqm",
-        /* 141 */ "single_9qm_lqm",
-        /* 142 */ "single_9qm_rqm",
-        /* 143 */ "double_lqm_rqm",
-        /* 144 */ "double_9qm_lqm",
-        /* 145 */ "double_9qm_rqm",
-        /* 146 */ "more_keys_for_single_quote",
-        /* 147 */ "more_keys_for_double_quote",
-        /* 148 */ "more_keys_for_tablet_double_quote",
-        /* 149 */ "emoji_key_as_more_key",
+        /* 109 */ "keylabel_for_tablet_period",
+        /* 110 */ "keyhintlabel_for_tablet_period",
+        /* 111 */ "more_keys_for_tablet_period",
+        /* 112 */ "keylabel_for_symbols_question",
+        /* 113 */ "keylabel_for_symbols_semicolon",
+        /* 114 */ "keylabel_for_symbols_percent",
+        /* 115 */ "more_keys_for_exclamation",
+        /* 116 */ "more_keys_for_question",
+        /* 117 */ "more_keys_for_symbols_semicolon",
+        /* 118 */ "more_keys_for_symbols_percent",
+        /* 119 */ "more_keys_for_q",
+        /* 120 */ "more_keys_for_x",
+        /* 121 */ "keylabel_for_q",
+        /* 122 */ "keylabel_for_w",
+        /* 123 */ "keylabel_for_y",
+        /* 124 */ "keylabel_for_x",
+        /* 125 */ "keylabel_for_spanish_row2_10",
+        /* 126 */ "more_keys_for_am_pm",
+        /* 127 */ "settings_as_more_key",
+        /* 128 */ "shortcut_as_more_key",
+        /* 129 */ "action_next_as_more_key",
+        /* 130 */ "action_previous_as_more_key",
+        /* 131 */ "label_to_more_symbol_key",
+        /* 132 */ "label_to_more_symbol_for_tablet_key",
+        /* 133 */ "label_tab_key",
+        /* 134 */ "label_to_phone_numeric_key",
+        /* 135 */ "label_to_phone_symbols_key",
+        /* 136 */ "label_time_am",
+        /* 137 */ "label_time_pm",
+        /* 138 */ "keylabel_for_popular_domain",
+        /* 139 */ "more_keys_for_popular_domain",
+        /* 140 */ "more_keys_for_smiley",
+        /* 141 */ "single_laqm_raqm",
+        /* 142 */ "single_laqm_raqm_rtl",
+        /* 143 */ "single_raqm_laqm",
+        /* 144 */ "double_laqm_raqm",
+        /* 145 */ "double_laqm_raqm_rtl",
+        /* 146 */ "double_raqm_laqm",
+        /* 147 */ "single_lqm_rqm",
+        /* 148 */ "single_9qm_lqm",
+        /* 149 */ "single_9qm_rqm",
+        /* 150 */ "double_lqm_rqm",
+        /* 151 */ "double_9qm_lqm",
+        /* 152 */ "double_9qm_rqm",
+        /* 153 */ "more_keys_for_single_quote",
+        /* 154 */ "more_keys_for_double_quote",
+        /* 155 */ "more_keys_for_tablet_double_quote",
+        /* 156 */ "emoji_key_as_more_key",
     };
 
     private static final String EMPTY = "";
@@ -262,145 +269,148 @@
         EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY,
         EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY,
         EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY,
-        EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY,
-        /* ~44 */
+        EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
-        /* 45 */ "ABC",
-        /* 46 */ "!text/single_lqm_rqm",
-        /* 47 */ "!text/double_lqm_rqm",
-        /* 48 */ "!text/single_laqm_raqm",
-        /* 49 */ "!text/double_laqm_raqm",
+        /* 51 */ "ABC",
+        /* 52 */ "!text/single_lqm_rqm",
+        /* 53 */ "!text/double_lqm_rqm",
+        /* 54 */ "!text/single_laqm_raqm",
+        /* 55 */ "!text/double_laqm_raqm",
         // U+00A2: "¢" CENT SIGN
         // U+00A3: "£" POUND SIGN
         // U+20AC: "€" EURO SIGN
         // U+00A5: "¥" YEN SIGN
         // U+20B1: "₱" PESO SIGN
-        /* 50 */ "\u00A2,\u00A3,\u20AC,\u00A5,\u20B1",
-        /* 51 */ "$",
-        /* 52 */ "$,\u00A2,\u20AC,\u00A3,\u00A5,\u20B1",
-        /* 53 */ "!fixedColumnOrder!8,;,/,(,),#,!,\\,,?,&,\\%,+,\",-,:,',@",
+        /* 56 */ "\u00A2,\u00A3,\u20AC,\u00A5,\u20B1",
+        /* 57 */ "$",
+        /* 58 */ "$,\u00A2,\u20AC,\u00A3,\u00A5,\u20B1",
+        /* 59 */ "!fixedColumnOrder!8,;,/,(,),#,!,\\,,?,&,\\%,+,\",-,:,',@",
+        /* 60 */ "!fixedColumnOrder!7,;,/,(,),#,',\\,,&,\\%,+,\",-,:,@",
         // U+2020: "†" DAGGER
         // U+2021: "‡" DOUBLE DAGGER
         // U+2605: "★" BLACK STAR
-        /* 54 */ "\u2020,\u2021,\u2605",
+        /* 61 */ "\u2020,\u2021,\u2605",
         // U+266A: "♪" EIGHTH NOTE
         // U+2665: "♥" BLACK HEART SUIT
         // U+2660: "♠" BLACK SPADE SUIT
         // U+2666: "♦" BLACK DIAMOND SUIT
         // U+2663: "♣" BLACK CLUB SUIT
-        /* 55 */ "\u266A,\u2665,\u2660,\u2666,\u2663",
+        /* 62 */ "\u266A,\u2665,\u2660,\u2666,\u2663",
         // U+00B1: "±" PLUS-MINUS SIGN
-        /* 56 */ "\u00B1",
+        /* 63 */ "\u00B1",
         // The all letters need to be mirrored are found at
         // http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt
-        /* 57 */ "!fixedColumnOrder!3,<,{,[",
-        /* 58 */ "!fixedColumnOrder!3,>,},]",
+        /* 64 */ "!fixedColumnOrder!3,<,{,[",
+        /* 65 */ "!fixedColumnOrder!3,>,},]",
         // U+2039: "‹" SINGLE LEFT-POINTING ANGLE QUOTATION MARK
         // U+203A: "›" SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
         // U+2264: "≤" LESS-THAN OR EQUAL TO
         // U+2265: "≥" GREATER-THAN EQUAL TO
         // U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+00BB: "»" RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
-        /* 59 */ "!fixedColumnOrder!3,\u2039,\u2264,\u00AB",
-        /* 60 */ "!fixedColumnOrder!3,\u203A,\u2265,\u00BB",
-        /* 61 */ EMPTY,
-        /* 62 */ EMPTY,
-        /* 63 */ "1",
-        /* 64 */ "2",
-        /* 65 */ "3",
-        /* 66 */ "4",
-        /* 67 */ "5",
-        /* 68 */ "6",
-        /* 69 */ "7",
-        /* 70 */ "8",
-        /* 71 */ "9",
-        /* 72 */ "0",
+        /* 66 */ "!fixedColumnOrder!3,\u2039,\u2264,\u00AB",
+        /* 67 */ "!fixedColumnOrder!3,\u203A,\u2265,\u00BB",
+        /* 68 */ EMPTY,
+        /* 69 */ "1",
+        /* 70 */ "2",
+        /* 71 */ "3",
+        /* 72 */ "4",
+        /* 73 */ "5",
+        /* 74 */ "6",
+        /* 75 */ "7",
+        /* 76 */ "8",
+        /* 77 */ "9",
+        /* 78 */ "0",
         // Label for "switch to symbols" key.
-        /* 73 */ "?123",
+        /* 79 */ "?123",
         // Label for "switch to symbols with microphone" key. This string shouldn't include the "mic"
         // part because it'll be appended by the code.
-        /* 74 */ "123",
-        /* 75~ */
+        /* 80 */ "123",
+        /* 81~ */
         EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY, EMPTY,
-        /* ~84 */
+        /* ~90 */
         // U+00B9: "¹" SUPERSCRIPT ONE
         // U+00BD: "½" VULGAR FRACTION ONE HALF
         // U+2153: "⅓" VULGAR FRACTION ONE THIRD
         // U+00BC: "¼" VULGAR FRACTION ONE QUARTER
         // U+215B: "⅛" VULGAR FRACTION ONE EIGHTH
-        /* 85 */ "\u00B9,\u00BD,\u2153,\u00BC,\u215B",
+        /* 91 */ "\u00B9,\u00BD,\u2153,\u00BC,\u215B",
         // U+00B2: "²" SUPERSCRIPT TWO
         // U+2154: "⅔" VULGAR FRACTION TWO THIRDS
-        /* 86 */ "\u00B2,\u2154",
+        /* 92 */ "\u00B2,\u2154",
         // U+00B3: "³" SUPERSCRIPT THREE
         // U+00BE: "¾" VULGAR FRACTION THREE QUARTERS
         // U+215C: "⅜" VULGAR FRACTION THREE EIGHTHS
-        /* 87 */ "\u00B3,\u00BE,\u215C",
+        /* 93 */ "\u00B3,\u00BE,\u215C",
         // U+2074: "⁴" SUPERSCRIPT FOUR
-        /* 88 */ "\u2074",
+        /* 94 */ "\u2074",
         // U+215D: "⅝" VULGAR FRACTION FIVE EIGHTHS
-        /* 89 */ "\u215D",
-        /* 90 */ EMPTY,
+        /* 95 */ "\u215D",
+        /* 96 */ EMPTY,
         // U+215E: "⅞" VULGAR FRACTION SEVEN EIGHTHS
-        /* 91 */ "\u215E",
-        /* 92 */ EMPTY,
-        /* 93 */ EMPTY,
+        /* 97 */ "\u215E",
+        /* 98 */ EMPTY,
+        /* 99 */ EMPTY,
         // U+207F: "ⁿ" SUPERSCRIPT LATIN SMALL LETTER N
         // U+2205: "∅" EMPTY SET
-        /* 94 */ "\u207F,\u2205",
-        /* 95 */ ",",
-        /* 96 */ EMPTY,
-        /* 97 */ "?",
-        /* 98 */ ";",
-        /* 99 */ "%",
-        // U+00A1: "¡" INVERTED EXCLAMATION MARK
-        /* 100 */ "\u00A1",
-        // U+00BF: "¿" INVERTED QUESTION MARK
-        /* 101 */ "\u00BF",
+        /* 100 */ "\u207F,\u2205",
+        // Comma key
+        /* 101 */ ",",
         /* 102 */ EMPTY,
+        /* 103 */ ",",
+        /* 104 */ EMPTY,
+        /* 105 */ EMPTY,
+        // Period key
+        /* 106 */ ".",
+        /* 107 */ EMPTY,
+        /* 108 */ "!text/more_keys_for_punctuation",
+        /* 109 */ ".",
+        /* 110 */ EMPTY,
+        /* 111 */ "!text/more_keys_for_tablet_punctuation",
+        /* 112 */ "?",
+        /* 113 */ ";",
+        /* 114 */ "%",
+        // U+00A1: "¡" INVERTED EXCLAMATION MARK
+        /* 115 */ "\u00A1",
+        // U+00BF: "¿" INVERTED QUESTION MARK
+        /* 116 */ "\u00BF",
+        /* 117 */ EMPTY,
         // U+2030: "‰" PER MILLE SIGN
-        /* 103 */ "\u2030",
-        /* 104 */ ",",
-        /* 105~ */
-        EMPTY, EMPTY, EMPTY,
-        /* ~107 */
-        // U+2026: "…" HORIZONTAL ELLIPSIS
-        /* 108 */ "\u2026",
-        /* 109 */ "\'",
-        /* 110 */ "\"",
-        /* 111 */ "\"",
-        /* 112 */ EMPTY,
-        /* 113 */ EMPTY,
-        /* 114 */ "q",
-        /* 115 */ "w",
-        /* 116 */ "y",
-        /* 117 */ "x",
-        /* 118 */ EMPTY,
-        /* 119 */ "!fixedColumnOrder!2,!hasLabels!,!text/label_time_am,!text/label_time_pm",
-        /* 120 */ "!icon/settings_key|!code/key_settings",
-        /* 121 */ "!icon/shortcut_key|!code/key_shortcut",
-        /* 122 */ "!hasLabels!,!text/label_next_key|!code/key_action_next",
-        /* 123 */ "!hasLabels!,!text/label_previous_key|!code/key_action_previous",
+        /* 118 */ "\u2030",
+        /* 119 */ EMPTY,
+        /* 120 */ EMPTY,
+        /* 121 */ "q",
+        /* 122 */ "w",
+        /* 123 */ "y",
+        /* 124 */ "x",
+        // U+00F1: "ñ" LATIN SMALL LETTER N WITH TILDE
+        /* 125 */ "\u00F1",
+        /* 126 */ "!fixedColumnOrder!2,!hasLabels!,!text/label_time_am,!text/label_time_pm",
+        /* 127 */ "!icon/settings_key|!code/key_settings",
+        /* 128 */ "!icon/shortcut_key|!code/key_shortcut",
+        /* 129 */ "!hasLabels!,!text/label_next_key|!code/key_action_next",
+        /* 130 */ "!hasLabels!,!text/label_previous_key|!code/key_action_previous",
         // Label for "switch to more symbol" modifier key.  Must be short to fit on key!
-        /* 124 */ "= \\ <",
+        /* 131 */ "= \\ <",
         // Label for "switch to more symbol" modifier key on tablets.  Must be short to fit on key!
-        /* 125 */ "~ [ <",
+        /* 132 */ "~ [ <",
         // Label for "Tab" key.  Must be short to fit on key!
-        /* 126 */ "Tab",
+        /* 133 */ "Tab",
         // Label for "switch to phone numeric" key.  Must be short to fit on key!
-        /* 127 */ "123",
+        /* 134 */ "123",
         // Label for "switch to phone symbols" key.  Must be short to fit on key!
         // U+FF0A: "＊" FULLWIDTH ASTERISK
         // U+FF03: "＃" FULLWIDTH NUMBER SIGN
-        /* 128 */ "\uFF0A\uFF03",
+        /* 135 */ "\uFF0A\uFF03",
         // Key label for "ante meridiem"
-        /* 129 */ "AM",
+        /* 136 */ "AM",
         // Key label for "post meridiem"
-        /* 130 */ "PM",
-        /* 131 */ ".com",
+        /* 137 */ "PM",
+        /* 138 */ ".com",
         // popular web domains for the locale - most popular, displayed on the keyboard
-        /* 132 */ "!hasLabels!,.net,.org,.gov,.edu",
-        /* 133 */ "!fixedColumnOrder!5,!hasLabels!,=-O|=-O ,:-P|:-P ,;-)|;-) ,:-(|:-( ,:-)|:-) ,:-!|:-! ,:-$|:-$ ,B-)|B-) ,:O|:O ,:-*|:-* ,:-D|:-D ,:\'(|:\'( ,:-\\\\|:-\\\\ ,O:-)|O:-) ,:-[|:-[ ",
+        /* 139 */ "!hasLabels!,.net,.org,.gov,.edu",
+        /* 140 */ "!fixedColumnOrder!5,!hasLabels!,=-O|=-O ,:-P|:-P ,;-)|;-) ,:-(|:-( ,:-)|:-) ,:-!|:-! ,:-$|:-$ ,B-)|B-) ,:O|:O ,:-*|:-* ,:-D|:-D ,:\'(|:\'( ,:-\\\\|:-\\\\ ,O:-)|O:-) ,:-[|:-[ ",
         // U+2039: "‹" SINGLE LEFT-POINTING ANGLE QUOTATION MARK
         // U+203A: "›" SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
         // U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
@@ -422,25 +432,25 @@
         // The following each quotation mark pair consist of
         // <opening quotation mark>, <closing quotation mark>
         // and is named after (single|double)_<opening quotation mark>_<closing quotation mark>.
-        /* 134 */ "\u2039,\u203A",
-        /* 135 */ "\u2039|\u203A,\u203A|\u2039",
-        /* 136 */ "\u203A,\u2039",
-        /* 137 */ "\u00AB,\u00BB",
-        /* 138 */ "\u00AB|\u00BB,\u00BB|\u00AB",
-        /* 139 */ "\u00BB,\u00AB",
+        /* 141 */ "\u2039,\u203A",
+        /* 142 */ "\u2039|\u203A,\u203A|\u2039",
+        /* 143 */ "\u203A,\u2039",
+        /* 144 */ "\u00AB,\u00BB",
+        /* 145 */ "\u00AB|\u00BB,\u00BB|\u00AB",
+        /* 146 */ "\u00BB,\u00AB",
         // The following each quotation mark triplet consists of
         // <another quotation mark>, <opening quotation mark>, <closing quotation mark>
         // and is named after (single|double)_<opening quotation mark>_<closing quotation mark>.
-        /* 140 */ "\u201A,\u2018,\u2019",
-        /* 141 */ "\u2019,\u201A,\u2018",
-        /* 142 */ "\u2018,\u201A,\u2019",
-        /* 143 */ "\u201E,\u201C,\u201D",
-        /* 144 */ "\u201D,\u201E,\u201C",
-        /* 145 */ "\u201C,\u201E,\u201D",
-        /* 146 */ "!fixedColumnOrder!5,!text/single_quotes,!text/single_angle_quotes",
-        /* 147 */ "!fixedColumnOrder!5,!text/double_quotes,!text/double_angle_quotes",
-        /* 148 */ "!fixedColumnOrder!6,!text/double_quotes,!text/single_quotes,!text/double_angle_quotes,!text/single_angle_quotes",
-        /* 149 */ "!icon/emoji_key|!code/key_emoji",
+        /* 147 */ "\u201A,\u2018,\u2019",
+        /* 148 */ "\u2019,\u201A,\u2018",
+        /* 149 */ "\u2018,\u201A,\u2019",
+        /* 150 */ "\u201E,\u201C,\u201D",
+        /* 151 */ "\u201D,\u201E,\u201C",
+        /* 152 */ "\u201C,\u201E,\u201D",
+        /* 153 */ "!fixedColumnOrder!5,!text/single_quotes,!text/single_angle_quotes",
+        /* 154 */ "!fixedColumnOrder!5,!text/double_quotes,!text/double_angle_quotes",
+        /* 155 */ "!fixedColumnOrder!6,!text/double_quotes,!text/single_quotes,!text/double_angle_quotes,!text/single_angle_quotes",
+        /* 156 */ "!icon/emoji_key|!code/key_emoji",
     };
 
     /* Language af: Afrikaans */
@@ -502,44 +512,43 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0623: "ا" ARABIC LETTER ALEF
         // U+200C: ZERO WIDTH NON-JOINER
         // U+0628: "ب" ARABIC LETTER BEH
         // U+062C: "پ" ARABIC LETTER PEH
-        /* 45 */ "\u0623\u200C\u0628\u200C\u062C",
-        /* 46 */ null,
-        /* 47 */ null,
-        /* 48 */ "!text/single_laqm_raqm_rtl",
-        /* 49 */ "!text/double_laqm_raqm_rtl",
-        /* 50~ */
+        /* 51 */ "\u0623\u200C\u0628\u200C\u062C",
+        /* 52 */ null,
+        /* 53 */ null,
+        /* 54 */ "!text/single_laqm_raqm_rtl",
+        /* 55 */ "!text/double_laqm_raqm_rtl",
+        /* 56~ */
         null, null, null,
-        /* ~52 */
-        // U+061F: "؟" ARABIC QUESTION MARK
-        // U+060C: "،" ARABIC COMMA
-        // U+061B: "؛" ARABIC SEMICOLON
-        /* 53 */ "!fixedColumnOrder!8,\",\',#,-,:,!,\u060C,\u061F,@,&,\\%,+,\u061B,/,(|),)|(",
+        /* ~58 */
+        /* 59 */ "!fixedColumnOrder!8,\",\',#,-,:,!,\u060C,\u061F,@,&,\\%,+,\u061B,/,(|),)|(",
+        /* 60 */ null,
         // U+2605: "★" BLACK STAR
         // U+066D: "٭" ARABIC FIVE POINTED STAR
-        /* 54 */ "\u2605,\u066D",
+        /* 61 */ "\u2605,\u066D",
         // U+266A: "♪" EIGHTH NOTE
-        /* 55 */ "\u266A",
-        /* 56 */ null,
+        /* 62 */ "\u266A",
+        /* 63 */ null,
         // The all letters need to be mirrored are found at
         // http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt
         // U+FD3E: "﴾" ORNATE LEFT PARENTHESIS
         // U+FD3F: "﴿" ORNATE RIGHT PARENTHESIS
-        /* 57 */ "!fixedColumnOrder!4,\uFD3E|\uFD3F,<|>,{|},[|]",
-        /* 58 */ "!fixedColumnOrder!4,\uFD3F|\uFD3E,>|<,}|{,]|[",
+        /* 64 */ "!fixedColumnOrder!4,\uFD3E|\uFD3F,<|>,{|},[|]",
+        /* 65 */ "!fixedColumnOrder!4,\uFD3F|\uFD3E,>|<,}|{,]|[",
         // U+2264: "≤" LESS-THAN OR EQUAL TO
         // U+2265: "≥" GREATER-THAN EQUAL TO
         // U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+00BB: "»" RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+2039: "‹" SINGLE LEFT-POINTING ANGLE QUOTATION MARK
         // U+203A: "›" SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
-        /* 59 */ "!fixedColumnOrder!3,\u2039|\u203A,\u2264|\u2265,\u00AB|\u00BB",
-        /* 60 */ "!fixedColumnOrder!3,\u203A|\u2039,\u2265|\u2264,\u00BB|\u00AB",
+        /* 66 */ "!fixedColumnOrder!3,\u2039|\u203A,\u2264|\u2265,\u00AB|\u00BB",
+        /* 67 */ "!fixedColumnOrder!3,\u203A|\u2039,\u2265|\u2264,\u00BB|\u00AB",
         // U+0655: "ٕ" ARABIC HAMZA BELOW
         // U+0654: "ٔ" ARABIC HAMZA ABOVE
         // U+0652: "ْ" ARABIC SUKUN
@@ -556,74 +565,78 @@
         // U+0640: "ـ" ARABIC TATWEEL
         // In order to make Tatweel easily distinguishable from other punctuations, we use consecutive Tatweels only for its displayed label.
         // Note: The space character is needed as a preceding letter to draw Arabic diacritics characters correctly.
-        /* 61 */ "!fixedColumnOrder!7, \u0655|\u0655, \u0654|\u0654, \u0652|\u0652, \u064D|\u064D, \u064C|\u064C, \u064B|\u064B, \u0651|\u0651, \u0656|\u0656, \u0670|\u0670, \u0653|\u0653, \u0650|\u0650, \u064F|\u064F, \u064E|\u064E,\u0640\u0640\u0640|\u0640",
-        /* 62 */ "\u0651",
+        /* 68 */ "!fixedColumnOrder!7, \u0655|\u0655, \u0654|\u0654, \u0652|\u0652, \u064D|\u064D, \u064C|\u064C, \u064B|\u064B, \u0651|\u0651, \u0656|\u0656, \u0670|\u0670, \u0653|\u0653, \u0650|\u0650, \u064F|\u064F, \u064E|\u064E,\u0640\u0640\u0640|\u0640",
         // U+0661: "١" ARABIC-INDIC DIGIT ONE
-        /* 63 */ "\u0661",
+        /* 69 */ "\u0661",
         // U+0662: "٢" ARABIC-INDIC DIGIT TWO
-        /* 64 */ "\u0662",
+        /* 70 */ "\u0662",
         // U+0663: "٣" ARABIC-INDIC DIGIT THREE
-        /* 65 */ "\u0663",
+        /* 71 */ "\u0663",
         // U+0664: "٤" ARABIC-INDIC DIGIT FOUR
-        /* 66 */ "\u0664",
+        /* 72 */ "\u0664",
         // U+0665: "٥" ARABIC-INDIC DIGIT FIVE
-        /* 67 */ "\u0665",
+        /* 73 */ "\u0665",
         // U+0666: "٦" ARABIC-INDIC DIGIT SIX
-        /* 68 */ "\u0666",
+        /* 74 */ "\u0666",
         // U+0667: "٧" ARABIC-INDIC DIGIT SEVEN
-        /* 69 */ "\u0667",
+        /* 75 */ "\u0667",
         // U+0668: "٨" ARABIC-INDIC DIGIT EIGHT
-        /* 70 */ "\u0668",
+        /* 76 */ "\u0668",
         // U+0669: "٩" ARABIC-INDIC DIGIT NINE
-        /* 71 */ "\u0669",
+        /* 77 */ "\u0669",
         // U+0660: "٠" ARABIC-INDIC DIGIT ZERO
-        /* 72 */ "\u0660",
+        /* 78 */ "\u0660",
         // Label for "switch to symbols" key.
         // U+061F: "؟" ARABIC QUESTION MARK
-        /* 73 */ "\u0663\u0662\u0661\u061F",
+        /* 79 */ "\u0663\u0662\u0661\u061F",
         // Label for "switch to symbols with microphone" key. This string shouldn't include the "mic"
         // part because it'll be appended by the code.
-        /* 74 */ "\u0663\u0662\u0661",
-        /* 75 */ "1",
-        /* 76 */ "2",
-        /* 77 */ "3",
-        /* 78 */ "4",
-        /* 79 */ "5",
-        /* 80 */ "6",
-        /* 81 */ "7",
-        /* 82 */ "8",
-        /* 83 */ "9",
+        /* 80 */ "\u0663\u0662\u0661",
+        /* 81 */ "1",
+        /* 82 */ "2",
+        /* 83 */ "3",
+        /* 84 */ "4",
+        /* 85 */ "5",
+        /* 86 */ "6",
+        /* 87 */ "7",
+        /* 88 */ "8",
+        /* 89 */ "9",
         // U+066B: "٫" ARABIC DECIMAL SEPARATOR
         // U+066C: "٬" ARABIC THOUSANDS SEPARATOR
-        /* 84 */ "0,\u066B,\u066C",
-        /* 85~ */
+        /* 90 */ "0,\u066B,\u066C",
+        /* 91~ */
         null, null, null, null, null, null, null, null, null, null,
-        /* ~94 */
+        /* ~100 */
         // U+060C: "،" ARABIC COMMA
-        /* 95 */ "\u060C",
-        /* 96 */ "\\,",
-        /* 97 */ "\u061F",
-        /* 98 */ "\u061B",
-        // U+066A: "٪" ARABIC PERCENT SIGN
-        /* 99 */ "\u066A",
-        /* 100 */ null,
-        /* 101 */ "?",
-        /* 102 */ ";",
-        // U+2030: "‰" PER MILLE SIGN
-        /* 103 */ "\\%,\u2030",
-        /* 104~ */
-        null, null, null, null, null,
-        /* ~108 */
+        /* 101 */ "\u060C",
+        /* 102 */ "\\,",
+        // U+061F: "؟" ARABIC QUESTION MARK
         // U+060C: "،" ARABIC COMMA
         // U+061B: "؛" ARABIC SEMICOLON
-        // U+061F: "؟" ARABIC QUESTION MARK
-        /* 109 */ "\u060C",
-        /* 110 */ "\u061F",
-        /* 111 */ "\u061F,\u061B,!,:,-,/,\',\"",
+        /* 103 */ "\u060C",
+        /* 104 */ "\u061F",
+        /* 105 */ "!fixedColumnOrder!4,:,!,\u061F,\u061B,-,/,\",\'",
+        /* 106 */ null,
+        // U+0651: "ّ" ARABIC SHADDA
+        /* 107 */ "\u0651",
+        /* 108 */ "!text/more_keys_for_arabic_diacritics",
+        /* 109 */ null,
+        /* 110 */ "\u0651",
+        /* 111 */ "!text/more_keys_for_arabic_diacritics",
+        /* 112 */ "\u061F",
+        /* 113 */ "\u061B",
+        // U+066A: "٪" ARABIC PERCENT SIGN
+        /* 114 */ "\u066A",
+        /* 115 */ null,
+        // U+00BF: "¿" INVERTED QUESTION MARK
+        /* 116 */ "?,\u00BF",
+        /* 117 */ ";",
+        // U+2030: "‰" PER MILLE SIGN
+        /* 118 */ "\\%,\u2030",
     };
 
-    /* Language az: Azerbaijani */
-    private static final String[] LANGUAGE_az = {
+    /* Language az_AZ: Azerbaijani (Azerbaijan) */
+    private static final String[] LANGUAGE_az_AZ = {
         // U+00E2: "â" LATIN SMALL LETTER A WITH CIRCUMFLEX
         /* 0 */ "\u00E2",
         // U+0259: "ə" LATIN SMALL LETTER SCHWA
@@ -668,8 +681,8 @@
         /* 15 */ "\u011F",
     };
 
-    /* Language be: Belarusian */
-    private static final String[] LANGUAGE_be = {
+    /* Language be_BY: Belarusian (Belarus) */
+    private static final String[] LANGUAGE_be_BY = {
         /* 0~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null,
@@ -694,14 +707,16 @@
         /* ~42 */
         // U+0451: "ё" CYRILLIC SMALL LETTER IO
         /* 43 */ "\u0451",
-        /* 44 */ null,
+        /* 44~ */
+        null, null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        /* 51 */ "\u0410\u0411\u0412",
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language bg: Bulgarian */
@@ -710,15 +725,16 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
-        /* 46 */ null,
+        /* 51 */ "\u0410\u0411\u0412",
+        /* 52 */ null,
         // single_quotes of Bulgarian is default single_quotes_right_left.
-        /* 47 */ "!text/double_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language ca: Catalan */
@@ -782,22 +798,20 @@
         /* 15~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null,
-        /* ~52 */
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~58 */
         // U+00B7: "·" MIDDLE DOT
-        /* 53 */ "!fixedColumnOrder!9,;,/,(,),#,\u00B7,!,\\,,?,&,\\%,+,\",-,:,',@",
-        /* 54~ */
+        /* 59 */ "!fixedColumnOrder!9,;,/,(,),#,\u00B7,!,\\,,?,&,\\%,+,\",-,:,',@",
+        /* 60 */ "!fixedColumnOrder!8,;,/,(,),#,\u00B7,',\\,,&,\\%,+,\",-,:,@",
+        /* 61~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null,
-        /* ~107 */
-        /* 108 */ "?,\u00B7",
-        /* 109~ */
-        null, null, null, null, null, null, null, null, null,
-        /* ~117 */
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        null, null, null, null,
+        /* ~124 */
         // U+00E7: "ç" LATIN SMALL LETTER C WITH CEDILLA
-        /* 118 */ "\u00E7",
+        /* 125 */ "\u00E7",
     };
 
     /* Language cs: Czech */
@@ -871,12 +885,12 @@
         /* 13~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language da: Danish */
@@ -940,12 +954,12 @@
         /* 24 */ "\u00F6",
         /* 25~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language de: German */
@@ -991,12 +1005,25 @@
         /* 7~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null, null, null,
+        /* ~44 */
+        // U+00FC: "ü" LATIN SMALL LETTER U WITH DIAERESIS
+        /* 45 */ "\u00FC",
+        // U+00F6: "ö" LATIN SMALL LETTER O WITH DIAERESIS
+        /* 46 */ "\u00F6",
+        // U+00E4: "ä" LATIN SMALL LETTER A WITH DIAERESIS
+        /* 47 */ "\u00E4",
+        // U+00E8: "è" LATIN SMALL LETTER E WITH GRAVE
+        /* 48 */ "\u00E8",
+        // U+00E9: "é" LATIN SMALL LETTER E WITH ACUTE
+        /* 49 */ "\u00E9",
+        // U+00E0: "à" LATIN SMALL LETTER A WITH GRAVE
+        /* 50 */ "\u00E0",
+        /* 51 */ null,
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language el: Greek */
@@ -1005,12 +1032,13 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0391: "Α" GREEK CAPITAL LETTER ALPHA
         // U+0392: "Β" GREEK CAPITAL LETTER BETA
         // U+0393: "Γ" GREEK CAPITAL LETTER GAMMA
-        /* 45 */ "\u0391\u0392\u0393",
+        /* 51 */ "\u0391\u0392\u0393",
     };
 
     /* Language en: English */
@@ -1182,20 +1210,20 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null,
-        /* ~111 */
-        /* 112 */ "q",
-        /* 113 */ "x",
+        null, null, null, null, null, null, null, null, null,
+        /* ~118 */
+        /* 119 */ "q",
+        /* 120 */ "x",
         // U+015D: "ŝ" LATIN SMALL LETTER S WITH CIRCUMFLEX
-        /* 114 */ "\u015D",
+        /* 121 */ "\u015D",
         // U+011D: "ĝ" LATIN SMALL LETTER G WITH CIRCUMFLEX
-        /* 115 */ "\u011D",
+        /* 122 */ "\u011D",
         // U+016D: "ŭ" LATIN SMALL LETTER U WITH BREVE
-        /* 116 */ "\u016D",
+        /* 123 */ "\u016D",
         // U+0109: "ĉ" LATIN SMALL LETTER C WITH CIRCUMFLEX
-        /* 117 */ "\u0109",
+        /* 124 */ "\u0109",
         // U+0135: "ĵ" LATIN SMALL LETTER J WITH CIRCUMFLEX
-        /* 118 */ "\u0135",
+        /* 125 */ "\u0135",
     };
 
     /* Language es: Spanish */
@@ -1254,33 +1282,15 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~52 */
-        // U+00A1: "¡" INVERTED EXCLAMATION MARK
-        // U+00BF: "¿" INVERTED QUESTION MARK
-        /* 53 */ "!fixedColumnOrder!4,;,!,\\,,?,:,\u00A1,@,\u00BF",
-        /* 54~ */
-        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null,
-        /* ~105 */
-        // U+00A1: "¡" INVERTED EXCLAMATION MARK
-        /* 106 */ "!,\u00A1",
-        /* 107 */ null,
-        // U+00BF: "¿" INVERTED QUESTION MARK
-        /* 108 */ "?,\u00BF",
-        /* 109 */ "\"",
-        /* 110 */ "\'",
-        /* 111 */ "\'",
-        /* 112~ */
         null, null, null, null, null, null,
-        /* ~117 */
-        // U+00F1: "ñ" LATIN SMALL LETTER N WITH TILDE
-        /* 118 */ "\u00F1",
+        /* ~58 */
+        // U+00A1: "¡" INVERTED EXCLAMATION MARK
+        // U+00BF: "¿" INVERTED QUESTION MARK
+        /* 59 */ "!fixedColumnOrder!9,\u00A1,;,/,(,),#,!,\\,,?,\u00BF,&,\\%,+,\",-,:,',@",
     };
 
-    /* Language et: Estonian */
-    private static final String[] LANGUAGE_et = {
+    /* Language et_EE: Estonian (Estonia) */
+    private static final String[] LANGUAGE_et_EE = {
         // U+00E4: "ä" LATIN SMALL LETTER A WITH DIAERESIS
         // U+0101: "ā" LATIN SMALL LETTER A WITH MACRON
         // U+00E0: "à" LATIN SMALL LETTER A WITH GRAVE
@@ -1379,10 +1389,10 @@
         /* 23 */ "\u00F5",
         /* 24~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language fa: Persian */
@@ -1391,45 +1401,47 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0627: "ا" ARABIC LETTER ALEF
         // U+200C: ZERO WIDTH NON-JOINER
         // U+0628: "ب" ARABIC LETTER BEH
         // U+067E: "پ" ARABIC LETTER PEH
-        /* 45 */ "\u0627\u200C\u0628\u200C\u067E",
-        /* 46 */ null,
-        /* 47 */ null,
-        /* 48 */ "!text/single_laqm_raqm_rtl",
-        /* 49 */ "!text/double_laqm_raqm_rtl",
-        /* 50 */ null,
-        // U+FDFC: "﷼" RIAL SIGN
-        /* 51 */ "\uFDFC",
+        /* 51 */ "\u0627\u200C\u0628\u200C\u067E",
         /* 52 */ null,
+        /* 53 */ null,
+        /* 54 */ "!text/single_laqm_raqm_rtl",
+        /* 55 */ "!text/double_laqm_raqm_rtl",
+        /* 56 */ null,
+        // U+FDFC: "﷼" RIAL SIGN
+        /* 57 */ "\uFDFC",
+        /* 58 */ null,
         // U+061F: "؟" ARABIC QUESTION MARK
         // U+060C: "،" ARABIC COMMA
         // U+061B: "؛" ARABIC SEMICOLON
-        /* 53 */ "!fixedColumnOrder!8,\",\',#,-,:,!,\u060C,\u061F,@,&,\\%,+,\u061B,/,(|),)|(",
+        /* 59 */ "!fixedColumnOrder!8,\",\',#,-,:,!,\u060C,\u061F,@,&,\\%,+,\u061B,/,(|),)|(",
+        /* 60 */ null,
         // U+2605: "★" BLACK STAR
         // U+066D: "٭" ARABIC FIVE POINTED STAR
-        /* 54 */ "\u2605,\u066D",
+        /* 61 */ "\u2605,\u066D",
         // U+266A: "♪" EIGHTH NOTE
-        /* 55 */ "\u266A",
-        /* 56 */ null,
+        /* 62 */ "\u266A",
+        /* 63 */ null,
         // The all letters need to be mirrored are found at
         // http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt
         // U+FD3E: "﴾" ORNATE LEFT PARENTHESIS
         // U+FD3F: "﴿" ORNATE RIGHT PARENTHESIS
-        /* 57 */ "!fixedColumnOrder!4,\uFD3E|\uFD3F,<|>,{|},[|]",
-        /* 58 */ "!fixedColumnOrder!4,\uFD3F|\uFD3E,>|<,}|{,]|[",
+        /* 64 */ "!fixedColumnOrder!4,\uFD3E|\uFD3F,<|>,{|},[|]",
+        /* 65 */ "!fixedColumnOrder!4,\uFD3F|\uFD3E,>|<,}|{,]|[",
         // U+2264: "≤" LESS-THAN OR EQUAL TO
         // U+2265: "≥" GREATER-THAN EQUAL TO
         // U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+00BB: "»" RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+2039: "‹" SINGLE LEFT-POINTING ANGLE QUOTATION MARK
         // U+203A: "›" SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
-        /* 59 */ "!fixedColumnOrder!3,\u2039|\u203A,\u2264|\u2265,<|>",
-        /* 60 */ "!fixedColumnOrder!3,\u203A|\u2039,\u2265|\u2264,>|<",
+        /* 66 */ "!fixedColumnOrder!3,\u2039|\u203A,\u2264|\u2265,<|>",
+        /* 67 */ "!fixedColumnOrder!3,\u203A|\u2039,\u2265|\u2264,>|<",
         // U+0655: "ٕ" ARABIC HAMZA BELOW
         // U+0652: "ْ" ARABIC SUKUN
         // U+0651: "ّ" ARABIC SHADDA
@@ -1446,74 +1458,75 @@
         // U+0640: "ـ" ARABIC TATWEEL
         // In order to make Tatweel easily distinguishable from other punctuations, we use consecutive Tatweels only for its displayed label.
         // Note: The space character is needed as a preceding letter to draw Arabic diacritics characters correctly.
-        /* 61 */ "!fixedColumnOrder!7, \u0655|\u0655, \u0652|\u0652, \u0651|\u0651, \u064C|\u064C, \u064D|\u064D, \u064B|\u064B, \u0654|\u0654, \u0656|\u0656, \u0670|\u0670, \u0653|\u0653, \u064F|\u064F, \u0650|\u0650, \u064E|\u064E,\u0640\u0640\u0640|\u0640",
-        /* 62 */ "\u064B",
+        /* 68 */ "!fixedColumnOrder!7, \u0655|\u0655, \u0652|\u0652, \u0651|\u0651, \u064C|\u064C, \u064D|\u064D, \u064B|\u064B, \u0654|\u0654, \u0656|\u0656, \u0670|\u0670, \u0653|\u0653, \u064F|\u064F, \u0650|\u0650, \u064E|\u064E,\u0640\u0640\u0640|\u0640",
         // U+06F1: "۱" EXTENDED ARABIC-INDIC DIGIT ONE
-        /* 63 */ "\u06F1",
+        /* 69 */ "\u06F1",
         // U+06F2: "۲" EXTENDED ARABIC-INDIC DIGIT TWO
-        /* 64 */ "\u06F2",
+        /* 70 */ "\u06F2",
         // U+06F3: "۳" EXTENDED ARABIC-INDIC DIGIT THREE
-        /* 65 */ "\u06F3",
+        /* 71 */ "\u06F3",
         // U+06F4: "۴" EXTENDED ARABIC-INDIC DIGIT FOUR
-        /* 66 */ "\u06F4",
+        /* 72 */ "\u06F4",
         // U+06F5: "۵" EXTENDED ARABIC-INDIC DIGIT FIVE
-        /* 67 */ "\u06F5",
+        /* 73 */ "\u06F5",
         // U+06F6: "۶" EXTENDED ARABIC-INDIC DIGIT SIX
-        /* 68 */ "\u06F6",
+        /* 74 */ "\u06F6",
         // U+06F7: "۷" EXTENDED ARABIC-INDIC DIGIT SEVEN
-        /* 69 */ "\u06F7",
+        /* 75 */ "\u06F7",
         // U+06F8: "۸" EXTENDED ARABIC-INDIC DIGIT EIGHT
-        /* 70 */ "\u06F8",
+        /* 76 */ "\u06F8",
         // U+06F9: "۹" EXTENDED ARABIC-INDIC DIGIT NINE
-        /* 71 */ "\u06F9",
+        /* 77 */ "\u06F9",
         // U+06F0: "۰" EXTENDED ARABIC-INDIC DIGIT ZERO
-        /* 72 */ "\u06F0",
+        /* 78 */ "\u06F0",
         // Label for "switch to symbols" key.
         // U+061F: "؟" ARABIC QUESTION MARK
-        /* 73 */ "\u06F3\u06F2\u06F1\u061F",
+        /* 79 */ "\u06F3\u06F2\u06F1\u061F",
         // Label for "switch to symbols with microphone" key. This string shouldn't include the "mic"
         // part because it'll be appended by the code.
-        /* 74 */ "\u06F3\u06F2\u06F1",
-        /* 75 */ "1",
-        /* 76 */ "2",
-        /* 77 */ "3",
-        /* 78 */ "4",
-        /* 79 */ "5",
-        /* 80 */ "6",
-        /* 81 */ "7",
-        /* 82 */ "8",
-        /* 83 */ "9",
+        /* 80 */ "\u06F3\u06F2\u06F1",
+        /* 81 */ "1",
+        /* 82 */ "2",
+        /* 83 */ "3",
+        /* 84 */ "4",
+        /* 85 */ "5",
+        /* 86 */ "6",
+        /* 87 */ "7",
+        /* 88 */ "8",
+        /* 89 */ "9",
         // U+066B: "٫" ARABIC DECIMAL SEPARATOR
         // U+066C: "٬" ARABIC THOUSANDS SEPARATOR
-        /* 84 */ "0,\u066B,\u066C",
-        /* 85~ */
+        /* 90 */ "0,\u066B,\u066C",
+        /* 91~ */
         null, null, null, null, null, null, null, null, null, null,
-        /* ~94 */
+        /* ~100 */
         // U+060C: "،" ARABIC COMMA
-        /* 95 */ "\u060C",
-        /* 96 */ "\\,",
-        /* 97 */ "\u061F",
-        /* 98 */ "\u061B",
-        // U+066A: "٪" ARABIC PERCENT SIGN
-        /* 99 */ "\u066A",
-        /* 100 */ null,
-        /* 101 */ "?",
-        /* 102 */ ";",
-        // U+2030: "‰" PER MILLE SIGN
-        /* 103 */ "\\%,\u2030",
+        /* 101 */ "\u060C",
+        /* 102 */ "\\,",
         // U+060C: "،" ARABIC COMMA
         // U+061B: "؛" ARABIC SEMICOLON
         // U+061F: "؟" ARABIC QUESTION MARK
         // U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+00BB: "»" RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
-        /* 104 */ "\u060C",
-        /* 105 */ "!",
-        /* 106 */ "!,\\,",
+        /* 103 */ "\u060C",
+        /* 104 */ "\u061F",
+        /* 105 */ "!fixedColumnOrder!4,:,!,\u061F,\u061B,-,/,\u00AB|\u00BB,\u00BB|\u00AB",
+        /* 106 */ null,
         /* 107 */ "\u061F",
-        /* 108 */ "\u061F,?",
-        /* 109 */ "\u060C",
-        /* 110 */ "\u061F",
-        /* 111 */ "!fixedColumnOrder!4,:,!,\u061F,\u061B,-,/,\u00AB|\u00BB,\u00BB|\u00AB",
+        /* 108 */ "!text/more_keys_for_arabic_diacritics",
+        /* 109 */ null,
+        /* 110 */ "\u064B",
+        /* 111 */ "!text/more_keys_for_arabic_diacritics",
+        /* 112 */ "\u061F",
+        /* 113 */ "\u061B",
+        // U+066A: "٪" ARABIC PERCENT SIGN
+        /* 114 */ "\u066A",
+        /* 115 */ null,
+        // U+00BF: "¿" INVERTED QUESTION MARK
+        /* 116 */ "?,\u00BF",
+        /* 117 */ ";",
+        // U+2030: "‰" PER MILLE SIGN
+        /* 118 */ "\\%,\u2030",
     };
 
     /* Language fi: Finnish */
@@ -1614,6 +1627,23 @@
         /* 7 */ "\u00E7,\u0107,\u010D",
         // U+00FF: "ÿ" LATIN SMALL LETTER Y WITH DIAERESIS
         /* 8 */ "%,\u00FF",
+        /* 9~ */
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        null, null, null, null, null, null,
+        /* ~44 */
+        // U+00E8: "è" LATIN SMALL LETTER E WITH GRAVE
+        /* 45 */ "\u00E8",
+        // U+00E9: "é" LATIN SMALL LETTER E WITH ACUTE
+        /* 46 */ "\u00E9",
+        // U+00E0: "à" LATIN SMALL LETTER A WITH GRAVE
+        /* 47 */ "\u00E0",
+        // U+00FC: "ü" LATIN SMALL LETTER U WITH DIAERESIS
+        /* 48 */ "\u00FC",
+        // U+00F6: "ö" LATIN SMALL LETTER O WITH DIAERESIS
+        /* 49 */ "\u00F6",
+        // U+00E4: "ä" LATIN SMALL LETTER A WITH DIAERESIS
+        /* 50 */ "\u00E4",
     };
 
     /* Language hi: Hindi */
@@ -1622,55 +1652,56 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0915: "क" DEVANAGARI LETTER KA
         // U+0916: "ख" DEVANAGARI LETTER KHA
         // U+0917: "ग" DEVANAGARI LETTER GA
-        /* 45 */ "\u0915\u0916\u0917",
-        /* 46~ */
-        null, null, null, null, null,
-        /* ~50 */
-        // U+20B9: "₹" INDIAN RUPEE SIGN
-        /* 51 */ "\u20B9",
+        /* 51 */ "\u0915\u0916\u0917",
         /* 52~ */
+        null, null, null, null, null,
+        /* ~56 */
+        // U+20B9: "₹" INDIAN RUPEE SIGN
+        /* 57 */ "\u20B9",
+        /* 58~ */
         null, null, null, null, null, null, null, null, null, null, null,
-        /* ~62 */
+        /* ~68 */
         // U+0967: "१" DEVANAGARI DIGIT ONE
-        /* 63 */ "\u0967",
+        /* 69 */ "\u0967",
         // U+0968: "२" DEVANAGARI DIGIT TWO
-        /* 64 */ "\u0968",
+        /* 70 */ "\u0968",
         // U+0969: "३" DEVANAGARI DIGIT THREE
-        /* 65 */ "\u0969",
+        /* 71 */ "\u0969",
         // U+096A: "४" DEVANAGARI DIGIT FOUR
-        /* 66 */ "\u096A",
+        /* 72 */ "\u096A",
         // U+096B: "५" DEVANAGARI DIGIT FIVE
-        /* 67 */ "\u096B",
+        /* 73 */ "\u096B",
         // U+096C: "६" DEVANAGARI DIGIT SIX
-        /* 68 */ "\u096C",
+        /* 74 */ "\u096C",
         // U+096D: "७" DEVANAGARI DIGIT SEVEN
-        /* 69 */ "\u096D",
+        /* 75 */ "\u096D",
         // U+096E: "८" DEVANAGARI DIGIT EIGHT
-        /* 70 */ "\u096E",
+        /* 76 */ "\u096E",
         // U+096F: "९" DEVANAGARI DIGIT NINE
-        /* 71 */ "\u096F",
+        /* 77 */ "\u096F",
         // U+0966: "०" DEVANAGARI DIGIT ZERO
-        /* 72 */ "\u0966",
+        /* 78 */ "\u0966",
         // Label for "switch to symbols" key.
-        /* 73 */ "?\u0967\u0968\u0969",
+        /* 79 */ "?\u0967\u0968\u0969",
         // Label for "switch to symbols with microphone" key. This string shouldn't include the "mic"
         // part because it'll be appended by the code.
-        /* 74 */ "\u0967\u0968\u0969",
-        /* 75 */ "1",
-        /* 76 */ "2",
-        /* 77 */ "3",
-        /* 78 */ "4",
-        /* 79 */ "5",
-        /* 80 */ "6",
-        /* 81 */ "7",
-        /* 82 */ "8",
-        /* 83 */ "9",
-        /* 84 */ "0",
+        /* 80 */ "\u0967\u0968\u0969",
+        /* 81 */ "1",
+        /* 82 */ "2",
+        /* 83 */ "3",
+        /* 84 */ "4",
+        /* 85 */ "5",
+        /* 86 */ "6",
+        /* 87 */ "7",
+        /* 88 */ "8",
+        /* 89 */ "9",
+        /* 90 */ "0",
     };
 
     /* Language hr: Croatian */
@@ -1701,12 +1732,12 @@
         /* 13~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_rqm",
-        /* 47 */ "!text/double_9qm_rqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_rqm",
+        /* 53 */ "!text/double_9qm_rqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language hu: Hungarian */
@@ -1755,22 +1786,23 @@
         /* 5~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_rqm",
-        /* 47 */ "!text/double_9qm_rqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_rqm",
+        /* 53 */ "!text/double_9qm_rqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
-    /* Language hy: Armenian */
-    private static final String[] LANGUAGE_hy = {
+    /* Language hy_AM: Armenian (Armenia) */
+    private static final String[] LANGUAGE_hy_AM = {
         /* 0~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null,
-        /* ~52 */
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~58 */
         // U+058A: "֊" ARMENIAN HYPHEN
         // U+055C: "՜" ARMENIAN EXCLAMATION MARK
         // U+055D: "՝" ARMENIAN COMMA
@@ -1779,19 +1811,36 @@
         // U+055A: "՚" ARMENIAN APOSTROPHE
         // U+055B: "՛" ARMENIAN EMPHASIS MARK
         // U+055F: "՟" ARMENIAN ABBREVIATION MARK
-        /* 53 */ "!fixedColumnOrder!8,!,?,\\,,.,\u058A,\u055C,\u055D,\u055E,:,;,@,\u0559,\u055A,\u055B,\u055F",
-        /* 54~ */
+        /* 59 */ "!fixedColumnOrder!8,!,?,\u0559,\u055A,.,\u055C,\\,,\u055E,:,;,\u055F,\u00AB,\u00BB,\u058A,\u055D,\u055B",
+        /* 60~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null,
-        /* ~99 */
+        null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~102 */
+        // U+058F: "֏" ARMENIAN DRAM SIGN
+        // TODO: Enable this when we have glyph for the following letter
+        // <string name="keylabel_for_currency">&#x058F;</string>
+        // 
+        // U+055D: "՝" ARMENIAN COMMA
+        /* 103 */ "\u055D",
+        /* 104 */ null,
+        /* 105 */ null,
+        // U+0589: "։" ARMENIAN FULL STOP
+        /* 106 */ "\u0589",
+        /* 107 */ null,
+        /* 108 */ null,
+        /* 109 */ "\u0589",
+        /* 110 */ null,
+        /* 111 */ "!text/more_keys_for_punctuation",
+        /* 112~ */
+        null, null, null,
+        /* ~114 */
         // U+055C: "՜" ARMENIAN EXCLAMATION MARK
         // U+00A1: "¡" INVERTED EXCLAMATION MARK
-        /* 100 */ "\u055C,\u00A1",
+        /* 115 */ "\u055C,\u00A1",
         // U+055E: "՞" ARMENIAN QUESTION MARK
         // U+00BF: "¿" INVERTED QUESTION MARK
-        /* 101 */ "\u055E,\u00BF",
+        /* 116 */ "\u055E,\u00BF",
     };
 
     /* Language is: Icelandic */
@@ -1857,10 +1906,10 @@
         /* 22 */ "\u00FE",
         /* 23~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language it: Italian */
@@ -1914,12 +1963,13 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+05D0: "א" HEBREW LETTER ALEF
         // U+05D1: "ב" HEBREW LETTER BET
         // U+05D2: "ג" HEBREW LETTER GIMEL
-        /* 45 */ "\u05D0\u05D1\u05D2",
+        /* 51 */ "\u05D0\u05D1\u05D2",
         // The following characters don't need BIDI mirroring.
         // U+2018: "‘" LEFT SINGLE QUOTATION MARK
         // U+2019: "’" RIGHT SINGLE QUOTATION MARK
@@ -1927,58 +1977,51 @@
         // U+201C: "“" LEFT DOUBLE QUOTATION MARK
         // U+201D: "”" RIGHT DOUBLE QUOTATION MARK
         // U+201E: "„" DOUBLE LOW-9 QUOTATION MARK
-        /* 46 */ "\u2018,\u2019,\u201A",
-        /* 47 */ "\u201C,\u201D,\u201E",
-        /* 48 */ "!text/single_laqm_raqm_rtl",
-        /* 49 */ "!text/double_laqm_raqm_rtl",
-        /* 50 */ null,
+        /* 52 */ "\u2018,\u2019,\u201A",
+        /* 53 */ "\u201C,\u201D,\u201E",
+        /* 54 */ "!text/single_laqm_raqm_rtl",
+        /* 55 */ "!text/double_laqm_raqm_rtl",
+        /* 56 */ null,
         // U+20AA: "₪" NEW SHEQEL SIGN
-        /* 51 */ "\u20AA",
-        /* 52 */ null,
-        /* 53 */ "!fixedColumnOrder!8,;,/,(|),)|(,#,!,\\,,?,&,\\%,+,\",-,:,',@",
+        /* 57 */ "\u20AA",
+        /* 58 */ null,
+        /* 59 */ "!fixedColumnOrder!8,;,/,(|),)|(,#,!,\\,,?,&,\\%,+,\",-,:,',@",
+        /* 60 */ "!fixedColumnOrder!7,;,/,(|),)|(,#,',\\,,&,\\%,+,\",-,:,@",
         // U+2605: "★" BLACK STAR
-        /* 54 */ "\u2605",
-        /* 55 */ null,
+        /* 61 */ "\u2605",
+        /* 62 */ null,
         // U+00B1: "±" PLUS-MINUS SIGN
         // U+FB29: "﬩" HEBREW LETTER ALTERNATIVE PLUS SIGN
-        /* 56 */ "\u00B1,\uFB29",
+        /* 63 */ "\u00B1,\uFB29",
         // The all letters need to be mirrored are found at
         // http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt
-        /* 57 */ "!fixedColumnOrder!3,<|>,{|},[|]",
-        /* 58 */ "!fixedColumnOrder!3,>|<,}|{,]|[",
+        /* 64 */ "!fixedColumnOrder!3,<|>,{|},[|]",
+        /* 65 */ "!fixedColumnOrder!3,>|<,}|{,]|[",
         // U+2264: "≤" LESS-THAN OR EQUAL TO
         // U+2265: "≥" GREATER-THAN EQUAL TO
         // U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+00BB: "»" RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
         // U+2039: "‹" SINGLE LEFT-POINTING ANGLE QUOTATION MARK
         // U+203A: "›" SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
-        /* 59 */ "!fixedColumnOrder!3,\u2039|\u203A,\u2264|\u2265,\u00AB|\u00BB",
-        /* 60 */ "!fixedColumnOrder!3,\u203A|\u2039,\u2265|\u2264,\u00BB|\u00AB",
-        /* 61~ */
-        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~104 */
-        /* 105 */ "!",
-        /* 106 */ "!",
-        /* 107 */ "?",
-        /* 108 */ "?",
+        /* 66 */ "!fixedColumnOrder!3,\u2039|\u203A,\u2264|\u2265,\u00AB|\u00BB",
+        /* 67 */ "!fixedColumnOrder!3,\u203A|\u2039,\u2265|\u2264,\u00BB|\u00AB",
     };
 
-    /* Language ka: Georgian */
-    private static final String[] LANGUAGE_ka = {
+    /* Language ka_GE: Georgian (Georgia) */
+    private static final String[] LANGUAGE_ka_GE = {
         /* 0~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+10D0: "ა" GEORGIAN LETTER AN
         // U+10D1: "ბ" GEORGIAN LETTER BAN
         // U+10D2: "გ" GEORGIAN LETTER GAN
-        /* 45 */ "\u10D0\u10D1\u10D2",
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        /* 51 */ "\u10D0\u10D1\u10D2",
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language kk: Kazakh */
@@ -2021,31 +2064,34 @@
         /* ~42 */
         // U+0451: "ё" CYRILLIC SMALL LETTER IO
         /* 43 */ "\u0451",
-        /* 44 */ null,
+        /* 44~ */
+        null, null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
+        /* 51 */ "\u0410\u0411\u0412",
     };
 
-    /* Language km: Khmer */
-    private static final String[] LANGUAGE_km = {
+    /* Language km_KH: Khmer (Cambodia) */
+    private static final String[] LANGUAGE_km_KH = {
         /* 0~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+1780: "ក" KHMER LETTER KA
         // U+1781: "ខ" KHMER LETTER KHA
         // U+1782: "គ" KHMER LETTER KO
-        /* 45 */ "\u1780\u1781\u1782",
-        /* 46~ */
+        /* 51 */ "\u1780\u1781\u1782",
+        /* 52~ */
         null, null, null, null,
-        /* ~49 */
+        /* ~55 */
         // U+17DB: "៛" KHMER CURRENCY SYMBOL RIEL
-        /* 50 */ "\u17DB,\u00A2,\u00A3,\u20AC,\u00A5,\u20B1",
+        /* 56 */ "\u17DB,\u00A2,\u00A3,\u20AC,\u00A5,\u20B1",
     };
 
     /* Language ky: Kirghiz */
@@ -2081,31 +2127,34 @@
         /* ~42 */
         // U+0451: "ё" CYRILLIC SMALL LETTER IO
         /* 43 */ "\u0451",
-        /* 44 */ null,
+        /* 44~ */
+        null, null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
+        /* 51 */ "\u0410\u0411\u0412",
     };
 
-    /* Language lo: Lao */
-    private static final String[] LANGUAGE_lo = {
+    /* Language lo_LA: Lao (Laos) */
+    private static final String[] LANGUAGE_lo_LA = {
         /* 0~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0E81: "ກ" LAO LETTER KO
         // U+0E82: "ຂ" LAO LETTER KHO SUNG
         // U+0E84: "ຄ" LAO LETTER KHO TAM
-        /* 45 */ "\u0E81\u0E82\u0E84",
-        /* 46~ */
+        /* 51 */ "\u0E81\u0E82\u0E84",
+        /* 52~ */
         null, null, null, null, null,
-        /* ~50 */
+        /* ~56 */
         // U+20AD: "₭" KIP SIGN
-        /* 51 */ "\u20AD",
+        /* 57 */ "\u20AD",
     };
 
     /* Language lt: Lithuanian */
@@ -2199,9 +2248,10 @@
         /* 16~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language lv: Latvian */
@@ -2294,9 +2344,10 @@
         /* 16~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language mk: Macedonian */
@@ -2318,32 +2369,36 @@
         /* 43 */ "\u0450",
         // U+045D: "ѝ" CYRILLIC SMALL LETTER I WITH GRAVE
         /* 44 */ "\u045D",
+        /* 45~ */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        /* 51 */ "\u0410\u0411\u0412",
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
-    /* Language mn: Mongolian */
-    private static final String[] LANGUAGE_mn = {
+    /* Language mn_MN: Mongolian (Mongolia) */
+    private static final String[] LANGUAGE_mn_MN = {
         /* 0~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
-        /* 46~ */
+        /* 51 */ "\u0410\u0411\u0412",
+        /* 52~ */
         null, null, null, null, null,
-        /* ~50 */
+        /* ~56 */
         // U+20AE: "₮" TUGRIK SIGN
-        /* 51 */ "\u20AE",
+        /* 57 */ "\u20AE",
     };
 
     /* Language nb: Norwegian Bokmål */
@@ -2393,67 +2448,68 @@
         /* 24 */ "\u00E4",
         /* 25~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_rqm",
-        /* 47 */ "!text/double_9qm_rqm",
+        null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_rqm",
+        /* 53 */ "!text/double_9qm_rqm",
     };
 
-    /* Language ne: Nepali */
-    private static final String[] LANGUAGE_ne = {
+    /* Language ne_NP: Nepali (Nepal) */
+    private static final String[] LANGUAGE_ne_NP = {
         /* 0~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0915: "क" DEVANAGARI LETTER KA
         // U+0916: "ख" DEVANAGARI LETTER KHA
         // U+0917: "ग" DEVANAGARI LETTER GA
-        /* 45 */ "\u0915\u0916\u0917",
-        /* 46~ */
-        null, null, null, null, null,
-        /* ~50 */
-        // U+0930/U+0941/U+002E "रु." NEPALESE RUPEE SIGN
-        /* 51 */ "\u0930\u0941.",
+        /* 51 */ "\u0915\u0916\u0917",
         /* 52~ */
+        null, null, null, null, null,
+        /* ~56 */
+        // U+0930/U+0941/U+002E "रु." NEPALESE RUPEE SIGN
+        /* 57 */ "\u0930\u0941.",
+        /* 58~ */
         null, null, null, null, null, null, null, null, null, null, null,
-        /* ~62 */
+        /* ~68 */
         // U+0967: "१" DEVANAGARI DIGIT ONE
-        /* 63 */ "\u0967",
+        /* 69 */ "\u0967",
         // U+0968: "२" DEVANAGARI DIGIT TWO
-        /* 64 */ "\u0968",
+        /* 70 */ "\u0968",
         // U+0969: "३" DEVANAGARI DIGIT THREE
-        /* 65 */ "\u0969",
+        /* 71 */ "\u0969",
         // U+096A: "४" DEVANAGARI DIGIT FOUR
-        /* 66 */ "\u096A",
+        /* 72 */ "\u096A",
         // U+096B: "५" DEVANAGARI DIGIT FIVE
-        /* 67 */ "\u096B",
+        /* 73 */ "\u096B",
         // U+096C: "६" DEVANAGARI DIGIT SIX
-        /* 68 */ "\u096C",
+        /* 74 */ "\u096C",
         // U+096D: "७" DEVANAGARI DIGIT SEVEN
-        /* 69 */ "\u096D",
+        /* 75 */ "\u096D",
         // U+096E: "८" DEVANAGARI DIGIT EIGHT
-        /* 70 */ "\u096E",
+        /* 76 */ "\u096E",
         // U+096F: "९" DEVANAGARI DIGIT NINE
-        /* 71 */ "\u096F",
+        /* 77 */ "\u096F",
         // U+0966: "०" DEVANAGARI DIGIT ZERO
-        /* 72 */ "\u0966",
+        /* 78 */ "\u0966",
         // Label for "switch to symbols" key.
-        /* 73 */ "?\u0967\u0968\u0969",
+        /* 79 */ "?\u0967\u0968\u0969",
         // Label for "switch to symbols with microphone" key. This string shouldn't include the "mic"
         // part because it'll be appended by the code.
-        /* 74 */ "\u0967\u0968\u0969",
-        /* 75 */ "1",
-        /* 76 */ "2",
-        /* 77 */ "3",
-        /* 78 */ "4",
-        /* 79 */ "5",
-        /* 80 */ "6",
-        /* 81 */ "7",
-        /* 82 */ "8",
-        /* 83 */ "9",
-        /* 84 */ "0",
+        /* 80 */ "\u0967\u0968\u0969",
+        /* 81 */ "1",
+        /* 82 */ "2",
+        /* 83 */ "3",
+        /* 84 */ "4",
+        /* 85 */ "5",
+        /* 86 */ "6",
+        /* 87 */ "7",
+        /* 88 */ "8",
+        /* 89 */ "9",
+        /* 90 */ "0",
     };
 
     /* Language nl: Dutch */
@@ -2508,10 +2564,10 @@
         /* 9~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_rqm",
-        /* 47 */ "!text/double_9qm_rqm",
+        null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_rqm",
+        /* 53 */ "!text/double_9qm_rqm",
     };
 
     /* Language pl: Polish */
@@ -2569,10 +2625,10 @@
         /* 15~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_rqm",
-        /* 47 */ "!text/double_9qm_rqm",
+        null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_rqm",
+        /* 53 */ "!text/double_9qm_rqm",
     };
 
     /* Language pt: Portuguese */
@@ -2675,10 +2731,10 @@
         /* 12~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_rqm",
-        /* 47 */ "!text/double_9qm_rqm",
+        null, null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_rqm",
+        /* 53 */ "!text/double_9qm_rqm",
     };
 
     /* Language ru: Russian */
@@ -2707,14 +2763,16 @@
         /* ~42 */
         // U+0451: "ё" CYRILLIC SMALL LETTER IO
         /* 43 */ "\u0451",
-        /* 44 */ null,
+        /* 44~ */
+        null, null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
+        /* 51 */ "\u0410\u0411\u0412",
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
     };
 
     /* Language sk: Slovak */
@@ -2808,11 +2866,12 @@
         /* 16~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language sl: Slovenian */
@@ -2836,12 +2895,12 @@
         /* 13~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null,
-        /* ~45 */
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null, null, null, null,
+        /* ~51 */
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language sr: Serbian */
@@ -2881,16 +2940,19 @@
         /* 43 */ "\u0450",
         // U+045D: "ѝ" CYRILLIC SMALL LETTER I WITH GRAVE
         /* 44 */ "\u045D",
+        /* 45~ */
+        null, null, null, null, null, null,
+        /* ~50 */
         // END: More keys definitions for Serbian (Cyrillic)
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        /* 51 */ "\u0410\u0411\u0412",
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language sv: Swedish */
@@ -2972,10 +3034,10 @@
         /* 24 */ "\u00E6",
         /* 25~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null,
-        /* ~47 */
-        /* 48 */ "!text/single_raqm_laqm",
-        /* 49 */ "!text/double_raqm_laqm",
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~53 */
+        /* 54 */ "!text/single_raqm_laqm",
+        /* 55 */ "!text/double_raqm_laqm",
     };
 
     /* Language sw: Swahili */
@@ -3035,17 +3097,18 @@
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0E01: "ก" THAI CHARACTER KO KAI
         // U+0E02: "ข" THAI CHARACTER KHO KHAI
         // U+0E04: "ค" THAI CHARACTER KHO KHWAI
-        /* 45 */ "\u0E01\u0E02\u0E04",
-        /* 46~ */
+        /* 51 */ "\u0E01\u0E02\u0E04",
+        /* 52~ */
         null, null, null, null, null,
-        /* ~50 */
+        /* ~56 */
         // U+0E3F: "฿" THAI CURRENCY SYMBOL BAHT
-        /* 51 */ "\u0E3F",
+        /* 57 */ "\u0E3F",
     };
 
     /* Language tl: Tagalog */
@@ -3175,20 +3238,20 @@
         // U+044A: "ъ" CYRILLIC SMALL LETTER HARD SIGN
         /* 37 */ "\u044A",
         /* 38~ */
-        null, null, null, null, null, null, null,
-        /* ~44 */
+        null, null, null, null, null, null, null, null, null, null, null, null, null,
+        /* ~50 */
         // Label for "switch to alphabetic" key.
         // U+0410: "А" CYRILLIC CAPITAL LETTER A
         // U+0411: "Б" CYRILLIC CAPITAL LETTER BE
         // U+0412: "В" CYRILLIC CAPITAL LETTER VE
-        /* 45 */ "\u0410\u0411\u0412",
-        /* 46 */ "!text/single_9qm_lqm",
-        /* 47 */ "!text/double_9qm_lqm",
-        /* 48~ */
+        /* 51 */ "\u0410\u0411\u0412",
+        /* 52 */ "!text/single_9qm_lqm",
+        /* 53 */ "!text/double_9qm_lqm",
+        /* 54~ */
         null, null, null,
-        /* ~50 */
+        /* ~56 */
         // U+20B4: "₴" HRYVNIA SIGN
-        /* 51 */ "\u20B4",
+        /* 57 */ "\u20B4",
     };
 
     /* Language vi: Vietnamese */
@@ -3273,10 +3336,11 @@
         /* 10~ */
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
         null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
-        null, null, null, null, null, null, null, null, null, null, null,
-        /* ~50 */
+        null, null, null, null, null, null, null, null, null, null, null, null, null, null, null,
+        null, null,
+        /* ~56 */
         // U+20AB: "₫" DONG SIGN
-        /* 51 */ "\u20AB",
+        /* 57 */ "\u20AB",
     };
 
     /* Language zu: Zulu */
@@ -3449,12 +3513,14 @@
         /* 19 */ "\u0175",
     };
 
+    // TODO: Use the language + "_" + region representation for the locale string key.
+    // Currently we are dropping the region from the key.
     private static final Object[] LANGUAGES_AND_TEXTS = {
         "DEFAULT", LANGUAGE_DEFAULT, /* default */
         "af", LANGUAGE_af, /* Afrikaans */
         "ar", LANGUAGE_ar, /* Arabic */
-        "az", LANGUAGE_az, /* Azerbaijani */
-        "be", LANGUAGE_be, /* Belarusian */
+        "az" /* "az_AZ" */, LANGUAGE_az_AZ, /* Azerbaijani (Azerbaijan) */
+        "be" /* "be_BY" */, LANGUAGE_be_BY, /* Belarusian (Belarus) */
         "bg", LANGUAGE_bg, /* Bulgarian */
         "ca", LANGUAGE_ca, /* Catalan */
         "cs", LANGUAGE_cs, /* Czech */
@@ -3464,28 +3530,28 @@
         "en", LANGUAGE_en, /* English */
         "eo", LANGUAGE_eo, /* Esperanto */
         "es", LANGUAGE_es, /* Spanish */
-        "et", LANGUAGE_et, /* Estonian */
+        "et" /* "et_EE" */, LANGUAGE_et_EE, /* Estonian (Estonia) */
         "fa", LANGUAGE_fa, /* Persian */
         "fi", LANGUAGE_fi, /* Finnish */
         "fr", LANGUAGE_fr, /* French */
         "hi", LANGUAGE_hi, /* Hindi */
         "hr", LANGUAGE_hr, /* Croatian */
         "hu", LANGUAGE_hu, /* Hungarian */
-        "hy", LANGUAGE_hy, /* Armenian */
+        "hy" /* "hy_AM" */, LANGUAGE_hy_AM, /* Armenian (Armenia) */
         "is", LANGUAGE_is, /* Icelandic */
         "it", LANGUAGE_it, /* Italian */
         "iw", LANGUAGE_iw, /* Hebrew */
-        "ka", LANGUAGE_ka, /* Georgian */
+        "ka" /* "ka_GE" */, LANGUAGE_ka_GE, /* Georgian (Georgia) */
         "kk", LANGUAGE_kk, /* Kazakh */
-        "km", LANGUAGE_km, /* Khmer */
+        "km" /* "km_KH" */, LANGUAGE_km_KH, /* Khmer (Cambodia) */
         "ky", LANGUAGE_ky, /* Kirghiz */
-        "lo", LANGUAGE_lo, /* Lao */
+        "lo" /* "lo_LA" */, LANGUAGE_lo_LA, /* Lao (Laos) */
         "lt", LANGUAGE_lt, /* Lithuanian */
         "lv", LANGUAGE_lv, /* Latvian */
         "mk", LANGUAGE_mk, /* Macedonian */
-        "mn", LANGUAGE_mn, /* Mongolian */
+        "mn" /* "mn_MN" */, LANGUAGE_mn_MN, /* Mongolian (Mongolia) */
         "nb", LANGUAGE_nb, /* Norwegian Bokmål */
-        "ne", LANGUAGE_ne, /* Nepali */
+        "ne" /* "ne_NP" */, LANGUAGE_ne_NP, /* Nepali (Nepal) */
         "nl", LANGUAGE_nl, /* Dutch */
         "pl", LANGUAGE_pl, /* Polish */
         "pt", LANGUAGE_pt, /* Portuguese */
diff --git a/java/src/com/android/inputmethod/keyboard/internal/NonDistinctMultitouchHelper.java b/java/src/com/android/inputmethod/keyboard/internal/NonDistinctMultitouchHelper.java
index a0935b9..3a9aa81 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/NonDistinctMultitouchHelper.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/NonDistinctMultitouchHelper.java
@@ -20,18 +20,19 @@
 import android.view.MotionEvent;
 
 import com.android.inputmethod.keyboard.Key;
+import com.android.inputmethod.keyboard.KeyDetector;
 import com.android.inputmethod.keyboard.PointerTracker;
-import com.android.inputmethod.keyboard.PointerTracker.KeyEventHandler;
 import com.android.inputmethod.latin.utils.CoordinateUtils;
 
 public final class NonDistinctMultitouchHelper {
     private static final String TAG = NonDistinctMultitouchHelper.class.getSimpleName();
 
+    private static final int MAIN_POINTER_TRACKER_ID = 0;
     private int mOldPointerCount = 1;
     private Key mOldKey;
     private int[] mLastCoords = CoordinateUtils.newInstance();
 
-    public void processMotionEvent(final MotionEvent me, final KeyEventHandler keyEventHandler) {
+    public void processMotionEvent(final MotionEvent me, final KeyDetector keyDetector) {
         final int pointerCount = me.getPointerCount();
         final int oldPointerCount = mOldPointerCount;
         mOldPointerCount = pointerCount;
@@ -41,8 +42,9 @@
             return;
         }
 
-        // Use only main (id=0) pointer tracker.
-        final PointerTracker mainTracker = PointerTracker.getPointerTracker(0, keyEventHandler);
+        // Use only main pointer tracker.
+        final PointerTracker mainTracker = PointerTracker.getPointerTracker(
+                MAIN_POINTER_TRACKER_ID);
         final int action = me.getActionMasked();
         final int index = me.getActionIndex();
         final long eventTime = me.getEventTime();
@@ -51,12 +53,12 @@
         // In single-touch.
         if (oldPointerCount == 1 && pointerCount == 1) {
             if (me.getPointerId(index) == mainTracker.mPointerId) {
-                mainTracker.processMotionEvent(me, keyEventHandler);
+                mainTracker.processMotionEvent(me, keyDetector);
                 return;
             }
             // Inject a copied event.
             injectMotionEvent(action, me.getX(index), me.getY(index), downTime, eventTime,
-                    mainTracker, keyEventHandler);
+                    mainTracker, keyDetector);
             return;
         }
 
@@ -70,7 +72,7 @@
             mOldKey = mainTracker.getKeyOn(x, y);
             // Inject an artifact up event for the old key.
             injectMotionEvent(MotionEvent.ACTION_UP, x, y, downTime, eventTime,
-                    mainTracker, keyEventHandler);
+                    mainTracker, keyDetector);
             return;
         }
 
@@ -85,11 +87,11 @@
                 // Inject an artifact down event for the new key.
                 // An artifact up event for the new key will usually be injected as a single-touch.
                 injectMotionEvent(MotionEvent.ACTION_DOWN, x, y, downTime, eventTime,
-                        mainTracker, keyEventHandler);
+                        mainTracker, keyDetector);
                 if (action == MotionEvent.ACTION_UP) {
                     // Inject an artifact up event for the new key also.
                     injectMotionEvent(MotionEvent.ACTION_UP, x, y, downTime, eventTime,
-                            mainTracker, keyEventHandler);
+                            mainTracker, keyDetector);
                 }
             }
             return;
@@ -101,11 +103,11 @@
 
     private static void injectMotionEvent(final int action, final float x, final float y,
             final long downTime, final long eventTime, final PointerTracker tracker,
-            final KeyEventHandler handler) {
+            final KeyDetector keyDetector) {
         final MotionEvent me = MotionEvent.obtain(
                 downTime, eventTime, action, x, y, 0 /* metaState */);
         try {
-            tracker.processMotionEvent(me, handler);
+            tracker.processMotionEvent(me, keyDetector);
         } finally {
             me.recycle();
         }
diff --git a/java/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueue.java b/java/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueue.java
index 7ee45e8..5ac3418 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueue.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueue.java
@@ -28,7 +28,7 @@
 
     public interface Element {
         public boolean isModifier();
-        public boolean isInSlidingKeyInput();
+        public boolean isInDraggingFinger();
         public void onPhantomUpEvent(long eventTime);
         public void cancelTrackingForAction();
     }
@@ -193,13 +193,13 @@
         }
     }
 
-    public boolean isAnyInSlidingKeyInput() {
+    public boolean isAnyInDraggingFinger() {
         synchronized (mExpandableArrayOfActivePointers) {
             final ArrayList<Element> expandableArray = mExpandableArrayOfActivePointers;
             final int arraySize = mArraySize;
             for (int index = 0; index < arraySize; index++) {
                 final Element element = expandableArray.get(index);
-                if (element.isInSlidingKeyInput()) {
+                if (element.isInDraggingFinger()) {
                     return true;
                 }
             }
diff --git a/java/src/com/android/inputmethod/keyboard/internal/ScrollViewWithNotifier.java b/java/src/com/android/inputmethod/keyboard/internal/ScrollViewWithNotifier.java
deleted file mode 100644
index d1ccdc7..0000000
--- a/java/src/com/android/inputmethod/keyboard/internal/ScrollViewWithNotifier.java
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.keyboard.internal;
-
-import android.content.Context;
-import android.util.AttributeSet;
-import android.widget.ScrollView;
-
-/**
- * This is an extended {@link ScrollView} that can notify
- * {@link ScrollView#onScrollChanged(int,int,int,int} and
- * {@link ScrollView#onOverScrolled(int,int,int,int)} to a content view.
- */
-public class ScrollViewWithNotifier extends ScrollView {
-    private ScrollListener mScrollListener = EMPTY_LISTER;
-
-    public interface ScrollListener {
-        public void notifyScrollChanged(int scrollX, int scrollY, int oldX, int oldY);
-        public void notifyOverScrolled(int scrollX, int scrollY, boolean clampedX,
-                boolean clampedY);
-    }
-
-    private static final ScrollListener EMPTY_LISTER = new ScrollListener() {
-        @Override
-        public void notifyScrollChanged(int scrollX, int scrollY, int oldX, int oldY) {}
-        @Override
-        public void notifyOverScrolled(int scrollX, int scrollY, boolean clampedX,
-                boolean clampedY) {}
-    };
-
-    public ScrollViewWithNotifier(final Context context, final AttributeSet attrs) {
-        super(context, attrs);
-    }
-
-    @Override
-    protected void onScrollChanged(final int scrollX, final int scrollY, final int oldX,
-            final int oldY) {
-        super.onScrollChanged(scrollX, scrollY, oldX, oldY);
-        mScrollListener.notifyScrollChanged(scrollX, scrollY, oldX, oldY);
-    }
-
-    @Override
-    protected void onOverScrolled(final int scrollX, final int scrollY, final boolean clampedX,
-            final boolean clampedY) {
-        super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
-        mScrollListener.notifyOverScrolled(scrollX, scrollY, clampedX, clampedY);
-    }
-
-    public void setScrollListener(final ScrollListener listener) {
-        mScrollListener = listener;
-    }
-}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/SlidingKeyInputPreview.java b/java/src/com/android/inputmethod/keyboard/internal/SlidingKeyInputDrawingPreview.java
similarity index 92%
rename from java/src/com/android/inputmethod/keyboard/internal/SlidingKeyInputPreview.java
rename to java/src/com/android/inputmethod/keyboard/internal/SlidingKeyInputDrawingPreview.java
index 2787ebf..76cb891 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/SlidingKeyInputPreview.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/SlidingKeyInputDrawingPreview.java
@@ -29,7 +29,7 @@
 /**
  * Draw rubber band preview graphics during sliding key input.
  */
-public final class SlidingKeyInputPreview extends AbstractDrawingPreview {
+public final class SlidingKeyInputDrawingPreview extends AbstractDrawingPreview {
     private final float mPreviewBodyRadius;
 
     private boolean mShowsSlidingKeyInputPreview;
@@ -40,7 +40,8 @@
     private final RoundedLine mRoundedLine = new RoundedLine();
     private final Paint mPaint = new Paint();
 
-    public SlidingKeyInputPreview(final View drawingView, final TypedArray mainKeyboardViewAttr) {
+    public SlidingKeyInputDrawingPreview(final View drawingView,
+            final TypedArray mainKeyboardViewAttr) {
         super(drawingView);
         final int previewColor = mainKeyboardViewAttr.getColor(
                 R.styleable.MainKeyboardView_slidingKeyInputPreviewColor, 0);
@@ -61,6 +62,11 @@
         mPaint.setColor(previewColor);
     }
 
+    @Override
+    public void onDeallocateMemory() {
+        // Nothing to do here.
+    }
+
     public void dismissSlidingKeyInputPreview() {
         mShowsSlidingKeyInputPreview = false;
         getDrawingView().invalidate();
diff --git a/java/src/com/android/inputmethod/keyboard/internal/TimerHandler.java b/java/src/com/android/inputmethod/keyboard/internal/TimerHandler.java
new file mode 100644
index 0000000..3298a3f
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/TimerHandler.java
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.os.Message;
+import android.os.SystemClock;
+import android.view.ViewConfiguration;
+
+import com.android.inputmethod.keyboard.Key;
+import com.android.inputmethod.keyboard.PointerTracker;
+import com.android.inputmethod.keyboard.PointerTracker.TimerProxy;
+import com.android.inputmethod.keyboard.internal.TimerHandler.Callbacks;
+import com.android.inputmethod.latin.Constants;
+import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
+
+// TODO: Separate this class into KeyTimerHandler and BatchInputTimerHandler or so.
+public final class TimerHandler extends LeakGuardHandlerWrapper<Callbacks> implements TimerProxy {
+    public interface Callbacks {
+        public void startWhileTypingFadeinAnimation();
+        public void startWhileTypingFadeoutAnimation();
+        public void onLongPress(PointerTracker tracker);
+    }
+
+    private static final int MSG_TYPING_STATE_EXPIRED = 0;
+    private static final int MSG_REPEAT_KEY = 1;
+    private static final int MSG_LONGPRESS_KEY = 2;
+    private static final int MSG_LONGPRESS_SHIFT_KEY = 3;
+    private static final int MSG_DOUBLE_TAP_SHIFT_KEY = 4;
+    private static final int MSG_UPDATE_BATCH_INPUT = 5;
+
+    private final int mIgnoreAltCodeKeyTimeout;
+    private final int mGestureRecognitionUpdateTime;
+
+    public TimerHandler(final Callbacks ownerInstance, final int ignoreAltCodeKeyTimeout,
+            final int gestureRecognitionUpdateTime) {
+        super(ownerInstance);
+        mIgnoreAltCodeKeyTimeout = ignoreAltCodeKeyTimeout;
+        mGestureRecognitionUpdateTime = gestureRecognitionUpdateTime;
+    }
+
+    @Override
+    public void handleMessage(final Message msg) {
+        final Callbacks callbacks = getOwnerInstance();
+        if (callbacks == null) {
+            return;
+        }
+        final PointerTracker tracker = (PointerTracker) msg.obj;
+        switch (msg.what) {
+        case MSG_TYPING_STATE_EXPIRED:
+            callbacks.startWhileTypingFadeinAnimation();
+            break;
+        case MSG_REPEAT_KEY:
+            tracker.onKeyRepeat(msg.arg1 /* code */, msg.arg2 /* repeatCount */);
+            break;
+        case MSG_LONGPRESS_KEY:
+        case MSG_LONGPRESS_SHIFT_KEY:
+            cancelLongPressTimers();
+            callbacks.onLongPress(tracker);
+            break;
+        case MSG_UPDATE_BATCH_INPUT:
+            tracker.updateBatchInputByTimer(SystemClock.uptimeMillis());
+            startUpdateBatchInputTimer(tracker);
+            break;
+        }
+    }
+
+    @Override
+    public void startKeyRepeatTimerOf(final PointerTracker tracker, final int repeatCount,
+            final int delay) {
+        final Key key = tracker.getKey();
+        if (key == null || delay == 0) {
+            return;
+        }
+        sendMessageDelayed(
+                obtainMessage(MSG_REPEAT_KEY, key.getCode(), repeatCount, tracker), delay);
+    }
+
+    private void cancelKeyRepeatTimerOf(final PointerTracker tracker) {
+        removeMessages(MSG_REPEAT_KEY, tracker);
+    }
+
+    public void cancelKeyRepeatTimers() {
+        removeMessages(MSG_REPEAT_KEY);
+    }
+
+    // TODO: Suppress layout changes in key repeat mode
+    public boolean isInKeyRepeat() {
+        return hasMessages(MSG_REPEAT_KEY);
+    }
+
+    @Override
+    public void startLongPressTimerOf(final PointerTracker tracker, final int delay) {
+        final Key key = tracker.getKey();
+        if (key == null) {
+            return;
+        }
+        // Use a separate message id for long pressing shift key, because long press shift key
+        // timers should be canceled when other key is pressed.
+        final int messageId = (key.getCode() == Constants.CODE_SHIFT)
+                ? MSG_LONGPRESS_SHIFT_KEY : MSG_LONGPRESS_KEY;
+        sendMessageDelayed(obtainMessage(messageId, tracker), delay);
+    }
+
+    @Override
+    public void cancelLongPressTimerOf(final PointerTracker tracker) {
+        removeMessages(MSG_LONGPRESS_KEY, tracker);
+        removeMessages(MSG_LONGPRESS_SHIFT_KEY, tracker);
+    }
+
+    @Override
+    public void cancelLongPressShiftKeyTimers() {
+        removeMessages(MSG_LONGPRESS_SHIFT_KEY);
+    }
+
+    private void cancelLongPressTimers() {
+        removeMessages(MSG_LONGPRESS_KEY);
+        removeMessages(MSG_LONGPRESS_SHIFT_KEY);
+    }
+
+    @Override
+    public void startTypingStateTimer(final Key typedKey) {
+        if (typedKey.isModifier() || typedKey.altCodeWhileTyping()) {
+            return;
+        }
+
+        final boolean isTyping = isTypingState();
+        removeMessages(MSG_TYPING_STATE_EXPIRED);
+        final Callbacks callbacks = getOwnerInstance();
+        if (callbacks == null) {
+            return;
+        }
+
+        // When user hits the space or the enter key, just cancel the while-typing timer.
+        final int typedCode = typedKey.getCode();
+        if (typedCode == Constants.CODE_SPACE || typedCode == Constants.CODE_ENTER) {
+            if (isTyping) {
+                callbacks.startWhileTypingFadeinAnimation();
+            }
+            return;
+        }
+
+        sendMessageDelayed(
+                obtainMessage(MSG_TYPING_STATE_EXPIRED), mIgnoreAltCodeKeyTimeout);
+        if (isTyping) {
+            return;
+        }
+        callbacks.startWhileTypingFadeoutAnimation();
+    }
+
+    @Override
+    public boolean isTypingState() {
+        return hasMessages(MSG_TYPING_STATE_EXPIRED);
+    }
+
+    @Override
+    public void startDoubleTapShiftKeyTimer() {
+        sendMessageDelayed(obtainMessage(MSG_DOUBLE_TAP_SHIFT_KEY),
+                ViewConfiguration.getDoubleTapTimeout());
+    }
+
+    @Override
+    public void cancelDoubleTapShiftKeyTimer() {
+        removeMessages(MSG_DOUBLE_TAP_SHIFT_KEY);
+    }
+
+    @Override
+    public boolean isInDoubleTapShiftKeyTimeout() {
+        return hasMessages(MSG_DOUBLE_TAP_SHIFT_KEY);
+    }
+
+    @Override
+    public void cancelKeyTimersOf(final PointerTracker tracker) {
+        cancelKeyRepeatTimerOf(tracker);
+        cancelLongPressTimerOf(tracker);
+    }
+
+    public void cancelAllKeyTimers() {
+        cancelKeyRepeatTimers();
+        cancelLongPressTimers();
+    }
+
+    @Override
+    public void startUpdateBatchInputTimer(final PointerTracker tracker) {
+        if (mGestureRecognitionUpdateTime <= 0) {
+            return;
+        }
+        removeMessages(MSG_UPDATE_BATCH_INPUT, tracker);
+        sendMessageDelayed(obtainMessage(MSG_UPDATE_BATCH_INPUT, tracker),
+                mGestureRecognitionUpdateTime);
+    }
+
+    @Override
+    public void cancelUpdateBatchInputTimer(final PointerTracker tracker) {
+        removeMessages(MSG_UPDATE_BATCH_INPUT, tracker);
+    }
+
+    @Override
+    public void cancelAllUpdateBatchInputTimers() {
+        removeMessages(MSG_UPDATE_BATCH_INPUT);
+    }
+
+    public void cancelAllMessages() {
+        cancelAllKeyTimers();
+        cancelAllUpdateBatchInputTimers();
+    }
+}
diff --git a/java/src/com/android/inputmethod/keyboard/internal/TypingTimeRecorder.java b/java/src/com/android/inputmethod/keyboard/internal/TypingTimeRecorder.java
new file mode 100644
index 0000000..9593f71
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/TypingTimeRecorder.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+public final class TypingTimeRecorder {
+    private final int mStaticTimeThresholdAfterFastTyping; // msec
+    private final int mSuppressKeyPreviewAfterBatchInputDuration;
+    private long mLastTypingTime;
+    private long mLastLetterTypingTime;
+    private long mLastBatchInputTime;
+
+    public TypingTimeRecorder(final int staticTimeThresholdAfterFastTyping,
+            final int suppressKeyPreviewAfterBatchInputDuration) {
+        mStaticTimeThresholdAfterFastTyping = staticTimeThresholdAfterFastTyping;
+        mSuppressKeyPreviewAfterBatchInputDuration = suppressKeyPreviewAfterBatchInputDuration;
+    }
+
+    public boolean isInFastTyping(final long eventTime) {
+        final long elapsedTimeSinceLastLetterTyping = eventTime - mLastLetterTypingTime;
+        return elapsedTimeSinceLastLetterTyping < mStaticTimeThresholdAfterFastTyping;
+    }
+
+    private boolean wasLastInputTyping() {
+        return mLastTypingTime >= mLastBatchInputTime;
+    }
+
+    public void onCodeInput(final int code, final long eventTime) {
+        // Record the letter typing time when
+        // 1. Letter keys are typed successively without any batch input in between.
+        // 2. A letter key is typed within the threshold time since the last any key typing.
+        // 3. A non-letter key is typed within the threshold time since the last letter key typing.
+        if (Character.isLetter(code)) {
+            if (wasLastInputTyping()
+                    || eventTime - mLastTypingTime < mStaticTimeThresholdAfterFastTyping) {
+                mLastLetterTypingTime = eventTime;
+            }
+        } else {
+            if (eventTime - mLastLetterTypingTime < mStaticTimeThresholdAfterFastTyping) {
+                // This non-letter typing should be treated as a part of fast typing.
+                mLastLetterTypingTime = eventTime;
+            }
+        }
+        mLastTypingTime = eventTime;
+    }
+
+    public void onEndBatchInput(final long eventTime) {
+        mLastBatchInputTime = eventTime;
+    }
+
+    public long getLastLetterTypingTime() {
+        return mLastLetterTypingTime;
+    }
+
+    public boolean needsToSuppressKeyPreviewPopup(final long eventTime) {
+        return !wasLastInputTyping()
+                && eventTime - mLastBatchInputTime < mSuppressKeyPreviewAfterBatchInputDuration;
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java b/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java
index 463d093..1aee22b 100644
--- a/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java
+++ b/java/src/com/android/inputmethod/latin/AbstractDictionaryWriter.java
@@ -21,21 +21,19 @@
 
 import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 
 import java.io.File;
 import java.io.IOException;
 import java.util.Map;
 
-// TODO: Quit extending Dictionary after implementing dynamic binary dictionary.
-abstract public class AbstractDictionaryWriter extends Dictionary {
+abstract public class AbstractDictionaryWriter {
     /** Used for Log actions from this class */
     private static final String TAG = AbstractDictionaryWriter.class.getSimpleName();
 
     private final Context mContext;
 
-    public AbstractDictionaryWriter(final Context context, final String dictType) {
-        super(dictType);
+    public AbstractDictionaryWriter(final Context context) {
         mContext = context;
     }
 
@@ -55,20 +53,18 @@
 
     // TODO: Remove lastModifiedTime after making binary dictionary support forgetting curve.
     abstract public void addBigramWords(final String word0, final String word1,
-            final int frequency, final boolean isValid,
-            final long lastModifiedTime);
+            final int frequency, final boolean isValid, final long lastModifiedTime);
 
     abstract public void removeBigramWords(final String word0, final String word1);
 
     abstract protected void writeDictionary(final DictEncoder dictEncoder,
             final Map<String, String> attributeMap) throws IOException, UnsupportedFormatException;
 
-    public void write(final String fileName, final Map<String, String> attributeMap) {
-        final String tempFileName = fileName + ".temp";
-        final File file = new File(mContext.getFilesDir(), fileName);
-        final File tempFile = new File(mContext.getFilesDir(), tempFileName);
+    public void write(final File file, final Map<String, String> attributeMap) {
+        final String tempFilePath = file.getAbsolutePath() + ".temp";
+        final File tempFile = new File(tempFilePath);
         try {
-            final DictEncoder dictEncoder = new Ver3DictEncoder(tempFile);
+            final DictEncoder dictEncoder = new Ver2DictEncoder(tempFile);
             writeDictionary(dictEncoder, attributeMap);
             tempFile.renameTo(file);
         } catch (IOException e) {
diff --git a/java/src/com/android/inputmethod/latin/AssetFileAddress.java b/java/src/com/android/inputmethod/latin/AssetFileAddress.java
index 8751925..fd6c24d 100644
--- a/java/src/com/android/inputmethod/latin/AssetFileAddress.java
+++ b/java/src/com/android/inputmethod/latin/AssetFileAddress.java
@@ -16,6 +16,8 @@
 
 package com.android.inputmethod.latin;
 
+import com.android.inputmethod.latin.utils.FileUtils;
+
 import java.io.File;
 
 /**
@@ -52,4 +54,12 @@
         if (!f.isFile()) return null;
         return new AssetFileAddress(filename, offset, length);
     }
+
+    public boolean pointsToPhysicalFile() {
+        return 0 == mOffset;
+    }
+
+    public void deleteUnderlyingFile() {
+        FileUtils.deleteRecursively(new File(mFilename));
+    }
 }
diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index fd29698..95ac3e2 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -26,6 +26,7 @@
 import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.JniUtils;
 import com.android.inputmethod.latin.utils.StringUtils;
+import com.android.inputmethod.latin.utils.UnigramProperty;
 
 import java.io.File;
 import java.util.ArrayList;
@@ -57,6 +58,21 @@
     @UsedForTesting
     public static final String MAX_BIGRAM_COUNT_QUERY = "MAX_BIGRAM_COUNT";
 
+    public static final int NOT_A_VALID_TIMESTAMP = -1;
+
+    // Format to get unigram flags from native side via getUnigramPropertyNative().
+    private static final int FORMAT_UNIGRAM_PROPERTY_OUTPUT_FLAG_COUNT = 4;
+    private static final int FORMAT_UNIGRAM_PROPERTY_IS_NOT_A_WORD_INDEX = 0;
+    private static final int FORMAT_UNIGRAM_PROPERTY_IS_BLACKLISTED_INDEX = 1;
+    private static final int FORMAT_UNIGRAM_PROPERTY_HAS_BIGRAMS_INDEX = 2;
+    private static final int FORMAT_UNIGRAM_PROPERTY_HAS_SHORTCUTS_INDEX = 3;
+
+    // Format to get unigram historical info from native side via getUnigramPropertyNative().
+    private static final int FORMAT_UNIGRAM_PROPERTY_OUTPUT_HISTORICAL_INFO_COUNT = 3;
+    private static final int FORMAT_UNIGRAM_PROPERTY_TIMESTAMP_INDEX = 0;
+    private static final int FORMAT_UNIGRAM_PROPERTY_LEVEL_INDEX = 1;
+    private static final int FORMAT_UNIGRAM_PROPERTY_COUNT_INDEX = 2;
+
     private long mNativeDict;
     private final Locale mLocale;
     private final long mDictSize;
@@ -123,8 +139,13 @@
     private static native boolean needsToRunGCNative(long dict, boolean mindsBlockByGC);
     private static native void flushWithGCNative(long dict, String filePath);
     private static native void closeNative(long dict);
+    private static native int getFormatVersionNative(long dict);
     private static native int getProbabilityNative(long dict, int[] word);
     private static native int getBigramProbabilityNative(long dict, int[] word0, int[] word1);
+    private static native void getUnigramPropertyNative(long dict, int[] word,
+            int[] outCodePoints, boolean[] outFlags, int[] outProbability,
+            int[] outHistoricalInfo, ArrayList<int[]> outShortcutTargets,
+            ArrayList<Integer> outShortcutProbabilities);
     private static native int getSuggestionsNative(long dict, long proximityInfo,
             long traverseSession, int[] xCoordinates, int[] yCoordinates, int[] times,
             int[] pointerIds, int[] inputCodePoints, int inputSize, int commitPoint,
@@ -133,10 +154,14 @@
             int[] outputAutoCommitFirstWordConfidence);
     private static native float calcNormalizedScoreNative(int[] before, int[] after, int score);
     private static native int editDistanceNative(int[] before, int[] after);
-    private static native void addUnigramWordNative(long dict, int[] word, int probability);
+    private static native void addUnigramWordNative(long dict, int[] word, int probability,
+            int[] shortcutTarget, int shortcutProbability, boolean isNotAWord,
+            boolean isBlacklisted, int timestamp);
     private static native void addBigramWordsNative(long dict, int[] word0, int[] word1,
-            int probability);
+            int probability, int timestamp);
     private static native void removeBigramWordsNative(long dict, int[] word0, int[] word1);
+    private static native int addMultipleDictionaryEntriesNative(long dict,
+            LanguageModelParam[] languageModelParams, int startIndex);
     private static native int calculateProbabilityNative(long dict, int unigramProbability,
             int bigramProbability);
     private static native String getPropertyNative(long dict, String query);
@@ -235,6 +260,10 @@
         return mNativeDict != 0;
     }
 
+    public int getFormatVersion() {
+        return getFormatVersionNative(mNativeDict);
+    }
+
     public static float calcNormalizedScore(final String before, final String after,
             final int score) {
         return calcNormalizedScoreNative(StringUtils.toCodePointArray(before),
@@ -274,23 +303,55 @@
         return getBigramProbabilityNative(mNativeDict, codePoints0, codePoints1);
     }
 
-    // Add a unigram entry to binary dictionary in native code.
-    public void addUnigramWord(final String word, final int probability) {
+    @UsedForTesting
+    public UnigramProperty getUnigramProperty(final String word) {
+        if (TextUtils.isEmpty(word)) {
+            return null;
+        }
+        final int[] codePoints = StringUtils.toCodePointArray(word);
+        final int[] outCodePoints = new int[MAX_WORD_LENGTH];
+        final boolean[] outFlags = new boolean[FORMAT_UNIGRAM_PROPERTY_OUTPUT_FLAG_COUNT];
+        final int[] outProbability = new int[1];
+        final int[] outHistoricalInfo =
+                new int[FORMAT_UNIGRAM_PROPERTY_OUTPUT_HISTORICAL_INFO_COUNT];
+        final ArrayList<int[]> outShortcutTargets = CollectionUtils.newArrayList();
+        final ArrayList<Integer> outShortcutProbabilities = CollectionUtils.newArrayList();
+        getUnigramPropertyNative(mNativeDict, codePoints, outCodePoints, outFlags, outProbability,
+                outHistoricalInfo, outShortcutTargets, outShortcutProbabilities);
+        return new UnigramProperty(codePoints,
+                outFlags[FORMAT_UNIGRAM_PROPERTY_IS_NOT_A_WORD_INDEX],
+                outFlags[FORMAT_UNIGRAM_PROPERTY_IS_BLACKLISTED_INDEX],
+                outFlags[FORMAT_UNIGRAM_PROPERTY_HAS_BIGRAMS_INDEX],
+                outFlags[FORMAT_UNIGRAM_PROPERTY_HAS_SHORTCUTS_INDEX], outProbability[0],
+                outHistoricalInfo[FORMAT_UNIGRAM_PROPERTY_TIMESTAMP_INDEX],
+                outHistoricalInfo[FORMAT_UNIGRAM_PROPERTY_LEVEL_INDEX],
+                outHistoricalInfo[FORMAT_UNIGRAM_PROPERTY_COUNT_INDEX],
+                outShortcutTargets, outShortcutProbabilities);
+    }
+
+    // Add a unigram entry to binary dictionary with unigram attributes in native code.
+    public void addUnigramWord(final String word, final int probability,
+            final String shortcutTarget, final int shortcutProbability, final boolean isNotAWord,
+            final boolean isBlacklisted, final int timestamp) {
         if (TextUtils.isEmpty(word)) {
             return;
         }
         final int[] codePoints = StringUtils.toCodePointArray(word);
-        addUnigramWordNative(mNativeDict, codePoints, probability);
+        final int[] shortcutTargetCodePoints = (shortcutTarget != null) ?
+                StringUtils.toCodePointArray(shortcutTarget) : null;
+        addUnigramWordNative(mNativeDict, codePoints, probability, shortcutTargetCodePoints,
+                shortcutProbability, isNotAWord, isBlacklisted, timestamp);
     }
 
-    // Add a bigram entry to binary dictionary in native code.
-    public void addBigramWords(final String word0, final String word1, final int probability) {
+    // Add a bigram entry to binary dictionary with timestamp in native code.
+    public void addBigramWords(final String word0, final String word1, final int probability,
+            final int timestamp) {
         if (TextUtils.isEmpty(word0) || TextUtils.isEmpty(word1)) {
             return;
         }
         final int[] codePoints0 = StringUtils.toCodePointArray(word0);
         final int[] codePoints1 = StringUtils.toCodePointArray(word1);
-        addBigramWordsNative(mNativeDict, codePoints0, codePoints1, probability);
+        addBigramWordsNative(mNativeDict, codePoints0, codePoints1, probability, timestamp);
     }
 
     // Remove a bigram entry form binary dictionary in native code.
@@ -303,10 +364,71 @@
         removeBigramWordsNative(mNativeDict, codePoints0, codePoints1);
     }
 
+    public static class LanguageModelParam {
+        public final int[] mWord0;
+        public final int[] mWord1;
+        // TODO: this needs to be a list of shortcuts
+        public final int[] mShortcutTarget;
+        public final int mUnigramProbability;
+        public final int mBigramProbability;
+        public final int mShortcutProbability;
+        public final boolean mIsNotAWord;
+        public final boolean mIsBlacklisted;
+        public final int mTimestamp;
+
+        // Constructor for unigram. TODO: support shortcuts
+        public LanguageModelParam(final String word, final int unigramProbability,
+                final int timestamp) {
+            mWord0 = null;
+            mWord1 = StringUtils.toCodePointArray(word);
+            mShortcutTarget = null;
+            mUnigramProbability = unigramProbability;
+            mBigramProbability = NOT_A_PROBABILITY;
+            mShortcutProbability = NOT_A_PROBABILITY;
+            mIsNotAWord = false;
+            mIsBlacklisted = false;
+            mTimestamp = timestamp;
+        }
+
+        // Constructor for unigram and bigram.
+        public LanguageModelParam(final String word0, final String word1,
+                final int unigramProbability, final int bigramProbability,
+                final int timestamp) {
+            mWord0 = StringUtils.toCodePointArray(word0);
+            mWord1 = StringUtils.toCodePointArray(word1);
+            mShortcutTarget = null;
+            mUnigramProbability = unigramProbability;
+            mBigramProbability = bigramProbability;
+            mShortcutProbability = NOT_A_PROBABILITY;
+            mIsNotAWord = false;
+            mIsBlacklisted = false;
+            mTimestamp = timestamp;
+        }
+    }
+
+    public void addMultipleDictionaryEntries(final LanguageModelParam[] languageModelParams) {
+        if (!isValidDictionary()) return;
+        int processedParamCount = 0;
+        while (processedParamCount < languageModelParams.length) {
+            if (needsToRunGC(true /* mindsBlockByGC */)) {
+                flushWithGC();
+            }
+            processedParamCount = addMultipleDictionaryEntriesNative(mNativeDict,
+                    languageModelParams, processedParamCount);
+            if (processedParamCount <= 0) {
+                return;
+            }
+        }
+
+    }
+
     private void reopen() {
         close();
         final File dictFile = new File(mDictFilePath);
-        mNativeDict = openNative(dictFile.getAbsolutePath(), 0 /* startOffset */,
+        // WARNING: Because we pass 0 as the offset and file.length() as the length, this can
+        // only be called for actual files. Right now it's only called by the flush() family of
+        // functions, which require an updatable dictionary, so it's okay. But beware.
+        loadDictionary(dictFile.getAbsolutePath(), 0 /* startOffset */,
                 dictFile.length(), true /* isUpdatable */);
     }
 
diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java b/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java
index 722a829..b4382bc 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionaryFileDumper.java
@@ -98,7 +98,7 @@
      * This creates a URI builder able to build a URI pointing to the dictionary
      * pack content provider for a specific dictionary id.
      */
-    private static Uri.Builder getProviderUriBuilder(final String path) {
+    public static Uri.Builder getProviderUriBuilder(final String path) {
         return new Uri.Builder().scheme(ContentResolver.SCHEME_CONTENT)
                 .authority(DictionaryPackConstants.AUTHORITY).appendPath(path);
     }
@@ -339,15 +339,25 @@
         Log.e(TAG, "Could not copy a word list. Will not be able to use it.");
         // If we can't copy it we should warn the dictionary provider so that it can mark it
         // as invalid.
-        wordListUriBuilder.appendQueryParameter(QUERY_PARAMETER_DELETE_RESULT,
-                QUERY_PARAMETER_FAILURE);
+        reportBrokenFileToDictionaryProvider(providerClient, clientId, wordlistId);
+    }
+
+    public static boolean reportBrokenFileToDictionaryProvider(
+            final ContentProviderClient providerClient, final String clientId,
+            final String wordlistId) {
         try {
+            final Uri.Builder wordListUriBuilder = getContentUriBuilderForType(clientId,
+                    providerClient, QUERY_PATH_DATAFILE, wordlistId /* extraPath */);
+            wordListUriBuilder.appendQueryParameter(QUERY_PARAMETER_DELETE_RESULT,
+                    QUERY_PARAMETER_FAILURE);
             if (0 >= providerClient.delete(wordListUriBuilder.build(), null, null)) {
-                Log.e(TAG, "In addition, we were unable to delete it.");
+                Log.e(TAG, "Unable to delete a word list.");
             }
         } catch (RemoteException e) {
-            Log.e(TAG, "In addition, communication with the dictionary provider was cut", e);
+            Log.e(TAG, "Communication with the dictionary provider was cut", e);
+            return false;
         }
+        return true;
     }
 
     // Ideally the two following methods should be merged, but AssetFileDescriptor does not
@@ -432,8 +442,9 @@
 
         // Actually copy the file
         final byte[] buffer = new byte[FILE_READ_BUFFER_SIZE];
-        for (int readBytes = input.read(buffer); readBytes >= 0; readBytes = input.read(buffer))
+        for (int readBytes = input.read(buffer); readBytes >= 0; readBytes = input.read(buffer)) {
             output.write(buffer, 0, readBytes);
+        }
         input.close();
     }
 
@@ -478,8 +489,7 @@
      * @param context the context for resources and providers.
      * @param clientId the client ID to use.
      */
-    public static void initializeClientRecordHelper(final Context context,
-            final String clientId) {
+    public static void initializeClientRecordHelper(final Context context, final String clientId) {
         try {
             final ContentProviderClient client = context.getContentResolver().
                     acquireContentProviderClient(getProviderUriBuilder("").build());
diff --git a/java/src/com/android/inputmethod/latin/Constants.java b/java/src/com/android/inputmethod/latin/Constants.java
index 9a96530..00b54f5 100644
--- a/java/src/com/android/inputmethod/latin/Constants.java
+++ b/java/src/com/android/inputmethod/latin/Constants.java
@@ -70,38 +70,47 @@
 
         public static final class ExtraValue {
             /**
-             * The subtype extra value used to indicate that the subtype keyboard layout is capable
-             * for typing ASCII characters.
+             * The subtype extra value used to indicate that this subtype is capable of
+             * entering ASCII characters.
              */
             public static final String ASCII_CAPABLE = "AsciiCapable";
 
             /**
-             * The subtype extra value used to indicate that the subtype keyboard layout is capable
-             * for typing EMOJI characters.
+             * The subtype extra value used to indicate that this subtype is enabled
+             * when the default subtype is not marked as ascii capable.
+             */
+            public static final String ENABLED_WHEN_DEFAULT_IS_NOT_ASCII_CAPABLE =
+                    "EnabledWhenDefaultIsNotAsciiCapable";
+
+            /**
+             * The subtype extra value used to indicate that this subtype is capable of
+             * entering emoji characters.
              */
             public static final String EMOJI_CAPABLE = "EmojiCapable";
+
             /**
-             * The subtype extra value used to indicate that the subtype require network connection
-             * to work.
+             * The subtype extra value used to indicate that this subtype requires a network
+             * connection to work.
              */
             public static final String REQ_NETWORK_CONNECTIVITY = "requireNetworkConnectivity";
 
             /**
-             * The subtype extra value used to indicate that the subtype display name contains "%s"
-             * for replacement mark and it should be replaced by this extra value.
+             * The subtype extra value used to indicate that the display name of this subtype
+             * contains a "%s" for printf-like replacement and it should be replaced by
+             * this extra value.
              * This extra value is supported on JellyBean and later.
              */
             public static final String UNTRANSLATABLE_STRING_IN_SUBTYPE_NAME =
                     "UntranslatableReplacementStringInSubtypeName";
 
             /**
-             * The subtype extra value used to indicate that the subtype keyboard layout set name.
+             * The subtype extra value used to indicate this subtype keyboard layout set name.
              * This extra value is private to LatinIME.
              */
             public static final String KEYBOARD_LAYOUT_SET = "KeyboardLayoutSet";
 
             /**
-             * The subtype extra value used to indicate that the subtype is additional subtype
+             * The subtype extra value used to indicate that this subtype is an additional subtype
              * that the user defined. This extra value is private to LatinIME.
              */
             public static final String IS_ADDITIONAL_SUBTYPE = "isAdditionalSubtype";
@@ -124,6 +133,8 @@
          * {@link android.text.TextUtils#CAP_MODE_WORDS}, and
          * {@link android.text.TextUtils#CAP_MODE_SENTENCES}.
          */
+        // TODO: Straighten this out. It's bizarre to have to use android.text.TextUtils.CAP_MODE_*
+        // except for OFF that is in Constants.TextUtils.
         public static final int CAP_MODE_OFF = 0;
 
         private TextUtils() {
@@ -132,7 +143,7 @@
     }
 
     public static final int NOT_A_CODE = -1;
-
+    public static final int NOT_A_CURSOR_POSITION = -1;
     public static final int NOT_A_COORDINATE = -1;
     public static final int SUGGESTION_STRIP_COORDINATE = -2;
     public static final int SPELL_CHECKER_COORDINATE = -3;
@@ -145,6 +156,13 @@
     // Must be equal to MAX_WORD_LENGTH in native/jni/src/defines.h
     public static final int DICTIONARY_MAX_WORD_LENGTH = 48;
 
+    // Key events coming any faster than this are long-presses.
+    public static final int LONG_PRESS_MILLISECONDS = 200;
+    // TODO: Set this value appropriately.
+    public static final int GET_SUGGESTED_WORDS_TIMEOUT = 200;
+    // How many continuous deletes at which to start deleting at a higher speed.
+    public static final int DELETE_ACCELERATE_AT = 20;
+
     public static boolean isValidCoordinate(final int coordinate) {
         // Detect {@link NOT_A_COORDINATE}, {@link SUGGESTION_STRIP_COORDINATE},
         // and {@link SPELL_CHECKER_COORDINATE}.
@@ -230,8 +248,23 @@
 
     public static final int MAX_INT_BIT_COUNT = 32;
 
+    /**
+     * Screen metrics (a.k.a. Device form factor) constants of
+     * {@link R.integer#config_screen_metrics}.
+     */
+    public static final int SCREEN_METRICS_SMALL_PHONE = 0;
+    public static final int SCREEN_METRICS_LARGE_PHONE = 1;
+    public static final int SCREEN_METRICS_LARGE_TABLET = 2;
+    public static final int SCREEN_METRICS_SMALL_TABLET = 3;
+
+    /**
+     * Default capacity of gesture points container.
+     * This constant is used by {@link BatchInputArbiter} and etc. to preallocate regions that
+     * contain gesture event points.
+     */
+    public static final int DEFAULT_GESTURE_POINTS_CAPACITY = 128;
+
     private Constants() {
         // This utility class is not publicly instantiable.
     }
-
 }
diff --git a/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java
index 47891c6..a787ef1 100644
--- a/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ContactsBinaryDictionary.java
@@ -16,8 +16,6 @@
 
 package com.android.inputmethod.latin;
 
-import com.android.inputmethod.latin.personalization.AccountUtils;
-
 import android.content.ContentResolver;
 import android.content.Context;
 import android.database.ContentObserver;
@@ -31,8 +29,11 @@
 import android.text.TextUtils;
 import android.util.Log;
 
+import com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.latin.personalization.AccountUtils;
 import com.android.inputmethod.latin.utils.StringUtils;
 
+import java.io.File;
 import java.util.List;
 import java.util.Locale;
 
@@ -44,7 +45,8 @@
     private static final String TAG = ContactsBinaryDictionary.class.getSimpleName();
     private static final String NAME = "contacts";
 
-    private static boolean DEBUG = false;
+    private static final boolean DEBUG = false;
+    private static final boolean DEBUG_DUMP = false;
 
     /**
      * Frequency for contacts information into the dictionary
@@ -71,8 +73,8 @@
     private final boolean mUseFirstLastBigrams;
 
     public ContactsBinaryDictionary(final Context context, final Locale locale) {
-        super(context, getFilenameWithLocale(NAME, locale.toString()), Dictionary.TYPE_CONTACTS,
-                false /* isUpdatable */);
+        super(context, getDictNameWithLocale(NAME, locale), locale,
+                Dictionary.TYPE_CONTACTS, false /* isUpdatable */);
         mLocale = locale;
         mUseFirstLastBigrams = useFirstLastBigramsForLocale(locale);
         registerObserver(context);
@@ -82,6 +84,12 @@
         loadDictionary();
     }
 
+    // Dummy constructor for tests.
+    @UsedForTesting
+    public ContactsBinaryDictionary(final Context context, final Locale locale, final File file) {
+        this(context, locale);
+    }
+
     private synchronized void registerObserver(final Context context) {
         // Perform a managed query. The Activity will handle closing and requerying the cursor
         // when needed.
@@ -168,6 +176,10 @@
             if (isValidName(name)) {
                 addName(name);
                 ++count;
+            } else {
+                if (DEBUG_DUMP) {
+                    Log.d(TAG, "Invalid name: " + name);
+                }
             }
             cursor.moveToNext();
         }
@@ -204,6 +216,9 @@
             if (Character.isLetter(name.codePointAt(i))) {
                 int end = getWordEndPosition(name, len, i);
                 String word = name.substring(i, end);
+                if (DEBUG_DUMP) {
+                    Log.d(TAG, "addName word = " + word);
+                }
                 i = end - 1;
                 // Don't add single letter words, possibly confuses
                 // capitalization of i.
diff --git a/java/src/com/android/inputmethod/latin/Dictionary.java b/java/src/com/android/inputmethod/latin/Dictionary.java
index fa79f5a..e0452484 100644
--- a/java/src/com/android/inputmethod/latin/Dictionary.java
+++ b/java/src/com/android/inputmethod/latin/Dictionary.java
@@ -52,13 +52,10 @@
     public static final String TYPE_CONTACTS = "contacts";
     // User dictionary, the system-managed one.
     public static final String TYPE_USER = "user";
-    // User history dictionary internal to LatinIME. This assumes bigram prediction for now.
+    // User history dictionary internal to LatinIME.
     public static final String TYPE_USER_HISTORY = "history";
-    // Personalization binary dictionary internal to LatinIME.
+    // Personalization dictionary.
     public static final String TYPE_PERSONALIZATION = "personalization";
-    // Personalization prediction dictionary internal to LatinIME's Java code.
-    public static final String TYPE_PERSONALIZATION_PREDICTION_IN_JAVA =
-            "personalization_prediction_in_java";
     public final String mDictType;
 
     public Dictionary(final String dictType) {
diff --git a/java/src/com/android/inputmethod/latin/DictionaryFacilitatorForSuggest.java b/java/src/com/android/inputmethod/latin/DictionaryFacilitatorForSuggest.java
new file mode 100644
index 0000000..c9bcfe3
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/DictionaryFacilitatorForSuggest.java
@@ -0,0 +1,454 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin;
+
+import android.content.Context;
+import android.text.TextUtils;
+import android.util.Log;
+
+import com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.keyboard.ProximityInfo;
+import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+import com.android.inputmethod.latin.personalization.PersonalizationDictionary;
+import com.android.inputmethod.latin.personalization.PersonalizationHelper;
+import com.android.inputmethod.latin.personalization.UserHistoryDictionary;
+import com.android.inputmethod.latin.settings.SettingsValues;
+import com.android.inputmethod.latin.utils.CollectionUtils;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Locale;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+
+// TODO: Consolidate dictionaries in native code.
+public class DictionaryFacilitatorForSuggest {
+    public static final String TAG = DictionaryFacilitatorForSuggest.class.getSimpleName();
+
+    private final Context mContext;
+    private final Locale mLocale;
+
+    private final ConcurrentHashMap<String, Dictionary> mDictionaries =
+            CollectionUtils.newConcurrentHashMap();
+    private HashSet<String> mDictionarySubsetForDebug = null;
+
+    private Dictionary mMainDictionary;
+    private ContactsBinaryDictionary mContactsDictionary;
+    private UserBinaryDictionary mUserDictionary;
+    private UserHistoryDictionary mUserHistoryDictionary;
+    private PersonalizationDictionary mPersonalizationDictionary;
+
+    @UsedForTesting
+    private boolean mIsCurrentlyWaitingForMainDictionary = false;
+
+    public interface DictionaryInitializationListener {
+        public void onUpdateMainDictionaryAvailability(boolean isMainDictionaryAvailable);
+    }
+
+    /**
+     * Creates instance for initialization or when the locale is changed.
+     *
+     * @param context the context
+     * @param locale the locale
+     * @param settingsValues current settings values to control what dictionaries should be used
+     * @param listener the listener
+     * @param oldDictionaryFacilitator the instance having old dictionaries. This is null when the
+     * instance is initially created.
+     */
+    public DictionaryFacilitatorForSuggest(final Context context, final Locale locale,
+            final SettingsValues settingsValues, final DictionaryInitializationListener listener,
+            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator) {
+        mContext = context;
+        mLocale = locale;
+        initForDebug(settingsValues);
+        reloadMainDict(context, locale, listener);
+        setUserDictionary(new UserBinaryDictionary(context, locale));
+        resetAdditionalDictionaries(oldDictionaryFacilitator, settingsValues);
+    }
+
+    /**
+     * Creates instance for when the settings values have been changed.
+     *
+     * @param settingsValues the new settings values
+     * @param oldDictionaryFacilitator the instance having old dictionaries. This must not be null.
+     */
+    //
+    public DictionaryFacilitatorForSuggest(final SettingsValues settingsValues,
+            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator) {
+        mContext = oldDictionaryFacilitator.mContext;
+        mLocale = oldDictionaryFacilitator.mLocale;
+        initForDebug(settingsValues);
+        // Transfer main dictionary.
+        setMainDictionary(oldDictionaryFacilitator.mMainDictionary);
+        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_MAIN);
+        // Transfer user dictionary.
+        setUserDictionary(oldDictionaryFacilitator.mUserDictionary);
+        oldDictionaryFacilitator.removeDictionary(Dictionary.TYPE_USER);
+        // Transfer or create additional dictionaries depending on the settings values.
+        resetAdditionalDictionaries(oldDictionaryFacilitator, settingsValues);
+    }
+
+    @UsedForTesting
+    public DictionaryFacilitatorForSuggest(final Context context, final Locale locale,
+            final ArrayList<String> dictionaryTypes, final HashMap<String, File> dictionaryFiles) {
+        mContext = context;
+        mLocale = locale;
+        for (final String dictType : dictionaryTypes) {
+            if (dictType.equals(Dictionary.TYPE_MAIN)) {
+                final DictionaryCollection mainDictionary =
+                        DictionaryFactory.createMainDictionaryFromManager(context, locale);
+                setMainDictionary(mainDictionary);
+            } else if (dictType.equals(Dictionary.TYPE_USER_HISTORY)) {
+                final UserHistoryDictionary userHistoryDictionary =
+                        PersonalizationHelper.getUserHistoryDictionary(context, locale);
+                // Staring with an empty user history dictionary for testing.
+                // Testing program may populate this dictionary before actual testing.
+                userHistoryDictionary.reloadDictionaryIfRequired();
+                userHistoryDictionary.waitAllTasksForTests();
+                setUserHistoryDictionary(userHistoryDictionary);
+            } else if (dictType.equals(Dictionary.TYPE_PERSONALIZATION)) {
+                final PersonalizationDictionary personalizationDictionary =
+                        PersonalizationHelper.getPersonalizationDictionary(context, locale);
+                // Staring with an empty personalization dictionary for testing.
+                // Testing program may populate this dictionary before actual testing.
+                personalizationDictionary.reloadDictionaryIfRequired();
+                personalizationDictionary.waitAllTasksForTests();
+                setPersonalizationDictionary(personalizationDictionary);
+            } else if (dictType.equals(Dictionary.TYPE_USER)) {
+                final File file = dictionaryFiles.get(dictType);
+                final UserBinaryDictionary userDictionary = new UserBinaryDictionary(
+                        context, locale, file);
+                userDictionary.reloadDictionaryIfRequired();
+                userDictionary.waitAllTasksForTests();
+                setUserDictionary(userDictionary);
+            } else if (dictType.equals(Dictionary.TYPE_CONTACTS)) {
+                final File file = dictionaryFiles.get(dictType);
+                final ContactsBinaryDictionary contactsDictionary = new ContactsBinaryDictionary(
+                        context, locale, file);
+                contactsDictionary.reloadDictionaryIfRequired();
+                contactsDictionary.waitAllTasksForTests();
+                setContactsDictionary(contactsDictionary);
+            } else {
+                throw new RuntimeException("Unknown dictionary type: " + dictType);
+            }
+        }
+    }
+
+    // initialize a debug flag for the personalization
+    private void initForDebug(final SettingsValues settingsValues) {
+        if (settingsValues.mUseOnlyPersonalizationDictionaryForDebug) {
+            mDictionarySubsetForDebug = new HashSet<String>();
+            mDictionarySubsetForDebug.add(Dictionary.TYPE_PERSONALIZATION);
+        }
+    }
+
+    public void close() {
+        final HashSet<Dictionary> dictionaries = CollectionUtils.newHashSet();
+        dictionaries.addAll(mDictionaries.values());
+        for (final Dictionary dictionary : dictionaries) {
+            dictionary.close();
+        }
+    }
+
+    public void reloadMainDict(final Context context, final Locale locale,
+            final DictionaryInitializationListener listener) {
+        mIsCurrentlyWaitingForMainDictionary = true;
+        mMainDictionary = null;
+        if (listener != null) {
+            listener.onUpdateMainDictionaryAvailability(hasMainDictionary());
+        }
+        new Thread("InitializeBinaryDictionary") {
+            @Override
+            public void run() {
+                final DictionaryCollection newMainDict =
+                        DictionaryFactory.createMainDictionaryFromManager(context, locale);
+                setMainDictionary(newMainDict);
+                if (listener != null) {
+                    listener.onUpdateMainDictionaryAvailability(hasMainDictionary());
+                }
+                mIsCurrentlyWaitingForMainDictionary = false;
+            }
+        }.start();
+    }
+
+    // The main dictionary could have been loaded asynchronously.  Don't cache the return value
+    // of this method.
+    public boolean hasMainDictionary() {
+        return null != mMainDictionary && mMainDictionary.isInitialized();
+    }
+
+    @UsedForTesting
+    public boolean isCurrentlyWaitingForMainDictionary() {
+        return mIsCurrentlyWaitingForMainDictionary;
+    }
+
+    private void setMainDictionary(final Dictionary mainDictionary) {
+        mMainDictionary = mainDictionary;
+        addOrReplaceDictionary(Dictionary.TYPE_MAIN, mainDictionary);
+    }
+
+    /**
+     * Sets an optional user dictionary resource to be loaded. The user dictionary is consulted
+     * before the main dictionary, if set. This refers to the system-managed user dictionary.
+     */
+    private void setUserDictionary(final UserBinaryDictionary userDictionary) {
+        mUserDictionary = userDictionary;
+        addOrReplaceDictionary(Dictionary.TYPE_USER, userDictionary);
+    }
+
+    /**
+     * Sets an optional contacts dictionary resource to be loaded. It is also possible to remove
+     * the contacts dictionary by passing null to this method. In this case no contacts dictionary
+     * won't be used.
+     */
+    private void setContactsDictionary(final ContactsBinaryDictionary contactsDictionary) {
+        mContactsDictionary = contactsDictionary;
+        addOrReplaceDictionary(Dictionary.TYPE_CONTACTS, contactsDictionary);
+    }
+
+    private void setUserHistoryDictionary(final UserHistoryDictionary userHistoryDictionary) {
+        mUserHistoryDictionary = userHistoryDictionary;
+        addOrReplaceDictionary(Dictionary.TYPE_USER_HISTORY, userHistoryDictionary);
+    }
+
+    private void setPersonalizationDictionary(
+            final PersonalizationDictionary personalizationDictionary) {
+        mPersonalizationDictionary = personalizationDictionary;
+        addOrReplaceDictionary(Dictionary.TYPE_PERSONALIZATION, personalizationDictionary);
+    }
+
+    /**
+     * Reset dictionaries that can be turned off according to the user settings.
+     *
+     * @param oldDictionaryFacilitator the instance having old dictionaries
+     * @param settingsValues current SettingsValues
+     */
+    private void resetAdditionalDictionaries(
+            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator,
+            final SettingsValues settingsValues) {
+        // Contacts dictionary
+        resetContactsDictionary(null != oldDictionaryFacilitator ?
+                oldDictionaryFacilitator.mContactsDictionary : null, settingsValues);
+        // User history dictionary & Personalization dictionary
+        resetPersonalizedDictionaries(oldDictionaryFacilitator, settingsValues);
+    }
+
+    /**
+     * Set the user history dictionary and personalization dictionary according to the user
+     * settings.
+     *
+     * @param oldDictionaryFacilitator the instance that has been used
+     * @param settingsValues current settingsValues
+     */
+    // TODO: Consolidate resetPersonalizedDictionaries() and resetContactsDictionary(). Call up the
+    // new method for each dictionary.
+    private void resetPersonalizedDictionaries(
+            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator,
+            final SettingsValues settingsValues) {
+        final boolean shouldSetDictionaries = settingsValues.mUsePersonalizedDicts;
+
+        final UserHistoryDictionary oldUserHistoryDictionary = (null == oldDictionaryFacilitator) ?
+                null : oldDictionaryFacilitator.mUserHistoryDictionary;
+        final PersonalizationDictionary oldPersonalizationDictionary =
+                (null == oldDictionaryFacilitator) ? null :
+                        oldDictionaryFacilitator.mPersonalizationDictionary;
+        final UserHistoryDictionary userHistoryDictionaryToUse;
+        final PersonalizationDictionary personalizationDictionaryToUse;
+        if (!shouldSetDictionaries) {
+            userHistoryDictionaryToUse = null;
+            personalizationDictionaryToUse = null;
+        } else {
+            if (null != oldUserHistoryDictionary
+                    && oldUserHistoryDictionary.mLocale.equals(mLocale)) {
+                userHistoryDictionaryToUse = oldUserHistoryDictionary;
+            } else {
+                userHistoryDictionaryToUse =
+                        PersonalizationHelper.getUserHistoryDictionary(mContext, mLocale);
+            }
+            if (null != oldPersonalizationDictionary
+                    && oldPersonalizationDictionary.mLocale.equals(mLocale)) {
+                personalizationDictionaryToUse = oldPersonalizationDictionary;
+            } else {
+                personalizationDictionaryToUse =
+                        PersonalizationHelper.getPersonalizationDictionary(mContext, mLocale);
+            }
+        }
+        setUserHistoryDictionary(userHistoryDictionaryToUse);
+        setPersonalizationDictionary(personalizationDictionaryToUse);
+    }
+
+    /**
+     * Set the contacts dictionary according to the user settings.
+     *
+     * This method takes an optional contacts dictionary to use when the locale hasn't changed
+     * since the contacts dictionary can be opened or closed as necessary depending on the settings.
+     *
+     * @param oldContactsDictionary an optional dictionary to use, or null
+     * @param settingsValues current settingsValues
+     */
+    private void resetContactsDictionary(final ContactsBinaryDictionary oldContactsDictionary,
+            final SettingsValues settingsValues) {
+        final boolean shouldSetDictionary = settingsValues.mUseContactsDict;
+        final ContactsBinaryDictionary dictionaryToUse;
+        if (!shouldSetDictionary) {
+            // Make sure the dictionary is closed. If it is already closed, this is a no-op,
+            // so it's safe to call it anyways.
+            if (null != oldContactsDictionary) oldContactsDictionary.close();
+            dictionaryToUse = null;
+        } else {
+            if (null != oldContactsDictionary) {
+                if (!oldContactsDictionary.mLocale.equals(mLocale)) {
+                    // If the locale has changed then recreate the contacts dictionary. This
+                    // allows locale dependent rules for handling bigram name predictions.
+                    oldContactsDictionary.close();
+                    dictionaryToUse = new ContactsBinaryDictionary(mContext, mLocale);
+                } else {
+                    // Make sure the old contacts dictionary is opened. If it is already open,
+                    // this is a no-op, so it's safe to call it anyways.
+                    oldContactsDictionary.reopen(mContext);
+                    dictionaryToUse = oldContactsDictionary;
+                }
+            } else {
+                dictionaryToUse = new ContactsBinaryDictionary(mContext, mLocale);
+            }
+        }
+        setContactsDictionary(dictionaryToUse);
+    }
+
+    public boolean isUserDictionaryEnabled() {
+        if (mUserDictionary == null) {
+            return false;
+        }
+        return mUserDictionary.mEnabled;
+    }
+
+    public void addWordToUserDictionary(String word) {
+        if (mUserDictionary == null) {
+            return;
+        }
+        mUserDictionary.addWordToUserDictionary(word);
+    }
+
+    public void addToUserHistory(final WordComposer wordComposer, final String previousWord,
+            final String suggestion) {
+        if (mUserHistoryDictionary == null) {
+            return;
+        }
+        final String secondWord;
+        if (wordComposer.wasAutoCapitalized() && !wordComposer.isMostlyCaps()) {
+            secondWord = suggestion.toLowerCase(mLocale);
+        } else {
+            secondWord = suggestion;
+        }
+        // We demote unrecognized words (frequency < 0, below) by specifying them as "invalid".
+        // We don't add words with 0-frequency (assuming they would be profanity etc.).
+        final int maxFreq = getMaxFrequency(suggestion);
+        if (maxFreq == 0) {
+            return;
+        }
+        final boolean isValid = maxFreq > 0;
+        final int timeStamp = (int)TimeUnit.MILLISECONDS.toSeconds((System.currentTimeMillis()));
+        mUserHistoryDictionary.addToDictionary(previousWord, secondWord, isValid, timeStamp);
+    }
+
+    public void cancelAddingUserHistory(final String previousWord, final String committedWord) {
+        if (mUserHistoryDictionary != null) {
+            mUserHistoryDictionary.cancelAddingUserHistory(previousWord, committedWord);
+        }
+    }
+
+    // TODO: Revise the way to fusion suggestion results.
+    public void getSuggestions(final WordComposer composer,
+            final String prevWord, final ProximityInfo proximityInfo,
+            final boolean blockOffensiveWords, final int[] additionalFeaturesOptions,
+            final int sessionId, final Set<SuggestedWordInfo> suggestionSet) {
+        for (final String key : mDictionaries.keySet()) {
+            final Dictionary dictionary = mDictionaries.get(key);
+            suggestionSet.addAll(dictionary.getSuggestionsWithSessionId(composer, prevWord,
+                    proximityInfo, blockOffensiveWords, additionalFeaturesOptions, sessionId));
+        }
+    }
+
+    public boolean isValidMainDictWord(final String word) {
+        if (TextUtils.isEmpty(word) || !hasMainDictionary()) {
+            return false;
+        }
+        return mMainDictionary.isValidWord(word);
+    }
+
+    public boolean isValidWord(final String word, final boolean ignoreCase) {
+        if (TextUtils.isEmpty(word)) {
+            return false;
+        }
+        final String lowerCasedWord = word.toLowerCase(mLocale);
+        for (final String key : mDictionaries.keySet()) {
+            final Dictionary dictionary = mDictionaries.get(key);
+            // It's unclear how realistically 'dictionary' can be null, but the monkey is somehow
+            // managing to get null in here. Presumably the language is changing to a language with
+            // no main dictionary and the monkey manages to type a whole word before the thread
+            // that reads the dictionary is started or something?
+            // Ideally the passed map would come out of a {@link java.util.concurrent.Future} and
+            // would be immutable once it's finished initializing, but concretely a null test is
+            // probably good enough for the time being.
+            if (null == dictionary) continue;
+            if (dictionary.isValidWord(word)
+                    || (ignoreCase && dictionary.isValidWord(lowerCasedWord))) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private int getMaxFrequency(final String word) {
+        if (TextUtils.isEmpty(word)) {
+            return Dictionary.NOT_A_PROBABILITY;
+        }
+        int maxFreq = -1;
+        for (final String key : mDictionaries.keySet()) {
+            final Dictionary dictionary = mDictionaries.get(key);
+            if (null == dictionary) continue;
+            final int tempFreq = dictionary.getFrequency(word);
+            if (tempFreq >= maxFreq) {
+                maxFreq = tempFreq;
+            }
+        }
+        return maxFreq;
+    }
+
+    private void removeDictionary(final String key) {
+        mDictionaries.remove(key);
+    }
+
+    private void addOrReplaceDictionary(final String key, final Dictionary dict) {
+        if (mDictionarySubsetForDebug != null && !mDictionarySubsetForDebug.contains(key)) {
+            Log.w(TAG, "Ignore add " + key + " dictionary for debug.");
+            return;
+        }
+        final Dictionary oldDict;
+        if (dict == null) {
+            oldDict = mDictionaries.remove(key);
+        } else {
+            oldDict = mDictionaries.put(key, dict);
+        }
+        if (oldDict != null && dict != oldDict) {
+            oldDict.close();
+        }
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/DictionaryFactory.java b/java/src/com/android/inputmethod/latin/DictionaryFactory.java
index 828e54f..e09c309 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryFactory.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryFactory.java
@@ -16,6 +16,7 @@
 
 package com.android.inputmethod.latin;
 
+import android.content.ContentProviderClient;
 import android.content.Context;
 import android.content.res.AssetFileDescriptor;
 import android.content.res.Resources;
@@ -64,6 +65,10 @@
                                 useFullEditDistance, locale, Dictionary.TYPE_MAIN);
                 if (readOnlyBinaryDictionary.isValidDictionary()) {
                     dictList.add(readOnlyBinaryDictionary);
+                } else {
+                    readOnlyBinaryDictionary.close();
+                    // Prevent this dictionary to do any further harm.
+                    killDictionary(context, f);
                 }
             }
         }
@@ -75,6 +80,51 @@
     }
 
     /**
+     * Kills a dictionary so that it is never used again, if possible.
+     * @param context The context to contact the dictionary provider, if possible.
+     * @param f A file address to the dictionary to kill.
+     */
+    private static void killDictionary(final Context context, final AssetFileAddress f) {
+        if (f.pointsToPhysicalFile()) {
+            f.deleteUnderlyingFile();
+            // Warn the dictionary provider if the dictionary came from there.
+            final ContentProviderClient providerClient;
+            try {
+                providerClient = context.getContentResolver().acquireContentProviderClient(
+                        BinaryDictionaryFileDumper.getProviderUriBuilder("").build());
+            } catch (final SecurityException e) {
+                Log.e(TAG, "No permission to communicate with the dictionary provider", e);
+                return;
+            }
+            if (null == providerClient) {
+                Log.e(TAG, "Can't establish communication with the dictionary provider");
+                return;
+            }
+            final String wordlistId =
+                    DictionaryInfoUtils.getWordListIdFromFileName(new File(f.mFilename).getName());
+            if (null != wordlistId) {
+                // TODO: this is a reasonable last resort, but it is suboptimal.
+                // The following will remove the entry for this dictionary with the dictionary
+                // provider. When the metadata is downloaded again, we will try downloading it
+                // again.
+                // However, in the practice that will mean the user will find themselves without
+                // the new dictionary. That's fine for languages where it's included in the APK,
+                // but for other languages it will leave the user without a dictionary at all until
+                // the next update, which may be a few days away.
+                // Ideally, we would trigger a new download right away, and use increasing retry
+                // delays for this particular id/version combination.
+                // Then again, this is expected to only ever happen in case of human mistake. If
+                // the wrong file is on the server, the following is still doing the right thing.
+                // If it's a file left over from the last version however, it's not great.
+                BinaryDictionaryFileDumper.reportBrokenFileToDictionaryProvider(
+                        providerClient,
+                        context.getString(R.string.dictionary_pack_client_id),
+                        wordlistId);
+            }
+        }
+    }
+
+    /**
      * Initializes a main dictionary collection from a dictionary pack, with default flags.
      *
      * This searches for a content provider providing a dictionary pack for the specified
diff --git a/java/src/com/android/inputmethod/latin/DictionaryWriter.java b/java/src/com/android/inputmethod/latin/DictionaryWriter.java
index 3df2a2b..89ef96d 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryWriter.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryWriter.java
@@ -18,8 +18,6 @@
 
 import android.content.Context;
 
-import com.android.inputmethod.keyboard.ProximityInfo;
-import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
 import com.android.inputmethod.latin.makedict.FusionDictionary;
@@ -37,14 +35,14 @@
  * An in memory dictionary for memorizing entries and writing a binary dictionary.
  */
 public class DictionaryWriter extends AbstractDictionaryWriter {
-    private static final int BINARY_DICT_VERSION = 3;
+    private static final int BINARY_DICT_VERSION = 2;
     private static final FormatSpec.FormatOptions FORMAT_OPTIONS =
-            new FormatSpec.FormatOptions(BINARY_DICT_VERSION, true /* supportsDynamicUpdate */);
+            new FormatSpec.FormatOptions(BINARY_DICT_VERSION, false /* supportsDynamicUpdate */);
 
     private FusionDictionary mFusionDictionary;
 
-    public DictionaryWriter(final Context context, final String dictType) {
-        super(context, dictType);
+    public DictionaryWriter(final Context context) {
+        super(context);
         clear();
     }
 
@@ -52,7 +50,7 @@
     public void clear() {
         final HashMap<String, String> attributes = CollectionUtils.newHashMap();
         mFusionDictionary = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(attributes, false, false));
+                new FusionDictionary.DictionaryOptions(attributes));
     }
 
     /**
@@ -92,18 +90,4 @@
         }
         dictEncoder.writeDictionary(mFusionDictionary, FORMAT_OPTIONS);
     }
-
-    @Override
-    public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
-            final String prevWord, final ProximityInfo proximityInfo,
-            boolean blockOffensiveWords, final int[] additionalFeaturesOptions) {
-        // This class doesn't support suggestion.
-        return null;
-    }
-
-    @Override
-    public boolean isValidWord(String word) {
-        // This class doesn't support dictionary retrieval.
-        return false;
-    }
 }
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index eb8650e..f785835 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -17,23 +17,26 @@
 package com.android.inputmethod.latin;
 
 import android.content.Context;
-import android.os.SystemClock;
 import android.util.Log;
 
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
+import com.android.inputmethod.latin.BinaryDictionary.LanguageModelParam;
 import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.personalization.DynamicPersonalizationDictionaryWriter;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.utils.AsyncResultHolder;
 import com.android.inputmethod.latin.utils.CollectionUtils;
+import com.android.inputmethod.latin.utils.FileUtils;
 import com.android.inputmethod.latin.utils.PrioritizedSerialExecutor;
 
 import java.io.File;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 
@@ -52,10 +55,7 @@
 
     /** Whether to print debug output to log */
     private static boolean DEBUG = false;
-
-    // TODO: Remove.
-    /** Whether to call binary dictionary dynamically updating methods. */
-    public static boolean ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE = true;
+    private static final boolean DBG_STRESS_TEST = false;
 
     private static final int TIMEOUT_FOR_READ_OPS_IN_MILLISECONDS = 100;
 
@@ -64,22 +64,19 @@
      */
     protected static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
 
-    private static final int DICTIONARY_FORMAT_VERSION = 3;
-
-    private static final String SUPPORTS_DYNAMIC_UPDATE =
-            FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE;
+    private static final int DICTIONARY_FORMAT_VERSION = FormatSpec.VERSION4;
 
     /**
      * A static map of update controllers, each of which records the time of accesses to a single
      * binary dictionary file and tracks whether the file is regenerating. The key for this map is
-     * the filename and the value is the shared dictionary time recorder associated with that
-     * filename.
+     * the dictionary name  and the value is the shared dictionary time recorder associated with
+     * that dictionary name.
      */
     private static final ConcurrentHashMap<String, DictionaryUpdateController>
-            sFilenameDictionaryUpdateControllerMap = CollectionUtils.newConcurrentHashMap();
+            sDictNameDictionaryUpdateControllerMap = CollectionUtils.newConcurrentHashMap();
 
     private static final ConcurrentHashMap<String, PrioritizedSerialExecutor>
-            sFilenameExecutorMap = CollectionUtils.newConcurrentHashMap();
+            sDictNameExecutorMap = CollectionUtils.newConcurrentHashMap();
 
     /** The application context. */
     protected final Context mContext;
@@ -95,18 +92,24 @@
     protected AbstractDictionaryWriter mDictionaryWriter;
 
     /**
-     * The name of this dictionary, used as the filename for storing the binary dictionary. Multiple
-     * dictionary instances with the same filename is supported, with access controlled by
-     * DictionaryTimeRecorder.
+     * The name of this dictionary, used as a part of the filename for storing the binary
+     * dictionary. Multiple dictionary instances with the same name is supported, with access
+     * controlled by DictionaryUpdateController.
      */
-    private final String mFilename;
+    private final String mDictName;
+
+    /** Dictionary locale */
+    private final Locale mLocale;
 
     /** Whether to support dynamically updating the dictionary */
     private final boolean mIsUpdatable;
 
+    /** Dictionary file */
+    private final File mDictFile;
+
     // TODO: remove, once dynamic operations is serialized
     /** Controls updating the shared binary dictionary file across multiple instances. */
-    private final DictionaryUpdateController mFilenameDictionaryUpdateController;
+    private final DictionaryUpdateController mDictNameDictionaryUpdateController;
 
     // TODO: remove, once dynamic operations is serialized
     /** Controls updating the local binary dictionary for this instance. */
@@ -132,45 +135,70 @@
      */
     protected abstract boolean hasContentChanged();
 
+    protected boolean matchesExpectedBinaryDictFormatVersionForThisType(final int formatVersion) {
+        // This class is using format 2 because it's used by the User and Contacts dictionary
+        // only, which right now use format 2 (dicts using format 4 use Decaying*, which overrides
+        // this method).
+        // TODO: Migrate these dicts to ver4 format, and remove this function.
+        return formatVersion == FormatSpec.VERSION2;
+    }
+
+    public boolean isValidDictionary() {
+        return mBinaryDictionary.isValidDictionary();
+    }
+
+    private File getDictFile() {
+        return mDictFile;
+    }
+
     /**
-     * Gets the dictionary update controller for the given filename.
+     * Gets the dictionary update controller for the given dictionary name.
      */
     private static DictionaryUpdateController getDictionaryUpdateController(
-            String filename) {
-        DictionaryUpdateController recorder = sFilenameDictionaryUpdateControllerMap.get(filename);
+            final String dictName) {
+        DictionaryUpdateController recorder = sDictNameDictionaryUpdateControllerMap.get(dictName);
         if (recorder == null) {
-            synchronized(sFilenameDictionaryUpdateControllerMap) {
+            synchronized(sDictNameDictionaryUpdateControllerMap) {
                 recorder = new DictionaryUpdateController();
-                sFilenameDictionaryUpdateControllerMap.put(filename, recorder);
+                sDictNameDictionaryUpdateControllerMap.put(dictName, recorder);
             }
         }
         return recorder;
     }
 
     /**
-     * Gets the executor for the given filename.
+     * Gets the executor for the given dictionary name.
      */
-    private static PrioritizedSerialExecutor getExecutor(final String filename) {
-        PrioritizedSerialExecutor executor = sFilenameExecutorMap.get(filename);
+    private static PrioritizedSerialExecutor getExecutor(final String dictName) {
+        PrioritizedSerialExecutor executor = sDictNameExecutorMap.get(dictName);
         if (executor == null) {
-            synchronized(sFilenameExecutorMap) {
+            synchronized(sDictNameExecutorMap) {
                 executor = new PrioritizedSerialExecutor();
-                sFilenameExecutorMap.put(filename, executor);
+                sDictNameExecutorMap.put(dictName, executor);
             }
         }
         return executor;
     }
 
-    private static AbstractDictionaryWriter getDictionaryWriter(final Context context,
-            final String dictType, final boolean isDynamicPersonalizationDictionary) {
-        if (isDynamicPersonalizationDictionary) {
-            if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                return null;
-            } else {
-                return new DynamicPersonalizationDictionaryWriter(context, dictType);
+    /**
+     * Shutdowns all executors and removes all executors from the executor map for testing.
+     */
+    @UsedForTesting
+    public static void shutdownAllExecutors() {
+        synchronized(sDictNameExecutorMap) {
+            for (final PrioritizedSerialExecutor executor : sDictNameExecutorMap.values()) {
+                executor.shutdown();
+                sDictNameExecutorMap.remove(executor);
             }
+        }
+    }
+
+    private static AbstractDictionaryWriter getDictionaryWriter(final Context context,
+            final boolean isDynamicPersonalizationDictionary) {
+        if (isDynamicPersonalizationDictionary) {
+             return null;
         } else {
-            return new DictionaryWriter(context, dictType);
+            return new DictionaryWriter(context);
         }
     }
 
@@ -178,26 +206,37 @@
      * Creates a new expandable binary dictionary.
      *
      * @param context The application context of the parent.
-     * @param filename The filename for this binary dictionary. Multiple dictionaries with the same
-     *        filename is supported.
+     * @param dictName The name of the dictionary. Multiple instances with the same
+     *        name is supported.
+     * @param locale the dictionary locale.
      * @param dictType the dictionary type, as a human-readable string
      * @param isUpdatable whether to support dynamically updating the dictionary. Please note that
      *        dynamic dictionary has negative effects on memory space and computation time.
      */
-    public ExpandableBinaryDictionary(final Context context, final String filename,
-            final String dictType, final boolean isUpdatable) {
-        super(dictType);
-        mFilename = filename;
-        mContext = context;
-        mIsUpdatable = isUpdatable;
-        mBinaryDictionary = null;
-        mFilenameDictionaryUpdateController = getDictionaryUpdateController(filename);
-        // Currently, only dynamic personalization dictionary is updatable.
-        mDictionaryWriter = getDictionaryWriter(context, dictType, isUpdatable);
+    public ExpandableBinaryDictionary(final Context context, final String dictName,
+            final Locale locale, final String dictType, final boolean isUpdatable) {
+        this(context, dictName, locale, dictType, isUpdatable,
+                new File(context.getFilesDir(), dictName + DICT_FILE_EXTENSION));
     }
 
-    protected static String getFilenameWithLocale(final String name, final String localeStr) {
-        return name + "." + localeStr + DICT_FILE_EXTENSION;
+    // Creates an instance that uses a given dictionary file.
+    public ExpandableBinaryDictionary(final Context context, final String dictName,
+            final Locale locale, final String dictType, final boolean isUpdatable,
+            final File dictFile) {
+        super(dictType);
+        mDictName = dictName;
+        mContext = context;
+        mLocale = locale;
+        mIsUpdatable = isUpdatable;
+        mDictFile = dictFile;
+        mBinaryDictionary = null;
+        mDictNameDictionaryUpdateController = getDictionaryUpdateController(dictName);
+        // Currently, only dynamic personalization dictionary is updatable.
+        mDictionaryWriter = getDictionaryWriter(context, isUpdatable);
+    }
+
+    protected static String getDictNameWithLocale(final String name, final Locale locale) {
+        return name + "." + locale.toString();
     }
 
     /**
@@ -205,23 +244,20 @@
      */
     @Override
     public void close() {
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
                 if (mBinaryDictionary!= null) {
                     mBinaryDictionary.close();
                     mBinaryDictionary = null;
                 }
-                if (mDictionaryWriter != null) {
-                    mDictionaryWriter.close();
-                }
             }
         });
     }
 
     protected void closeBinaryDictionary() {
         // Ensure that no other threads are accessing the local binary dictionary.
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
                 if (mBinaryDictionary != null) {
@@ -234,19 +270,23 @@
 
     protected Map<String, String> getHeaderAttributeMap() {
         HashMap<String, String> attributeMap = new HashMap<String, String>();
-        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
-                SUPPORTS_DYNAMIC_UPDATE);
-        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_ID_ATTRIBUTE, mFilename);
+        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_ID_ATTRIBUTE, mDictName);
+        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_LOCALE_ATTRIBUTE, mLocale.toString());
+        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_VERSION_ATTRIBUTE,
+                String.valueOf(TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())));
         return attributeMap;
     }
 
     protected void clear() {
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
-                if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE && mDictionaryWriter == null) {
+                if (mDictionaryWriter == null) {
                     mBinaryDictionary.close();
-                    final File file = new File(mContext.getFilesDir(), mFilename);
+                    final File file = getDictFile();
+                    if (file.exists() && !FileUtils.deleteRecursively(file)) {
+                        Log.e(TAG, "Can't remove a file: " + file.getName());
+                    }
                     BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
                             DICTIONARY_FORMAT_VERSION, getHeaderAttributeMap());
                     mBinaryDictionary = new BinaryDictionary(
@@ -286,8 +326,7 @@
      * Check whether GC is needed and run GC if required.
      */
     protected void runGCIfRequired(final boolean mindsBlockByGC) {
-        if (!ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) return;
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
                 runGCIfRequiredInternalLocked(mindsBlockByGC);
@@ -296,18 +335,17 @@
     }
 
     private void runGCIfRequiredInternalLocked(final boolean mindsBlockByGC) {
-        if (!ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) return;
         // Calls to needsToRunGC() need to be serialized.
         if (mBinaryDictionary.needsToRunGC(mindsBlockByGC)) {
-            if (setIsRegeneratingIfNotRegenerating()) {
+            if (setProcessingLargeTaskIfNot()) {
                 // Run GC after currently existing time sensitive operations.
-                getExecutor(mFilename).executePrioritized(new Runnable() {
+                getExecutor(mDictName).executePrioritized(new Runnable() {
                     @Override
                     public void run() {
                         try {
                             mBinaryDictionary.flushWithGC();
                         } finally {
-                            mFilenameDictionaryUpdateController.mIsRegenerating.set(false);
+                            mDictNameDictionaryUpdateController.mProcessingLargeTask.set(false);
                         }
                     }
                 });
@@ -318,23 +356,19 @@
     /**
      * Dynamically adds a word unigram to the dictionary. May overwrite an existing entry.
      */
-    protected void addWordDynamically(final String word, final String shortcutTarget,
-            final int frequency, final int shortcutFreq, final boolean isNotAWord) {
+    protected void addWordDynamically(final String word, final int frequency,
+            final String shortcutTarget, final int shortcutFreq, final boolean isNotAWord,
+            final boolean isBlacklisted, final int timestamp) {
         if (!mIsUpdatable) {
-            Log.w(TAG, "addWordDynamically is called for non-updatable dictionary: " + mFilename);
+            Log.w(TAG, "addWordDynamically is called for non-updatable dictionary: " + mDictName);
             return;
         }
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
-                if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                    runGCIfRequiredInternalLocked(true /* mindsBlockByGC */);
-                    mBinaryDictionary.addUnigramWord(word, frequency);
-                } else {
-                    // TODO: Remove.
-                    mDictionaryWriter.addUnigramWord(word, shortcutTarget, frequency, shortcutFreq,
-                            isNotAWord);
-                }
+                runGCIfRequiredInternalLocked(true /* mindsBlockByGC */);
+                mBinaryDictionary.addUnigramWord(word, frequency, shortcutTarget, shortcutFreq,
+                        isNotAWord, isBlacklisted, timestamp);
             }
         });
     }
@@ -343,23 +377,17 @@
      * Dynamically adds a word bigram in the dictionary. May overwrite an existing entry.
      */
     protected void addBigramDynamically(final String word0, final String word1,
-            final int frequency, final boolean isValid) {
+            final int frequency, final int timestamp) {
         if (!mIsUpdatable) {
             Log.w(TAG, "addBigramDynamically is called for non-updatable dictionary: "
-                    + mFilename);
+                    + mDictName);
             return;
         }
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
-                if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                    runGCIfRequiredInternalLocked(true /* mindsBlockByGC */);
-                    mBinaryDictionary.addBigramWords(word0, word1, frequency);
-                } else {
-                    // TODO: Remove.
-                    mDictionaryWriter.addBigramWords(word0, word1, frequency, isValid,
-                            0 /* lastTouchedTime */);
-                }
+                runGCIfRequiredInternalLocked(true /* mindsBlockByGC */);
+                mBinaryDictionary.addBigramWords(word0, word1, frequency, timestamp);
             }
         });
     }
@@ -370,18 +398,48 @@
     protected void removeBigramDynamically(final String word0, final String word1) {
         if (!mIsUpdatable) {
             Log.w(TAG, "removeBigramDynamically is called for non-updatable dictionary: "
-                    + mFilename);
+                    + mDictName);
             return;
         }
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
-                if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                    runGCIfRequiredInternalLocked(true /* mindsBlockByGC */);
-                    mBinaryDictionary.removeBigramWords(word0, word1);
-                } else {
-                    // TODO: Remove.
-                    mDictionaryWriter.removeBigramWords(word0, word1);
+                runGCIfRequiredInternalLocked(true /* mindsBlockByGC */);
+                mBinaryDictionary.removeBigramWords(word0, word1);
+            }
+        });
+    }
+
+    public interface AddMultipleDictionaryEntriesCallback {
+        public void onFinished();
+    }
+
+    /**
+     * Dynamically add multiple entries to the dictionary.
+     */
+    protected void addMultipleDictionaryEntriesDynamically(
+            final ArrayList<LanguageModelParam> languageModelParams,
+            final AddMultipleDictionaryEntriesCallback callback) {
+        if (!mIsUpdatable) {
+            Log.w(TAG, "addMultipleDictionaryEntriesDynamically is called for non-updatable " +
+                    "dictionary: " + mDictName);
+            return;
+        }
+        getExecutor(mDictName).execute(new Runnable() {
+            @Override
+            public void run() {
+                final boolean locked = setProcessingLargeTaskIfNot();
+                try {
+                    mBinaryDictionary.addMultipleDictionaryEntries(
+                            languageModelParams.toArray(
+                                    new LanguageModelParam[languageModelParams.size()]));
+                } finally {
+                    if (callback != null) {
+                        callback.onFinished();
+                    }
+                    if (locked) {
+                        mDictNameDictionaryUpdateController.mProcessingLargeTask.set(false);
+                    }
                 }
             }
         });
@@ -393,49 +451,23 @@
             final boolean blockOffensiveWords, final int[] additionalFeaturesOptions,
             final int sessionId) {
         reloadDictionaryIfRequired();
-        if (isRegenerating()) {
+        if (processingLargeTask()) {
             return null;
         }
-        final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
         final AsyncResultHolder<ArrayList<SuggestedWordInfo>> holder =
                 new AsyncResultHolder<ArrayList<SuggestedWordInfo>>();
-        getExecutor(mFilename).executePrioritized(new Runnable() {
+        getExecutor(mDictName).executePrioritized(new Runnable() {
             @Override
             public void run() {
-                if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                    if (mBinaryDictionary == null) {
-                        holder.set(null);
-                        return;
-                    }
-                    final ArrayList<SuggestedWordInfo> binarySuggestion =
-                            mBinaryDictionary.getSuggestionsWithSessionId(composer, prevWord,
-                                    proximityInfo, blockOffensiveWords, additionalFeaturesOptions,
-                                    sessionId);
-                    holder.set(binarySuggestion);
-                } else {
-                    final ArrayList<SuggestedWordInfo> inMemDictSuggestion =
-                            composer.isBatchMode() ? null :
-                                    mDictionaryWriter.getSuggestionsWithSessionId(composer,
-                                            prevWord, proximityInfo, blockOffensiveWords,
-                                            additionalFeaturesOptions, sessionId);
-                    // TODO: Remove checking mIsUpdatable and use native suggestion.
-                    if (mBinaryDictionary != null && !mIsUpdatable) {
-                        final ArrayList<SuggestedWordInfo> binarySuggestion =
-                                mBinaryDictionary.getSuggestionsWithSessionId(composer, prevWord,
-                                        proximityInfo, blockOffensiveWords,
-                                        additionalFeaturesOptions, sessionId);
-                        if (inMemDictSuggestion == null) {
-                            holder.set(binarySuggestion);
-                        } else if (binarySuggestion == null) {
-                            holder.set(inMemDictSuggestion);
-                        } else {
-                            binarySuggestion.addAll(inMemDictSuggestion);
-                            holder.set(binarySuggestion);
-                        }
-                    } else {
-                        holder.set(inMemDictSuggestion);
-                    }
+                if (mBinaryDictionary == null) {
+                    holder.set(null);
+                    return;
                 }
+                final ArrayList<SuggestedWordInfo> binarySuggestion =
+                        mBinaryDictionary.getSuggestionsWithSessionId(composer, prevWord,
+                                proximityInfo, blockOffensiveWords, additionalFeaturesOptions,
+                                sessionId);
+                holder.set(binarySuggestion);
             }
         });
         return holder.get(null, TIMEOUT_FOR_READ_OPS_IN_MILLISECONDS);
@@ -456,11 +488,11 @@
     }
 
     protected boolean isValidWordInner(final String word) {
-        if (isRegenerating()) {
+        if (processingLargeTask()) {
             return false;
         }
         final AsyncResultHolder<Boolean> holder = new AsyncResultHolder<Boolean>();
-        getExecutor(mFilename).executePrioritized(new Runnable() {
+        getExecutor(mDictName).executePrioritized(new Runnable() {
             @Override
             public void run() {
                 holder.set(isValidWordLocked(word));
@@ -484,7 +516,7 @@
      * dictionary exists, this method will generate one.
      */
     protected void loadDictionary() {
-        mPerInstanceDictionaryUpdateController.mLastUpdateRequestTime = SystemClock.uptimeMillis();
+        mPerInstanceDictionaryUpdateController.mLastUpdateRequestTime = System.currentTimeMillis();
         reloadDictionaryIfRequired();
     }
 
@@ -494,12 +526,22 @@
      */
     private void loadBinaryDictionary() {
         if (DEBUG) {
-            Log.d(TAG, "Loading binary dictionary: " + mFilename + " request="
-                    + mFilenameDictionaryUpdateController.mLastUpdateRequestTime + " update="
-                    + mFilenameDictionaryUpdateController.mLastUpdateTime);
+            Log.d(TAG, "Loading binary dictionary: " + mDictName + " request="
+                    + mDictNameDictionaryUpdateController.mLastUpdateRequestTime + " update="
+                    + mDictNameDictionaryUpdateController.mLastUpdateTime);
+        }
+        if (DBG_STRESS_TEST) {
+            // Test if this class does not cause problems when it takes long time to load binary
+            // dictionary.
+            try {
+                Log.w(TAG, "Start stress in loading: " + mDictName);
+                Thread.sleep(15000);
+                Log.w(TAG, "End stress in loading");
+            } catch (InterruptedException e) {
+            }
         }
 
-        final File file = new File(mContext.getFilesDir(), mFilename);
+        final File file = getDictFile();
         final String filename = file.getAbsolutePath();
         final long length = file.length();
 
@@ -511,7 +553,7 @@
         // swapping in the new one.
         // TODO: Ensure multi-thread assignment of mBinaryDictionary.
         final BinaryDictionary oldBinaryDictionary = mBinaryDictionary;
-        getExecutor(mFilename).executePrioritized(new Runnable() {
+        getExecutor(mDictName).executePrioritized(new Runnable() {
             @Override
             public void run() {
                 mBinaryDictionary = newBinaryDictionary;
@@ -533,29 +575,31 @@
      */
     private void writeBinaryDictionary() {
         if (DEBUG) {
-            Log.d(TAG, "Generating binary dictionary: " + mFilename + " request="
-                    + mFilenameDictionaryUpdateController.mLastUpdateRequestTime + " update="
-                    + mFilenameDictionaryUpdateController.mLastUpdateTime);
+            Log.d(TAG, "Generating binary dictionary: " + mDictName + " request="
+                    + mDictNameDictionaryUpdateController.mLastUpdateRequestTime + " update="
+                    + mDictNameDictionaryUpdateController.mLastUpdateTime);
         }
         if (needsToReloadBeforeWriting()) {
             mDictionaryWriter.clear();
             loadDictionaryAsync();
-            mDictionaryWriter.write(mFilename, getHeaderAttributeMap());
+            mDictionaryWriter.write(getDictFile(), getHeaderAttributeMap());
         } else {
-            if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                if (mBinaryDictionary == null || !mBinaryDictionary.isValidDictionary()) {
-                    final File file = new File(mContext.getFilesDir(), mFilename);
-                    BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
-                            DICTIONARY_FORMAT_VERSION, getHeaderAttributeMap());
-                } else {
-                    if (mBinaryDictionary.needsToRunGC(false /* mindsBlockByGC */)) {
-                        mBinaryDictionary.flushWithGC();
-                    } else {
-                        mBinaryDictionary.flush();
-                    }
+            if (mBinaryDictionary == null || !isValidDictionary()
+                    // TODO: remove the check below
+                    || !matchesExpectedBinaryDictFormatVersionForThisType(
+                            mBinaryDictionary.getFormatVersion())) {
+                final File file = getDictFile();
+                if (file.exists() && !FileUtils.deleteRecursively(file)) {
+                    Log.e(TAG, "Can't remove a file: " + file.getName());
                 }
+                BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
+                        DICTIONARY_FORMAT_VERSION, getHeaderAttributeMap());
             } else {
-                mDictionaryWriter.write(mFilename, getHeaderAttributeMap());
+                if (mBinaryDictionary.needsToRunGC(false /* mindsBlockByGC */)) {
+                    mBinaryDictionary.flushWithGC();
+                } else {
+                    mBinaryDictionary.flush();
+                }
             }
         }
     }
@@ -568,12 +612,12 @@
      *        the current binary dictionary from file.
      */
     protected void setRequiresReload(final boolean requiresRebuild) {
-        final long time = SystemClock.uptimeMillis();
+        final long time = System.currentTimeMillis();
         mPerInstanceDictionaryUpdateController.mLastUpdateRequestTime = time;
-        mFilenameDictionaryUpdateController.mLastUpdateRequestTime = time;
+        mDictNameDictionaryUpdateController.mLastUpdateRequestTime = time;
         if (DEBUG) {
-            Log.d(TAG, "Reload request: " + mFilename + ": request=" + time + " update="
-                    + mFilenameDictionaryUpdateController.mLastUpdateTime);
+            Log.d(TAG, "Reload request: " + mDictName + ": request=" + time + " update="
+                    + mDictNameDictionaryUpdateController.mLastUpdateTime);
         }
     }
 
@@ -582,7 +626,7 @@
      */
     public final void reloadDictionaryIfRequired() {
         if (!isReloadRequired()) return;
-        if (setIsRegeneratingIfNotRegenerating()) {
+        if (setProcessingLargeTaskIfNot()) {
             reloadDictionary();
         }
     }
@@ -594,13 +638,14 @@
         return mBinaryDictionary == null || mPerInstanceDictionaryUpdateController.isOutOfDate();
     }
 
-    private boolean isRegenerating() {
-        return mFilenameDictionaryUpdateController.mIsRegenerating.get();
+    private boolean processingLargeTask() {
+        return mDictNameDictionaryUpdateController.mProcessingLargeTask.get();
     }
 
-    // Returns whether the dictionary can be regenerated.
-    private boolean setIsRegeneratingIfNotRegenerating() {
-        return mFilenameDictionaryUpdateController.mIsRegenerating.compareAndSet(
+    // Returns whether the dictionary is being used for a large task. If true, we should not use
+    // this dictionary for latency sensitive operations.
+    private boolean setProcessingLargeTaskIfNot() {
+        return mDictNameDictionaryUpdateController.mProcessingLargeTask.compareAndSet(
                 false /* expect */ , true /* update */);
     }
 
@@ -611,13 +656,13 @@
     private final void reloadDictionary() {
         // Ensure that only one thread attempts to read or write to the shared binary dictionary
         // file at the same time.
-        getExecutor(mFilename).execute(new Runnable() {
+        getExecutor(mDictName).execute(new Runnable() {
             @Override
             public void run() {
                 try {
-                    final long time = SystemClock.uptimeMillis();
+                    final long time = System.currentTimeMillis();
                     final boolean dictionaryFileExists = dictionaryFileExists();
-                    if (mFilenameDictionaryUpdateController.isOutOfDate()
+                    if (mDictNameDictionaryUpdateController.isOutOfDate()
                             || !dictionaryFileExists) {
                         // If the shared dictionary file does not exist or is out of date, the
                         // first instance that acquires the lock will generate a new one.
@@ -626,31 +671,44 @@
                             // rebuild the binary dictionary. Empty dictionaries are supported (in
                             // the case where loadDictionaryAsync() adds nothing) in order to
                             // provide a uniform framework.
-                            mFilenameDictionaryUpdateController.mLastUpdateTime = time;
+                            mDictNameDictionaryUpdateController.mLastUpdateTime = time;
                             writeBinaryDictionary();
                             loadBinaryDictionary();
                         } else {
                             // If not, the reload request was unnecessary so revert
                             // LastUpdateRequestTime to LastUpdateTime.
-                            mFilenameDictionaryUpdateController.mLastUpdateRequestTime =
-                                    mFilenameDictionaryUpdateController.mLastUpdateTime;
+                            mDictNameDictionaryUpdateController.mLastUpdateRequestTime =
+                                    mDictNameDictionaryUpdateController.mLastUpdateTime;
                         }
                     } else if (mBinaryDictionary == null ||
                             mPerInstanceDictionaryUpdateController.mLastUpdateTime
-                                    < mFilenameDictionaryUpdateController.mLastUpdateTime) {
+                                    < mDictNameDictionaryUpdateController.mLastUpdateTime) {
                         // Otherwise, if the local dictionary is older than the shared dictionary,
                         // load the shared dictionary.
                         loadBinaryDictionary();
                     }
-                    if (mBinaryDictionary != null && !mBinaryDictionary.isValidDictionary()) {
-                        // Binary dictionary is not valid. Regenerate the dictionary file.
-                        mFilenameDictionaryUpdateController.mLastUpdateTime = time;
-                        writeBinaryDictionary();
-                        loadBinaryDictionary();
-                    }
-                    mPerInstanceDictionaryUpdateController.mLastUpdateTime = time;
+                    // If we just loaded the binary dictionary, then mBinaryDictionary is not
+                    // up-to-date yet so it's useless to test it right away. Schedule the check
+                    // for right after it's loaded instead.
+                    getExecutor(mDictName).executePrioritized(new Runnable() {
+                        @Override
+                        public void run() {
+                            if (mBinaryDictionary != null && !(isValidDictionary()
+                                    // TODO: remove the check below
+                                    && matchesExpectedBinaryDictFormatVersionForThisType(
+                                            mBinaryDictionary.getFormatVersion()))) {
+                                // Binary dictionary or its format version is not valid. Regenerate
+                                // the dictionary file. writeBinaryDictionary will remove the
+                                // existing files if appropriate.
+                                mDictNameDictionaryUpdateController.mLastUpdateTime = time;
+                                writeBinaryDictionary();
+                                loadBinaryDictionary();
+                            }
+                            mPerInstanceDictionaryUpdateController.mLastUpdateTime = time;
+                        }
+                    });
                 } finally {
-                    mFilenameDictionaryUpdateController.mIsRegenerating.set(false);
+                    mDictNameDictionaryUpdateController.mProcessingLargeTask.set(false);
                 }
             }
         });
@@ -658,28 +716,13 @@
 
     // TODO: cache the file's existence so that we avoid doing a disk access each time.
     private boolean dictionaryFileExists() {
-        final File file = new File(mContext.getFilesDir(), mFilename);
-        return file.exists();
-    }
-
-    /**
-     * Load the dictionary to memory.
-     */
-    protected void asyncLoadDictionaryToMemory() {
-        getExecutor(mFilename).executePrioritized(new Runnable() {
-            @Override
-            public void run() {
-                if (!ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                    loadDictionaryAsync();
-                }
-            }
-        });
+        return getDictFile().exists();
     }
 
     /**
      * Generate binary dictionary using DictionaryWriter.
      */
-    protected void asyncFlashAllBinaryDictionary() {
+    protected void asyncFlushBinaryDictionary() {
         final Runnable newTask = new Runnable() {
             @Override
             public void run() {
@@ -687,37 +730,32 @@
             }
         };
         final Runnable oldTask = mUnfinishedFlushingTask.getAndSet(newTask);
-        getExecutor(mFilename).replaceAndExecute(oldTask, newTask);
+        getExecutor(mDictName).replaceAndExecute(oldTask, newTask);
     }
 
     /**
-     * For tracking whether the dictionary is out of date and the dictionary is regenerating.
-     * Can be shared across multiple dictionary instances that access the same filename.
+     * For tracking whether the dictionary is out of date and the dictionary is used in a large
+     * task. Can be shared across multiple dictionary instances that access the same filename.
      */
     private static class DictionaryUpdateController {
         public volatile long mLastUpdateTime = 0;
         public volatile long mLastUpdateRequestTime = 0;
-        public volatile AtomicBoolean mIsRegenerating = new AtomicBoolean();
+        public volatile AtomicBoolean mProcessingLargeTask = new AtomicBoolean();
 
         public boolean isOutOfDate() {
             return (mLastUpdateRequestTime > mLastUpdateTime);
         }
     }
 
-    // TODO: Implement native binary methods once the dynamic dictionary implementation is done.
+    // TODO: Implement BinaryDictionary.isInDictionary().
     @UsedForTesting
     public boolean isInDictionaryForTests(final String word) {
         final AsyncResultHolder<Boolean> holder = new AsyncResultHolder<Boolean>();
-        getExecutor(mFilename).executePrioritized(new Runnable() {
+        getExecutor(mDictName).executePrioritized(new Runnable() {
             @Override
             public void run() {
                 if (mDictType == Dictionary.TYPE_USER_HISTORY) {
-                    if (ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-                        holder.set(mBinaryDictionary.isValidWord(word));
-                    } else {
-                        holder.set(((DynamicPersonalizationDictionaryWriter) mDictionaryWriter)
-                                .isInBigramListForTests(word));
-                    }
+                    holder.set(mBinaryDictionary.isValidWord(word));
                 }
             }
         });
@@ -725,12 +763,33 @@
     }
 
     @UsedForTesting
-    public void shutdownExecutorForTests() {
-        getExecutor(mFilename).shutdown();
+    public void waitAllTasksForTests() {
+        final CountDownLatch countDownLatch = new CountDownLatch(1);
+        getExecutor(mDictName).execute(new Runnable() {
+            @Override
+            public void run() {
+                countDownLatch.countDown();
+            }
+        });
+        try {
+            countDownLatch.await();
+        } catch (InterruptedException e) {
+            Log.e(TAG, "Interrupted while waiting for finishing dictionary operations.", e);
+        }
     }
 
     @UsedForTesting
-    public boolean isTerminatedForTests() {
-        return getExecutor(mFilename).isTerminated();
+    protected void runAfterGcForDebug(final Runnable r) {
+        getExecutor(mDictName).executePrioritized(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    mBinaryDictionary.flushWithGC();
+                    r.run();
+                } finally {
+                    mDictNameDictionaryUpdateController.mProcessingLargeTask.set(false);
+                }
+            }
+        });
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
deleted file mode 100644
index 95c9bca..0000000
--- a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
+++ /dev/null
@@ -1,894 +0,0 @@
-/*
- * Copyright (C) 2009 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin;
-
-import android.text.TextUtils;
-import android.util.Log;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.keyboard.ProximityInfo;
-import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
-import com.android.inputmethod.latin.utils.CollectionUtils;
-import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils.ForgettingCurveParams;
-
-import java.util.ArrayList;
-import java.util.LinkedList;
-
-/**
- * Class for an in-memory dictionary that can grow dynamically and can
- * be searched for suggestions and valid words.
- */
-// TODO: Remove after binary dictionary supports dynamic update.
-public class ExpandableDictionary extends Dictionary {
-    private static final String TAG = ExpandableDictionary.class.getSimpleName();
-    /**
-     * The weight to give to a word if it's length is the same as the number of typed characters.
-     */
-    private static final int FULL_WORD_SCORE_MULTIPLIER = 2;
-
-    private char[] mWordBuilder = new char[Constants.DICTIONARY_MAX_WORD_LENGTH];
-    private int mMaxDepth;
-    private int mInputLength;
-
-    private static final class Node {
-        char mCode;
-        int mFrequency;
-        boolean mTerminal;
-        Node mParent;
-        NodeArray mChildren;
-        ArrayList<char[]> mShortcutTargets;
-        boolean mShortcutOnly;
-        LinkedList<NextWord> mNGrams; // Supports ngram
-    }
-
-    private static final class NodeArray {
-        Node[] mData;
-        int mLength = 0;
-        private static final int INCREMENT = 2;
-
-        NodeArray() {
-            mData = new Node[INCREMENT];
-        }
-
-        void add(final Node n) {
-            if (mLength + 1 > mData.length) {
-                Node[] tempData = new Node[mLength + INCREMENT];
-                if (mLength > 0) {
-                    System.arraycopy(mData, 0, tempData, 0, mLength);
-                }
-                mData = tempData;
-            }
-            mData[mLength++] = n;
-        }
-    }
-
-    public interface NextWord {
-        public Node getWordNode();
-        public int getFrequency();
-        public ForgettingCurveParams getFcParams();
-        public int notifyTypedAgainAndGetFrequency();
-    }
-
-    private static final class NextStaticWord implements NextWord {
-        public final Node mWord;
-        private final int mFrequency;
-        public NextStaticWord(Node word, int frequency) {
-            mWord = word;
-            mFrequency = frequency;
-        }
-
-        @Override
-        public Node getWordNode() {
-            return mWord;
-        }
-
-        @Override
-        public int getFrequency() {
-            return mFrequency;
-        }
-
-        @Override
-        public ForgettingCurveParams getFcParams() {
-            return null;
-        }
-
-        @Override
-        public int notifyTypedAgainAndGetFrequency() {
-            return mFrequency;
-        }
-    }
-
-    private static final class NextHistoryWord implements NextWord {
-        public final Node mWord;
-        public final ForgettingCurveParams mFcp;
-
-        public NextHistoryWord(Node word, ForgettingCurveParams fcp) {
-            mWord = word;
-            mFcp = fcp;
-        }
-
-        @Override
-        public Node getWordNode() {
-            return mWord;
-        }
-
-        @Override
-        public int getFrequency() {
-            return mFcp.getFrequency();
-        }
-
-        @Override
-        public ForgettingCurveParams getFcParams() {
-            return mFcp;
-        }
-
-        @Override
-        public int notifyTypedAgainAndGetFrequency() {
-            return mFcp.notifyTypedAgainAndGetFrequency();
-        }
-    }
-
-    private NodeArray mRoots;
-
-    private int[][] mCodes;
-
-    public ExpandableDictionary(final String dictType) {
-        super(dictType);
-        clearDictionary();
-        mCodes = new int[Constants.DICTIONARY_MAX_WORD_LENGTH][];
-    }
-
-    public int getMaxWordLength() {
-        return Constants.DICTIONARY_MAX_WORD_LENGTH;
-    }
-
-    /**
-     * Add a word with an optional shortcut to the dictionary.
-     * @param word The word to add.
-     * @param shortcutTarget A shortcut target for this word, or null if none.
-     * @param frequency The frequency for this unigram.
-     * @param shortcutFreq The frequency of the shortcut (0~15, with 15 = whitelist). Ignored
-     *   if shortcutTarget is null.
-     */
-    public void addWord(final String word, final String shortcutTarget, final int frequency,
-            final int shortcutFreq) {
-        if (word.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH) {
-            return;
-        }
-        addWordRec(mRoots, word, 0, shortcutTarget, frequency, shortcutFreq, null);
-    }
-
-    /**
-     * Add a word, recursively searching for its correct place in the trie tree.
-     * @param children The node to recursively search for addition. Initially, the root of the tree.
-     * @param word The word to add.
-     * @param depth The current depth in the tree.
-     * @param shortcutTarget A shortcut target for this word, or null if none.
-     * @param frequency The frequency for this unigram.
-     * @param shortcutFreq The frequency of the shortcut (0~15, with 15 = whitelist). Ignored
-     *   if shortcutTarget is null.
-     * @param parentNode The parent node, for up linking. Initially null, as the root has no parent.
-     */
-    private void addWordRec(final NodeArray children, final String word, final int depth,
-            final String shortcutTarget, final int frequency, final int shortcutFreq,
-            final Node parentNode) {
-        final int wordLength = word.length();
-        if (wordLength <= depth) return;
-        final char c = word.charAt(depth);
-        // Does children have the current character?
-        final int childrenLength = children.mLength;
-        Node childNode = null;
-        for (int i = 0; i < childrenLength; i++) {
-            final Node node = children.mData[i];
-            if (node.mCode == c) {
-                childNode = node;
-                break;
-            }
-        }
-        final boolean isShortcutOnly = (null != shortcutTarget);
-        if (childNode == null) {
-            childNode = new Node();
-            childNode.mCode = c;
-            childNode.mParent = parentNode;
-            childNode.mShortcutOnly = isShortcutOnly;
-            children.add(childNode);
-        }
-        if (wordLength == depth + 1) {
-            // Terminate this word
-            childNode.mTerminal = true;
-            if (isShortcutOnly) {
-                if (null == childNode.mShortcutTargets) {
-                    childNode.mShortcutTargets = CollectionUtils.newArrayList();
-                }
-                childNode.mShortcutTargets.add(shortcutTarget.toCharArray());
-            } else {
-                childNode.mShortcutOnly = false;
-            }
-            childNode.mFrequency = Math.max(frequency, childNode.mFrequency);
-            if (childNode.mFrequency > 255) childNode.mFrequency = 255;
-            return;
-        }
-        if (childNode.mChildren == null) {
-            childNode.mChildren = new NodeArray();
-        }
-        addWordRec(childNode.mChildren, word, depth + 1, shortcutTarget, frequency, shortcutFreq,
-                childNode);
-    }
-
-    @Override
-    public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
-            final String prevWord, final ProximityInfo proximityInfo,
-            final boolean blockOffensiveWords, final int[] additionalFeaturesOptions) {
-        if (composer.size() > 1) {
-            if (composer.size() >= Constants.DICTIONARY_MAX_WORD_LENGTH) {
-                return null;
-            }
-            final ArrayList<SuggestedWordInfo> suggestions =
-                    getWordsInner(composer, prevWord, proximityInfo);
-            return suggestions;
-        } else {
-            if (TextUtils.isEmpty(prevWord)) return null;
-            final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
-            runBigramReverseLookUp(prevWord, suggestions);
-            return suggestions;
-        }
-    }
-
-    private ArrayList<SuggestedWordInfo> getWordsInner(final WordComposer codes,
-            final String prevWordForBigrams, final ProximityInfo proximityInfo) {
-        final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
-        mInputLength = codes.size();
-        if (mCodes.length < mInputLength) mCodes = new int[mInputLength][];
-        final InputPointers ips = codes.getInputPointers();
-        final int[] xCoordinates = ips.getXCoordinates();
-        final int[] yCoordinates = ips.getYCoordinates();
-        // Cache the codes so that we don't have to lookup an array list
-        for (int i = 0; i < mInputLength; i++) {
-            // TODO: Calculate proximity info here.
-            if (mCodes[i] == null || mCodes[i].length < 1) {
-                mCodes[i] = new int[ProximityInfo.MAX_PROXIMITY_CHARS_SIZE];
-            }
-            final int x = xCoordinates != null && i < xCoordinates.length ?
-                    xCoordinates[i] : Constants.NOT_A_COORDINATE;
-            final int y = xCoordinates != null && i < yCoordinates.length ?
-                    yCoordinates[i] : Constants.NOT_A_COORDINATE;
-            proximityInfo.fillArrayWithNearestKeyCodes(x, y, codes.getCodeAt(i), mCodes[i]);
-        }
-        mMaxDepth = mInputLength * 3;
-        getWordsRec(mRoots, codes, mWordBuilder, 0, false, 1, 0, -1, suggestions);
-        for (int i = 0; i < mInputLength; i++) {
-            getWordsRec(mRoots, codes, mWordBuilder, 0, false, 1, 0, i, suggestions);
-        }
-        return suggestions;
-    }
-
-    @Override
-    public synchronized boolean isValidWord(final String word) {
-        final Node node = searchNode(mRoots, word, 0, word.length());
-        // If node is null, we didn't find the word, so it's not valid.
-        // If node.mShortcutOnly is true, then it exists as a shortcut but not as a word,
-        // so that means it's not a valid word.
-        // If node.mShortcutOnly is false, then it exists as a word (it may also exist as
-        // a shortcut, but this does not matter), so it's a valid word.
-        return (node == null) ? false : !node.mShortcutOnly;
-    }
-
-    public boolean removeBigram(final String word0, final String word1) {
-        // Refer to addOrSetBigram() about word1.toLowerCase()
-        final Node firstWord = searchWord(mRoots, word0.toLowerCase(), 0, null);
-        final Node secondWord = searchWord(mRoots, word1, 0, null);
-        LinkedList<NextWord> bigrams = firstWord.mNGrams;
-        NextWord bigramNode = null;
-        if (bigrams == null || bigrams.size() == 0) {
-            return false;
-        } else {
-            for (NextWord nw : bigrams) {
-                if (nw.getWordNode() == secondWord) {
-                    bigramNode = nw;
-                    break;
-                }
-            }
-        }
-        if (bigramNode == null) {
-            return false;
-        }
-        return bigrams.remove(bigramNode);
-    }
-
-    /**
-     * Returns the word's frequency or -1 if not found
-     */
-    @UsedForTesting
-    public int getWordFrequency(final String word) {
-        // Case-sensitive search
-        final Node node = searchNode(mRoots, word, 0, word.length());
-        return (node == null) ? -1 : node.mFrequency;
-    }
-
-    public NextWord getBigramWord(final String word0, final String word1) {
-        // Refer to addOrSetBigram() about word0.toLowerCase()
-        final Node firstWord = searchWord(mRoots, word0.toLowerCase(), 0, null);
-        final Node secondWord = searchWord(mRoots, word1, 0, null);
-        LinkedList<NextWord> bigrams = firstWord.mNGrams;
-        if (bigrams == null || bigrams.size() == 0) {
-            return null;
-        } else {
-            for (NextWord nw : bigrams) {
-                if (nw.getWordNode() == secondWord) {
-                    return nw;
-                }
-            }
-        }
-        return null;
-    }
-
-    private static int computeSkippedWordFinalFreq(final int freq, final int snr,
-            final int inputLength) {
-        // The computation itself makes sense for >= 2, but the == 2 case returns 0
-        // anyway so we may as well test against 3 instead and return the constant
-        if (inputLength >= 3) {
-            return (freq * snr * (inputLength - 2)) / (inputLength - 1);
-        } else {
-            return 0;
-        }
-    }
-
-    /**
-     * Helper method to add a word and its shortcuts.
-     *
-     * @param node the terminal node
-     * @param word the word to insert, as an array of code points
-     * @param depth the depth of the node in the tree
-     * @param finalFreq the frequency for this word
-     * @param suggestions the suggestion collection to add the suggestions to
-     * @return whether there is still space for more words.
-     */
-    private boolean addWordAndShortcutsFromNode(final Node node, final char[] word, final int depth,
-            final int finalFreq, final ArrayList<SuggestedWordInfo> suggestions) {
-        if (finalFreq > 0 && !node.mShortcutOnly) {
-            // Use KIND_CORRECTION always. This dictionary does not really have a notion of
-            // COMPLETION against CORRECTION; we could artificially add one by looking at
-            // the respective size of the typed word and the suggestion if it matters sometime
-            // in the future.
-            suggestions.add(new SuggestedWordInfo(new String(word, 0, depth + 1), finalFreq,
-                    SuggestedWordInfo.KIND_CORRECTION, this /* sourceDict */,
-                    SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */,
-                    SuggestedWordInfo.NOT_A_CONFIDENCE /* autoCommitFirstWordConfidence */));
-            if (suggestions.size() >= Suggest.MAX_SUGGESTIONS) return false;
-        }
-        if (null != node.mShortcutTargets) {
-            final int length = node.mShortcutTargets.size();
-            for (int shortcutIndex = 0; shortcutIndex < length; ++shortcutIndex) {
-                final char[] shortcut = node.mShortcutTargets.get(shortcutIndex);
-                suggestions.add(new SuggestedWordInfo(new String(shortcut, 0, shortcut.length),
-                        finalFreq, SuggestedWordInfo.KIND_SHORTCUT, this /* sourceDict */,
-                        SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */,
-                        SuggestedWordInfo.NOT_A_CONFIDENCE /* autoCommitFirstWordConfidence */));
-                if (suggestions.size() > Suggest.MAX_SUGGESTIONS) return false;
-            }
-        }
-        return true;
-    }
-
-    /**
-     * Recursively traverse the tree for words that match the input. Input consists of
-     * a list of arrays. Each item in the list is one input character position. An input
-     * character is actually an array of multiple possible candidates. This function is not
-     * optimized for speed, assuming that the user dictionary will only be a few hundred words in
-     * size.
-     * @param roots node whose children have to be search for matches
-     * @param codes the input character codes
-     * @param word the word being composed as a possible match
-     * @param depth the depth of traversal - the length of the word being composed thus far
-     * @param completion whether the traversal is now in completion mode - meaning that we've
-     * exhausted the input and we're looking for all possible suffixes.
-     * @param snr current weight of the word being formed
-     * @param inputIndex position in the input characters. This can be off from the depth in
-     * case we skip over some punctuations such as apostrophe in the traversal. That is, if you type
-     * "wouldve", it could be matching "would've", so the depth will be one more than the
-     * inputIndex
-     * @param suggestions the list in which to add suggestions
-     */
-    // TODO: Share this routine with the native code for BinaryDictionary
-    private void getWordsRec(final NodeArray roots, final WordComposer codes, final char[] word,
-            final int depth, final boolean completion, final int snr, final int inputIndex,
-            final int skipPos, final ArrayList<SuggestedWordInfo> suggestions) {
-        final int count = roots.mLength;
-        final int codeSize = mInputLength;
-        // Optimization: Prune out words that are too long compared to how much was typed.
-        if (depth > mMaxDepth) {
-            return;
-        }
-        final int[] currentChars;
-        if (codeSize <= inputIndex) {
-            currentChars = null;
-        } else {
-            currentChars = mCodes[inputIndex];
-        }
-
-        for (int i = 0; i < count; i++) {
-            final Node node = roots.mData[i];
-            final char c = node.mCode;
-            final char lowerC = toLowerCase(c);
-            final boolean terminal = node.mTerminal;
-            final NodeArray children = node.mChildren;
-            final int freq = node.mFrequency;
-            if (completion || currentChars == null) {
-                word[depth] = c;
-                if (terminal) {
-                    final int finalFreq;
-                    if (skipPos < 0) {
-                        finalFreq = freq * snr;
-                    } else {
-                        finalFreq = computeSkippedWordFinalFreq(freq, snr, mInputLength);
-                    }
-                    if (!addWordAndShortcutsFromNode(node, word, depth, finalFreq, suggestions)) {
-                        // No space left in the queue, bail out
-                        return;
-                    }
-                }
-                if (children != null) {
-                    getWordsRec(children, codes, word, depth + 1, true, snr, inputIndex,
-                            skipPos, suggestions);
-                }
-            } else if ((c == Constants.CODE_SINGLE_QUOTE
-                    && currentChars[0] != Constants.CODE_SINGLE_QUOTE) || depth == skipPos) {
-                // Skip the ' and continue deeper
-                word[depth] = c;
-                if (children != null) {
-                    getWordsRec(children, codes, word, depth + 1, completion, snr, inputIndex,
-                            skipPos, suggestions);
-                }
-            } else {
-                // Don't use alternatives if we're looking for missing characters
-                final int alternativesSize = skipPos >= 0 ? 1 : currentChars.length;
-                for (int j = 0; j < alternativesSize; j++) {
-                    final int addedAttenuation = (j > 0 ? 1 : 2);
-                    final int currentChar = currentChars[j];
-                    if (currentChar == Constants.NOT_A_CODE) {
-                        break;
-                    }
-                    if (currentChar == lowerC || currentChar == c) {
-                        word[depth] = c;
-
-                        if (codeSize == inputIndex + 1) {
-                            if (terminal) {
-                                final int finalFreq;
-                                if (skipPos < 0) {
-                                    finalFreq = freq * snr * addedAttenuation
-                                            * FULL_WORD_SCORE_MULTIPLIER;
-                                } else {
-                                    finalFreq = computeSkippedWordFinalFreq(freq,
-                                            snr * addedAttenuation, mInputLength);
-                                }
-                                if (!addWordAndShortcutsFromNode(node, word, depth, finalFreq,
-                                        suggestions)) {
-                                    // No space left in the queue, bail out
-                                    return;
-                                }
-                            }
-                            if (children != null) {
-                                getWordsRec(children, codes, word, depth + 1,
-                                        true, snr * addedAttenuation, inputIndex + 1,
-                                        skipPos, suggestions);
-                            }
-                        } else if (children != null) {
-                            getWordsRec(children, codes, word, depth + 1,
-                                    false, snr * addedAttenuation, inputIndex + 1,
-                                    skipPos, suggestions);
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    public int setBigramAndGetFrequency(final String word0, final String word1,
-            final int frequency) {
-        return setBigramAndGetFrequency(word0, word1, frequency, null /* unused */);
-    }
-
-    public int setBigramAndGetFrequency(final String word0, final String word1,
-            final ForgettingCurveParams fcp) {
-        return setBigramAndGetFrequency(word0, word1, 0 /* unused */, fcp);
-    }
-
-    /**
-     * Adds bigrams to the in-memory trie structure that is being used to retrieve any word
-     * @param word0 the first word of this bigram
-     * @param word1 the second word of this bigram
-     * @param frequency frequency for this bigram
-     * @param fcp an instance of ForgettingCurveParams to use for decay policy
-     * @return returns the final bigram frequency
-     */
-    private int setBigramAndGetFrequency(final String word0, final String word1,
-            final int frequency, final ForgettingCurveParams fcp) {
-        if (TextUtils.isEmpty(word0)) {
-            Log.e(TAG, "Invalid bigram previous word: " + word0);
-            return frequency;
-        }
-        // We don't want results to be different according to case of the looked up left hand side
-        // word. We do want however to return the correct case for the right hand side.
-        // So we want to squash the case of the left hand side, and preserve that of the right
-        // hand side word.
-        final String word0Lower = word0.toLowerCase();
-        if (TextUtils.isEmpty(word0Lower) || TextUtils.isEmpty(word1)) {
-            Log.e(TAG, "Invalid bigram pair: " + word0 + ", " + word0Lower + ", " + word1);
-            return frequency;
-        }
-        final Node firstWord = searchWord(mRoots, word0Lower, 0, null);
-        final Node secondWord = searchWord(mRoots, word1, 0, null);
-        LinkedList<NextWord> bigrams = firstWord.mNGrams;
-        if (bigrams == null || bigrams.size() == 0) {
-            firstWord.mNGrams = CollectionUtils.newLinkedList();
-            bigrams = firstWord.mNGrams;
-        } else {
-            for (NextWord nw : bigrams) {
-                if (nw.getWordNode() == secondWord) {
-                    return nw.notifyTypedAgainAndGetFrequency();
-                }
-            }
-        }
-        if (fcp != null) {
-            // history
-            firstWord.mNGrams.add(new NextHistoryWord(secondWord, fcp));
-        } else {
-            firstWord.mNGrams.add(new NextStaticWord(secondWord, frequency));
-        }
-        return frequency;
-    }
-
-    /**
-     * Searches for the word and add the word if it does not exist.
-     * @return Returns the terminal node of the word we are searching for.
-     */
-    private Node searchWord(final NodeArray children, final String word, final int depth,
-            final Node parentNode) {
-        final int wordLength = word.length();
-        final char c = word.charAt(depth);
-        // Does children have the current character?
-        final int childrenLength = children.mLength;
-        Node childNode = null;
-        for (int i = 0; i < childrenLength; i++) {
-            final Node node = children.mData[i];
-            if (node.mCode == c) {
-                childNode = node;
-                break;
-            }
-        }
-        if (childNode == null) {
-            childNode = new Node();
-            childNode.mCode = c;
-            childNode.mParent = parentNode;
-            children.add(childNode);
-        }
-        if (wordLength == depth + 1) {
-            // Terminate this word
-            childNode.mTerminal = true;
-            return childNode;
-        }
-        if (childNode.mChildren == null) {
-            childNode.mChildren = new NodeArray();
-        }
-        return searchWord(childNode.mChildren, word, depth + 1, childNode);
-    }
-
-    private void runBigramReverseLookUp(final String previousWord,
-            final ArrayList<SuggestedWordInfo> suggestions) {
-        // Search for the lowercase version of the word only, because that's where bigrams
-        // store their sons.
-        final Node prevWord = searchNode(mRoots, previousWord.toLowerCase(), 0,
-                previousWord.length());
-        if (prevWord != null && prevWord.mNGrams != null) {
-            reverseLookUp(prevWord.mNGrams, suggestions);
-        }
-    }
-
-    // Local to reverseLookUp, but do not allocate each time.
-    private final char[] mLookedUpString = new char[Constants.DICTIONARY_MAX_WORD_LENGTH];
-
-    /**
-     * reverseLookUp retrieves the full word given a list of terminal nodes and adds those words
-     * to the suggestions list passed as an argument.
-     * @param terminalNodes list of terminal nodes we want to add
-     * @param suggestions the suggestion collection to add the word to
-     */
-    private void reverseLookUp(final LinkedList<NextWord> terminalNodes,
-            final ArrayList<SuggestedWordInfo> suggestions) {
-        Node node;
-        int freq;
-        for (NextWord nextWord : terminalNodes) {
-            node = nextWord.getWordNode();
-            freq = nextWord.getFrequency();
-            int index = Constants.DICTIONARY_MAX_WORD_LENGTH;
-            do {
-                --index;
-                mLookedUpString[index] = node.mCode;
-                node = node.mParent;
-            } while (node != null && index > 0);
-
-            // If node is null, we have a word longer than MAX_WORD_LENGTH in the dictionary.
-            // It's a little unclear how this can happen, but just in case it does it's safer
-            // to ignore the word in this case.
-            if (freq >= 0 && node == null) {
-                suggestions.add(new SuggestedWordInfo(new String(mLookedUpString, index,
-                        Constants.DICTIONARY_MAX_WORD_LENGTH - index),
-                        freq, SuggestedWordInfo.KIND_CORRECTION, this /* sourceDict */,
-                        SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */,
-                        SuggestedWordInfo.NOT_A_CONFIDENCE /* autoCommitFirstWordConfidence */));
-            }
-        }
-    }
-
-    /**
-     * Recursively search for the terminal node of the word.
-     *
-     * One iteration takes the full word to search for and the current index of the recursion.
-     *
-     * @param children the node of the trie to search under.
-     * @param word the word to search for. Only read [offset..length] so there may be trailing chars
-     * @param offset the index in {@code word} this recursion should operate on.
-     * @param length the length of the input word.
-     * @return Returns the terminal node of the word if the word exists
-     */
-    private Node searchNode(final NodeArray children, final CharSequence word, final int offset,
-            final int length) {
-        final int count = children.mLength;
-        final char currentChar = word.charAt(offset);
-        for (int j = 0; j < count; j++) {
-            final Node node = children.mData[j];
-            if (node.mCode == currentChar) {
-                if (offset == length - 1) {
-                    if (node.mTerminal) {
-                        return node;
-                    }
-                } else {
-                    if (node.mChildren != null) {
-                        Node returnNode = searchNode(node.mChildren, word, offset + 1, length);
-                        if (returnNode != null) return returnNode;
-                    }
-                }
-            }
-        }
-        return null;
-    }
-
-    public void clearDictionary() {
-        mRoots = new NodeArray();
-    }
-
-    private static char toLowerCase(final char c) {
-        char baseChar = c;
-        if (c < BASE_CHARS.length) {
-            baseChar = BASE_CHARS[c];
-        }
-        if (baseChar >= 'A' && baseChar <= 'Z') {
-            return (char)(baseChar | 32);
-        } else if (baseChar > 127) {
-            return Character.toLowerCase(baseChar);
-        }
-        return baseChar;
-    }
-
-    /**
-     * Table mapping most combined Latin, Greek, and Cyrillic characters
-     * to their base characters.  If c is in range, BASE_CHARS[c] == c
-     * if c is not a combined character, or the base character if it
-     * is combined.
-     *
-     * cf. native/jni/src/utils/char_utils.cpp
-     */
-    private static final char BASE_CHARS[] = {
-        /* U+0000 */ 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
-        /* U+0008 */ 0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
-        /* U+0010 */ 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
-        /* U+0018 */ 0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F,
-        /* U+0020 */ 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
-        /* U+0028 */ 0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
-        /* U+0030 */ 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
-        /* U+0038 */ 0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
-        /* U+0040 */ 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
-        /* U+0048 */ 0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
-        /* U+0050 */ 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
-        /* U+0058 */ 0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
-        /* U+0060 */ 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
-        /* U+0068 */ 0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
-        /* U+0070 */ 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
-        /* U+0078 */ 0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007F,
-        /* U+0080 */ 0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
-        /* U+0088 */ 0x0088, 0x0089, 0x008A, 0x008B, 0x008C, 0x008D, 0x008E, 0x008F,
-        /* U+0090 */ 0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
-        /* U+0098 */ 0x0098, 0x0099, 0x009A, 0x009B, 0x009C, 0x009D, 0x009E, 0x009F,
-        /* U+00A0 */ 0x0020, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
-        /* U+00A8 */ 0x0020, 0x00A9, 0x0061, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x0020,
-        /* U+00B0 */ 0x00B0, 0x00B1, 0x0032, 0x0033, 0x0020, 0x03BC, 0x00B6, 0x00B7,
-        /* U+00B8 */ 0x0020, 0x0031, 0x006F, 0x00BB, 0x0031, 0x0031, 0x0033, 0x00BF,
-        /* U+00C0 */ 0x0041, 0x0041, 0x0041, 0x0041, 0x0041, 0x0041, 0x00C6, 0x0043,
-        /* U+00C8 */ 0x0045, 0x0045, 0x0045, 0x0045, 0x0049, 0x0049, 0x0049, 0x0049,
-        /* U+00D0 */ 0x00D0, 0x004E, 0x004F, 0x004F, 0x004F, 0x004F, 0x004F, 0x00D7,
-        /* U+00D8 */ 0x004F, 0x0055, 0x0055, 0x0055, 0x0055, 0x0059, 0x00DE, 0x0073,
-            // U+00D8: Manually changed from 00D8 to 004F
-              // TODO: Check if it's really acceptable to consider Ø a diacritical variant of O
-            // U+00DF: Manually changed from 00DF to 0073
-        /* U+00E0 */ 0x0061, 0x0061, 0x0061, 0x0061, 0x0061, 0x0061, 0x00E6, 0x0063,
-        /* U+00E8 */ 0x0065, 0x0065, 0x0065, 0x0065, 0x0069, 0x0069, 0x0069, 0x0069,
-        /* U+00F0 */ 0x00F0, 0x006E, 0x006F, 0x006F, 0x006F, 0x006F, 0x006F, 0x00F7,
-        /* U+00F8 */ 0x006F, 0x0075, 0x0075, 0x0075, 0x0075, 0x0079, 0x00FE, 0x0079,
-            // U+00F8: Manually changed from 00F8 to 006F
-              // TODO: Check if it's really acceptable to consider ø a diacritical variant of o
-        /* U+0100 */ 0x0041, 0x0061, 0x0041, 0x0061, 0x0041, 0x0061, 0x0043, 0x0063,
-        /* U+0108 */ 0x0043, 0x0063, 0x0043, 0x0063, 0x0043, 0x0063, 0x0044, 0x0064,
-        /* U+0110 */ 0x0110, 0x0111, 0x0045, 0x0065, 0x0045, 0x0065, 0x0045, 0x0065,
-        /* U+0118 */ 0x0045, 0x0065, 0x0045, 0x0065, 0x0047, 0x0067, 0x0047, 0x0067,
-        /* U+0120 */ 0x0047, 0x0067, 0x0047, 0x0067, 0x0048, 0x0068, 0x0126, 0x0127,
-        /* U+0128 */ 0x0049, 0x0069, 0x0049, 0x0069, 0x0049, 0x0069, 0x0049, 0x0069,
-        /* U+0130 */ 0x0049, 0x0131, 0x0049, 0x0069, 0x004A, 0x006A, 0x004B, 0x006B,
-        /* U+0138 */ 0x0138, 0x004C, 0x006C, 0x004C, 0x006C, 0x004C, 0x006C, 0x004C,
-        /* U+0140 */ 0x006C, 0x004C, 0x006C, 0x004E, 0x006E, 0x004E, 0x006E, 0x004E,
-            // U+0141: Manually changed from 0141 to 004C
-            // U+0142: Manually changed from 0142 to 006C
-        /* U+0148 */ 0x006E, 0x02BC, 0x014A, 0x014B, 0x004F, 0x006F, 0x004F, 0x006F,
-        /* U+0150 */ 0x004F, 0x006F, 0x0152, 0x0153, 0x0052, 0x0072, 0x0052, 0x0072,
-        /* U+0158 */ 0x0052, 0x0072, 0x0053, 0x0073, 0x0053, 0x0073, 0x0053, 0x0073,
-        /* U+0160 */ 0x0053, 0x0073, 0x0054, 0x0074, 0x0054, 0x0074, 0x0166, 0x0167,
-        /* U+0168 */ 0x0055, 0x0075, 0x0055, 0x0075, 0x0055, 0x0075, 0x0055, 0x0075,
-        /* U+0170 */ 0x0055, 0x0075, 0x0055, 0x0075, 0x0057, 0x0077, 0x0059, 0x0079,
-        /* U+0178 */ 0x0059, 0x005A, 0x007A, 0x005A, 0x007A, 0x005A, 0x007A, 0x0073,
-        /* U+0180 */ 0x0180, 0x0181, 0x0182, 0x0183, 0x0184, 0x0185, 0x0186, 0x0187,
-        /* U+0188 */ 0x0188, 0x0189, 0x018A, 0x018B, 0x018C, 0x018D, 0x018E, 0x018F,
-        /* U+0190 */ 0x0190, 0x0191, 0x0192, 0x0193, 0x0194, 0x0195, 0x0196, 0x0197,
-        /* U+0198 */ 0x0198, 0x0199, 0x019A, 0x019B, 0x019C, 0x019D, 0x019E, 0x019F,
-        /* U+01A0 */ 0x004F, 0x006F, 0x01A2, 0x01A3, 0x01A4, 0x01A5, 0x01A6, 0x01A7,
-        /* U+01A8 */ 0x01A8, 0x01A9, 0x01AA, 0x01AB, 0x01AC, 0x01AD, 0x01AE, 0x0055,
-        /* U+01B0 */ 0x0075, 0x01B1, 0x01B2, 0x01B3, 0x01B4, 0x01B5, 0x01B6, 0x01B7,
-        /* U+01B8 */ 0x01B8, 0x01B9, 0x01BA, 0x01BB, 0x01BC, 0x01BD, 0x01BE, 0x01BF,
-        /* U+01C0 */ 0x01C0, 0x01C1, 0x01C2, 0x01C3, 0x0044, 0x0044, 0x0064, 0x004C,
-        /* U+01C8 */ 0x004C, 0x006C, 0x004E, 0x004E, 0x006E, 0x0041, 0x0061, 0x0049,
-        /* U+01D0 */ 0x0069, 0x004F, 0x006F, 0x0055, 0x0075, 0x0055, 0x0075, 0x0055,
-            // U+01D5: Manually changed from 00DC to 0055
-            // U+01D6: Manually changed from 00FC to 0075
-            // U+01D7: Manually changed from 00DC to 0055
-        /* U+01D8 */ 0x0075, 0x0055, 0x0075, 0x0055, 0x0075, 0x01DD, 0x0041, 0x0061,
-            // U+01D8: Manually changed from 00FC to 0075
-            // U+01D9: Manually changed from 00DC to 0055
-            // U+01DA: Manually changed from 00FC to 0075
-            // U+01DB: Manually changed from 00DC to 0055
-            // U+01DC: Manually changed from 00FC to 0075
-            // U+01DE: Manually changed from 00C4 to 0041
-            // U+01DF: Manually changed from 00E4 to 0061
-        /* U+01E0 */ 0x0041, 0x0061, 0x00C6, 0x00E6, 0x01E4, 0x01E5, 0x0047, 0x0067,
-            // U+01E0: Manually changed from 0226 to 0041
-            // U+01E1: Manually changed from 0227 to 0061
-        /* U+01E8 */ 0x004B, 0x006B, 0x004F, 0x006F, 0x004F, 0x006F, 0x01B7, 0x0292,
-            // U+01EC: Manually changed from 01EA to 004F
-            // U+01ED: Manually changed from 01EB to 006F
-        /* U+01F0 */ 0x006A, 0x0044, 0x0044, 0x0064, 0x0047, 0x0067, 0x01F6, 0x01F7,
-        /* U+01F8 */ 0x004E, 0x006E, 0x0041, 0x0061, 0x00C6, 0x00E6, 0x004F, 0x006F,
-            // U+01FA: Manually changed from 00C5 to 0041
-            // U+01FB: Manually changed from 00E5 to 0061
-            // U+01FE: Manually changed from 00D8 to 004F
-              // TODO: Check if it's really acceptable to consider Ø a diacritical variant of O
-            // U+01FF: Manually changed from 00F8 to 006F
-              // TODO: Check if it's really acceptable to consider ø a diacritical variant of o
-        /* U+0200 */ 0x0041, 0x0061, 0x0041, 0x0061, 0x0045, 0x0065, 0x0045, 0x0065,
-        /* U+0208 */ 0x0049, 0x0069, 0x0049, 0x0069, 0x004F, 0x006F, 0x004F, 0x006F,
-        /* U+0210 */ 0x0052, 0x0072, 0x0052, 0x0072, 0x0055, 0x0075, 0x0055, 0x0075,
-        /* U+0218 */ 0x0053, 0x0073, 0x0054, 0x0074, 0x021C, 0x021D, 0x0048, 0x0068,
-        /* U+0220 */ 0x0220, 0x0221, 0x0222, 0x0223, 0x0224, 0x0225, 0x0041, 0x0061,
-        /* U+0228 */ 0x0045, 0x0065, 0x004F, 0x006F, 0x004F, 0x006F, 0x004F, 0x006F,
-            // U+022A: Manually changed from 00D6 to 004F
-            // U+022B: Manually changed from 00F6 to 006F
-            // U+022C: Manually changed from 00D5 to 004F
-            // U+022D: Manually changed from 00F5 to 006F
-        /* U+0230 */ 0x004F, 0x006F, 0x0059, 0x0079, 0x0234, 0x0235, 0x0236, 0x0237,
-            // U+0230: Manually changed from 022E to 004F
-            // U+0231: Manually changed from 022F to 006F
-        /* U+0238 */ 0x0238, 0x0239, 0x023A, 0x023B, 0x023C, 0x023D, 0x023E, 0x023F,
-        /* U+0240 */ 0x0240, 0x0241, 0x0242, 0x0243, 0x0244, 0x0245, 0x0246, 0x0247,
-        /* U+0248 */ 0x0248, 0x0249, 0x024A, 0x024B, 0x024C, 0x024D, 0x024E, 0x024F,
-        /* U+0250 */ 0x0250, 0x0251, 0x0252, 0x0253, 0x0254, 0x0255, 0x0256, 0x0257,
-        /* U+0258 */ 0x0258, 0x0259, 0x025A, 0x025B, 0x025C, 0x025D, 0x025E, 0x025F,
-        /* U+0260 */ 0x0260, 0x0261, 0x0262, 0x0263, 0x0264, 0x0265, 0x0266, 0x0267,
-        /* U+0268 */ 0x0268, 0x0269, 0x026A, 0x026B, 0x026C, 0x026D, 0x026E, 0x026F,
-        /* U+0270 */ 0x0270, 0x0271, 0x0272, 0x0273, 0x0274, 0x0275, 0x0276, 0x0277,
-        /* U+0278 */ 0x0278, 0x0279, 0x027A, 0x027B, 0x027C, 0x027D, 0x027E, 0x027F,
-        /* U+0280 */ 0x0280, 0x0281, 0x0282, 0x0283, 0x0284, 0x0285, 0x0286, 0x0287,
-        /* U+0288 */ 0x0288, 0x0289, 0x028A, 0x028B, 0x028C, 0x028D, 0x028E, 0x028F,
-        /* U+0290 */ 0x0290, 0x0291, 0x0292, 0x0293, 0x0294, 0x0295, 0x0296, 0x0297,
-        /* U+0298 */ 0x0298, 0x0299, 0x029A, 0x029B, 0x029C, 0x029D, 0x029E, 0x029F,
-        /* U+02A0 */ 0x02A0, 0x02A1, 0x02A2, 0x02A3, 0x02A4, 0x02A5, 0x02A6, 0x02A7,
-        /* U+02A8 */ 0x02A8, 0x02A9, 0x02AA, 0x02AB, 0x02AC, 0x02AD, 0x02AE, 0x02AF,
-        /* U+02B0 */ 0x0068, 0x0266, 0x006A, 0x0072, 0x0279, 0x027B, 0x0281, 0x0077,
-        /* U+02B8 */ 0x0079, 0x02B9, 0x02BA, 0x02BB, 0x02BC, 0x02BD, 0x02BE, 0x02BF,
-        /* U+02C0 */ 0x02C0, 0x02C1, 0x02C2, 0x02C3, 0x02C4, 0x02C5, 0x02C6, 0x02C7,
-        /* U+02C8 */ 0x02C8, 0x02C9, 0x02CA, 0x02CB, 0x02CC, 0x02CD, 0x02CE, 0x02CF,
-        /* U+02D0 */ 0x02D0, 0x02D1, 0x02D2, 0x02D3, 0x02D4, 0x02D5, 0x02D6, 0x02D7,
-        /* U+02D8 */ 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x02DE, 0x02DF,
-        /* U+02E0 */ 0x0263, 0x006C, 0x0073, 0x0078, 0x0295, 0x02E5, 0x02E6, 0x02E7,
-        /* U+02E8 */ 0x02E8, 0x02E9, 0x02EA, 0x02EB, 0x02EC, 0x02ED, 0x02EE, 0x02EF,
-        /* U+02F0 */ 0x02F0, 0x02F1, 0x02F2, 0x02F3, 0x02F4, 0x02F5, 0x02F6, 0x02F7,
-        /* U+02F8 */ 0x02F8, 0x02F9, 0x02FA, 0x02FB, 0x02FC, 0x02FD, 0x02FE, 0x02FF,
-        /* U+0300 */ 0x0300, 0x0301, 0x0302, 0x0303, 0x0304, 0x0305, 0x0306, 0x0307,
-        /* U+0308 */ 0x0308, 0x0309, 0x030A, 0x030B, 0x030C, 0x030D, 0x030E, 0x030F,
-        /* U+0310 */ 0x0310, 0x0311, 0x0312, 0x0313, 0x0314, 0x0315, 0x0316, 0x0317,
-        /* U+0318 */ 0x0318, 0x0319, 0x031A, 0x031B, 0x031C, 0x031D, 0x031E, 0x031F,
-        /* U+0320 */ 0x0320, 0x0321, 0x0322, 0x0323, 0x0324, 0x0325, 0x0326, 0x0327,
-        /* U+0328 */ 0x0328, 0x0329, 0x032A, 0x032B, 0x032C, 0x032D, 0x032E, 0x032F,
-        /* U+0330 */ 0x0330, 0x0331, 0x0332, 0x0333, 0x0334, 0x0335, 0x0336, 0x0337,
-        /* U+0338 */ 0x0338, 0x0339, 0x033A, 0x033B, 0x033C, 0x033D, 0x033E, 0x033F,
-        /* U+0340 */ 0x0300, 0x0301, 0x0342, 0x0313, 0x0308, 0x0345, 0x0346, 0x0347,
-        /* U+0348 */ 0x0348, 0x0349, 0x034A, 0x034B, 0x034C, 0x034D, 0x034E, 0x034F,
-        /* U+0350 */ 0x0350, 0x0351, 0x0352, 0x0353, 0x0354, 0x0355, 0x0356, 0x0357,
-        /* U+0358 */ 0x0358, 0x0359, 0x035A, 0x035B, 0x035C, 0x035D, 0x035E, 0x035F,
-        /* U+0360 */ 0x0360, 0x0361, 0x0362, 0x0363, 0x0364, 0x0365, 0x0366, 0x0367,
-        /* U+0368 */ 0x0368, 0x0369, 0x036A, 0x036B, 0x036C, 0x036D, 0x036E, 0x036F,
-        /* U+0370 */ 0x0370, 0x0371, 0x0372, 0x0373, 0x02B9, 0x0375, 0x0376, 0x0377,
-        /* U+0378 */ 0x0378, 0x0379, 0x0020, 0x037B, 0x037C, 0x037D, 0x003B, 0x037F,
-        /* U+0380 */ 0x0380, 0x0381, 0x0382, 0x0383, 0x0020, 0x00A8, 0x0391, 0x00B7,
-        /* U+0388 */ 0x0395, 0x0397, 0x0399, 0x038B, 0x039F, 0x038D, 0x03A5, 0x03A9,
-        /* U+0390 */ 0x03CA, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396, 0x0397,
-        /* U+0398 */ 0x0398, 0x0399, 0x039A, 0x039B, 0x039C, 0x039D, 0x039E, 0x039F,
-        /* U+03A0 */ 0x03A0, 0x03A1, 0x03A2, 0x03A3, 0x03A4, 0x03A5, 0x03A6, 0x03A7,
-        /* U+03A8 */ 0x03A8, 0x03A9, 0x0399, 0x03A5, 0x03B1, 0x03B5, 0x03B7, 0x03B9,
-        /* U+03B0 */ 0x03CB, 0x03B1, 0x03B2, 0x03B3, 0x03B4, 0x03B5, 0x03B6, 0x03B7,
-        /* U+03B8 */ 0x03B8, 0x03B9, 0x03BA, 0x03BB, 0x03BC, 0x03BD, 0x03BE, 0x03BF,
-        /* U+03C0 */ 0x03C0, 0x03C1, 0x03C2, 0x03C3, 0x03C4, 0x03C5, 0x03C6, 0x03C7,
-        /* U+03C8 */ 0x03C8, 0x03C9, 0x03B9, 0x03C5, 0x03BF, 0x03C5, 0x03C9, 0x03CF,
-        /* U+03D0 */ 0x03B2, 0x03B8, 0x03A5, 0x03D2, 0x03D2, 0x03C6, 0x03C0, 0x03D7,
-        /* U+03D8 */ 0x03D8, 0x03D9, 0x03DA, 0x03DB, 0x03DC, 0x03DD, 0x03DE, 0x03DF,
-        /* U+03E0 */ 0x03E0, 0x03E1, 0x03E2, 0x03E3, 0x03E4, 0x03E5, 0x03E6, 0x03E7,
-        /* U+03E8 */ 0x03E8, 0x03E9, 0x03EA, 0x03EB, 0x03EC, 0x03ED, 0x03EE, 0x03EF,
-        /* U+03F0 */ 0x03BA, 0x03C1, 0x03C2, 0x03F3, 0x0398, 0x03B5, 0x03F6, 0x03F7,
-        /* U+03F8 */ 0x03F8, 0x03A3, 0x03FA, 0x03FB, 0x03FC, 0x03FD, 0x03FE, 0x03FF,
-        /* U+0400 */ 0x0415, 0x0415, 0x0402, 0x0413, 0x0404, 0x0405, 0x0406, 0x0406,
-        /* U+0408 */ 0x0408, 0x0409, 0x040A, 0x040B, 0x041A, 0x0418, 0x0423, 0x040F,
-        /* U+0410 */ 0x0410, 0x0411, 0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417,
-        /* U+0418 */ 0x0418, 0x0419, 0x041A, 0x041B, 0x041C, 0x041D, 0x041E, 0x041F,
-            // U+0419: Manually changed from 0418 to 0419
-        /* U+0420 */ 0x0420, 0x0421, 0x0422, 0x0423, 0x0424, 0x0425, 0x0426, 0x0427,
-        /* U+0428 */ 0x0428, 0x0429, 0x042C, 0x042B, 0x042C, 0x042D, 0x042E, 0x042F,
-            // U+042A: Manually changed from 042A to 042C
-        /* U+0430 */ 0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437,
-        /* U+0438 */ 0x0438, 0x0439, 0x043A, 0x043B, 0x043C, 0x043D, 0x043E, 0x043F,
-            // U+0439: Manually changed from 0438 to 0439
-        /* U+0440 */ 0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447,
-        /* U+0448 */ 0x0448, 0x0449, 0x044C, 0x044B, 0x044C, 0x044D, 0x044E, 0x044F,
-            // U+044A: Manually changed from 044A to 044C
-        /* U+0450 */ 0x0435, 0x0435, 0x0452, 0x0433, 0x0454, 0x0455, 0x0456, 0x0456,
-        /* U+0458 */ 0x0458, 0x0459, 0x045A, 0x045B, 0x043A, 0x0438, 0x0443, 0x045F,
-        /* U+0460 */ 0x0460, 0x0461, 0x0462, 0x0463, 0x0464, 0x0465, 0x0466, 0x0467,
-        /* U+0468 */ 0x0468, 0x0469, 0x046A, 0x046B, 0x046C, 0x046D, 0x046E, 0x046F,
-        /* U+0470 */ 0x0470, 0x0471, 0x0472, 0x0473, 0x0474, 0x0475, 0x0474, 0x0475,
-        /* U+0478 */ 0x0478, 0x0479, 0x047A, 0x047B, 0x047C, 0x047D, 0x047E, 0x047F,
-        /* U+0480 */ 0x0480, 0x0481, 0x0482, 0x0483, 0x0484, 0x0485, 0x0486, 0x0487,
-        /* U+0488 */ 0x0488, 0x0489, 0x048A, 0x048B, 0x048C, 0x048D, 0x048E, 0x048F,
-        /* U+0490 */ 0x0490, 0x0491, 0x0492, 0x0493, 0x0494, 0x0495, 0x0496, 0x0497,
-        /* U+0498 */ 0x0498, 0x0499, 0x049A, 0x049B, 0x049C, 0x049D, 0x049E, 0x049F,
-        /* U+04A0 */ 0x04A0, 0x04A1, 0x04A2, 0x04A3, 0x04A4, 0x04A5, 0x04A6, 0x04A7,
-        /* U+04A8 */ 0x04A8, 0x04A9, 0x04AA, 0x04AB, 0x04AC, 0x04AD, 0x04AE, 0x04AF,
-        /* U+04B0 */ 0x04B0, 0x04B1, 0x04B2, 0x04B3, 0x04B4, 0x04B5, 0x04B6, 0x04B7,
-        /* U+04B8 */ 0x04B8, 0x04B9, 0x04BA, 0x04BB, 0x04BC, 0x04BD, 0x04BE, 0x04BF,
-        /* U+04C0 */ 0x04C0, 0x0416, 0x0436, 0x04C3, 0x04C4, 0x04C5, 0x04C6, 0x04C7,
-        /* U+04C8 */ 0x04C8, 0x04C9, 0x04CA, 0x04CB, 0x04CC, 0x04CD, 0x04CE, 0x04CF,
-        /* U+04D0 */ 0x0410, 0x0430, 0x0410, 0x0430, 0x04D4, 0x04D5, 0x0415, 0x0435,
-        /* U+04D8 */ 0x04D8, 0x04D9, 0x04D8, 0x04D9, 0x0416, 0x0436, 0x0417, 0x0437,
-        /* U+04E0 */ 0x04E0, 0x04E1, 0x0418, 0x0438, 0x0418, 0x0438, 0x041E, 0x043E,
-        /* U+04E8 */ 0x04E8, 0x04E9, 0x04E8, 0x04E9, 0x042D, 0x044D, 0x0423, 0x0443,
-        /* U+04F0 */ 0x0423, 0x0443, 0x0423, 0x0443, 0x0427, 0x0447, 0x04F6, 0x04F7,
-        /* U+04F8 */ 0x042B, 0x044B, 0x04FA, 0x04FB, 0x04FC, 0x04FD, 0x04FE, 0x04FF,
-    };
-}
diff --git a/java/src/com/android/inputmethod/latin/InputAttributes.java b/java/src/com/android/inputmethod/latin/InputAttributes.java
index 8caf6f1..b01bc4b 100644
--- a/java/src/com/android/inputmethod/latin/InputAttributes.java
+++ b/java/src/com/android/inputmethod/latin/InputAttributes.java
@@ -29,6 +29,7 @@
 public final class InputAttributes {
     private final String TAG = InputAttributes.class.getSimpleName();
 
+    final public String mTargetApplicationPackageName;
     final public boolean mInputTypeNoAutoCorrect;
     final public boolean mIsSettingsSuggestionStripOn;
     final public boolean mApplicationSpecifiedCompletionOn;
@@ -36,6 +37,7 @@
     final private int mInputType;
 
     public InputAttributes(final EditorInfo editorInfo, final boolean isFullscreenMode) {
+        mTargetApplicationPackageName = null != editorInfo ? editorInfo.packageName : null;
         final int inputType = null != editorInfo ? editorInfo.inputType : 0;
         final int inputClass = inputType & InputType.TYPE_MASK_CLASS;
         mInputType = inputType;
@@ -52,8 +54,7 @@
             } else if (inputClass == 0) {
                 // TODO: is this check still necessary?
                 Log.w(TAG, String.format("Unexpected input class: inputType=0x%08x"
-                        + " imeOptions=0x%08x",
-                        inputType, editorInfo.imeOptions));
+                        + " imeOptions=0x%08x", inputType, editorInfo.imeOptions));
             }
             mIsSettingsSuggestionStripOn = false;
             mInputTypeNoAutoCorrect = false;
@@ -204,8 +205,7 @@
     public static boolean inPrivateImeOptions(String packageName, String key,
             EditorInfo editorInfo) {
         if (editorInfo == null) return false;
-        final String findingKey = (packageName != null) ? packageName + "." + key
-                : key;
+        final String findingKey = (packageName != null) ? packageName + "." + key : key;
         return StringUtils.containsInCommaSplittableText(findingKey, editorInfo.privateImeOptions);
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/InputView.java b/java/src/com/android/inputmethod/latin/InputView.java
index 81ccf83..76b0912 100644
--- a/java/src/com/android/inputmethod/latin/InputView.java
+++ b/java/src/com/android/inputmethod/latin/InputView.java
@@ -23,87 +23,203 @@
 import android.view.View;
 import android.widget.LinearLayout;
 
-public final class InputView extends LinearLayout {
-    private View mSuggestionStripView;
-    private View mKeyboardView;
-    private int mKeyboardTopPadding;
+import com.android.inputmethod.keyboard.MainKeyboardView;
+import com.android.inputmethod.latin.suggestions.MoreSuggestionsView;
+import com.android.inputmethod.latin.suggestions.SuggestionStripView;
 
-    private boolean mIsForwardingEvent;
+public final class InputView extends LinearLayout {
     private final Rect mInputViewRect = new Rect();
-    private final Rect mEventForwardingRect = new Rect();
-    private final Rect mEventReceivingRect = new Rect();
+    private KeyboardTopPaddingForwarder mKeyboardTopPaddingForwarder;
+    private MoreSuggestionsViewCanceler mMoreSuggestionsViewCanceler;
 
     public InputView(final Context context, final AttributeSet attrs) {
         super(context, attrs, 0);
     }
 
-    public void setKeyboardGeometry(final int keyboardTopPadding) {
-        mKeyboardTopPadding = keyboardTopPadding;
-    }
-
     @Override
     protected void onFinishInflate() {
-        mSuggestionStripView = findViewById(R.id.suggestion_strip_view);
-        mKeyboardView = findViewById(R.id.keyboard_view);
+        final SuggestionStripView suggestionStripView =
+                (SuggestionStripView)findViewById(R.id.suggestion_strip_view);
+        final MainKeyboardView mainKeyboardView =
+                (MainKeyboardView)findViewById(R.id.keyboard_view);
+        mKeyboardTopPaddingForwarder = new KeyboardTopPaddingForwarder(
+                mainKeyboardView, suggestionStripView);
+        mMoreSuggestionsViewCanceler = new MoreSuggestionsViewCanceler(
+                mainKeyboardView, suggestionStripView);
+    }
+
+    public void setKeyboardTopPadding(final int keyboardTopPadding) {
+        mKeyboardTopPaddingForwarder.setKeyboardTopPadding(keyboardTopPadding);
     }
 
     @Override
     public boolean dispatchTouchEvent(final MotionEvent me) {
-        if (mSuggestionStripView.getVisibility() != VISIBLE
-                || mKeyboardView.getVisibility() != VISIBLE) {
-            return super.dispatchTouchEvent(me);
-        }
-
-        // The touch events that hit the top padding of keyboard should be forwarded to
-        // {@link SuggestionStripView}.
         final Rect rect = mInputViewRect;
-        this.getGlobalVisibleRect(rect);
+        getGlobalVisibleRect(rect);
         final int x = (int)me.getX() + rect.left;
         final int y = (int)me.getY() + rect.top;
 
-        final Rect forwardingRect = mEventForwardingRect;
-        mKeyboardView.getGlobalVisibleRect(forwardingRect);
-        if (!mIsForwardingEvent && !forwardingRect.contains(x, y)) {
-            return super.dispatchTouchEvent(me);
+        // The touch events that hit the top padding of keyboard should be
+        // forwarded to {@link SuggestionStripView}.
+        if (mKeyboardTopPaddingForwarder.dispatchTouchEvent(x, y, me)) {
+            return true;
+        }
+        // To cancel {@link MoreSuggestionsView}, we should intercept a touch event to
+        // {@link MainKeyboardView} and dismiss the {@link MoreSuggestionsView}.
+        if (mMoreSuggestionsViewCanceler.dispatchTouchEvent(x, y, me)) {
+            return true;
+        }
+        return super.dispatchTouchEvent(me);
+    }
+
+    /**
+     * This class forwards series of {@link MotionEvent}s from <code>Forwarder</code> view to
+     * <code>Receiver</code> view.
+     *
+     * @param <Sender> a {@link View} that may send a {@link MotionEvent} to <Receiver>.
+     * @param <Receiver> a {@link View} that receives forwarded {@link MotionEvent} from
+     *     <Forwarder>.
+     */
+    private static abstract class MotionEventForwarder<Sender extends View, Receiver extends View> {
+        protected final Sender mSenderView;
+        protected final Receiver mReceiverView;
+
+        private boolean mIsForwardingEvent;
+        protected final Rect mEventSendingRect = new Rect();
+        protected final Rect mEventReceivingRect = new Rect();
+
+        public MotionEventForwarder(final Sender senderView, final Receiver receiverView) {
+            mSenderView = senderView;
+            mReceiverView = receiverView;
         }
 
-        final int forwardingLimitY = forwardingRect.top + mKeyboardTopPadding;
-        boolean sendToTarget = false;
+        // Return true if a touch event of global coordinate x, y needs to be forwarded.
+        protected abstract boolean needsToForward(final int x, final int y);
 
-        switch (me.getAction()) {
-        case MotionEvent.ACTION_DOWN:
-            if (y < forwardingLimitY) {
-                // This down event and further move and up events should be forwarded to the target.
-                mIsForwardingEvent = true;
-                sendToTarget = true;
+        // Translate global x-coordinate to <code>Receiver</code> local coordinate.
+        protected int translateX(final int x) {
+            return x - mEventReceivingRect.left;
+        }
+
+        // Translate global y-coordinate to <code>Receiver</code> local coordinate.
+        protected int translateY(final int y) {
+            return y - mEventReceivingRect.top;
+        }
+
+        // Callback when a {@link MotionEvent} is forwarded.
+        protected void onForwardingEvent(final MotionEvent me) {}
+
+        // Dispatches a {@link MotioneEvent} to <code>Receiver</code> if needed and returns true.
+        // Otherwise returns false.
+        public boolean dispatchTouchEvent(final int x, final int y, final MotionEvent me) {
+            // Forwards a {link MotionEvent} only if both <code>Sender</code> and
+            // <code>Receiver</code> are visible.
+            if (mSenderView.getVisibility() != View.VISIBLE ||
+                    mReceiverView.getVisibility() != View.VISIBLE) {
+                return false;
             }
-            break;
-        case MotionEvent.ACTION_MOVE:
-            sendToTarget = mIsForwardingEvent;
-            break;
-        case MotionEvent.ACTION_UP:
-        case MotionEvent.ACTION_CANCEL:
-            sendToTarget = mIsForwardingEvent;
-            mIsForwardingEvent = false;
-            break;
+            final Rect sendingRect = mEventSendingRect;
+            mSenderView.getGlobalVisibleRect(sendingRect);
+            if (!mIsForwardingEvent && !sendingRect.contains(x, y)) {
+                return false;
+            }
+
+            boolean shouldForwardToReceiver = false;
+
+            switch (me.getActionMasked()) {
+            case MotionEvent.ACTION_DOWN:
+                // If the down event happens in the forwarding area, successive {@link MotionEvent}s
+                // should be forwarded.
+                if (needsToForward(x, y)) {
+                    mIsForwardingEvent = true;
+                    shouldForwardToReceiver = true;
+                }
+                break;
+            case MotionEvent.ACTION_MOVE:
+                shouldForwardToReceiver = mIsForwardingEvent;
+                break;
+            case MotionEvent.ACTION_UP:
+            case MotionEvent.ACTION_CANCEL:
+                shouldForwardToReceiver = mIsForwardingEvent;
+                mIsForwardingEvent = false;
+                break;
+            }
+
+            if (!shouldForwardToReceiver) {
+                return false;
+            }
+
+            final Rect receivingRect = mEventReceivingRect;
+            mReceiverView.getGlobalVisibleRect(receivingRect);
+            // Translate global coordinates to <code>Receiver</code> local coordinates.
+            me.setLocation(translateX(x), translateY(y));
+            mReceiverView.dispatchTouchEvent(me);
+            onForwardingEvent(me);
+            return true;
+        }
+    }
+
+    /**
+     * This class forwards {@link MotionEvent}s happened in the top padding of
+     * {@link MainKeyboardView} to {@link SuggestionStripView}.
+     */
+    private static class KeyboardTopPaddingForwarder
+            extends MotionEventForwarder<MainKeyboardView, SuggestionStripView> {
+        private int mKeyboardTopPadding;
+
+        public KeyboardTopPaddingForwarder(final MainKeyboardView mainKeyboardView,
+                final SuggestionStripView suggestionStripView) {
+            super(mainKeyboardView, suggestionStripView);
         }
 
-        if (!sendToTarget) {
-            return super.dispatchTouchEvent(me);
+        public void setKeyboardTopPadding(final int keyboardTopPadding) {
+            mKeyboardTopPadding = keyboardTopPadding;
         }
 
-        final Rect receivingRect = mEventReceivingRect;
-        mSuggestionStripView.getGlobalVisibleRect(receivingRect);
-        final int translatedX = x - receivingRect.left;
-        final int translatedY;
-        if (y < forwardingLimitY) {
-            // The forwarded event should have coordinates that are inside of the target.
-            translatedY = Math.min(y - receivingRect.top, receivingRect.height() - 1);
-        } else {
-            translatedY = y - receivingRect.top;
+        private boolean isInKeyboardTopPadding(final int y) {
+            return y < mEventSendingRect.top + mKeyboardTopPadding;
         }
-        me.setLocation(translatedX, translatedY);
-        mSuggestionStripView.dispatchTouchEvent(me);
-        return true;
+
+        @Override
+        protected boolean needsToForward(final int x, final int y) {
+            return isInKeyboardTopPadding(y);
+        }
+
+        @Override
+        protected int translateY(final int y) {
+            final int translatedY = super.translateY(y);
+            if (isInKeyboardTopPadding(y)) {
+                // The forwarded event should have coordinates that are inside of
+                // the target.
+                return Math.min(translatedY, mEventReceivingRect.height() - 1);
+            }
+            return translatedY;
+        }
+    }
+
+    /**
+     * This class forwards {@link MotionEvent}s happened in the {@link MainKeyboardView} to
+     * {@link SuggestionStripView} when the {@link MoreSuggestionsView} is showing.
+     * {@link SuggestionStripView} dismisses {@link MoreSuggestionsView} when it receives those
+     * events.
+     */
+    private static class MoreSuggestionsViewCanceler
+            extends MotionEventForwarder<MainKeyboardView, SuggestionStripView> {
+        public MoreSuggestionsViewCanceler(final MainKeyboardView mainKeyboardView,
+                final SuggestionStripView suggestionStripView) {
+            super(mainKeyboardView, suggestionStripView);
+        }
+
+        @Override
+        protected boolean needsToForward(final int x, final int y) {
+            return mReceiverView.isShowingMoreSuggestionPanel() && mEventSendingRect.contains(x, y);
+        }
+
+        @Override
+        protected void onForwardingEvent(final MotionEvent me) {
+            if (me.getActionMasked() == MotionEvent.ACTION_DOWN) {
+                mReceiverView.dismissMoreSuggestionsPanel();
+            }
+        }
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 77d0701..8ea868d 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -28,7 +28,6 @@
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
-import android.content.pm.PackageInfo;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Rect;
@@ -36,39 +35,30 @@
 import android.media.AudioManager;
 import android.net.ConnectivityManager;
 import android.os.Debug;
-import android.os.Handler;
-import android.os.HandlerThread;
 import android.os.IBinder;
 import android.os.Message;
 import android.os.SystemClock;
 import android.preference.PreferenceManager;
 import android.text.InputType;
 import android.text.TextUtils;
-import android.text.style.SuggestionSpan;
 import android.util.Log;
 import android.util.Pair;
 import android.util.PrintWriterPrinter;
 import android.util.Printer;
-import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.View;
 import android.view.ViewGroup.LayoutParams;
 import android.view.Window;
 import android.view.WindowManager;
 import android.view.inputmethod.CompletionInfo;
-import android.view.inputmethod.CorrectionInfo;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodSubtype;
 
 import com.android.inputmethod.accessibility.AccessibilityUtils;
 import com.android.inputmethod.accessibility.AccessibleKeyboardViewProxy;
 import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.compat.AppWorkaroundsUtils;
 import com.android.inputmethod.compat.InputMethodServiceCompatUtils;
-import com.android.inputmethod.compat.SuggestionSpanUtils;
 import com.android.inputmethod.dictionarypack.DictionaryPackConstants;
-import com.android.inputmethod.event.EventInterpreter;
-import com.android.inputmethod.keyboard.KeyDetector;
 import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.keyboard.KeyboardActionListener;
 import com.android.inputmethod.keyboard.KeyboardId;
@@ -77,157 +67,76 @@
 import com.android.inputmethod.latin.Suggest.OnGetSuggestedWordsCallback;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.define.ProductionFlag;
+import com.android.inputmethod.latin.inputlogic.InputLogic;
+import com.android.inputmethod.latin.inputlogic.SpaceState;
 import com.android.inputmethod.latin.personalization.DictionaryDecayBroadcastReciever;
-import com.android.inputmethod.latin.personalization.PersonalizationDictionary;
-import com.android.inputmethod.latin.personalization.PersonalizationDictionarySessionRegister;
+import com.android.inputmethod.latin.personalization.PersonalizationDictionarySessionRegistrar;
 import com.android.inputmethod.latin.personalization.PersonalizationHelper;
-import com.android.inputmethod.latin.personalization.PersonalizationPredictionDictionary;
-import com.android.inputmethod.latin.personalization.UserHistoryDictionary;
 import com.android.inputmethod.latin.settings.Settings;
 import com.android.inputmethod.latin.settings.SettingsActivity;
 import com.android.inputmethod.latin.settings.SettingsValues;
 import com.android.inputmethod.latin.suggestions.SuggestionStripView;
 import com.android.inputmethod.latin.utils.ApplicationUtils;
-import com.android.inputmethod.latin.utils.AsyncResultHolder;
-import com.android.inputmethod.latin.utils.AutoCorrectionUtils;
 import com.android.inputmethod.latin.utils.CapsModeUtils;
-import com.android.inputmethod.latin.utils.CollectionUtils;
 import com.android.inputmethod.latin.utils.CompletionInfoUtils;
-import com.android.inputmethod.latin.utils.InputTypeUtils;
 import com.android.inputmethod.latin.utils.IntentUtils;
 import com.android.inputmethod.latin.utils.JniUtils;
 import com.android.inputmethod.latin.utils.LatinImeLoggerUtils;
-import com.android.inputmethod.latin.utils.RecapitalizeStatus;
-import com.android.inputmethod.latin.utils.StaticInnerHandlerWrapper;
-import com.android.inputmethod.latin.utils.StringUtils;
-import com.android.inputmethod.latin.utils.TargetPackageInfoGetterTask;
-import com.android.inputmethod.latin.utils.TextRange;
-import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils;
+import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
 import com.android.inputmethod.research.ResearchLogger;
 
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.Locale;
-import java.util.TreeSet;
 
 /**
  * Input method implementation for Qwerty'ish keyboard.
  */
 public class LatinIME extends InputMethodService implements KeyboardActionListener,
-        SuggestionStripView.Listener, TargetPackageInfoGetterTask.OnTargetPackageInfoKnownListener,
-        Suggest.SuggestInitializationListener {
+        SuggestionStripView.Listener,
+        DictionaryFacilitatorForSuggest.DictionaryInitializationListener {
     private static final String TAG = LatinIME.class.getSimpleName();
     private static final boolean TRACE = false;
-    private static boolean DEBUG;
+    private static boolean DEBUG = false;
 
     private static final int EXTENDED_TOUCHABLE_REGION_HEIGHT = 100;
 
-    // How many continuous deletes at which to start deleting at a higher speed.
-    private static final int DELETE_ACCELERATE_AT = 20;
-    // Key events coming any faster than this are long-presses.
-    private static final int QUICK_PRESS = 200;
-
     private static final int PENDING_IMS_CALLBACK_DURATION = 800;
 
     private static final int PERIOD_FOR_AUDIO_AND_HAPTIC_FEEDBACK_IN_KEY_REPEAT = 2;
 
-    // TODO: Set this value appropriately.
-    private static final int GET_SUGGESTED_WORDS_TIMEOUT = 200;
-
     /**
      * The name of the scheme used by the Package Manager to warn of a new package installation,
      * replacement or removal.
      */
     private static final String SCHEME_PACKAGE = "package";
 
-    private static final int SPACE_STATE_NONE = 0;
-    // Double space: the state where the user pressed space twice quickly, which LatinIME
-    // resolved as period-space. Undoing this converts the period to a space.
-    private static final int SPACE_STATE_DOUBLE = 1;
-    // Swap punctuation: the state where a weak space and a punctuation from the suggestion strip
-    // have just been swapped. Undoing this swaps them back; the space is still considered weak.
-    private static final int SPACE_STATE_SWAP_PUNCTUATION = 2;
-    // Weak space: a space that should be swapped only by suggestion strip punctuation. Weak
-    // spaces happen when the user presses space, accepting the current suggestion (whether
-    // it's an auto-correction or not).
-    private static final int SPACE_STATE_WEAK = 3;
-    // Phantom space: a not-yet-inserted space that should get inserted on the next input,
-    // character provided it's not a separator. If it's a separator, the phantom space is dropped.
-    // Phantom spaces happen when a user chooses a word from the suggestion strip.
-    private static final int SPACE_STATE_PHANTOM = 4;
-
-    // Current space state of the input method. This can be any of the above constants.
-    private int mSpaceState;
-
     private final Settings mSettings;
+    private final InputLogic mInputLogic = new InputLogic(this);
 
     private View mExtractArea;
     private View mKeyPreviewBackingView;
     private SuggestionStripView mSuggestionStripView;
-    // Never null
-    private SuggestedWords mSuggestedWords = SuggestedWords.EMPTY;
-    private Suggest mSuggest;
+
     private CompletionInfo[] mApplicationSpecifiedCompletions;
-    private AppWorkaroundsUtils mAppWorkAroundsUtils = new AppWorkaroundsUtils();
 
     private RichInputMethodManager mRichImm;
     @UsedForTesting final KeyboardSwitcher mKeyboardSwitcher;
     private final SubtypeSwitcher mSubtypeSwitcher;
     private final SubtypeState mSubtypeState = new SubtypeState();
-    // At start, create a default event interpreter that does nothing by passing it no decoder spec.
-    // The event interpreter should never be null.
-    private EventInterpreter mEventInterpreter = new EventInterpreter(this);
-
-    private boolean mIsMainDictionaryAvailable;
-    private UserBinaryDictionary mUserDictionary;
-    private UserHistoryDictionary mUserHistoryDictionary;
-    private PersonalizationPredictionDictionary mPersonalizationPredictionDictionary;
-    private PersonalizationDictionary mPersonalizationDictionary;
-    private boolean mIsUserDictionaryAvailable;
-
-    private LastComposedWord mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
-    private final WordComposer mWordComposer = new WordComposer();
-    private final RichInputConnection mConnection = new RichInputConnection(this);
-    private final RecapitalizeStatus mRecapitalizeStatus = new RecapitalizeStatus();
-
-    // Keep track of the last selection range to decide if we need to show word alternatives
-    private static final int NOT_A_CURSOR_POSITION = -1;
-    private int mLastSelectionStart = NOT_A_CURSOR_POSITION;
-    private int mLastSelectionEnd = NOT_A_CURSOR_POSITION;
-
-    // Whether we are expecting an onUpdateSelection event to fire. If it does when we don't
-    // "expect" it, it means the user actually moved the cursor.
-    private boolean mExpectingUpdateSelection;
-    private int mDeleteCount;
-    private long mLastKeyTime;
-    private final TreeSet<Long> mCurrentlyPressedHardwareKeys = CollectionUtils.newTreeSet();
-    // Personalization debugging params
-    private boolean mUseOnlyPersonalizationDictionaryForDebug = false;
-    private boolean mBoostPersonalizationDictionaryForDebug = false;
-
-    // Member variables for remembering the current device orientation.
-    private int mDisplayOrientation;
 
     // Object for reacting to adding/removing a dictionary pack.
     private BroadcastReceiver mDictionaryPackInstallReceiver =
             new DictionaryPackInstallBroadcastReceiver(this);
 
-    // Keeps track of most recently inserted text (multi-character key) for reverting
-    private String mEnteredText;
-
-    // TODO: This boolean is persistent state and causes large side effects at unexpected times.
-    // Find a way to remove it for readability.
-    private boolean mIsAutoCorrectionIndicatorOn;
-
     private AlertDialog mOptionsDialog;
 
     private final boolean mIsHardwareAcceleratedDrawingEnabled;
 
     public final UIHandler mHandler = new UIHandler(this);
-    private InputUpdater mInputUpdater;
 
-    public static final class UIHandler extends StaticInnerHandlerWrapper<LatinIME> {
+    public static final class UIHandler extends LeakGuardHandlerWrapper<LatinIME> {
         private static final int MSG_UPDATE_SHIFT_STATE = 0;
         private static final int MSG_PENDING_IMS_CALLBACK = 1;
         private static final int MSG_UPDATE_SUGGESTION_STRIP = 2;
@@ -236,6 +145,8 @@
         private static final int MSG_REOPEN_DICTIONARIES = 5;
         private static final int MSG_ON_END_BATCH_INPUT = 6;
         private static final int MSG_RESET_CACHES = 7;
+        // Update this when adding new messages
+        private static final int MSG_LAST = MSG_RESET_CACHES;
 
         private static final int ARG1_NOT_GESTURE_INPUT = 0;
         private static final int ARG1_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
@@ -248,12 +159,12 @@
         private long mDoubleSpacePeriodTimeout;
         private long mDoubleSpacePeriodTimerStart;
 
-        public UIHandler(final LatinIME outerInstance) {
-            super(outerInstance);
+        public UIHandler(final LatinIME ownerInstance) {
+            super(ownerInstance);
         }
 
         public void onCreate() {
-            final Resources res = getOuterInstance().getResources();
+            final Resources res = getOwnerInstance().getResources();
             mDelayUpdateSuggestions =
                     res.getInteger(R.integer.config_delay_update_suggestions);
             mDelayUpdateShiftState =
@@ -264,11 +175,12 @@
 
         @Override
         public void handleMessage(final Message msg) {
-            final LatinIME latinIme = getOuterInstance();
+            final LatinIME latinIme = getOwnerInstance();
             final KeyboardSwitcher switcher = latinIme.mKeyboardSwitcher;
             switch (msg.what) {
             case MSG_UPDATE_SUGGESTION_STRIP:
-                latinIme.updateSuggestionStrip();
+                latinIme.mInputLogic.performUpdateSuggestionStripSync(
+                        latinIme.mSettings.getCurrent(), this /* handler */);
                 break;
             case MSG_UPDATE_SHIFT_STATE:
                 switcher.updateShiftState();
@@ -288,7 +200,9 @@
                 }
                 break;
             case MSG_RESUME_SUGGESTIONS:
-                latinIme.restartSuggestionsOnWordTouchedByCursor();
+                latinIme.mInputLogic.restartSuggestionsOnWordTouchedByCursor(
+                        latinIme.mSettings.getCurrent(), 0 /* offset */,
+                        false /* includeResumedWordInSuggestions */, latinIme.mKeyboardSwitcher);
                 break;
             case MSG_REOPEN_DICTIONARIES:
                 latinIme.initSuggest();
@@ -298,11 +212,14 @@
                 postUpdateSuggestionStrip();
                 break;
             case MSG_ON_END_BATCH_INPUT:
-                latinIme.onEndBatchInputAsyncInternal((SuggestedWords) msg.obj);
+                latinIme.mInputLogic.endBatchInputAsyncInternal(latinIme.mSettings.getCurrent(),
+                        (SuggestedWords) msg.obj, latinIme.mKeyboardSwitcher);
                 break;
             case MSG_RESET_CACHES:
-                latinIme.retryResetCaches(msg.arg1 == 1 /* tryResumeSuggestions */,
-                        msg.arg2 /* remainingTries */);
+                latinIme.mInputLogic.retryResetCaches(latinIme.mSettings.getCurrent(),
+                        msg.arg1 == 1 /* tryResumeSuggestions */,
+                        msg.arg2 /* remainingTries */,
+                        latinIme.mKeyboardSwitcher, this);
                 break;
             }
         }
@@ -347,6 +264,13 @@
             removeMessages(MSG_UPDATE_SHIFT_STATE);
         }
 
+        @UsedForTesting
+        public void removeAllMessages() {
+            for (int i = 0; i <= MSG_LAST; ++i) {
+                removeMessages(i);
+            }
+        }
+
         public void showGesturePreviewAndSuggestionStrip(final SuggestedWords suggestedWords,
                 final boolean dismissGestureFloatingPreviewText) {
             removeMessages(MSG_SHOW_GESTURE_PREVIEW_AND_SUGGESTION_STRIP);
@@ -401,7 +325,7 @@
             removeMessages(MSG_PENDING_IMS_CALLBACK);
             resetPendingImsCallback();
             mIsOrientationChanging = true;
-            final LatinIME latinIme = getOuterInstance();
+            final LatinIME latinIme = getOwnerInstance();
             if (latinIme.isInputViewShown()) {
                 latinIme.mKeyboardSwitcher.saveKeyboardState();
             }
@@ -434,7 +358,7 @@
                     mIsOrientationChanging = false;
                     mPendingSuccessiveImsCallback = true;
                 }
-                final LatinIME latinIme = getOuterInstance();
+                final LatinIME latinIme = getOwnerInstance();
                 executePendingImsCallback(latinIme, editorInfo, restarting);
                 latinIme.onStartInputInternal(editorInfo, restarting);
             }
@@ -453,7 +377,7 @@
                     sendMessageDelayed(obtainMessage(MSG_PENDING_IMS_CALLBACK),
                             PENDING_IMS_CALLBACK_DURATION);
                 }
-                final LatinIME latinIme = getOuterInstance();
+                final LatinIME latinIme = getOwnerInstance();
                 executePendingImsCallback(latinIme, editorInfo, restarting);
                 latinIme.onStartInputViewInternal(editorInfo, restarting);
                 mAppliedEditorInfo = editorInfo;
@@ -465,7 +389,7 @@
                 // Typically this is the first onFinishInputView after orientation changed.
                 mHasPendingFinishInputView = true;
             } else {
-                final LatinIME latinIme = getOuterInstance();
+                final LatinIME latinIme = getOwnerInstance();
                 latinIme.onFinishInputViewInternal(finishingInput);
                 mAppliedEditorInfo = null;
             }
@@ -476,7 +400,7 @@
                 // Typically this is the first onFinishInput after orientation changed.
                 mHasPendingFinishInput = true;
             } else {
-                final LatinIME latinIme = getOuterInstance();
+                final LatinIME latinIme = getOwnerInstance();
                 executePendingImsCallback(latinIme, null, false);
                 latinIme.onFinishInputInternal();
             }
@@ -536,7 +460,6 @@
         KeyboardSwitcher.init(this);
         AudioAndHapticFeedbackManager.init(this);
         AccessibilityUtils.init(this);
-        PersonalizationDictionarySessionRegister.init(this);
 
         super.onCreate();
 
@@ -548,9 +471,8 @@
         initSuggest();
 
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.getInstance().init(this, mKeyboardSwitcher, mSuggest);
+            ResearchLogger.getInstance().init(this, mKeyboardSwitcher);
         }
-        mDisplayOrientation = getResources().getConfiguration().orientation;
 
         // Register to receive ringer mode change and network state change.
         // Also receive installation and removal of a dictionary pack.
@@ -570,17 +492,15 @@
         registerReceiver(mDictionaryPackInstallReceiver, newDictFilter);
 
         DictionaryDecayBroadcastReciever.setUpIntervalAlarmForDictionaryDecaying(this);
-
-        mInputUpdater = new InputUpdater(this);
     }
 
     // Has to be package-visible for unit tests
     @UsedForTesting
     void loadSettings() {
         final Locale locale = mSubtypeSwitcher.getCurrentSubtypeLocale();
-        final InputAttributes inputAttributes =
-                new InputAttributes(getCurrentInputEditorInfo(), isFullscreenMode());
-        mSettings.loadSettings(locale, inputAttributes);
+        final EditorInfo editorInfo = getCurrentInputEditorInfo();
+        final InputAttributes inputAttributes = new InputAttributes(editorInfo, isFullscreenMode());
+        mSettings.loadSettings(this, locale, inputAttributes);
         AudioAndHapticFeedbackManager.getInstance().onSettingsChanged(mSettings.getCurrent());
         // To load the keyboard we need to load all the settings once, but resetting the
         // contacts dictionary should be deferred until after the new layout has been displayed
@@ -589,16 +509,34 @@
         // the layout; at this time, we need to skip resetting the contacts dictionary. It will
         // be done later inside {@see #initSuggest()} when the reopenDictionaries message is
         // processed.
-        if (!mHandler.hasPendingReopenDictionaries()) {
-            // May need to reset the contacts dictionary depending on the user settings.
-            resetContactsDictionary(null == mSuggest ? null : mSuggest.getContactsDictionary());
+        final SettingsValues currentSettingsValues = mSettings.getCurrent();
+        final Suggest suggest = mInputLogic.mSuggest;
+        if (!mHandler.hasPendingReopenDictionaries() && suggest != null) {
+            // May need to reset dictionaries depending on the user settings.
+            final DictionaryFacilitatorForSuggest oldDictionaryFacilitator =
+                    suggest.mDictionaryFacilitator;
+            final DictionaryFacilitatorForSuggest dictionaryFacilitator =
+                    new DictionaryFacilitatorForSuggest(currentSettingsValues,
+                            oldDictionaryFacilitator);
+            // Create Suggest instance with the new dictionary facilitator.
+            mInputLogic.mSuggest = new Suggest(suggest /* oldSuggest */, dictionaryFacilitator);
+            suggest.close();
+        }
+        if (currentSettingsValues.mUsePersonalizedDicts) {
+            if (mSubtypeSwitcher.isSystemLocaleSameAsLocaleOfAllEnabledSubtypes()) {
+                PersonalizationDictionarySessionRegistrar.init(this);
+            } else {
+                PersonalizationDictionarySessionRegistrar.close(this);
+            }
+        } else {
+            PersonalizationHelper.removeAllPersonalizedDictionaries(this);
+            PersonalizationDictionarySessionRegistrar.resetAll(this);
         }
     }
 
     // Note that this method is called from a non-UI thread.
     @Override
     public void onUpdateMainDictionaryAvailability(final boolean isMainDictionaryAvailable) {
-        mIsMainDictionaryAvailable = isMainDictionaryAvailable;
         final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
         if (mainKeyboardView != null) {
             mainKeyboardView.setMainDictionaryAvailability(isMainDictionaryAvailable);
@@ -609,7 +547,6 @@
         final Locale switcherSubtypeLocale = mSubtypeSwitcher.getCurrentSubtypeLocale();
         final String switcherLocaleStr = switcherSubtypeLocale.toString();
         final Locale subtypeLocale;
-        final String localeStr;
         if (TextUtils.isEmpty(switcherLocaleStr)) {
             // This happens in very rare corner cases - for example, immediately after a switch
             // to LatinIME has been requested, about a frame later another switch happens. In this
@@ -619,101 +556,42 @@
             // of knowing anyway.
             Log.e(TAG, "System is reporting no current subtype.");
             subtypeLocale = getResources().getConfiguration().locale;
-            localeStr = subtypeLocale.toString();
         } else {
             subtypeLocale = switcherSubtypeLocale;
-            localeStr = switcherLocaleStr;
         }
 
-        final Suggest newSuggest = new Suggest(this /* Context */, subtypeLocale,
-                this /* SuggestInitializationListener */);
         final SettingsValues settingsValues = mSettings.getCurrent();
+        final DictionaryFacilitatorForSuggest oldDictionaryFacilitator =
+                (mInputLogic.mSuggest == null) ? null : mInputLogic.mSuggest.mDictionaryFacilitator;
+        // Creates new dictionary facilitator for the new locale.
+        final DictionaryFacilitatorForSuggest dictionaryFacilitator =
+                new DictionaryFacilitatorForSuggest(this /* context */, subtypeLocale,
+                        settingsValues, this /* DictionaryInitializationListener */,
+                        oldDictionaryFacilitator);
+        final Suggest newSuggest = new Suggest(subtypeLocale, dictionaryFacilitator);
         if (settingsValues.mCorrectionEnabled) {
             newSuggest.setAutoCorrectionThreshold(settingsValues.mAutoCorrectionThreshold);
         }
-
-        mIsMainDictionaryAvailable = DictionaryFactory.isDictionaryAvailable(this, subtypeLocale);
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.getInstance().initSuggest(newSuggest);
+            ResearchLogger.getInstance().initDictionary(newSuggest.mDictionaryFacilitator);
         }
-
-        mUserDictionary = new UserBinaryDictionary(this, localeStr);
-        mIsUserDictionaryAvailable = mUserDictionary.isEnabled();
-        newSuggest.setUserDictionary(mUserDictionary);
-
-        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
-
-        mUserHistoryDictionary = PersonalizationHelper.getUserHistoryDictionary(
-                this, localeStr, prefs);
-        newSuggest.setUserHistoryDictionary(mUserHistoryDictionary);
-        mPersonalizationDictionary = PersonalizationHelper
-                .getPersonalizationDictionary(this, localeStr, prefs);
-        newSuggest.setPersonalizationDictionary(mPersonalizationDictionary);
-        mPersonalizationPredictionDictionary = PersonalizationHelper
-                .getPersonalizationPredictionDictionary(this, localeStr, prefs);
-        newSuggest.setPersonalizationPredictionDictionary(mPersonalizationPredictionDictionary);
-
-        final Suggest oldSuggest = mSuggest;
-        resetContactsDictionary(null != oldSuggest ? oldSuggest.getContactsDictionary() : null);
-        mSuggest = newSuggest;
+        final Suggest oldSuggest = mInputLogic.mSuggest;
+        mInputLogic.mSuggest = newSuggest;
         if (oldSuggest != null) oldSuggest.close();
     }
 
-    /**
-     * Resets the contacts dictionary in mSuggest according to the user settings.
-     *
-     * This method takes an optional contacts dictionary to use when the locale hasn't changed
-     * since the contacts dictionary can be opened or closed as necessary depending on the settings.
-     *
-     * @param oldContactsDictionary an optional dictionary to use, or null
-     */
-    private void resetContactsDictionary(final ContactsBinaryDictionary oldContactsDictionary) {
-        final Suggest suggest = mSuggest;
-        final boolean shouldSetDictionary =
-                (null != suggest && mSettings.getCurrent().mUseContactsDict);
-
-        final ContactsBinaryDictionary dictionaryToUse;
-        if (!shouldSetDictionary) {
-            // Make sure the dictionary is closed. If it is already closed, this is a no-op,
-            // so it's safe to call it anyways.
-            if (null != oldContactsDictionary) oldContactsDictionary.close();
-            dictionaryToUse = null;
-        } else {
-            final Locale locale = mSubtypeSwitcher.getCurrentSubtypeLocale();
-            if (null != oldContactsDictionary) {
-                if (!oldContactsDictionary.mLocale.equals(locale)) {
-                    // If the locale has changed then recreate the contacts dictionary. This
-                    // allows locale dependent rules for handling bigram name predictions.
-                    oldContactsDictionary.close();
-                    dictionaryToUse = new ContactsBinaryDictionary(this, locale);
-                } else {
-                    // Make sure the old contacts dictionary is opened. If it is already open,
-                    // this is a no-op, so it's safe to call it anyways.
-                    oldContactsDictionary.reopen(this);
-                    dictionaryToUse = oldContactsDictionary;
-                }
-            } else {
-                dictionaryToUse = new ContactsBinaryDictionary(this, locale);
-            }
-        }
-
-        if (null != suggest) {
-            suggest.setContactsDictionary(dictionaryToUse);
-        }
-    }
-
     /* package private */ void resetSuggestMainDict() {
         final Locale subtypeLocale = mSubtypeSwitcher.getCurrentSubtypeLocale();
-        mSuggest.resetMainDict(this, subtypeLocale, this /* SuggestInitializationListener */);
-        mIsMainDictionaryAvailable = DictionaryFactory.isDictionaryAvailable(this, subtypeLocale);
+        mInputLogic.mSuggest.mDictionaryFacilitator.reloadMainDict(this, subtypeLocale,
+                this /* SuggestInitializationListener */);
     }
 
     @Override
     public void onDestroy() {
-        final Suggest suggest = mSuggest;
+        final Suggest suggest = mInputLogic.mSuggest;
         if (suggest != null) {
             suggest.close();
-            mSuggest = null;
+            mInputLogic.mSuggest = null;
         }
         mSettings.onDestroy();
         unregisterReceiver(mReceiver);
@@ -721,30 +599,27 @@
             ResearchLogger.getInstance().onDestroy();
         }
         unregisterReceiver(mDictionaryPackInstallReceiver);
-        PersonalizationDictionarySessionRegister.onDestroy(this);
+        PersonalizationDictionarySessionRegistrar.close(this);
         LatinImeLogger.commit();
         LatinImeLogger.onDestroy();
-        if (mInputUpdater != null) {
-            mInputUpdater.quitLooper();
-        }
         super.onDestroy();
     }
 
     @Override
     public void onConfigurationChanged(final Configuration conf) {
         // If orientation changed while predicting, commit the change
-        if (mDisplayOrientation != conf.orientation) {
-            mDisplayOrientation = conf.orientation;
+        final SettingsValues settingsValues = mSettings.getCurrent();
+        if (settingsValues.mDisplayOrientation != conf.orientation) {
             mHandler.startOrientationChanging();
-            mConnection.beginBatchEdit();
-            commitTyped(LastComposedWord.NOT_A_SEPARATOR);
-            mConnection.finishComposingText();
-            mConnection.endBatchEdit();
+            mInputLogic.mConnection.beginBatchEdit();
+            mInputLogic.commitTyped(mSettings.getCurrent(), LastComposedWord.NOT_A_SEPARATOR);
+            mInputLogic.mConnection.finishComposingText();
+            mInputLogic.mConnection.endBatchEdit();
             if (isShowingOptionDialog()) {
                 mOptionsDialog.dismiss();
             }
         }
-        PersonalizationDictionarySessionRegister.onConfigurationChanged(this, conf);
+        PersonalizationDictionarySessionRegistrar.onConfigurationChanged(this, conf);
         super.onConfigurationChanged(conf);
     }
 
@@ -760,8 +635,9 @@
                 .findViewById(android.R.id.extractArea);
         mKeyPreviewBackingView = view.findViewById(R.id.key_preview_backing);
         mSuggestionStripView = (SuggestionStripView)view.findViewById(R.id.suggestion_strip_view);
-        if (mSuggestionStripView != null)
+        if (mSuggestionStripView != null) {
             mSuggestionStripView.setListener(this, view);
+        }
         if (LatinImeLogger.sVISUALDEBUG) {
             mKeyPreviewBackingView.setBackgroundColor(0x10FF0000);
         }
@@ -849,14 +725,6 @@
             Log.w(TAG, "Use EditorInfo.IME_FLAG_FORCE_ASCII flag instead");
         }
 
-        final PackageInfo packageInfo =
-                TargetPackageInfoGetterTask.getCachedPackageInfo(editorInfo.packageName);
-        mAppWorkAroundsUtils.setPackageInfo(packageInfo);
-        if (null == packageInfo) {
-            new TargetPackageInfoGetterTask(this /* context */, this /* listener */)
-                    .execute(editorInfo.packageName);
-        }
-
         LatinImeLogger.onStartInputView(editorInfo);
         // In landscape mode, this method gets called without the input view being created.
         if (mainKeyboardView == null) {
@@ -882,16 +750,11 @@
 
         // The app calling setText() has the effect of clearing the composing
         // span, so we should reset our state unconditionally, even if restarting is true.
-        mEnteredText = null;
-        resetComposingState(true /* alsoResetLastComposedWord */);
-        mDeleteCount = 0;
-        mSpaceState = SPACE_STATE_NONE;
-        mRecapitalizeStatus.deactivate();
-        mCurrentlyPressedHardwareKeys.clear();
+        mInputLogic.startInput(restarting, editorInfo);
 
         // Note: the following does a round-trip IPC on the main thread: be careful
         final Locale currentLocale = mSubtypeSwitcher.getCurrentSubtypeLocale();
-        final Suggest suggest = mSuggest;
+        final Suggest suggest = mInputLogic.mSuggest;
         if (null != suggest && null != currentLocale && !currentLocale.equals(suggest.mLocale)) {
             initSuggest();
         }
@@ -900,13 +763,14 @@
             // otherwise it will clear the suggestion strip.
             setPunctuationSuggestions();
         }
-        mSuggestedWords = SuggestedWords.EMPTY;
 
         // Sometimes, while rotating, for some reason the framework tells the app we are not
         // connected to it and that means we can't refresh the cache. In this case, schedule a
         // refresh later.
+        // TODO[IL]: Can the following be moved to InputLogic#startInput?
         final boolean canReachInputConnection;
-        if (!mConnection.resetCachesUponCursorMoveAndReturnSuccess(editorInfo.initialSelStart,
+        if (!mInputLogic.mConnection.resetCachesUponCursorMoveAndReturnSuccess(
+                editorInfo.initialSelStart, editorInfo.initialSelEnd,
                 false /* shouldFinishComposition */)) {
             // We try resetting the caches up to 5 times before giving up.
             mHandler.postResetCaches(isDifferentTextField, 5 /* remainingTries */);
@@ -919,9 +783,12 @@
             canReachInputConnection = true;
         }
 
+        if (isDifferentTextField ||
+                !currentSettingsValues.hasSameOrientation(getResources().getConfiguration())) {
+            loadSettings();
+        }
         if (isDifferentTextField) {
             mainKeyboardView.closing();
-            loadSettings();
             currentSettingsValues = mSettings.getCurrent();
 
             if (suggest != null && currentSettingsValues.mCorrectionEnabled) {
@@ -947,16 +814,11 @@
         setSuggestionStripShownInternal(
                 isSuggestionsStripVisible(), /* needsInputViewShown */ false);
 
-        mLastSelectionStart = editorInfo.initialSelStart;
-        mLastSelectionEnd = editorInfo.initialSelEnd;
-        // In some cases (namely, after rotation of the device) editorInfo.initialSelStart is lying
-        // so we try using some heuristics to find out about these and fix them.
-        tryFixLyingCursorPosition();
-
         mHandler.cancelUpdateSuggestionStrip();
         mHandler.cancelDoubleSpacePeriodTimer();
 
-        mainKeyboardView.setMainDictionaryAvailability(mIsMainDictionaryAvailable);
+        mainKeyboardView.setMainDictionaryAvailability(null != suggest
+                ? suggest.mDictionaryFacilitator.hasMainDictionary() : false);
         mainKeyboardView.setKeyPreviewPopupEnabled(currentSettingsValues.mKeyPreviewPopupOn,
                 currentSettingsValues.mKeyPreviewPopupDismissDelay);
         mainKeyboardView.setSlidingKeyInputPreviewEnabled(
@@ -966,76 +828,9 @@
                 currentSettingsValues.mGestureTrailEnabled,
                 currentSettingsValues.mGestureFloatingPreviewTextEnabled);
 
-        initPersonalizationDebugSettings(currentSettingsValues);
-
         if (TRACE) Debug.startMethodTracing("/data/trace/latinime");
     }
 
-    /**
-     * Try to get the text from the editor to expose lies the framework may have been
-     * telling us. Concretely, when the device rotates, the frameworks tells us about where the
-     * cursor used to be initially in the editor at the time it first received the focus; this
-     * may be completely different from the place it is upon rotation. Since we don't have any
-     * means to get the real value, try at least to ask the text view for some characters and
-     * detect the most damaging cases: when the cursor position is declared to be much smaller
-     * than it really is.
-     */
-    private void tryFixLyingCursorPosition() {
-        final CharSequence textBeforeCursor =
-                mConnection.getTextBeforeCursor(Constants.EDITOR_CONTENTS_CACHE_SIZE, 0);
-        if (null == textBeforeCursor) {
-            mLastSelectionStart = mLastSelectionEnd = NOT_A_CURSOR_POSITION;
-        } else {
-            final int textLength = textBeforeCursor.length();
-            if (textLength > mLastSelectionStart
-                    || (textLength < Constants.EDITOR_CONTENTS_CACHE_SIZE
-                            && mLastSelectionStart < Constants.EDITOR_CONTENTS_CACHE_SIZE)) {
-                // It should not be possible to have only one of those variables be
-                // NOT_A_CURSOR_POSITION, so if they are equal, either the selection is zero-sized
-                // (simple cursor, no selection) or there is no cursor/we don't know its pos
-                final boolean wasEqual = mLastSelectionStart == mLastSelectionEnd;
-                mLastSelectionStart = textLength;
-                // We can't figure out the value of mLastSelectionEnd :(
-                // But at least if it's smaller than mLastSelectionStart something is wrong,
-                // and if they used to be equal we also don't want to make it look like there is a
-                // selection.
-                if (wasEqual || mLastSelectionStart > mLastSelectionEnd) {
-                    mLastSelectionEnd = mLastSelectionStart;
-                }
-            }
-        }
-    }
-
-    // Initialization of personalization debug settings. This must be called inside
-    // onStartInputView.
-    private void initPersonalizationDebugSettings(SettingsValues currentSettingsValues) {
-        if (mUseOnlyPersonalizationDictionaryForDebug
-                != currentSettingsValues.mUseOnlyPersonalizationDictionaryForDebug) {
-            // Only for debug
-            initSuggest();
-            mUseOnlyPersonalizationDictionaryForDebug =
-                    currentSettingsValues.mUseOnlyPersonalizationDictionaryForDebug;
-        }
-
-        if (mBoostPersonalizationDictionaryForDebug !=
-                currentSettingsValues.mBoostPersonalizationDictionaryForDebug) {
-            // Only for debug
-            mBoostPersonalizationDictionaryForDebug =
-                    currentSettingsValues.mBoostPersonalizationDictionaryForDebug;
-            if (mBoostPersonalizationDictionaryForDebug) {
-                UserHistoryForgettingCurveUtils.boostMaxFreqForDebug();
-            } else {
-                UserHistoryForgettingCurveUtils.resetMaxFreqForDebug();
-            }
-        }
-    }
-
-    // Callback for the TargetPackageInfoGetterTask
-    @Override
-    public void onTargetPackageInfoKnown(final PackageInfo info) {
-        mAppWorkAroundsUtils.setPackageInfo(info);
-    }
-
     @Override
     public void onWindowHidden() {
         super.onWindowHidden();
@@ -1062,12 +857,12 @@
         // Remove pending messages related to update suggestions
         mHandler.cancelUpdateSuggestionStrip();
         // Should do the following in onFinishInputInternal but until JB MR2 it's not called :(
-        if (mWordComposer.isComposingWord()) mConnection.finishComposingText();
-        resetComposingState(true /* alsoResetLastComposedWord */);
+        mInputLogic.finishInput();
         // Notify ResearchLogger
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.latinIME_onFinishInputViewInternal(finishingInput, mLastSelectionStart,
-                    mLastSelectionEnd, getCurrentInputConnection());
+            ResearchLogger.latinIME_onFinishInputViewInternal(finishingInput,
+                    mInputLogic.mLastSelectionStart,
+                    mInputLogic.mLastSelectionEnd, getCurrentInputConnection());
         }
     }
 
@@ -1080,28 +875,22 @@
         if (DEBUG) {
             Log.i(TAG, "onUpdateSelection: oss=" + oldSelStart
                     + ", ose=" + oldSelEnd
-                    + ", lss=" + mLastSelectionStart
-                    + ", lse=" + mLastSelectionEnd
+                    + ", lss=" + mInputLogic.mLastSelectionStart
+                    + ", lse=" + mInputLogic.mLastSelectionEnd
                     + ", nss=" + newSelStart
                     + ", nse=" + newSelEnd
                     + ", cs=" + composingSpanStart
                     + ", ce=" + composingSpanEnd);
         }
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            final boolean expectingUpdateSelectionFromLogger =
-                    ResearchLogger.getAndClearLatinIMEExpectingUpdateSelection();
-            ResearchLogger.latinIME_onUpdateSelection(mLastSelectionStart, mLastSelectionEnd,
+            ResearchLogger.latinIME_onUpdateSelection(mInputLogic.mLastSelectionStart,
+                    mInputLogic.mLastSelectionEnd,
                     oldSelStart, oldSelEnd, newSelStart, newSelEnd, composingSpanStart,
-                    composingSpanEnd, mExpectingUpdateSelection,
-                    expectingUpdateSelectionFromLogger, mConnection);
-            if (expectingUpdateSelectionFromLogger) {
-                // TODO: Investigate. Quitting now sounds wrong - we won't do the resetting work
-                return;
-            }
+                    composingSpanEnd, mInputLogic.mConnection);
         }
 
-        final boolean selectionChanged = mLastSelectionStart != newSelStart
-                || mLastSelectionEnd != newSelEnd;
+        final boolean selectionChanged = mInputLogic.mLastSelectionStart != newSelStart
+                || mInputLogic.mLastSelectionEnd != newSelEnd;
 
         // if composingSpanStart and composingSpanEnd are -1, it means there is no composing
         // span in the view - we can use that to narrow down whether the cursor was moved
@@ -1116,30 +905,25 @@
         // TODO: revisit this when LatinIME supports hardware keyboards.
         // NOTE: the test harness subclasses LatinIME and overrides isInputViewShown().
         // TODO: find a better way to simulate actual execution.
-        if (isInputViewShown() && !mExpectingUpdateSelection
-                && !mConnection.isBelatedExpectedUpdate(oldSelStart, newSelStart)) {
-            // TAKE CARE: there is a race condition when we enter this test even when the user
-            // did not explicitly move the cursor. This happens when typing fast, where two keys
-            // turn this flag on in succession and both onUpdateSelection() calls arrive after
-            // the second one - the first call successfully avoids this test, but the second one
-            // enters. For the moment we rely on noComposingSpan to further reduce the impact.
-
+        if (isInputViewShown() && !mInputLogic.mConnection.isBelatedExpectedUpdate(oldSelStart,
+                newSelStart, oldSelEnd, newSelEnd)) {
             // TODO: the following is probably better done in resetEntireInputState().
             // it should only happen when the cursor moved, and the very purpose of the
             // test below is to narrow down whether this happened or not. Likewise with
             // the call to updateShiftState.
             // We set this to NONE because after a cursor move, we don't want the space
             // state-related special processing to kick in.
-            mSpaceState = SPACE_STATE_NONE;
+            mInputLogic.mSpaceState = SpaceState.NONE;
 
             // TODO: is it still necessary to test for composingSpan related stuff?
             final boolean selectionChangedOrSafeToReset = selectionChanged
-                    || (!mWordComposer.isComposingWord()) || noComposingSpan;
+                    || (!mInputLogic.mWordComposer.isComposingWord()) || noComposingSpan;
             final boolean hasOrHadSelection = (oldSelStart != oldSelEnd
                     || newSelStart != newSelEnd);
             final int moveAmount = newSelStart - oldSelStart;
             if (selectionChangedOrSafeToReset && (hasOrHadSelection
-                    || !mWordComposer.moveCursorByAndReturnIfInsideComposingWord(moveAmount))) {
+                    || !mInputLogic.mWordComposer.moveCursorByAndReturnIfInsideComposingWord(
+                            moveAmount))) {
                 // If we are composing a word and moving the cursor, we would want to set a
                 // suggestion span for recorrection to work correctly. Unfortunately, that
                 // would involve the keyboard committing some new text, which would move the
@@ -1149,14 +933,14 @@
                 // Another option would be to send suggestions each time we set the composing
                 // text, but that is probably too expensive to do, so we decided to leave things
                 // as is.
-                resetEntireInputState(newSelStart);
+                mInputLogic.resetEntireInputState(mSettings.getCurrent(), newSelStart, newSelEnd);
             } else {
-                // resetEntireInputState calls resetCachesUponCursorMove, but with the second
-                // argument as true. But in all cases where we don't reset the entire input state,
-                // we still want to tell the rich input connection about the new cursor position so
-                // that it can update its caches.
-                mConnection.resetCachesUponCursorMoveAndReturnSuccess(newSelStart,
-                        false /* shouldFinishComposition */);
+                // resetEntireInputState calls resetCachesUponCursorMove, but forcing the
+                // composition to end.  But in all cases where we don't reset the entire input
+                // state, we still want to tell the rich input connection about the new cursor
+                // position so that it can update its caches.
+                mInputLogic.mConnection.resetCachesUponCursorMoveAndReturnSuccess(
+                        newSelStart, newSelEnd, false /* shouldFinishComposition */);
             }
 
             // We moved the cursor. If we are touching a word, we need to resume suggestion,
@@ -1165,14 +949,13 @@
                 mHandler.postResumeSuggestions();
             }
             // Reset the last recapitalization.
-            mRecapitalizeStatus.deactivate();
+            mInputLogic.mRecapitalizeStatus.deactivate();
             mKeyboardSwitcher.updateShiftState();
         }
-        mExpectingUpdateSelection = false;
 
         // Make a note of the cursor position
-        mLastSelectionStart = newSelStart;
-        mLastSelectionEnd = newSelEnd;
+        mInputLogic.mLastSelectionStart = newSelStart;
+        mInputLogic.mLastSelectionEnd = newSelEnd;
         mSubtypeState.currentSubtypeUsed();
     }
 
@@ -1186,7 +969,9 @@
      */
     @Override
     public void onExtractedTextClicked() {
-        if (mSettings.getCurrent().isSuggestionsRequested(mDisplayOrientation)) return;
+        if (mSettings.getCurrent().isSuggestionsRequested()) {
+            return;
+        }
 
         super.onExtractedTextClicked();
     }
@@ -1202,7 +987,9 @@
      */
     @Override
     public void onExtractedCursorMovement(final int dx, final int dy) {
-        if (mSettings.getCurrent().isSuggestionsRequested(mDisplayOrientation)) return;
+        if (mSettings.getCurrent().isSuggestionsRequested()) {
+            return;
+        }
 
         super.onExtractedCursorMovement(dx, dy);
     }
@@ -1256,9 +1043,8 @@
                 false /* isObsoleteSuggestions */,
                 false /* isPrediction */);
         // When in fullscreen mode, show completions generated by the application
-        final boolean isAutoCorrection = false;
-        setSuggestedWords(suggestedWords, isAutoCorrection);
-        setAutoCorrectionIndicator(isAutoCorrection);
+        setSuggestedWords(suggestedWords);
+        setAutoCorrectionIndicator(false);
         setSuggestionStripShown(true);
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
             ResearchLogger.latinIME_onDisplayCompletions(applicationSpecifiedCompletions);
@@ -1353,9 +1139,8 @@
 
     @Override
     public boolean onEvaluateFullscreenMode() {
-        // Reread resource value here, because this method is called by framework anytime as needed.
-        final boolean isFullscreenModeAllowed =
-                Settings.readUseFullscreenMode(getResources());
+        // Reread resource value here, because this method is called by the framework as needed.
+        final boolean isFullscreenModeAllowed = Settings.readUseFullscreenMode(getResources());
         if (super.onEvaluateFullscreenMode() && isFullscreenModeAllowed) {
             // TODO: Remove this hack. Actually we should not really assume NO_EXTRACT_UI
             // implies NO_FULLSCREEN. However, the framework mistakenly does.  i.e. NO_EXTRACT_UI
@@ -1378,138 +1163,22 @@
         mKeyPreviewBackingView.setVisibility(isFullscreenMode() ? View.GONE : View.VISIBLE);
     }
 
-    // This will reset the whole input state to the starting state. It will clear
-    // the composing word, reset the last composed word, tell the inputconnection about it.
-    private void resetEntireInputState(final int newCursorPosition) {
-        final boolean shouldFinishComposition = mWordComposer.isComposingWord();
-        resetComposingState(true /* alsoResetLastComposedWord */);
-        final SettingsValues settingsValues = mSettings.getCurrent();
-        if (settingsValues.mBigramPredictionEnabled) {
-            clearSuggestionStrip();
-        } else {
-            setSuggestedWords(settingsValues.mSuggestPuncList, false);
-        }
-        mConnection.resetCachesUponCursorMoveAndReturnSuccess(newCursorPosition,
-                shouldFinishComposition);
-    }
-
-    private void resetComposingState(final boolean alsoResetLastComposedWord) {
-        mWordComposer.reset();
-        if (alsoResetLastComposedWord)
-            mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
-    }
-
-    private void commitTyped(final String separatorString) {
-        if (!mWordComposer.isComposingWord()) return;
-        final String typedWord = mWordComposer.getTypedWord();
-        if (typedWord.length() > 0) {
-            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                ResearchLogger.getInstance().onWordFinished(typedWord, mWordComposer.isBatchMode());
-            }
-            commitChosenWord(typedWord, LastComposedWord.COMMIT_TYPE_USER_TYPED_WORD,
-                    separatorString);
-        }
-    }
-
     // Called from the KeyboardSwitcher which needs to know auto caps state to display
     // the right layout.
+    // TODO[IL]: Remove this, pass the input logic to the keyboard switcher instead?
     public int getCurrentAutoCapsState() {
-        final SettingsValues currentSettingsValues = mSettings.getCurrent();
-        if (!currentSettingsValues.mAutoCap) return Constants.TextUtils.CAP_MODE_OFF;
-
-        final EditorInfo ei = getCurrentInputEditorInfo();
-        if (ei == null) return Constants.TextUtils.CAP_MODE_OFF;
-        final int inputType = ei.inputType;
-        // Warning: this depends on mSpaceState, which may not be the most current value. If
-        // mSpaceState gets updated later, whoever called this may need to be told about it.
-        return mConnection.getCursorCapsMode(inputType, currentSettingsValues,
-                SPACE_STATE_PHANTOM == mSpaceState);
+        return mInputLogic.getCurrentAutoCapsState(null /* optionalSettingsValues */);
     }
 
+    // Called from the KeyboardSwitcher which needs to know recaps state to display
+    // the right layout.
+    // TODO[IL]: Remove this, pass the input logic to the keyboard switcher instead?
     public int getCurrentRecapitalizeState() {
-        if (!mRecapitalizeStatus.isActive()
-                || !mRecapitalizeStatus.isSetAt(mLastSelectionStart, mLastSelectionEnd)) {
-            // Not recapitalizing at the moment
-            return RecapitalizeStatus.NOT_A_RECAPITALIZE_MODE;
-        }
-        return mRecapitalizeStatus.getCurrentMode();
+        return mInputLogic.getCurrentRecapitalizeState();
     }
 
-    // Factor in auto-caps and manual caps and compute the current caps mode.
-    private int getActualCapsMode() {
-        final int keyboardShiftMode = mKeyboardSwitcher.getKeyboardShiftMode();
-        if (keyboardShiftMode != WordComposer.CAPS_MODE_AUTO_SHIFTED) return keyboardShiftMode;
-        final int auto = getCurrentAutoCapsState();
-        if (0 != (auto & TextUtils.CAP_MODE_CHARACTERS)) {
-            return WordComposer.CAPS_MODE_AUTO_SHIFT_LOCKED;
-        }
-        if (0 != auto) return WordComposer.CAPS_MODE_AUTO_SHIFTED;
-        return WordComposer.CAPS_MODE_OFF;
-    }
-
-    private void swapSwapperAndSpace() {
-        final CharSequence lastTwo = mConnection.getTextBeforeCursor(2, 0);
-        // It is guaranteed lastTwo.charAt(1) is a swapper - else this method is not called.
-        if (lastTwo != null && lastTwo.length() == 2
-                && lastTwo.charAt(0) == Constants.CODE_SPACE) {
-            mConnection.deleteSurroundingText(2, 0);
-            final String text = lastTwo.charAt(1) + " ";
-            mConnection.commitText(text, 1);
-            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                ResearchLogger.latinIME_swapSwapperAndSpace(lastTwo, text);
-            }
-            mKeyboardSwitcher.updateShiftState();
-        }
-    }
-
-    private boolean maybeDoubleSpacePeriod() {
-        final SettingsValues currentSettingsValues = mSettings.getCurrent();
-        if (!currentSettingsValues.mUseDoubleSpacePeriod) return false;
-        if (!mHandler.isAcceptingDoubleSpacePeriod()) return false;
-        // We only do this when we see two spaces and an accepted code point before the cursor.
-        // The code point may be a surrogate pair but the two spaces may not, so we need 4 chars.
-        final CharSequence lastThree = mConnection.getTextBeforeCursor(4, 0);
-        if (null == lastThree) return false;
-        final int length = lastThree.length();
-        if (length < 3) return false;
-        if (lastThree.charAt(length - 1) != Constants.CODE_SPACE) return false;
-        if (lastThree.charAt(length - 2) != Constants.CODE_SPACE) return false;
-        // We know there are spaces in pos -1 and -2, and we have at least three chars.
-        // If we have only three chars, isSurrogatePairs can't return true as charAt(1) is a space,
-        // so this is fine.
-        final int firstCodePoint =
-                Character.isSurrogatePair(lastThree.charAt(0), lastThree.charAt(1)) ?
-                        Character.codePointAt(lastThree, 0) : lastThree.charAt(length - 3);
-        if (canBeFollowedByDoubleSpacePeriod(firstCodePoint)) {
-            mHandler.cancelDoubleSpacePeriodTimer();
-            mConnection.deleteSurroundingText(2, 0);
-            final String textToInsert = new String(
-                    new int[] { currentSettingsValues.mSentenceSeparator, Constants.CODE_SPACE },
-                    0, 2);
-            mConnection.commitText(textToInsert, 1);
-            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                ResearchLogger.latinIME_maybeDoubleSpacePeriod(textToInsert,
-                        false /* isBatchMode */);
-            }
-            mKeyboardSwitcher.updateShiftState();
-            return true;
-        }
-        return false;
-    }
-
-    private static boolean canBeFollowedByDoubleSpacePeriod(final int codePoint) {
-        // TODO: Check again whether there really ain't a better way to check this.
-        // TODO: This should probably be language-dependant...
-        return Character.isLetterOrDigit(codePoint)
-                || codePoint == Constants.CODE_SINGLE_QUOTE
-                || codePoint == Constants.CODE_DOUBLE_QUOTE
-                || codePoint == Constants.CODE_CLOSING_PARENTHESIS
-                || codePoint == Constants.CODE_CLOSING_SQUARE_BRACKET
-                || codePoint == Constants.CODE_CLOSING_CURLY_BRACKET
-                || codePoint == Constants.CODE_CLOSING_ANGLE_BRACKET
-                || codePoint == Constants.CODE_PLUS
-                || codePoint == Constants.CODE_PERCENT
-                || Character.getType(codePoint) == Character.OTHER_SYMBOL;
+    public Locale getCurrentSubtypeLocale() {
+        return mSubtypeSwitcher.getCurrentSubtypeLocale();
     }
 
     // Callback for the {@link SuggestionStripView}, to call when the "add to dictionary" hint is
@@ -1521,15 +1190,15 @@
             return;
         }
         final String wordToEdit;
-        if (CapsModeUtils.isAutoCapsMode(mLastComposedWord.mCapitalizedMode)) {
-            wordToEdit = word.toLowerCase(mSubtypeSwitcher.getCurrentSubtypeLocale());
+        if (CapsModeUtils.isAutoCapsMode(mInputLogic.mLastComposedWord.mCapitalizedMode)) {
+            wordToEdit = word.toLowerCase(getCurrentSubtypeLocale());
         } else {
             wordToEdit = word;
         }
-        mUserDictionary.addWordToUserDictionary(wordToEdit);
+        mInputLogic.mSuggest.mDictionaryFacilitator.addWordToUserDictionary(wordToEdit);
     }
 
-    private void onSettingsKeyPressed() {
+    public void displaySettingsDialog() {
         if (isShowingOptionDialog()) return;
         showSubtypeSelectorAndSettings();
     }
@@ -1552,12 +1221,8 @@
         return mOptionsDialog != null && mOptionsDialog.isShowing();
     }
 
-    private void performEditorAction(final int actionId) {
-        mConnection.performEditorAction(actionId);
-    }
-
     // TODO: Revise the language switch key behavior to make it much smarter and more reasonable.
-    private void handleLanguageSwitchKey() {
+    public void switchToNextSubtype() {
         final IBinder token = getWindow().getWindow().getAttributes().token;
         if (mSettings.getCurrent().mIncludesOtherImesInLanguageSwitchList) {
             mRichImm.switchToNextInputMethod(token, false /* onlyCurrentIme */);
@@ -1566,394 +1231,41 @@
         mSubtypeState.switchSubtype(token, mRichImm);
     }
 
-    private void sendDownUpKeyEvent(final int code) {
-        final long eventTime = SystemClock.uptimeMillis();
-        mConnection.sendKeyEvent(new KeyEvent(eventTime, eventTime,
-                KeyEvent.ACTION_DOWN, code, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
-                KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
-        mConnection.sendKeyEvent(new KeyEvent(SystemClock.uptimeMillis(), eventTime,
-                KeyEvent.ACTION_UP, code, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
-                KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
-    }
-
-    private void sendKeyCodePoint(final int code) {
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.latinIME_sendKeyCodePoint(code);
-        }
-        // TODO: Remove this special handling of digit letters.
-        // For backward compatibility. See {@link InputMethodService#sendKeyChar(char)}.
-        if (code >= '0' && code <= '9') {
-            sendDownUpKeyEvent(code - '0' + KeyEvent.KEYCODE_0);
-            return;
-        }
-
-        if (Constants.CODE_ENTER == code && mAppWorkAroundsUtils.isBeforeJellyBean()) {
-            // Backward compatibility mode. Before Jelly bean, the keyboard would simulate
-            // a hardware keyboard event on pressing enter or delete. This is bad for many
-            // reasons (there are race conditions with commits) but some applications are
-            // relying on this behavior so we continue to support it for older apps.
-            sendDownUpKeyEvent(KeyEvent.KEYCODE_ENTER);
-        } else {
-            mConnection.commitText(StringUtils.newSingleCodePointString(code), 1);
-        }
-    }
-
     // Implementation of {@link KeyboardActionListener}.
     @Override
     public void onCodeInput(final int primaryCode, final int x, final int y) {
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.latinIME_onCodeInput(primaryCode, x, y);
-        }
-        final long when = SystemClock.uptimeMillis();
-        if (primaryCode != Constants.CODE_DELETE || when > mLastKeyTime + QUICK_PRESS) {
-            mDeleteCount = 0;
-        }
-        mLastKeyTime = when;
-        mConnection.beginBatchEdit();
-        final KeyboardSwitcher switcher = mKeyboardSwitcher;
-        // The space state depends only on the last character pressed and its own previous
-        // state. Here, we revert the space state to neutral if the key is actually modifying
-        // the input contents (any non-shift key), which is what we should do for
-        // all inputs that do not result in a special state. Each character handling is then
-        // free to override the state as they see fit.
-        final int spaceState = mSpaceState;
-        if (!mWordComposer.isComposingWord()) mIsAutoCorrectionIndicatorOn = false;
-
-        // TODO: Consolidate the double-space period timer, mLastKeyTime, and the space state.
-        if (primaryCode != Constants.CODE_SPACE) {
-            mHandler.cancelDoubleSpacePeriodTimer();
-        }
-
-        boolean didAutoCorrect = false;
-        switch (primaryCode) {
-        case Constants.CODE_DELETE:
-            mSpaceState = SPACE_STATE_NONE;
-            handleBackspace(spaceState);
-            LatinImeLogger.logOnDelete(x, y);
-            break;
-        case Constants.CODE_SHIFT:
-            // Note: Calling back to the keyboard on Shift key is handled in
-            // {@link #onPressKey(int,int,boolean)} and {@link #onReleaseKey(int,boolean)}.
-            final Keyboard currentKeyboard = switcher.getKeyboard();
-            if (null != currentKeyboard && currentKeyboard.mId.isAlphabetKeyboard()) {
-                // TODO: Instead of checking for alphabetic keyboard here, separate keycodes for
-                // alphabetic shift and shift while in symbol layout.
-                handleRecapitalize();
-            }
-            break;
-        case Constants.CODE_CAPSLOCK:
-            // Note: Changing keyboard to shift lock state is handled in
-            // {@link KeyboardSwitcher#onCodeInput(int)}.
-            break;
-        case Constants.CODE_SWITCH_ALPHA_SYMBOL:
-            // Note: Calling back to the keyboard on symbol key is handled in
-            // {@link #onPressKey(int,int,boolean)} and {@link #onReleaseKey(int,boolean)}.
-            break;
-        case Constants.CODE_SETTINGS:
-            onSettingsKeyPressed();
-            break;
-        case Constants.CODE_SHORTCUT:
-            mSubtypeSwitcher.switchToShortcutIME(this);
-            break;
-        case Constants.CODE_ACTION_NEXT:
-            performEditorAction(EditorInfo.IME_ACTION_NEXT);
-            break;
-        case Constants.CODE_ACTION_PREVIOUS:
-            performEditorAction(EditorInfo.IME_ACTION_PREVIOUS);
-            break;
-        case Constants.CODE_LANGUAGE_SWITCH:
-            handleLanguageSwitchKey();
-            break;
-        case Constants.CODE_EMOJI:
-            // Note: Switching emoji keyboard is being handled in
-            // {@link KeyboardState#onCodeInput(int,int)}.
-            break;
-        case Constants.CODE_ENTER:
-            final EditorInfo editorInfo = getCurrentInputEditorInfo();
-            final int imeOptionsActionId =
-                    InputTypeUtils.getImeOptionsActionIdFromEditorInfo(editorInfo);
-            if (InputTypeUtils.IME_ACTION_CUSTOM_LABEL == imeOptionsActionId) {
-                // Either we have an actionLabel and we should performEditorAction with actionId
-                // regardless of its value.
-                performEditorAction(editorInfo.actionId);
-            } else if (EditorInfo.IME_ACTION_NONE != imeOptionsActionId) {
-                // We didn't have an actionLabel, but we had another action to execute.
-                // EditorInfo.IME_ACTION_NONE explicitly means no action. In contrast,
-                // EditorInfo.IME_ACTION_UNSPECIFIED is the default value for an action, so it
-                // means there should be an action and the app didn't bother to set a specific
-                // code for it - presumably it only handles one. It does not have to be treated
-                // in any specific way: anything that is not IME_ACTION_NONE should be sent to
-                // performEditorAction.
-                performEditorAction(imeOptionsActionId);
-            } else {
-                // No action label, and the action from imeOptions is NONE: this is a regular
-                // enter key that should input a carriage return.
-                didAutoCorrect = handleNonSpecialCharacter(Constants.CODE_ENTER, x, y, spaceState);
-            }
-            break;
-        case Constants.CODE_SHIFT_ENTER:
-            didAutoCorrect = handleNonSpecialCharacter(Constants.CODE_ENTER, x, y, spaceState);
-            break;
-        default:
-            didAutoCorrect = handleNonSpecialCharacter(primaryCode, x, y, spaceState);
-            break;
-        }
-        switcher.onCodeInput(primaryCode);
-        // Reset after any single keystroke, except shift, capslock, and symbol-shift
-        if (!didAutoCorrect && primaryCode != Constants.CODE_SHIFT
-                && primaryCode != Constants.CODE_CAPSLOCK
-                && primaryCode != Constants.CODE_SWITCH_ALPHA_SYMBOL)
-            mLastComposedWord.deactivate();
-        if (Constants.CODE_DELETE != primaryCode) {
-            mEnteredText = null;
-        }
-        mConnection.endBatchEdit();
-    }
-
-    private boolean handleNonSpecialCharacter(final int primaryCode, final int x, final int y,
-            final int spaceState) {
-        mSpaceState = SPACE_STATE_NONE;
-        final boolean didAutoCorrect;
-        final SettingsValues settingsValues = mSettings.getCurrent();
-        if (settingsValues.isWordSeparator(primaryCode)
-                || Character.getType(primaryCode) == Character.OTHER_SYMBOL) {
-            didAutoCorrect = handleSeparator(primaryCode, x, y, spaceState);
-        } else {
-            didAutoCorrect = false;
-            if (SPACE_STATE_PHANTOM == spaceState) {
-                if (settingsValues.mIsInternal) {
-                    if (mWordComposer.isComposingWord() && mWordComposer.isBatchMode()) {
-                        LatinImeLoggerUtils.onAutoCorrection(
-                                "", mWordComposer.getTypedWord(), " ", mWordComposer);
-                    }
-                }
-                if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
-                    // If we are in the middle of a recorrection, we need to commit the recorrection
-                    // first so that we can insert the character at the current cursor position.
-                    resetEntireInputState(mLastSelectionStart);
-                } else {
-                    commitTyped(LastComposedWord.NOT_A_SEPARATOR);
-                }
-            }
-            final int keyX, keyY;
-            final Keyboard keyboard = mKeyboardSwitcher.getKeyboard();
-            if (keyboard != null && keyboard.hasProximityCharsCorrection(primaryCode)) {
-                keyX = x;
-                keyY = y;
-            } else {
-                keyX = Constants.NOT_A_COORDINATE;
-                keyY = Constants.NOT_A_COORDINATE;
-            }
-            handleCharacter(primaryCode, keyX, keyY, spaceState);
-        }
-        mExpectingUpdateSelection = true;
-        return didAutoCorrect;
+        mInputLogic.onCodeInput(primaryCode, x, y, mHandler, mKeyboardSwitcher, mSubtypeSwitcher);
     }
 
     // Called from PointerTracker through the KeyboardActionListener interface
     @Override
     public void onTextInput(final String rawText) {
-        mConnection.beginBatchEdit();
-        if (mWordComposer.isComposingWord()) {
-            commitCurrentAutoCorrection(rawText);
-        } else {
-            resetComposingState(true /* alsoResetLastComposedWord */);
-        }
-        mHandler.postUpdateSuggestionStrip();
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS
-                && ResearchLogger.RESEARCH_KEY_OUTPUT_TEXT.equals(rawText)) {
-            ResearchLogger.getInstance().onResearchKeySelected(this);
-            return;
-        }
-        final String text = specificTldProcessingOnTextInput(rawText);
-        if (SPACE_STATE_PHANTOM == mSpaceState) {
-            promotePhantomSpace();
-        }
-        mConnection.commitText(text, 1);
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.latinIME_onTextInput(text, false /* isBatchMode */);
-        }
-        mConnection.endBatchEdit();
-        // Space state must be updated before calling updateShiftState
-        mSpaceState = SPACE_STATE_NONE;
+        mInputLogic.onTextInput(mSettings.getCurrent(), rawText, mHandler);
         mKeyboardSwitcher.updateShiftState();
         mKeyboardSwitcher.onCodeInput(Constants.CODE_OUTPUT_TEXT);
-        mEnteredText = text;
     }
 
     @Override
     public void onStartBatchInput() {
-        mInputUpdater.onStartBatchInput();
-        mHandler.cancelUpdateSuggestionStrip();
-        mConnection.beginBatchEdit();
-        final SettingsValues settingsValues = mSettings.getCurrent();
-        if (mWordComposer.isComposingWord()) {
-            if (settingsValues.mIsInternal) {
-                if (mWordComposer.isBatchMode()) {
-                    LatinImeLoggerUtils.onAutoCorrection(
-                            "", mWordComposer.getTypedWord(), " ", mWordComposer);
-                }
-            }
-            final int wordComposerSize = mWordComposer.size();
-            // Since isComposingWord() is true, the size is at least 1.
-            if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
-                // If we are in the middle of a recorrection, we need to commit the recorrection
-                // first so that we can insert the batch input at the current cursor position.
-                resetEntireInputState(mLastSelectionStart);
-            } else if (wordComposerSize <= 1) {
-                // We auto-correct the previous (typed, not gestured) string iff it's one character
-                // long. The reason for this is, even in the middle of gesture typing, you'll still
-                // tap one-letter words and you want them auto-corrected (typically, "i" in English
-                // should become "I"). However for any longer word, we assume that the reason for
-                // tapping probably is that the word you intend to type is not in the dictionary,
-                // so we do not attempt to correct, on the assumption that if that was a dictionary
-                // word, the user would probably have gestured instead.
-                commitCurrentAutoCorrection(LastComposedWord.NOT_A_SEPARATOR);
-            } else {
-                commitTyped(LastComposedWord.NOT_A_SEPARATOR);
-            }
-            mExpectingUpdateSelection = true;
-        }
-        final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor();
-        if (Character.isLetterOrDigit(codePointBeforeCursor)
-                || settingsValues.isUsuallyFollowedBySpace(codePointBeforeCursor)) {
-            mSpaceState = SPACE_STATE_PHANTOM;
-        }
-        mConnection.endBatchEdit();
-        mWordComposer.setCapitalizedModeAtStartComposingTime(getActualCapsMode());
+        mInputLogic.onStartBatchInput(mSettings.getCurrent(),  mKeyboardSwitcher, mHandler);
     }
 
-    static final class InputUpdater implements Handler.Callback {
-        private final Handler mHandler;
-        private final LatinIME mLatinIme;
-        private final Object mLock = new Object();
-        private boolean mInBatchInput; // synchronized using {@link #mLock}.
-
-        InputUpdater(final LatinIME latinIme) {
-            final HandlerThread handlerThread = new HandlerThread(
-                    InputUpdater.class.getSimpleName());
-            handlerThread.start();
-            mHandler = new Handler(handlerThread.getLooper(), this);
-            mLatinIme = latinIme;
-        }
-
-        private static final int MSG_UPDATE_GESTURE_PREVIEW_AND_SUGGESTION_STRIP = 1;
-        private static final int MSG_GET_SUGGESTED_WORDS = 2;
-
-        @Override
-        public boolean handleMessage(final Message msg) {
-            // TODO: straighten message passing - we don't need two kinds of messages calling
-            // each other.
-            switch (msg.what) {
-                case MSG_UPDATE_GESTURE_PREVIEW_AND_SUGGESTION_STRIP:
-                    updateBatchInput((InputPointers)msg.obj, msg.arg2 /* sequenceNumber */);
-                    break;
-                case MSG_GET_SUGGESTED_WORDS:
-                    mLatinIme.getSuggestedWords(msg.arg1 /* sessionId */,
-                            msg.arg2 /* sequenceNumber */, (OnGetSuggestedWordsCallback) msg.obj);
-                    break;
-            }
-            return true;
-        }
-
-        // Run in the UI thread.
-        public void onStartBatchInput() {
-            synchronized (mLock) {
-                mHandler.removeMessages(MSG_UPDATE_GESTURE_PREVIEW_AND_SUGGESTION_STRIP);
-                mInBatchInput = true;
-                mLatinIme.mHandler.showGesturePreviewAndSuggestionStrip(
-                        SuggestedWords.EMPTY, false /* dismissGestureFloatingPreviewText */);
-            }
-        }
-
-        // Run in the Handler thread.
-        private void updateBatchInput(final InputPointers batchPointers, final int sequenceNumber) {
-            synchronized (mLock) {
-                if (!mInBatchInput) {
-                    // Batch input has ended or canceled while the message was being delivered.
-                    return;
-                }
-
-                getSuggestedWordsGestureLocked(batchPointers, sequenceNumber,
-                        new OnGetSuggestedWordsCallback() {
-                    @Override
-                    public void onGetSuggestedWords(final SuggestedWords suggestedWords) {
-                        mLatinIme.mHandler.showGesturePreviewAndSuggestionStrip(
-                                suggestedWords, false /* dismissGestureFloatingPreviewText */);
-                    }
-                });
-            }
-        }
-
-        // Run in the UI thread.
-        public void onUpdateBatchInput(final InputPointers batchPointers,
-                final int sequenceNumber) {
-            if (mHandler.hasMessages(MSG_UPDATE_GESTURE_PREVIEW_AND_SUGGESTION_STRIP)) {
-                return;
-            }
-            mHandler.obtainMessage(MSG_UPDATE_GESTURE_PREVIEW_AND_SUGGESTION_STRIP, 0 /* arg1 */,
-                    sequenceNumber /* arg2 */, batchPointers /* obj */).sendToTarget();
-        }
-
-        public void onCancelBatchInput() {
-            synchronized (mLock) {
-                mInBatchInput = false;
-                mLatinIme.mHandler.showGesturePreviewAndSuggestionStrip(
-                        SuggestedWords.EMPTY, true /* dismissGestureFloatingPreviewText */);
-            }
-        }
-
-        // Run in the UI thread.
-        public void onEndBatchInput(final InputPointers batchPointers) {
-            synchronized(mLock) {
-                getSuggestedWordsGestureLocked(batchPointers, SuggestedWords.NOT_A_SEQUENCE_NUMBER,
-                        new OnGetSuggestedWordsCallback() {
-                    @Override
-                    public void onGetSuggestedWords(final SuggestedWords suggestedWords) {
-                        mInBatchInput = false;
-                        mLatinIme.mHandler.showGesturePreviewAndSuggestionStrip(suggestedWords,
-                                true /* dismissGestureFloatingPreviewText */);
-                        mLatinIme.mHandler.onEndBatchInput(suggestedWords);
-                    }
-                });
-            }
-        }
-
-        // {@link LatinIME#getSuggestedWords(int)} method calls with same session id have to
-        // be synchronized.
-        private void getSuggestedWordsGestureLocked(final InputPointers batchPointers,
-                final int sequenceNumber, final OnGetSuggestedWordsCallback callback) {
-            mLatinIme.mWordComposer.setBatchInputPointers(batchPointers);
-            mLatinIme.getSuggestedWordsOrOlderSuggestionsAsync(Suggest.SESSION_GESTURE,
-                    sequenceNumber, new OnGetSuggestedWordsCallback() {
-                @Override
-                public void onGetSuggestedWords(SuggestedWords suggestedWords) {
-                    final int suggestionCount = suggestedWords.size();
-                    if (suggestionCount <= 1) {
-                        final String mostProbableSuggestion = (suggestionCount == 0) ? null
-                                : suggestedWords.getWord(0);
-                        callback.onGetSuggestedWords(
-                                mLatinIme.getOlderSuggestions(mostProbableSuggestion));
-                    }
-                    callback.onGetSuggestedWords(suggestedWords);
-                }
-            });
-        }
-
-        public void getSuggestedWords(final int sessionId, final int sequenceNumber,
-                final OnGetSuggestedWordsCallback callback) {
-            mHandler.obtainMessage(MSG_GET_SUGGESTED_WORDS, sessionId, sequenceNumber, callback)
-                    .sendToTarget();
-        }
-
-        void quitLooper() {
-            mHandler.removeMessages(MSG_GET_SUGGESTED_WORDS);
-            mHandler.removeMessages(MSG_UPDATE_GESTURE_PREVIEW_AND_SUGGESTION_STRIP);
-            mHandler.getLooper().quit();
-        }
+    @Override
+    public void onUpdateBatchInput(final InputPointers batchPointers) {
+        mInputLogic.onUpdateBatchInput(mSettings.getCurrent(), batchPointers, mKeyboardSwitcher);
     }
 
-    // This method must run in UI Thread.
+    @Override
+    public void onEndBatchInput(final InputPointers batchPointers) {
+        mInputLogic.onEndBatchInput(mSettings.getCurrent(), batchPointers);
+    }
+
+    @Override
+    public void onCancelBatchInput() {
+        mInputLogic.onCancelBatchInput(mHandler);
+    }
+
+    // This method must run on the UI Thread.
     private void showGesturePreviewAndSuggestionStrip(final SuggestedWords suggestedWords,
             final boolean dismissGestureFloatingPreviewText) {
         showSuggestionStrip(suggestedWords);
@@ -1964,102 +1276,6 @@
         }
     }
 
-    /* The sequence number member is only used in onUpdateBatchInput. It is increased each time
-     * auto-commit happens. The reason we need this is, when auto-commit happens we trim the
-     * input pointers that are held in a singleton, and to know how much to trim we rely on the
-     * results of the suggestion process that is held in mSuggestedWords.
-     * However, the suggestion process is asynchronous, and sometimes we may enter the
-     * onUpdateBatchInput method twice without having recomputed suggestions yet, or having
-     * received new suggestions generated from not-yet-trimmed input pointers. In this case, the
-     * mIndexOfTouchPointOfSecondWords member will be out of date, and we must not use it lest we
-     * remove an unrelated number of pointers (possibly even more than are left in the input
-     * pointers, leading to a crash).
-     * To avoid that, we increase the sequence number each time we auto-commit and trim the
-     * input pointers, and we do not use any suggested words that have been generated with an
-     * earlier sequence number.
-     */
-    private int mAutoCommitSequenceNumber = 1;
-    @Override
-    public void onUpdateBatchInput(final InputPointers batchPointers) {
-        if (mSettings.getCurrent().mPhraseGestureEnabled) {
-            final SuggestedWordInfo candidate = mSuggestedWords.getAutoCommitCandidate();
-            // If these suggested words have been generated with out of date input pointers, then
-            // we skip auto-commit (see comments above on the mSequenceNumber member).
-            if (null != candidate && mSuggestedWords.mSequenceNumber >= mAutoCommitSequenceNumber) {
-                if (candidate.mSourceDict.shouldAutoCommit(candidate)) {
-                    final String[] commitParts = candidate.mWord.split(" ", 2);
-                    batchPointers.shift(candidate.mIndexOfTouchPointOfSecondWord);
-                    promotePhantomSpace();
-                    mConnection.commitText(commitParts[0], 0);
-                    mSpaceState = SPACE_STATE_PHANTOM;
-                    mKeyboardSwitcher.updateShiftState();
-                    mWordComposer.setCapitalizedModeAtStartComposingTime(getActualCapsMode());
-                    ++mAutoCommitSequenceNumber;
-                }
-            }
-        }
-        mInputUpdater.onUpdateBatchInput(batchPointers, mAutoCommitSequenceNumber);
-    }
-
-    // This method must run in UI Thread.
-    public void onEndBatchInputAsyncInternal(final SuggestedWords suggestedWords) {
-        final String batchInputText = suggestedWords.isEmpty()
-                ? null : suggestedWords.getWord(0);
-        if (TextUtils.isEmpty(batchInputText)) {
-            return;
-        }
-        mConnection.beginBatchEdit();
-        if (SPACE_STATE_PHANTOM == mSpaceState) {
-            promotePhantomSpace();
-        }
-        if (mSettings.getCurrent().mPhraseGestureEnabled) {
-            // Find the last space
-            final int indexOfLastSpace = batchInputText.lastIndexOf(Constants.CODE_SPACE) + 1;
-            if (0 != indexOfLastSpace) {
-                mConnection.commitText(batchInputText.substring(0, indexOfLastSpace), 1);
-                showSuggestionStrip(suggestedWords.getSuggestedWordsForLastWordOfPhraseGesture());
-            }
-            final String lastWord = batchInputText.substring(indexOfLastSpace);
-            mWordComposer.setBatchInputWord(lastWord);
-            mConnection.setComposingText(lastWord, 1);
-        } else {
-            mWordComposer.setBatchInputWord(batchInputText);
-            mConnection.setComposingText(batchInputText, 1);
-        }
-        mExpectingUpdateSelection = true;
-        mConnection.endBatchEdit();
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.latinIME_onEndBatchInput(batchInputText, 0, suggestedWords);
-        }
-        // Space state must be updated before calling updateShiftState
-        mSpaceState = SPACE_STATE_PHANTOM;
-        mKeyboardSwitcher.updateShiftState();
-    }
-
-    @Override
-    public void onEndBatchInput(final InputPointers batchPointers) {
-        mInputUpdater.onEndBatchInput(batchPointers);
-    }
-
-    private String specificTldProcessingOnTextInput(final String text) {
-        if (text.length() <= 1 || text.charAt(0) != Constants.CODE_PERIOD
-                || !Character.isLetter(text.charAt(1))) {
-            // Not a tld: do nothing.
-            return text;
-        }
-        // We have a TLD (or something that looks like this): make sure we don't add
-        // a space even if currently in phantom mode.
-        mSpaceState = SPACE_STATE_NONE;
-        // TODO: use getCodePointBeforeCursor instead to improve performance and simplify the code
-        final CharSequence lastOne = mConnection.getTextBeforeCursor(1, 0);
-        if (lastOne != null && lastOne.length() == 1
-                && lastOne.charAt(0) == Constants.CODE_PERIOD) {
-            return text.substring(1);
-        } else {
-            return text;
-        }
-    }
-
     // Called from PointerTracker through the KeyboardActionListener interface
     @Override
     public void onFinishSlidingInput() {
@@ -2074,393 +1290,16 @@
         // Nothing to do so far.
     }
 
-    @Override
-    public void onCancelBatchInput() {
-        mInputUpdater.onCancelBatchInput();
-    }
-
-    private void handleBackspace(final int spaceState) {
-        // We revert these in this method if the deletion doesn't happen.
-        mDeleteCount++;
-        mExpectingUpdateSelection = true;
-
-        // In many cases, we may have to put the keyboard in auto-shift state again. However
-        // we want to wait a few milliseconds before doing it to avoid the keyboard flashing
-        // during key repeat.
-        mHandler.postUpdateShiftState();
-
-        if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
-            // If we are in the middle of a recorrection, we need to commit the recorrection
-            // first so that we can remove the character at the current cursor position.
-            resetEntireInputState(mLastSelectionStart);
-            // When we exit this if-clause, mWordComposer.isComposingWord() will return false.
-        }
-        if (mWordComposer.isComposingWord()) {
-            if (mWordComposer.isBatchMode()) {
-                if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                    final String word = mWordComposer.getTypedWord();
-                    ResearchLogger.latinIME_handleBackspace_batch(word, 1);
-                }
-                final String rejectedSuggestion = mWordComposer.getTypedWord();
-                mWordComposer.reset();
-                mWordComposer.setRejectedBatchModeSuggestion(rejectedSuggestion);
-            } else {
-                mWordComposer.deleteLast();
-            }
-            mConnection.setComposingText(getTextWithUnderline(mWordComposer.getTypedWord()), 1);
-            mHandler.postUpdateSuggestionStrip();
-            if (!mWordComposer.isComposingWord()) {
-                // If we just removed the last character, auto-caps mode may have changed so we
-                // need to re-evaluate.
-                mKeyboardSwitcher.updateShiftState();
-            }
-        } else {
-            final SettingsValues currentSettings = mSettings.getCurrent();
-            if (mLastComposedWord.canRevertCommit()) {
-                if (currentSettings.mIsInternal) {
-                    LatinImeLoggerUtils.onAutoCorrectionCancellation();
-                }
-                revertCommit();
-                return;
-            }
-            if (mEnteredText != null && mConnection.sameAsTextBeforeCursor(mEnteredText)) {
-                // Cancel multi-character input: remove the text we just entered.
-                // This is triggered on backspace after a key that inputs multiple characters,
-                // like the smiley key or the .com key.
-                mConnection.deleteSurroundingText(mEnteredText.length(), 0);
-                if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                    ResearchLogger.latinIME_handleBackspace_cancelTextInput(mEnteredText);
-                }
-                mEnteredText = null;
-                // If we have mEnteredText, then we know that mHasUncommittedTypedChars == false.
-                // In addition we know that spaceState is false, and that we should not be
-                // reverting any autocorrect at this point. So we can safely return.
-                return;
-            }
-            if (SPACE_STATE_DOUBLE == spaceState) {
-                mHandler.cancelDoubleSpacePeriodTimer();
-                if (mConnection.revertDoubleSpacePeriod()) {
-                    // No need to reset mSpaceState, it has already be done (that's why we
-                    // receive it as a parameter)
-                    return;
-                }
-            } else if (SPACE_STATE_SWAP_PUNCTUATION == spaceState) {
-                if (mConnection.revertSwapPunctuation()) {
-                    // Likewise
-                    return;
-                }
-            }
-
-            // No cancelling of commit/double space/swap: we have a regular backspace.
-            // We should backspace one char and restart suggestion if at the end of a word.
-            if (mLastSelectionStart != mLastSelectionEnd) {
-                // If there is a selection, remove it.
-                final int numCharsDeleted = mLastSelectionEnd - mLastSelectionStart;
-                mConnection.setSelection(mLastSelectionEnd, mLastSelectionEnd);
-                // Reset mLastSelectionEnd to mLastSelectionStart. This is what is supposed to
-                // happen, and if it's wrong, the next call to onUpdateSelection will correct it,
-                // but we want to set it right away to avoid it being used with the wrong values
-                // later (typically, in a subsequent press on backspace).
-                mLastSelectionEnd = mLastSelectionStart;
-                mConnection.deleteSurroundingText(numCharsDeleted, 0);
-            } else {
-                // There is no selection, just delete one character.
-                if (NOT_A_CURSOR_POSITION == mLastSelectionEnd) {
-                    // This should never happen.
-                    Log.e(TAG, "Backspace when we don't know the selection position");
-                }
-                if (mAppWorkAroundsUtils.isBeforeJellyBean() ||
-                        currentSettings.mInputAttributes.isTypeNull()) {
-                    // There are two possible reasons to send a key event: either the field has
-                    // type TYPE_NULL, in which case the keyboard should send events, or we are
-                    // running in backward compatibility mode. Before Jelly bean, the keyboard
-                    // would simulate a hardware keyboard event on pressing enter or delete. This
-                    // is bad for many reasons (there are race conditions with commits) but some
-                    // applications are relying on this behavior so we continue to support it for
-                    // older apps, so we retain this behavior if the app has target SDK < JellyBean.
-                    sendDownUpKeyEvent(KeyEvent.KEYCODE_DEL);
-                    if (mDeleteCount > DELETE_ACCELERATE_AT) {
-                        sendDownUpKeyEvent(KeyEvent.KEYCODE_DEL);
-                    }
-                } else {
-                    final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor();
-                    if (codePointBeforeCursor == Constants.NOT_A_CODE) {
-                        // Nothing to delete before the cursor. We have to revert the deletion
-                        // states that were updated at the beginning of this method.
-                        mDeleteCount--;
-                        mExpectingUpdateSelection = false;
-                        return;
-                    }
-                    final int lengthToDelete =
-                            Character.isSupplementaryCodePoint(codePointBeforeCursor) ? 2 : 1;
-                    mConnection.deleteSurroundingText(lengthToDelete, 0);
-                    if (mDeleteCount > DELETE_ACCELERATE_AT) {
-                        final int codePointBeforeCursorToDeleteAgain =
-                                mConnection.getCodePointBeforeCursor();
-                        if (codePointBeforeCursorToDeleteAgain != Constants.NOT_A_CODE) {
-                            final int lengthToDeleteAgain = Character.isSupplementaryCodePoint(
-                                   codePointBeforeCursorToDeleteAgain) ? 2 : 1;
-                            mConnection.deleteSurroundingText(lengthToDeleteAgain, 0);
-                        }
-                    }
-                }
-            }
-            if (currentSettings.isSuggestionsRequested(mDisplayOrientation)
-                    && currentSettings.mCurrentLanguageHasSpaces) {
-                restartSuggestionsOnWordBeforeCursorIfAtEndOfWord();
-            }
-            // We just removed a character. We need to update the auto-caps state.
-            mKeyboardSwitcher.updateShiftState();
-        }
-    }
-
-    /*
-     * Strip a trailing space if necessary and returns whether it's a swap weak space situation.
-     */
-    private boolean maybeStripSpace(final int code,
-            final int spaceState, final boolean isFromSuggestionStrip) {
-        if (Constants.CODE_ENTER == code && SPACE_STATE_SWAP_PUNCTUATION == spaceState) {
-            mConnection.removeTrailingSpace();
-            return false;
-        }
-        if ((SPACE_STATE_WEAK == spaceState || SPACE_STATE_SWAP_PUNCTUATION == spaceState)
-                && isFromSuggestionStrip) {
-            final SettingsValues currentSettings = mSettings.getCurrent();
-            if (currentSettings.isUsuallyPrecededBySpace(code)) return false;
-            if (currentSettings.isUsuallyFollowedBySpace(code)) return true;
-            mConnection.removeTrailingSpace();
-        }
-        return false;
-    }
-
-    private void handleCharacter(final int primaryCode, final int x,
-            final int y, final int spaceState) {
-        // TODO: refactor this method to stop flipping isComposingWord around all the time, and
-        // make it shorter (possibly cut into several pieces). Also factor handleNonSpecialCharacter
-        // which has the same name as other handle* methods but is not the same.
-        boolean isComposingWord = mWordComposer.isComposingWord();
-
-        // TODO: remove isWordConnector() and use isUsuallyFollowedBySpace() instead.
-        // See onStartBatchInput() to see how to do it.
-        final SettingsValues currentSettings = mSettings.getCurrent();
-        if (SPACE_STATE_PHANTOM == spaceState && !currentSettings.isWordConnector(primaryCode)) {
-            if (isComposingWord) {
-                // Sanity check
-                throw new RuntimeException("Should not be composing here");
-            }
-            promotePhantomSpace();
-        }
-
-        if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
-            // If we are in the middle of a recorrection, we need to commit the recorrection
-            // first so that we can insert the character at the current cursor position.
-            resetEntireInputState(mLastSelectionStart);
-            isComposingWord = false;
-        }
-        // We want to find out whether to start composing a new word with this character. If so,
-        // we need to reset the composing state and switch isComposingWord. The order of the
-        // tests is important for good performance.
-        // We only start composing if we're not already composing.
-        if (!isComposingWord
-        // We only start composing if this is a word code point. Essentially that means it's a
-        // a letter or a word connector.
-                && currentSettings.isWordCodePoint(primaryCode)
-        // We never go into composing state if suggestions are not requested.
-                && currentSettings.isSuggestionsRequested(mDisplayOrientation) &&
-        // In languages with spaces, we only start composing a word when we are not already
-        // touching a word. In languages without spaces, the above conditions are sufficient.
-                (!mConnection.isCursorTouchingWord(currentSettings)
-                        || !currentSettings.mCurrentLanguageHasSpaces)) {
-            // Reset entirely the composing state anyway, then start composing a new word unless
-            // the character is a single quote or a dash. The idea here is, single quote and dash
-            // are not separators and they should be treated as normal characters, except in the
-            // first position where they should not start composing a word.
-            isComposingWord = (Constants.CODE_SINGLE_QUOTE != primaryCode
-                    && Constants.CODE_DASH != primaryCode);
-            // Here we don't need to reset the last composed word. It will be reset
-            // when we commit this one, if we ever do; if on the other hand we backspace
-            // it entirely and resume suggestions on the previous word, we'd like to still
-            // have touch coordinates for it.
-            resetComposingState(false /* alsoResetLastComposedWord */);
-        }
-        if (isComposingWord) {
-            final int keyX, keyY;
-            if (Constants.isValidCoordinate(x) && Constants.isValidCoordinate(y)) {
-                final KeyDetector keyDetector =
-                        mKeyboardSwitcher.getMainKeyboardView().getKeyDetector();
-                keyX = keyDetector.getTouchX(x);
-                keyY = keyDetector.getTouchY(y);
-            } else {
-                keyX = x;
-                keyY = y;
-            }
-            mWordComposer.add(primaryCode, keyX, keyY);
-            // If it's the first letter, make note of auto-caps state
-            if (mWordComposer.size() == 1) {
-                mWordComposer.setCapitalizedModeAtStartComposingTime(getActualCapsMode());
-            }
-            mConnection.setComposingText(getTextWithUnderline(mWordComposer.getTypedWord()), 1);
-        } else {
-            final boolean swapWeakSpace = maybeStripSpace(primaryCode,
-                    spaceState, Constants.SUGGESTION_STRIP_COORDINATE == x);
-
-            sendKeyCodePoint(primaryCode);
-
-            if (swapWeakSpace) {
-                swapSwapperAndSpace();
-                mSpaceState = SPACE_STATE_WEAK;
-            }
-            // In case the "add to dictionary" hint was still displayed.
-            if (null != mSuggestionStripView) mSuggestionStripView.dismissAddToDictionaryHint();
-        }
-        mHandler.postUpdateSuggestionStrip();
-        if (currentSettings.mIsInternal) {
-            LatinImeLoggerUtils.onNonSeparator((char)primaryCode, x, y);
-        }
-    }
-
-    private void handleRecapitalize() {
-        if (mLastSelectionStart == mLastSelectionEnd) return; // No selection
-        // If we have a recapitalize in progress, use it; otherwise, create a new one.
-        if (!mRecapitalizeStatus.isActive()
-                || !mRecapitalizeStatus.isSetAt(mLastSelectionStart, mLastSelectionEnd)) {
-            final CharSequence selectedText =
-                    mConnection.getSelectedText(0 /* flags, 0 for no styles */);
-            if (TextUtils.isEmpty(selectedText)) return; // Race condition with the input connection
-            final SettingsValues currentSettings = mSettings.getCurrent();
-            mRecapitalizeStatus.initialize(mLastSelectionStart, mLastSelectionEnd,
-                    selectedText.toString(), currentSettings.mLocale,
-                    currentSettings.mWordSeparators);
-            // We trim leading and trailing whitespace.
-            mRecapitalizeStatus.trim();
-            // Trimming the object may have changed the length of the string, and we need to
-            // reposition the selection handles accordingly. As this result in an IPC call,
-            // only do it if it's actually necessary, in other words if the recapitalize status
-            // is not set at the same place as before.
-            if (!mRecapitalizeStatus.isSetAt(mLastSelectionStart, mLastSelectionEnd)) {
-                mLastSelectionStart = mRecapitalizeStatus.getNewCursorStart();
-                mLastSelectionEnd = mRecapitalizeStatus.getNewCursorEnd();
-            }
-        }
-        mConnection.finishComposingText();
-        mRecapitalizeStatus.rotate();
-        final int numCharsDeleted = mLastSelectionEnd - mLastSelectionStart;
-        mConnection.setSelection(mLastSelectionEnd, mLastSelectionEnd);
-        mConnection.deleteSurroundingText(numCharsDeleted, 0);
-        mConnection.commitText(mRecapitalizeStatus.getRecapitalizedString(), 0);
-        mLastSelectionStart = mRecapitalizeStatus.getNewCursorStart();
-        mLastSelectionEnd = mRecapitalizeStatus.getNewCursorEnd();
-        mConnection.setSelection(mLastSelectionStart, mLastSelectionEnd);
-        // Match the keyboard to the new state.
-        mKeyboardSwitcher.updateShiftState();
-    }
-
-    // Returns true if we do an autocorrection, false otherwise.
-    private boolean handleSeparator(final int primaryCode, final int x, final int y,
-            final int spaceState) {
-        boolean didAutoCorrect = false;
-        final SettingsValues currentSettings = mSettings.getCurrent();
-        // We avoid sending spaces in languages without spaces if we were composing.
-        final boolean shouldAvoidSendingCode = Constants.CODE_SPACE == primaryCode
-                && !currentSettings.mCurrentLanguageHasSpaces && mWordComposer.isComposingWord();
-        if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
-            // If we are in the middle of a recorrection, we need to commit the recorrection
-            // first so that we can insert the separator at the current cursor position.
-            resetEntireInputState(mLastSelectionStart);
-        }
-        if (mWordComposer.isComposingWord()) { // May have changed since we stored wasComposing
-            if (currentSettings.mCorrectionEnabled) {
-                final String separator = shouldAvoidSendingCode ? LastComposedWord.NOT_A_SEPARATOR
-                        : StringUtils.newSingleCodePointString(primaryCode);
-                commitCurrentAutoCorrection(separator);
-                didAutoCorrect = true;
-            } else {
-                commitTyped(StringUtils.newSingleCodePointString(primaryCode));
-            }
-        }
-
-        final boolean swapWeakSpace = maybeStripSpace(primaryCode, spaceState,
-                Constants.SUGGESTION_STRIP_COORDINATE == x);
-
-        if (SPACE_STATE_PHANTOM == spaceState &&
-                currentSettings.isUsuallyPrecededBySpace(primaryCode)) {
-            promotePhantomSpace();
-        }
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.latinIME_handleSeparator(primaryCode, mWordComposer.isComposingWord());
-        }
-
-        if (!shouldAvoidSendingCode) {
-            sendKeyCodePoint(primaryCode);
-        }
-
-        if (Constants.CODE_SPACE == primaryCode) {
-            if (currentSettings.isSuggestionsRequested(mDisplayOrientation)) {
-                if (maybeDoubleSpacePeriod()) {
-                    mSpaceState = SPACE_STATE_DOUBLE;
-                } else if (!isShowingPunctuationList()) {
-                    mSpaceState = SPACE_STATE_WEAK;
-                }
-            }
-
-            mHandler.startDoubleSpacePeriodTimer();
-            mHandler.postUpdateSuggestionStrip();
-        } else {
-            if (swapWeakSpace) {
-                swapSwapperAndSpace();
-                mSpaceState = SPACE_STATE_SWAP_PUNCTUATION;
-            } else if (SPACE_STATE_PHANTOM == spaceState
-                    && currentSettings.isUsuallyFollowedBySpace(primaryCode)) {
-                // If we are in phantom space state, and the user presses a separator, we want to
-                // stay in phantom space state so that the next keypress has a chance to add the
-                // space. For example, if I type "Good dat", pick "day" from the suggestion strip
-                // then insert a comma and go on to typing the next word, I want the space to be
-                // inserted automatically before the next word, the same way it is when I don't
-                // input the comma.
-                // The case is a little different if the separator is a space stripper. Such a
-                // separator does not normally need a space on the right (that's the difference
-                // between swappers and strippers), so we should not stay in phantom space state if
-                // the separator is a stripper. Hence the additional test above.
-                mSpaceState = SPACE_STATE_PHANTOM;
-            }
-
-            // Set punctuation right away. onUpdateSelection will fire but tests whether it is
-            // already displayed or not, so it's okay.
-            setPunctuationSuggestions();
-        }
-        if (currentSettings.mIsInternal) {
-            LatinImeLoggerUtils.onSeparator((char)primaryCode, x, y);
-        }
-
-        mKeyboardSwitcher.updateShiftState();
-        return didAutoCorrect;
-    }
-
-    private CharSequence getTextWithUnderline(final String text) {
-        return mIsAutoCorrectionIndicatorOn
-                ? SuggestionSpanUtils.getTextWithAutoCorrectionIndicatorUnderline(this, text)
-                : text;
-    }
-
-    private void handleClose() {
-        // TODO: Verify that words are logged properly when IME is closed.
-        commitTyped(LastComposedWord.NOT_A_SEPARATOR);
-        requestHideSelf(0);
-        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
-        if (mainKeyboardView != null) {
-            mainKeyboardView.closing();
-        }
-    }
-
-    // TODO: make this private
+    // TODO[IL]: Move this to InputLogic and make it private
     // Outside LatinIME, only used by the test suite.
     @UsedForTesting
-    boolean isShowingPunctuationList() {
-        if (mSuggestedWords == null) return false;
-        return mSettings.getCurrent().mSuggestPuncList == mSuggestedWords;
+    public boolean isShowingPunctuationList() {
+        if (mInputLogic.mSuggestedWords == null) return false;
+        return mSettings.getCurrent().mSuggestPuncList == mInputLogic.mSuggestedWords;
     }
 
-    private boolean isSuggestionsStripVisible() {
+    // TODO[IL]: Define a clear interface for this
+    public boolean isSuggestionsStripVisible() {
         final SettingsValues currentSettings = mSettings.getCurrent();
         if (mSuggestionStripView == null)
             return false;
@@ -2468,81 +1307,54 @@
             return true;
         if (null == currentSettings)
             return false;
-        if (!currentSettings.isSuggestionStripVisibleInOrientation(mDisplayOrientation))
+        if (!currentSettings.isSuggestionStripVisible())
             return false;
         if (currentSettings.isApplicationSpecifiedCompletionsOn())
             return true;
-        return currentSettings.isSuggestionsRequested(mDisplayOrientation);
+        return currentSettings.isSuggestionsRequested();
     }
 
-    private void clearSuggestionStrip() {
-        setSuggestedWords(SuggestedWords.EMPTY, false);
+    public void dismissAddToDictionaryHint() {
+        if (null != mSuggestionStripView) {
+            mSuggestionStripView.dismissAddToDictionaryHint();
+        }
+    }
+
+    // TODO[IL]: Define a clear interface for this
+    public void clearSuggestionStrip() {
+        setSuggestedWords(SuggestedWords.EMPTY);
         setAutoCorrectionIndicator(false);
     }
 
-    private void setSuggestedWords(final SuggestedWords words, final boolean isAutoCorrection) {
-        mSuggestedWords = words;
+    // TODO[IL]: Define a clear interface for this
+    public void setSuggestedWords(final SuggestedWords words) {
+        mInputLogic.mSuggestedWords = words;
         if (mSuggestionStripView != null) {
             mSuggestionStripView.setSuggestions(words);
-            mKeyboardSwitcher.onAutoCorrectionStateChanged(isAutoCorrection);
+            mKeyboardSwitcher.onAutoCorrectionStateChanged(words.mWillAutoCorrect);
         }
     }
 
     private void setAutoCorrectionIndicator(final boolean newAutoCorrectionIndicator) {
         // Put a blue underline to a word in TextView which will be auto-corrected.
-        if (mIsAutoCorrectionIndicatorOn != newAutoCorrectionIndicator
-                && mWordComposer.isComposingWord()) {
-            mIsAutoCorrectionIndicatorOn = newAutoCorrectionIndicator;
+        if (mInputLogic.mIsAutoCorrectionIndicatorOn != newAutoCorrectionIndicator
+                && mInputLogic.mWordComposer.isComposingWord()) {
+            mInputLogic.mIsAutoCorrectionIndicatorOn = newAutoCorrectionIndicator;
             final CharSequence textWithUnderline =
-                    getTextWithUnderline(mWordComposer.getTypedWord());
+                    mInputLogic.getTextWithUnderline(mInputLogic.mWordComposer.getTypedWord());
             // TODO: when called from an updateSuggestionStrip() call that results from a posted
             // message, this is called outside any batch edit. Potentially, this may result in some
             // janky flickering of the screen, although the display speed makes it unlikely in
             // the practice.
-            mConnection.setComposingText(textWithUnderline, 1);
+            mInputLogic.mConnection.setComposingText(textWithUnderline, 1);
         }
     }
 
-    private void updateSuggestionStrip() {
-        mHandler.cancelUpdateSuggestionStrip();
-        final SettingsValues currentSettings = mSettings.getCurrent();
-
-        // Check if we have a suggestion engine attached.
-        if (mSuggest == null
-                || !currentSettings.isSuggestionsRequested(mDisplayOrientation)) {
-            if (mWordComposer.isComposingWord()) {
-                Log.w(TAG, "Called updateSuggestionsOrPredictions but suggestions were not "
-                        + "requested!");
-            }
-            return;
-        }
-
-        if (!mWordComposer.isComposingWord() && !currentSettings.mBigramPredictionEnabled) {
-            setPunctuationSuggestions();
-            return;
-        }
-
-        final AsyncResultHolder<SuggestedWords> holder = new AsyncResultHolder<SuggestedWords>();
-        getSuggestedWordsOrOlderSuggestionsAsync(Suggest.SESSION_TYPING,
-                SuggestedWords.NOT_A_SEQUENCE_NUMBER, new OnGetSuggestedWordsCallback() {
-                    @Override
-                    public void onGetSuggestedWords(final SuggestedWords suggestedWords) {
-                        holder.set(suggestedWords);
-                    }
-                }
-        );
-
-        // This line may cause the current thread to wait.
-        final SuggestedWords suggestedWords = holder.get(null, GET_SUGGESTED_WORDS_TIMEOUT);
-        if (suggestedWords != null) {
-            showSuggestionStrip(suggestedWords);
-        }
-    }
-
-    private void getSuggestedWords(final int sessionId, final int sequenceNumber,
+    // TODO[IL]: Move this out of LatinIME.
+    public void getSuggestedWords(final int sessionId, final int sequenceNumber,
             final OnGetSuggestedWordsCallback callback) {
         final Keyboard keyboard = mKeyboardSwitcher.getKeyboard();
-        final Suggest suggest = mSuggest;
+        final Suggest suggest = mInputLogic.mSuggest;
         if (keyboard == null || suggest == null) {
             callback.onGetSuggestedWords(SuggestedWords.EMPTY);
             return;
@@ -2552,44 +1364,44 @@
         // should just skip whitespace if any, so 1.
         final SettingsValues currentSettings = mSettings.getCurrent();
         final int[] additionalFeaturesOptions = currentSettings.mAdditionalFeaturesSettingValues;
-        final String prevWord;
-        if (currentSettings.mCurrentLanguageHasSpaces) {
-            // If we are typing in a language with spaces we can just look up the previous
-            // word from textview.
-            prevWord = mConnection.getNthPreviousWord(currentSettings.mWordSeparators,
-                    mWordComposer.isComposingWord() ? 2 : 1);
-        } else {
-            prevWord = LastComposedWord.NOT_A_COMPOSED_WORD == mLastComposedWord ? null
-                    : mLastComposedWord.mCommittedWord;
+
+        if (DEBUG) {
+            if (mInputLogic.mWordComposer.isComposingWord()
+                    || mInputLogic.mWordComposer.isBatchMode()) {
+                final String previousWord
+                        = mInputLogic.mWordComposer.getPreviousWordForSuggestion();
+                // TODO: this is for checking consistency with older versions. Remove this when
+                // we are confident this is stable.
+                // We're checking the previous word in the text field against the memorized previous
+                // word. If we are composing a word we should have the second word before the cursor
+                // memorized, otherwise we should have the first.
+                final String rereadPrevWord = mInputLogic.getNthPreviousWordForSuggestion(
+                        currentSettings, mInputLogic.mWordComposer.isComposingWord() ? 2 : 1);
+                if (!TextUtils.equals(previousWord, rereadPrevWord)) {
+                    throw new RuntimeException("Unexpected previous word: "
+                            + previousWord + " <> " + rereadPrevWord);
+                }
+            }
         }
-        suggest.getSuggestedWords(mWordComposer, prevWord, keyboard.getProximityInfo(),
+        suggest.getSuggestedWords(mInputLogic.mWordComposer,
+                mInputLogic.mWordComposer.getPreviousWordForSuggestion(),
+                keyboard.getProximityInfo(),
                 currentSettings.mBlockPotentiallyOffensive, currentSettings.mCorrectionEnabled,
                 additionalFeaturesOptions, sessionId, sequenceNumber, callback);
     }
 
-    private void getSuggestedWordsOrOlderSuggestionsAsync(final int sessionId,
-            final int sequenceNumber, final OnGetSuggestedWordsCallback callback) {
-        mInputUpdater.getSuggestedWords(sessionId, sequenceNumber,
-                new OnGetSuggestedWordsCallback() {
-                    @Override
-                    public void onGetSuggestedWords(SuggestedWords suggestedWords) {
-                        callback.onGetSuggestedWords(maybeRetrieveOlderSuggestions(
-                                mWordComposer.getTypedWord(), suggestedWords));
-                    }
-                });
-    }
-
-    private SuggestedWords maybeRetrieveOlderSuggestions(final String typedWord,
+    // TODO[IL]: Move this to InputLogic
+    public SuggestedWords maybeRetrieveOlderSuggestions(final String typedWord,
             final SuggestedWords suggestedWords) {
         // TODO: consolidate this into getSuggestedWords
         // We update the suggestion strip only when we have some suggestions to show, i.e. when
         // the suggestion count is > 1; else, we leave the old suggestions, with the typed word
-        // replaced with the new one. However, when the word is a dictionary word, or when the
-        // length of the typed word is 1 or 0 (after a deletion typically), we do want to remove the
-        // old suggestions. Also, if we are showing the "add to dictionary" hint, we need to
-        // revert to suggestions - although it is unclear how we can come here if it's displayed.
+        // replaced with the new one. However, when the length of the typed word is 1 or 0 (after
+        // a deletion typically), we do want to remove the old suggestions. Also, if we are showing
+        // the "add to dictionary" hint, we need to revert to suggestions - although it is unclear
+        // how we can come here if it's displayed.
         if (suggestedWords.size() > 1 || typedWord.length() <= 1
-                || suggestedWords.mTypedWordValid || null == mSuggestionStripView
+                || null == mSuggestionStripView
                 || mSuggestionStripView.isShowingAddToDictionaryHint()) {
             return suggestedWords;
         } else {
@@ -2598,7 +1410,7 @@
     }
 
     private SuggestedWords getOlderSuggestions(final String typedWord) {
-        SuggestedWords previousSuggestedWords = mSuggestedWords;
+        SuggestedWords previousSuggestedWords = mInputLogic.mSuggestedWords;
         if (previousSuggestedWords == mSettings.getCurrent().mSuggestPuncList) {
             previousSuggestedWords = SuggestedWords.EMPTY;
         }
@@ -2616,19 +1428,6 @@
                 false /* isPrediction */);
     }
 
-    private void setAutoCorrection(final SuggestedWords suggestedWords, final String typedWord) {
-        if (suggestedWords.isEmpty()) return;
-        final String autoCorrection;
-        if (suggestedWords.mWillAutoCorrect) {
-            autoCorrection = suggestedWords.getWord(SuggestedWords.INDEX_OF_AUTO_CORRECTION);
-        } else {
-            // We can't use suggestedWords.getWord(SuggestedWords.INDEX_OF_TYPED_WORD)
-            // because it may differ from mWordComposer.mTypedWord.
-            autoCorrection = typedWord;
-        }
-        mWordComposer.setAutoCorrection(autoCorrection);
-    }
-
     private void showSuggestionStripWithTypedWord(final SuggestedWords suggestedWords,
             final String typedWord) {
       if (suggestedWords.isEmpty()) {
@@ -2637,17 +1436,25 @@
           clearSuggestionStrip();
           return;
       }
-      setAutoCorrection(suggestedWords, typedWord);
-      final boolean isAutoCorrection = suggestedWords.willAutoCorrect();
-      setSuggestedWords(suggestedWords, isAutoCorrection);
-      setAutoCorrectionIndicator(isAutoCorrection);
+      final String autoCorrection;
+      if (suggestedWords.mWillAutoCorrect) {
+          autoCorrection = suggestedWords.getWord(SuggestedWords.INDEX_OF_AUTO_CORRECTION);
+      } else {
+          // We can't use suggestedWords.getWord(SuggestedWords.INDEX_OF_TYPED_WORD)
+          // because it may differ from mWordComposer.mTypedWord.
+          autoCorrection = typedWord;
+      }
+      mInputLogic.mWordComposer.setAutoCorrection(autoCorrection);
+      setSuggestedWords(suggestedWords);
+      setAutoCorrectionIndicator(suggestedWords.mWillAutoCorrect);
       setSuggestionStripShown(isSuggestionsStripVisible());
       // An auto-correction is available, cache it in accessibility code so
       // we can be speak it if the user touches a key that will insert it.
       AccessibilityUtils.getInstance().setAutoCorrection(suggestedWords, typedWord);
     }
 
-    private void showSuggestionStrip(final SuggestedWords suggestedWords) {
+    // TODO[IL]: Define a clean interface for this
+    public void showSuggestionStrip(final SuggestedWords suggestedWords) {
         if (suggestedWords.isEmpty()) {
             clearSuggestionStrip();
             return;
@@ -2656,51 +1463,11 @@
             suggestedWords.getWord(SuggestedWords.INDEX_OF_TYPED_WORD));
     }
 
-    private void commitCurrentAutoCorrection(final String separator) {
-        // Complete any pending suggestions query first
-        if (mHandler.hasPendingUpdateSuggestions()) {
-            updateSuggestionStrip();
-        }
-        final String typedAutoCorrection = mWordComposer.getAutoCorrectionOrNull();
-        final String typedWord = mWordComposer.getTypedWord();
-        final String autoCorrection = (typedAutoCorrection != null)
-                ? typedAutoCorrection : typedWord;
-        if (autoCorrection != null) {
-            if (TextUtils.isEmpty(typedWord)) {
-                throw new RuntimeException("We have an auto-correction but the typed word "
-                        + "is empty? Impossible! I must commit suicide.");
-            }
-            if (mSettings.isInternal()) {
-                LatinImeLoggerUtils.onAutoCorrection(
-                        typedWord, autoCorrection, separator, mWordComposer);
-            }
-            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                final SuggestedWords suggestedWords = mSuggestedWords;
-                ResearchLogger.latinIme_commitCurrentAutoCorrection(typedWord, autoCorrection,
-                        separator, mWordComposer.isBatchMode(), suggestedWords);
-            }
-            mExpectingUpdateSelection = true;
-            commitChosenWord(autoCorrection, LastComposedWord.COMMIT_TYPE_DECIDED_WORD,
-                    separator);
-            if (!typedWord.equals(autoCorrection)) {
-                // This will make the correction flash for a short while as a visual clue
-                // to the user that auto-correction happened. It has no other effect; in particular
-                // note that this won't affect the text inside the text field AT ALL: it only makes
-                // the segment of text starting at the supplied index and running for the length
-                // of the auto-correction flash. At this moment, the "typedWord" argument is
-                // ignored by TextView.
-                mConnection.commitCorrection(
-                        new CorrectionInfo(mLastSelectionEnd - typedWord.length(),
-                        typedWord, autoCorrection));
-            }
-        }
-    }
-
     // Called from {@link SuggestionStripView} through the {@link SuggestionStripView#Listener}
     // interface
     @Override
     public void pickSuggestionManually(final int index, final SuggestedWordInfo suggestionInfo) {
-        final SuggestedWords suggestedWords = mSuggestedWords;
+        final SuggestedWords suggestedWords = mInputLogic.mSuggestedWords;
         final String suggestion = suggestionInfo.mWord;
         // If this is a punctuation picked from the suggestion strip, pass it to onCodeInput
         if (suggestion.length() == 1 && isShowingPunctuationList()) {
@@ -2718,70 +1485,71 @@
             return;
         }
 
-        mConnection.beginBatchEdit();
+        mInputLogic.mConnection.beginBatchEdit();
         final SettingsValues currentSettings = mSettings.getCurrent();
-        if (SPACE_STATE_PHANTOM == mSpaceState && suggestion.length() > 0
+        if (SpaceState.PHANTOM == mInputLogic.mSpaceState && suggestion.length() > 0
                 // In the batch input mode, a manually picked suggested word should just replace
                 // the current batch input text and there is no need for a phantom space.
-                && !mWordComposer.isBatchMode()) {
+                && !mInputLogic.mWordComposer.isBatchMode()) {
             final int firstChar = Character.codePointAt(suggestion, 0);
             if (!currentSettings.isWordSeparator(firstChar)
                     || currentSettings.isUsuallyPrecededBySpace(firstChar)) {
-                promotePhantomSpace();
+                mInputLogic.promotePhantomSpace(currentSettings);
             }
         }
 
         if (currentSettings.isApplicationSpecifiedCompletionsOn()
                 && mApplicationSpecifiedCompletions != null
                 && index >= 0 && index < mApplicationSpecifiedCompletions.length) {
-            mSuggestedWords = SuggestedWords.EMPTY;
+            mInputLogic.mSuggestedWords = SuggestedWords.EMPTY;
             if (mSuggestionStripView != null) {
                 mSuggestionStripView.clear();
             }
             mKeyboardSwitcher.updateShiftState();
-            resetComposingState(true /* alsoResetLastComposedWord */);
+            mInputLogic.resetComposingState(true /* alsoResetLastComposedWord */);
             final CompletionInfo completionInfo = mApplicationSpecifiedCompletions[index];
-            mConnection.commitCompletion(completionInfo);
-            mConnection.endBatchEdit();
+            mInputLogic.mConnection.commitCompletion(completionInfo);
+            mInputLogic.mConnection.endBatchEdit();
             return;
         }
 
         // We need to log before we commit, because the word composer will store away the user
         // typed word.
-        final String replacedWord = mWordComposer.getTypedWord();
+        final String replacedWord = mInputLogic.mWordComposer.getTypedWord();
         LatinImeLogger.logOnManualSuggestion(replacedWord, suggestion, index, suggestedWords);
-        mExpectingUpdateSelection = true;
-        commitChosenWord(suggestion, LastComposedWord.COMMIT_TYPE_MANUAL_PICK,
-                LastComposedWord.NOT_A_SEPARATOR);
+        mInputLogic.commitChosenWord(currentSettings, suggestion,
+                LastComposedWord.COMMIT_TYPE_MANUAL_PICK, LastComposedWord.NOT_A_SEPARATOR);
         if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
             ResearchLogger.latinIME_pickSuggestionManually(replacedWord, index, suggestion,
-                    mWordComposer.isBatchMode(), suggestionInfo.mScore, suggestionInfo.mKind,
-                    suggestionInfo.mSourceDict.mDictType);
+                    mInputLogic.mWordComposer.isBatchMode(), suggestionInfo.mScore,
+                    suggestionInfo.mKind, suggestionInfo.mSourceDict.mDictType);
         }
-        mConnection.endBatchEdit();
+        mInputLogic.mConnection.endBatchEdit();
         // Don't allow cancellation of manual pick
-        mLastComposedWord.deactivate();
+        mInputLogic.mLastComposedWord.deactivate();
         // Space state must be updated before calling updateShiftState
-        mSpaceState = SPACE_STATE_PHANTOM;
+        mInputLogic.mSpaceState = SpaceState.PHANTOM;
         mKeyboardSwitcher.updateShiftState();
 
         // We should show the "Touch again to save" hint if the user pressed the first entry
         // AND it's in none of our current dictionaries (main, user or otherwise).
         // Please note that if mSuggest is null, it means that everything is off: suggestion
         // and correction, so we shouldn't try to show the hint
-        final Suggest suggest = mSuggest;
+        final Suggest suggest = mInputLogic.mSuggest;
         final boolean showingAddToDictionaryHint =
                 (SuggestedWordInfo.KIND_TYPED == suggestionInfo.mKind
                         || SuggestedWordInfo.KIND_OOV_CORRECTION == suggestionInfo.mKind)
                         && suggest != null
                         // If the suggestion is not in the dictionary, the hint should be shown.
-                        && !AutoCorrectionUtils.isValidWord(suggest, suggestion, true);
+                        && !suggest.mDictionaryFacilitator.isValidWord(suggestion,
+                                true /* ignoreCase */);
 
         if (currentSettings.mIsInternal) {
             LatinImeLoggerUtils.onSeparator((char)Constants.CODE_SPACE,
                     Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
         }
-        if (showingAddToDictionaryHint && mIsUserDictionaryAvailable) {
+        if (showingAddToDictionaryHint
+                && suggest.mDictionaryFacilitator.isUserDictionaryEnabled()) {
             mSuggestionStripView.showAddToDictionaryHint(
                     suggestion, currentSettings.mHintToSaveText);
         } else {
@@ -2790,163 +1558,18 @@
         }
     }
 
-    /**
-     * Commits the chosen word to the text field and saves it for later retrieval.
-     */
-    private void commitChosenWord(final String chosenWord, final int commitType,
-            final String separatorString) {
-        final SuggestedWords suggestedWords = mSuggestedWords;
-        mConnection.commitText(SuggestionSpanUtils.getTextWithSuggestionSpan(
-                this, chosenWord, suggestedWords, mIsMainDictionaryAvailable), 1);
-        // Add the word to the user history dictionary
-        final String prevWord = addToUserHistoryDictionary(chosenWord);
-        // TODO: figure out here if this is an auto-correct or if the best word is actually
-        // what user typed. Note: currently this is done much later in
-        // LastComposedWord#didCommitTypedWord by string equality of the remembered
-        // strings.
-        mLastComposedWord = mWordComposer.commitWord(commitType, chosenWord, separatorString,
-                prevWord);
-    }
-
-    private void setPunctuationSuggestions() {
+    // TODO[IL]: Define a clean interface for this
+    public void setPunctuationSuggestions() {
         final SettingsValues currentSettings = mSettings.getCurrent();
         if (currentSettings.mBigramPredictionEnabled) {
             clearSuggestionStrip();
         } else {
-            setSuggestedWords(currentSettings.mSuggestPuncList, false);
+            setSuggestedWords(currentSettings.mSuggestPuncList);
         }
         setAutoCorrectionIndicator(false);
         setSuggestionStripShown(isSuggestionsStripVisible());
     }
 
-    private String addToUserHistoryDictionary(final String suggestion) {
-        if (TextUtils.isEmpty(suggestion)) return null;
-        final Suggest suggest = mSuggest;
-        if (suggest == null) return null;
-
-        // If correction is not enabled, we don't add words to the user history dictionary.
-        // That's to avoid unintended additions in some sensitive fields, or fields that
-        // expect to receive non-words.
-        final SettingsValues currentSettings = mSettings.getCurrent();
-        if (!currentSettings.mCorrectionEnabled) return null;
-
-        final UserHistoryDictionary userHistoryDictionary = mUserHistoryDictionary;
-        if (userHistoryDictionary == null) return null;
-
-        final String prevWord = mConnection.getNthPreviousWord(currentSettings.mWordSeparators, 2);
-        final String secondWord;
-        if (mWordComposer.wasAutoCapitalized() && !mWordComposer.isMostlyCaps()) {
-            secondWord = suggestion.toLowerCase(mSubtypeSwitcher.getCurrentSubtypeLocale());
-        } else {
-            secondWord = suggestion;
-        }
-        // We demote unrecognized words (frequency < 0, below) by specifying them as "invalid".
-        // We don't add words with 0-frequency (assuming they would be profanity etc.).
-        final int maxFreq = AutoCorrectionUtils.getMaxFrequency(
-                suggest.getUnigramDictionaries(), suggestion);
-        if (maxFreq == 0) return null;
-        userHistoryDictionary.addToDictionary(prevWord, secondWord, maxFreq > 0);
-        return prevWord;
-    }
-
-    private boolean isResumableWord(final String word, final SettingsValues settings) {
-        final int firstCodePoint = word.codePointAt(0);
-        return settings.isWordCodePoint(firstCodePoint)
-                && Constants.CODE_SINGLE_QUOTE != firstCodePoint
-                && Constants.CODE_DASH != firstCodePoint;
-    }
-
-    /**
-     * Check if the cursor is touching a word. If so, restart suggestions on this word, else
-     * do nothing.
-     */
-    private void restartSuggestionsOnWordTouchedByCursor() {
-        // HACK: We may want to special-case some apps that exhibit bad behavior in case of
-        // recorrection. This is a temporary, stopgap measure that will be removed later.
-        // TODO: remove this.
-        if (mAppWorkAroundsUtils.isBrokenByRecorrection()) return;
-        // A simple way to test for support from the TextView.
-        if (!isSuggestionsStripVisible()) return;
-        // Recorrection is not supported in languages without spaces because we don't know
-        // how to segment them yet.
-        if (!mSettings.getCurrent().mCurrentLanguageHasSpaces) return;
-        // If the cursor is not touching a word, or if there is a selection, return right away.
-        if (mLastSelectionStart != mLastSelectionEnd) return;
-        // If we don't know the cursor location, return.
-        if (mLastSelectionStart < 0) return;
-        final SettingsValues currentSettings = mSettings.getCurrent();
-        if (!mConnection.isCursorTouchingWord(currentSettings)) return;
-        final TextRange range = mConnection.getWordRangeAtCursor(currentSettings.mWordSeparators,
-                0 /* additionalPrecedingWordsCount */);
-        if (null == range) return; // Happens if we don't have an input connection at all
-        if (range.length() <= 0) return; // Race condition. No text to resume on, so bail out.
-        // If for some strange reason (editor bug or so) we measure the text before the cursor as
-        // longer than what the entire text is supposed to be, the safe thing to do is bail out.
-        final int numberOfCharsInWordBeforeCursor = range.getNumberOfCharsInWordBeforeCursor();
-        if (numberOfCharsInWordBeforeCursor > mLastSelectionStart) return;
-        final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
-        final String typedWord = range.mWord.toString();
-        if (!isResumableWord(typedWord, currentSettings)) return;
-        int i = 0;
-        for (final SuggestionSpan span : range.getSuggestionSpansAtWord()) {
-            for (final String s : span.getSuggestions()) {
-                ++i;
-                if (!TextUtils.equals(s, typedWord)) {
-                    suggestions.add(new SuggestedWordInfo(s,
-                            SuggestionStripView.MAX_SUGGESTIONS - i,
-                            SuggestedWordInfo.KIND_RESUMED, Dictionary.DICTIONARY_RESUMED,
-                            SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */,
-                            SuggestedWordInfo.NOT_A_CONFIDENCE
-                                    /* autoCommitFirstWordConfidence */));
-                }
-            }
-        }
-        mWordComposer.setComposingWord(typedWord, mKeyboardSwitcher.getKeyboard());
-        mWordComposer.setCursorPositionWithinWord(
-                typedWord.codePointCount(0, numberOfCharsInWordBeforeCursor));
-        mConnection.setComposingRegion(
-                mLastSelectionStart - numberOfCharsInWordBeforeCursor,
-                mLastSelectionEnd + range.getNumberOfCharsInWordAfterCursor());
-        if (suggestions.isEmpty()) {
-            // We come here if there weren't any suggestion spans on this word. We will try to
-            // compute suggestions for it instead.
-            mInputUpdater.getSuggestedWords(Suggest.SESSION_TYPING,
-                    SuggestedWords.NOT_A_SEQUENCE_NUMBER, new OnGetSuggestedWordsCallback() {
-                        @Override
-                        public void onGetSuggestedWords(
-                                final SuggestedWords suggestedWordsIncludingTypedWord) {
-                            final SuggestedWords suggestedWords;
-                            if (suggestedWordsIncludingTypedWord.size() > 1) {
-                                // We were able to compute new suggestions for this word.
-                                // Remove the typed word, since we don't want to display it in this
-                                // case. The #getSuggestedWordsExcludingTypedWord() method sets
-                                // willAutoCorrect to false.
-                                suggestedWords = suggestedWordsIncludingTypedWord
-                                        .getSuggestedWordsExcludingTypedWord();
-                            } else {
-                                // No saved suggestions, and we were unable to compute any good one
-                                // either. Rather than displaying an empty suggestion strip, we'll
-                                // display the original word alone in the middle.
-                                // Since there is only one word, willAutoCorrect is false.
-                                suggestedWords = suggestedWordsIncludingTypedWord;
-                            }
-                            // We need to pass typedWord because mWordComposer.mTypedWord may
-                            // differ from typedWord.
-                            unsetIsAutoCorrectionIndicatorOnAndCallShowSuggestionStrip(
-                                    suggestedWords, typedWord);
-                        }});
-        } else {
-            // We found suggestion spans in the word. We'll create the SuggestedWords out of
-            // them, and make willAutoCorrect false.
-            final SuggestedWords suggestedWords = new SuggestedWords(suggestions,
-                    true /* typedWordValid */, false /* willAutoCorrect */,
-                    false /* isPunctuationSuggestions */, false /* isObsoleteSuggestions */,
-                    false /* isPrediction */);
-            // We need to pass typedWord because mWordComposer.mTypedWord may differ from typedWord.
-            unsetIsAutoCorrectionIndicatorOnAndCallShowSuggestionStrip(suggestedWords, typedWord);
-        }
-    }
-
     public void unsetIsAutoCorrectionIndicatorOnAndCallShowSuggestionStrip(
             final SuggestedWords suggestedWords, final String typedWord) {
         // Note that it's very important here that suggestedWords.mWillAutoCorrect is false.
@@ -2955,127 +1578,10 @@
         // We also need to unset mIsAutoCorrectionIndicatorOn to avoid showSuggestionStrip touching
         // the text to adapt it.
         // TODO: remove mIsAutoCorrectionIndicatorOn (see comment on definition)
-        mIsAutoCorrectionIndicatorOn = false;
+        mInputLogic.mIsAutoCorrectionIndicatorOn = false;
         mHandler.showSuggestionStripWithTypedWord(suggestedWords, typedWord);
     }
 
-    /**
-     * Check if the cursor is actually at the end of a word. If so, restart suggestions on this
-     * word, else do nothing.
-     */
-    private void restartSuggestionsOnWordBeforeCursorIfAtEndOfWord() {
-        final CharSequence word =
-                mConnection.getWordBeforeCursorIfAtEndOfWord(mSettings.getCurrent());
-        if (null != word) {
-            final String wordString = word.toString();
-            restartSuggestionsOnWordBeforeCursor(wordString);
-            // TODO: Handle the case where the user manually moves the cursor and then backs up over
-            // a separator.  In that case, the current log unit should not be uncommitted.
-            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                ResearchLogger.getInstance().uncommitCurrentLogUnit(wordString,
-                        true /* dumpCurrentLogUnit */);
-            }
-        }
-    }
-
-    private void restartSuggestionsOnWordBeforeCursor(final String word) {
-        mWordComposer.setComposingWord(word, mKeyboardSwitcher.getKeyboard());
-        final int length = word.length();
-        mConnection.deleteSurroundingText(length, 0);
-        mConnection.setComposingText(word, 1);
-        mHandler.postUpdateSuggestionStrip();
-    }
-
-    /**
-     * Retry resetting caches in the rich input connection.
-     *
-     * When the editor can't be accessed we can't reset the caches, so we schedule a retry.
-     * This method handles the retry, and re-schedules a new retry if we still can't access.
-     * We only retry up to 5 times before giving up.
-     *
-     * @param tryResumeSuggestions Whether we should resume suggestions or not.
-     * @param remainingTries How many times we may try again before giving up.
-     */
-    private void retryResetCaches(final boolean tryResumeSuggestions, final int remainingTries) {
-        if (!mConnection.resetCachesUponCursorMoveAndReturnSuccess(mLastSelectionStart, false)) {
-            if (0 < remainingTries) {
-                mHandler.postResetCaches(tryResumeSuggestions, remainingTries - 1);
-                return;
-            }
-            // If remainingTries is 0, we should stop waiting for new tries, but it's still
-            // better to load the keyboard (less things will be broken).
-        }
-        tryFixLyingCursorPosition();
-        mKeyboardSwitcher.loadKeyboard(getCurrentInputEditorInfo(), mSettings.getCurrent());
-        if (tryResumeSuggestions) mHandler.postResumeSuggestions();
-    }
-
-    private void revertCommit() {
-        final String previousWord = mLastComposedWord.mPrevWord;
-        final String originallyTypedWord = mLastComposedWord.mTypedWord;
-        final String committedWord = mLastComposedWord.mCommittedWord;
-        final int cancelLength = committedWord.length();
-        // We want java chars, not codepoints for the following.
-        final int separatorLength = mLastComposedWord.mSeparatorString.length();
-        // TODO: should we check our saved separator against the actual contents of the text view?
-        final int deleteLength = cancelLength + separatorLength;
-        if (DEBUG) {
-            if (mWordComposer.isComposingWord()) {
-                throw new RuntimeException("revertCommit, but we are composing a word");
-            }
-            final CharSequence wordBeforeCursor =
-                    mConnection.getTextBeforeCursor(deleteLength, 0)
-                            .subSequence(0, cancelLength);
-            if (!TextUtils.equals(committedWord, wordBeforeCursor)) {
-                throw new RuntimeException("revertCommit check failed: we thought we were "
-                        + "reverting \"" + committedWord
-                        + "\", but before the cursor we found \"" + wordBeforeCursor + "\"");
-            }
-        }
-        mConnection.deleteSurroundingText(deleteLength, 0);
-        if (!TextUtils.isEmpty(previousWord) && !TextUtils.isEmpty(committedWord)) {
-            mUserHistoryDictionary.cancelAddingUserHistory(previousWord, committedWord);
-        }
-        final String stringToCommit = originallyTypedWord + mLastComposedWord.mSeparatorString;
-        if (mSettings.getCurrent().mCurrentLanguageHasSpaces) {
-            // For languages with spaces, we revert to the typed string, but the cursor is still
-            // after the separator so we don't resume suggestions. If the user wants to correct
-            // the word, they have to press backspace again.
-            mConnection.commitText(stringToCommit, 1);
-        } else {
-            // For languages without spaces, we revert the typed string but the cursor is flush
-            // with the typed word, so we need to resume suggestions right away.
-            mWordComposer.setComposingWord(stringToCommit, mKeyboardSwitcher.getKeyboard());
-            mConnection.setComposingText(stringToCommit, 1);
-        }
-        if (mSettings.isInternal()) {
-            LatinImeLoggerUtils.onSeparator(mLastComposedWord.mSeparatorString,
-                    Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
-        }
-        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-            ResearchLogger.latinIME_revertCommit(committedWord, originallyTypedWord,
-                    mWordComposer.isBatchMode(), mLastComposedWord.mSeparatorString);
-        }
-        // Don't restart suggestion yet. We'll restart if the user deletes the
-        // separator.
-        mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
-        // We have a separator between the word and the cursor: we should show predictions.
-        mHandler.postUpdateSuggestionStrip();
-    }
-
-    // This essentially inserts a space, and that's it.
-    public void promotePhantomSpace() {
-        final SettingsValues currentSettings = mSettings.getCurrent();
-        if (currentSettings.shouldInsertSpacesAutomatically()
-                && currentSettings.mCurrentLanguageHasSpaces
-                && !mConnection.textBeforeCursorLooksLikeURL()) {
-            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                ResearchLogger.latinIME_promotePhantomSpace();
-            }
-            sendKeyCodePoint(Constants.CODE_SPACE);
-        }
-    }
-
     // TODO: Make this private
     // Outside LatinIME, only used by the {@link InputTestsBase} test suite.
     @UsedForTesting
@@ -3095,12 +1601,12 @@
 
     private void hapticAndAudioFeedback(final int code, final int repeatCount) {
         final MainKeyboardView keyboardView = mKeyboardSwitcher.getMainKeyboardView();
-        if (keyboardView != null && keyboardView.isInSlidingKeyInput()) {
-            // No need to feedback while sliding input.
+        if (keyboardView != null && keyboardView.isInDraggingFinger()) {
+            // No need to feedback while finger is dragging.
             return;
         }
         if (repeatCount > 0) {
-            if (code == Constants.CODE_DELETE && !mConnection.canDeleteCharacters()) {
+            if (code == Constants.CODE_DELETE && !mInputLogic.mConnection.canDeleteCharacters()) {
                 // No need to feedback when repeat delete key will have no effect.
                 return;
             }
@@ -3154,9 +1660,9 @@
         // onHardwareKeyEvent, like onKeyDown returns true if it handled the event, false if
         // it doesn't know what to do with it and leave it to the application. For example,
         // hardware key events for adjusting the screen's brightness are passed as is.
-        if (mEventInterpreter.onHardwareKeyEvent(event)) {
+        if (mInputLogic.mEventInterpreter.onHardwareKeyEvent(event)) {
             final long keyIdentifier = event.getDeviceId() << 32 + event.getKeyCode();
-            mCurrentlyPressedHardwareKeys.add(keyIdentifier);
+            mInputLogic.mCurrentlyPressedHardwareKeys.add(keyIdentifier);
             return true;
         }
         return super.onKeyDown(keyCode, event);
@@ -3165,7 +1671,7 @@
     @Override
     public boolean onKeyUp(final int keyCode, final KeyEvent event) {
         final long keyIdentifier = event.getDeviceId() << 32 + event.getKeyCode();
-        if (mCurrentlyPressedHardwareKeys.remove(keyIdentifier)) {
+        if (mInputLogic.mCurrentlyPressedHardwareKeys.remove(keyIdentifier)) {
             return true;
         }
         return super.onKeyUp(keyCode, event);
@@ -3190,14 +1696,19 @@
     };
 
     private void launchSettings() {
-        handleClose();
+        mInputLogic.commitTyped(mSettings.getCurrent(), LastComposedWord.NOT_A_SEPARATOR);
+        requestHideSelf(0);
+        final MainKeyboardView mainKeyboardView = mKeyboardSwitcher.getMainKeyboardView();
+        if (mainKeyboardView != null) {
+            mainKeyboardView.closing();
+        }
         launchSubActivity(SettingsActivity.class);
     }
 
     public void launchKeyboardedDialogActivity(final Class<? extends Activity> activityClass) {
         // Put the text in the attached EditText into a safe, saved state before switching to a
         // new activity that will also use the soft keyboard.
-        commitTyped(LastComposedWord.NOT_A_SEPARATOR);
+        mInputLogic.commitTyped(mSettings.getCurrent(), LastComposedWord.NOT_A_SEPARATOR);
         launchSubActivity(activityClass);
     }
 
@@ -3215,7 +1726,7 @@
         final CharSequence[] items = new CharSequence[] {
                 // TODO: Should use new string "Select active input modes".
                 getString(R.string.language_selection_title),
-                getString(ApplicationUtils.getAcitivityTitleResId(this, SettingsActivity.class)),
+                getString(ApplicationUtils.getActivityTitleResId(this, SettingsActivity.class)),
         };
         final DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {
             @Override
@@ -3226,8 +1737,8 @@
                     final Intent intent = IntentUtils.getInputLanguageSelectionIntent(
                             mRichImm.getInputMethodIdOfThisIme(),
                             Intent.FLAG_ACTIVITY_NEW_TASK
-                            | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
-                            | Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                                    | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED
+                                    | Intent.FLAG_ACTIVITY_CLEAR_TOP);
                     startActivity(intent);
                     break;
                 case 1:
@@ -3236,9 +1747,8 @@
                 }
             }
         };
-        final AlertDialog.Builder builder = new AlertDialog.Builder(this)
-                .setItems(items, listener)
-                .setTitle(title);
+        final AlertDialog.Builder builder =
+                new AlertDialog.Builder(this).setItems(items, listener).setTitle(title);
         showOptionDialog(builder.create());
     }
 
@@ -3264,31 +1774,27 @@
 
     // TODO: can this be removed somehow without breaking the tests?
     @UsedForTesting
-    /* package for test */ String getFirstSuggestedWord() {
-        return mSuggestedWords.size() > 0 ? mSuggestedWords.getWord(0) : null;
+    /* package for test */ SuggestedWords getSuggestedWords() {
+        // You may not use this method for anything else than debug
+        return DEBUG ? mInputLogic.mSuggestedWords : null;
     }
 
     // DO NOT USE THIS for any other purpose than testing. This is information private to LatinIME.
     @UsedForTesting
     /* package for test */ boolean isCurrentlyWaitingForMainDictionary() {
-        return mSuggest.isCurrentlyWaitingForMainDictionary();
-    }
-
-    // DO NOT USE THIS for any other purpose than testing. This is information private to LatinIME.
-    @UsedForTesting
-    /* package for test */ boolean hasMainDictionary() {
-        return mSuggest.hasMainDictionary();
+        return mInputLogic.mSuggest.mDictionaryFacilitator.isCurrentlyWaitingForMainDictionary();
     }
 
     // DO NOT USE THIS for any other purpose than testing. This can break the keyboard badly.
     @UsedForTesting
     /* package for test */ void replaceMainDictionaryForTest(final Locale locale) {
-        mSuggest.resetMainDict(this, locale, null);
+        mInputLogic.mSuggest.mDictionaryFacilitator.reloadMainDict(this, locale, null);
     }
 
     public void debugDumpStateAndCrashWithException(final String context) {
-        final StringBuilder s = new StringBuilder(mAppWorkAroundsUtils.toString());
-        s.append("\nAttributes : ").append(mSettings.getCurrent().mInputAttributes)
+        final SettingsValues settingsValues = mSettings.getCurrent();
+        final StringBuilder s = new StringBuilder(settingsValues.toString());
+        s.append("\nAttributes : ").append(settingsValues.mInputAttributes)
                 .append("\nContext : ").append(context);
         throw new RuntimeException(s.toString());
     }
@@ -3299,17 +1805,19 @@
 
         final Printer p = new PrintWriterPrinter(fout);
         p.println("LatinIME state :");
+        p.println("  VersionCode = " + ApplicationUtils.getVersionCode(this));
+        p.println("  VersionName = " + ApplicationUtils.getVersionName(this));
         final Keyboard keyboard = mKeyboardSwitcher.getKeyboard();
         final int keyboardMode = keyboard != null ? keyboard.mId.mMode : -1;
         p.println("  Keyboard mode = " + keyboardMode);
         final SettingsValues settingsValues = mSettings.getCurrent();
-        p.println("  mIsSuggestionsSuggestionsRequested = "
-                + settingsValues.isSuggestionsRequested(mDisplayOrientation));
+        p.println("  mIsSuggestionsRequested = " + settingsValues.isSuggestionsRequested());
         p.println("  mCorrectionEnabled=" + settingsValues.mCorrectionEnabled);
-        p.println("  isComposingWord=" + mWordComposer.isComposingWord());
+        p.println("  isComposingWord=" + mInputLogic.mWordComposer.isComposingWord());
         p.println("  mSoundOn=" + settingsValues.mSoundOn);
         p.println("  mVibrateOn=" + settingsValues.mVibrateOn);
         p.println("  mKeyPreviewPopupOn=" + settingsValues.mKeyPreviewPopupOn);
         p.println("  inputAttributes=" + settingsValues.mInputAttributes);
+        // TODO: Dump all settings values
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/RichInputConnection.java b/java/src/com/android/inputmethod/latin/RichInputConnection.java
index 673d1b4..4d174dd 100644
--- a/java/src/com/android/inputmethod/latin/RichInputConnection.java
+++ b/java/src/com/android/inputmethod/latin/RichInputConnection.java
@@ -57,14 +57,19 @@
     private static final int INVALID_CURSOR_POSITION = -1;
 
     /**
-     * This variable contains an expected value for the cursor position. This is where the
-     * cursor may end up after all the keyboard-triggered updates have passed. We keep this to
-     * compare it to the actual cursor position to guess whether the move was caused by a
-     * keyboard command or not.
-     * It's not really the cursor position: the cursor may not be there yet, and it's also expected
-     * there be cases where it never actually comes to be there.
+     * This variable contains an expected value for the selection start position. This is where the
+     * cursor or selection start may end up after all the keyboard-triggered updates have passed. We
+     * keep this to compare it to the actual selection start to guess whether the move was caused by
+     * a keyboard command or not.
+     * It's not really the selection start position: the selection start may not be there yet, and
+     * in some cases, it may never arrive there.
      */
-    private int mExpectedCursorPosition = INVALID_CURSOR_POSITION; // in chars, not code points
+    private int mExpectedSelStart = INVALID_CURSOR_POSITION; // in chars, not code points
+    /**
+     * The expected selection end.  Only differs from mExpectedSelStart if a non-empty selection is
+     * expected.  The same caveats as mExpectedSelStart apply.
+     */
+    private int mExpectedSelEnd = INVALID_CURSOR_POSITION; // in chars, not code points
     /**
      * This contains the committed text immediately preceding the cursor and the composing
      * text if any. It is refreshed when the cursor moves by calling upon the TextView.
@@ -103,16 +108,16 @@
         final String reference = (beforeCursor.length() <= actualLength) ? beforeCursor.toString()
                 : beforeCursor.subSequence(beforeCursor.length() - actualLength,
                         beforeCursor.length()).toString();
-        if (et.selectionStart != mExpectedCursorPosition
+        if (et.selectionStart != mExpectedSelStart
                 || !(reference.equals(internal.toString()))) {
-            final String context = "Expected cursor position = " + mExpectedCursorPosition
-                    + "\nActual cursor position = " + et.selectionStart
+            final String context = "Expected selection start = " + mExpectedSelStart
+                    + "\nActual selection start = " + et.selectionStart
                     + "\nExpected text = " + internal.length() + " " + internal
                     + "\nActual text = " + reference.length() + " " + reference;
             ((LatinIME)mParent).debugDumpStateAndCrashWithException(context);
         } else {
             Log.e(TAG, DebugLogUtils.getStackTrace(2));
-            Log.e(TAG, "Exp <> Actual : " + mExpectedCursorPosition + " <> " + et.selectionStart);
+            Log.e(TAG, "Exp <> Actual : " + mExpectedSelStart + " <> " + et.selectionStart);
         }
     }
 
@@ -150,16 +155,50 @@
      * data, so we empty the cache and note that we don't know the new cursor position, and we
      * return false so that the caller knows about this and can retry later.
      *
-     * @param newCursorPosition The new position of the cursor, as received from the system.
-     * @param shouldFinishComposition Whether we should finish the composition in progress.
+     * @param newSelStart the new position of the selection start, as received from the system.
+     * @param newSelEnd the new position of the selection end, as received from the system.
+     * @param shouldFinishComposition whether we should finish the composition in progress.
      * @return true if we were able to connect to the editor successfully, false otherwise. When
      *   this method returns false, the caches could not be correctly refreshed so they were only
      *   reset: the caller should try again later to return to normal operation.
      */
-    public boolean resetCachesUponCursorMoveAndReturnSuccess(final int newCursorPosition,
-            final boolean shouldFinishComposition) {
-        mExpectedCursorPosition = newCursorPosition;
+    public boolean resetCachesUponCursorMoveAndReturnSuccess(final int newSelStart,
+            final int newSelEnd, final boolean shouldFinishComposition) {
+        mExpectedSelStart = newSelStart;
+        mExpectedSelEnd = newSelEnd;
         mComposingText.setLength(0);
+        final boolean didReloadTextSuccessfully = reloadTextCache();
+        if (!didReloadTextSuccessfully) {
+            Log.d(TAG, "Will try to retrieve text later.");
+            return false;
+        }
+        final int lengthOfTextBeforeCursor = mCommittedTextBeforeComposingText.length();
+        if (lengthOfTextBeforeCursor > newSelStart
+                || (lengthOfTextBeforeCursor < Constants.EDITOR_CONTENTS_CACHE_SIZE
+                        && newSelStart < Constants.EDITOR_CONTENTS_CACHE_SIZE)) {
+            // newSelStart and newSelEnd may be lying -- when rotating the device (probably a
+            // framework bug). If we have less chars than we asked for, then we know how many chars
+            // we have, and if we got more than newSelStart says, then we know it was lying. In both
+            // cases the length is more reliable.  Note that we only have to check newSelStart (not
+            // newSelEnd) since if newSelEnd is wrong, the newSelStart will be wrong as well.
+            mExpectedSelStart = lengthOfTextBeforeCursor;
+            mExpectedSelEnd = lengthOfTextBeforeCursor;
+        }
+        if (null != mIC && shouldFinishComposition) {
+            mIC.finishComposingText();
+            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                ResearchLogger.richInputConnection_finishComposingText();
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Reload the cached text from the InputConnection.
+     *
+     * @return true if successful
+     */
+    private boolean reloadTextCache() {
         mCommittedTextBeforeComposingText.setLength(0);
         mIC = mParent.getCurrentInputConnection();
         // Call upon the inputconnection directly since our own method is using the cache, and
@@ -169,27 +208,12 @@
         if (null == textBeforeCursor) {
             // For some reason the app thinks we are not connected to it. This looks like a
             // framework bug... Fall back to ground state and return false.
-            mExpectedCursorPosition = INVALID_CURSOR_POSITION;
-            Log.e(TAG, "Unable to connect to the editor to retrieve text... will retry later");
+            mExpectedSelStart = INVALID_CURSOR_POSITION;
+            mExpectedSelEnd = INVALID_CURSOR_POSITION;
+            Log.e(TAG, "Unable to connect to the editor to retrieve text.");
             return false;
         }
         mCommittedTextBeforeComposingText.append(textBeforeCursor);
-        final int lengthOfTextBeforeCursor = textBeforeCursor.length();
-        if (lengthOfTextBeforeCursor > newCursorPosition
-                || (lengthOfTextBeforeCursor < Constants.EDITOR_CONTENTS_CACHE_SIZE
-                        && newCursorPosition < Constants.EDITOR_CONTENTS_CACHE_SIZE)) {
-            // newCursorPosition may be lying -- when rotating the device (probably a framework
-            // bug). If we have less chars than we asked for, then we know how many chars we have,
-            // and if we got more than newCursorPosition says, then we know it was lying. In both
-            // cases the length is more reliable
-            mExpectedCursorPosition = lengthOfTextBeforeCursor;
-        }
-        if (null != mIC && shouldFinishComposition) {
-            mIC.finishComposingText();
-            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                ResearchLogger.richInputConnection_finishComposingText();
-            }
-        }
         return true;
     }
 
@@ -218,7 +242,8 @@
         if (DEBUG_BATCH_NESTING) checkBatchEdit();
         if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
         mCommittedTextBeforeComposingText.append(text);
-        mExpectedCursorPosition += text.length() - mComposingText.length();
+        mExpectedSelStart += text.length() - mComposingText.length();
+        mExpectedSelEnd = mExpectedSelStart;
         mComposingText.setLength(0);
         if (null != mIC) {
             mIC.commitText(text, i);
@@ -231,7 +256,7 @@
     }
 
     public boolean canDeleteCharacters() {
-        return mExpectedCursorPosition > 0;
+        return mExpectedSelStart > 0;
     }
 
     /**
@@ -268,11 +293,10 @@
         // heavy pressing of delete, for example DEFAULT_TEXT_CACHE_SIZE - 5 times or so.
         // getCapsMode should be updated to be able to return a "not enough info" result so that
         // we can get more context only when needed.
-        if (TextUtils.isEmpty(mCommittedTextBeforeComposingText) && 0 != mExpectedCursorPosition) {
-            final CharSequence textBeforeCursor = getTextBeforeCursor(
-                    Constants.EDITOR_CONTENTS_CACHE_SIZE, 0);
-            if (!TextUtils.isEmpty(textBeforeCursor)) {
-                mCommittedTextBeforeComposingText.append(textBeforeCursor);
+        if (TextUtils.isEmpty(mCommittedTextBeforeComposingText) && 0 != mExpectedSelStart) {
+            if (!reloadTextCache()) {
+                Log.w(TAG, "Unable to connect to the editor. "
+                        + "Setting caps mode without knowing text.");
             }
         }
         // This never calls InputConnection#getCapsMode - in fact, it's a static method that
@@ -295,8 +319,8 @@
         // However, if we don't have an expected cursor position, then we should always
         // go fetch the cache again (as it happens, INVALID_CURSOR_POSITION < 0, so we need to
         // test for this explicitly)
-        if (INVALID_CURSOR_POSITION != mExpectedCursorPosition
-                && (cachedLength >= n || cachedLength >= mExpectedCursorPosition)) {
+        if (INVALID_CURSOR_POSITION != mExpectedSelStart
+                && (cachedLength >= n || cachedLength >= mExpectedSelStart)) {
             final StringBuilder s = new StringBuilder(mCommittedTextBeforeComposingText);
             // We call #toString() here to create a temporary object.
             // In some situations, this method is called on a worker thread, and it's possible
@@ -336,10 +360,14 @@
                     + remainingChars, 0);
             mCommittedTextBeforeComposingText.setLength(len);
         }
-        if (mExpectedCursorPosition > beforeLength) {
-            mExpectedCursorPosition -= beforeLength;
+        if (mExpectedSelStart > beforeLength) {
+            mExpectedSelStart -= beforeLength;
+            mExpectedSelEnd -= beforeLength;
         } else {
-            mExpectedCursorPosition = 0;
+            // There are fewer characters before the cursor in the buffer than we are being asked to
+            // delete.  Only delete what is there.
+            mExpectedSelStart = 0;
+            mExpectedSelEnd -= mExpectedSelStart;
         }
         if (null != mIC) {
             mIC.deleteSurroundingText(beforeLength, afterLength);
@@ -373,7 +401,8 @@
             switch (keyEvent.getKeyCode()) {
             case KeyEvent.KEYCODE_ENTER:
                 mCommittedTextBeforeComposingText.append("\n");
-                mExpectedCursorPosition += 1;
+                mExpectedSelStart += 1;
+                mExpectedSelEnd = mExpectedSelStart;
                 break;
             case KeyEvent.KEYCODE_DEL:
                 if (0 == mComposingText.length()) {
@@ -385,18 +414,24 @@
                 } else {
                     mComposingText.delete(mComposingText.length() - 1, mComposingText.length());
                 }
-                if (mExpectedCursorPosition > 0) mExpectedCursorPosition -= 1;
+                if (mExpectedSelStart > 0 && mExpectedSelStart == mExpectedSelEnd) {
+                    // TODO: Handle surrogate pairs.
+                    mExpectedSelStart -= 1;
+                }
+                mExpectedSelEnd = mExpectedSelStart;
                 break;
             case KeyEvent.KEYCODE_UNKNOWN:
                 if (null != keyEvent.getCharacters()) {
                     mCommittedTextBeforeComposingText.append(keyEvent.getCharacters());
-                    mExpectedCursorPosition += keyEvent.getCharacters().length();
+                    mExpectedSelStart += keyEvent.getCharacters().length();
+                    mExpectedSelEnd = mExpectedSelStart;
                 }
                 break;
             default:
-                final String text = new String(new int[] { keyEvent.getUnicodeChar() }, 0, 1);
+                final String text = StringUtils.newSingleCodePointString(keyEvent.getUnicodeChar());
                 mCommittedTextBeforeComposingText.append(text);
-                mExpectedCursorPosition += text.length();
+                mExpectedSelStart += text.length();
+                mExpectedSelEnd = mExpectedSelStart;
                 break;
             }
         }
@@ -430,10 +465,12 @@
     public void setComposingText(final CharSequence text, final int newCursorPosition) {
         if (DEBUG_BATCH_NESTING) checkBatchEdit();
         if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
-        mExpectedCursorPosition += text.length() - mComposingText.length();
+        mExpectedSelStart += text.length() - mComposingText.length();
+        mExpectedSelEnd = mExpectedSelStart;
         mComposingText.setLength(0);
         mComposingText.append(text);
-        // TODO: support values of i != 1. At this time, this is never called with i != 1.
+        // TODO: support values of newCursorPosition != 1. At this time, this is never called with
+        // newCursorPosition != 1.
         if (null != mIC) {
             mIC.setComposingText(text, newCursorPosition);
             if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
@@ -443,19 +480,31 @@
         if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
     }
 
-    public void setSelection(final int start, final int end) {
+    /**
+     * Set the selection of the text editor.
+     *
+     * Calls through to {@link InputConnection#setSelection(int, int)}.
+     *
+     * @param start the character index where the selection should start.
+     * @param end the character index where the selection should end.
+     * @return Returns true on success, false if the input connection is no longer valid either when
+     * setting the selection or when retrieving the text cache at that point.
+     */
+    public boolean setSelection(final int start, final int end) {
         if (DEBUG_BATCH_NESTING) checkBatchEdit();
         if (DEBUG_PREVIOUS_TEXT) checkConsistencyForDebug();
+        mExpectedSelStart = start;
+        mExpectedSelEnd = end;
         if (null != mIC) {
-            mIC.setSelection(start, end);
+            final boolean isIcValid = mIC.setSelection(start, end);
+            if (!isIcValid) {
+                return false;
+            }
             if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
                 ResearchLogger.richInputConnection_setSelection(start, end);
             }
         }
-        mExpectedCursorPosition = start;
-        mCommittedTextBeforeComposingText.setLength(0);
-        mCommittedTextBeforeComposingText.append(
-                getTextBeforeCursor(Constants.EDITOR_CONTENTS_CACHE_SIZE, 0));
+        return reloadTextCache();
     }
 
     public void commitCorrection(final CorrectionInfo correctionInfo) {
@@ -476,7 +525,8 @@
         // text should never be null, but just in case, it's better to insert nothing than to crash
         if (null == text) text = "";
         mCommittedTextBeforeComposingText.append(text);
-        mExpectedCursorPosition += text.length() - mComposingText.length();
+        mExpectedSelStart += text.length() - mComposingText.length();
+        mExpectedSelEnd = mExpectedSelStart;
         mComposingText.setLength(0);
         if (null != mIC) {
             mIC.commitCompletion(completionInfo);
@@ -488,7 +538,7 @@
     }
 
     @SuppressWarnings("unused")
-    public String getNthPreviousWord(final String sentenceSeperators, final int n) {
+    public String getNthPreviousWord(final SettingsValues currentSettingsValues, final int n) {
         mIC = mParent.getCurrentInputConnection();
         if (null == mIC) return null;
         final CharSequence prev = getTextBeforeCursor(LOOKBACK_CHARACTER_NUM, 0);
@@ -507,7 +557,7 @@
                 }
             }
         }
-        return getNthPreviousWord(prev, sentenceSeperators, n);
+        return getNthPreviousWord(prev, currentSettingsValues, n);
     }
 
     private static boolean isSeparator(int code, String sep) {
@@ -531,7 +581,7 @@
     // (n = 2) "abc |" -> null
     // (n = 2) "abc. def|" -> null
     public static String getNthPreviousWord(final CharSequence prev,
-            final String sentenceSeperators, final int n) {
+            final SettingsValues currentSettingsValues, final int n) {
         if (prev == null) return null;
         final String[] w = spaceRegex.split(prev);
 
@@ -543,7 +593,8 @@
 
         // If ends in a separator, return null
         final char lastChar = nthPrevWord.charAt(length - 1);
-        if (sentenceSeperators.contains(String.valueOf(lastChar))) return null;
+        if (currentSettingsValues.isWordSeparator(lastChar)
+                || currentSettingsValues.isWordConnector(lastChar)) return null;
 
         return nthPrevWord;
     }
@@ -655,45 +706,6 @@
         return TextUtils.equals(text, beforeText);
     }
 
-    /* (non-javadoc)
-     * Returns the word before the cursor if the cursor is at the end of a word, null otherwise
-     */
-    public CharSequence getWordBeforeCursorIfAtEndOfWord(final SettingsValues settings) {
-        // Bail out if the cursor is in the middle of a word (cursor must be followed by whitespace,
-        // separator or end of line/text)
-        // Example: "test|"<EOL> "te|st" get rejected here
-        final CharSequence textAfterCursor = getTextAfterCursor(1, 0);
-        if (!TextUtils.isEmpty(textAfterCursor)
-                && !settings.isWordSeparator(textAfterCursor.charAt(0))) return null;
-
-        // Bail out if word before cursor is 0-length or a single non letter (like an apostrophe)
-        // Example: " -|" gets rejected here but "e-|" and "e|" are okay
-        CharSequence word = getWordAtCursor(settings.mWordSeparators);
-        // We don't suggest on leading single quotes, so we have to remove them from the word if
-        // it starts with single quotes.
-        while (!TextUtils.isEmpty(word) && Constants.CODE_SINGLE_QUOTE == word.charAt(0)) {
-            word = word.subSequence(1, word.length());
-        }
-        if (TextUtils.isEmpty(word)) return null;
-        // Find the last code point of the string
-        final int lastCodePoint = Character.codePointBefore(word, word.length());
-        // If for some reason the text field contains non-unicode binary data, or if the
-        // charsequence is exactly one char long and the contents is a low surrogate, return null.
-        if (!Character.isDefined(lastCodePoint)) return null;
-        // Bail out if the cursor is not at the end of a word (cursor must be preceded by
-        // non-whitespace, non-separator, non-start-of-text)
-        // Example ("|" is the cursor here) : <SOL>"|a" " |a" " | " all get rejected here.
-        if (settings.isWordSeparator(lastCodePoint)) return null;
-        final char firstChar = word.charAt(0); // we just tested that word is not empty
-        if (word.length() == 1 && !Character.isLetter(firstChar)) return null;
-
-        // We don't restart suggestion if the first character is not a letter, because we don't
-        // start composing when the first character is not a letter.
-        if (!Character.isLetter(firstChar)) return null;
-
-        return word;
-    }
-
     public boolean revertDoubleSpacePeriod() {
         if (DEBUG_BATCH_NESTING) checkBatchEdit();
         // Here we test whether we indeed have a period and a space before us. This should not
@@ -758,20 +770,30 @@
      * this update and not the ones in-between. This is almost impossible to achieve even trying
      * very very hard.
      *
-     * @param oldSelStart The value of the old cursor position in the update.
-     * @param newSelStart The value of the new cursor position in the update.
+     * @param oldSelStart The value of the old selection in the update.
+     * @param newSelStart The value of the new selection in the update.
+     * @param oldSelEnd The value of the old selection end in the update.
+     * @param newSelEnd The value of the new selection end in the update.
      * @return whether this is a belated expected update or not.
      */
-    public boolean isBelatedExpectedUpdate(final int oldSelStart, final int newSelStart) {
-        // If this is an update that arrives at our expected position, it's a belated update.
-        if (newSelStart == mExpectedCursorPosition) return true;
-        // If this is an update that moves the cursor from our expected position, it must be
-        // an explicit move.
-        if (oldSelStart == mExpectedCursorPosition) return false;
-        // The following returns true if newSelStart is between oldSelStart and
-        // mCurrentCursorPosition. We assume that if the updated position is between the old
-        // position and the expected position, then it must be a belated update.
-        return (newSelStart - oldSelStart) * (mExpectedCursorPosition - newSelStart) >= 0;
+    public boolean isBelatedExpectedUpdate(final int oldSelStart, final int newSelStart,
+            final int oldSelEnd, final int newSelEnd) {
+        // This update is "belated" if we are expecting it.  That is, mExpectedSelStart and
+        // mExpectedSelEnd match the new values that the TextView is updating TO.
+        if (mExpectedSelStart == newSelStart && mExpectedSelEnd == newSelEnd) return true;
+        // This update is not belated if mExpectedSelStart and mExpeectedSelend match the old
+        // values, and one of newSelStart or newSelEnd is updated to a different value.  In this
+        // case, there is likely something other than the IME that has moved the selection endpoint
+        // to the new value.
+        if (mExpectedSelStart == oldSelStart && mExpectedSelEnd == oldSelEnd
+                && (oldSelStart != newSelStart || oldSelEnd != newSelEnd)) return false;
+        // If nether of the above two cases holds, then the system may be having trouble keeping up
+        // with updates.  If 1) the selection is a cursor, 2) newSelStart is between oldSelStart
+        // and mExpectedSelStart, and 3) newSelEnd is between oldSelEnd and mExpectedSelEnd, then
+        // assume a belated update.
+        return (newSelStart == newSelEnd)
+                && (newSelStart - oldSelStart) * (mExpectedSelStart - newSelStart) >= 0
+                && (newSelEnd - oldSelEnd) * (mExpectedSelEnd - newSelEnd) >= 0;
     }
 
     /**
diff --git a/java/src/com/android/inputmethod/latin/SubtypeSwitcher.java b/java/src/com/android/inputmethod/latin/SubtypeSwitcher.java
index cd9c89f..860575a 100644
--- a/java/src/com/android/inputmethod/latin/SubtypeSwitcher.java
+++ b/java/src/com/android/inputmethod/latin/SubtypeSwitcher.java
@@ -32,7 +32,9 @@
 import android.view.inputmethod.InputMethodSubtype;
 
 import com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.compat.InputMethodSubtypeCompatUtils;
 import com.android.inputmethod.keyboard.KeyboardSwitcher;
+import com.android.inputmethod.latin.utils.LocaleUtils;
 import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
 
 import java.util.List;
@@ -56,23 +58,34 @@
     private InputMethodSubtype mEmojiSubtype;
     private boolean mIsNetworkConnected;
 
+    private static final String KEYBOARD_MODE = "keyboard";
     // Dummy no language QWERTY subtype. See {@link R.xml.method}.
-    private static final InputMethodSubtype DUMMY_NO_LANGUAGE_SUBTYPE = new InputMethodSubtype(
-            R.string.subtype_no_language_qwerty, R.drawable.ic_ime_switcher_dark,
-            SubtypeLocaleUtils.NO_LANGUAGE, "keyboard", "KeyboardLayoutSet="
-                    + SubtypeLocaleUtils.QWERTY
-                    + "," + Constants.Subtype.ExtraValue.ASCII_CAPABLE
-                    + ",EnabledWhenDefaultIsNotAsciiCapable,"
-                    + Constants.Subtype.ExtraValue.EMOJI_CAPABLE,
-            false /* isAuxiliary */, false /* overridesImplicitlyEnabledSubtype */);
+    private static final int SUBTYPE_ID_OF_DUMMY_NO_LANGUAGE_SUBTYPE = 0xdde0bfd3;
+    private static final String EXTRA_VALUE_OF_DUMMY_NO_LANGUAGE_SUBTYPE =
+            "KeyboardLayoutSet=" + SubtypeLocaleUtils.QWERTY
+            + "," + Constants.Subtype.ExtraValue.ASCII_CAPABLE
+            + "," + Constants.Subtype.ExtraValue.ENABLED_WHEN_DEFAULT_IS_NOT_ASCII_CAPABLE
+            + "," + Constants.Subtype.ExtraValue.EMOJI_CAPABLE;
+    private static final InputMethodSubtype DUMMY_NO_LANGUAGE_SUBTYPE =
+            InputMethodSubtypeCompatUtils.newInputMethodSubtype(
+                    R.string.subtype_no_language_qwerty, R.drawable.ic_ime_switcher_dark,
+                    SubtypeLocaleUtils.NO_LANGUAGE, KEYBOARD_MODE,
+                    EXTRA_VALUE_OF_DUMMY_NO_LANGUAGE_SUBTYPE,
+                    false /* isAuxiliary */, false /* overridesImplicitlyEnabledSubtype */,
+                    SUBTYPE_ID_OF_DUMMY_NO_LANGUAGE_SUBTYPE);
     // Caveat: We probably should remove this when we add an Emoji subtype in {@link R.xml.method}.
     // Dummy Emoji subtype. See {@link R.xml.method}.
-    private static final InputMethodSubtype DUMMY_EMOJI_SUBTYPE = new InputMethodSubtype(
-            R.string.subtype_emoji, R.drawable.ic_ime_switcher_dark,
-            SubtypeLocaleUtils.NO_LANGUAGE, "keyboard", "KeyboardLayoutSet="
-                    + SubtypeLocaleUtils.EMOJI + ","
-                    + Constants.Subtype.ExtraValue.EMOJI_CAPABLE,
-            false /* isAuxiliary */, false /* overridesImplicitlyEnabledSubtype */);
+    private static final int SUBTYPE_ID_OF_DUMMY_EMOJI_SUBTYPE = 0xd78b2ed0;
+    private static final String EXTRA_VALUE_OF_DUMMY_EMOJI_SUBTYPE =
+            "KeyboardLayoutSet=" + SubtypeLocaleUtils.EMOJI
+            + "," + Constants.Subtype.ExtraValue.EMOJI_CAPABLE;
+    private static final InputMethodSubtype DUMMY_EMOJI_SUBTYPE =
+            InputMethodSubtypeCompatUtils.newInputMethodSubtype(
+                    R.string.subtype_emoji, R.drawable.ic_ime_switcher_dark,
+                    SubtypeLocaleUtils.NO_LANGUAGE, KEYBOARD_MODE,
+                    EXTRA_VALUE_OF_DUMMY_EMOJI_SUBTYPE,
+                    false /* isAuxiliary */, false /* overridesImplicitlyEnabledSubtype */,
+                    SUBTYPE_ID_OF_DUMMY_EMOJI_SUBTYPE);
 
     static final class NeedsToDisplayLanguage {
         private int mEnabledSubtypeCount;
@@ -213,6 +226,7 @@
     }
 
     public boolean isShortcutImeEnabled() {
+        updateShortcutIME();
         if (mShortcutInputMethodInfo == null) {
             return false;
         }
@@ -224,10 +238,13 @@
     }
 
     public boolean isShortcutImeReady() {
-        if (mShortcutInputMethodInfo == null)
+        updateShortcutIME();
+        if (mShortcutInputMethodInfo == null) {
             return false;
-        if (mShortcutSubtype == null)
+        }
+        if (mShortcutSubtype == null) {
             return true;
+        }
         if (mShortcutSubtype.containsExtraValueKey(REQ_NETWORK_CONNECTIVITY)) {
             return mIsNetworkConnected;
         }
@@ -256,18 +273,35 @@
         return mNeedsToDisplayLanguage.getValue();
     }
 
-    private static Locale sForcedLocaleForTesting = null;
+    public boolean isSystemLocaleSameAsLocaleOfAllEnabledSubtypes() {
+        final Locale systemLocale = mResources.getConfiguration().locale;
+        final List<InputMethodSubtype> enabledSubtypesOfThisIme =
+                mRichImm.getMyEnabledInputMethodSubtypeList(true);
+        for (final InputMethodSubtype subtype : enabledSubtypesOfThisIme) {
+            if (!systemLocale.equals(SubtypeLocaleUtils.getSubtypeLocale(subtype))) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private static InputMethodSubtype sForcedSubtypeForTesting = null;
     @UsedForTesting
-    void forceLocale(final Locale locale) {
-        sForcedLocaleForTesting = locale;
+    void forceSubtype(final InputMethodSubtype subtype) {
+        sForcedSubtypeForTesting = subtype;
     }
 
     public Locale getCurrentSubtypeLocale() {
-        if (null != sForcedLocaleForTesting) return sForcedLocaleForTesting;
+        if (null != sForcedSubtypeForTesting) {
+            return LocaleUtils.constructLocaleFromString(sForcedSubtypeForTesting.getLocale());
+        }
         return SubtypeLocaleUtils.getSubtypeLocale(getCurrentSubtype());
     }
 
     public InputMethodSubtype getCurrentSubtype() {
+        if (null != sForcedSubtypeForTesting) {
+            return sForcedSubtypeForTesting;
+        }
         return mRichImm.getCurrentInputMethodSubtype(getNoLanguageSubtype());
     }
 
@@ -279,8 +313,8 @@
         if (mNoLanguageSubtype != null) {
             return mNoLanguageSubtype;
         }
-        Log.w(TAG, "Can't find no lanugage with QWERTY subtype");
-        Log.w(TAG, "No input method subtype found; return dummy subtype: "
+        Log.w(TAG, "Can't find any language with QWERTY subtype");
+        Log.w(TAG, "No input method subtype found; returning dummy subtype: "
                 + DUMMY_NO_LANGUAGE_SUBTYPE);
         return DUMMY_NO_LANGUAGE_SUBTYPE;
     }
@@ -293,8 +327,9 @@
         if (mEmojiSubtype != null) {
             return mEmojiSubtype;
         }
-        Log.w(TAG, "Can't find Emoji subtype");
-        Log.w(TAG, "No input method subtype found; return dummy subtype: " + DUMMY_EMOJI_SUBTYPE);
+        Log.w(TAG, "Can't find emoji subtype");
+        Log.w(TAG, "No input method subtype found; returning dummy subtype: "
+                + DUMMY_EMOJI_SUBTYPE);
         return DUMMY_EMOJI_SUBTYPE;
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index 0a4c7a5..fc85c13 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -16,18 +16,10 @@
 
 package com.android.inputmethod.latin;
 
-import android.content.Context;
-import android.preference.PreferenceManager;
 import android.text.TextUtils;
-import android.util.Log;
 
-import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
-import com.android.inputmethod.latin.personalization.PersonalizationDictionary;
-import com.android.inputmethod.latin.personalization.PersonalizationPredictionDictionary;
-import com.android.inputmethod.latin.personalization.UserHistoryDictionary;
-import com.android.inputmethod.latin.settings.Settings;
 import com.android.inputmethod.latin.utils.AutoCorrectionUtils;
 import com.android.inputmethod.latin.utils.BoundedTreeSet;
 import com.android.inputmethod.latin.utils.CollectionUtils;
@@ -35,9 +27,7 @@
 
 import java.util.ArrayList;
 import java.util.Comparator;
-import java.util.HashSet;
 import java.util.Locale;
-import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * This class loads a dictionary and provides a list of suggestions for a given sequence of
@@ -62,148 +52,27 @@
 
     public static final int MAX_SUGGESTIONS = 18;
 
-    public interface SuggestInitializationListener {
-        public void onUpdateMainDictionaryAvailability(boolean isMainDictionaryAvailable);
-    }
-
     private static final boolean DBG = LatinImeLogger.sDBG;
 
-    private final ConcurrentHashMap<String, Dictionary> mDictionaries =
-            CollectionUtils.newConcurrentHashMap();
-    private HashSet<String> mOnlyDictionarySetForDebug = null;
-    private Dictionary mMainDictionary;
-    private ContactsBinaryDictionary mContactsDict;
-    @UsedForTesting
-    private boolean mIsCurrentlyWaitingForMainDictionary = false;
+    public final DictionaryFacilitatorForSuggest mDictionaryFacilitator;
 
     private float mAutoCorrectionThreshold;
 
     // Locale used for upper- and title-casing words
     public final Locale mLocale;
 
-    public Suggest(final Context context, final Locale locale,
-            final SuggestInitializationListener listener) {
-        initAsynchronously(context, locale, listener);
+    public Suggest(final Locale locale,
+            final DictionaryFacilitatorForSuggest dictionaryFacilitator) {
         mLocale = locale;
-        // initialize a debug flag for the personalization
-        if (Settings.readUseOnlyPersonalizationDictionaryForDebug(
-                PreferenceManager.getDefaultSharedPreferences(context))) {
-            mOnlyDictionarySetForDebug = new HashSet<String>();
-            mOnlyDictionarySetForDebug.add(Dictionary.TYPE_PERSONALIZATION);
-            mOnlyDictionarySetForDebug.add(Dictionary.TYPE_PERSONALIZATION_PREDICTION_IN_JAVA);
-        }
+        mDictionaryFacilitator = dictionaryFacilitator;
     }
 
-    @UsedForTesting
-    Suggest(final AssetFileAddress[] dictionaryList, final Locale locale) {
-        final Dictionary mainDict = DictionaryFactory.createDictionaryForTest(dictionaryList,
-                false /* useFullEditDistance */, locale);
-        mLocale = locale;
-        mMainDictionary = mainDict;
-        addOrReplaceDictionaryInternal(Dictionary.TYPE_MAIN, mainDict);
-    }
-
-    private void initAsynchronously(final Context context, final Locale locale,
-            final SuggestInitializationListener listener) {
-        resetMainDict(context, locale, listener);
-    }
-
-    private void addOrReplaceDictionaryInternal(final String key, final Dictionary dict) {
-        if (mOnlyDictionarySetForDebug != null && !mOnlyDictionarySetForDebug.contains(key)) {
-            Log.w(TAG, "Ignore add " + key + " dictionary for debug.");
-            return;
-        }
-        addOrReplaceDictionary(mDictionaries, key, dict);
-    }
-
-    private static void addOrReplaceDictionary(
-            final ConcurrentHashMap<String, Dictionary> dictionaries,
-            final String key, final Dictionary dict) {
-        final Dictionary oldDict = (dict == null)
-                ? dictionaries.remove(key)
-                : dictionaries.put(key, dict);
-        if (oldDict != null && dict != oldDict) {
-            oldDict.close();
-        }
-    }
-
-    public void resetMainDict(final Context context, final Locale locale,
-            final SuggestInitializationListener listener) {
-        mIsCurrentlyWaitingForMainDictionary = true;
-        mMainDictionary = null;
-        if (listener != null) {
-            listener.onUpdateMainDictionaryAvailability(hasMainDictionary());
-        }
-        new Thread("InitializeBinaryDictionary") {
-            @Override
-            public void run() {
-                final DictionaryCollection newMainDict =
-                        DictionaryFactory.createMainDictionaryFromManager(context, locale);
-                addOrReplaceDictionaryInternal(Dictionary.TYPE_MAIN, newMainDict);
-                mMainDictionary = newMainDict;
-                if (listener != null) {
-                    listener.onUpdateMainDictionaryAvailability(hasMainDictionary());
-                }
-                mIsCurrentlyWaitingForMainDictionary = false;
-            }
-        }.start();
-    }
-
-    // The main dictionary could have been loaded asynchronously.  Don't cache the return value
-    // of this method.
-    public boolean hasMainDictionary() {
-        return null != mMainDictionary && mMainDictionary.isInitialized();
-    }
-
-    @UsedForTesting
-    public boolean isCurrentlyWaitingForMainDictionary() {
-        return mIsCurrentlyWaitingForMainDictionary;
-    }
-
-    public Dictionary getMainDictionary() {
-        return mMainDictionary;
-    }
-
-    public ContactsBinaryDictionary getContactsDictionary() {
-        return mContactsDict;
-    }
-
-    public ConcurrentHashMap<String, Dictionary> getUnigramDictionaries() {
-        return mDictionaries;
-    }
-
-    /**
-     * Sets an optional user dictionary resource to be loaded. The user dictionary is consulted
-     * before the main dictionary, if set. This refers to the system-managed user dictionary.
-     */
-    public void setUserDictionary(final UserBinaryDictionary userDictionary) {
-        addOrReplaceDictionaryInternal(Dictionary.TYPE_USER, userDictionary);
-    }
-
-    /**
-     * Sets an optional contacts dictionary resource to be loaded. It is also possible to remove
-     * the contacts dictionary by passing null to this method. In this case no contacts dictionary
-     * won't be used.
-     */
-    public void setContactsDictionary(final ContactsBinaryDictionary contactsDictionary) {
-        mContactsDict = contactsDictionary;
-        addOrReplaceDictionaryInternal(Dictionary.TYPE_CONTACTS, contactsDictionary);
-    }
-
-    public void setUserHistoryDictionary(final UserHistoryDictionary userHistoryDictionary) {
-        addOrReplaceDictionaryInternal(Dictionary.TYPE_USER_HISTORY, userHistoryDictionary);
-    }
-
-    public void setPersonalizationPredictionDictionary(
-            final PersonalizationPredictionDictionary personalizationPredictionDictionary) {
-        addOrReplaceDictionaryInternal(Dictionary.TYPE_PERSONALIZATION_PREDICTION_IN_JAVA,
-                personalizationPredictionDictionary);
-    }
-
-    public void setPersonalizationDictionary(
-            final PersonalizationDictionary personalizationDictionary) {
-        addOrReplaceDictionaryInternal(Dictionary.TYPE_PERSONALIZATION,
-                personalizationDictionary);
+    // Creates instance with new dictionary facilitator.
+    public Suggest(final Suggest oldSuggst,
+            final DictionaryFacilitatorForSuggest dictionaryFacilitator) {
+        mLocale = oldSuggst.mLocale;
+        mAutoCorrectionThreshold = oldSuggst.mAutoCorrectionThreshold;
+        mDictionaryFacilitator = dictionaryFacilitator;
     }
 
     public void setAutoCorrectionThreshold(float threshold) {
@@ -257,14 +126,9 @@
         } else {
             wordComposerForLookup = wordComposer;
         }
-
-        for (final String key : mDictionaries.keySet()) {
-            final Dictionary dictionary = mDictionaries.get(key);
-            suggestionsSet.addAll(dictionary.getSuggestions(wordComposerForLookup,
-                    prevWordForBigram, proximityInfo, blockOffensiveWords,
-                    additionalFeaturesOptions));
-        }
-
+        mDictionaryFacilitator.getSuggestions(wordComposerForLookup, prevWordForBigram,
+                proximityInfo, blockOffensiveWords, additionalFeaturesOptions, SESSION_TYPING,
+                suggestionsSet);
         final String whitelistedWord;
         if (suggestionsSet.isEmpty()) {
             whitelistedWord = null;
@@ -278,7 +142,7 @@
         // or if it's a 2+ characters non-word (i.e. it's not in the dictionary).
         final boolean allowsToBeAutoCorrected = (null != whitelistedWord
                 && !whitelistedWord.equals(consideredWord))
-                || (consideredWord.length() > 1 && !AutoCorrectionUtils.isValidWord(this,
+                || (consideredWord.length() > 1 && !mDictionaryFacilitator.isValidWord(
                         consideredWord, wordComposer.isFirstCharCapitalized()));
 
         final boolean hasAutoCorrection;
@@ -289,7 +153,8 @@
         // the word *would* have been auto-corrected.
         if (!isCorrectionEnabled || !allowsToBeAutoCorrected || !wordComposer.isComposingWord()
                 || suggestionsSet.isEmpty() || wordComposer.hasDigits()
-                || wordComposer.isMostlyCaps() || wordComposer.isResumed() || !hasMainDictionary()
+                || wordComposer.isMostlyCaps() || wordComposer.isResumed()
+                || !mDictionaryFacilitator.hasMainDictionary()
                 || SuggestedWordInfo.KIND_SHORTCUT == suggestionsSet.first().mKind) {
             // If we don't have a main dictionary, we never want to auto-correct. The reason for
             // this is, the user may have a contact whose name happens to match a valid word in
@@ -362,15 +227,8 @@
             final OnGetSuggestedWordsCallback callback) {
         final BoundedTreeSet suggestionsSet = new BoundedTreeSet(sSuggestedWordInfoComparator,
                 MAX_SUGGESTIONS);
-
-        // At second character typed, search the unigrams (scores being affected by bigrams)
-        for (final String key : mDictionaries.keySet()) {
-            final Dictionary dictionary = mDictionaries.get(key);
-            suggestionsSet.addAll(dictionary.getSuggestionsWithSessionId(wordComposer,
-                    prevWordForBigram, proximityInfo, blockOffensiveWords,
-                    additionalFeaturesOptions, sessionId));
-        }
-
+        mDictionaryFacilitator.getSuggestions(wordComposer, prevWordForBigram, proximityInfo,
+                blockOffensiveWords, additionalFeaturesOptions, sessionId, suggestionsSet);
         for (SuggestedWordInfo wordInfo : suggestionsSet) {
             LatinImeLogger.onAddSuggestedWord(wordInfo.mWord, wordInfo.mSourceDict.mDictType);
         }
@@ -432,7 +290,8 @@
             final String scoreInfoString;
             if (normalizedScore > 0) {
                 scoreInfoString = String.format(
-                        Locale.ROOT, "%d (%4.2f)", cur.mScore, normalizedScore);
+                        Locale.ROOT, "%d (%4.2f), %s", cur.mScore, normalizedScore,
+                        cur.mSourceDict.mDictType);
             } else {
                 scoreInfoString = Integer.toString(cur.mScore);
             }
@@ -483,11 +342,6 @@
     }
 
     public void close() {
-        final HashSet<Dictionary> dictionaries = CollectionUtils.newHashSet();
-        dictionaries.addAll(mDictionaries.values());
-        for (final Dictionary dictionary : dictionaries) {
-            dictionary.close();
-        }
-        mMainDictionary = null;
+        mDictionaryFacilitator.close();
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/SuggestedWords.java b/java/src/com/android/inputmethod/latin/SuggestedWords.java
index 97c89dd4..f9de89c 100644
--- a/java/src/com/android/inputmethod/latin/SuggestedWords.java
+++ b/java/src/com/android/inputmethod/latin/SuggestedWords.java
@@ -104,10 +104,6 @@
         return debugString;
     }
 
-    public boolean willAutoCorrect() {
-        return mWillAutoCorrect;
-    }
-
     @Override
     public String toString() {
         // Pretty-print method to help debug
@@ -150,7 +146,7 @@
         for (int index = 1; index < previousSize; index++) {
             final SuggestedWordInfo prevWordInfo = previousSuggestions.getInfo(index);
             final String prevWord = prevWordInfo.mWord;
-            // Filter out duplicate suggestion.
+            // Filter out duplicate suggestions.
             if (!alreadySeen.contains(prevWord)) {
                 suggestionsList.add(prevWordInfo);
                 alreadySeen.add(prevWord);
diff --git a/java/src/com/android/inputmethod/latin/SynchronouslyLoadedContactsBinaryDictionary.java b/java/src/com/android/inputmethod/latin/SynchronouslyLoadedContactsBinaryDictionary.java
index 3213c92..9c095e4 100644
--- a/java/src/com/android/inputmethod/latin/SynchronouslyLoadedContactsBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/SynchronouslyLoadedContactsBinaryDictionary.java
@@ -25,34 +25,26 @@
 import java.util.Locale;
 
 public final class SynchronouslyLoadedContactsBinaryDictionary extends ContactsBinaryDictionary {
-    private boolean mClosed;
+    private final Object mLock = new Object();
 
     public SynchronouslyLoadedContactsBinaryDictionary(final Context context, final Locale locale) {
         super(context, locale);
     }
 
     @Override
-    public synchronized ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer codes,
+    public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer codes,
             final String prevWordForBigrams, final ProximityInfo proximityInfo,
             final boolean blockOffensiveWords, final int[] additionalFeaturesOptions) {
-        reloadDictionaryIfRequired();
-        return super.getSuggestions(codes, prevWordForBigrams, proximityInfo, blockOffensiveWords,
-                additionalFeaturesOptions);
+        synchronized (mLock) {
+            return super.getSuggestions(codes, prevWordForBigrams, proximityInfo,
+                    blockOffensiveWords, additionalFeaturesOptions);
+        }
     }
 
     @Override
-    public synchronized boolean isValidWord(final String word) {
-        reloadDictionaryIfRequired();
-        return isValidWordInner(word);
-    }
-
-    // Protect against multiple closing
-    @Override
-    public synchronized void close() {
-        // Actually with the current implementation of ContactsDictionary it's safe to close
-        // several times, so the following protection is really only for foolproofing
-        if (mClosed) return;
-        mClosed = true;
-        super.close();
+    public boolean isValidWord(final String word) {
+        synchronized (mLock) {
+            return super.isValidWord(word);
+        }
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java b/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java
index 6405b5e..9ccd9e4 100644
--- a/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/SynchronouslyLoadedUserBinaryDictionary.java
@@ -22,30 +22,34 @@
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 
 import java.util.ArrayList;
+import java.util.Locale;
 
 public final class SynchronouslyLoadedUserBinaryDictionary extends UserBinaryDictionary {
+    private final Object mLock = new Object();
 
-    public SynchronouslyLoadedUserBinaryDictionary(final Context context, final String locale) {
+    public SynchronouslyLoadedUserBinaryDictionary(final Context context, final Locale locale) {
         this(context, locale, false);
     }
 
-    public SynchronouslyLoadedUserBinaryDictionary(final Context context, final String locale,
+    public SynchronouslyLoadedUserBinaryDictionary(final Context context, final Locale locale,
             final boolean alsoUseMoreRestrictiveLocales) {
         super(context, locale, alsoUseMoreRestrictiveLocales);
     }
 
     @Override
-    public synchronized ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer codes,
+    public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer codes,
             final String prevWordForBigrams, final ProximityInfo proximityInfo,
             final boolean blockOffensiveWords, final int[] additionalFeaturesOptions) {
-        reloadDictionaryIfRequired();
-        return super.getSuggestions(codes, prevWordForBigrams, proximityInfo, blockOffensiveWords,
-                additionalFeaturesOptions);
+        synchronized (mLock) {
+            return super.getSuggestions(codes, prevWordForBigrams, proximityInfo,
+                    blockOffensiveWords, additionalFeaturesOptions);
+        }
     }
 
     @Override
-    public synchronized boolean isValidWord(final String word) {
-        reloadDictionaryIfRequired();
-        return isValidWordInner(word);
+    public boolean isValidWord(final String word) {
+        synchronized (mLock) {
+            return super.isValidWord(word);
+        }
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java b/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java
index 15b3d8d..8011247 100644
--- a/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/UserBinaryDictionary.java
@@ -18,7 +18,6 @@
 
 import android.content.ContentProviderClient;
 import android.content.ContentResolver;
-import android.content.ContentUris;
 import android.content.Context;
 import android.database.ContentObserver;
 import android.database.Cursor;
@@ -29,10 +28,12 @@
 import android.text.TextUtils;
 import android.util.Log;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.compat.UserDictionaryCompatUtils;
 import com.android.inputmethod.latin.utils.LocaleUtils;
 import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
 
+import java.io.File;
 import java.util.Arrays;
 import java.util.Locale;
 
@@ -74,21 +75,29 @@
     private ContentObserver mObserver;
     final private String mLocale;
     final private boolean mAlsoUseMoreRestrictiveLocales;
+    final public boolean mEnabled;
 
-    public UserBinaryDictionary(final Context context, final String locale) {
+    public UserBinaryDictionary(final Context context, final Locale locale) {
         this(context, locale, false);
     }
 
-    public UserBinaryDictionary(final Context context, final String locale,
+    // Dummy constructor for tests.
+    @UsedForTesting
+    public UserBinaryDictionary(final Context context, final Locale locale, final File file) {
+        this(context, locale);
+    }
+
+    public UserBinaryDictionary(final Context context, final Locale locale,
             final boolean alsoUseMoreRestrictiveLocales) {
-        super(context, getFilenameWithLocale(NAME, locale), Dictionary.TYPE_USER,
+        super(context, getDictNameWithLocale(NAME, locale), locale, Dictionary.TYPE_USER,
                 false /* isUpdatable */);
         if (null == locale) throw new NullPointerException(); // Catch the error earlier
-        if (SubtypeLocaleUtils.NO_LANGUAGE.equals(locale)) {
+        final String localeStr = locale.toString();
+        if (SubtypeLocaleUtils.NO_LANGUAGE.equals(localeStr)) {
             // If we don't have a locale, insert into the "all locales" user dictionary.
             mLocale = USER_DICTIONARY_ALL_LANGUAGES;
         } else {
-            mLocale = locale;
+            mLocale = localeStr;
         }
         mAlsoUseMoreRestrictiveLocales = alsoUseMoreRestrictiveLocales;
         // Perform a managed query. The Activity will handle closing and re-querying the cursor
@@ -112,7 +121,7 @@
             }
         };
         cres.registerContentObserver(Words.CONTENT_URI, true, mObserver);
-
+        mEnabled = readIsEnabled();
         loadDictionary();
     }
 
@@ -190,7 +199,7 @@
         }
     }
 
-    public boolean isEnabled() {
+    private boolean readIsEnabled() {
         final ContentResolver cr = mContext.getContentResolver();
         final ContentProviderClient client = cr.acquireContentProviderClient(Words.CONTENT_URI);
         if (client != null) {
diff --git a/java/src/com/android/inputmethod/latin/WordComposer.java b/java/src/com/android/inputmethod/latin/WordComposer.java
index 039dadc..f078c73 100644
--- a/java/src/com/android/inputmethod/latin/WordComposer.java
+++ b/java/src/com/android/inputmethod/latin/WordComposer.java
@@ -48,6 +48,11 @@
     // at any given time. However this is not limited in size, while mPrimaryKeyCodes is limited
     // to MAX_WORD_LENGTH code points.
     private final StringBuilder mTypedWord;
+    // The previous word (before the composing word). Used as context for suggestions. May be null
+    // after resetting and before starting a new composing word, or when there is no context like
+    // at the start of text for example. It can also be set to null externally when the user
+    // enters a separator that does not let bigrams across, like a period or a comma.
+    private String mPreviousWordForSuggestion;
     private String mAutoCorrection;
     private boolean mIsResumed;
     private boolean mIsBatchMode;
@@ -85,6 +90,7 @@
         mIsBatchMode = false;
         mCursorPositionWithinWord = 0;
         mRejectedBatchModeSuggestion = null;
+        mPreviousWordForSuggestion = null;
         refreshSize();
     }
 
@@ -101,6 +107,7 @@
         mIsBatchMode = source.mIsBatchMode;
         mCursorPositionWithinWord = source.mCursorPositionWithinWord;
         mRejectedBatchModeSuggestion = source.mRejectedBatchModeSuggestion;
+        mPreviousWordForSuggestion = source.mPreviousWordForSuggestion;
         refreshSize();
     }
 
@@ -118,6 +125,7 @@
         mIsBatchMode = false;
         mCursorPositionWithinWord = 0;
         mRejectedBatchModeSuggestion = null;
+        mPreviousWordForSuggestion = null;
         refreshSize();
     }
 
@@ -284,8 +292,13 @@
     /**
      * Set the currently composing word to the one passed as an argument.
      * This will register NOT_A_COORDINATE for X and Ys, and use the passed keyboard for proximity.
+     * @param word the char sequence to set as the composing word.
+     * @param previousWord the previous word, to use as context for suggestions. Can be null if
+     *   the context is nil (typically, at start of text).
+     * @param keyboard the keyboard this is typed on, for coordinate info/proximity.
      */
-    public void setComposingWord(final CharSequence word, final Keyboard keyboard) {
+    public void setComposingWord(final CharSequence word, final String previousWord,
+            final Keyboard keyboard) {
         reset();
         final int length = word.length();
         for (int i = 0; i < length; i = Character.offsetByCodePoints(word, i, 1)) {
@@ -293,6 +306,7 @@
             addKeyInfo(codePoint, keyboard);
         }
         mIsResumed = true;
+        mPreviousWordForSuggestion = previousWord;
     }
 
     /**
@@ -343,6 +357,10 @@
         return mTypedWord.toString();
     }
 
+    public String getPreviousWordForSuggestion() {
+        return mPreviousWordForSuggestion;
+    }
+
     /**
      * Whether or not the user typed a capital letter as the first letter in the word
      * @return capitalization preference
@@ -388,18 +406,21 @@
     }
 
     /**
-     * Saves the caps mode at the start of composing.
+     * Saves the caps mode and the previous word at the start of composing.
      *
-     * WordComposer needs to know about this for several reasons. The first is, we need to know
-     * after the fact what the reason was, to register the correct form into the user history
-     * dictionary: if the word was automatically capitalized, we should insert it in all-lower
-     * case but if it's a manual pressing of shift, then it should be inserted as is.
+     * WordComposer needs to know about the caps mode for several reasons. The first is, we need
+     * to know after the fact what the reason was, to register the correct form into the user
+     * history dictionary: if the word was automatically capitalized, we should insert it in
+     * all-lower case but if it's a manual pressing of shift, then it should be inserted as is.
      * Also, batch input needs to know about the current caps mode to display correctly
      * capitalized suggestions.
      * @param mode the mode at the time of start
+     * @param previousWord the previous word as context for suggestions. May be null if none.
      */
-    public void setCapitalizedModeAtStartComposingTime(final int mode) {
+    public void setCapitalizedModeAndPreviousWordAtStartComposingTime(final int mode,
+            final String previousWord) {
         mCapitalizedMode = mode;
+        mPreviousWordForSuggestion = previousWord;
     }
 
     /**
@@ -451,6 +472,7 @@
         mCapsCount = 0;
         mDigitsCount = 0;
         mIsBatchMode = false;
+        mPreviousWordForSuggestion = committedWord;
         mTypedWord.setLength(0);
         mCodePointSize = 0;
         mTrailingSingleQuotesCount = 0;
@@ -464,7 +486,15 @@
         return lastComposedWord;
     }
 
-    public void resumeSuggestionOnLastComposedWord(final LastComposedWord lastComposedWord) {
+    // Call this when the recorded previous word should be discarded. This is typically called
+    // when the user inputs a separator that's not whitespace (including the case of the
+    // double-space-to-period feature).
+    public void discardPreviousWordForSuggestion() {
+        mPreviousWordForSuggestion = null;
+    }
+
+    public void resumeSuggestionOnLastComposedWord(final LastComposedWord lastComposedWord,
+            final String previousWord) {
         mPrimaryKeyCodes = lastComposedWord.mPrimaryKeyCodes;
         mInputPointers.set(lastComposedWord.mInputPointers);
         mTypedWord.setLength(0);
@@ -475,6 +505,7 @@
         mCursorPositionWithinWord = mCodePointSize;
         mRejectedBatchModeSuggestion = null;
         mIsResumed = true;
+        mPreviousWordForSuggestion = previousWord;
     }
 
     public boolean isBatchMode() {
diff --git a/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
new file mode 100644
index 0000000..c867ab3
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/inputlogic/InputLogic.java
@@ -0,0 +1,1744 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.inputlogic;
+
+import android.os.SystemClock;
+import android.text.TextUtils;
+import android.text.style.SuggestionSpan;
+import android.util.Log;
+import android.view.KeyCharacterMap;
+import android.view.KeyEvent;
+import android.view.inputmethod.CorrectionInfo;
+import android.view.inputmethod.EditorInfo;
+
+import com.android.inputmethod.compat.SuggestionSpanUtils;
+import com.android.inputmethod.event.EventInterpreter;
+import com.android.inputmethod.keyboard.Keyboard;
+import com.android.inputmethod.keyboard.KeyboardSwitcher;
+import com.android.inputmethod.keyboard.MainKeyboardView;
+import com.android.inputmethod.latin.Constants;
+import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.InputPointers;
+import com.android.inputmethod.latin.LastComposedWord;
+import com.android.inputmethod.latin.LatinIME;
+import com.android.inputmethod.latin.LatinImeLogger;
+import com.android.inputmethod.latin.RichInputConnection;
+import com.android.inputmethod.latin.SubtypeSwitcher;
+import com.android.inputmethod.latin.Suggest;
+import com.android.inputmethod.latin.Suggest.OnGetSuggestedWordsCallback;
+import com.android.inputmethod.latin.SuggestedWords;
+import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+import com.android.inputmethod.latin.WordComposer;
+import com.android.inputmethod.latin.define.ProductionFlag;
+import com.android.inputmethod.latin.settings.Settings;
+import com.android.inputmethod.latin.settings.SettingsValues;
+import com.android.inputmethod.latin.suggestions.SuggestionStripView;
+import com.android.inputmethod.latin.utils.AsyncResultHolder;
+import com.android.inputmethod.latin.utils.CollectionUtils;
+import com.android.inputmethod.latin.utils.InputTypeUtils;
+import com.android.inputmethod.latin.utils.LatinImeLoggerUtils;
+import com.android.inputmethod.latin.utils.RecapitalizeStatus;
+import com.android.inputmethod.latin.utils.StringUtils;
+import com.android.inputmethod.latin.utils.TextRange;
+import com.android.inputmethod.research.ResearchLogger;
+
+import java.util.ArrayList;
+import java.util.TreeSet;
+
+/**
+ * This class manages the input logic.
+ */
+public final class InputLogic {
+    private static final String TAG = InputLogic.class.getSimpleName();
+
+    // TODO : Remove this member when we can.
+    private final LatinIME mLatinIME;
+
+    private InputLogicHandler mInputLogicHandler;
+
+    // TODO : make all these fields private as soon as possible.
+    // Current space state of the input method. This can be any of the above constants.
+    public int mSpaceState;
+    // Never null
+    public SuggestedWords mSuggestedWords = SuggestedWords.EMPTY;
+    public Suggest mSuggest;
+    // The event interpreter should never be null.
+    public EventInterpreter mEventInterpreter;
+
+    public LastComposedWord mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
+    public final WordComposer mWordComposer;
+    public final RichInputConnection mConnection;
+    public final RecapitalizeStatus mRecapitalizeStatus = new RecapitalizeStatus();
+
+    // Keep track of the last selection range to decide if we need to show word alternatives
+    public int mLastSelectionStart = Constants.NOT_A_CURSOR_POSITION;
+    public int mLastSelectionEnd = Constants.NOT_A_CURSOR_POSITION;
+
+    private int mDeleteCount;
+    private long mLastKeyTime;
+    public final TreeSet<Long> mCurrentlyPressedHardwareKeys = CollectionUtils.newTreeSet();
+
+    // Keeps track of most recently inserted text (multi-character key) for reverting
+    private String mEnteredText;
+
+    // TODO: This boolean is persistent state and causes large side effects at unexpected times.
+    // Find a way to remove it for readability.
+    public boolean mIsAutoCorrectionIndicatorOn;
+
+    public InputLogic(final LatinIME latinIME) {
+        mLatinIME = latinIME;
+        mWordComposer = new WordComposer();
+        mEventInterpreter = new EventInterpreter(latinIME);
+        mConnection = new RichInputConnection(latinIME);
+        mInputLogicHandler = null;
+    }
+
+    /**
+     * Initializes the input logic for input in an editor.
+     *
+     * Call this when input starts or restarts in some editor (typically, in onStartInputView).
+     * If the input is starting in the same field as before, set `restarting' to true. This allows
+     * the input logic to reset only necessary stuff and save performance. Also, when restarting
+     * some things must not be done (for example, the keyboard should not be reset to the
+     * alphabetic layout), so do not send false to this just in case.
+     *
+     * @param restarting whether input is starting in the same field as before. Unused for now.
+     * @param editorInfo the editorInfo associated with the editor.
+     */
+    public void startInput(final boolean restarting, final EditorInfo editorInfo) {
+        mEnteredText = null;
+        resetComposingState(true /* alsoResetLastComposedWord */);
+        mDeleteCount = 0;
+        mSpaceState = SpaceState.NONE;
+        mRecapitalizeStatus.deactivate();
+        mCurrentlyPressedHardwareKeys.clear();
+        mSuggestedWords = SuggestedWords.EMPTY;
+        mLastSelectionStart = editorInfo.initialSelStart;
+        mLastSelectionEnd = editorInfo.initialSelEnd;
+        // In some cases (namely, after rotation of the device) editorInfo.initialSelStart is lying
+        // so we try using some heuristics to find out about these and fix them.
+        tryFixLyingCursorPosition();
+        mInputLogicHandler = new InputLogicHandler(mLatinIME, this);
+    }
+
+    /**
+     * Clean up the input logic after input is finished.
+     */
+    public void finishInput() {
+        if (mWordComposer.isComposingWord()) {
+            mConnection.finishComposingText();
+        }
+        resetComposingState(true /* alsoResetLastComposedWord */);
+        mInputLogicHandler.destroy();
+        mInputLogicHandler = null;
+    }
+
+    /**
+     * React to a string input.
+     *
+     * This is triggered by keys that input many characters at once, like the ".com" key or
+     * some additional keys for example.
+     *
+     * @param settingsValues the current values of the settings.
+     * @param rawText the text to input.
+     */
+    public void onTextInput(final SettingsValues settingsValues, final String rawText,
+            // TODO: remove this argument
+            final LatinIME.UIHandler handler) {
+        mConnection.beginBatchEdit();
+        if (mWordComposer.isComposingWord()) {
+            commitCurrentAutoCorrection(settingsValues, rawText, handler);
+        } else {
+            resetComposingState(true /* alsoResetLastComposedWord */);
+        }
+        handler.postUpdateSuggestionStrip();
+        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS
+                && ResearchLogger.RESEARCH_KEY_OUTPUT_TEXT.equals(rawText)) {
+            ResearchLogger.getInstance().onResearchKeySelected(mLatinIME);
+            return;
+        }
+        final String text = performSpecificTldProcessingOnTextInput(rawText);
+        if (SpaceState.PHANTOM == mSpaceState) {
+            promotePhantomSpace(settingsValues);
+        }
+        mConnection.commitText(text, 1);
+        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+            ResearchLogger.latinIME_onTextInput(text, false /* isBatchMode */);
+        }
+        mConnection.endBatchEdit();
+        // Space state must be updated before calling updateShiftState
+        mSpaceState = SpaceState.NONE;
+        mEnteredText = text;
+    }
+
+    /**
+     * React to a code input. It may be a code point to insert, or a symbolic value that influences
+     * the keyboard behavior.
+     *
+     * Typically, this is called whenever a key is pressed on the software keyboard. This is not
+     * the entry point for gesture input; see the onBatchInput* family of functions for this.
+     *
+     * @param code the code to handle. It may be a code point, or an internal key code.
+     * @param x the x-coordinate where the user pressed the key, or NOT_A_COORDINATE.
+     * @param y the y-coordinate where the user pressed the key, or NOT_A_COORDINATE.
+     */
+    public void onCodeInput(final int code, final int x, final int y,
+            // TODO: remove these three arguments
+            final LatinIME.UIHandler handler,
+            final KeyboardSwitcher keyboardSwitcher, final SubtypeSwitcher subtypeSwitcher) {
+        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+            ResearchLogger.latinIME_onCodeInput(code, x, y);
+        }
+        final SettingsValues settingsValues = Settings.getInstance().getCurrent();
+        final long when = SystemClock.uptimeMillis();
+        if (code != Constants.CODE_DELETE
+                || when > mLastKeyTime + Constants.LONG_PRESS_MILLISECONDS) {
+            mDeleteCount = 0;
+        }
+        mLastKeyTime = when;
+        mConnection.beginBatchEdit();
+        // The space state depends only on the last character pressed and its own previous
+        // state. Here, we revert the space state to neutral if the key is actually modifying
+        // the input contents (any non-shift key), which is what we should do for
+        // all inputs that do not result in a special state. Each character handling is then
+        // free to override the state as they see fit.
+        final int spaceState = mSpaceState;
+        if (!mWordComposer.isComposingWord()) {
+            mIsAutoCorrectionIndicatorOn = false;
+        }
+
+        // TODO: Consolidate the double-space period timer, mLastKeyTime, and the space state.
+        if (code != Constants.CODE_SPACE) {
+            handler.cancelDoubleSpacePeriodTimer();
+        }
+
+        boolean didAutoCorrect = false;
+        switch (code) {
+        case Constants.CODE_DELETE:
+            handleBackspace(settingsValues, spaceState, handler, keyboardSwitcher);
+            LatinImeLogger.logOnDelete(x, y);
+            break;
+        case Constants.CODE_SHIFT:
+            // Note: Calling back to the keyboard on Shift key is handled in
+            // {@link #onPressKey(int,int,boolean)} and {@link #onReleaseKey(int,boolean)}.
+            final Keyboard currentKeyboard = keyboardSwitcher.getKeyboard();
+            if (null != currentKeyboard && currentKeyboard.mId.isAlphabetKeyboard()) {
+                // TODO: Instead of checking for alphabetic keyboard here, separate keycodes for
+                // alphabetic shift and shift while in symbol layout.
+                performRecapitalization(settingsValues);
+                keyboardSwitcher.updateShiftState();
+            }
+            break;
+        case Constants.CODE_CAPSLOCK:
+            // Note: Changing keyboard to shift lock state is handled in
+            // {@link KeyboardSwitcher#onCodeInput(int)}.
+            break;
+        case Constants.CODE_SWITCH_ALPHA_SYMBOL:
+            // Note: Calling back to the keyboard on symbol key is handled in
+            // {@link #onPressKey(int,int,boolean)} and {@link #onReleaseKey(int,boolean)}.
+            break;
+        case Constants.CODE_SETTINGS:
+            onSettingsKeyPressed();
+            break;
+        case Constants.CODE_SHORTCUT:
+            subtypeSwitcher.switchToShortcutIME(mLatinIME);
+            break;
+        case Constants.CODE_ACTION_NEXT:
+            performEditorAction(EditorInfo.IME_ACTION_NEXT);
+            break;
+        case Constants.CODE_ACTION_PREVIOUS:
+            performEditorAction(EditorInfo.IME_ACTION_PREVIOUS);
+            break;
+        case Constants.CODE_LANGUAGE_SWITCH:
+            handleLanguageSwitchKey();
+            break;
+        case Constants.CODE_EMOJI:
+            // Note: Switching emoji keyboard is being handled in
+            // {@link KeyboardState#onCodeInput(int,int)}.
+            break;
+        case Constants.CODE_ENTER:
+            final EditorInfo editorInfo = getCurrentInputEditorInfo();
+            final int imeOptionsActionId =
+                    InputTypeUtils.getImeOptionsActionIdFromEditorInfo(editorInfo);
+            if (InputTypeUtils.IME_ACTION_CUSTOM_LABEL == imeOptionsActionId) {
+                // Either we have an actionLabel and we should performEditorAction with actionId
+                // regardless of its value.
+                performEditorAction(editorInfo.actionId);
+            } else if (EditorInfo.IME_ACTION_NONE != imeOptionsActionId) {
+                // We didn't have an actionLabel, but we had another action to execute.
+                // EditorInfo.IME_ACTION_NONE explicitly means no action. In contrast,
+                // EditorInfo.IME_ACTION_UNSPECIFIED is the default value for an action, so it
+                // means there should be an action and the app didn't bother to set a specific
+                // code for it - presumably it only handles one. It does not have to be treated
+                // in any specific way: anything that is not IME_ACTION_NONE should be sent to
+                // performEditorAction.
+                performEditorAction(imeOptionsActionId);
+            } else {
+                // No action label, and the action from imeOptions is NONE: this is a regular
+                // enter key that should input a carriage return.
+                didAutoCorrect = handleNonSpecialCharacter(settingsValues, Constants.CODE_ENTER,
+                        x, y, spaceState, keyboardSwitcher, handler);
+            }
+            break;
+        case Constants.CODE_SHIFT_ENTER:
+            didAutoCorrect = handleNonSpecialCharacter(settingsValues, Constants.CODE_ENTER,
+                    x, y, spaceState, keyboardSwitcher, handler);
+            break;
+        default:
+            didAutoCorrect = handleNonSpecialCharacter(settingsValues,
+                    code, x, y, spaceState, keyboardSwitcher, handler);
+            break;
+        }
+        keyboardSwitcher.onCodeInput(code);
+        // Reset after any single keystroke, except shift, capslock, and symbol-shift
+        if (!didAutoCorrect && code != Constants.CODE_SHIFT
+                && code != Constants.CODE_CAPSLOCK
+                && code != Constants.CODE_SWITCH_ALPHA_SYMBOL)
+            mLastComposedWord.deactivate();
+        if (Constants.CODE_DELETE != code) {
+            mEnteredText = null;
+        }
+        mConnection.endBatchEdit();
+    }
+
+    public void onStartBatchInput(final SettingsValues settingsValues,
+            // TODO: remove these arguments
+            final KeyboardSwitcher keyboardSwitcher, final LatinIME.UIHandler handler) {
+        mInputLogicHandler.onStartBatchInput();
+        handler.showGesturePreviewAndSuggestionStrip(
+                SuggestedWords.EMPTY, false /* dismissGestureFloatingPreviewText */);
+        handler.cancelUpdateSuggestionStrip();
+        mConnection.beginBatchEdit();
+        if (mWordComposer.isComposingWord()) {
+            if (settingsValues.mIsInternal) {
+                if (mWordComposer.isBatchMode()) {
+                    LatinImeLoggerUtils.onAutoCorrection("", mWordComposer.getTypedWord(), " ",
+                            mWordComposer);
+                }
+            }
+            final int wordComposerSize = mWordComposer.size();
+            // Since isComposingWord() is true, the size is at least 1.
+            if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
+                // If we are in the middle of a recorrection, we need to commit the recorrection
+                // first so that we can insert the batch input at the current cursor position.
+                resetEntireInputState(settingsValues, mLastSelectionStart, mLastSelectionEnd);
+            } else if (wordComposerSize <= 1) {
+                // We auto-correct the previous (typed, not gestured) string iff it's one character
+                // long. The reason for this is, even in the middle of gesture typing, you'll still
+                // tap one-letter words and you want them auto-corrected (typically, "i" in English
+                // should become "I"). However for any longer word, we assume that the reason for
+                // tapping probably is that the word you intend to type is not in the dictionary,
+                // so we do not attempt to correct, on the assumption that if that was a dictionary
+                // word, the user would probably have gestured instead.
+                commitCurrentAutoCorrection(settingsValues, LastComposedWord.NOT_A_SEPARATOR,
+                        handler);
+            } else {
+                commitTyped(settingsValues, LastComposedWord.NOT_A_SEPARATOR);
+            }
+        }
+        final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor();
+        if (Character.isLetterOrDigit(codePointBeforeCursor)
+                || settingsValues.isUsuallyFollowedBySpace(codePointBeforeCursor)) {
+            final boolean autoShiftHasBeenOverriden = keyboardSwitcher.getKeyboardShiftMode() !=
+                    getCurrentAutoCapsState(settingsValues);
+            mSpaceState = SpaceState.PHANTOM;
+            if (!autoShiftHasBeenOverriden) {
+                // When we change the space state, we need to update the shift state of the
+                // keyboard unless it has been overridden manually. This is happening for example
+                // after typing some letters and a period, then gesturing; the keyboard is not in
+                // caps mode yet, but since a gesture is starting, it should go in caps mode,
+                // unless the user explictly said it should not.
+                keyboardSwitcher.updateShiftState();
+            }
+        }
+        mConnection.endBatchEdit();
+        mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
+                getActualCapsMode(settingsValues, keyboardSwitcher.getKeyboardShiftMode()),
+                // Prev word is 1st word before cursor
+                getNthPreviousWordForSuggestion(settingsValues, 1 /* nthPreviousWord */));
+    }
+
+    /* The sequence number member is only used in onUpdateBatchInput. It is increased each time
+     * auto-commit happens. The reason we need this is, when auto-commit happens we trim the
+     * input pointers that are held in a singleton, and to know how much to trim we rely on the
+     * results of the suggestion process that is held in mSuggestedWords.
+     * However, the suggestion process is asynchronous, and sometimes we may enter the
+     * onUpdateBatchInput method twice without having recomputed suggestions yet, or having
+     * received new suggestions generated from not-yet-trimmed input pointers. In this case, the
+     * mIndexOfTouchPointOfSecondWords member will be out of date, and we must not use it lest we
+     * remove an unrelated number of pointers (possibly even more than are left in the input
+     * pointers, leading to a crash).
+     * To avoid that, we increase the sequence number each time we auto-commit and trim the
+     * input pointers, and we do not use any suggested words that have been generated with an
+     * earlier sequence number.
+     */
+    private int mAutoCommitSequenceNumber = 1;
+    public void onUpdateBatchInput(final SettingsValues settingsValues,
+            final InputPointers batchPointers,
+            // TODO: remove these arguments
+            final KeyboardSwitcher keyboardSwitcher) {
+        if (settingsValues.mPhraseGestureEnabled) {
+            final SuggestedWordInfo candidate = mSuggestedWords.getAutoCommitCandidate();
+            // If these suggested words have been generated with out of date input pointers, then
+            // we skip auto-commit (see comments above on the mSequenceNumber member).
+            if (null != candidate
+                    && mSuggestedWords.mSequenceNumber >= mAutoCommitSequenceNumber) {
+                if (candidate.mSourceDict.shouldAutoCommit(candidate)) {
+                    final String[] commitParts = candidate.mWord.split(" ", 2);
+                    batchPointers.shift(candidate.mIndexOfTouchPointOfSecondWord);
+                    promotePhantomSpace(settingsValues);
+                    mConnection.commitText(commitParts[0], 0);
+                    mSpaceState = SpaceState.PHANTOM;
+                    keyboardSwitcher.updateShiftState();
+                    mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
+                            getActualCapsMode(settingsValues,
+                                    keyboardSwitcher.getKeyboardShiftMode()), commitParts[0]);
+                    ++mAutoCommitSequenceNumber;
+                }
+            }
+        }
+        mInputLogicHandler.onUpdateBatchInput(batchPointers, mAutoCommitSequenceNumber);
+    }
+
+    public void onEndBatchInput(final SettingsValues settingValues,
+            final InputPointers batchPointers) {
+        mInputLogicHandler.onEndBatchInput(batchPointers, mAutoCommitSequenceNumber);
+    }
+
+    // TODO: remove this argument
+    public void onCancelBatchInput(final LatinIME.UIHandler handler) {
+        mInputLogicHandler.onCancelBatchInput();
+        handler.showGesturePreviewAndSuggestionStrip(
+                SuggestedWords.EMPTY, true /* dismissGestureFloatingPreviewText */);
+    }
+
+    /**
+     * Handle inputting a code point to the editor.
+     *
+     * Non-special keys are those that generate a single code point.
+     * This includes all letters, digits, punctuation, separators, emoji. It excludes keys that
+     * manage keyboard-related stuff like shift, language switch, settings, layout switch, or
+     * any key that results in multiple code points like the ".com" key.
+     *
+     * @param settingsValues The current settings values.
+     * @param codePoint the code point associated with the key.
+     * @param x the x-coordinate of the key press, or Contants.NOT_A_COORDINATE if not applicable.
+     * @param y the y-coordinate of the key press, or Contants.NOT_A_COORDINATE if not applicable.
+     * @param spaceState the space state at start of the batch input.
+     * @return whether this caused an auto-correction to happen.
+     */
+    private boolean handleNonSpecialCharacter(final SettingsValues settingsValues,
+            final int codePoint, final int x, final int y, final int spaceState,
+            // TODO: remove these arguments
+            final KeyboardSwitcher keyboardSwitcher, final LatinIME.UIHandler handler) {
+        mSpaceState = SpaceState.NONE;
+        final boolean didAutoCorrect;
+        if (settingsValues.isWordSeparator(codePoint)
+                || Character.getType(codePoint) == Character.OTHER_SYMBOL) {
+            didAutoCorrect = handleSeparator(settingsValues, codePoint, x, y, spaceState,
+                    keyboardSwitcher, handler);
+        } else {
+            didAutoCorrect = false;
+            if (SpaceState.PHANTOM == spaceState) {
+                if (settingsValues.mIsInternal) {
+                    if (mWordComposer.isComposingWord() && mWordComposer.isBatchMode()) {
+                        LatinImeLoggerUtils.onAutoCorrection("", mWordComposer.getTypedWord(), " ",
+                                mWordComposer);
+                    }
+                }
+                if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
+                    // If we are in the middle of a recorrection, we need to commit the recorrection
+                    // first so that we can insert the character at the current cursor position.
+                    resetEntireInputState(settingsValues, mLastSelectionStart, mLastSelectionEnd);
+                } else {
+                    commitTyped(settingsValues, LastComposedWord.NOT_A_SEPARATOR);
+                }
+            }
+            final int keyX, keyY;
+            final Keyboard keyboard = keyboardSwitcher.getKeyboard();
+            if (keyboard != null && keyboard.hasProximityCharsCorrection(codePoint)) {
+                keyX = x;
+                keyY = y;
+            } else {
+                keyX = Constants.NOT_A_COORDINATE;
+                keyY = Constants.NOT_A_COORDINATE;
+            }
+            handleNonSeparator(settingsValues, codePoint, keyX, keyY, spaceState,
+                    keyboardSwitcher, handler);
+        }
+        return didAutoCorrect;
+    }
+
+    /**
+     * Handle a non-separator.
+     * @param settingsValues The current settings values.
+     * @param codePoint the code point associated with the key.
+     * @param x the x-coordinate of the key press, or Contants.NOT_A_COORDINATE if not applicable.
+     * @param y the y-coordinate of the key press, or Contants.NOT_A_COORDINATE if not applicable.
+     * @param spaceState the space state at start of the batch input.
+     */
+    private void handleNonSeparator(final SettingsValues settingsValues,
+            final int codePoint, final int x, final int y, final int spaceState,
+            // TODO: Remove these arguments
+            final KeyboardSwitcher keyboardSwitcher, final LatinIME.UIHandler handler) {
+        // TODO: refactor this method to stop flipping isComposingWord around all the time, and
+        // make it shorter (possibly cut into several pieces). Also factor handleNonSpecialCharacter
+        // which has the same name as other handle* methods but is not the same.
+        boolean isComposingWord = mWordComposer.isComposingWord();
+
+        // TODO: remove isWordConnector() and use isUsuallyFollowedBySpace() instead.
+        // See onStartBatchInput() to see how to do it.
+        if (SpaceState.PHANTOM == spaceState && !settingsValues.isWordConnector(codePoint)) {
+            if (isComposingWord) {
+                // Sanity check
+                throw new RuntimeException("Should not be composing here");
+            }
+            promotePhantomSpace(settingsValues);
+        }
+
+        if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
+            // If we are in the middle of a recorrection, we need to commit the recorrection
+            // first so that we can insert the character at the current cursor position.
+            resetEntireInputState(settingsValues, mLastSelectionStart, mLastSelectionEnd);
+            isComposingWord = false;
+        }
+        // We want to find out whether to start composing a new word with this character. If so,
+        // we need to reset the composing state and switch isComposingWord. The order of the
+        // tests is important for good performance.
+        // We only start composing if we're not already composing.
+        if (!isComposingWord
+        // We only start composing if this is a word code point. Essentially that means it's a
+        // a letter or a word connector.
+                && settingsValues.isWordCodePoint(codePoint)
+        // We never go into composing state if suggestions are not requested.
+                && settingsValues.isSuggestionsRequested() &&
+        // In languages with spaces, we only start composing a word when we are not already
+        // touching a word. In languages without spaces, the above conditions are sufficient.
+                (!mConnection.isCursorTouchingWord(settingsValues)
+                        || !settingsValues.mCurrentLanguageHasSpaces)) {
+            // Reset entirely the composing state anyway, then start composing a new word unless
+            // the character is a single quote or a dash. The idea here is, single quote and dash
+            // are not separators and they should be treated as normal characters, except in the
+            // first position where they should not start composing a word.
+            isComposingWord = (Constants.CODE_SINGLE_QUOTE != codePoint
+                    && Constants.CODE_DASH != codePoint);
+            // Here we don't need to reset the last composed word. It will be reset
+            // when we commit this one, if we ever do; if on the other hand we backspace
+            // it entirely and resume suggestions on the previous word, we'd like to still
+            // have touch coordinates for it.
+            resetComposingState(false /* alsoResetLastComposedWord */);
+        }
+        if (isComposingWord) {
+            final MainKeyboardView mainKeyboardView = keyboardSwitcher.getMainKeyboardView();
+            // TODO: We should reconsider which coordinate system should be used to represent
+            // keyboard event.
+            final int keyX = mainKeyboardView.getKeyX(x);
+            final int keyY = mainKeyboardView.getKeyY(y);
+            mWordComposer.add(codePoint, keyX, keyY);
+            // If it's the first letter, make note of auto-caps state
+            if (mWordComposer.size() == 1) {
+                // We pass 1 to getPreviousWordForSuggestion because we were not composing a word
+                // yet, so the word we want is the 1st word before the cursor.
+                mWordComposer.setCapitalizedModeAndPreviousWordAtStartComposingTime(
+                        getActualCapsMode(settingsValues, keyboardSwitcher.getKeyboardShiftMode()),
+                        getNthPreviousWordForSuggestion(settingsValues, 1 /* nthPreviousWord */));
+            }
+            mConnection.setComposingText(getTextWithUnderline(
+                    mWordComposer.getTypedWord()), 1);
+        } else {
+            final boolean swapWeakSpace = maybeStripSpace(settingsValues,
+                    codePoint, spaceState, Constants.SUGGESTION_STRIP_COORDINATE == x);
+
+            sendKeyCodePoint(settingsValues, codePoint);
+
+            if (swapWeakSpace) {
+                swapSwapperAndSpace(keyboardSwitcher);
+                mSpaceState = SpaceState.WEAK;
+            }
+            // In case the "add to dictionary" hint was still displayed.
+            mLatinIME.dismissAddToDictionaryHint();
+        }
+        handler.postUpdateSuggestionStrip();
+        if (settingsValues.mIsInternal) {
+            LatinImeLoggerUtils.onNonSeparator((char)codePoint, x, y);
+        }
+    }
+
+    /**
+     * Handle input of a separator code point.
+     * @param settingsValues The current settings values.
+     * @param codePoint the code point associated with the key.
+     * @param x the x-coordinate of the key press, or Contants.NOT_A_COORDINATE if not applicable.
+     * @param y the y-coordinate of the key press, or Contants.NOT_A_COORDINATE if not applicable.
+     * @param spaceState the space state at start of the batch input.
+     * @return whether this caused an auto-correction to happen.
+     */
+    private boolean handleSeparator(final SettingsValues settingsValues,
+            final int codePoint, final int x, final int y, final int spaceState,
+            // TODO: remove these arguments
+            final KeyboardSwitcher keyboardSwitcher, final LatinIME.UIHandler handler) {
+        boolean didAutoCorrect = false;
+        // We avoid sending spaces in languages without spaces if we were composing.
+        final boolean shouldAvoidSendingCode = Constants.CODE_SPACE == codePoint
+                && !settingsValues.mCurrentLanguageHasSpaces
+                && mWordComposer.isComposingWord();
+        if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
+            // If we are in the middle of a recorrection, we need to commit the recorrection
+            // first so that we can insert the separator at the current cursor position.
+            resetEntireInputState(settingsValues, mLastSelectionStart, mLastSelectionEnd);
+        }
+        // isComposingWord() may have changed since we stored wasComposing
+        if (mWordComposer.isComposingWord()) {
+            if (settingsValues.mCorrectionEnabled) {
+                final String separator = shouldAvoidSendingCode ? LastComposedWord.NOT_A_SEPARATOR
+                        : StringUtils.newSingleCodePointString(codePoint);
+                commitCurrentAutoCorrection(settingsValues, separator, handler);
+                didAutoCorrect = true;
+            } else {
+                commitTyped(settingsValues, StringUtils.newSingleCodePointString(codePoint));
+            }
+        }
+
+        final boolean swapWeakSpace = maybeStripSpace(settingsValues, codePoint, spaceState,
+                Constants.SUGGESTION_STRIP_COORDINATE == x);
+
+        if (SpaceState.PHANTOM == spaceState &&
+                settingsValues.isUsuallyPrecededBySpace(codePoint)) {
+            promotePhantomSpace(settingsValues);
+        }
+        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+            ResearchLogger.latinIME_handleSeparator(codePoint, mWordComposer.isComposingWord());
+        }
+
+        if (!shouldAvoidSendingCode) {
+            sendKeyCodePoint(settingsValues, codePoint);
+        }
+
+        if (Constants.CODE_SPACE == codePoint) {
+            if (settingsValues.isSuggestionsRequested()) {
+                if (maybeDoubleSpacePeriod(settingsValues, handler)) {
+                    keyboardSwitcher.updateShiftState();
+                    mSpaceState = SpaceState.DOUBLE;
+                } else if (!mLatinIME.isShowingPunctuationList()) {
+                    mSpaceState = SpaceState.WEAK;
+                }
+            }
+
+            handler.startDoubleSpacePeriodTimer();
+            handler.postUpdateSuggestionStrip();
+        } else {
+            if (swapWeakSpace) {
+                swapSwapperAndSpace(keyboardSwitcher);
+                mSpaceState = SpaceState.SWAP_PUNCTUATION;
+            } else if (SpaceState.PHANTOM == spaceState
+                    && settingsValues.isUsuallyFollowedBySpace(codePoint)) {
+                // If we are in phantom space state, and the user presses a separator, we want to
+                // stay in phantom space state so that the next keypress has a chance to add the
+                // space. For example, if I type "Good dat", pick "day" from the suggestion strip
+                // then insert a comma and go on to typing the next word, I want the space to be
+                // inserted automatically before the next word, the same way it is when I don't
+                // input the comma.
+                // The case is a little different if the separator is a space stripper. Such a
+                // separator does not normally need a space on the right (that's the difference
+                // between swappers and strippers), so we should not stay in phantom space state if
+                // the separator is a stripper. Hence the additional test above.
+                mSpaceState = SpaceState.PHANTOM;
+            }
+
+            // Set punctuation right away. onUpdateSelection will fire but tests whether it is
+            // already displayed or not, so it's okay.
+            mLatinIME.setPunctuationSuggestions();
+        }
+        if (settingsValues.mIsInternal) {
+            LatinImeLoggerUtils.onSeparator((char)codePoint, x, y);
+        }
+
+        keyboardSwitcher.updateShiftState();
+        return didAutoCorrect;
+    }
+
+    /**
+     * Handle a press on the backspace key.
+     * @param settingsValues The current settings values.
+     * @param spaceState The space state at start of this batch edit.
+     */
+    private void handleBackspace(final SettingsValues settingsValues, final int spaceState,
+            // TODO: remove these arguments
+            final LatinIME.UIHandler handler, final KeyboardSwitcher keyboardSwitcher) {
+        mSpaceState = SpaceState.NONE;
+        final int deleteCountAtStart = mDeleteCount;
+        mDeleteCount++;
+
+        // In many cases, we may have to put the keyboard in auto-shift state again. However
+        // we want to wait a few milliseconds before doing it to avoid the keyboard flashing
+        // during key repeat.
+        handler.postUpdateShiftState();
+
+        if (mWordComposer.isCursorFrontOrMiddleOfComposingWord()) {
+            // If we are in the middle of a recorrection, we need to commit the recorrection
+            // first so that we can remove the character at the current cursor position.
+            resetEntireInputState(settingsValues, mLastSelectionStart, mLastSelectionEnd);
+            // When we exit this if-clause, mWordComposer.isComposingWord() will return false.
+        }
+        if (mWordComposer.isComposingWord()) {
+            if (mWordComposer.isBatchMode()) {
+                if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                    final String word = mWordComposer.getTypedWord();
+                    ResearchLogger.latinIME_handleBackspace_batch(word, 1);
+                }
+                final String rejectedSuggestion = mWordComposer.getTypedWord();
+                mWordComposer.reset();
+                mWordComposer.setRejectedBatchModeSuggestion(rejectedSuggestion);
+            } else {
+                mWordComposer.deleteLast();
+            }
+            mConnection.setComposingText(getTextWithUnderline(mWordComposer.getTypedWord()), 1);
+            handler.postUpdateSuggestionStrip();
+            if (!mWordComposer.isComposingWord()) {
+                // If we just removed the last character, auto-caps mode may have changed so we
+                // need to re-evaluate.
+                keyboardSwitcher.updateShiftState();
+            }
+        } else {
+            if (mLastComposedWord.canRevertCommit()) {
+                if (settingsValues.mIsInternal) {
+                    LatinImeLoggerUtils.onAutoCorrectionCancellation();
+                }
+                revertCommit(settingsValues, keyboardSwitcher, handler);
+                return;
+            }
+            if (mEnteredText != null && mConnection.sameAsTextBeforeCursor(mEnteredText)) {
+                // Cancel multi-character input: remove the text we just entered.
+                // This is triggered on backspace after a key that inputs multiple characters,
+                // like the smiley key or the .com key.
+                mConnection.deleteSurroundingText(mEnteredText.length(), 0);
+                if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                    ResearchLogger.latinIME_handleBackspace_cancelTextInput(mEnteredText);
+                }
+                mEnteredText = null;
+                // If we have mEnteredText, then we know that mHasUncommittedTypedChars == false.
+                // In addition we know that spaceState is false, and that we should not be
+                // reverting any autocorrect at this point. So we can safely return.
+                return;
+            }
+            if (SpaceState.DOUBLE == spaceState) {
+                handler.cancelDoubleSpacePeriodTimer();
+                if (mConnection.revertDoubleSpacePeriod()) {
+                    // No need to reset mSpaceState, it has already be done (that's why we
+                    // receive it as a parameter)
+                    return;
+                }
+            } else if (SpaceState.SWAP_PUNCTUATION == spaceState) {
+                if (mConnection.revertSwapPunctuation()) {
+                    // Likewise
+                    return;
+                }
+            }
+
+            // No cancelling of commit/double space/swap: we have a regular backspace.
+            // We should backspace one char and restart suggestion if at the end of a word.
+            if (mLastSelectionStart != mLastSelectionEnd) {
+                // If there is a selection, remove it.
+                final int numCharsDeleted = mLastSelectionEnd - mLastSelectionStart;
+                mConnection.setSelection(mLastSelectionEnd, mLastSelectionEnd);
+                // Reset mLastSelectionEnd to mLastSelectionStart. This is what is supposed to
+                // happen, and if it's wrong, the next call to onUpdateSelection will correct it,
+                // but we want to set it right away to avoid it being used with the wrong values
+                // later (typically, in a subsequent press on backspace).
+                mLastSelectionEnd = mLastSelectionStart;
+                mConnection.deleteSurroundingText(numCharsDeleted, 0);
+                if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                    ResearchLogger.latinIME_handleBackspace(numCharsDeleted,
+                            false /* shouldUncommitLogUnit */);
+                }
+            } else {
+                // There is no selection, just delete one character.
+                if (Constants.NOT_A_CURSOR_POSITION == mLastSelectionEnd) {
+                    // This should never happen.
+                    Log.e(TAG, "Backspace when we don't know the selection position");
+                }
+                if (settingsValues.isBeforeJellyBean() ||
+                        settingsValues.mInputAttributes.isTypeNull()) {
+                    // There are two possible reasons to send a key event: either the field has
+                    // type TYPE_NULL, in which case the keyboard should send events, or we are
+                    // running in backward compatibility mode. Before Jelly bean, the keyboard
+                    // would simulate a hardware keyboard event on pressing enter or delete. This
+                    // is bad for many reasons (there are race conditions with commits) but some
+                    // applications are relying on this behavior so we continue to support it for
+                    // older apps, so we retain this behavior if the app has target SDK < JellyBean.
+                    sendDownUpKeyEvent(KeyEvent.KEYCODE_DEL);
+                    if (mDeleteCount > Constants.DELETE_ACCELERATE_AT) {
+                        sendDownUpKeyEvent(KeyEvent.KEYCODE_DEL);
+                    }
+                } else {
+                    final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor();
+                    if (codePointBeforeCursor == Constants.NOT_A_CODE) {
+                        // Nothing to delete before the cursor.
+                        return;
+                    }
+                    final int lengthToDelete =
+                            Character.isSupplementaryCodePoint(codePointBeforeCursor) ? 2 : 1;
+                    mConnection.deleteSurroundingText(lengthToDelete, 0);
+                    if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                        ResearchLogger.latinIME_handleBackspace(lengthToDelete,
+                                true /* shouldUncommitLogUnit */);
+                    }
+                    if (mDeleteCount > Constants.DELETE_ACCELERATE_AT) {
+                        final int codePointBeforeCursorToDeleteAgain =
+                                mConnection.getCodePointBeforeCursor();
+                        if (codePointBeforeCursorToDeleteAgain != Constants.NOT_A_CODE) {
+                            final int lengthToDeleteAgain = Character.isSupplementaryCodePoint(
+                                    codePointBeforeCursorToDeleteAgain) ? 2 : 1;
+                            mConnection.deleteSurroundingText(lengthToDeleteAgain, 0);
+                            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                                ResearchLogger.latinIME_handleBackspace(lengthToDeleteAgain,
+                                        true /* shouldUncommitLogUnit */);
+                            }
+                        }
+                    }
+                }
+            }
+            if (settingsValues.isSuggestionStripVisible()
+                    && settingsValues.mCurrentLanguageHasSpaces) {
+                restartSuggestionsOnWordTouchedByCursor(settingsValues,
+                        deleteCountAtStart - mDeleteCount /* offset */,
+                        true /* includeResumedWordInSuggestions */, keyboardSwitcher);
+            }
+            // We just removed at least one character. We need to update the auto-caps state.
+            keyboardSwitcher.updateShiftState();
+        }
+    }
+
+    /**
+     * Handle a press on the language switch key (the "globe key")
+     */
+    private void handleLanguageSwitchKey() {
+        mLatinIME.switchToNextSubtype();
+    }
+
+    /**
+     * Swap a space with a space-swapping punctuation sign.
+     *
+     * This method will check that there are two characters before the cursor and that the first
+     * one is a space before it does the actual swapping.
+     */
+    // TODO: Remove this argument
+    private void swapSwapperAndSpace(final KeyboardSwitcher keyboardSwitcher) {
+        final CharSequence lastTwo = mConnection.getTextBeforeCursor(2, 0);
+        // It is guaranteed lastTwo.charAt(1) is a swapper - else this method is not called.
+        if (lastTwo != null && lastTwo.length() == 2 && lastTwo.charAt(0) == Constants.CODE_SPACE) {
+            mConnection.deleteSurroundingText(2, 0);
+            final String text = lastTwo.charAt(1) + " ";
+            mConnection.commitText(text, 1);
+            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                ResearchLogger.latinIME_swapSwapperAndSpace(lastTwo, text);
+            }
+            keyboardSwitcher.updateShiftState();
+        }
+    }
+
+    /*
+     * Strip a trailing space if necessary and returns whether it's a swap weak space situation.
+     * @param settingsValues The current settings values.
+     * @param codePoint The code point that is about to be inserted.
+     * @param spaceState The space state at start of this batch edit.
+     * @param isFromSuggestionStrip Whether this code point is coming from the suggestion strip.
+     * @return whether we should swap the space instead of removing it.
+     */
+    private boolean maybeStripSpace(final SettingsValues settingsValues,
+            final int code, final int spaceState, final boolean isFromSuggestionStrip) {
+        if (Constants.CODE_ENTER == code && SpaceState.SWAP_PUNCTUATION == spaceState) {
+            mConnection.removeTrailingSpace();
+            return false;
+        }
+        if ((SpaceState.WEAK == spaceState || SpaceState.SWAP_PUNCTUATION == spaceState)
+                && isFromSuggestionStrip) {
+            if (settingsValues.isUsuallyPrecededBySpace(code)) return false;
+            if (settingsValues.isUsuallyFollowedBySpace(code)) return true;
+            mConnection.removeTrailingSpace();
+        }
+        return false;
+    }
+
+    /**
+     * Apply the double-space-to-period transformation if applicable.
+     *
+     * The double-space-to-period transformation means that we replace two spaces with a
+     * period-space sequence of characters. This typically happens when the user presses space
+     * twice in a row quickly.
+     * This method will check that the double-space-to-period is active in settings, that the
+     * two spaces have been input close enough together, and that the previous character allows
+     * for the transformation to take place. If all of these conditions are fulfilled, this
+     * method applies the transformation and returns true. Otherwise, it does nothing and
+     * returns false.
+     *
+     * @param settingsValues the current values of the settings.
+     * @return true if we applied the double-space-to-period transformation, false otherwise.
+     */
+    private boolean maybeDoubleSpacePeriod(final SettingsValues settingsValues,
+            // TODO: remove this argument
+            final LatinIME.UIHandler handler) {
+        if (!settingsValues.mUseDoubleSpacePeriod) return false;
+        if (!handler.isAcceptingDoubleSpacePeriod()) return false;
+        // We only do this when we see two spaces and an accepted code point before the cursor.
+        // The code point may be a surrogate pair but the two spaces may not, so we need 4 chars.
+        final CharSequence lastThree = mConnection.getTextBeforeCursor(4, 0);
+        if (null == lastThree) return false;
+        final int length = lastThree.length();
+        if (length < 3) return false;
+        if (lastThree.charAt(length - 1) != Constants.CODE_SPACE) return false;
+        if (lastThree.charAt(length - 2) != Constants.CODE_SPACE) return false;
+        // We know there are spaces in pos -1 and -2, and we have at least three chars.
+        // If we have only three chars, isSurrogatePairs can't return true as charAt(1) is a space,
+        // so this is fine.
+        final int firstCodePoint =
+                Character.isSurrogatePair(lastThree.charAt(0), lastThree.charAt(1)) ?
+                        Character.codePointAt(lastThree, 0) : lastThree.charAt(length - 3);
+        if (canBeFollowedByDoubleSpacePeriod(firstCodePoint)) {
+            handler.cancelDoubleSpacePeriodTimer();
+            mConnection.deleteSurroundingText(2, 0);
+            final String textToInsert = new String(
+                    new int[] { settingsValues.mSentenceSeparator, Constants.CODE_SPACE }, 0, 2);
+            mConnection.commitText(textToInsert, 1);
+            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                ResearchLogger.latinIME_maybeDoubleSpacePeriod(textToInsert,
+                        false /* isBatchMode */);
+            }
+            mWordComposer.discardPreviousWordForSuggestion();
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Returns whether this code point can be followed by the double-space-to-period transformation.
+     *
+     * See #maybeDoubleSpaceToPeriod for details.
+     * Generally, most word characters can be followed by the double-space-to-period transformation,
+     * while most punctuation can't. Some punctuation however does allow for this to take place
+     * after them, like the closing parenthesis for example.
+     *
+     * @param codePoint the code point after which we may want to apply the transformation
+     * @return whether it's fine to apply the transformation after this code point.
+     */
+    private static boolean canBeFollowedByDoubleSpacePeriod(final int codePoint) {
+        // TODO: This should probably be a blacklist rather than a whitelist.
+        // TODO: This should probably be language-dependant...
+        return Character.isLetterOrDigit(codePoint)
+                || codePoint == Constants.CODE_SINGLE_QUOTE
+                || codePoint == Constants.CODE_DOUBLE_QUOTE
+                || codePoint == Constants.CODE_CLOSING_PARENTHESIS
+                || codePoint == Constants.CODE_CLOSING_SQUARE_BRACKET
+                || codePoint == Constants.CODE_CLOSING_CURLY_BRACKET
+                || codePoint == Constants.CODE_CLOSING_ANGLE_BRACKET
+                || codePoint == Constants.CODE_PLUS
+                || codePoint == Constants.CODE_PERCENT
+                || Character.getType(codePoint) == Character.OTHER_SYMBOL;
+    }
+
+    /**
+     * Performs a recapitalization event.
+     * @param settingsValues The current settings values.
+     */
+    private void performRecapitalization(final SettingsValues settingsValues) {
+        if (mLastSelectionStart == mLastSelectionEnd) {
+            return; // No selection
+        }
+        // If we have a recapitalize in progress, use it; otherwise, create a new one.
+        if (!mRecapitalizeStatus.isActive()
+                || !mRecapitalizeStatus.isSetAt(mLastSelectionStart, mLastSelectionEnd)) {
+            final CharSequence selectedText =
+                    mConnection.getSelectedText(0 /* flags, 0 for no styles */);
+            if (TextUtils.isEmpty(selectedText)) return; // Race condition with the input connection
+            mRecapitalizeStatus.initialize(mLastSelectionStart, mLastSelectionEnd,
+                    selectedText.toString(),
+                    settingsValues.mLocale, settingsValues.mWordSeparators);
+            // We trim leading and trailing whitespace.
+            mRecapitalizeStatus.trim();
+            // Trimming the object may have changed the length of the string, and we need to
+            // reposition the selection handles accordingly. As this result in an IPC call,
+            // only do it if it's actually necessary, in other words if the recapitalize status
+            // is not set at the same place as before.
+            if (!mRecapitalizeStatus.isSetAt(mLastSelectionStart, mLastSelectionEnd)) {
+                mLastSelectionStart = mRecapitalizeStatus.getNewCursorStart();
+                mLastSelectionEnd = mRecapitalizeStatus.getNewCursorEnd();
+            }
+        }
+        mConnection.finishComposingText();
+        mRecapitalizeStatus.rotate();
+        final int numCharsDeleted = mLastSelectionEnd - mLastSelectionStart;
+        mConnection.setSelection(mLastSelectionEnd, mLastSelectionEnd);
+        mConnection.deleteSurroundingText(numCharsDeleted, 0);
+        mConnection.commitText(mRecapitalizeStatus.getRecapitalizedString(), 0);
+        mLastSelectionStart = mRecapitalizeStatus.getNewCursorStart();
+        mLastSelectionEnd = mRecapitalizeStatus.getNewCursorEnd();
+        mConnection.setSelection(mLastSelectionStart, mLastSelectionEnd);
+    }
+
+    private void performAdditionToUserHistoryDictionary(final SettingsValues settingsValues,
+            final String suggestion, final String prevWord) {
+        // If correction is not enabled, we don't add words to the user history dictionary.
+        // That's to avoid unintended additions in some sensitive fields, or fields that
+        // expect to receive non-words.
+        if (!settingsValues.mCorrectionEnabled) return;
+
+        if (TextUtils.isEmpty(suggestion)) return;
+        final Suggest suggest = mSuggest;
+        if (suggest == null) return;
+
+        suggest.mDictionaryFacilitator.addToUserHistory(mWordComposer, prevWord, suggestion);
+    }
+
+    public void performUpdateSuggestionStripSync(final SettingsValues settingsValues,
+            // TODO: Remove this argument
+            final LatinIME.UIHandler handler) {
+        handler.cancelUpdateSuggestionStrip();
+
+        // Check if we have a suggestion engine attached.
+        if (mSuggest == null || !settingsValues.isSuggestionsRequested()) {
+            if (mWordComposer.isComposingWord()) {
+                Log.w(TAG, "Called updateSuggestionsOrPredictions but suggestions were not "
+                        + "requested!");
+            }
+            return;
+        }
+
+        if (!mWordComposer.isComposingWord() && !settingsValues.mBigramPredictionEnabled) {
+            mLatinIME.setPunctuationSuggestions();
+            return;
+        }
+
+        final AsyncResultHolder<SuggestedWords> holder = new AsyncResultHolder<SuggestedWords>();
+        mInputLogicHandler.getSuggestedWords(Suggest.SESSION_TYPING,
+                SuggestedWords.NOT_A_SEQUENCE_NUMBER, new OnGetSuggestedWordsCallback() {
+                    @Override
+                    public void onGetSuggestedWords(final SuggestedWords suggestedWords) {
+                        final SuggestedWords suggestedWordsWithMaybeOlderSuggestions =
+                                mLatinIME.maybeRetrieveOlderSuggestions(
+                                        mWordComposer.getTypedWord(), suggestedWords);
+                        holder.set(suggestedWordsWithMaybeOlderSuggestions);
+                    }
+                }
+        );
+
+        // This line may cause the current thread to wait.
+        final SuggestedWords suggestedWords = holder.get(null,
+                Constants.GET_SUGGESTED_WORDS_TIMEOUT);
+        if (suggestedWords != null) {
+            mLatinIME.showSuggestionStrip(suggestedWords);
+        }
+    }
+
+    /**
+     * Check if the cursor is touching a word. If so, restart suggestions on this word, else
+     * do nothing.
+     *
+     * @param settingsValues the current values of the settings.
+     * @param offset how much the cursor is expected to have moved since the last updateSelection.
+     * @param includeResumedWordInSuggestions whether to include the word on which we resume
+     *   suggestions in the suggestion list.
+     */
+    // TODO: make this private.
+    public void restartSuggestionsOnWordTouchedByCursor(final SettingsValues settingsValues,
+            final int offset, final boolean includeResumedWordInSuggestions,
+            // TODO: Remove this argument.
+            final KeyboardSwitcher keyboardSwitcher) {
+        // HACK: We may want to special-case some apps that exhibit bad behavior in case of
+        // recorrection. This is a temporary, stopgap measure that will be removed later.
+        // TODO: remove this.
+        if (settingsValues.isBrokenByRecorrection()) return;
+        // A simple way to test for support from the TextView.
+        if (!mLatinIME.isSuggestionsStripVisible()) return;
+        // Recorrection is not supported in languages without spaces because we don't know
+        // how to segment them yet.
+        if (!settingsValues.mCurrentLanguageHasSpaces) return;
+        // If the cursor is not touching a word, or if there is a selection, return right away.
+        if (mLastSelectionStart != mLastSelectionEnd) return;
+        // If we don't know the cursor location, return.
+        if (mLastSelectionStart < 0) return;
+        final int expectedCursorPosition = mLastSelectionStart + offset; // We know Start == End
+        if (!mConnection.isCursorTouchingWord(settingsValues)) return;
+        final TextRange range = mConnection.getWordRangeAtCursor(
+                settingsValues.mWordSeparators, 0 /* additionalPrecedingWordsCount */);
+        if (null == range) return; // Happens if we don't have an input connection at all
+        if (range.length() <= 0) return; // Race condition. No text to resume on, so bail out.
+        // If for some strange reason (editor bug or so) we measure the text before the cursor as
+        // longer than what the entire text is supposed to be, the safe thing to do is bail out.
+        final int numberOfCharsInWordBeforeCursor = range.getNumberOfCharsInWordBeforeCursor();
+        if (numberOfCharsInWordBeforeCursor > expectedCursorPosition) return;
+        final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
+        final String typedWord = range.mWord.toString();
+        if (includeResumedWordInSuggestions) {
+            suggestions.add(new SuggestedWordInfo(typedWord,
+                    SuggestionStripView.MAX_SUGGESTIONS + 1,
+                    SuggestedWordInfo.KIND_TYPED, Dictionary.DICTIONARY_USER_TYPED,
+                    SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */,
+                    SuggestedWordInfo.NOT_A_CONFIDENCE /* autoCommitFirstWordConfidence */));
+        }
+        if (!isResumableWord(settingsValues, typedWord)) return;
+        int i = 0;
+        for (final SuggestionSpan span : range.getSuggestionSpansAtWord()) {
+            for (final String s : span.getSuggestions()) {
+                ++i;
+                if (!TextUtils.equals(s, typedWord)) {
+                    suggestions.add(new SuggestedWordInfo(s,
+                            SuggestionStripView.MAX_SUGGESTIONS - i,
+                            SuggestedWordInfo.KIND_RESUMED, Dictionary.DICTIONARY_RESUMED,
+                            SuggestedWordInfo.NOT_AN_INDEX /* indexOfTouchPointOfSecondWord */,
+                            SuggestedWordInfo.NOT_A_CONFIDENCE
+                                    /* autoCommitFirstWordConfidence */));
+                }
+            }
+        }
+        mWordComposer.setComposingWord(typedWord,
+                getNthPreviousWordForSuggestion(settingsValues,
+                        // We want the previous word for suggestion. If we have chars in the word
+                        // before the cursor, then we want the word before that, hence 2; otherwise,
+                        // we want the word immediately before the cursor, hence 1.
+                        0 == numberOfCharsInWordBeforeCursor ? 1 : 2),
+                keyboardSwitcher.getKeyboard());
+        mWordComposer.setCursorPositionWithinWord(
+                typedWord.codePointCount(0, numberOfCharsInWordBeforeCursor));
+        // TODO: Change these two lines to setComposingRegion(cursorPosition,
+        //         cursorPosition + range.getNumberOfCharsInWordAfterCursor());
+        mConnection.deleteSurroundingText(numberOfCharsInWordBeforeCursor,
+              typedWord.length() - numberOfCharsInWordBeforeCursor);
+        mConnection.setComposingText(typedWord, 1);
+        if (suggestions.isEmpty()) {
+            // We come here if there weren't any suggestion spans on this word. We will try to
+            // compute suggestions for it instead.
+            mInputLogicHandler.getSuggestedWords(Suggest.SESSION_TYPING,
+                    SuggestedWords.NOT_A_SEQUENCE_NUMBER, new OnGetSuggestedWordsCallback() {
+                        @Override
+                        public void onGetSuggestedWords(
+                                final SuggestedWords suggestedWordsIncludingTypedWord) {
+                            final SuggestedWords suggestedWords;
+                            if (suggestedWordsIncludingTypedWord.size() > 1
+                                    && !includeResumedWordInSuggestions) {
+                                // We were able to compute new suggestions for this word.
+                                // Remove the typed word, since we don't want to display it in this
+                                // case. The #getSuggestedWordsExcludingTypedWord() method sets
+                                // willAutoCorrect to false.
+                                suggestedWords = suggestedWordsIncludingTypedWord
+                                        .getSuggestedWordsExcludingTypedWord();
+                            } else {
+                                // No saved suggestions, and we were unable to compute any good one
+                                // either. Rather than displaying an empty suggestion strip, we'll
+                                // display the original word alone in the middle.
+                                // Since there is only one word, willAutoCorrect is false.
+                                suggestedWords = suggestedWordsIncludingTypedWord;
+                            }
+                            // We need to pass typedWord because mWordComposer.mTypedWord may
+                            // differ from typedWord.
+                            mLatinIME.unsetIsAutoCorrectionIndicatorOnAndCallShowSuggestionStrip(
+                                    suggestedWords, typedWord);
+                        }});
+        } else {
+            // We found suggestion spans in the word. We'll create the SuggestedWords out of
+            // them, and make willAutoCorrect false.
+            final SuggestedWords suggestedWords = new SuggestedWords(suggestions,
+                    true /* typedWordValid */, false /* willAutoCorrect */,
+                    false /* isPunctuationSuggestions */, false /* isObsoleteSuggestions */,
+                    false /* isPrediction */);
+            // We need to pass typedWord because mWordComposer.mTypedWord may differ from typedWord.
+            mLatinIME.unsetIsAutoCorrectionIndicatorOnAndCallShowSuggestionStrip(suggestedWords,
+                    typedWord);
+        }
+    }
+
+    /**
+     * Reverts a previous commit with auto-correction.
+     *
+     * This is triggered upon pressing backspace just after a commit with auto-correction.
+     *
+     * @param settingsValues the current settings values.
+     */
+    private void revertCommit(final SettingsValues settingsValues,
+            // TODO: remove these arguments
+            final KeyboardSwitcher keyboardSwitcher, final LatinIME.UIHandler handler) {
+        final String previousWord = mLastComposedWord.mPrevWord;
+        final String originallyTypedWord = mLastComposedWord.mTypedWord;
+        final String committedWord = mLastComposedWord.mCommittedWord;
+        final int cancelLength = committedWord.length();
+        // We want java chars, not codepoints for the following.
+        final int separatorLength = mLastComposedWord.mSeparatorString.length();
+        // TODO: should we check our saved separator against the actual contents of the text view?
+        final int deleteLength = cancelLength + separatorLength;
+        if (LatinImeLogger.sDBG) {
+            if (mWordComposer.isComposingWord()) {
+                throw new RuntimeException("revertCommit, but we are composing a word");
+            }
+            final CharSequence wordBeforeCursor =
+                    mConnection.getTextBeforeCursor(deleteLength, 0).subSequence(0, cancelLength);
+            if (!TextUtils.equals(committedWord, wordBeforeCursor)) {
+                throw new RuntimeException("revertCommit check failed: we thought we were "
+                        + "reverting \"" + committedWord
+                        + "\", but before the cursor we found \"" + wordBeforeCursor + "\"");
+            }
+        }
+        mConnection.deleteSurroundingText(deleteLength, 0);
+        if (!TextUtils.isEmpty(previousWord) && !TextUtils.isEmpty(committedWord)) {
+            if (mSuggest != null) {
+                mSuggest.mDictionaryFacilitator.cancelAddingUserHistory(
+                        previousWord, committedWord);
+            }
+        }
+        final String stringToCommit = originallyTypedWord + mLastComposedWord.mSeparatorString;
+        if (settingsValues.mCurrentLanguageHasSpaces) {
+            // For languages with spaces, we revert to the typed string, but the cursor is still
+            // after the separator so we don't resume suggestions. If the user wants to correct
+            // the word, they have to press backspace again.
+            mConnection.commitText(stringToCommit, 1);
+        } else {
+            // For languages without spaces, we revert the typed string but the cursor is flush
+            // with the typed word, so we need to resume suggestions right away.
+            mWordComposer.setComposingWord(stringToCommit, previousWord,
+                    keyboardSwitcher.getKeyboard());
+            mConnection.setComposingText(stringToCommit, 1);
+        }
+        if (settingsValues.mIsInternal) {
+            LatinImeLoggerUtils.onSeparator(mLastComposedWord.mSeparatorString,
+                    Constants.NOT_A_COORDINATE, Constants.NOT_A_COORDINATE);
+        }
+        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+            ResearchLogger.latinIME_revertCommit(committedWord, originallyTypedWord,
+                    mWordComposer.isBatchMode(), mLastComposedWord.mSeparatorString);
+        }
+        // Don't restart suggestion yet. We'll restart if the user deletes the
+        // separator.
+        mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
+        // We have a separator between the word and the cursor: we should show predictions.
+        handler.postUpdateSuggestionStrip();
+    }
+
+    /**
+     * Factor in auto-caps and manual caps and compute the current caps mode.
+     * @param settingsValues the current settings values.
+     * @param keyboardShiftMode the current shift mode of the keyboard. See
+     *   KeyboardSwitcher#getKeyboardShiftMode() for possible values.
+     * @return the actual caps mode the keyboard is in right now.
+     */
+    private int getActualCapsMode(final SettingsValues settingsValues,
+            final int keyboardShiftMode) {
+        if (keyboardShiftMode != WordComposer.CAPS_MODE_AUTO_SHIFTED) return keyboardShiftMode;
+        final int auto = getCurrentAutoCapsState(settingsValues);
+        if (0 != (auto & TextUtils.CAP_MODE_CHARACTERS)) {
+            return WordComposer.CAPS_MODE_AUTO_SHIFT_LOCKED;
+        }
+        if (0 != auto) {
+            return WordComposer.CAPS_MODE_AUTO_SHIFTED;
+        }
+        return WordComposer.CAPS_MODE_OFF;
+    }
+
+    /**
+     * Gets the current auto-caps state, factoring in the space state.
+     *
+     * This method tries its best to do this in the most efficient possible manner. It avoids
+     * getting text from the editor if possible at all.
+     * This is called from the KeyboardSwitcher (through a trampoline in LatinIME) because it
+     * needs to know auto caps state to display the right layout.
+     *
+     * @param optionalSettingsValues settings values, or null if we should just get the current ones
+     *   from the singleton.
+     * @return a caps mode from TextUtils.CAP_MODE_* or Constants.TextUtils.CAP_MODE_OFF.
+     */
+    public int getCurrentAutoCapsState(final SettingsValues optionalSettingsValues) {
+        // If we are in a batch edit, we need to use the same settings values as the outside
+        // code, that will pass it to us. Otherwise, we can just take the current values.
+        final SettingsValues settingsValues = null != optionalSettingsValues
+                ? optionalSettingsValues : Settings.getInstance().getCurrent();
+        if (!settingsValues.mAutoCap) return Constants.TextUtils.CAP_MODE_OFF;
+
+        final EditorInfo ei = getCurrentInputEditorInfo();
+        if (ei == null) return Constants.TextUtils.CAP_MODE_OFF;
+        final int inputType = ei.inputType;
+        // Warning: this depends on mSpaceState, which may not be the most current value. If
+        // mSpaceState gets updated later, whoever called this may need to be told about it.
+        return mConnection.getCursorCapsMode(inputType, settingsValues,
+                SpaceState.PHANTOM == mSpaceState);
+    }
+
+    public int getCurrentRecapitalizeState() {
+        if (!mRecapitalizeStatus.isActive()
+                || !mRecapitalizeStatus.isSetAt(mLastSelectionStart, mLastSelectionEnd)) {
+            // Not recapitalizing at the moment
+            return RecapitalizeStatus.NOT_A_RECAPITALIZE_MODE;
+        }
+        return mRecapitalizeStatus.getCurrentMode();
+    }
+
+    /**
+     * @return the editor info for the current editor
+     */
+    private EditorInfo getCurrentInputEditorInfo() {
+        return mLatinIME.getCurrentInputEditorInfo();
+    }
+
+    /**
+     * Get the nth previous word before the cursor as context for the suggestion process.
+     * @param currentSettings the current settings values.
+     * @param nthPreviousWord reverse index of the word to get (1-indexed)
+     * @return the nth previous word before the cursor.
+     */
+    // TODO: Make this private
+    public String getNthPreviousWordForSuggestion(final SettingsValues currentSettings,
+            final int nthPreviousWord) {
+        if (currentSettings.mCurrentLanguageHasSpaces) {
+            // If we are typing in a language with spaces we can just look up the previous
+            // word from textview.
+            return mConnection.getNthPreviousWord(currentSettings, nthPreviousWord);
+        } else {
+            return LastComposedWord.NOT_A_COMPOSED_WORD == mLastComposedWord ? null
+                    : mLastComposedWord.mCommittedWord;
+        }
+    }
+
+    /**
+     * Tests the passed word for resumability.
+     *
+     * We can resume suggestions on words whose first code point is a word code point (with some
+     * nuances: check the code for details).
+     *
+     * @param settings the current values of the settings.
+     * @param word the word to evaluate.
+     * @return whether it's fine to resume suggestions on this word.
+     */
+    private static boolean isResumableWord(final SettingsValues settings, final String word) {
+        final int firstCodePoint = word.codePointAt(0);
+        return settings.isWordCodePoint(firstCodePoint)
+                && Constants.CODE_SINGLE_QUOTE != firstCodePoint
+                && Constants.CODE_DASH != firstCodePoint;
+    }
+
+    /**
+     * @param actionId the action to perform
+     */
+    private void performEditorAction(final int actionId) {
+        mConnection.performEditorAction(actionId);
+    }
+
+    /**
+     * Perform the processing specific to inputting TLDs.
+     *
+     * Some keys input a TLD (specifically, the ".com" key) and this warrants some specific
+     * processing. First, if this is a TLD, we ignore PHANTOM spaces -- this is done by type
+     * of character in onCodeInput, but since this gets inputted as a whole string we need to
+     * do it here specifically. Then, if the last character before the cursor is a period, then
+     * we cut the dot at the start of ".com". This is because humans tend to type "www.google."
+     * and then press the ".com" key and instinctively don't expect to get "www.google..com".
+     *
+     * @param text the raw text supplied to onTextInput
+     * @return the text to actually send to the editor
+     */
+    private String performSpecificTldProcessingOnTextInput(final String text) {
+        if (text.length() <= 1 || text.charAt(0) != Constants.CODE_PERIOD
+                || !Character.isLetter(text.charAt(1))) {
+            // Not a tld: do nothing.
+            return text;
+        }
+        // We have a TLD (or something that looks like this): make sure we don't add
+        // a space even if currently in phantom mode.
+        mSpaceState = SpaceState.NONE;
+        final int codePointBeforeCursor = mConnection.getCodePointBeforeCursor();
+        // If no code point, #getCodePointBeforeCursor returns NOT_A_CODE_POINT.
+        if (Constants.CODE_PERIOD == codePointBeforeCursor) {
+            return text.substring(1);
+        } else {
+            return text;
+        }
+    }
+
+    /**
+     * Handle a press on the settings key.
+     */
+    private void onSettingsKeyPressed() {
+        mLatinIME.displaySettingsDialog();
+    }
+
+    /**
+     * Resets the whole input state to the starting state.
+     *
+     * This will clear the composing word, reset the last composed word, clear the suggestion
+     * strip and tell the input connection about it so that it can refresh its caches.
+     *
+     * @param settingsValues the current values of the settings.
+     * @param newSelStart the new selection start, in java characters.
+     * @param newSelEnd the new selection end, in java characters.
+     */
+    // TODO: how is this different from startInput ?!
+    // TODO: remove all references to this in LatinIME and make this private
+    public void resetEntireInputState(final SettingsValues settingsValues,
+            final int newSelStart, final int newSelEnd) {
+        final boolean shouldFinishComposition = mWordComposer.isComposingWord();
+        resetComposingState(true /* alsoResetLastComposedWord */);
+        if (settingsValues.mBigramPredictionEnabled) {
+            mLatinIME.clearSuggestionStrip();
+        } else {
+            mLatinIME.setSuggestedWords(settingsValues.mSuggestPuncList);
+        }
+        mConnection.resetCachesUponCursorMoveAndReturnSuccess(newSelStart, newSelEnd,
+                shouldFinishComposition);
+    }
+
+    /**
+     * Resets only the composing state.
+     *
+     * Compare #resetEntireInputState, which also clears the suggestion strip and resets the
+     * input connection caches. This only deals with the composing state.
+     *
+     * @param alsoResetLastComposedWord whether to also reset the last composed word.
+     */
+    // TODO: remove all references to this in LatinIME and make this private.
+    public void resetComposingState(final boolean alsoResetLastComposedWord) {
+        mWordComposer.reset();
+        if (alsoResetLastComposedWord) {
+            mLastComposedWord = LastComposedWord.NOT_A_COMPOSED_WORD;
+        }
+    }
+
+    /**
+     * Gets a chunk of text with or the auto-correction indicator underline span as appropriate.
+     *
+     * This method looks at the old state of the auto-correction indicator to put or not put
+     * the underline span as appropriate. It is important to note that this does not correspond
+     * exactly to whether this word will be auto-corrected to or not: what's important here is
+     * to keep the same indication as before.
+     * When we add a new code point to a composing word, we don't know yet if we are going to
+     * auto-correct it until the suggestions are computed. But in the mean time, we still need
+     * to display the character and to extend the previous underline. To avoid any flickering,
+     * the underline should keep the same color it used to have, even if that's not ultimately
+     * the correct color for this new word. When the suggestions are finished evaluating, we
+     * will call this method again to fix the color of the underline.
+     *
+     * @param text the text on which to maybe apply the span.
+     * @return the same text, with the auto-correction underline span if that's appropriate.
+     */
+    // TODO: remove all references to this in LatinIME and make this private. Also, shouldn't
+    // this go in some *Utils class instead?
+    public CharSequence getTextWithUnderline(final String text) {
+        return mIsAutoCorrectionIndicatorOn
+                ? SuggestionSpanUtils.getTextWithAutoCorrectionIndicatorUnderline(mLatinIME, text)
+                : text;
+    }
+
+    /**
+     * Sends a DOWN key event followed by an UP key event to the editor.
+     *
+     * If possible at all, avoid using this method. It causes all sorts of race conditions with
+     * the text view because it goes through a different, asynchronous binder. Also, batch edits
+     * are ignored for key events. Use the normal software input methods instead.
+     *
+     * @param keyCode the key code to send inside the key event.
+     */
+    private void sendDownUpKeyEvent(final int keyCode) {
+        final long eventTime = SystemClock.uptimeMillis();
+        mConnection.sendKeyEvent(new KeyEvent(eventTime, eventTime,
+                KeyEvent.ACTION_DOWN, keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
+                KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
+        mConnection.sendKeyEvent(new KeyEvent(SystemClock.uptimeMillis(), eventTime,
+                KeyEvent.ACTION_UP, keyCode, 0, 0, KeyCharacterMap.VIRTUAL_KEYBOARD, 0,
+                KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
+    }
+
+    /**
+     * Sends a code point to the editor, using the most appropriate method.
+     *
+     * Normally we send code points with commitText, but there are some cases (where backward
+     * compatibility is a concern for example) where we want to use deprecated methods.
+     *
+     * @param settingsValues the current values of the settings.
+     * @param codePoint the code point to send.
+     */
+    private void sendKeyCodePoint(final SettingsValues settingsValues, final int codePoint) {
+        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+            ResearchLogger.latinIME_sendKeyCodePoint(codePoint);
+        }
+        // TODO: Remove this special handling of digit letters.
+        // For backward compatibility. See {@link InputMethodService#sendKeyChar(char)}.
+        if (codePoint >= '0' && codePoint <= '9') {
+            sendDownUpKeyEvent(codePoint - '0' + KeyEvent.KEYCODE_0);
+            return;
+        }
+
+        // TODO: we should do this also when the editor has TYPE_NULL
+        if (Constants.CODE_ENTER == codePoint && settingsValues.isBeforeJellyBean()) {
+            // Backward compatibility mode. Before Jelly bean, the keyboard would simulate
+            // a hardware keyboard event on pressing enter or delete. This is bad for many
+            // reasons (there are race conditions with commits) but some applications are
+            // relying on this behavior so we continue to support it for older apps.
+            sendDownUpKeyEvent(KeyEvent.KEYCODE_ENTER);
+        } else {
+            mConnection.commitText(StringUtils.newSingleCodePointString(codePoint), 1);
+        }
+    }
+
+    /**
+     * Promote a phantom space to an actual space.
+     *
+     * This essentially inserts a space, and that's it. It just checks the options and the text
+     * before the cursor are appropriate before doing it.
+     *
+     * @param settingsValues the current values of the settings.
+     */
+    // TODO: Make this private.
+    public void promotePhantomSpace(final SettingsValues settingsValues) {
+        if (settingsValues.shouldInsertSpacesAutomatically()
+                && settingsValues.mCurrentLanguageHasSpaces
+                && !mConnection.textBeforeCursorLooksLikeURL()) {
+            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                ResearchLogger.latinIME_promotePhantomSpace();
+            }
+            sendKeyCodePoint(settingsValues, Constants.CODE_SPACE);
+        }
+    }
+
+    /**
+     * Do the final processing after a batch input has ended. This commits the word to the editor.
+     * @param settingsValues the current values of the settings.
+     * @param suggestedWords suggestedWords to use.
+     */
+    public void endBatchInputAsyncInternal(final SettingsValues settingsValues,
+            final SuggestedWords suggestedWords,
+            // TODO: remove this argument
+            final KeyboardSwitcher keyboardSwitcher) {
+        final String batchInputText = suggestedWords.isEmpty() ? null : suggestedWords.getWord(0);
+        if (TextUtils.isEmpty(batchInputText)) {
+            return;
+        }
+        mConnection.beginBatchEdit();
+        if (SpaceState.PHANTOM == mSpaceState) {
+            promotePhantomSpace(settingsValues);
+        }
+        if (settingsValues.mPhraseGestureEnabled) {
+            // Find the last space
+            final int indexOfLastSpace = batchInputText.lastIndexOf(Constants.CODE_SPACE) + 1;
+            if (0 != indexOfLastSpace) {
+                mConnection.commitText(batchInputText.substring(0, indexOfLastSpace), 1);
+                mLatinIME.showSuggestionStrip(
+                        suggestedWords.getSuggestedWordsForLastWordOfPhraseGesture());
+            }
+            final String lastWord = batchInputText.substring(indexOfLastSpace);
+            mWordComposer.setBatchInputWord(lastWord);
+            mConnection.setComposingText(lastWord, 1);
+        } else {
+            mWordComposer.setBatchInputWord(batchInputText);
+            mConnection.setComposingText(batchInputText, 1);
+        }
+        mConnection.endBatchEdit();
+        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+            ResearchLogger.latinIME_onEndBatchInput(batchInputText, 0, suggestedWords);
+        }
+        // Space state must be updated before calling updateShiftState
+        mSpaceState = SpaceState.PHANTOM;
+        keyboardSwitcher.updateShiftState();
+    }
+
+    /**
+     * Commit the typed string to the editor.
+     *
+     * This is typically called when we should commit the currently composing word without applying
+     * auto-correction to it. Typically, we come here upon pressing a separator when the keyboard
+     * is configured to not do auto-correction at all (because of the settings or the properties of
+     * the editor). In this case, `separatorString' is set to the separator that was pressed.
+     * We also come here in a variety of cases with external user action. For example, when the
+     * cursor is moved while there is a composition, or when the keyboard is closed, or when the
+     * user presses the Send button for an SMS, we don't auto-correct as that would be unexpected.
+     * In this case, `separatorString' is set to NOT_A_SEPARATOR.
+     *
+     * @param settingsValues the current values of the settings.
+     * @param separatorString the separator that's causing the commit, or NOT_A_SEPARATOR if none.
+     */
+    // TODO: Make this private
+    public void commitTyped(final SettingsValues settingsValues, final String separatorString) {
+        if (!mWordComposer.isComposingWord()) return;
+        final String typedWord = mWordComposer.getTypedWord();
+        if (typedWord.length() > 0) {
+            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                ResearchLogger.getInstance().onWordFinished(typedWord, mWordComposer.isBatchMode());
+            }
+            commitChosenWord(settingsValues, typedWord,
+                    LastComposedWord.COMMIT_TYPE_USER_TYPED_WORD, separatorString);
+        }
+    }
+
+    /**
+     * Commit the current auto-correction.
+     *
+     * This will commit the best guess of the keyboard regarding what the user meant by typing
+     * the currently composing word. The IME computes suggestions and assigns a confidence score
+     * to each of them; when it's confident enough in one suggestion, it replaces the typed string
+     * by this suggestion at commit time. When it's not confident enough, or when it has no
+     * suggestions, or when the settings or environment does not allow for auto-correction, then
+     * this method just commits the typed string.
+     * Note that if suggestions are currently being computed in the background, this method will
+     * block until the computation returns. This is necessary for consistency (it would be very
+     * strange if pressing space would commit a different word depending on how fast you press).
+     *
+     * @param settingsValues the current value of the settings.
+     * @param separator the separator that's causing the commit to happen.
+     */
+    private void commitCurrentAutoCorrection(final SettingsValues settingsValues,
+            final String separator,
+            // TODO: Remove this argument.
+            final LatinIME.UIHandler handler) {
+        // Complete any pending suggestions query first
+        if (handler.hasPendingUpdateSuggestions()) {
+            performUpdateSuggestionStripSync(settingsValues, handler);
+        }
+        final String typedAutoCorrection = mWordComposer.getAutoCorrectionOrNull();
+        final String typedWord = mWordComposer.getTypedWord();
+        final String autoCorrection = (typedAutoCorrection != null)
+                ? typedAutoCorrection : typedWord;
+        if (autoCorrection != null) {
+            if (TextUtils.isEmpty(typedWord)) {
+                throw new RuntimeException("We have an auto-correction but the typed word "
+                        + "is empty? Impossible! I must commit suicide.");
+            }
+            if (settingsValues.mIsInternal) {
+                LatinImeLoggerUtils.onAutoCorrection(
+                        typedWord, autoCorrection, separator, mWordComposer);
+            }
+            if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
+                final SuggestedWords suggestedWords = mSuggestedWords;
+                ResearchLogger.latinIme_commitCurrentAutoCorrection(typedWord, autoCorrection,
+                        separator, mWordComposer.isBatchMode(), suggestedWords);
+            }
+            commitChosenWord(settingsValues, autoCorrection,
+                    LastComposedWord.COMMIT_TYPE_DECIDED_WORD, separator);
+            if (!typedWord.equals(autoCorrection)) {
+                // This will make the correction flash for a short while as a visual clue
+                // to the user that auto-correction happened. It has no other effect; in particular
+                // note that this won't affect the text inside the text field AT ALL: it only makes
+                // the segment of text starting at the supplied index and running for the length
+                // of the auto-correction flash. At this moment, the "typedWord" argument is
+                // ignored by TextView.
+                mConnection.commitCorrection(
+                        new CorrectionInfo(mLastSelectionEnd - typedWord.length(),
+                        typedWord, autoCorrection));
+            }
+        }
+    }
+
+    /**
+     * Commits the chosen word to the text field and saves it for later retrieval.
+     *
+     * @param settingsValues the current values of the settings.
+     * @param chosenWord the word we want to commit.
+     * @param commitType the type of the commit, as one of LastComposedWord.COMMIT_TYPE_*
+     * @param separatorString the separator that's causing the commit, or NOT_A_SEPARATOR if none.
+     */
+    // TODO: Make this private
+    public void commitChosenWord(final SettingsValues settingsValues, final String chosenWord,
+            final int commitType, final String separatorString) {
+        final SuggestedWords suggestedWords = mSuggestedWords;
+        mConnection.commitText(SuggestionSpanUtils.getTextWithSuggestionSpan(mLatinIME, chosenWord,
+                suggestedWords), 1);
+        // TODO: we pass 2 here, but would it be better to move this above and pass 1 instead?
+        final String prevWord = mConnection.getNthPreviousWord(settingsValues, 2);
+        // Add the word to the user history dictionary
+        performAdditionToUserHistoryDictionary(settingsValues, chosenWord, prevWord);
+        // TODO: figure out here if this is an auto-correct or if the best word is actually
+        // what user typed. Note: currently this is done much later in
+        // LastComposedWord#didCommitTypedWord by string equality of the remembered
+        // strings.
+        mLastComposedWord = mWordComposer.commitWord(commitType,
+                chosenWord, separatorString, prevWord);
+        final boolean shouldDiscardPreviousWordForSuggestion;
+        if (0 == StringUtils.codePointCount(separatorString)) {
+            // Separator is 0-length, we can keep the previous word for suggestion. Either this
+            // was a manual pick or the language has no spaces in which case we want to keep the
+            // previous word, or it was the keyboard closing or the cursor moving in which case it
+            // will be reset anyway.
+            shouldDiscardPreviousWordForSuggestion = false;
+        } else {
+            // Otherwise, we discard if the separator contains any non-whitespace.
+            shouldDiscardPreviousWordForSuggestion =
+                    !StringUtils.containsOnlyWhitespace(separatorString);
+        }
+        if (shouldDiscardPreviousWordForSuggestion) {
+            mWordComposer.discardPreviousWordForSuggestion();
+        }
+    }
+
+    /**
+     * Try to get the text from the editor to expose lies the framework may have been
+     * telling us. Concretely, when the device rotates, the frameworks tells us about where the
+     * cursor used to be initially in the editor at the time it first received the focus; this
+     * may be completely different from the place it is upon rotation. Since we don't have any
+     * means to get the real value, try at least to ask the text view for some characters and
+     * detect the most damaging cases: when the cursor position is declared to be much smaller
+     * than it really is.
+     */
+    private void tryFixLyingCursorPosition() {
+        final CharSequence textBeforeCursor = mConnection.getTextBeforeCursor(
+                Constants.EDITOR_CONTENTS_CACHE_SIZE, 0);
+        if (null == textBeforeCursor) {
+            mLastSelectionStart = mLastSelectionEnd = Constants.NOT_A_CURSOR_POSITION;
+        } else {
+            final int textLength = textBeforeCursor.length();
+            if (textLength > mLastSelectionStart
+                    || (textLength < Constants.EDITOR_CONTENTS_CACHE_SIZE
+                            && mLastSelectionStart < Constants.EDITOR_CONTENTS_CACHE_SIZE)) {
+                // It should not be possible to have only one of those variables be
+                // NOT_A_CURSOR_POSITION, so if they are equal, either the selection is zero-sized
+                // (simple cursor, no selection) or there is no cursor/we don't know its pos
+                final boolean wasEqual = mLastSelectionStart == mLastSelectionEnd;
+                mLastSelectionStart = textLength;
+                // We can't figure out the value of mLastSelectionEnd :(
+                // But at least if it's smaller than mLastSelectionStart something is wrong,
+                // and if they used to be equal we also don't want to make it look like there is a
+                // selection.
+                if (wasEqual || mLastSelectionStart > mLastSelectionEnd) {
+                    mLastSelectionEnd = mLastSelectionStart;
+                }
+            }
+        }
+    }
+
+    /**
+     * Retry resetting caches in the rich input connection.
+     *
+     * When the editor can't be accessed we can't reset the caches, so we schedule a retry.
+     * This method handles the retry, and re-schedules a new retry if we still can't access.
+     * We only retry up to 5 times before giving up.
+     *
+     * @param settingsValues the current values of the settings.
+     * @param tryResumeSuggestions Whether we should resume suggestions or not.
+     * @param remainingTries How many times we may try again before giving up.
+     */
+    // TODO: make this private
+    public void retryResetCaches(final SettingsValues settingsValues,
+            final boolean tryResumeSuggestions, final int remainingTries,
+            // TODO: remove these arguments
+            final KeyboardSwitcher keyboardSwitcher, final LatinIME.UIHandler handler) {
+        if (!mConnection.resetCachesUponCursorMoveAndReturnSuccess(
+                mLastSelectionStart, mLastSelectionEnd, false)) {
+            if (0 < remainingTries) {
+                handler.postResetCaches(tryResumeSuggestions, remainingTries - 1);
+                return;
+            }
+            // If remainingTries is 0, we should stop waiting for new tries, but it's still
+            // better to load the keyboard (less things will be broken).
+        }
+        tryFixLyingCursorPosition();
+        keyboardSwitcher.loadKeyboard(getCurrentInputEditorInfo(), settingsValues);
+        if (tryResumeSuggestions) {
+            handler.postResumeSuggestions();
+        }
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/inputlogic/InputLogicHandler.java b/java/src/com/android/inputmethod/latin/inputlogic/InputLogicHandler.java
new file mode 100644
index 0000000..3258dcd
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/inputlogic/InputLogicHandler.java
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.inputlogic;
+
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.Message;
+
+import com.android.inputmethod.latin.InputPointers;
+import com.android.inputmethod.latin.LatinIME;
+import com.android.inputmethod.latin.Suggest;
+import com.android.inputmethod.latin.SuggestedWords;
+import com.android.inputmethod.latin.Suggest.OnGetSuggestedWordsCallback;
+
+/**
+ * A helper to manage deferred tasks for the input logic.
+ */
+// TODO: Make this package private
+public class InputLogicHandler implements Handler.Callback {
+    final Handler mNonUIThreadHandler;
+    // TODO: remove this reference.
+    final LatinIME mLatinIME;
+    final InputLogic mInputLogic;
+    private final Object mLock = new Object();
+    private boolean mInBatchInput; // synchronized using {@link #mLock}.
+
+    private static final int MSG_GET_SUGGESTED_WORDS = 1;
+
+    public InputLogicHandler(final LatinIME latinIME, final InputLogic inputLogic) {
+        final HandlerThread handlerThread = new HandlerThread(
+                InputLogicHandler.class.getSimpleName());
+        handlerThread.start();
+        mNonUIThreadHandler = new Handler(handlerThread.getLooper(), this);
+        mLatinIME = latinIME;
+        mInputLogic = inputLogic;
+    }
+
+    public void destroy() {
+        mNonUIThreadHandler.getLooper().quit();
+    }
+
+    /**
+     * Handle a message.
+     * @see android.os.Handler.Callback#handleMessage(android.os.Message)
+     */
+    // Called on the Non-UI handler thread by the Handler code.
+    @Override
+    public boolean handleMessage(final Message msg) {
+        switch (msg.what) {
+            case MSG_GET_SUGGESTED_WORDS:
+                mLatinIME.getSuggestedWords(msg.arg1 /* sessionId */,
+                        msg.arg2 /* sequenceNumber */, (OnGetSuggestedWordsCallback) msg.obj);
+                break;
+        }
+        return true;
+    }
+
+    // Called on the UI thread by InputLogic.
+    public void onStartBatchInput() {
+        synchronized (mLock) {
+            mInBatchInput = true;
+        }
+    }
+
+    /**
+     * Fetch suggestions corresponding to an update of a batch input.
+     * @param batchPointers the updated pointers, including the part that was passed last time.
+     * @param sequenceNumber the sequence number associated with this batch input.
+     * @param forEnd true if this is the end of a batch input, false if it's an update.
+     */
+    // This method can be called from any thread and will see to it that the correct threads
+    // are used for parts that require it. This method will send a message to the Non-UI handler
+    // thread to pull suggestions, and get the inlined callback to get called on the Non-UI
+    // handler thread. If this is the end of a batch input, the callback will then proceed to
+    // send a message to the UI handler in LatinIME so that showing suggestions can be done on
+    // the UI thread.
+    private void updateBatchInput(final InputPointers batchPointers,
+            final int sequenceNumber, final boolean forEnd) {
+        synchronized (mLock) {
+            if (!mInBatchInput) {
+                // Batch input has ended or canceled while the message was being delivered.
+                return;
+            }
+            mInputLogic.mWordComposer.setBatchInputPointers(batchPointers);
+            getSuggestedWords(Suggest.SESSION_GESTURE, sequenceNumber,
+                    new OnGetSuggestedWordsCallback() {
+                        @Override
+                        public void onGetSuggestedWords(SuggestedWords suggestedWords) {
+                            // We're now inside the callback. This always runs on the Non-UI thread,
+                            // no matter what thread updateBatchInput was originally called on.
+                            if (suggestedWords.isEmpty()) {
+                                // Use old suggestions if we don't have any new ones.
+                                // Previous suggestions are found in InputLogic#mSuggestedWords.
+                                // Since these are the most recent ones and we just recomputed
+                                // new ones to update them, then the previous ones are there.
+                                suggestedWords = mInputLogic.mSuggestedWords;
+                            }
+                            mLatinIME.mHandler.showGesturePreviewAndSuggestionStrip(suggestedWords,
+                                    forEnd /* dismissGestureFloatingPreviewText */);
+                            if (forEnd) {
+                                mInBatchInput = false;
+                                // The following call schedules onEndBatchInputAsyncInternal
+                                // to be called on the UI thread.
+                                mLatinIME.mHandler.onEndBatchInput(suggestedWords);
+                            }
+                        }
+                    });
+        }
+    }
+
+    /**
+     * Update a batch input.
+     *
+     * This fetches suggestions and updates the suggestion strip and the floating text preview.
+     *
+     * @param batchPointers the updated batch pointers.
+     * @param sequenceNumber the sequence number associated with this batch input.
+     */
+    // Called on the UI thread by InputLogic.
+    public void onUpdateBatchInput(final InputPointers batchPointers,
+            final int sequenceNumber) {
+        updateBatchInput(batchPointers, sequenceNumber, false /* forEnd */);
+    }
+
+    /**
+     * Cancel a batch input.
+     *
+     * Note that as opposed to onEndBatchInput, we do the UI side of this immediately on the
+     * same thread, rather than get this to call a method in LatinIME. This is because
+     * canceling a batch input does not necessitate the long operation of pulling suggestions.
+     */
+    // Called on the UI thread by InputLogic.
+    public void onCancelBatchInput() {
+        synchronized (mLock) {
+            mInBatchInput = false;
+        }
+    }
+
+    /**
+     * Finish a batch input.
+     *
+     * This fetches suggestions, updates the suggestion strip and commits the first suggestion.
+     * It also dismisses the floating text preview.
+     *
+     * @param batchPointers the updated batch pointers.
+     * @param sequenceNumber the sequence number associated with this batch input.
+     */
+    // Called on the UI thread by InputLogic.
+    public void onEndBatchInput(final InputPointers batchPointers, final int sequenceNumber) {
+        updateBatchInput(batchPointers, sequenceNumber, true /* forEnd */);
+    }
+
+    public void getSuggestedWords(final int sessionId, final int sequenceNumber,
+            final OnGetSuggestedWordsCallback callback) {
+        mNonUIThreadHandler.obtainMessage(
+                MSG_GET_SUGGESTED_WORDS, sessionId, sequenceNumber, callback).sendToTarget();
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/inputlogic/SpaceState.java b/java/src/com/android/inputmethod/latin/inputlogic/SpaceState.java
new file mode 100644
index 0000000..ce80c00
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/inputlogic/SpaceState.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.inputlogic;
+
+/**
+ * Class for managing space states.
+ *
+ * At any given time, the input logic is in one of five possible space states. Depending on the
+ * current space state, some behavior will change; the prime example of this is the PHANTOM state,
+ * in which any subsequent letter input will input a space before the letter. Read on the
+ * description inside this class for each of the space states.
+ */
+public class SpaceState {
+    // None: the state where all the keyboard behavior is the most "standard" and no automatic
+    // input is added or removed. In this state, all self-inserting keys only insert themselves,
+    // and backspace removes one character.
+    public static final int NONE = 0;
+    // Double space: the state where the user pressed space twice quickly, which LatinIME
+    // resolved as period-space. In this state, pressing backspace will undo the
+    // double-space-to-period insertion: it will replace ". " with "  ".
+    public static final int DOUBLE = 1;
+    // Swap punctuation: the state where a weak space and a punctuation from the suggestion strip
+    // have just been swapped. In this state, pressing backspace will undo the swap: the
+    // characters will be swapped back back, and the space state will go to WEAK.
+    public static final int SWAP_PUNCTUATION = 2;
+    // Weak space: a space that should be swapped only by suggestion strip punctuation. Weak
+    // spaces happen when the user presses space, accepting the current suggestion (whether
+    // it's an auto-correction or not). In this state, pressing a punctuation from the suggestion
+    // strip inserts it before the space (while it inserts it after the space in the NONE state).
+    public static final int WEAK = 3;
+    // Phantom space: a not-yet-inserted space that should get inserted on the next input,
+    // character provided it's not a separator. If it's a separator, the phantom space is dropped.
+    // Phantom spaces happen when a user chooses a word from the suggestion strip. In this state,
+    // non-separators insert a space before they get inserted.
+    public static final int PHANTOM = 4;
+
+    private SpaceState() {
+        // This class is not publicly instantiable.
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
index fda97da..f8fa68f 100644
--- a/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/AbstractDictDecoder.java
@@ -32,36 +32,35 @@
  * A base class of the binary dictionary decoder.
  */
 public abstract class AbstractDictDecoder implements DictDecoder {
-    protected FileHeader readHeader(final DictBuffer dictBuffer)
+    private static final int SUCCESS = 0;
+    private static final int ERROR_CANNOT_READ = 1;
+    private static final int ERROR_WRONG_FORMAT = 2;
+
+    protected FileHeader readHeader(final DictBuffer headerBuffer)
             throws IOException, UnsupportedFormatException {
-        if (dictBuffer == null) {
+        if (headerBuffer == null) {
             openDictBuffer();
         }
 
-        final int version = HeaderReader.readVersion(dictBuffer);
+        final int version = HeaderReader.readVersion(headerBuffer);
         if (version < FormatSpec.MINIMUM_SUPPORTED_VERSION
                 || version > FormatSpec.MAXIMUM_SUPPORTED_VERSION) {
           throw new UnsupportedFormatException("Unsupported version : " + version);
         }
         // TODO: Remove this field.
-        final int optionsFlags = HeaderReader.readOptionFlags(dictBuffer);
-
-        final int headerSize = HeaderReader.readHeaderSize(dictBuffer);
-
+        final int optionsFlags = HeaderReader.readOptionFlags(headerBuffer);
+        final int headerSize = HeaderReader.readHeaderSize(headerBuffer);
         if (headerSize < 0) {
             throw new UnsupportedFormatException("header size can't be negative.");
         }
 
-        final HashMap<String, String> attributes = HeaderReader.readAttributes(dictBuffer,
+        final HashMap<String, String> attributes = HeaderReader.readAttributes(headerBuffer,
                 headerSize);
 
         final FileHeader header = new FileHeader(headerSize,
-                new FusionDictionary.DictionaryOptions(attributes,
-                        0 != (optionsFlags & FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG),
-                        0 != (optionsFlags & FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG)),
-                        new FormatOptions(version,
-                                0 != (optionsFlags & FormatSpec.SUPPORTS_DYNAMIC_UPDATE),
-                                0 != (optionsFlags & FormatSpec.CONTAINS_TIMESTAMP_FLAG)));
+                new FusionDictionary.DictionaryOptions(attributes),
+                new FormatOptions(version,
+                        0 != (optionsFlags & FormatSpec.CONTAINS_TIMESTAMP_FLAG)));
         return header;
     }
 
@@ -204,4 +203,25 @@
             return readLength;
         }
     }
+
+    /**
+     * Check whether the header contains the expected information. This is a no-error method,
+     * that will return an error code and never throw a checked exception.
+     * @return an error code, either ERROR_* or SUCCESS.
+     */
+    private int checkHeader() {
+        try {
+            readHeader();
+        } catch (IOException e) {
+            return ERROR_CANNOT_READ;
+        } catch (UnsupportedFormatException e) {
+            return ERROR_WRONG_FORMAT;
+        }
+        return SUCCESS;
+    }
+
+    @Override
+    public boolean hasValidRawBinaryDictionary() {
+        return checkHeader() == SUCCESS;
+    }
 }
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
index 216492b..9a24c47 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderUtils.java
@@ -24,12 +24,9 @@
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
 
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.nio.ByteBuffer;
-import java.nio.channels.FileChannel;
 import java.util.ArrayList;
 import java.util.Map;
 import java.util.TreeMap;
@@ -61,6 +58,7 @@
         public int readInt();
         public int position();
         public void position(int newPosition);
+        @UsedForTesting
         public void put(final byte b);
         public int limit();
         @UsedForTesting
@@ -169,6 +167,15 @@
             return size;
         }
 
+        @UsedForTesting
+        static int getCharArraySize(final int[] chars, final int start, final int end) {
+            int size = 0;
+            for (int i = start; i < end; ++i) {
+                size += getCharSize(chars[i]);
+            }
+            return size;
+        }
+
         /**
          * Writes a char array to a byte buffer.
          *
@@ -200,8 +207,7 @@
          * @param word the string to write.
          * @return the size written, in bytes.
          */
-        static int writeString(final byte[] buffer, final int origin,
-                final String word) {
+        static int writeString(final byte[] buffer, final int origin, final String word) {
             final int length = word.length();
             int index = origin;
             for (int i = 0; i < length; i = word.offsetByCodePoints(i, 1)) {
@@ -223,22 +229,63 @@
          *
          * This will also write the terminator byte.
          *
-         * @param buffer the OutputStream to write to.
+         * @param stream the OutputStream to write to.
          * @param word the string to write.
+         * @return the size written, in bytes.
          */
-        static void writeString(final OutputStream buffer, final String word) throws IOException {
+        static int writeString(final OutputStream stream, final String word) throws IOException {
             final int length = word.length();
+            int written = 0;
             for (int i = 0; i < length; i = word.offsetByCodePoints(i, 1)) {
                 final int codePoint = word.codePointAt(i);
-                if (1 == getCharSize(codePoint)) {
-                    buffer.write((byte) codePoint);
+                final int charSize = getCharSize(codePoint);
+                if (1 == charSize) {
+                    stream.write((byte) codePoint);
                 } else {
-                    buffer.write((byte) (0xFF & (codePoint >> 16)));
-                    buffer.write((byte) (0xFF & (codePoint >> 8)));
-                    buffer.write((byte) (0xFF & codePoint));
+                    stream.write((byte) (0xFF & (codePoint >> 16)));
+                    stream.write((byte) (0xFF & (codePoint >> 8)));
+                    stream.write((byte) (0xFF & codePoint));
                 }
+                written += charSize;
             }
-            buffer.write(FormatSpec.PTNODE_CHARACTERS_TERMINATOR);
+            stream.write(FormatSpec.PTNODE_CHARACTERS_TERMINATOR);
+            written += FormatSpec.PTNODE_TERMINATOR_SIZE;
+            return written;
+        }
+
+        /**
+         * Writes an array of code points with our character format to an OutputStream.
+         *
+         * This will also write the terminator byte.
+         *
+         * @param stream the OutputStream to write to.
+         * @param codePoints the array of code points
+         * @return the size written, in bytes.
+         */
+        // TODO: Merge this method with writeCharArray and rename the various write* methods to
+        // make the difference clear.
+        @UsedForTesting
+        static int writeCodePoints(final OutputStream stream, final int[] codePoints,
+                final int startIndex, final int endIndex)
+                throws IOException {
+            int written = 0;
+            for (int i = startIndex; i < endIndex; ++i) {
+                final int codePoint = codePoints[i];
+                final int charSize = getCharSize(codePoint);
+                if (1 == charSize) {
+                    stream.write((byte) codePoint);
+                } else {
+                    stream.write((byte) (0xFF & (codePoint >> 16)));
+                    stream.write((byte) (0xFF & (codePoint >> 8)));
+                    stream.write((byte) (0xFF & codePoint));
+                }
+                written += charSize;
+            }
+            if (endIndex - startIndex > 1) {
+                stream.write(FormatSpec.PTNODE_CHARACTERS_TERMINATOR);
+                written += FormatSpec.PTNODE_TERMINATOR_SIZE;
+            }
+            return written;
         }
 
         /**
@@ -286,7 +333,7 @@
 
     static int readChildrenAddress(final DictBuffer dictBuffer,
             final int optionFlags, final FormatOptions options) {
-        if (options.mSupportsDynamicUpdate) {
+        if (options.supportsDynamicUpdate()) {
             final int address = dictBuffer.readUnsignedInt24();
             if (address == 0) return FormatSpec.NO_CHILDREN_ADDRESS;
             if ((address & FormatSpec.MSB24) != 0) {
@@ -392,7 +439,7 @@
             final FormatOptions options) {
         dictDecoder.setPosition(headerSize);
         final int count = dictDecoder.readPtNodeCount();
-        int groupPos = headerSize + BinaryDictIOUtils.getPtNodeCountSize(count);
+        int groupPos = dictDecoder.getPosition();
         final StringBuilder builder = new StringBuilder();
         WeightedString result = null;
 
@@ -454,9 +501,9 @@
         do { // Scan the linked-list node.
             final int nodeArrayHeadPos = dictDecoder.getPosition();
             final int count = dictDecoder.readPtNodeCount();
-            int groupOffsetPos = nodeArrayHeadPos + BinaryDictIOUtils.getPtNodeCountSize(count);
+            int groupPos = dictDecoder.getPosition();
             for (int i = count; i > 0; --i) { // Scan the array of PtNode.
-                PtNodeInfo info = dictDecoder.readPtNode(groupOffsetPos, options);
+                PtNodeInfo info = dictDecoder.readPtNode(groupPos, options);
                 if (BinaryDictIOUtils.isMovedPtNode(info.mFlags, options)) continue;
                 ArrayList<WeightedString> shortcutTargets = info.mShortcutTargets;
                 ArrayList<WeightedString> bigrams = null;
@@ -492,15 +539,15 @@
                                     0 != (info.mFlags & FormatSpec.FLAG_IS_NOT_A_WORD),
                                     0 != (info.mFlags & FormatSpec.FLAG_IS_BLACKLISTED)));
                 }
-                groupOffsetPos = info.mEndAddress;
+                groupPos = info.mEndAddress;
             }
 
             // reach the end of the array.
-            if (options.mSupportsDynamicUpdate) {
+            if (options.supportsDynamicUpdate()) {
                 final boolean hasValidForwardLink = dictDecoder.readAndFollowForwardLink();
                 if (!hasValidForwardLink) break;
             }
-        } while (options.mSupportsDynamicUpdate && dictDecoder.hasNextPtNodeArray());
+        } while (options.supportsDynamicUpdate() && dictDecoder.hasNextPtNodeArray());
 
         final PtNodeArray nodeArray = new PtNodeArray(nodeArrayContents);
         nodeArray.mCachedAddressBeforeUpdate = nodeArrayOriginPos;
@@ -556,7 +603,7 @@
 
         Map<Integer, PtNodeArray> reverseNodeArrayMapping = new TreeMap<Integer, PtNodeArray>();
         Map<Integer, PtNode> reversePtNodeMapping = new TreeMap<Integer, PtNode>();
-        final PtNodeArray root = readNodeArray(dictDecoder, fileHeader.mHeaderSize,
+        final PtNodeArray root = readNodeArray(dictDecoder, fileHeader.mBodyOffset,
                 reverseNodeArrayMapping, reversePtNodeMapping, fileHeader.mFormatOptions);
 
         FusionDictionary newDict = new FusionDictionary(root, fileHeader.mDictionaryOptions);
@@ -592,32 +639,14 @@
     /**
      * Basic test to find out whether the file is a binary dictionary or not.
      *
-     * Concretely this only tests the magic number.
-     *
      * @param file The file to test.
      * @return true if it's a binary dictionary, false otherwise
      */
     public static boolean isBinaryDictionary(final File file) {
-        FileInputStream inStream = null;
-        try {
-            inStream = new FileInputStream(file);
-            final ByteBuffer buffer = inStream.getChannel().map(
-                    FileChannel.MapMode.READ_ONLY, 0, file.length());
-            final int version = getFormatVersion(new ByteBufferDictBuffer(buffer));
-            return (version >= FormatSpec.MINIMUM_SUPPORTED_VERSION
-                    && version <= FormatSpec.MAXIMUM_SUPPORTED_VERSION);
-        } catch (FileNotFoundException e) {
+        final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file);
+        if (dictDecoder == null) {
             return false;
-        } catch (IOException e) {
-            return false;
-        } finally {
-            if (inStream != null) {
-                try {
-                    inStream.close();
-                } catch (IOException e) {
-                    // do nothing
-                }
-            }
         }
+        return dictDecoder.hasValidRawBinaryDictionary();
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
index f761829..bb40e0d 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
@@ -16,10 +16,11 @@
 
 package com.android.inputmethod.latin.makedict;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
+import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
-import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
 
@@ -160,7 +161,7 @@
             node.mCachedSize = nodeSize;
             size += nodeSize;
         }
-        if (options.mSupportsDynamicUpdate) {
+        if (options.supportsDynamicUpdate()) {
             size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
         }
         ptNodeArray.mCachedSize = size;
@@ -245,6 +246,27 @@
         }
     }
 
+    @UsedForTesting
+    static void writeUIntToDictBuffer(final DictBuffer dictBuffer, final int value,
+            final int size) {
+        switch(size) {
+            case 4:
+                dictBuffer.put((byte) ((value >> 24) & 0xFF));
+                /* fall through */
+            case 3:
+                dictBuffer.put((byte) ((value >> 16) & 0xFF));
+                /* fall through */
+            case 2:
+                dictBuffer.put((byte) ((value >> 8) & 0xFF));
+                /* fall through */
+            case 1:
+                dictBuffer.put((byte) (value & 0xFF));
+                break;
+            default:
+                /* nop */
+        }
+    }
+
     // End utility methods
 
     // This method is responsible for finding a nice ordering of the nodes that favors run-time
@@ -377,7 +399,7 @@
                     nodeSize += FormatSpec.PTNODE_FREQUENCY_SIZE;
                 }
             }
-            if (formatOptions.mSupportsDynamicUpdate) {
+            if (formatOptions.supportsDynamicUpdate()) {
                 nodeSize += FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
             } else if (null != ptNode.mChildren) {
                 nodeSize += getByteSize(getOffsetToTargetNodeArrayDuringUpdate(ptNodeArray,
@@ -397,7 +419,7 @@
             ptNode.mCachedSize = nodeSize;
             size += nodeSize;
         }
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             size += FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
         }
         if (ptNodeArray.mCachedSize != size) {
@@ -513,7 +535,7 @@
             if (passes > MAX_PASSES) throw new RuntimeException("Too many passes - probably a bug");
         } while (changesDone);
 
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             computeParentAddresses(flatNodes);
         }
         final PtNodeArray lastPtNodeArray = flatNodes.get(flatNodes.size() - 1);
@@ -622,7 +644,7 @@
         byte flags = 0;
         if (hasMultipleChars) flags |= FormatSpec.FLAG_HAS_MULTIPLE_CHARS;
         if (isTerminal) flags |= FormatSpec.FLAG_IS_TERMINAL;
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             flags |= FormatSpec.FLAG_IS_NOT_MOVED;
         } else if (true) {
             switch (childrenAddressSize) {
@@ -690,6 +712,13 @@
                     + word + " is " + unigramFrequency);
             bigramFrequency = unigramFrequency;
         }
+        bigramFlags += getBigramFrequencyDiff(unigramFrequency, bigramFrequency)
+                & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY;
+        return bigramFlags;
+    }
+
+    public static int getBigramFrequencyDiff(final int unigramFrequency,
+            final int bigramFrequency) {
         // We compute the difference between 255 (which means probability = 1) and the
         // unigram score. We split this into a number of discrete steps.
         // Now, the steps are numbered 0~15; 0 represents an increase of 1 step while 15
@@ -723,22 +752,15 @@
         // include this bigram in the dictionary. For now, register as 0, and live with the
         // small over-estimation that we get in this case. TODO: actually remove this bigram
         // if discretizedFrequency < 0.
-        final int finalBigramFrequency = discretizedFrequency > 0 ? discretizedFrequency : 0;
-        bigramFlags += finalBigramFrequency & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY;
-        return bigramFlags;
+        return discretizedFrequency > 0 ? discretizedFrequency : 0;
     }
 
     /**
-     * Makes the 2-byte value for options flags.
+     * Makes the 2-byte value for options flags. Unused at the moment, and always 0.
      */
-    private static final int makeOptionsValue(final FusionDictionary dictionary,
-            final FormatOptions formatOptions) {
-        final DictionaryOptions options = dictionary.mOptions;
-        final boolean hasBigrams = dictionary.hasBigrams();
-        return (options.mFrenchLigatureProcessing ? FormatSpec.FRENCH_LIGATURE_PROCESSING_FLAG : 0)
-                + (options.mGermanUmlautProcessing ? FormatSpec.GERMAN_UMLAUT_PROCESSING_FLAG : 0)
-                + (hasBigrams ? FormatSpec.CONTAINS_BIGRAMS_FLAG : 0)
-                + (formatOptions.mSupportsDynamicUpdate ? FormatSpec.SUPPORTS_DYNAMIC_UPDATE : 0);
+    private static final int makeOptionsValue(final FormatOptions formatOptions) {
+        // TODO: why doesn't this handle CONTAINS_TIMESTAMP_FLAG?
+        return 0;
     }
 
     /**
@@ -826,7 +848,7 @@
             }
             dictEncoder.writePtNode(ptNode, parentPosition, formatOptions, dict);
         }
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             dictEncoder.writeForwardLinkAddress(FormatSpec.NO_FORWARD_LINK_ADDRESS);
         }
         if (dictEncoder.getPosition() != ptNodeArray.mCachedAddressAfterUpdate
@@ -927,7 +949,7 @@
         headerBuffer.write((byte) (0xFF & version));
 
         // Options flags
-        final int options = makeOptionsValue(dict, formatOptions);
+        final int options = makeOptionsValue(formatOptions);
         headerBuffer.write((byte) (0xFF & (options >> 8)));
         headerBuffer.write((byte) (0xFF & options));
         final int headerSizeOffset = headerBuffer.size();
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
index d5516ef..0dc50d1 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
@@ -23,7 +23,6 @@
 import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
-import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
 import com.android.inputmethod.latin.utils.ByteArrayDictBuffer;
 
 import java.io.File;
@@ -32,7 +31,6 @@
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.ArrayList;
-import java.util.Iterator;
 import java.util.Map;
 import java.util.Stack;
 
@@ -62,7 +60,7 @@
      * Retrieves all node arrays without recursive call.
      */
     private static void readUnigramsAndBigramsBinaryInner(final DictDecoder dictDecoder,
-            final int headerSize, final Map<Integer, String> words,
+            final int bodyOffset, final Map<Integer, String> words,
             final Map<Integer, Integer> frequencies,
             final Map<Integer, ArrayList<PendingAttribute>> bigrams,
             final FormatOptions formatOptions) {
@@ -71,7 +69,7 @@
         Stack<Position> stack = new Stack<Position>();
         int index = 0;
 
-        Position initPos = new Position(headerSize, 0);
+        Position initPos = new Position(bodyOffset, 0);
         stack.push(initPos);
 
         while (!stack.empty()) {
@@ -87,7 +85,7 @@
 
             if (p.mNumOfPtNode == Position.NOT_READ_PTNODE_COUNT) {
                 p.mNumOfPtNode = dictDecoder.readPtNodeCount();
-                p.mAddress += getPtNodeCountSize(p.mNumOfPtNode);
+                p.mAddress = dictDecoder.getPosition();
                 p.mPosition = 0;
             }
             if (p.mNumOfPtNode == 0) {
@@ -112,7 +110,7 @@
             }
 
             if (p.mPosition == p.mNumOfPtNode) {
-                if (formatOptions.mSupportsDynamicUpdate) {
+                if (formatOptions.supportsDynamicUpdate()) {
                     final boolean hasValidForwardLinkAddress =
                             dictDecoder.readAndFollowForwardLink();
                     if (hasValidForwardLinkAddress && dictDecoder.hasNextPtNodeArray()) {
@@ -154,7 +152,7 @@
             UnsupportedFormatException {
         // Read header
         final FileHeader header = dictDecoder.readHeader();
-        readUnigramsAndBigramsBinaryInner(dictDecoder, header.mHeaderSize, words,
+        readUnigramsAndBigramsBinaryInner(dictDecoder, header.mBodyOffset, words,
                 frequencies, bigrams, header.mFormatOptions);
     }
 
@@ -228,7 +226,7 @@
                 // a forward link address that we need to consult and possibly resume
                 // search on the next node array in the linked list.
                 if (foundNextPtNode) break;
-                if (!header.mFormatOptions.mSupportsDynamicUpdate) {
+                if (!header.mFormatOptions.supportsDynamicUpdate()) {
                     return FormatSpec.NOT_VALID_WORD;
                 }
 
@@ -245,8 +243,8 @@
     /**
      * @return the size written, in bytes. Always 3 bytes.
      */
-    static int writeSInt24ToBuffer(final DictBuffer dictBuffer,
-            final int value) {
+    @UsedForTesting
+    static int writeSInt24ToBuffer(final DictBuffer dictBuffer, final int value) {
         final int absValue = Math.abs(value);
         dictBuffer.put((byte)(((value < 0 ? 0x80 : 0) | (absValue >> 16)) & 0xFF));
         dictBuffer.put((byte)((absValue >> 8) & 0xFF));
@@ -257,6 +255,7 @@
     /**
      * @return the size written, in bytes. Always 3 bytes.
      */
+    @UsedForTesting
     static int writeSInt24ToStream(final OutputStream destination, final int value)
             throws IOException {
         final int absValue = Math.abs(value);
@@ -266,28 +265,7 @@
         return 3;
     }
 
-    /**
-     * @return the size written, in bytes. 1, 2, or 3 bytes.
-     */
-    private static int writeVariableAddress(final OutputStream destination, final int value)
-            throws IOException {
-        switch (BinaryDictEncoderUtils.getByteSize(value)) {
-        case 1:
-            destination.write((byte)value);
-            break;
-        case 2:
-            destination.write((byte)(0xFF & (value >> 8)));
-            destination.write((byte)(0xFF & value));
-            break;
-        case 3:
-            destination.write((byte)(0xFF & (value >> 16)));
-            destination.write((byte)(0xFF & (value >> 8)));
-            destination.write((byte)(0xFF & value));
-            break;
-        }
-        return BinaryDictEncoderUtils.getByteSize(value);
-    }
-
+    @UsedForTesting
     static void skipString(final DictBuffer dictBuffer,
             final boolean hasMultipleChars) {
         if (hasMultipleChars) {
@@ -301,176 +279,25 @@
     }
 
     /**
-     * Write a string to a stream.
+     * Writes a PtNodeCount to the stream.
      *
      * @param destination the stream to write.
-     * @param word the string to be written.
-     * @return the size written, in bytes.
-     * @throws IOException
+     * @param ptNodeCount the count.
+     * @return the size written in bytes.
      */
-    private static int writeString(final OutputStream destination, final String word)
+    @UsedForTesting
+    static int writePtNodeCount(final OutputStream destination, final int ptNodeCount)
             throws IOException {
-        int size = 0;
-        final int length = word.length();
-        for (int i = 0; i < length; i = word.offsetByCodePoints(i, 1)) {
-            final int codePoint = word.codePointAt(i);
-            if (CharEncoding.getCharSize(codePoint) == 1) {
-                destination.write((byte)codePoint);
-                size++;
-            } else {
-                destination.write((byte)(0xFF & (codePoint >> 16)));
-                destination.write((byte)(0xFF & (codePoint >> 8)));
-                destination.write((byte)(0xFF & codePoint));
-                size += 3;
-            }
+        final int countSize = BinaryDictIOUtils.getPtNodeCountSize(ptNodeCount);
+        // the count must fit on one byte or two bytes.
+        // Please see comments in FormatSpec.
+        if (countSize != 1 && countSize != 2) {
+            throw new RuntimeException("Strange size from getPtNodeCountSize : " + countSize);
         }
-        destination.write((byte)FormatSpec.PTNODE_CHARACTERS_TERMINATOR);
-        size += FormatSpec.PTNODE_TERMINATOR_SIZE;
-        return size;
-    }
-
-    /**
-     * Write a PtNode to an output stream from a PtNodeInfo.
-     * A PtNode is an in-memory representation of a node in the patricia trie.
-     * A PtNode info is a container for low-level information about how the
-     * PtNode is stored in the binary format.
-     *
-     * @param destination the stream to write.
-     * @param info the PtNode info to be written.
-     * @return the size written, in bytes.
-     */
-    private static int writePtNode(final OutputStream destination, final PtNodeInfo info)
-            throws IOException {
-        int size = FormatSpec.PTNODE_FLAGS_SIZE;
-        destination.write((byte)info.mFlags);
-        final int parentOffset = info.mParentAddress == FormatSpec.NO_PARENT_ADDRESS ?
-                FormatSpec.NO_PARENT_ADDRESS : info.mParentAddress - info.mOriginalAddress;
-        size += writeSInt24ToStream(destination, parentOffset);
-
-        for (int i = 0; i < info.mCharacters.length; ++i) {
-            if (CharEncoding.getCharSize(info.mCharacters[i]) == 1) {
-                destination.write((byte)info.mCharacters[i]);
-                size++;
-            } else {
-                size += writeSInt24ToStream(destination, info.mCharacters[i]);
-            }
-        }
-        if (info.mCharacters.length > 1) {
-            destination.write((byte)FormatSpec.PTNODE_CHARACTERS_TERMINATOR);
-            size++;
-        }
-
-        if ((info.mFlags & FormatSpec.FLAG_IS_TERMINAL) != 0) {
-            destination.write((byte)info.mFrequency);
-            size++;
-        }
-
-        if (DBG) {
-            MakedictLog.d("writePtNode origin=" + info.mOriginalAddress + ", size=" + size
-                    + ", child=" + info.mChildrenAddress + ", characters ="
-                    + new String(info.mCharacters, 0, info.mCharacters.length));
-        }
-        final int childrenOffset = info.mChildrenAddress == FormatSpec.NO_CHILDREN_ADDRESS ?
-                0 : info.mChildrenAddress - (info.mOriginalAddress + size);
-        writeSInt24ToStream(destination, childrenOffset);
-        size += FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
-
-        if (info.mShortcutTargets != null && info.mShortcutTargets.size() > 0) {
-            final int shortcutListSize =
-                    BinaryDictEncoderUtils.getShortcutListSize(info.mShortcutTargets);
-            destination.write((byte)(shortcutListSize >> 8));
-            destination.write((byte)(shortcutListSize & 0xFF));
-            size += 2;
-            final Iterator<WeightedString> shortcutIterator = info.mShortcutTargets.iterator();
-            while (shortcutIterator.hasNext()) {
-                final WeightedString target = shortcutIterator.next();
-                destination.write((byte)BinaryDictEncoderUtils.makeShortcutFlags(
-                        shortcutIterator.hasNext(), target.mFrequency));
-                size++;
-                size += writeString(destination, target.mWord);
-            }
-        }
-
-        if (info.mBigrams != null) {
-            // TODO: Consolidate this code with the code that computes the size of the bigram list
-            //        in BinaryDictEncoderUtils#computeActualNodeArraySize
-            for (int i = 0; i < info.mBigrams.size(); ++i) {
-
-                final int bigramFrequency = info.mBigrams.get(i).mFrequency;
-                int bigramFlags = (i < info.mBigrams.size() - 1)
-                        ? FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_HAS_NEXT : 0;
-                size++;
-                final int bigramOffset = info.mBigrams.get(i).mAddress - (info.mOriginalAddress
-                        + size);
-                bigramFlags |= (bigramOffset < 0) ? FormatSpec.FLAG_BIGRAM_ATTR_OFFSET_NEGATIVE : 0;
-                switch (BinaryDictEncoderUtils.getByteSize(bigramOffset)) {
-                case 1:
-                    bigramFlags |= FormatSpec.FLAG_BIGRAM_ATTR_ADDRESS_TYPE_ONEBYTE;
-                    break;
-                case 2:
-                    bigramFlags |= FormatSpec.FLAG_BIGRAM_ATTR_ADDRESS_TYPE_TWOBYTES;
-                    break;
-                case 3:
-                    bigramFlags |= FormatSpec.FLAG_BIGRAM_ATTR_ADDRESS_TYPE_THREEBYTES;
-                    break;
-                }
-                bigramFlags |= bigramFrequency & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY;
-                destination.write((byte)bigramFlags);
-                size += writeVariableAddress(destination, Math.abs(bigramOffset));
-            }
-        }
-        return size;
-    }
-
-    /**
-     * Compute the size of the PtNode.
-     */
-    static int computePtNodeSize(final PtNodeInfo info, final FormatOptions formatOptions) {
-        int size = FormatSpec.PTNODE_FLAGS_SIZE + FormatSpec.PARENT_ADDRESS_SIZE
-                + BinaryDictEncoderUtils.getPtNodeCharactersSize(info.mCharacters)
-                + getChildrenAddressSize(info.mFlags, formatOptions);
-        if ((info.mFlags & FormatSpec.FLAG_IS_TERMINAL) != 0) {
-            size += FormatSpec.PTNODE_FREQUENCY_SIZE;
-        }
-        if (info.mShortcutTargets != null && !info.mShortcutTargets.isEmpty()) {
-            size += BinaryDictEncoderUtils.getShortcutListSize(info.mShortcutTargets);
-        }
-        if (info.mBigrams != null) {
-            for (final PendingAttribute attr : info.mBigrams) {
-                size += FormatSpec.PTNODE_FLAGS_SIZE;
-                size += BinaryDictEncoderUtils.getByteSize(attr.mAddress);
-            }
-        }
-        return size;
-    }
-
-    /**
-     * Write a node array to the stream.
-     *
-     * @param destination the stream to write.
-     * @param infos an array of PtNodeInfo to be written.
-     * @return the size written, in bytes.
-     * @throws IOException
-     */
-    static int writeNodes(final OutputStream destination, final PtNodeInfo[] infos)
-            throws IOException {
-        int size = getPtNodeCountSize(infos.length);
-        switch (getPtNodeCountSize(infos.length)) {
-            case 1:
-                destination.write((byte)infos.length);
-                break;
-            case 2:
-                final int encodedPtNodeCount =
-                        infos.length | FormatSpec.LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG;
-                destination.write((byte)(encodedPtNodeCount >> 8));
-                destination.write((byte)(encodedPtNodeCount & 0xFF));
-                break;
-            default:
-                throw new RuntimeException("Invalid node count size.");
-        }
-        for (final PtNodeInfo info : infos) size += writePtNode(destination, info);
-        writeSInt24ToStream(destination, FormatSpec.NO_FORWARD_LINK_ADDRESS);
-        return size + FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
+        final int encodedPtNodeCount = (countSize == 2) ?
+                (ptNodeCount | FormatSpec.LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG) : ptNodeCount;
+        BinaryDictEncoderUtils.writeUIntToStream(destination, encodedPtNodeCount, countSize);
+        return countSize;
     }
 
     private static final int HEADER_READING_BUFFER_SIZE = 16384;
@@ -482,6 +309,7 @@
      * @param file The file to read.
      * @param offset The offset in the file where to start reading the data.
      * @param length The length of the data file.
+     * @return the header of the specified dictionary file.
      */
     private static FileHeader getDictionaryFileHeader(
             final File file, final long offset, final long length)
@@ -503,6 +331,9 @@
                     }
                 }
         );
+        if (dictDecoder == null) {
+            return null;
+        }
         return dictDecoder.readHeader();
     }
 
@@ -529,7 +360,7 @@
      * Helper method to check whether the node is moved.
      */
     public static boolean isMovedPtNode(final int flags, final FormatOptions options) {
-        return options.mSupportsDynamicUpdate
+        return options.supportsDynamicUpdate()
                 && ((flags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) == FormatSpec.FLAG_IS_MOVED);
     }
 
@@ -538,14 +369,14 @@
      */
     public static boolean supportsDynamicUpdate(final FormatOptions options) {
         return options.mVersion >= FormatSpec.FIRST_VERSION_WITH_DYNAMIC_UPDATE
-                && options.mSupportsDynamicUpdate;
+                && options.supportsDynamicUpdate();
     }
 
     /**
      * Helper method to check whether the node is deleted.
      */
     public static boolean isDeletedPtNode(final int flags, final FormatOptions formatOptions) {
-        return formatOptions.mSupportsDynamicUpdate
+        return formatOptions.supportsDynamicUpdate()
                 && ((flags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) == FormatSpec.FLAG_IS_DELETED);
     }
 
@@ -568,7 +399,7 @@
 
     static int getChildrenAddressSize(final int optionFlags,
             final FormatOptions formatOptions) {
-        if (formatOptions.mSupportsDynamicUpdate) return FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
+        if (formatOptions.supportsDynamicUpdate()) return FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
         switch (optionFlags & FormatSpec.MASK_CHILDREN_ADDRESS_TYPE) {
             case FormatSpec.FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE:
                 return 1;
diff --git a/java/src/com/android/inputmethod/latin/makedict/DictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/DictDecoder.java
index 3dbeee0..b4838f0 100644
--- a/java/src/com/android/inputmethod/latin/makedict/DictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/DictDecoder.java
@@ -35,6 +35,7 @@
 /**
  * An interface of binary dictionary decoders.
  */
+// TODO: Straighten out responsibility for the buffer's file pointer.
 public interface DictDecoder {
 
     /**
@@ -43,7 +44,7 @@
     public FileHeader readHeader() throws IOException, UnsupportedFormatException;
 
     /**
-     * Reads PtNode from nodeAddress.
+     * Reads PtNode from ptNodePos.
      * @param ptNodePos the position of PtNode.
      * @param formatOptions the format options.
      * @return PtNodeInfo.
@@ -127,7 +128,8 @@
      * Opens the dictionary file and makes DictBuffer.
      */
     @UsedForTesting
-    public void openDictBuffer() throws FileNotFoundException, IOException;
+    public void openDictBuffer() throws FileNotFoundException, IOException,
+            UnsupportedFormatException;
     @UsedForTesting
     public boolean isDictBufferOpen();
 
@@ -228,4 +230,9 @@
     }
 
     public void skipPtNode(final FormatOptions formatOptions);
+
+    /**
+     * @return whether this decoder has a valid binary dictionary that it can decode.
+     */
+    public boolean hasValidRawBinaryDictionary();
 }
diff --git a/java/src/com/android/inputmethod/latin/makedict/DictUpdater.java b/java/src/com/android/inputmethod/latin/makedict/DictUpdater.java
deleted file mode 100644
index c4f7ec9..0000000
--- a/java/src/com/android/inputmethod/latin/makedict/DictUpdater.java
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.makedict;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
-
-import java.io.IOException;
-import java.util.ArrayList;
-
-/**
- * An interface of a binary dictionary updater.
- */
-@UsedForTesting
-public interface DictUpdater extends DictDecoder {
-
-    /**
-     * Deletes the word from the binary dictionary.
-     *
-     * @param word the word to be deleted.
-     */
-    @UsedForTesting
-    public void deleteWord(final String word) throws IOException, UnsupportedFormatException;
-
-    /**
-     * Inserts a word into a binary dictionary.
-     *
-     * @param word the word to be inserted.
-     * @param frequency the frequency of the new word.
-     * @param bigramStrings bigram list, or null if none.
-     * @param shortcuts shortcut list, or null if none.
-     * @param isBlackListEntry whether this should be a blacklist entry.
-     */
-    // TODO: Support batch insertion.
-    @UsedForTesting
-    public void insertWord(final String word, final int frequency,
-            final ArrayList<WeightedString> bigramStrings,
-            final ArrayList<WeightedString> shortcuts, final boolean isNotAWord,
-            final boolean isBlackListEntry) throws IOException, UnsupportedFormatException;
-}
diff --git a/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
deleted file mode 100644
index 28da9ff..0000000
--- a/java/src/com/android/inputmethod/latin/makedict/DynamicBinaryDictIOUtils.java
+++ /dev/null
@@ -1,492 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.makedict;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
-import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
-import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
-import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
-import com.android.inputmethod.latin.utils.CollectionUtils;
-
-import java.io.IOException;
-import java.io.OutputStream;
-import java.util.ArrayList;
-import java.util.Arrays;
-
-/**
- * The utility class to help dynamic updates on the binary dictionary.
- *
- * All the methods in this class are static.
- */
-@UsedForTesting
-public final class DynamicBinaryDictIOUtils {
-    private static final boolean DBG = false;
-    private static final int MAX_JUMPS = 10000;
-
-    private DynamicBinaryDictIOUtils() {
-        // This utility class is not publicly instantiable.
-    }
-
-    /* package */ static int markAsDeleted(final int flags) {
-        return (flags & (~FormatSpec.MASK_CHILDREN_ADDRESS_TYPE)) | FormatSpec.FLAG_IS_DELETED;
-    }
-
-    /**
-     * Update a parent address in a PtNode that is referred to by ptNodeOriginAddress.
-     *
-     * @param dictUpdater the DictUpdater to write.
-     * @param ptNodeOriginAddress the address of the PtNode.
-     * @param newParentAddress the absolute address of the parent.
-     * @param formatOptions file format options.
-     */
-    private static void updateParentAddress(final Ver3DictUpdater dictUpdater,
-            final int ptNodeOriginAddress, final int newParentAddress,
-            final FormatOptions formatOptions) {
-        final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
-        final int originalPosition = dictBuffer.position();
-        dictBuffer.position(ptNodeOriginAddress);
-        if (!formatOptions.mSupportsDynamicUpdate) {
-            throw new RuntimeException("this file format does not support parent addresses");
-        }
-        final int flags = dictBuffer.readUnsignedByte();
-        if (BinaryDictIOUtils.isMovedPtNode(flags, formatOptions)) {
-            // If the node is moved, the parent address is stored in the destination node.
-            // We are guaranteed to process the destination node later, so there is no need to
-            // update anything here.
-            dictBuffer.position(originalPosition);
-            return;
-        }
-        if (DBG) {
-            MakedictLog.d("update parent address flags=" + flags + ", " + ptNodeOriginAddress);
-        }
-        final int parentOffset = newParentAddress - ptNodeOriginAddress;
-        BinaryDictIOUtils.writeSInt24ToBuffer(dictBuffer, parentOffset);
-        dictBuffer.position(originalPosition);
-    }
-
-    /**
-     * Update parent addresses in a node array stored at ptNodeOriginAddress.
-     *
-     * @param dictUpdater the DictUpdater to be modified.
-     * @param ptNodeOriginAddress the address of the node array to update.
-     * @param newParentAddress the address to be written.
-     * @param formatOptions file format options.
-     */
-    private static void updateParentAddresses(final Ver3DictUpdater dictUpdater,
-            final int ptNodeOriginAddress, final int newParentAddress,
-            final FormatOptions formatOptions) {
-        final int originalPosition = dictUpdater.getPosition();
-        dictUpdater.setPosition(ptNodeOriginAddress);
-        do {
-            final int count = dictUpdater.readPtNodeCount();
-            for (int i = 0; i < count; ++i) {
-                updateParentAddress(dictUpdater, dictUpdater.getPosition(), newParentAddress,
-                        formatOptions);
-                dictUpdater.skipPtNode(formatOptions);
-            }
-            if (!dictUpdater.readAndFollowForwardLink()) break;
-            if (dictUpdater.getPosition() == FormatSpec.NO_FORWARD_LINK_ADDRESS) break;
-        } while (formatOptions.mSupportsDynamicUpdate);
-        dictUpdater.setPosition(originalPosition);
-    }
-
-    /**
-     * Update a children address in a PtNode that is addressed by ptNodeOriginAddress.
-     *
-     * @param dictUpdater the DictUpdater to write.
-     * @param ptNodeOriginAddress the address of the PtNode.
-     * @param newChildrenAddress the absolute address of the child.
-     * @param formatOptions file format options.
-     */
-    private static void updateChildrenAddress(final Ver3DictUpdater dictUpdater,
-            final int ptNodeOriginAddress, final int newChildrenAddress,
-            final FormatOptions formatOptions) {
-        final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
-        final int originalPosition = dictBuffer.position();
-        dictBuffer.position(ptNodeOriginAddress);
-        final int flags = dictBuffer.readUnsignedByte();
-        BinaryDictDecoderUtils.readParentAddress(dictBuffer, formatOptions);
-        BinaryDictIOUtils.skipString(dictBuffer, (flags & FormatSpec.FLAG_HAS_MULTIPLE_CHARS) != 0);
-        if ((flags & FormatSpec.FLAG_IS_TERMINAL) != 0) dictBuffer.readUnsignedByte();
-        final int childrenOffset = newChildrenAddress == FormatSpec.NO_CHILDREN_ADDRESS
-                ? FormatSpec.NO_CHILDREN_ADDRESS : newChildrenAddress - dictBuffer.position();
-        BinaryDictIOUtils.writeSInt24ToBuffer(dictBuffer, childrenOffset);
-        dictBuffer.position(originalPosition);
-    }
-
-    /**
-     * Helper method to move a PtNode to the tail of the file.
-     */
-    private static int movePtNode(final OutputStream destination,
-            final Ver3DictUpdater dictUpdater, final PtNodeInfo info,
-            final int nodeArrayOriginAddress, final int oldNodeAddress,
-            final FormatOptions formatOptions) throws IOException {
-        final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
-        updateParentAddress(dictUpdater, oldNodeAddress, dictBuffer.limit() + 1, formatOptions);
-        dictBuffer.position(oldNodeAddress);
-        final int currentFlags = dictBuffer.readUnsignedByte();
-        dictBuffer.position(oldNodeAddress);
-        dictBuffer.put((byte)(FormatSpec.FLAG_IS_MOVED | (currentFlags
-                & (~FormatSpec.MASK_MOVE_AND_DELETE_FLAG))));
-        int size = FormatSpec.PTNODE_FLAGS_SIZE;
-        updateForwardLink(dictUpdater, nodeArrayOriginAddress, dictBuffer.limit(), formatOptions);
-        size += BinaryDictIOUtils.writeNodes(destination, new PtNodeInfo[] { info });
-        return size;
-    }
-
-    @SuppressWarnings("unused")
-    private static void updateForwardLink(final Ver3DictUpdater dictUpdater,
-            final int nodeArrayOriginAddress, final int newNodeArrayAddress,
-            final FormatOptions formatOptions) {
-        final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
-        dictUpdater.setPosition(nodeArrayOriginAddress);
-        int jumpCount = 0;
-        while (jumpCount++ < MAX_JUMPS) {
-            final int count = dictUpdater.readPtNodeCount();
-            for (int i = 0; i < count; ++i) {
-                dictUpdater.readPtNode(dictUpdater.getPosition(), formatOptions);
-            }
-            final int forwardLinkAddress = dictBuffer.readUnsignedInt24();
-            if (forwardLinkAddress == FormatSpec.NO_FORWARD_LINK_ADDRESS) {
-                dictBuffer.position(dictBuffer.position() - FormatSpec.FORWARD_LINK_ADDRESS_SIZE);
-                BinaryDictIOUtils.writeSInt24ToBuffer(dictBuffer, newNodeArrayAddress);
-                return;
-            }
-            dictBuffer.position(forwardLinkAddress);
-        }
-        if (DBG && jumpCount >= MAX_JUMPS) {
-            throw new RuntimeException("too many jumps, probably a bug.");
-        }
-    }
-
-    /**
-     * Move a PtNode that is referred to by oldPtNodeOrigin to the tail of the file, and set the
-     * children address to the byte after the PtNode.
-     *
-     * @param fileEndAddress the address of the tail of the file.
-     * @param codePoints the characters to put inside the PtNode.
-     * @param length how many code points to read from codePoints.
-     * @param flags the flags for this PtNode.
-     * @param frequency the frequency of this terminal.
-     * @param parentAddress the address of the parent PtNode of this PtNode.
-     * @param shortcutTargets the shortcut targets for this PtNode.
-     * @param bigrams the bigrams for this PtNode.
-     * @param destination the stream representing the tail of the file.
-     * @param dictUpdater the DictUpdater.
-     * @param oldPtNodeArrayOrigin the origin of the old PtNode array this PtNode was a part of.
-     * @param oldPtNodeOrigin the old origin where this PtNode used to be stored.
-     * @param formatOptions format options for this dictionary.
-     * @return the size written, in bytes.
-     * @throws IOException if the file can't be accessed
-     */
-    private static int movePtNode(final int fileEndAddress, final int[] codePoints,
-            final int length, final int flags, final int frequency, final int parentAddress,
-            final ArrayList<WeightedString> shortcutTargets,
-            final ArrayList<PendingAttribute> bigrams, final OutputStream destination,
-            final Ver3DictUpdater dictUpdater, final int oldPtNodeArrayOrigin,
-            final int oldPtNodeOrigin, final FormatOptions formatOptions) throws IOException {
-        int size = 0;
-        final int newPtNodeOrigin = fileEndAddress + 1;
-        final int[] writtenCharacters = Arrays.copyOfRange(codePoints, 0, length);
-        final PtNodeInfo tmpInfo = new PtNodeInfo(newPtNodeOrigin, -1 /* endAddress */,
-                flags, writtenCharacters, frequency, parentAddress, FormatSpec.NO_CHILDREN_ADDRESS,
-                shortcutTargets, bigrams);
-        size = BinaryDictIOUtils.computePtNodeSize(tmpInfo, formatOptions);
-        final PtNodeInfo newInfo = new PtNodeInfo(newPtNodeOrigin, newPtNodeOrigin + size,
-                flags, writtenCharacters, frequency, parentAddress,
-                fileEndAddress + 1 + size + FormatSpec.FORWARD_LINK_ADDRESS_SIZE, shortcutTargets,
-                bigrams);
-        movePtNode(destination, dictUpdater, newInfo, oldPtNodeArrayOrigin, oldPtNodeOrigin,
-                formatOptions);
-        return 1 + size + FormatSpec.FORWARD_LINK_ADDRESS_SIZE;
-    }
-
-    /**
-     * Converts a list of WeightedString to a list of PendingAttribute.
-     */
-    public static ArrayList<PendingAttribute> resolveBigramPositions(final DictUpdater dictUpdater,
-            final ArrayList<WeightedString> bigramStrings)
-                    throws IOException, UnsupportedFormatException {
-        if (bigramStrings == null) return CollectionUtils.newArrayList();
-        final ArrayList<PendingAttribute> bigrams = CollectionUtils.newArrayList();
-        for (final WeightedString bigram : bigramStrings) {
-            final int pos = dictUpdater.getTerminalPosition(bigram.mWord);
-            if (pos == FormatSpec.NOT_VALID_WORD) {
-                // TODO: figure out what is the correct thing to do here.
-            } else {
-                bigrams.add(new PendingAttribute(bigram.mFrequency, pos));
-            }
-        }
-        return bigrams;
-    }
-
-    /**
-     * Insert a word into a binary dictionary.
-     *
-     * @param dictUpdater the dict updater.
-     * @param destination a stream to the underlying file, with the pointer at the end of the file.
-     * @param word the word to insert.
-     * @param frequency the frequency of the new word.
-     * @param bigramStrings bigram list, or null if none.
-     * @param shortcuts shortcut list, or null if none.
-     * @param isBlackListEntry whether this should be a blacklist entry.
-     * @throws IOException if the file can't be accessed.
-     * @throws UnsupportedFormatException if the existing dictionary is in an unexpected format.
-     */
-    // TODO: Support batch insertion.
-    // TODO: Remove @UsedForTesting once UserHistoryDictionary is implemented by BinaryDictionary.
-    @UsedForTesting
-    public static void insertWord(final Ver3DictUpdater dictUpdater,
-            final OutputStream destination, final String word, final int frequency,
-            final ArrayList<WeightedString> bigramStrings,
-            final ArrayList<WeightedString> shortcuts, final boolean isNotAWord,
-            final boolean isBlackListEntry)
-                    throws IOException, UnsupportedFormatException {
-        final ArrayList<PendingAttribute> bigrams = resolveBigramPositions(dictUpdater,
-                bigramStrings);
-        final DictBuffer dictBuffer = dictUpdater.getDictBuffer();
-
-        final boolean isTerminal = true;
-        final boolean hasBigrams = !bigrams.isEmpty();
-        final boolean hasShortcuts = shortcuts != null && !shortcuts.isEmpty();
-
-        // find the insert position of the word.
-        if (dictBuffer.position() != 0) dictBuffer.position(0);
-        final FileHeader fileHeader = dictUpdater.readHeader();
-
-        int wordPos = 0, address = dictBuffer.position(), nodeOriginAddress = dictBuffer.position();
-        final int[] codePoints = FusionDictionary.getCodePoints(word);
-        final int wordLen = codePoints.length;
-
-        for (int depth = 0; depth < Constants.DICTIONARY_MAX_WORD_LENGTH; ++depth) {
-            if (wordPos >= wordLen) break;
-            nodeOriginAddress = dictBuffer.position();
-            int nodeParentAddress = -1;
-            final int ptNodeCount = BinaryDictDecoderUtils.readPtNodeCount(dictBuffer);
-            boolean foundNextNode = false;
-
-            for (int i = 0; i < ptNodeCount; ++i) {
-                address = dictBuffer.position();
-                final PtNodeInfo currentInfo = dictUpdater.readPtNode(address,
-                        fileHeader.mFormatOptions);
-                final boolean isMovedNode = BinaryDictIOUtils.isMovedPtNode(currentInfo.mFlags,
-                        fileHeader.mFormatOptions);
-                if (isMovedNode) continue;
-                nodeParentAddress = (currentInfo.mParentAddress == FormatSpec.NO_PARENT_ADDRESS)
-                        ? FormatSpec.NO_PARENT_ADDRESS : currentInfo.mParentAddress + address;
-                boolean matched = true;
-                for (int p = 0; p < currentInfo.mCharacters.length; ++p) {
-                    if (wordPos + p >= wordLen) {
-                        /*
-                         * splitting
-                         * before
-                         *  abcd - ef
-                         *
-                         * insert "abc"
-                         *
-                         * after
-                         *  abc - d - ef
-                         */
-                        final int newNodeAddress = dictBuffer.limit();
-                        final int flags = BinaryDictEncoderUtils.makePtNodeFlags(p > 1,
-                                isTerminal, 0, hasShortcuts, hasBigrams, false /* isNotAWord */,
-                                false /* isBlackListEntry */, fileHeader.mFormatOptions);
-                        int written = movePtNode(newNodeAddress, currentInfo.mCharacters, p, flags,
-                                frequency, nodeParentAddress, shortcuts, bigrams, destination,
-                                dictUpdater, nodeOriginAddress, address, fileHeader.mFormatOptions);
-
-                        final int[] characters2 = Arrays.copyOfRange(currentInfo.mCharacters, p,
-                                currentInfo.mCharacters.length);
-                        if (currentInfo.mChildrenAddress != FormatSpec.NO_CHILDREN_ADDRESS) {
-                            updateParentAddresses(dictUpdater, currentInfo.mChildrenAddress,
-                                    newNodeAddress + written + 1, fileHeader.mFormatOptions);
-                        }
-                        final PtNodeInfo newInfo2 = new PtNodeInfo(
-                                newNodeAddress + written + 1, -1 /* endAddress */,
-                                currentInfo.mFlags, characters2, currentInfo.mFrequency,
-                                newNodeAddress + 1, currentInfo.mChildrenAddress,
-                                currentInfo.mShortcutTargets, currentInfo.mBigrams);
-                        BinaryDictIOUtils.writeNodes(destination, new PtNodeInfo[] { newInfo2 });
-                        return;
-                    } else if (codePoints[wordPos + p] != currentInfo.mCharacters[p]) {
-                        if (p > 0) {
-                            /*
-                             * splitting
-                             * before
-                             *   ab - cd
-                             *
-                             * insert "ac"
-                             *
-                             * after
-                             *   a - b - cd
-                             *     |
-                             *     - c
-                             */
-
-                            final int newNodeAddress = dictBuffer.limit();
-                            final int childrenAddress = currentInfo.mChildrenAddress;
-
-                            // move prefix
-                            final int prefixFlags = BinaryDictEncoderUtils.makePtNodeFlags(p > 1,
-                                    false /* isTerminal */, 0 /* childrenAddressSize*/,
-                                    false /* hasShortcut */, false /* hasBigrams */,
-                                    false /* isNotAWord */, false /* isBlackListEntry */,
-                                    fileHeader.mFormatOptions);
-                            int written = movePtNode(newNodeAddress, currentInfo.mCharacters, p,
-                                    prefixFlags, -1 /* frequency */, nodeParentAddress, null, null,
-                                    destination, dictUpdater, nodeOriginAddress, address,
-                                    fileHeader.mFormatOptions);
-
-                            final int[] suffixCharacters = Arrays.copyOfRange(
-                                    currentInfo.mCharacters, p, currentInfo.mCharacters.length);
-                            if (currentInfo.mChildrenAddress != FormatSpec.NO_CHILDREN_ADDRESS) {
-                                updateParentAddresses(dictUpdater, currentInfo.mChildrenAddress,
-                                        newNodeAddress + written + 1, fileHeader.mFormatOptions);
-                            }
-                            final int suffixFlags = BinaryDictEncoderUtils.makePtNodeFlags(
-                                    suffixCharacters.length > 1,
-                                    (currentInfo.mFlags & FormatSpec.FLAG_IS_TERMINAL) != 0,
-                                    0 /* childrenAddressSize */,
-                                    (currentInfo.mFlags & FormatSpec.FLAG_HAS_SHORTCUT_TARGETS)
-                                            != 0,
-                                    (currentInfo.mFlags & FormatSpec.FLAG_HAS_BIGRAMS) != 0,
-                                    isNotAWord, isBlackListEntry, fileHeader.mFormatOptions);
-                            final PtNodeInfo suffixInfo = new PtNodeInfo(
-                                    newNodeAddress + written + 1, -1 /* endAddress */, suffixFlags,
-                                    suffixCharacters, currentInfo.mFrequency, newNodeAddress + 1,
-                                    currentInfo.mChildrenAddress, currentInfo.mShortcutTargets,
-                                    currentInfo.mBigrams);
-                            written += BinaryDictIOUtils.computePtNodeSize(suffixInfo,
-                                    fileHeader.mFormatOptions) + 1;
-
-                            final int[] newCharacters = Arrays.copyOfRange(codePoints, wordPos + p,
-                                    codePoints.length);
-                            final int flags = BinaryDictEncoderUtils.makePtNodeFlags(
-                                    newCharacters.length > 1, isTerminal,
-                                    0 /* childrenAddressSize */, hasShortcuts, hasBigrams,
-                                    isNotAWord, isBlackListEntry, fileHeader.mFormatOptions);
-                            final PtNodeInfo newInfo = new PtNodeInfo(
-                                    newNodeAddress + written, -1 /* endAddress */, flags,
-                                    newCharacters, frequency, newNodeAddress + 1,
-                                    FormatSpec.NO_CHILDREN_ADDRESS, shortcuts, bigrams);
-                            BinaryDictIOUtils.writeNodes(destination,
-                                    new PtNodeInfo[] { suffixInfo, newInfo });
-                            return;
-                        }
-                        matched = false;
-                        break;
-                    }
-                }
-
-                if (matched) {
-                    if (wordPos + currentInfo.mCharacters.length == wordLen) {
-                        // the word exists in the dictionary.
-                        // only update the PtNode.
-                        final int newNodeAddress = dictBuffer.limit();
-                        final boolean hasMultipleChars = currentInfo.mCharacters.length > 1;
-                        final int flags = BinaryDictEncoderUtils.makePtNodeFlags(hasMultipleChars,
-                                isTerminal, 0 /* childrenAddressSize */, hasShortcuts, hasBigrams,
-                                isNotAWord, isBlackListEntry, fileHeader.mFormatOptions);
-                        final PtNodeInfo newInfo = new PtNodeInfo(newNodeAddress + 1,
-                                -1 /* endAddress */, flags, currentInfo.mCharacters, frequency,
-                                nodeParentAddress, currentInfo.mChildrenAddress, shortcuts,
-                                bigrams);
-                        movePtNode(destination, dictUpdater, newInfo, nodeOriginAddress, address,
-                                fileHeader.mFormatOptions);
-                        return;
-                    }
-                    wordPos += currentInfo.mCharacters.length;
-                    if (currentInfo.mChildrenAddress == FormatSpec.NO_CHILDREN_ADDRESS) {
-                        /*
-                         * found the prefix of the word.
-                         * make new PtNode and link to the PtNode from this PtNode.
-                         *
-                         * before
-                         * ab - cd
-                         *
-                         * insert "abcde"
-                         *
-                         * after
-                         * ab - cd - e
-                         */
-                        final int newNodeArrayAddress = dictBuffer.limit();
-                        updateChildrenAddress(dictUpdater, address, newNodeArrayAddress,
-                                fileHeader.mFormatOptions);
-                        final int newNodeAddress = newNodeArrayAddress + 1;
-                        final boolean hasMultipleChars = (wordLen - wordPos) > 1;
-                        final int flags = BinaryDictEncoderUtils.makePtNodeFlags(hasMultipleChars,
-                                isTerminal, 0 /* childrenAddressSize */, hasShortcuts, hasBigrams,
-                                isNotAWord, isBlackListEntry, fileHeader.mFormatOptions);
-                        final int[] characters = Arrays.copyOfRange(codePoints, wordPos, wordLen);
-                        final PtNodeInfo newInfo = new PtNodeInfo(newNodeAddress, -1, flags,
-                                characters, frequency, address, FormatSpec.NO_CHILDREN_ADDRESS,
-                                shortcuts, bigrams);
-                        BinaryDictIOUtils.writeNodes(destination, new PtNodeInfo[] { newInfo });
-                        return;
-                    }
-                    dictBuffer.position(currentInfo.mChildrenAddress);
-                    foundNextNode = true;
-                    break;
-                }
-            }
-
-            if (foundNextNode) continue;
-
-            // reached the end of the array.
-            final int linkAddressPosition = dictBuffer.position();
-            int nextLink = dictBuffer.readUnsignedInt24();
-            if ((nextLink & FormatSpec.MSB24) != 0) {
-                nextLink = -(nextLink & FormatSpec.SINT24_MAX);
-            }
-            if (nextLink == FormatSpec.NO_FORWARD_LINK_ADDRESS) {
-                /*
-                 * expand this node.
-                 *
-                 * before
-                 * ab - cd
-                 *
-                 * insert "abef"
-                 *
-                 * after
-                 * ab - cd
-                 *    |
-                 *    - ef
-                 */
-
-                // change the forward link address.
-                final int newNodeAddress = dictBuffer.limit();
-                dictBuffer.position(linkAddressPosition);
-                BinaryDictIOUtils.writeSInt24ToBuffer(dictBuffer, newNodeAddress);
-
-                final int[] characters = Arrays.copyOfRange(codePoints, wordPos, wordLen);
-                final int flags = BinaryDictEncoderUtils.makePtNodeFlags(characters.length > 1,
-                        isTerminal, 0 /* childrenAddressSize */, hasShortcuts, hasBigrams,
-                        isNotAWord, isBlackListEntry, fileHeader.mFormatOptions);
-                final PtNodeInfo newInfo = new PtNodeInfo(newNodeAddress + 1,
-                        -1 /* endAddress */, flags, characters, frequency, nodeParentAddress,
-                        FormatSpec.NO_CHILDREN_ADDRESS, shortcuts, bigrams);
-                BinaryDictIOUtils.writeNodes(destination, new PtNodeInfo[]{ newInfo });
-                return;
-            } else {
-                depth--;
-                dictBuffer.position(nextLink);
-            }
-        }
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index b56234f..437fa94 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -40,12 +40,8 @@
      * p | not used                                3 bits
      * t | each unigram and bigram entry has a time stamp?
      * i |                                         1 bit, 1 = yes, 0 = no : CONTAINS_TIMESTAMP_FLAG
-     * o | has bigrams ?                           1 bit, 1 = yes, 0 = no : CONTAINS_BIGRAMS_FLAG
-     * n | FRENCH_LIGATURE_PROCESSING_FLAG
-     * f | supports dynamic updates ?              1 bit, 1 = yes, 0 = no : SUPPORTS_DYNAMIC_UPDATE
-     * l | GERMAN_UMLAUT_PROCESSING_FLAG
-     * a |
-     * gs
+     * o |
+     * nflags
      *
      * h |
      * e | size of the file header, 4bytes
@@ -82,45 +78,36 @@
      * s
      *
      * f |
-     * o | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header)
-     * r |     forward link address, 3byte
-     * w | 1 byte = bbbbbbbb match
-     * a |   case 1xxxxxxx => -((xxxxxxx << 16) + (next byte << 8) + next byte)
-     * r |   otherwise => (xxxxxxx << 16) + (next byte << 8) + next byte
-     * d |
-     * linkaddress
+     * o | forward link address, 3byte
+     * r | 1 byte = bbbbbbbb match
+     * w |   case 1xxxxxxx => -((xxxxxxx << 16) + (next byte << 8) + next byte)
+     * a |   otherwise => (xxxxxxx << 16) + (next byte << 8) + next byte
+     * r |
+     * dlinkaddress
      */
 
     /* Node (FusionDictionary.PtNode) layout is as follows:
-     *   | IF !SUPPORTS_DYNAMIC_UPDATE
-     *   |   addressType                    xx               : mask with MASK_CHILDREN_ADDRESS_TYPE
-     *   |                          2 bits, 00 = no children : FLAG_CHILDREN_ADDRESS_TYPE_NOADDRESS
-     * f |                                  01 = 1 byte      : FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE
-     * l |                                  10 = 2 bytes     : FLAG_CHILDREN_ADDRESS_TYPE_TWOBYTES
-     * a |                                  11 = 3 bytes     : FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
-     * g | ELSE
-     * s |   is moved ?             2 bits, 11 = no          : FLAG_IS_NOT_MOVED
-     *   |                            This must be the same as FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
-     *   |                                  01 = yes         : FLAG_IS_MOVED
-     *   |                        the new address is stored in the same place as the parent address
-     *   |   is deleted?                    10 = yes         : FLAG_IS_DELETED
-     *   | has several chars ?         1 bit, 1 = yes, 0 = no   : FLAG_HAS_MULTIPLE_CHARS
-     *   | has a terminal ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_TERMINAL
-     *   | has shortcut targets ?      1 bit, 1 = yes, 0 = no   : FLAG_HAS_SHORTCUT_TARGETS
+     *   | is moved ?             2 bits, 11 = no          : FLAG_IS_NOT_MOVED
+     *   |                          This must be the same as FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES
+     *   |                                01 = yes         : FLAG_IS_MOVED
+     * f |                      the new address is stored in the same place as the parent address
+     * l | is deleted?                    10 = yes         : FLAG_IS_DELETED
+     * a | has several chars ?         1 bit, 1 = yes, 0 = no   : FLAG_HAS_MULTIPLE_CHARS
+     * g | has a terminal ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_TERMINAL
+     * s | has shortcut targets ?      1 bit, 1 = yes, 0 = no   : FLAG_HAS_SHORTCUT_TARGETS
      *   | has bigrams ?               1 bit, 1 = yes, 0 = no   : FLAG_HAS_BIGRAMS
      *   | is not a word ?             1 bit, 1 = yes, 0 = no   : FLAG_IS_NOT_A_WORD
      *   | is blacklisted ?            1 bit, 1 = yes, 0 = no   : FLAG_IS_BLACKLISTED
      *
      * p |
-     * a | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header)
-     * r |     parent address, 3byte
-     * e | 1 byte = bbbbbbbb match
-     * n |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
-     * t |   otherwise => (bbbbbbbb << 16) + (next byte << 8) + next byte
-     * a | This address is relative to the head of the PtNode.
-     * d | If the node doesn't have a parent, this field is set to 0.
+     * a | parent address, 3byte
+     * r | 1 byte = bbbbbbbb match
+     * e |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
+     * n |   otherwise => (bbbbbbbb << 16) + (next byte << 8) + next byte
+     * t | This address is relative to the head of the PtNode.
+     * a | If the node doesn't have a parent, this field is set to 0.
      * d |
-     * ress
+     * dress
      *
      * c | IF FLAG_HAS_MULTIPLE_CHARS
      * h |   char, char, char, char    n * (1 or 3 bytes) : use PtNodeInfo for i/o helpers
@@ -134,23 +121,16 @@
      * e |   frequency                 1 byte
      * q |
      *
-     * c | IF SUPPORTS_DYNAMIC_UPDATE
-     * h |   children address, 3 bytes
-     * i |   1 byte = bbbbbbbb match
-     * l |     case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
-     * d |     otherwise => (bbbbbbbb<<16) + (next byte << 8) + next byte
-     * r |   if this node doesn't have children, this field is set to 0.
-     * e |     (see BinaryDictEncoderUtils#writeVariableSignedAddress)
-     * n | ELSIF 00 = FLAG_CHILDREN_ADDRESS_TYPE_NOADDRESS == addressType
-     * a |   // nothing
-     * d | ELSIF 01 = FLAG_CHILDREN_ADDRESS_TYPE_ONEBYTE == addressType
-     * d |   children address, 1 byte
-     * r | ELSIF 10 = FLAG_CHILDREN_ADDRESS_TYPE_TWOBYTES == addressType
-     * e |   children address, 2 bytes
-     * s | ELSE // 11 = FLAG_CHILDREN_ADDRESS_TYPE_THREEBYTES = addressType
-     * s |   children address, 3 bytes
-     *   | END
-     *   | This address is relative to the position of this field.
+     * c |
+     * h | children address, 3 bytes
+     * i | 1 byte = bbbbbbbb match
+     * l |   case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte)
+     * d |   otherwise => (bbbbbbbb<<16) + (next byte << 8) + next byte
+     * r | if this node doesn't have children, this field is set to 0.
+     * e |   (see BinaryDictEncoderUtils#writeVariableSignedAddress)
+     * n | This address is relative to the position of this field.
+     * a |
+     * ddress
      *
      *   | IF FLAG_IS_TERMINAL && FLAG_HAS_SHORTCUT_TARGETS
      *   | shortcut string list
@@ -199,20 +179,21 @@
      */
 
     public static final int MAGIC_NUMBER = 0x9BC13AFE;
-    static final int MINIMUM_SUPPORTED_VERSION = 2;
-    static final int MAXIMUM_SUPPORTED_VERSION = 4;
     static final int NOT_A_VERSION_NUMBER = -1;
     static final int FIRST_VERSION_WITH_DYNAMIC_UPDATE = 3;
     static final int FIRST_VERSION_WITH_TERMINAL_ID = 4;
-    static final int VERSION3 = 3;
-    static final int VERSION4 = 4;
+
+    // These MUST have the same values as the relevant constants in format_utils.h.
+    // From version 4 on, we use version * 100 + revision as a version number. That allows
+    // us to change the format during development while having testing devices remove
+    // older files with each upgrade, while still having a readable versioning scheme.
+    public static final int VERSION2 = 2;
+    public static final int VERSION4 = 401;
+    static final int MINIMUM_SUPPORTED_VERSION = VERSION2;
+    static final int MAXIMUM_SUPPORTED_VERSION = VERSION4;
 
     // These options need to be the same numeric values as the one in the native reading code.
-    static final int GERMAN_UMLAUT_PROCESSING_FLAG = 0x1;
     // TODO: Make the native reading code read this variable.
-    static final int SUPPORTS_DYNAMIC_UPDATE = 0x2;
-    static final int FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
-    static final int CONTAINS_BIGRAMS_FLAG = 0x8;
     static final int CONTAINS_TIMESTAMP_FLAG = 0x10;
 
     // TODO: Make this value adaptative to content data, store it in the header, and
@@ -263,8 +244,10 @@
     static final int PTNODE_ATTRIBUTE_MAX_ADDRESS_SIZE = 3;
     static final int PTNODE_SHORTCUT_LIST_SIZE_SIZE = 2;
 
-    // These values are used only by version 4 or later.
+    // These values are used only by version 4 or later. They MUST match the definitions in
+    // ver4_dict_constants.cpp.
     static final String TRIE_FILE_EXTENSION = ".trie";
+    public static final String HEADER_FILE_EXTENSION = ".header";
     static final String FREQ_FILE_EXTENSION = ".freq";
     static final String UNIGRAM_TIMESTAMP_FILE_EXTENSION = ".timestamp";
     // tat = Terminal Address Table
@@ -278,9 +261,9 @@
     static final int UNIGRAM_TIMESTAMP_SIZE = 4;
 
     // With the English main dictionary as of October 2013, the size of bigram address table is
-    // is 584KB with the block size being 4.
-    // This is 91% of that of full address table.
-    static final int BIGRAM_ADDRESS_TABLE_BLOCK_SIZE = 4;
+    // is 345KB with the block size being 16.
+    // This is 54% of that of full address table.
+    static final int BIGRAM_ADDRESS_TABLE_BLOCK_SIZE = 16;
     static final int BIGRAM_CONTENT_COUNT = 2;
     static final int BIGRAM_FREQ_CONTENT_INDEX = 0;
     static final int BIGRAM_TIMESTAMP_CONTENT_INDEX = 1;
@@ -293,7 +276,7 @@
     static final int SHORTCUT_CONTENT_COUNT = 1;
     static final int SHORTCUT_CONTENT_INDEX = 0;
     // With the English main dictionary as of October 2013, the size of shortcut address table is
-    // 29KB with the block size being 64.
+    // 26KB with the block size being 64.
     // This is only 4.4% of that of full address table.
     static final int SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE = 64;
     static final String SHORTCUT_CONTENT_ID = "_shortcut";
@@ -331,43 +314,36 @@
      */
     public static final class FormatOptions {
         public final int mVersion;
-        public final boolean mSupportsDynamicUpdate;
         public final boolean mHasTerminalId;
         public final boolean mHasTimestamp;
+
         @UsedForTesting
         public FormatOptions(final int version) {
-            this(version, false);
+            this(version, false /* hasTimestamp */);
         }
 
-        @UsedForTesting
-        public FormatOptions(final int version, final boolean supportsDynamicUpdate) {
-            this(version, supportsDynamicUpdate, false /* hasTimestamp */);
-        }
-
-        public FormatOptions(final int version, final boolean supportsDynamicUpdate,
-                final boolean hasTimestamp) {
+        public FormatOptions(final int version, final boolean hasTimestamp) {
             mVersion = version;
-            if (version < FIRST_VERSION_WITH_DYNAMIC_UPDATE && supportsDynamicUpdate) {
-                throw new RuntimeException("Dynamic updates are only supported with versions "
-                        + FIRST_VERSION_WITH_DYNAMIC_UPDATE + " and ulterior.");
-            }
-            mSupportsDynamicUpdate = supportsDynamicUpdate;
             mHasTerminalId = (version >= FIRST_VERSION_WITH_TERMINAL_ID);
             mHasTimestamp = hasTimestamp;
         }
+
+        public boolean supportsDynamicUpdate() {
+            return mVersion >= FIRST_VERSION_WITH_DYNAMIC_UPDATE;
+        }
     }
 
     /**
      * Class representing file header.
      */
     public static final class FileHeader {
-        public final int mHeaderSize;
+        public final int mBodyOffset;
         public final DictionaryOptions mDictionaryOptions;
         public final FormatOptions mFormatOptions;
         // Note that these are corresponding definitions in native code in latinime::HeaderPolicy
         // and latinime::HeaderReadWriteUtils.
-        public static final String SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE = "SUPPORTS_DYNAMIC_UPDATE";
         public static final String USES_FORGETTING_CURVE_ATTRIBUTE = "USES_FORGETTING_CURVE";
+        public static final String HAS_HISTORICAL_INFO_ATTRIBUTE = "HAS_HISTORICAL_INFO";
         public static final String ATTRIBUTE_VALUE_TRUE = "1";
 
         public static final String DICTIONARY_VERSION_ATTRIBUTE = "version";
@@ -375,10 +351,20 @@
         public static final String DICTIONARY_ID_ATTRIBUTE = "dictionary";
         private static final String DICTIONARY_DESCRIPTION_ATTRIBUTE = "description";
         public FileHeader(final int headerSize, final DictionaryOptions dictionaryOptions,
-                final FormatOptions formatOptions) {
-            mHeaderSize = headerSize;
+                final FormatOptions formatOptions) throws UnsupportedFormatException {
             mDictionaryOptions = dictionaryOptions;
             mFormatOptions = formatOptions;
+            mBodyOffset = formatOptions.mVersion < VERSION4 ? headerSize : 0;
+            if (null == getLocaleString()) {
+                throw new UnsupportedFormatException("Cannot create a FileHeader without a locale");
+            }
+            if (null == getVersion()) {
+                throw new UnsupportedFormatException(
+                        "Cannot create a FileHeader without a version");
+            }
+            if (null == getId()) {
+                throw new UnsupportedFormatException("Cannot create a FileHeader without an ID");
+            }
         }
 
         // Helper method to get the locale as a String
@@ -415,7 +401,7 @@
         if (dictFile.isDirectory()) {
             return new Ver4DictDecoder(dictFile, bufferType);
         } else if (dictFile.isFile()) {
-            return new Ver3DictDecoder(dictFile, bufferType);
+            return new Ver2DictDecoder(dictFile, bufferType);
         }
         return null;
     }
@@ -425,7 +411,7 @@
         if (dictFile.isDirectory()) {
             return new Ver4DictDecoder(dictFile, factory);
         } else if (dictFile.isFile()) {
-            return new Ver3DictDecoder(dictFile, factory);
+            return new Ver2DictDecoder(dictFile, factory);
         }
         return null;
     }
diff --git a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
index 3bb218b..fdf2ae7 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
@@ -303,14 +303,9 @@
      * Options global to the dictionary.
      */
     public static final class DictionaryOptions {
-        public final boolean mGermanUmlautProcessing;
-        public final boolean mFrenchLigatureProcessing;
         public final HashMap<String, String> mAttributes;
-        public DictionaryOptions(final HashMap<String, String> attributes,
-                final boolean germanUmlautProcessing, final boolean frenchLigatureProcessing) {
+        public DictionaryOptions(final HashMap<String, String> attributes) {
             mAttributes = attributes;
-            mGermanUmlautProcessing = germanUmlautProcessing;
-            mFrenchLigatureProcessing = frenchLigatureProcessing;
         }
         @Override
         public String toString() { // Convenience method
@@ -339,14 +334,6 @@
                 }
                 s.append("\n");
             }
-            if (mGermanUmlautProcessing) {
-                s.append(indent);
-                s.append("Needs German umlaut processing\n");
-            }
-            if (mFrenchLigatureProcessing) {
-                s.append(indent);
-                s.append("Needs French ligature processing\n");
-            }
             return s.toString();
         }
     }
@@ -701,138 +688,6 @@
     }
 
     /**
-     * Recursively count the number of nodes in a given branch of the trie.
-     *
-     * @param nodeArray the node array to count.
-     * @return the number of nodes in this branch.
-     */
-    public static int countNodeArrays(final PtNodeArray nodeArray) {
-        int size = 1;
-        for (int i = nodeArray.mData.size() - 1; i >= 0; --i) {
-            PtNode ptNode = nodeArray.mData.get(i);
-            if (null != ptNode.mChildren)
-                size += countNodeArrays(ptNode.mChildren);
-        }
-        return size;
-    }
-
-    // Recursively find out whether there are any bigrams.
-    // This can be pretty expensive especially if there aren't any (we return as soon
-    // as we find one, so it's much cheaper if there are bigrams)
-    private static boolean hasBigramsInternal(final PtNodeArray nodeArray) {
-        if (null == nodeArray) return false;
-        for (int i = nodeArray.mData.size() - 1; i >= 0; --i) {
-            PtNode ptNode = nodeArray.mData.get(i);
-            if (null != ptNode.mBigrams) return true;
-            if (hasBigramsInternal(ptNode.mChildren)) return true;
-        }
-        return false;
-    }
-
-    /**
-     * Finds out whether there are any bigrams in this dictionary.
-     *
-     * @return true if there is any bigram, false otherwise.
-     */
-    // TODO: this is expensive especially for large dictionaries without any bigram.
-    // The up side is, this is always accurate and correct and uses no memory. We should
-    // find a more efficient way of doing this, without compromising too much on memory
-    // and ease of use.
-    public boolean hasBigrams() {
-        return hasBigramsInternal(mRootNodeArray);
-    }
-
-    // Historically, the tails of the words were going to be merged to save space.
-    // However, that would prevent the code to search for a specific address in log(n)
-    // time so this was abandoned.
-    // The code is still of interest as it does add some compression to any dictionary
-    // that has no need for attributes. Implementations that does not read attributes should be
-    // able to read a dictionary with merged tails.
-    // Also, the following code does support frequencies, as in, it will only merges
-    // tails that share the same frequency. Though it would result in the above loss of
-    // performance while searching by address, it is still technically possible to merge
-    // tails that contain attributes, but this code does not take that into account - it does
-    // not compare attributes and will merge terminals with different attributes regardless.
-    public void mergeTails() {
-        MakedictLog.i("Do not merge tails");
-        return;
-
-//        MakedictLog.i("Merging PtNodes. Number of PtNodes : " + countPtNodes(root));
-//        MakedictLog.i("Number of PtNodes : " + countPtNodes(root));
-//
-//        final HashMap<String, ArrayList<PtNodeArray>> repository =
-//                  new HashMap<String, ArrayList<PtNodeArray>>();
-//        mergeTailsInner(repository, root);
-//
-//        MakedictLog.i("Number of different pseudohashes : " + repository.size());
-//        int size = 0;
-//        for (ArrayList<PtNodeArray> a : repository.values()) {
-//            size += a.size();
-//        }
-//        MakedictLog.i("Number of nodes after merge : " + (1 + size));
-//        MakedictLog.i("Recursively seen nodes : " + countNodes(root));
-    }
-
-    // The following methods are used by the deactivated mergeTails()
-//   private static boolean isEqual(PtNodeArray a, PtNodeArray b) {
-//       if (null == a && null == b) return true;
-//       if (null == a || null == b) return false;
-//       if (a.data.size() != b.data.size()) return false;
-//       final int size = a.data.size();
-//       for (int i = size - 1; i >= 0; --i) {
-//           PtNode aPtNode = a.data.get(i);
-//           PtNode bPtNode = b.data.get(i);
-//           if (aPtNode.frequency != bPtNode.frequency) return false;
-//           if (aPtNode.alternates == null && bPtNode.alternates != null) return false;
-//           if (aPtNode.alternates != null && !aPtNode.equals(bPtNode.alternates)) return false;
-//           if (!Arrays.equals(aPtNode.chars, bPtNode.chars)) return false;
-//           if (!isEqual(aPtNode.children, bPtNode.children)) return false;
-//       }
-//       return true;
-//   }
-
-//   static private HashMap<String, ArrayList<PtNodeArray>> mergeTailsInner(
-//           final HashMap<String, ArrayList<PtNodeArray>> map, final PtNodeArray nodeArray) {
-//       final ArrayList<PtNode> branches = nodeArray.data;
-//       final int nodeSize = branches.size();
-//       for (int i = 0; i < nodeSize; ++i) {
-//           PtNode ptNode = branches.get(i);
-//           if (null != ptNode.children) {
-//               String pseudoHash = getPseudoHash(ptNode.children);
-//               ArrayList<PtNodeArray> similarList = map.get(pseudoHash);
-//               if (null == similarList) {
-//                   similarList = new ArrayList<PtNodeArray>();
-//                   map.put(pseudoHash, similarList);
-//               }
-//               boolean merged = false;
-//               for (PtNodeArray similar : similarList) {
-//                   if (isEqual(ptNode.children, similar)) {
-//                       ptNode.children = similar;
-//                       merged = true;
-//                       break;
-//                   }
-//               }
-//               if (!merged) {
-//                   similarList.add(ptNode.children);
-//               }
-//               mergeTailsInner(map, ptNode.children);
-//           }
-//       }
-//       return map;
-//   }
-
-//  private static String getPseudoHash(final PtNodeArray nodeArray) {
-//      StringBuilder s = new StringBuilder();
-//      for (PtNode ptNode : nodeArray.data) {
-//          s.append(ptNode.frequency);
-//          for (int ch : ptNode.chars) {
-//              s.append(Character.toChars(ch));
-//          }
-//      }
-//      return s.toString();
-//  }
-
-    /**
      * Iterator to walk through a dictionary.
      *
      * This is purely for convenience.
diff --git a/java/src/com/android/inputmethod/latin/makedict/SparseTableContentReader.java b/java/src/com/android/inputmethod/latin/makedict/SparseTableContentReader.java
new file mode 100644
index 0000000..63e1f56
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/makedict/SparseTableContentReader.java
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.makedict;
+
+import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
+import com.android.inputmethod.latin.makedict.DictDecoder.DictionaryBufferFactory;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+/**
+ * An auxiliary class for reading SparseTable and data written by SparseTableContentWriter.
+ */
+public class SparseTableContentReader {
+
+    /**
+     * An interface of a function which is passed to SparseTableContentReader.read.
+     */
+    public interface SparseTableContentReaderInterface {
+        /**
+         * Reads data.
+         *
+         * @param buffer the DictBuffer. The position of the buffer is set to the head of data.
+         */
+        public void read(final DictBuffer buffer);
+    }
+
+    protected final int mContentCount;
+    protected final int mBlockSize;
+    protected final File mBaseDir;
+    protected final File mLookupTableFile;
+    protected final File[] mAddressTableFiles;
+    protected final File[] mContentFiles;
+    protected DictBuffer mLookupTableBuffer;
+    protected final DictBuffer[] mAddressTableBuffers;
+    private final DictBuffer[] mContentBuffers;
+    protected final DictionaryBufferFactory mFactory;
+
+    /**
+     * Sole constructor of SparseTableContentReader.
+     *
+     * @param name the name of SparseTable.
+     * @param blockSize the block size of the content table.
+     * @param baseDir the directory which contains the files of the content table.
+     * @param contentFilenames the file names of content files.
+     * @param contentSuffixes the ids of contents. These ids are used for a suffix of a name of
+     * address files and content files.
+     * @param factory the DictionaryBufferFactory which is used for opening the files.
+     */
+    public SparseTableContentReader(final String name, final int blockSize, final File baseDir,
+            final String[] contentFilenames, final String[] contentSuffixes,
+            final DictionaryBufferFactory factory) {
+        if (contentFilenames.length != contentSuffixes.length) {
+            throw new RuntimeException("The length of contentFilenames and the length of"
+                    + " contentSuffixes are different " + contentFilenames.length + ", "
+                    + contentSuffixes.length);
+        }
+        mBlockSize = blockSize;
+        mBaseDir = baseDir;
+        mFactory = factory;
+        mContentCount = contentFilenames.length;
+        mLookupTableFile = new File(baseDir, name + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
+        mAddressTableFiles = new File[mContentCount];
+        mContentFiles = new File[mContentCount];
+        for (int i = 0; i < mContentCount; ++i) {
+            mAddressTableFiles[i] = new File(mBaseDir,
+                    name + FormatSpec.CONTENT_TABLE_FILE_SUFFIX + contentSuffixes[i]);
+            mContentFiles[i] = new File(mBaseDir, contentFilenames[i] + contentSuffixes[i]);
+        }
+        mAddressTableBuffers = new DictBuffer[mContentCount];
+        mContentBuffers = new DictBuffer[mContentCount];
+    }
+
+    public void openBuffers() throws FileNotFoundException, IOException {
+        mLookupTableBuffer = mFactory.getDictionaryBuffer(mLookupTableFile);
+        for (int i = 0; i < mContentCount; ++i) {
+            mAddressTableBuffers[i] = mFactory.getDictionaryBuffer(mAddressTableFiles[i]);
+            mContentBuffers[i] = mFactory.getDictionaryBuffer(mContentFiles[i]);
+        }
+    }
+
+    /**
+     * Calls the read() callback of the reader with the appropriate buffer appropriately positioned.
+     * @param contentNumber the index in the original contentFilenames[] array.
+     * @param terminalId the terminal ID to read.
+     * @param reader the reader on which to call the callback.
+     */
+    protected void read(final int contentNumber, final int terminalId,
+            final SparseTableContentReaderInterface reader) {
+        if (terminalId < 0 || (terminalId / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES
+                >= mLookupTableBuffer.limit()) {
+            return;
+        }
+
+        mLookupTableBuffer.position((terminalId / mBlockSize) * SparseTable.SIZE_OF_INT_IN_BYTES);
+        final int indexInAddressTable = mLookupTableBuffer.readInt();
+        if (indexInAddressTable == SparseTable.NOT_EXIST) {
+            return;
+        }
+
+        mAddressTableBuffers[contentNumber].position(SparseTable.SIZE_OF_INT_IN_BYTES
+                * ((indexInAddressTable * mBlockSize) + (terminalId % mBlockSize)));
+        final int address = mAddressTableBuffers[contentNumber].readInt();
+        if (address == SparseTable.NOT_EXIST) {
+            return;
+        }
+
+        mContentBuffers[contentNumber].position(address);
+        reader.read(mContentBuffers[contentNumber]);
+    }
+}
\ No newline at end of file
diff --git a/java/src/com/android/inputmethod/latin/makedict/SparseTableContentWriter.java b/java/src/com/android/inputmethod/latin/makedict/SparseTableContentWriter.java
new file mode 100644
index 0000000..49f0fd6
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/makedict/SparseTableContentWriter.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.makedict;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * An auxiliary class for writing data associated with SparseTable to files.
+ */
+public class SparseTableContentWriter {
+    public interface SparseTableContentWriterInterface {
+        public void write(final OutputStream outStream) throws IOException;
+    }
+
+    private final int mContentCount;
+    private final SparseTable mSparseTable;
+    private final File mLookupTableFile;
+    protected final File mBaseDir;
+    private final File[] mAddressTableFiles;
+    private final File[] mContentFiles;
+    protected final OutputStream[] mContentOutStreams;
+
+    /**
+     * Sole constructor of SparseTableContentWriter.
+     *
+     * @param name the name of SparseTable.
+     * @param initialCapacity the initial capacity of SparseTable.
+     * @param blockSize the block size of the content table.
+     * @param baseDir the directory which contains the files of the content table.
+     * @param contentFilenames the file names of content files.
+     * @param contentIds the ids of contents. These ids are used for a suffix of a name of address
+     * files and content files.
+     */
+    public SparseTableContentWriter(final String name, final int initialCapacity,
+            final int blockSize, final File baseDir, final String[] contentFilenames,
+            final String[] contentIds) {
+        if (contentFilenames.length != contentIds.length) {
+            throw new RuntimeException("The length of contentFilenames and the length of"
+                    + " contentIds are different " + contentFilenames.length + ", "
+                    + contentIds.length);
+        }
+        mContentCount = contentFilenames.length;
+        mSparseTable = new SparseTable(initialCapacity, blockSize, mContentCount);
+        mLookupTableFile = new File(baseDir, name + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
+        mAddressTableFiles = new File[mContentCount];
+        mContentFiles = new File[mContentCount];
+        mBaseDir = baseDir;
+        for (int i = 0; i < mContentCount; ++i) {
+            mAddressTableFiles[i] = new File(mBaseDir,
+                    name + FormatSpec.CONTENT_TABLE_FILE_SUFFIX + contentIds[i]);
+            mContentFiles[i] = new File(mBaseDir, contentFilenames[i] + contentIds[i]);
+        }
+        mContentOutStreams = new OutputStream[mContentCount];
+    }
+
+    public void openStreams() throws FileNotFoundException {
+        for (int i = 0; i < mContentCount; ++i) {
+            mContentOutStreams[i] = new FileOutputStream(mContentFiles[i]);
+        }
+    }
+
+    protected void write(final int contentIndex, final int index,
+            final SparseTableContentWriterInterface writer) throws IOException {
+        mSparseTable.set(contentIndex, index, (int) mContentFiles[contentIndex].length());
+        writer.write(mContentOutStreams[contentIndex]);
+        mContentOutStreams[contentIndex].flush();
+    }
+
+    public void closeStreams() throws IOException {
+        mSparseTable.writeToFiles(mLookupTableFile, mAddressTableFiles);
+        for (int i = 0; i < mContentCount; ++i) {
+            mContentOutStreams[i].close();
+        }
+    }
+}
\ No newline at end of file
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver2DictDecoder.java
similarity index 94%
rename from java/src/com/android/inputmethod/latin/makedict/Ver3DictDecoder.java
rename to java/src/com/android/inputmethod/latin/makedict/Ver2DictDecoder.java
index acab4f8..ea0a2c6 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver2DictDecoder.java
@@ -23,7 +23,6 @@
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
-import com.android.inputmethod.latin.utils.JniUtils;
 
 import android.util.Log;
 
@@ -34,18 +33,11 @@
 import java.util.Arrays;
 
 /**
- * An implementation of DictDecoder for version 3 binary dictionary.
+ * An implementation of DictDecoder for version 2 binary dictionary.
  */
 @UsedForTesting
-public class Ver3DictDecoder extends AbstractDictDecoder {
-    private static final String TAG = Ver3DictDecoder.class.getSimpleName();
-
-    static {
-        JniUtils.loadNativeLibrary();
-    }
-
-    // TODO: implement something sensical instead of just a phony method
-    private static native int doNothing();
+public class Ver2DictDecoder extends AbstractDictDecoder {
+    private static final String TAG = Ver2DictDecoder.class.getSimpleName();
 
     protected static class PtNodeReader extends AbstractDictDecoder.PtNodeReader {
         private static int readFrequency(final DictBuffer dictBuffer) {
@@ -57,7 +49,7 @@
     private final DictionaryBufferFactory mBufferFactory;
     protected DictBuffer mDictBuffer;
 
-    /* package */ Ver3DictDecoder(final File file, final int factoryFlag) {
+    /* package */ Ver2DictDecoder(final File file, final int factoryFlag) {
         mDictionaryBinaryFile = file;
         mDictBuffer = null;
 
@@ -72,7 +64,7 @@
         }
     }
 
-    /* package */ Ver3DictDecoder(final File file, final DictionaryBufferFactory factory) {
+    /* package */ Ver2DictDecoder(final File file, final DictionaryBufferFactory factory) {
         mDictionaryBinaryFile = file;
         mBufferFactory = factory;
     }
@@ -166,7 +158,7 @@
         final ArrayList<PendingAttribute> bigrams;
         if (0 != (flags & FormatSpec.FLAG_HAS_BIGRAMS)) {
             bigrams = new ArrayList<PendingAttribute>();
-            addressPointer += PtNodeReader.readBigramAddresses(mDictBuffer, bigrams, 
+            addressPointer += PtNodeReader.readBigramAddresses(mDictBuffer, bigrams,
                     addressPointer);
             if (bigrams.size() >= FormatSpec.MAX_BIGRAMS_IN_A_PTNODE) {
                 throw new RuntimeException("Too many bigrams in a PtNode (" + bigrams.size()
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
similarity index 96%
rename from java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
rename to java/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
index 5da3453..e543042 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver2DictEncoder.java
@@ -31,16 +31,16 @@
 import java.util.Iterator;
 
 /**
- * An implementation of DictEncoder for version 3 binary dictionary.
+ * An implementation of DictEncoder for version 2 binary dictionary.
  */
-public class Ver3DictEncoder implements DictEncoder {
+public class Ver2DictEncoder implements DictEncoder {
 
     private final File mDictFile;
     private OutputStream mOutStream;
     private byte[] mBuffer;
     private int mPosition;
 
-    public Ver3DictEncoder(final File dictFile) {
+    public Ver2DictEncoder(final File dictFile) {
         mDictFile = dictFile;
         mOutStream = null;
         mBuffer = null;
@@ -49,7 +49,7 @@
     // This constructor is used only by BinaryDictOffdeviceUtilsTests.
     // If you want to use this in the production code, you should consider keeping consistency of
     // the interface of Ver3DictDecoder by using factory.
-    public Ver3DictEncoder(final OutputStream outStream) {
+    public Ver2DictEncoder(final OutputStream outStream) {
         mDictFile = null;
         mOutStream = outStream;
     }
@@ -68,7 +68,7 @@
     @Override
     public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
             throws IOException, UnsupportedFormatException {
-        if (formatOptions.mVersion > FormatSpec.VERSION3) {
+        if (formatOptions.mVersion > FormatSpec.VERSION2) {
             throw new UnsupportedFormatException(
                     "The given format options has wrong version number : "
                     + formatOptions.mVersion);
@@ -169,7 +169,7 @@
 
     private void writeChildrenPosition(final PtNode ptNode, final FormatOptions formatOptions) {
         final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        if (formatOptions.mSupportsDynamicUpdate) {
+        if (formatOptions.supportsDynamicUpdate()) {
             mPosition += BinaryDictEncoderUtils.writeSignedChildrenPosition(mBuffer, mPosition,
                     childrenPos);
         } else {
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictUpdater.java b/java/src/com/android/inputmethod/latin/makedict/Ver3DictUpdater.java
deleted file mode 100644
index 07adda6..0000000
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictUpdater.java
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.makedict;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
-
-import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.OutputStream;
-import java.util.ArrayList;
-
-/**
- * An implementation of DictUpdater for version 3 binary dictionary.
- */
-@UsedForTesting
-public class Ver3DictUpdater extends Ver3DictDecoder implements DictUpdater {
-    private OutputStream mOutStream;
-
-    @UsedForTesting
-    public Ver3DictUpdater(final File dictFile, final int factoryType) {
-        // DictUpdater must have an updatable DictBuffer.
-        super(dictFile, ((factoryType & MASK_DICTBUFFER) == USE_BYTEARRAY)
-                ? USE_BYTEARRAY : USE_WRITABLE_BYTEBUFFER);
-        mOutStream = null;
-    }
-
-    private void openStreamAndBuffer() throws FileNotFoundException, IOException {
-        super.openDictBuffer();
-        mOutStream = new FileOutputStream(mDictionaryBinaryFile, true /* append */);
-    }
-
-    private void close() throws IOException {
-        if (mOutStream != null) {
-            mOutStream.close();
-            mOutStream = null;
-        }
-    }
-
-    @Override @UsedForTesting
-    public void deleteWord(final String word) throws IOException, UnsupportedFormatException {
-        if (mOutStream == null) openStreamAndBuffer();
-        mDictBuffer.position(0);
-        readHeader();
-        final int wordPos = getTerminalPosition(word);
-        if (wordPos != FormatSpec.NOT_VALID_WORD) {
-            mDictBuffer.position(wordPos);
-            final int flags = mDictBuffer.readUnsignedByte();
-            mDictBuffer.position(wordPos);
-            mDictBuffer.put((byte) DynamicBinaryDictIOUtils.markAsDeleted(flags));
-        }
-        close();
-    }
-
-    @Override @UsedForTesting
-    public void insertWord(final String word, final int frequency,
-            final ArrayList<WeightedString> bigramStrings,
-            final ArrayList<WeightedString> shortcuts,
-            final boolean isNotAWord, final boolean isBlackListEntry)
-                    throws IOException, UnsupportedFormatException {
-        if (mOutStream == null) openStreamAndBuffer();
-        DynamicBinaryDictIOUtils.insertWord(this, mOutStream, word, frequency, bigramStrings,
-                shortcuts, isNotAWord, isBlackListEntry);
-        close();
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
index 734223e..7071893 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictDecoder.java
@@ -40,26 +40,52 @@
 public class Ver4DictDecoder extends AbstractDictDecoder {
     private static final String TAG = Ver4DictDecoder.class.getSimpleName();
 
-    private static final int FILETYPE_TRIE = 1;
-    private static final int FILETYPE_FREQUENCY = 2;
-    private static final int FILETYPE_TERMINAL_ADDRESS_TABLE = 3;
-    private static final int FILETYPE_BIGRAM_FREQ = 4;
-    private static final int FILETYPE_SHORTCUT = 5;
+    protected static final int FILETYPE_TRIE = 1;
+    protected static final int FILETYPE_FREQUENCY = 2;
+    protected static final int FILETYPE_TERMINAL_ADDRESS_TABLE = 3;
+    protected static final int FILETYPE_BIGRAM_FREQ = 4;
+    protected static final int FILETYPE_SHORTCUT = 5;
+    protected static final int FILETYPE_HEADER = 6;
 
-    private final File mDictDirectory;
-    private final DictionaryBufferFactory mBufferFactory;
+    protected final File mDictDirectory;
+    protected final DictionaryBufferFactory mBufferFactory;
     protected DictBuffer mDictBuffer;
-    private DictBuffer mFrequencyBuffer;
-    private DictBuffer mTerminalAddressTableBuffer;
-    private DictBuffer mBigramBuffer;
-    private DictBuffer mShortcutBuffer;
-    private SparseTable mBigramAddressTable;
-    private SparseTable mShortcutAddressTable;
+    protected DictBuffer mHeaderBuffer;
+    protected DictBuffer mFrequencyBuffer;
+    protected DictBuffer mTerminalAddressTableBuffer;
+    private BigramContentReader mBigramReader;
+    private ShortcutContentReader mShortcutReader;
+
+    /**
+     * Raw PtNode info straight out of a trie file in version 4 dictionary.
+     */
+    protected static final class Ver4PtNodeInfo {
+        public final int mFlags;
+        public final int[] mCharacters;
+        public final int mTerminalId;
+        public final int mChildrenPos;
+        public final int mParentPos;
+        public final int mNodeSize;
+        public int mStartIndexOfCharacters;
+        public int mEndIndexOfCharacters; // exclusive
+
+        public Ver4PtNodeInfo(final int flags, final int[] characters, final int terminalId,
+                final int childrenPos, final int parentPos, final int nodeSize) {
+            mFlags = flags;
+            mCharacters = characters;
+            mTerminalId = terminalId;
+            mChildrenPos = childrenPos;
+            mParentPos = parentPos;
+            mNodeSize = nodeSize;
+            mStartIndexOfCharacters = 0;
+            mEndIndexOfCharacters = characters.length;
+        }
+    }
 
     @UsedForTesting
     /* package */ Ver4DictDecoder(final File dictDirectory, final int factoryFlag) {
         mDictDirectory = dictDirectory;
-        mDictBuffer = mFrequencyBuffer = null;
+        mDictBuffer = mHeaderBuffer = mFrequencyBuffer = null;
 
         if ((factoryFlag & MASK_DICTBUFFER) == USE_READONLY_BYTEBUFFER) {
             mBufferFactory = new DictionaryBufferFromReadOnlyByteBufferFactory();
@@ -76,13 +102,16 @@
     /* package */ Ver4DictDecoder(final File dictDirectory, final DictionaryBufferFactory factory) {
         mDictDirectory = dictDirectory;
         mBufferFactory = factory;
-        mDictBuffer = mFrequencyBuffer = null;
+        mDictBuffer = mHeaderBuffer = mFrequencyBuffer = null;
     }
 
-    private File getFile(final int fileType) {
+    protected File getFile(final int fileType) throws UnsupportedFormatException {
         if (fileType == FILETYPE_TRIE) {
             return new File(mDictDirectory,
                     mDictDirectory.getName() + FormatSpec.TRIE_FILE_EXTENSION);
+        } else if (fileType == FILETYPE_HEADER) {
+            return new File(mDictDirectory,
+                    mDictDirectory.getName() + FormatSpec.HEADER_FILE_EXTENSION);
         } else if (fileType == FILETYPE_FREQUENCY) {
             return new File(mDictDirectory,
                     mDictDirectory.getName() + FormatSpec.FREQ_FILE_EXTENSION);
@@ -98,20 +127,27 @@
                     mDictDirectory.getName() + FormatSpec.SHORTCUT_FILE_EXTENSION
                             + FormatSpec.SHORTCUT_CONTENT_ID);
         } else {
-            throw new RuntimeException("Unsupported kind of file : " + fileType);
+            throw new UnsupportedFormatException("Unsupported kind of file : " + fileType);
         }
     }
 
     @Override
-    public void openDictBuffer() throws FileNotFoundException, IOException {
+    public void openDictBuffer() throws FileNotFoundException, IOException,
+            UnsupportedFormatException {
+        if (!mDictDirectory.isDirectory()) {
+            throw new UnsupportedFormatException("Format 4 dictionary needs a directory");
+        }
+        mHeaderBuffer = mBufferFactory.getDictionaryBuffer(getFile(FILETYPE_HEADER));
         mDictBuffer = mBufferFactory.getDictionaryBuffer(getFile(FILETYPE_TRIE));
         mFrequencyBuffer = mBufferFactory.getDictionaryBuffer(getFile(FILETYPE_FREQUENCY));
         mTerminalAddressTableBuffer = mBufferFactory.getDictionaryBuffer(
                 getFile(FILETYPE_TERMINAL_ADDRESS_TABLE));
-        mBigramBuffer = mBufferFactory.getDictionaryBuffer(getFile(FILETYPE_BIGRAM_FREQ));
-        loadBigramAddressSparseTable();
-        mShortcutBuffer = mBufferFactory.getDictionaryBuffer(getFile(FILETYPE_SHORTCUT));
-        loadShortcutAddressSparseTable();
+        mBigramReader = new BigramContentReader(mDictDirectory.getName(),
+                mDictDirectory, mBufferFactory, false);
+        mBigramReader.openBuffers();
+        mShortcutReader = new ShortcutContentReader(mDictDirectory.getName(), mDictDirectory,
+                mBufferFactory);
+        mShortcutReader.openBuffers();
     }
 
     @Override
@@ -119,46 +155,134 @@
         return mDictBuffer != null;
     }
 
+    @UsedForTesting
+    /* package */ DictBuffer getHeaderBuffer() {
+        return mHeaderBuffer;
+    }
+
+    @UsedForTesting
     /* package */ DictBuffer getDictBuffer() {
         return mDictBuffer;
     }
 
     @Override
     public FileHeader readHeader() throws IOException, UnsupportedFormatException {
-        if (mDictBuffer == null) {
+        if (mHeaderBuffer == null) {
             openDictBuffer();
         }
-        final FileHeader header = super.readHeader(mDictBuffer);
+        mHeaderBuffer.position(0);
+        final FileHeader header = super.readHeader(mHeaderBuffer);
         final int version = header.mFormatOptions.mVersion;
-        if (version != 4) {
+        if (version != FormatSpec.VERSION4) {
             throw new UnsupportedFormatException("File header has a wrong version : " + version);
         }
         return header;
     }
 
-    private void loadBigramAddressSparseTable() throws IOException {
-        final File lookupIndexFile = new File(mDictDirectory, mDictDirectory.getName()
-                + FormatSpec.BIGRAM_FILE_EXTENSION + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
-        final File freqsFile = new File(mDictDirectory, mDictDirectory.getName()
-                + FormatSpec.BIGRAM_FILE_EXTENSION + FormatSpec.CONTENT_TABLE_FILE_SUFFIX
-                + FormatSpec.BIGRAM_FREQ_CONTENT_ID);
-        mBigramAddressTable = SparseTable.readFromFiles(lookupIndexFile, new File[] { freqsFile },
-                FormatSpec.BIGRAM_ADDRESS_TABLE_BLOCK_SIZE);
+    /**
+     * An auxiliary class for reading bigrams.
+     */
+    protected static class BigramContentReader extends SparseTableContentReader {
+        public BigramContentReader(final String name, final File baseDir,
+                final DictionaryBufferFactory factory, final boolean hasTimestamp) {
+            super(name + FormatSpec.BIGRAM_FILE_EXTENSION,
+                    FormatSpec.BIGRAM_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
+                    getContentFilenames(name, hasTimestamp), getContentIds(hasTimestamp), factory);
+        }
+
+        // TODO: Consolidate this method and BigramContentWriter.getContentFilenames.
+        protected static String[] getContentFilenames(final String name,
+                final boolean hasTimestamp) {
+            final String[] contentFilenames;
+            if (hasTimestamp) {
+                contentFilenames = new String[] { name + FormatSpec.BIGRAM_FILE_EXTENSION,
+                        name + FormatSpec.BIGRAM_FILE_EXTENSION };
+            } else {
+                contentFilenames = new String[] { name + FormatSpec.BIGRAM_FILE_EXTENSION };
+            }
+            return contentFilenames;
+        }
+
+        // TODO: Consolidate this method and BigramContentWriter.getContentIds.
+        protected static String[] getContentIds(final boolean hasTimestamp) {
+            final String[] contentIds;
+            if (hasTimestamp) {
+                contentIds = new String[] { FormatSpec.BIGRAM_FREQ_CONTENT_ID,
+                        FormatSpec.BIGRAM_TIMESTAMP_CONTENT_ID };
+            } else {
+                contentIds = new String[] { FormatSpec.BIGRAM_FREQ_CONTENT_ID };
+            }
+            return contentIds;
+        }
+
+        public ArrayList<PendingAttribute> readTargetsAndFrequencies(final int terminalId,
+                final DictBuffer terminalAddressTableBuffer) {
+            final ArrayList<PendingAttribute> bigrams = CollectionUtils.newArrayList();
+            read(FormatSpec.BIGRAM_FREQ_CONTENT_INDEX, terminalId,
+                    new SparseTableContentReaderInterface() {
+                        @Override
+                        public void read(final DictBuffer buffer) {
+                            while (bigrams.size() < FormatSpec.MAX_BIGRAMS_IN_A_PTNODE) {
+                                // If bigrams.size() reaches FormatSpec.MAX_BIGRAMS_IN_A_PTNODE,
+                                // remaining bigram entries are ignored.
+                                final int bigramFlags = buffer.readUnsignedByte();
+                                final int targetTerminalId = buffer.readUnsignedInt24();
+                                terminalAddressTableBuffer.position(targetTerminalId
+                                        * FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE);
+                                final int targetAddress =
+                                        terminalAddressTableBuffer.readUnsignedInt24();
+                                bigrams.add(new PendingAttribute(bigramFlags
+                                        & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY,
+                                        targetAddress));
+                                if (0 == (bigramFlags
+                                        & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_HAS_NEXT)) {
+                                    break;
+                                }
+                            }
+                            if (bigrams.size() >= FormatSpec.MAX_BIGRAMS_IN_A_PTNODE) {
+                                throw new RuntimeException("Too many bigrams in a PtNode ("
+                                        + bigrams.size() + " but max is "
+                                        + FormatSpec.MAX_BIGRAMS_IN_A_PTNODE + ")");
+                            }
+                        }
+                    });
+            if (bigrams.isEmpty()) return null;
+            return bigrams;
+        }
     }
 
-    // TODO: Let's have something like SparseTableContentsReader in this class.
-    private void loadShortcutAddressSparseTable() throws IOException {
-        final File lookupIndexFile = new File(mDictDirectory, mDictDirectory.getName()
-                + FormatSpec.SHORTCUT_FILE_EXTENSION + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
-        final File contentFile = new File(mDictDirectory, mDictDirectory.getName()
-                + FormatSpec.SHORTCUT_FILE_EXTENSION + FormatSpec.CONTENT_TABLE_FILE_SUFFIX
-                + FormatSpec.SHORTCUT_CONTENT_ID);
-        final File timestampsFile = new File(mDictDirectory, mDictDirectory.getName()
-                + FormatSpec.SHORTCUT_FILE_EXTENSION + FormatSpec.CONTENT_TABLE_FILE_SUFFIX
-                + FormatSpec.SHORTCUT_CONTENT_ID);
-        mShortcutAddressTable = SparseTable.readFromFiles(lookupIndexFile,
-                new File[] { contentFile, timestampsFile },
-                FormatSpec.SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE);
+    /**
+     * An auxiliary class for reading shortcuts.
+     */
+    protected static class ShortcutContentReader extends SparseTableContentReader {
+        public ShortcutContentReader(final String name, final File baseDir,
+                final DictionaryBufferFactory factory) {
+            super(name + FormatSpec.SHORTCUT_FILE_EXTENSION,
+                    FormatSpec.SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
+                    new String[] { name + FormatSpec.SHORTCUT_FILE_EXTENSION },
+                    new String[] { FormatSpec.SHORTCUT_CONTENT_ID }, factory);
+        }
+
+        public ArrayList<WeightedString> readShortcuts(final int terminalId) {
+            final ArrayList<WeightedString> shortcuts = CollectionUtils.newArrayList();
+            read(FormatSpec.SHORTCUT_CONTENT_INDEX, terminalId,
+                    new SparseTableContentReaderInterface() {
+                        @Override
+                        public void read(final DictBuffer buffer) {
+                            while (true) {
+                                final int flags = buffer.readUnsignedByte();
+                                final String word = CharEncoding.readString(buffer);
+                                shortcuts.add(new WeightedString(word,
+                                        flags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY));
+                                if (0 == (flags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_HAS_NEXT)) {
+                                    break;
+                                }
+                            }
+                        }
+                    });
+            if (shortcuts.isEmpty()) return null;
+            return shortcuts;
+        }
     }
 
     protected static class PtNodeReader extends AbstractDictDecoder.PtNodeReader {
@@ -172,102 +296,82 @@
         }
     }
 
-    private ArrayList<WeightedString> readShortcuts(final int terminalId) {
-        if (mShortcutAddressTable.get(0, terminalId) == SparseTable.NOT_EXIST) return null;
+    private final int[] mCharacterBufferForReadingVer4PtNodeInfo
+            = new int[FormatSpec.MAX_WORD_LENGTH];
 
-        final ArrayList<WeightedString> ret = CollectionUtils.newArrayList();
-        final int posOfShortcuts = mShortcutAddressTable.get(FormatSpec.SHORTCUT_CONTENT_INDEX,
-                terminalId);
-        mShortcutBuffer.position(posOfShortcuts);
-        while (true) {
-            final int flags = mShortcutBuffer.readUnsignedByte();
-            final String word = CharEncoding.readString(mShortcutBuffer);
-            ret.add(new WeightedString(word,
-                    flags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY));
-            if (0 == (flags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_HAS_NEXT)) break;
-        }
-        return ret;
-    }
-
+    /**
+     * Reads PtNode from ptNodePos in the trie file and returns Ver4PtNodeInfo.
+     *
+     * @param ptNodePos the position of PtNode.
+     * @param options the format options.
+     * @return Ver4PtNodeInfo.
+     */
     // TODO: Make this buffer thread safe.
     // TODO: Support words longer than FormatSpec.MAX_WORD_LENGTH.
-    private final int[] mCharacterBuffer = new int[FormatSpec.MAX_WORD_LENGTH];
-    @Override
-    public PtNodeInfo readPtNode(int ptNodePos, FormatOptions options) {
-        int addressPointer = ptNodePos;
+    protected Ver4PtNodeInfo readVer4PtNodeInfo(final int ptNodePos, final FormatOptions options) {
+        int readingPos = ptNodePos;
         final int flags = PtNodeReader.readPtNodeOptionFlags(mDictBuffer);
-        addressPointer += FormatSpec.PTNODE_FLAGS_SIZE;
+        readingPos += FormatSpec.PTNODE_FLAGS_SIZE;
 
-        final int parentAddress = PtNodeReader.readParentAddress(mDictBuffer, options);
+        final int parentPos = PtNodeReader.readParentAddress(mDictBuffer, options);
         if (BinaryDictIOUtils.supportsDynamicUpdate(options)) {
-            addressPointer += FormatSpec.PARENT_ADDRESS_SIZE;
+            readingPos += FormatSpec.PARENT_ADDRESS_SIZE;
         }
 
         final int characters[];
         if (0 != (flags & FormatSpec.FLAG_HAS_MULTIPLE_CHARS)) {
             int index = 0;
             int character = CharEncoding.readChar(mDictBuffer);
-            addressPointer += CharEncoding.getCharSize(character);
+            readingPos += CharEncoding.getCharSize(character);
             while (FormatSpec.INVALID_CHARACTER != character
                     && index < FormatSpec.MAX_WORD_LENGTH) {
-                mCharacterBuffer[index++] = character;
+                mCharacterBufferForReadingVer4PtNodeInfo[index++] = character;
                 character = CharEncoding.readChar(mDictBuffer);
-                addressPointer += CharEncoding.getCharSize(character);
+                readingPos += CharEncoding.getCharSize(character);
             }
-            characters = Arrays.copyOfRange(mCharacterBuffer, 0, index);
+            characters = Arrays.copyOfRange(mCharacterBufferForReadingVer4PtNodeInfo, 0, index);
         } else {
             final int character = CharEncoding.readChar(mDictBuffer);
-            addressPointer += CharEncoding.getCharSize(character);
+            readingPos += CharEncoding.getCharSize(character);
             characters = new int[] { character };
         }
         final int terminalId;
         if (0 != (FormatSpec.FLAG_IS_TERMINAL & flags)) {
             terminalId = PtNodeReader.readTerminalId(mDictBuffer);
-            addressPointer += FormatSpec.PTNODE_TERMINAL_ID_SIZE;
+            readingPos += FormatSpec.PTNODE_TERMINAL_ID_SIZE;
         } else {
             terminalId = PtNode.NOT_A_TERMINAL;
         }
 
+        int childrenPos = PtNodeReader.readChildrenAddress(mDictBuffer, flags, options);
+        if (childrenPos != FormatSpec.NO_CHILDREN_ADDRESS) {
+            childrenPos += readingPos;
+        }
+        readingPos += BinaryDictIOUtils.getChildrenAddressSize(flags, options);
+
+        return new Ver4PtNodeInfo(flags, characters, terminalId, childrenPos, parentPos,
+                readingPos - ptNodePos);
+    }
+
+    @Override
+    public PtNodeInfo readPtNode(int ptNodePos, FormatOptions options) {
+        final Ver4PtNodeInfo nodeInfo = readVer4PtNodeInfo(ptNodePos, options);
+
         final int frequency;
-        if (0 != (FormatSpec.FLAG_IS_TERMINAL & flags)) {
-            frequency = PtNodeReader.readFrequency(mFrequencyBuffer, terminalId);
+        if (0 != (FormatSpec.FLAG_IS_TERMINAL & nodeInfo.mFlags)) {
+            frequency = PtNodeReader.readFrequency(mFrequencyBuffer, nodeInfo.mTerminalId);
         } else {
             frequency = PtNode.NOT_A_TERMINAL;
         }
-        int childrenAddress = PtNodeReader.readChildrenAddress(mDictBuffer, flags, options);
-        if (childrenAddress != FormatSpec.NO_CHILDREN_ADDRESS) {
-            childrenAddress += addressPointer;
-        }
-        addressPointer += BinaryDictIOUtils.getChildrenAddressSize(flags, options);
-        final ArrayList<WeightedString> shortcutTargets = readShortcuts(terminalId);
 
-        final ArrayList<PendingAttribute> bigrams;
-        if (0 != (flags & FormatSpec.FLAG_HAS_BIGRAMS)) {
-            bigrams = new ArrayList<PendingAttribute>();
-            final int posOfBigrams = mBigramAddressTable.get(0 /* contentTableIndex */, terminalId);
-            mBigramBuffer.position(posOfBigrams);
-            while (bigrams.size() < FormatSpec.MAX_BIGRAMS_IN_A_PTNODE) {
-                // If bigrams.size() reaches FormatSpec.MAX_BIGRAMS_IN_A_PTNODE,
-                // remaining bigram entries are ignored.
-                final int bigramFlags = mBigramBuffer.readUnsignedByte();
-                final int targetTerminalId = mBigramBuffer.readUnsignedInt24();
-                mTerminalAddressTableBuffer.position(
-                        targetTerminalId * FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE);
-                final int targetAddress = mTerminalAddressTableBuffer.readUnsignedInt24();
-                bigrams.add(new PendingAttribute(
-                        bigramFlags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_FREQUENCY,
-                        targetAddress));
-                if (0 == (bigramFlags & FormatSpec.FLAG_BIGRAM_SHORTCUT_ATTR_HAS_NEXT)) break;
-            }
-            if (bigrams.size() >= FormatSpec.MAX_BIGRAMS_IN_A_PTNODE) {
-                throw new RuntimeException("Too many bigrams in a PtNode (" + bigrams.size()
-                        + " but max is " + FormatSpec.MAX_BIGRAMS_IN_A_PTNODE + ")");
-            }
-        } else {
-            bigrams = null;
-        }
-        return new PtNodeInfo(ptNodePos, addressPointer, flags, characters, frequency,
-                parentAddress, childrenAddress, shortcutTargets, bigrams);
+        final ArrayList<WeightedString> shortcutTargets = mShortcutReader.readShortcuts(
+                nodeInfo.mTerminalId);
+        final ArrayList<PendingAttribute> bigrams = mBigramReader.readTargetsAndFrequencies(
+                nodeInfo.mTerminalId, mTerminalAddressTableBuffer);
+
+        return new PtNodeInfo(ptNodePos, ptNodePos + nodeInfo.mNodeSize, nodeInfo.mFlags,
+                nodeInfo.mCharacters, frequency, nodeInfo.mParentPos, nodeInfo.mChildrenPos,
+                shortcutTargets, bigrams);
     }
 
     private void deleteDictFiles() {
@@ -318,10 +422,14 @@
 
     @Override
     public boolean readAndFollowForwardLink() {
-        final int nextAddress = mDictBuffer.readUnsignedInt24();
-        if (nextAddress >= 0 && nextAddress < mDictBuffer.limit()) {
-            mDictBuffer.position(nextAddress);
-            return true;
+        final int forwardLinkPos = mDictBuffer.position();
+        int nextRelativePos = BinaryDictDecoderUtils.readSInt24(mDictBuffer);
+        if (nextRelativePos != FormatSpec.NO_FORWARD_LINK_ADDRESS) {
+            final int nextPos = forwardLinkPos + nextRelativePos;
+            if (nextPos >= 0 && nextPos < mDictBuffer.limit()) {
+              mDictBuffer.position(nextPos);
+              return true;
+            }
         }
         return false;
     }
@@ -332,6 +440,7 @@
     }
 
     @Override
+    @UsedForTesting
     public void skipPtNode(final FormatOptions formatOptions) {
         final int flags = PtNodeReader.readPtNodeOptionFlags(mDictBuffer);
         PtNodeReader.readParentAddress(mDictBuffer, formatOptions);
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
index 8d5b48a..d34aa17 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
@@ -1,5 +1,4 @@
 /*
-/*
  * Copyright (C) 2013 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -18,21 +17,15 @@
 package com.android.inputmethod.latin.makedict;
 
 import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
-import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
+import com.android.inputmethod.latin.BinaryDictionary;
+import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
-import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
-import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
+import com.android.inputmethod.latin.utils.LocaleUtils;
 
 import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.OutputStream;
-import java.util.ArrayList;
-import java.util.Iterator;
 
 /**
  * An implementation of DictEncoder for version 4 binary dictionary.
@@ -40,244 +33,19 @@
 @UsedForTesting
 public class Ver4DictEncoder implements DictEncoder {
     private final File mDictPlacedDir;
-    private byte[] mTrieBuf;
-    private int mTriePos;
-    private int mHeaderSize;
-    private OutputStream mTrieOutStream;
-    private OutputStream mFreqOutStream;
-    private OutputStream mUnigramTimestampOutStream;
-    private OutputStream mTerminalAddressTableOutStream;
-    private File mDictDir;
-    private String mBaseFilename;
-    private BigramContentWriter mBigramWriter;
-    private ShortcutContentWriter mShortcutWriter;
 
     @UsedForTesting
     public Ver4DictEncoder(final File dictPlacedDir) {
         mDictPlacedDir = dictPlacedDir;
     }
 
-    private interface SparseTableContentWriterInterface {
-        public void write(final OutputStream outStream) throws IOException;
-    }
-
-    private static class SparseTableContentWriter {
-        private final int mContentCount;
-        private final SparseTable mSparseTable;
-        private final File mLookupTableFile;
-        protected final File mBaseDir;
-        private final File[] mAddressTableFiles;
-        private final File[] mContentFiles;
-        protected final OutputStream[] mContentOutStreams;
-
-        public SparseTableContentWriter(final String name, final int initialCapacity,
-                final int blockSize, final File baseDir, final String[] contentFilenames,
-                final String[] contentIds) {
-            if (contentFilenames.length != contentIds.length) {
-                throw new RuntimeException("The length of contentFilenames and the length of"
-                        + " contentIds are different " + contentFilenames.length + ", "
-                        + contentIds.length);
-            }
-            mContentCount = contentFilenames.length;
-            mSparseTable = new SparseTable(initialCapacity, blockSize, mContentCount);
-            mLookupTableFile = new File(baseDir, name + FormatSpec.LOOKUP_TABLE_FILE_SUFFIX);
-            mAddressTableFiles = new File[mContentCount];
-            mContentFiles = new File[mContentCount];
-            mBaseDir = baseDir;
-            for (int i = 0; i < mContentCount; ++i) {
-                mAddressTableFiles[i] = new File(mBaseDir,
-                        name + FormatSpec.CONTENT_TABLE_FILE_SUFFIX + contentIds[i]);
-                mContentFiles[i] = new File(mBaseDir, contentFilenames[i] + contentIds[i]);
-            }
-            mContentOutStreams = new OutputStream[mContentCount];
-        }
-
-        public void openStreams() throws FileNotFoundException {
-            for (int i = 0; i < mContentCount; ++i) {
-                mContentOutStreams[i] = new FileOutputStream(mContentFiles[i]);
-            }
-        }
-
-        protected void write(final int contentIndex, final int index,
-                final SparseTableContentWriterInterface writer) throws IOException {
-            mSparseTable.set(contentIndex, index, (int) mContentFiles[contentIndex].length());
-            writer.write(mContentOutStreams[contentIndex]);
-            mContentOutStreams[contentIndex].flush();
-        }
-
-        public void closeStreams() throws IOException {
-            mSparseTable.writeToFiles(mLookupTableFile, mAddressTableFiles);
-            for (int i = 0; i < mContentCount; ++i) {
-                mContentOutStreams[i].close();
-            }
-        }
-    }
-
-    private static class BigramContentWriter extends SparseTableContentWriter {
-        private final boolean mWriteTimestamp;
-
-        public BigramContentWriter(final String name, final int initialCapacity,
-                final File baseDir, final boolean writeTimestamp) {
-            super(name + FormatSpec.BIGRAM_FILE_EXTENSION, initialCapacity,
-                    FormatSpec.BIGRAM_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
-                    getContentFilenames(name, writeTimestamp), getContentIds(writeTimestamp));
-            mWriteTimestamp = writeTimestamp;
-        }
-
-        private static String[] getContentFilenames(final String name,
-                final boolean writeTimestamp) {
-            final String[] contentFilenames;
-            if (writeTimestamp) {
-                contentFilenames = new String[] { name + FormatSpec.BIGRAM_FILE_EXTENSION,
-                        name + FormatSpec.BIGRAM_FILE_EXTENSION };
-            } else {
-                contentFilenames = new String[] { name + FormatSpec.BIGRAM_FILE_EXTENSION };
-            }
-            return contentFilenames;
-        }
-
-        private static String[] getContentIds(final boolean writeTimestamp) {
-            final String[] contentIds;
-            if (writeTimestamp) {
-                contentIds = new String[] { FormatSpec.BIGRAM_FREQ_CONTENT_ID,
-                        FormatSpec.BIGRAM_TIMESTAMP_CONTENT_ID };
-            } else {
-                contentIds = new String[] { FormatSpec.BIGRAM_FREQ_CONTENT_ID };
-            }
-            return contentIds;
-        }
-
-        public void writeBigramsForOneWord(final int terminalId, final int bigramCount,
-                final Iterator<WeightedString> bigramIterator, final FusionDictionary dict)
-                        throws IOException {
-            write(FormatSpec.BIGRAM_FREQ_CONTENT_INDEX, terminalId,
-                    new SparseTableContentWriterInterface() {
-                        @Override
-                        public void write(final OutputStream outStream) throws IOException {
-                            writeBigramsForOneWordInternal(outStream, bigramIterator, dict);
-                        }});
-            if (mWriteTimestamp) {
-                write(FormatSpec.BIGRAM_TIMESTAMP_CONTENT_INDEX, terminalId,
-                        new SparseTableContentWriterInterface() {
-                            @Override
-                            public void write(final OutputStream outStream) throws IOException {
-                                initBigramTimestampsCountersAndLevelsForOneWordInternal(outStream,
-                                        bigramCount);
-                            }});
-            }
-        }
-
-        private void writeBigramsForOneWordInternal(final OutputStream outStream,
-                final Iterator<WeightedString> bigramIterator, final FusionDictionary dict)
-                        throws IOException {
-            while (bigramIterator.hasNext()) {
-                final WeightedString bigram = bigramIterator.next();
-                final PtNode target =
-                        FusionDictionary.findWordInTree(dict.mRootNodeArray, bigram.mWord);
-                final int unigramFrequencyForThisWord = target.mFrequency;
-                final int bigramFlags = BinaryDictEncoderUtils.makeBigramFlags(
-                        bigramIterator.hasNext(), 0, bigram.mFrequency,
-                        unigramFrequencyForThisWord, bigram.mWord);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, bigramFlags,
-                        FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, target.mTerminalId,
-                        FormatSpec.PTNODE_ATTRIBUTE_MAX_ADDRESS_SIZE);
-            }
-        }
-
-        private void initBigramTimestampsCountersAndLevelsForOneWordInternal(
-                final OutputStream outStream, final int bigramCount) throws IOException {
-            for (int i = 0; i < bigramCount; ++i) {
-                // TODO: Figure out what initial values should be.
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, 0 /* value */,
-                        FormatSpec.BIGRAM_TIMESTAMP_SIZE);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, 0 /* value */,
-                        FormatSpec.BIGRAM_COUNTER_SIZE);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, 0 /* value */,
-                        FormatSpec.BIGRAM_LEVEL_SIZE);
-            }
-        }
-    }
-
-    private static class ShortcutContentWriter extends SparseTableContentWriter {
-        public ShortcutContentWriter(final String name, final int initialCapacity,
-                final File baseDir) {
-            super(name + FormatSpec.SHORTCUT_FILE_EXTENSION, initialCapacity,
-                    FormatSpec.SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE, baseDir,
-                    new String[] { name + FormatSpec.SHORTCUT_FILE_EXTENSION },
-                    new String[] { FormatSpec.SHORTCUT_CONTENT_ID });
-        }
-
-        public void writeShortcutForOneWord(final int terminalId,
-                final Iterator<WeightedString> shortcutIterator) throws IOException {
-            write(FormatSpec.SHORTCUT_CONTENT_INDEX, terminalId,
-                    new SparseTableContentWriterInterface() {
-                        @Override
-                        public void write(final OutputStream outStream) throws IOException {
-                            writeShortcutForOneWordInternal(outStream, shortcutIterator);
-                        }
-                    });
-        }
-
-        private void writeShortcutForOneWordInternal(final OutputStream outStream,
-                final Iterator<WeightedString> shortcutIterator) throws IOException {
-            while (shortcutIterator.hasNext()) {
-                final WeightedString target = shortcutIterator.next();
-                final int shortcutFlags = BinaryDictEncoderUtils.makeShortcutFlags(
-                        shortcutIterator.hasNext(), target.mFrequency);
-                BinaryDictEncoderUtils.writeUIntToStream(outStream, shortcutFlags,
-                        FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
-                CharEncoding.writeString(outStream, target.mWord);
-            }
-        }
-    }
-
-    private void openStreams(final FormatOptions formatOptions, final DictionaryOptions dictOptions)
-            throws FileNotFoundException, IOException {
-        final FileHeader header = new FileHeader(0, dictOptions, formatOptions);
-        mBaseFilename = header.getId() + "." + header.getVersion();
-        mDictDir = new File(mDictPlacedDir, mBaseFilename);
-        final File trieFile = new File(mDictDir, mBaseFilename + FormatSpec.TRIE_FILE_EXTENSION);
-        final File freqFile = new File(mDictDir, mBaseFilename + FormatSpec.FREQ_FILE_EXTENSION);
-        final File timestampFile = new File(mDictDir,
-                mBaseFilename + FormatSpec.UNIGRAM_TIMESTAMP_FILE_EXTENSION);
-        final File terminalAddressTableFile = new File(mDictDir,
-                mBaseFilename + FormatSpec.TERMINAL_ADDRESS_TABLE_FILE_EXTENSION);
-        if (!mDictDir.isDirectory()) {
-            if (mDictDir.exists()) mDictDir.delete();
-            mDictDir.mkdirs();
-        }
-        mTrieOutStream = new FileOutputStream(trieFile);
-        mFreqOutStream = new FileOutputStream(freqFile);
-        mTerminalAddressTableOutStream = new FileOutputStream(terminalAddressTableFile);
-        if (formatOptions.mHasTimestamp) {
-            mUnigramTimestampOutStream = new FileOutputStream(timestampFile);
-        }
-    }
-
-    private void close() throws IOException {
-        try {
-            if (mTrieOutStream != null) {
-                mTrieOutStream.close();
-            }
-            if (mFreqOutStream != null) {
-                mFreqOutStream.close();
-            }
-            if (mTerminalAddressTableOutStream != null) {
-                mTerminalAddressTableOutStream.close();
-            }
-            if (mUnigramTimestampOutStream != null) {
-                mUnigramTimestampOutStream.close();
-            }
-        } finally {
-            mTrieOutStream = null;
-            mFreqOutStream = null;
-            mTerminalAddressTableOutStream = null;
-        }
-    }
-
+    // TODO: This builds a FusionDictionary first and iterates it to add words to the binary
+    // dictionary. However, it is possible to just add words directly to the binary dictionary
+    // instead.
+    // In the long run, when we stop supporting version 2, FusionDictionary will become deprecated
+    // and we can remove it. Then we'll be able to just call BinaryDictionary directly.
     @Override
-    public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
+    public void writeDictionary(FusionDictionary dict, FormatOptions formatOptions)
             throws IOException, UnsupportedFormatException {
         if (formatOptions.mVersion != FormatSpec.VERSION4) {
             throw new UnsupportedFormatException("File header has a wrong version number : "
@@ -286,190 +54,71 @@
         if (!mDictPlacedDir.isDirectory()) {
             throw new UnsupportedFormatException("Given path is not a directory.");
         }
-
-        if (mTrieOutStream == null) {
-            openStreams(formatOptions, dict.mOptions);
+        if (!BinaryDictionary.createEmptyDictFile(mDictPlacedDir.getAbsolutePath(),
+                FormatSpec.VERSION4, dict.mOptions.mAttributes)) {
+            throw new IOException("Cannot create dictionary file : "
+                + mDictPlacedDir.getAbsolutePath());
         }
-
-        mHeaderSize = BinaryDictEncoderUtils.writeDictionaryHeader(mTrieOutStream, dict,
-                formatOptions);
-
-        MakedictLog.i("Flattening the tree...");
-        ArrayList<PtNodeArray> flatNodes = BinaryDictEncoderUtils.flattenTree(dict.mRootNodeArray);
-        int terminalCount = 0;
-        for (final PtNodeArray array : flatNodes) {
-            for (final PtNode node : array.mData) {
-                if (node.isTerminal()) node.mTerminalId = terminalCount++;
+        final BinaryDictionary binaryDict = new BinaryDictionary(mDictPlacedDir.getAbsolutePath(),
+                0l, mDictPlacedDir.length(), true /* useFullEditDistance */,
+                LocaleUtils.constructLocaleFromString(dict.mOptions.mAttributes.get(
+                        FormatSpec.FileHeader.DICTIONARY_LOCALE_ATTRIBUTE)),
+                Dictionary.TYPE_USER /* Dictionary type. Does not matter for us */,
+                true /* isUpdatable */);
+        if (!binaryDict.isValidDictionary()) {
+            // Somehow createEmptyDictFile returned true, but the file was not created correctly
+            throw new IOException("Cannot create dictionary file");
+        }
+        for (final Word word : dict) {
+            // TODO: switch to addMultipleDictionaryEntries when they support shortcuts
+            if (null == word.mShortcutTargets || word.mShortcutTargets.isEmpty()) {
+                binaryDict.addUnigramWord(word.mWord, word.mFrequency,
+                        null /* shortcutTarget */, 0 /* shortcutProbability */,
+                        word.mIsNotAWord, word.mIsBlacklistEntry, 0 /* timestamp */);
+            } else {
+                for (final WeightedString shortcutTarget : word.mShortcutTargets) {
+                    binaryDict.addUnigramWord(word.mWord, word.mFrequency,
+                            shortcutTarget.mWord, shortcutTarget.mFrequency,
+                            word.mIsNotAWord, word.mIsBlacklistEntry, 0 /* timestamp */);
+                }
+            }
+            if (binaryDict.needsToRunGC(true /* mindsBlockByGC */)) {
+                binaryDict.flushWithGC();
             }
         }
-
-        MakedictLog.i("Computing addresses...");
-        BinaryDictEncoderUtils.computeAddresses(dict, flatNodes, formatOptions);
-        if (MakedictLog.DBG) BinaryDictEncoderUtils.checkFlatPtNodeArrayList(flatNodes);
-
-        writeTerminalData(flatNodes, terminalCount);
-        if (formatOptions.mHasTimestamp) {
-            initUnigramTimestamps(terminalCount);
+        for (final Word word0 : dict) {
+            if (null == word0.mBigrams) continue;
+            for (final WeightedString word1 : word0.mBigrams) {
+                binaryDict.addBigramWords(word0.mWord, word1.mWord, word1.mFrequency,
+                        0 /* timestamp */);
+                if (binaryDict.needsToRunGC(true /* mindsBlockByGC */)) {
+                    binaryDict.flushWithGC();
+                }
+            }
         }
-        mBigramWriter = new BigramContentWriter(mBaseFilename, terminalCount, mDictDir,
-                formatOptions.mHasTimestamp);
-        writeBigrams(flatNodes, dict);
-        mShortcutWriter = new ShortcutContentWriter(mBaseFilename, terminalCount, mDictDir);
-        writeShortcuts(flatNodes);
-
-        final PtNodeArray lastNodeArray = flatNodes.get(flatNodes.size() - 1);
-        final int bufferSize = lastNodeArray.mCachedAddressAfterUpdate + lastNodeArray.mCachedSize;
-        mTrieBuf = new byte[bufferSize];
-
-        MakedictLog.i("Writing file...");
-        for (PtNodeArray nodeArray : flatNodes) {
-            BinaryDictEncoderUtils.writePlacedPtNodeArray(dict, this, nodeArray, formatOptions);
-        }
-        if (MakedictLog.DBG) {
-            BinaryDictEncoderUtils.showStatistics(flatNodes);
-            MakedictLog.i("has " + terminalCount + " terminals.");
-        }
-        mTrieOutStream.write(mTrieBuf);
-
-        MakedictLog.i("Done");
-        close();
+        binaryDict.flushWithGC();
+        binaryDict.close();
     }
 
     @Override
     public void setPosition(int position) {
-        if (mTrieBuf == null || position < 0 || position >- mTrieBuf.length) return;
-        mTriePos = position;
     }
 
     @Override
     public int getPosition() {
-        return mTriePos;
+        return 0;
     }
 
     @Override
     public void writePtNodeCount(int ptNodeCount) {
-        final int countSize = BinaryDictIOUtils.getPtNodeCountSize(ptNodeCount);
-        // ptNodeCount must fit on one byte or two bytes.
-        // Please see comments in FormatSpec
-        if (countSize != 1 && countSize != 2) {
-            throw new RuntimeException("Strange size from getPtNodeCountSize : " + countSize);
-        }
-        final int encodedPtNodeCount = (countSize == 2) ?
-                (ptNodeCount | FormatSpec.LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG) : ptNodeCount;
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos, encodedPtNodeCount,
-                countSize);
-    }
-
-    private void writePtNodeFlags(final PtNode ptNode, final FormatOptions formatOptions) {
-        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos,
-                BinaryDictEncoderUtils.makePtNodeFlags(ptNode, childrenPos, formatOptions),
-                FormatSpec.PTNODE_FLAGS_SIZE);
-    }
-
-    private void writeParentPosition(int parentPos, final PtNode ptNode,
-            final FormatOptions formatOptions) {
-        if (parentPos != FormatSpec.NO_PARENT_ADDRESS) {
-            parentPos -= ptNode.mCachedAddressAfterUpdate;
-        }
-        mTriePos = BinaryDictEncoderUtils.writeParentAddress(mTrieBuf, mTriePos, parentPos,
-                formatOptions);
-    }
-
-    private void writeCharacters(final int[] characters, final boolean hasSeveralChars) {
-        mTriePos = CharEncoding.writeCharArray(characters, mTrieBuf, mTriePos);
-        if (hasSeveralChars) {
-            mTrieBuf[mTriePos++] = FormatSpec.PTNODE_CHARACTERS_TERMINATOR;
-        }
-    }
-
-    private void writeTerminalId(final int terminalId) {
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos, terminalId,
-                FormatSpec.PTNODE_TERMINAL_ID_SIZE);
-    }
-
-    private void writeChildrenPosition(PtNode ptNode, FormatOptions formatOptions) {
-        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
-        if (formatOptions.mSupportsDynamicUpdate) {
-            mTriePos += BinaryDictEncoderUtils.writeSignedChildrenPosition(mTrieBuf,
-                    mTriePos, childrenPos);
-        } else {
-            mTriePos += BinaryDictEncoderUtils.writeChildrenPosition(mTrieBuf,
-                    mTriePos, childrenPos);
-        }
-    }
-
-    private void writeBigrams(final ArrayList<PtNodeArray> flatNodes, final FusionDictionary dict)
-            throws IOException {
-        mBigramWriter.openStreams();
-        for (final PtNodeArray nodeArray : flatNodes) {
-            for (final PtNode ptNode : nodeArray.mData) {
-                if (ptNode.mBigrams != null) {
-                    mBigramWriter.writeBigramsForOneWord(ptNode.mTerminalId, ptNode.mBigrams.size(),
-                            ptNode.mBigrams.iterator(), dict);
-                }
-            }
-        }
-        mBigramWriter.closeStreams();
-    }
-
-    private void writeShortcuts(final ArrayList<PtNodeArray> flatNodes) throws IOException {
-        mShortcutWriter.openStreams();
-        for (final PtNodeArray nodeArray : flatNodes) {
-            for (final PtNode ptNode : nodeArray.mData) {
-                if (ptNode.mShortcutTargets != null && !ptNode.mShortcutTargets.isEmpty()) {
-                    mShortcutWriter.writeShortcutForOneWord(ptNode.mTerminalId,
-                            ptNode.mShortcutTargets.iterator());
-                }
-            }
-        }
-        mShortcutWriter.closeStreams();
     }
 
     @Override
     public void writeForwardLinkAddress(int forwardLinkAddress) {
-        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos,
-                forwardLinkAddress, FormatSpec.FORWARD_LINK_ADDRESS_SIZE);
     }
 
     @Override
-    public void writePtNode(final PtNode ptNode, final int parentPosition,
-            final FormatOptions formatOptions, final FusionDictionary dict) {
-        writePtNodeFlags(ptNode, formatOptions);
-        writeParentPosition(parentPosition, ptNode, formatOptions);
-        writeCharacters(ptNode.mChars, ptNode.hasSeveralChars());
-        if (ptNode.isTerminal()) {
-            writeTerminalId(ptNode.mTerminalId);
-        }
-        writeChildrenPosition(ptNode, formatOptions);
-    }
-
-    private void writeTerminalData(final ArrayList<PtNodeArray> flatNodes,
-          final int terminalCount) throws IOException {
-        final byte[] freqBuf = new byte[terminalCount * FormatSpec.FREQUENCY_AND_FLAGS_SIZE];
-        final byte[] terminalAddressTableBuf =
-                new byte[terminalCount * FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE];
-        for (final PtNodeArray nodeArray : flatNodes) {
-            for (final PtNode ptNode : nodeArray.mData) {
-                if (ptNode.isTerminal()) {
-                    BinaryDictEncoderUtils.writeUIntToBuffer(freqBuf,
-                            ptNode.mTerminalId * FormatSpec.FREQUENCY_AND_FLAGS_SIZE,
-                            ptNode.mFrequency, FormatSpec.FREQUENCY_AND_FLAGS_SIZE);
-                    BinaryDictEncoderUtils.writeUIntToBuffer(terminalAddressTableBuf,
-                            ptNode.mTerminalId * FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE,
-                            ptNode.mCachedAddressAfterUpdate + mHeaderSize,
-                            FormatSpec.TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE);
-                }
-            }
-        }
-        mFreqOutStream.write(freqBuf);
-        mTerminalAddressTableOutStream.write(terminalAddressTableBuf);
-    }
-
-    private void initUnigramTimestamps(final int terminalCount) throws IOException {
-        // Initial value of time stamps for each word is 0.
-        final byte[] unigramTimestampBuf =
-                new byte[terminalCount * FormatSpec.UNIGRAM_TIMESTAMP_SIZE];
-        mUnigramTimestampOutStream.write(unigramTimestampBuf);
+    public void writePtNode(
+            PtNode ptNode, int parentPosition, FormatOptions formatOptions, FusionDictionary dict) {
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
deleted file mode 100644
index 3d8f186..0000000
--- a/java/src/com/android/inputmethod/latin/makedict/Ver4DictUpdater.java
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.makedict;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
-
-import java.io.File;
-import java.io.IOException;
-import java.util.ArrayList;
-
-/**
- * An implementation of DictUpdater for version 4 binary dictionary.
- */
-@UsedForTesting
-public class Ver4DictUpdater extends Ver4DictDecoder implements DictUpdater {
-
-    @UsedForTesting
-    public Ver4DictUpdater(final File dictDirectory, final int factoryType) {
-        // DictUpdater must have an updatable DictBuffer.
-        super(dictDirectory, ((factoryType & MASK_DICTBUFFER) == USE_BYTEARRAY)
-                ? USE_BYTEARRAY : USE_WRITABLE_BYTEBUFFER);
-    }
-
-    @Override
-    public void deleteWord(final String word) throws IOException, UnsupportedFormatException {
-        if (mDictBuffer == null) openDictBuffer();
-        readHeader();
-        final int wordPos = getTerminalPosition(word);
-        if (wordPos != FormatSpec.NOT_VALID_WORD) {
-            mDictBuffer.position(wordPos);
-            final int flags = PtNodeReader.readPtNodeOptionFlags(mDictBuffer);
-            mDictBuffer.position(wordPos);
-            mDictBuffer.put((byte) DynamicBinaryDictIOUtils.markAsDeleted(flags));
-        }
-    }
-
-    @Override
-    public void insertWord(final String word, final int frequency,
-        final ArrayList<WeightedString> bigramStrings, final ArrayList<WeightedString> shortcuts,
-        final boolean isNotAWord, final boolean isBlackListEntry)
-                throws IOException, UnsupportedFormatException {
-        // TODO: Implement this method.
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
index 1de15a3..701c290 100644
--- a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
+++ b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
@@ -17,18 +17,16 @@
 package com.android.inputmethod.latin.personalization;
 
 import android.content.Context;
-import android.content.SharedPreferences;
 import android.util.Log;
 
 import com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.latin.BinaryDictionary.LanguageModelParam;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.ExpandableBinaryDictionary;
-import com.android.inputmethod.latin.LatinImeLogger;
 import com.android.inputmethod.latin.makedict.DictDecoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.settings.Settings;
-import com.android.inputmethod.latin.utils.CollectionUtils;
+import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.OnAddWordListener;
 
@@ -36,7 +34,9 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
+import java.util.concurrent.TimeUnit;
 
 /**
  * This class is a base class of a dictionary that supports decaying for the personalized language
@@ -45,8 +45,7 @@
 public abstract class DecayingExpandableBinaryDictionaryBase extends ExpandableBinaryDictionary {
     private static final String TAG = DecayingExpandableBinaryDictionaryBase.class.getSimpleName();
     public static final boolean DBG_SAVE_RESTORE = false;
-    private static final boolean DBG_STRESS_TEST = false;
-    private static final boolean PROFILE_SAVE_RESTORE = LatinImeLogger.sDBG;
+    private static final boolean DBG_DUMP_ON_CLOSE = false;
 
     /** Any pair being typed or picked */
     public static final int FREQUENCY_FOR_TYPED = 2;
@@ -54,52 +53,56 @@
     public static final int FREQUENCY_FOR_WORDS_IN_DICTS = FREQUENCY_FOR_TYPED;
     public static final int FREQUENCY_FOR_WORDS_NOT_IN_DICTS = Dictionary.NOT_A_PROBABILITY;
 
-    /** Locale for which this user history dictionary is storing words */
-    private final String mLocale;
+    public static final int REQUIRED_BINARY_DICTIONARY_VERSION = FormatSpec.VERSION4;
 
-    private final String mFileName;
+    /** The locale for this dictionary. */
+    public final Locale mLocale;
 
-    private final SharedPreferences mPrefs;
-
-    private final ArrayList<PersonalizationDictionaryUpdateSession> mSessions =
-            CollectionUtils.newArrayList();
-
-    // Should always be false except when we use this class for test
-    @UsedForTesting boolean mIsTest = false;
+    private final String mDictName;
 
     /* package */ DecayingExpandableBinaryDictionaryBase(final Context context,
-            final String locale, final SharedPreferences sp, final String dictionaryType,
-            final String fileName) {
-        super(context, fileName, dictionaryType, true);
+            final Locale locale, final String dictionaryType, final String dictName) {
+        super(context, dictName, locale, dictionaryType, true);
         mLocale = locale;
-        mFileName = fileName;
-        mPrefs = sp;
-        if (mLocale != null && mLocale.length() > 1) {
-            asyncLoadDictionaryToMemory();
+        mDictName = dictName;
+        if (mLocale != null && mLocale.toString().length() > 1) {
+            reloadDictionaryIfRequired();
+        }
+    }
+
+    // Creates an instance that uses a given dictionary file for testing.
+    @UsedForTesting
+    /* package */ DecayingExpandableBinaryDictionaryBase(final Context context,
+            final Locale locale, final String dictionaryType, final String dictName,
+            final File dictFile) {
+        super(context, dictName, locale, dictionaryType, true, dictFile);
+        mLocale = locale;
+        mDictName = dictName;
+        if (mLocale != null && mLocale.toString().length() > 1) {
             reloadDictionaryIfRequired();
         }
     }
 
     @Override
     public void close() {
-        if (!ExpandableBinaryDictionary.ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE) {
-            closeBinaryDictionary();
+        if (DBG_DUMP_ON_CLOSE) {
+            dumpAllWordsForDebug();
         }
         // Flush pending writes.
-        // TODO: Remove after this class become to use a dynamic binary dictionary.
-        asyncFlashAllBinaryDictionary();
-        Settings.writeLastUserHistoryWriteTime(mPrefs, mLocale);
+        asyncFlushBinaryDictionary();
     }
 
     @Override
     protected Map<String, String> getHeaderAttributeMap() {
         HashMap<String, String> attributeMap = new HashMap<String, String>();
-        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
-                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
         attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
                 FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
-        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_ID_ATTRIBUTE, mFileName);
-        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_LOCALE_ATTRIBUTE, mLocale);
+        attributeMap.put(FormatSpec.FileHeader.HAS_HISTORICAL_INFO_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_ID_ATTRIBUTE, mDictName);
+        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_LOCALE_ATTRIBUTE, mLocale.toString());
+        attributeMap.put(FormatSpec.FileHeader.DICTIONARY_VERSION_ATTRIBUTE,
+                String.valueOf(TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())));
         return attributeMap;
     }
 
@@ -113,6 +116,25 @@
         return false;
     }
 
+    @Override
+    protected boolean matchesExpectedBinaryDictFormatVersionForThisType(final int formatVersion) {
+        // This class is using format 4 because it's used by all version 4 dictionaries.
+        // TODO: remove this when all dynamically generated dicts use version 4.
+        return formatVersion == REQUIRED_BINARY_DICTIONARY_VERSION;
+    }
+
+    public void addMultipleDictionaryEntriesToDictionary(
+            final ArrayList<LanguageModelParam> languageModelParams,
+            final ExpandableBinaryDictionary.AddMultipleDictionaryEntriesCallback callback) {
+        if (languageModelParams == null || languageModelParams.isEmpty()) {
+            if (callback != null) {
+                callback.onFinished();
+            }
+            return;
+        }
+        addMultipleDictionaryEntriesDynamically(languageModelParams, callback);
+    }
+
     /**
      * Pair will be added to the decaying dictionary.
      *
@@ -121,70 +143,63 @@
      * context, as in beginning of a sentence for example.
      * The second word may not be null (a NullPointerException would be thrown).
      */
-    public void addToDictionary(final String word0, final String word1, final boolean isValid) {
+    public void addToDictionary(final String word0, final String word1, final boolean isValid,
+            final int timestamp) {
         if (word1.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH ||
                 (word0 != null && word0.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH)) {
             return;
         }
-        final int frequency = ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE ?
-                (isValid ? FREQUENCY_FOR_WORDS_IN_DICTS : FREQUENCY_FOR_WORDS_NOT_IN_DICTS) :
-                        FREQUENCY_FOR_TYPED;
-        addWordDynamically(word1, null /* shortcutTarget */, frequency, 0 /* shortcutFreq */,
-                false /* isNotAWord */);
+        final int frequency = isValid ?
+                FREQUENCY_FOR_WORDS_IN_DICTS : FREQUENCY_FOR_WORDS_NOT_IN_DICTS;
+        addWordDynamically(word1, frequency, null /* shortcutTarget */, 0 /* shortcutFreq */,
+                false /* isNotAWord */, false /* isBlacklisted */, timestamp);
         // Do not insert a word as a bigram of itself
         if (word1.equals(word0)) {
             return;
         }
         if (null != word0) {
-            addBigramDynamically(word0, word1, frequency, isValid);
+            addBigramDynamically(word0, word1, frequency, timestamp);
         }
     }
 
-    public void cancelAddingUserHistory(final String word0, final String word1) {
-        removeBigramDynamically(word0, word1);
-    }
-
     @Override
     protected void loadDictionaryAsync() {
-        final int[] profTotalCount = { 0 };
-        final String locale = getLocale();
-        if (DBG_STRESS_TEST) {
-            try {
-                Log.w(TAG, "Start stress in loading: " + locale);
-                Thread.sleep(15000);
-                Log.w(TAG, "End stress in loading");
-            } catch (InterruptedException e) {
+        // Never loaded to memory in Java side.
+    }
+
+    @UsedForTesting
+    public void dumpAllWordsForDebug() {
+        runAfterGcForDebug(new Runnable() {
+            @Override
+            public void run() {
+                dumpAllWordsForDebugLocked();
             }
-        }
-        final long last = Settings.readLastUserHistoryWriteTime(mPrefs, locale);
-        final long now = System.currentTimeMillis();
-        final ExpandableBinaryDictionary dictionary = this;
+        });
+    }
+
+    private void dumpAllWordsForDebugLocked() {
+        Log.d(TAG, "dumpAllWordsForDebug started.");
         final OnAddWordListener listener = new OnAddWordListener() {
             @Override
             public void setUnigram(final String word, final String shortcutTarget,
                     final int frequency, final int shortcutFreq) {
-                if (DBG_SAVE_RESTORE) {
-                    Log.d(TAG, "load unigram: " + word + "," + frequency);
-                }
-                addWord(word, shortcutTarget, frequency, shortcutFreq, false /* isNotAWord */);
-                ++profTotalCount[0];
+                Log.d(TAG, "load unigram: " + word + "," + frequency);
             }
 
             @Override
             public void setBigram(final String word0, final String word1, final int frequency) {
                 if (word0.length() < Constants.DICTIONARY_MAX_WORD_LENGTH
                         && word1.length() < Constants.DICTIONARY_MAX_WORD_LENGTH) {
-                    if (DBG_SAVE_RESTORE) {
-                        Log.d(TAG, "load bigram: " + word0 + "," + word1 + "," + frequency);
-                    }
-                    ++profTotalCount[0];
-                    addBigram(word0, word1, frequency, last);
+                    Log.d(TAG, "load bigram: " + word0 + "," + word1 + "," + frequency);
+                } else {
+                    Log.d(TAG, "Skip inserting a too long bigram: " + word0 + "," + word1 + ","
+                            + frequency);
                 }
             }
         };
 
         // Load the dictionary from binary file
-        final File dictFile = new File(mContext.getFilesDir(), mFileName);
+        final File dictFile = new File(mContext.getFilesDir(), mDictName);
         final DictDecoder dictDecoder = FormatSpec.getDictDecoder(dictFile,
                 DictDecoder.USE_BYTEARRAY);
         if (dictDecoder == null) {
@@ -198,35 +213,17 @@
             UserHistoryDictIOUtils.readDictionaryBinary(dictDecoder, listener);
         } catch (IOException e) {
             Log.d(TAG, "IOException on opening a bytebuffer", e);
-        } finally {
-            if (PROFILE_SAVE_RESTORE) {
-                final long diff = System.currentTimeMillis() - now;
-                Log.d(TAG, "PROF: Load UserHistoryDictionary: "
-                        + locale + ", " + diff + "ms. load " + profTotalCount[0] + "entries.");
-            }
+        } catch (UnsupportedFormatException e) {
+            Log.d(TAG, "Unsupported format, can't read the dictionary", e);
         }
     }
 
-    protected String getLocale() {
-        return mLocale;
-    }
-
-    public void registerUpdateSession(PersonalizationDictionaryUpdateSession session) {
-        session.setPredictionDictionary(this);
-        mSessions.add(session);
-        session.onDictionaryReady();
-    }
-
-    public void unRegisterUpdateSession(PersonalizationDictionaryUpdateSession session) {
-        mSessions.remove(session);
-    }
-
     @UsedForTesting
     public void clearAndFlushDictionary() {
         // Clear the node structure on memory
         clear();
         // Then flush the cleared state of the dictionary on disk.
-        asyncFlashAllBinaryDictionary();
+        asyncFlushBinaryDictionary();
     }
 
     /* package */ void decayIfNeeded() {
diff --git a/java/src/com/android/inputmethod/latin/personalization/DynamicPersonalizationDictionaryWriter.java b/java/src/com/android/inputmethod/latin/personalization/DynamicPersonalizationDictionaryWriter.java
deleted file mode 100644
index 6f152bb..0000000
--- a/java/src/com/android/inputmethod/latin/personalization/DynamicPersonalizationDictionaryWriter.java
+++ /dev/null
@@ -1,190 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.personalization;
-
-import android.content.Context;
-
-import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.compat.ActivityManagerCompatUtils;
-import com.android.inputmethod.keyboard.ProximityInfo;
-import com.android.inputmethod.latin.AbstractDictionaryWriter;
-import com.android.inputmethod.latin.ExpandableDictionary;
-import com.android.inputmethod.latin.WordComposer;
-import com.android.inputmethod.latin.ExpandableDictionary.NextWord;
-import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
-import com.android.inputmethod.latin.makedict.DictEncoder;
-import com.android.inputmethod.latin.makedict.FormatSpec;
-import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils;
-import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.BigramDictionaryInterface;
-import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils;
-import com.android.inputmethod.latin.utils.UserHistoryForgettingCurveUtils.ForgettingCurveParams;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Map;
-
-// Currently this class is used to implement dynamic prodiction dictionary.
-// TODO: Move to native code.
-public class DynamicPersonalizationDictionaryWriter extends AbstractDictionaryWriter {
-    private static final String TAG = DynamicPersonalizationDictionaryWriter.class.getSimpleName();
-    /** Maximum number of pairs. Pruning will start when databases goes above this number. */
-    public static final int DEFAULT_MAX_HISTORY_BIGRAMS = 10000;
-    public static final int LOW_MEMORY_MAX_HISTORY_BIGRAMS = 2000;
-
-    /** Any pair being typed or picked */
-    private static final int FREQUENCY_FOR_TYPED = 2;
-
-    private static final int BINARY_DICT_VERSION = 3;
-    private static final FormatSpec.FormatOptions FORMAT_OPTIONS =
-            new FormatSpec.FormatOptions(BINARY_DICT_VERSION, true /* supportsDynamicUpdate */);
-
-    private final UserHistoryDictionaryBigramList mBigramList =
-            new UserHistoryDictionaryBigramList();
-    private final ExpandableDictionary mExpandableDictionary;
-    private final int mMaxHistoryBigrams;
-
-    public DynamicPersonalizationDictionaryWriter(final Context context, final String dictType) {
-        super(context, dictType);
-        mExpandableDictionary = new ExpandableDictionary(dictType);
-        final boolean isLowRamDevice = ActivityManagerCompatUtils.isLowRamDevice(context);
-        mMaxHistoryBigrams = isLowRamDevice ?
-                LOW_MEMORY_MAX_HISTORY_BIGRAMS : DEFAULT_MAX_HISTORY_BIGRAMS;
-    }
-
-    @Override
-    public void clear() {
-        mBigramList.evictAll();
-        mExpandableDictionary.clearDictionary();
-    }
-
-    /**
-     * Adds a word unigram to the fusion dictionary. Call updateBinaryDictionary when all changes
-     * are done to update the binary dictionary.
-     * @param word The word to add.
-     * @param shortcutTarget A shortcut target for this word, or null if none.
-     * @param frequency The frequency for this unigram.
-     * @param shortcutFreq The frequency of the shortcut (0~15, with 15 = whitelist). Ignored
-     *   if shortcutTarget is null.
-     * @param isNotAWord true if this is not a word, i.e. shortcut only.
-     */
-    @Override
-    public void addUnigramWord(final String word, final String shortcutTarget, final int frequency,
-            final int shortcutFreq, final boolean isNotAWord) {
-        if (mBigramList.size() > mMaxHistoryBigrams * 2) {
-            // Too many entries: just stop adding new vocabulary and wait next refresh.
-            return;
-        }
-        mExpandableDictionary.addWord(word, shortcutTarget, frequency, shortcutFreq);
-        mBigramList.addBigram(null, word, (byte)frequency);
-    }
-
-    @Override
-    public void addBigramWords(final String word0, final String word1, final int frequency,
-            final boolean isValid, final long lastModifiedTime) {
-        if (mBigramList.size() > mMaxHistoryBigrams * 2) {
-            // Too many entries: just stop adding new vocabulary and wait next refresh.
-            return;
-        }
-        if (lastModifiedTime > 0) {
-            mExpandableDictionary.setBigramAndGetFrequency(word0, word1,
-                    new ForgettingCurveParams(frequency, System.currentTimeMillis(),
-                            lastModifiedTime));
-            mBigramList.addBigram(word0, word1, (byte)frequency);
-        } else {
-            mExpandableDictionary.setBigramAndGetFrequency(word0, word1,
-                    new ForgettingCurveParams(isValid));
-            mBigramList.addBigram(word0, word1, (byte)frequency);
-        }
-    }
-
-    @Override
-    public void removeBigramWords(final String word0, final String word1) {
-        if (mBigramList.removeBigram(word0, word1)) {
-            mExpandableDictionary.removeBigram(word0, word1);
-        }
-    }
-
-    @Override
-    protected void writeDictionary(final DictEncoder dictEncoder,
-            final Map<String, String> attributeMap) throws IOException, UnsupportedFormatException {
-        UserHistoryDictIOUtils.writeDictionary(dictEncoder,
-                new FrequencyProvider(mBigramList, mExpandableDictionary, mMaxHistoryBigrams),
-                mBigramList, FORMAT_OPTIONS);
-    }
-
-    private static class FrequencyProvider implements BigramDictionaryInterface {
-        private final UserHistoryDictionaryBigramList mBigramList;
-        private final ExpandableDictionary mExpandableDictionary;
-        private final int mMaxHistoryBigrams;
-
-        public FrequencyProvider(final UserHistoryDictionaryBigramList bigramList,
-                final ExpandableDictionary expandableDictionary, final int maxHistoryBigrams) {
-            mBigramList = bigramList;
-            mExpandableDictionary = expandableDictionary;
-            mMaxHistoryBigrams = maxHistoryBigrams;
-        }
-
-        @Override
-        public int getFrequency(final String word0, final String word1) {
-            final int freq;
-            if (word0 == null) { // unigram
-                freq = FREQUENCY_FOR_TYPED;
-            } else { // bigram
-                final NextWord nw = mExpandableDictionary.getBigramWord(word0, word1);
-                if (nw != null) {
-                    final ForgettingCurveParams forgettingCurveParams = nw.getFcParams();
-                    final byte prevFc = mBigramList.getBigrams(word0).get(word1);
-                    final byte fc = forgettingCurveParams.getFc();
-                    final boolean isValid = forgettingCurveParams.isValid();
-                    if (prevFc > 0 && prevFc == fc) {
-                        freq = fc & 0xFF;
-                    } else if (UserHistoryForgettingCurveUtils.
-                            needsToSave(fc, isValid, mBigramList.size() <= mMaxHistoryBigrams)) {
-                        freq = fc & 0xFF;
-                    } else {
-                        // Delete this entry
-                        freq = -1;
-                    }
-                } else {
-                    // Delete this entry
-                    freq = -1;
-                }
-            }
-            return freq;
-        }
-    }
-
-    @Override
-    public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
-            final String prevWord, final ProximityInfo proximityInfo,
-            boolean blockOffensiveWords, final int[] additionalFeaturesOptions) {
-        return mExpandableDictionary.getSuggestions(composer, prevWord, proximityInfo,
-                blockOffensiveWords, additionalFeaturesOptions);
-    }
-
-    @Override
-    public boolean isValidWord(final String word) {
-        return mExpandableDictionary.isValidWord(word);
-    }
-
-    @UsedForTesting
-    public boolean isInBigramListForTests(final String word) {
-        // TODO: Use native method to determine whether the word is in dictionary or not
-        return mBigramList.containsKey(word) || mBigramList.getBigrams(null).containsKey(word);
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java
index f257165..9b2b981 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionary.java
@@ -16,53 +16,37 @@
 
 package com.android.inputmethod.latin.personalization;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.Dictionary;
-import com.android.inputmethod.latin.ExpandableBinaryDictionary;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 
-import android.content.Context;
-import android.content.SharedPreferences;
-
+import java.io.File;
 import java.util.ArrayList;
+import java.util.Locale;
 
-/**
- * This class is a dictionary for the personalized language model that uses binary dictionary.
- */
-public class PersonalizationDictionary extends ExpandableBinaryDictionary {
-    private static final String NAME = "personalization";
+import android.content.Context;
+
+public class PersonalizationDictionary extends DecayingExpandableBinaryDictionaryBase {
+    /* package */ static final String NAME = PersonalizationDictionary.class.getSimpleName();
+
     private final ArrayList<PersonalizationDictionaryUpdateSession> mSessions =
             CollectionUtils.newArrayList();
 
-    /** Locale for which this user history dictionary is storing words */
-    private final String mLocale;
-
-    public PersonalizationDictionary(final Context context, final String locale,
-            final SharedPreferences prefs) {
-        // TODO: Make isUpdatable true.
-        super(context, getFilenameWithLocale(NAME, locale), Dictionary.TYPE_PERSONALIZATION,
-                false /* isUpdatable */);
-        mLocale = locale;
-        // TODO: Restore last updated time
-        loadDictionary();
+    /* package */ PersonalizationDictionary(final Context context, final Locale locale) {
+        super(context, locale, Dictionary.TYPE_PERSONALIZATION,
+                getDictNameWithLocale(NAME, locale));
     }
 
-    @Override
-    protected void loadDictionaryAsync() {
-        // TODO: Implement
-    }
-
-    @Override
-    protected boolean hasContentChanged() {
-        return false;
-    }
-
-    @Override
-    protected boolean needsToReloadBeforeWriting() {
-        return false;
+    // Creates an instance that uses a given dictionary file for testing.
+    @UsedForTesting
+    public PersonalizationDictionary(final Context context, final Locale locale,
+            final File dictFile) {
+        super(context, locale, Dictionary.TYPE_PERSONALIZATION, getDictNameWithLocale(NAME, locale),
+                dictFile);
     }
 
     public void registerUpdateSession(PersonalizationDictionaryUpdateSession session) {
-        session.setDictionary(this);
+        session.setPredictionDictionary(this);
         mSessions.add(session);
         session.onDictionaryReady();
     }
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionarySessionRegister.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionarySessionRegistrar.java
similarity index 69%
rename from java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionarySessionRegister.java
rename to java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionarySessionRegistrar.java
index c1833ff..9a897a5 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionarySessionRegister.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionarySessionRegistrar.java
@@ -19,19 +19,22 @@
 import android.content.Context;
 import android.content.res.Configuration;
 
-public class PersonalizationDictionarySessionRegister {
-    public static void init(Context context) {
+public class PersonalizationDictionarySessionRegistrar {
+    public static void init(final Context context) {
     }
 
     public static void onConfigurationChanged(final Context context, final Configuration conf) {
     }
 
-    public static void onUpdateData(Context context, String type) {
+    public static void onUpdateData(final Context context, final String type) {
     }
 
-    public static void onRemoveData(Context context, String type) {
+    public static void onRemoveData(final Context context, final String type) {
     }
 
-    public static void onDestroy(Context context) {
+    public static void resetAll(final Context context) {
+    }
+
+    public static void close(final Context context) {
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
index a86f6e5..6135476 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
@@ -18,61 +18,37 @@
 
 import android.content.Context;
 
+import com.android.inputmethod.latin.BinaryDictionary.LanguageModelParam;
+import com.android.inputmethod.latin.ExpandableBinaryDictionary;
+
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
+import java.util.Locale;
 
 /**
  * This class is a session where a data provider can communicate with a personalization
  * dictionary.
  */
 public abstract class PersonalizationDictionaryUpdateSession {
-    /**
-     * This class is a parameter for a new unigram or bigram word which will be added
-     * to the personalization dictionary.
-     */
-    public static class PersonalizationLanguageModelParam {
-        public final String mWord0;
-        public final String mWord1;
-        public final boolean mIsValid;
-        public final int mFrequency;
-        public PersonalizationLanguageModelParam(String word0, String word1, boolean isValid,
-                int frequency) {
-            mWord0 = word0;
-            mWord1 = word1;
-            mIsValid = isValid;
-            mFrequency = frequency;
-        }
-    }
-
-    // TODO: Use a dynamic binary dictionary instead
     public WeakReference<PersonalizationDictionary> mDictionary;
-    public WeakReference<DecayingExpandableBinaryDictionaryBase> mPredictionDictionary;
-    public final String mSystemLocale;
-    public PersonalizationDictionaryUpdateSession(String locale) {
+    public final Locale mSystemLocale;
+
+    public PersonalizationDictionaryUpdateSession(final Locale locale) {
         mSystemLocale = locale;
     }
 
     public abstract void onDictionaryReady();
 
-    public abstract void onDictionaryClosed(Context context);
+    public abstract void onDictionaryClosed(final Context context);
 
-    public void setDictionary(PersonalizationDictionary dictionary) {
+    public void setPredictionDictionary(final PersonalizationDictionary dictionary) {
         mDictionary = new WeakReference<PersonalizationDictionary>(dictionary);
     }
 
-    public void setPredictionDictionary(DecayingExpandableBinaryDictionaryBase dictionary) {
-        mPredictionDictionary =
-                new WeakReference<DecayingExpandableBinaryDictionaryBase>(dictionary);
-    }
-
     protected PersonalizationDictionary getDictionary() {
         return mDictionary == null ? null : mDictionary.get();
     }
 
-    protected DecayingExpandableBinaryDictionaryBase getPredictionDictionary() {
-        return mPredictionDictionary == null ? null : mPredictionDictionary.get();
-    }
-
     private void unsetDictionary() {
         final PersonalizationDictionary dictionary = getDictionary();
         if (dictionary == null) {
@@ -81,48 +57,30 @@
         dictionary.unRegisterUpdateSession(this);
     }
 
-    private void unsetPredictionDictionary() {
-        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
-        if (dictionary == null) {
-            return;
-        }
-        dictionary.unRegisterUpdateSession(this);
-    }
-
-    public void clearAndFlushPredictionDictionary(Context context) {
-        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
+    public void clearAndFlushDictionary(final Context context) {
+        final PersonalizationDictionary dictionary = getDictionary();
         if (dictionary == null) {
             return;
         }
         dictionary.clearAndFlushDictionary();
     }
 
-    public void closeSession(Context context) {
+    public void closeSession(final Context context) {
         unsetDictionary();
-        unsetPredictionDictionary();
         onDictionaryClosed(context);
     }
 
-    // TODO: Support multi locale to add bigram
-    public void addBigramToPersonalizationDictionary(String word0, String word1, boolean isValid,
-            int frequency) {
-        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
+    // TODO: Support multi locale.
+    public void addMultipleDictionaryEntriesToDictionary(
+            final ArrayList<LanguageModelParam> languageModelParams,
+            final ExpandableBinaryDictionary.AddMultipleDictionaryEntriesCallback callback) {
+        final PersonalizationDictionary dictionary = getDictionary();
         if (dictionary == null) {
+            if (callback != null) {
+                callback.onFinished();
+            }
             return;
         }
-        dictionary.addToDictionary(word0, word1, isValid);
-    }
-
-    // Bulk import
-    // TODO: Support multi locale to add bigram
-    public void addBigramsToPersonalizationDictionary(
-            final ArrayList<PersonalizationLanguageModelParam> lmParams) {
-        final DecayingExpandableBinaryDictionaryBase dictionary = getPredictionDictionary();
-        if (dictionary == null) {
-            return;
-        }
-        for (final PersonalizationLanguageModelParam lmParam : lmParams) {
-            dictionary.addToDictionary(lmParam.mWord0, lmParam.mWord1, lmParam.mIsValid);
-        }
+        dictionary.addMultipleDictionaryEntriesToDictionary(languageModelParams, callback);
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java
index 221ddee..38b22e5 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java
@@ -17,13 +17,15 @@
 package com.android.inputmethod.latin.personalization;
 
 import com.android.inputmethod.latin.utils.CollectionUtils;
+import com.android.inputmethod.latin.utils.FileUtils;
 
 import android.content.Context;
-import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
 import android.util.Log;
 
+import java.io.File;
+import java.io.FilenameFilter;
 import java.lang.ref.SoftReference;
+import java.util.Locale;
 import java.util.concurrent.ConcurrentHashMap;
 
 public class PersonalizationHelper {
@@ -31,21 +33,16 @@
     private static final boolean DEBUG = false;
     private static final ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>
             sLangUserHistoryDictCache = CollectionUtils.newConcurrentHashMap();
-
     private static final ConcurrentHashMap<String, SoftReference<PersonalizationDictionary>>
             sLangPersonalizationDictCache = CollectionUtils.newConcurrentHashMap();
 
-    private static final ConcurrentHashMap<String,
-            SoftReference<PersonalizationPredictionDictionary>>
-                    sLangPersonalizationPredictionDictCache =
-                            CollectionUtils.newConcurrentHashMap();
-
     public static UserHistoryDictionary getUserHistoryDictionary(
-            final Context context, final String locale, final SharedPreferences sp) {
+            final Context context, final Locale locale) {
+        final String localeStr = locale.toString();
         synchronized (sLangUserHistoryDictCache) {
-            if (sLangUserHistoryDictCache.containsKey(locale)) {
+            if (sLangUserHistoryDictCache.containsKey(localeStr)) {
                 final SoftReference<UserHistoryDictionary> ref =
-                        sLangUserHistoryDictCache.get(locale);
+                        sLangUserHistoryDictCache.get(localeStr);
                 final UserHistoryDictionary dict = ref == null ? null : ref.get();
                 if (dict != null) {
                     if (DEBUG) {
@@ -55,8 +52,9 @@
                     return dict;
                 }
             }
-            final UserHistoryDictionary dict = new UserHistoryDictionary(context, locale, sp);
-            sLangUserHistoryDictCache.put(locale, new SoftReference<UserHistoryDictionary>(dict));
+            final UserHistoryDictionary dict = new UserHistoryDictionary(context, locale);
+            sLangUserHistoryDictCache.put(localeStr,
+                    new SoftReference<UserHistoryDictionary>(dict));
             return dict;
         }
     }
@@ -74,58 +72,74 @@
     }
 
     public static void registerPersonalizationDictionaryUpdateSession(final Context context,
-            final PersonalizationDictionaryUpdateSession session, String locale) {
-        final PersonalizationPredictionDictionary predictionDictionary =
-                getPersonalizationPredictionDictionary(context, locale,
-                        PreferenceManager.getDefaultSharedPreferences(context));
-        predictionDictionary.registerUpdateSession(session);
-        final PersonalizationDictionary dictionary =
-                getPersonalizationDictionary(context, locale,
-                        PreferenceManager.getDefaultSharedPreferences(context));
-        dictionary.registerUpdateSession(session);
+            final PersonalizationDictionaryUpdateSession session, final Locale locale) {
+        final PersonalizationDictionary personalizationDictionary =
+                getPersonalizationDictionary(context, locale);
+        personalizationDictionary.registerUpdateSession(session);
     }
 
     public static PersonalizationDictionary getPersonalizationDictionary(
-            final Context context, final String locale, final SharedPreferences sp) {
+            final Context context, final Locale locale) {
+        final String localeStr = locale.toString();
         synchronized (sLangPersonalizationDictCache) {
-            if (sLangPersonalizationDictCache.containsKey(locale)) {
+            if (sLangPersonalizationDictCache.containsKey(localeStr)) {
                 final SoftReference<PersonalizationDictionary> ref =
-                        sLangPersonalizationDictCache.get(locale);
+                        sLangPersonalizationDictCache.get(localeStr);
                 final PersonalizationDictionary dict = ref == null ? null : ref.get();
                 if (dict != null) {
                     if (DEBUG) {
-                        Log.w(TAG, "Use cached PersonalizationDictCache for " + locale);
+                        Log.w(TAG, "Use cached PersonalizationDictionary for " + locale);
                     }
                     return dict;
                 }
             }
-            final PersonalizationDictionary dict =
-                    new PersonalizationDictionary(context, locale, sp);
+            final PersonalizationDictionary dict = new PersonalizationDictionary(context, locale);
             sLangPersonalizationDictCache.put(
-                    locale, new SoftReference<PersonalizationDictionary>(dict));
+                    localeStr, new SoftReference<PersonalizationDictionary>(dict));
             return dict;
         }
     }
 
-    public static PersonalizationPredictionDictionary getPersonalizationPredictionDictionary(
-            final Context context, final String locale, final SharedPreferences sp) {
-        synchronized (sLangPersonalizationPredictionDictCache) {
-            if (sLangPersonalizationPredictionDictCache.containsKey(locale)) {
-                final SoftReference<PersonalizationPredictionDictionary> ref =
-                        sLangPersonalizationPredictionDictCache.get(locale);
-                final PersonalizationPredictionDictionary dict = ref == null ? null : ref.get();
-                if (dict != null) {
-                    if (DEBUG) {
-                        Log.w(TAG, "Use cached PersonalizationPredictionDictionary for " + locale);
+    public static void removeAllPersonalizedDictionaries(final Context context) {
+        removeAllDictionaries(context, sLangUserHistoryDictCache,
+                UserHistoryDictionary.NAME);
+        removeAllDictionaries(context, sLangPersonalizationDictCache,
+                PersonalizationDictionary.NAME);
+    }
+
+    private static <T extends DecayingExpandableBinaryDictionaryBase> void removeAllDictionaries(
+            final Context context, final ConcurrentHashMap<String, SoftReference<T>> dictionaryMap,
+            final String dictNamePrefix) {
+        synchronized (dictionaryMap) {
+            for (final ConcurrentHashMap.Entry<String, SoftReference<T>> entry
+                    : dictionaryMap.entrySet()) {
+                if (entry.getValue() != null) {
+                    final DecayingExpandableBinaryDictionaryBase dict = entry.getValue().get();
+                    if (dict != null) {
+                        dict.clearAndFlushDictionary();
                     }
-                    return dict;
                 }
             }
-            final PersonalizationPredictionDictionary dict =
-                    new PersonalizationPredictionDictionary(context, locale, sp);
-            sLangPersonalizationPredictionDictCache.put(
-                    locale, new SoftReference<PersonalizationPredictionDictionary>(dict));
-            return dict;
+            dictionaryMap.clear();
+            if (!FileUtils.deleteFilteredFiles(
+                    context.getFilesDir(), new DictFilter(dictNamePrefix))) {
+                Log.e(TAG, "Cannot remove all existing dictionary files. filesDir: "
+                        + context.getFilesDir().getAbsolutePath() + ", dictNamePrefix: "
+                        + dictNamePrefix);
+            }
+        }
+    }
+
+    private static class DictFilter implements FilenameFilter {
+        private final String mName;
+
+        DictFilter(final String name) {
+            mName = name;
+        }
+
+        @Override
+        public boolean accept(final File dir, final String name) {
+            return name.startsWith(mName);
         }
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDictionary.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDictionary.java
deleted file mode 100644
index 4329544..0000000
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDictionary.java
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.personalization;
-
-import com.android.inputmethod.latin.Dictionary;
-import com.android.inputmethod.latin.ExpandableBinaryDictionary;
-
-import android.content.Context;
-import android.content.SharedPreferences;
-
-public class PersonalizationPredictionDictionary extends DecayingExpandableBinaryDictionaryBase {
-    private static final String NAME = PersonalizationPredictionDictionary.class.getSimpleName();
-
-    /* package */ PersonalizationPredictionDictionary(final Context context, final String locale,
-            final SharedPreferences sp) {
-        super(context, locale, sp, Dictionary.TYPE_PERSONALIZATION_PREDICTION_IN_JAVA,
-                getDictionaryFileName(locale));
-    }
-
-    private static String getDictionaryFileName(final String locale) {
-        return NAME + "." + locale + ExpandableBinaryDictionary.DICT_FILE_EXTENSION;
-    }
-}
diff --git a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
index a60226d..c23bc9b 100644
--- a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
@@ -16,25 +16,33 @@
 
 package com.android.inputmethod.latin.personalization;
 
+import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.Dictionary;
-import com.android.inputmethod.latin.ExpandableBinaryDictionary;
+
+import java.io.File;
+import java.util.Locale;
 
 import android.content.Context;
-import android.content.SharedPreferences;
 
 /**
  * Locally gathers stats about the words user types and various other signals like auto-correction
  * cancellation or manual picks. This allows the keyboard to adapt to the typist over time.
  */
 public class UserHistoryDictionary extends DecayingExpandableBinaryDictionaryBase {
-    /* package for tests */ static final String NAME =
-            UserHistoryDictionary.class.getSimpleName();
-    /* package */ UserHistoryDictionary(final Context context, final String locale,
-            final SharedPreferences sp) {
-        super(context, locale, sp, Dictionary.TYPE_USER_HISTORY, getDictionaryFileName(locale));
+    /* package */ static final String NAME = UserHistoryDictionary.class.getSimpleName();
+    /* package */ UserHistoryDictionary(final Context context, final Locale locale) {
+        super(context, locale, Dictionary.TYPE_USER_HISTORY, getDictNameWithLocale(NAME, locale));
     }
 
-    private static String getDictionaryFileName(final String locale) {
-        return NAME + "." + locale + ExpandableBinaryDictionary.DICT_FILE_EXTENSION;
+    // Creates an instance that uses a given dictionary file for testing.
+    @UsedForTesting
+    public UserHistoryDictionary(final Context context, final Locale locale,
+            final File dictFile) {
+        super(context, locale, Dictionary.TYPE_USER_HISTORY, getDictNameWithLocale(NAME, locale),
+                dictFile);
+    }
+
+    public void cancelAddingUserHistory(final String word0, final String word1) {
+        removeBigramDynamically(word0, word1);
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/settings/DebugSettings.java b/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
index da1fb73..29bbed8 100644
--- a/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
+++ b/java/src/com/android/inputmethod/latin/settings/DebugSettings.java
@@ -39,8 +39,6 @@
     public static final String PREF_STATISTICS_LOGGING = "enable_logging";
     public static final String PREF_USE_ONLY_PERSONALIZATION_DICTIONARY_FOR_DEBUG =
             "use_only_personalization_dictionary_for_debug";
-    public static final String PREF_BOOST_PERSONALIZATION_DICTIONARY_FOR_DEBUG =
-            "boost_personalization_dictionary_for_debug";
     private static final String PREF_READ_EXTERNAL_DICTIONARY = "read_external_dictionary";
     private static final boolean SHOW_STATISTICS_LOGGING = false;
 
@@ -112,8 +110,7 @@
                 updateDebugMode();
                 mServiceNeedsRestart = true;
             }
-        } else if (key.equals(PREF_FORCE_NON_DISTINCT_MULTITOUCH)
-                || key.equals(PREF_USE_ONLY_PERSONALIZATION_DICTIONARY_FOR_DEBUG)) {
+        } else if (key.equals(PREF_FORCE_NON_DISTINCT_MULTITOUCH)) {
             mServiceNeedsRestart = true;
         }
     }
diff --git a/java/src/com/android/inputmethod/latin/settings/Settings.java b/java/src/com/android/inputmethod/latin/settings/Settings.java
index df2c690..75c7258 100644
--- a/java/src/com/android/inputmethod/latin/settings/Settings.java
+++ b/java/src/com/android/inputmethod/latin/settings/Settings.java
@@ -27,12 +27,10 @@
 import com.android.inputmethod.latin.InputAttributes;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.utils.AdditionalSubtypeUtils;
-import com.android.inputmethod.latin.utils.LocaleUtils;
 import com.android.inputmethod.latin.utils.ResourceUtils;
 import com.android.inputmethod.latin.utils.RunInLocale;
 import com.android.inputmethod.latin.utils.StringUtils;
 
-import java.util.HashMap;
 import java.util.Locale;
 import java.util.concurrent.locks.ReentrantLock;
 
@@ -53,10 +51,9 @@
     public static final String PREF_AUTO_CORRECTION_THRESHOLD = "auto_correction_threshold";
     public static final String PREF_SHOW_SUGGESTIONS_SETTING = "show_suggestions_setting";
     public static final String PREF_MISC_SETTINGS = "misc_settings";
-    public static final String PREF_LAST_USER_DICTIONARY_WRITE_TIME =
-            "last_user_dictionary_write_time";
     public static final String PREF_ADVANCED_SETTINGS = "pref_advanced_settings";
     public static final String PREF_KEY_USE_CONTACTS_DICT = "pref_key_use_contacts_dict";
+    public static final String PREF_KEY_USE_PERSONALIZED_DICTS = "pref_key_use_personalized_dicts";
     public static final String PREF_KEY_USE_DOUBLE_SPACE_PERIOD =
             "pref_key_use_double_space_period";
     public static final String PREF_BLOCK_POTENTIALLY_OFFENSIVE =
@@ -104,6 +101,7 @@
     public static final String PREF_EMOJI_CATEGORY_LAST_TYPED_ID = "emoji_category_last_typed_id";
     public static final String PREF_LAST_SHOWN_EMOJI_CATEGORY_ID = "last_shown_emoji_category_id";
 
+    private Context mContext;
     private Resources mRes;
     private SharedPreferences mPrefs;
     private SettingsValues mSettingsValues;
@@ -124,6 +122,7 @@
     }
 
     private void onCreate(final Context context) {
+        mContext = context;
         mRes = context.getResources();
         mPrefs = PreferenceManager.getDefaultSharedPreferences(context);
         mPrefs.registerOnSharedPreferenceChangeListener(this);
@@ -143,20 +142,22 @@
                 Log.w(TAG, "onSharedPreferenceChanged called before loadSettings.");
                 return;
             }
-            loadSettings(mSettingsValues.mLocale, mSettingsValues.mInputAttributes);
+            loadSettings(mContext, mSettingsValues.mLocale, mSettingsValues.mInputAttributes);
         } finally {
             mSettingsValuesLock.unlock();
         }
     }
 
-    public void loadSettings(final Locale locale, final InputAttributes inputAttributes) {
+    public void loadSettings(final Context context, final Locale locale,
+            final InputAttributes inputAttributes) {
         mSettingsValuesLock.lock();
+        mContext = context;
         try {
             final SharedPreferences prefs = mPrefs;
             final RunInLocale<SettingsValues> job = new RunInLocale<SettingsValues>() {
                 @Override
                 protected SettingsValues job(final Resources res) {
-                    return new SettingsValues(prefs, locale, res, inputAttributes);
+                    return new SettingsValues(context, prefs, locale, res, inputAttributes);
                 }
             };
             mSettingsValues = job.runInLocale(mRes, locale);
@@ -229,16 +230,15 @@
                 res.getBoolean(R.bool.config_default_phrase_gesture_enabled));
     }
 
-    public static boolean readFromBuildConfigIfToShowKeyPreviewPopupSettingsOption(
-            final Resources res) {
-        return res.getBoolean(R.bool.config_enable_show_option_of_key_preview_popup);
+    public static boolean readFromBuildConfigIfToShowKeyPreviewPopupOption(final Resources res) {
+        return res.getBoolean(R.bool.config_enable_show_key_preview_popup_option);
     }
 
     public static boolean readKeyPreviewPopupEnabled(final SharedPreferences prefs,
             final Resources res) {
         final boolean defaultKeyPreviewPopup = res.getBoolean(
                 R.bool.config_default_key_preview_popup);
-        if (!readFromBuildConfigIfToShowKeyPreviewPopupSettingsOption(res)) {
+        if (!readFromBuildConfigIfToShowKeyPreviewPopupOption(res)) {
             return defaultKeyPreviewPopup;
         }
         return prefs.getBoolean(PREF_POPUP_ON, defaultKeyPreviewPopup);
@@ -333,25 +333,6 @@
         return prefs.getBoolean(DebugSettings.PREF_USABILITY_STUDY_MODE, true);
     }
 
-    public static long readLastUserHistoryWriteTime(final SharedPreferences prefs,
-            final String locale) {
-        final String str = prefs.getString(PREF_LAST_USER_DICTIONARY_WRITE_TIME, "");
-        final HashMap<String, Long> map = LocaleUtils.localeAndTimeStrToHashMap(str);
-        if (map.containsKey(locale)) {
-            return map.get(locale);
-        }
-        return 0;
-    }
-
-    public static void writeLastUserHistoryWriteTime(final SharedPreferences prefs,
-            final String locale) {
-        final String oldStr = prefs.getString(PREF_LAST_USER_DICTIONARY_WRITE_TIME, "");
-        final HashMap<String, Long> map = LocaleUtils.localeAndTimeStrToHashMap(oldStr);
-        map.put(locale, System.currentTimeMillis());
-        final String newStr = LocaleUtils.localeAndTimeHashMapToStr(map);
-        prefs.edit().putString(PREF_LAST_USER_DICTIONARY_WRITE_TIME, newStr).apply();
-    }
-
     public static boolean readUseFullscreenMode(final Resources res) {
         return res.getBoolean(R.bool.config_use_fullscreen_mode);
     }
@@ -377,21 +358,13 @@
         return prefs.getBoolean(Settings.PREF_KEY_IS_INTERNAL, false);
     }
 
-    public static boolean readUseOnlyPersonalizationDictionaryForDebug(
-            final SharedPreferences prefs) {
-        return prefs.getBoolean(
-                DebugSettings.PREF_USE_ONLY_PERSONALIZATION_DICTIONARY_FOR_DEBUG, false);
-    }
-
-    public static boolean readBoostPersonalizationDictionaryForDebug(
-            final SharedPreferences prefs) {
-        return prefs.getBoolean(
-                DebugSettings.PREF_BOOST_PERSONALIZATION_DICTIONARY_FOR_DEBUG, false);
-    }
-
     public void writeLastUsedPersonalizationToken(byte[] token) {
-        final String tokenStr = StringUtils.byteArrayToHexString(token);
-        mPrefs.edit().putString(PREF_LAST_USED_PERSONALIZATION_TOKEN, tokenStr).apply();
+        if (token == null) {
+            mPrefs.edit().remove(PREF_LAST_USED_PERSONALIZATION_TOKEN).apply();
+        } else {
+            final String tokenStr = StringUtils.byteArrayToHexString(token);
+            mPrefs.edit().putString(PREF_LAST_USED_PERSONALIZATION_TOKEN, tokenStr).apply();
+        }
     }
 
     public byte[] readLastUsedPersonalizationToken() {
diff --git a/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java b/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java
index 5c60a73..67017a4 100644
--- a/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java
+++ b/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java
@@ -48,7 +48,6 @@
 import com.android.inputmethod.latin.utils.ApplicationUtils;
 import com.android.inputmethod.latin.utils.FeedbackUtils;
 import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
-import com.android.inputmethod.research.ResearchLogger;
 import com.android.inputmethodcommon.InputMethodSettingsFragment;
 
 import java.util.TreeSet;
@@ -61,13 +60,6 @@
             DBG_USE_INTERNAL_PERSONAL_DICTIONARY_SETTINGS
                     || Build.VERSION.SDK_INT <= 18 /* Build.VERSION.JELLY_BEAN_MR2 */;
 
-    private CheckBoxPreference mVoiceInputKeyPreference;
-    private ListPreference mShowCorrectionSuggestionsPreference;
-    private ListPreference mAutoCorrectionThresholdPreference;
-    private ListPreference mKeyPreviewPopupDismissDelay;
-    // Use bigrams to predict the next word when there is no input for it yet
-    private CheckBoxPreference mBigramPrediction;
-
     private void setPreferenceEnabled(final String preferenceKey, final boolean enabled) {
         final Preference preference = findPreference(preferenceKey);
         if (preference != null) {
@@ -75,6 +67,18 @@
         }
     }
 
+    private void updateListPreferenceSummaryToCurrentValue(final String prefKey) {
+        // Because the "%s" summary trick of {@link ListPreference} doesn't work properly before
+        // KitKat, we need to update the summary programmatically.
+        final ListPreference listPreference = (ListPreference)findPreference(prefKey);
+        if (listPreference == null) {
+            return;
+        }
+        final CharSequence entries[] = listPreference.getEntries();
+        final int entryIndex = listPreference.findIndexOfValue(listPreference.getValue());
+        listPreference.setSummary(entryIndex < 0 ? null : entries[entryIndex]);
+    }
+
     private static void removePreference(final String preferenceKey, final PreferenceGroup parent) {
         if (parent == null) {
             return;
@@ -94,7 +98,7 @@
         final PreferenceScreen preferenceScreen = getPreferenceScreen();
         if (preferenceScreen != null) {
             preferenceScreen.setTitle(
-                    ApplicationUtils.getAcitivityTitleResId(getActivity(), SettingsActivity.class));
+                    ApplicationUtils.getActivityTitleResId(getActivity(), SettingsActivity.class));
         }
 
         final Resources res = getResources();
@@ -107,16 +111,9 @@
         SubtypeLocaleUtils.init(context);
         AudioAndHapticFeedbackManager.init(context);
 
-        mVoiceInputKeyPreference =
-                (CheckBoxPreference) findPreference(Settings.PREF_VOICE_INPUT_KEY);
-        mShowCorrectionSuggestionsPreference =
-                (ListPreference) findPreference(Settings.PREF_SHOW_SUGGESTIONS_SETTING);
         final SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
         prefs.registerOnSharedPreferenceChangeListener(this);
 
-        mAutoCorrectionThresholdPreference =
-                (ListPreference) findPreference(Settings.PREF_AUTO_CORRECTION_THRESHOLD);
-        mBigramPrediction = (CheckBoxPreference) findPreference(Settings.PREF_BIGRAM_PREDICTIONS);
         ensureConsistencyOfAutoCorrectionSettings();
 
         final PreferenceGroup generalSettings =
@@ -143,12 +140,7 @@
                 feedbackSettings.setOnPreferenceClickListener(new OnPreferenceClickListener() {
                     @Override
                     public boolean onPreferenceClick(final Preference pref) {
-                        if (ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS) {
-                            // Use development-only feedback mechanism
-                            ResearchLogger.getInstance().presentFeedbackDialogFromSettings();
-                        } else {
-                            FeedbackUtils.showFeedbackForm(getActivity());
-                        }
+                        FeedbackUtils.showFeedbackForm(getActivity());
                         return true;
                     }
                 });
@@ -167,7 +159,7 @@
         final boolean showVoiceKeyOption = res.getBoolean(
                 R.bool.config_enable_show_voice_key_option);
         if (!showVoiceKeyOption) {
-            generalSettings.removePreference(mVoiceInputKeyPreference);
+            removePreference(Settings.PREF_VOICE_INPUT_KEY, generalSettings);
         }
 
         final PreferenceGroup advancedSettings =
@@ -177,26 +169,27 @@
             removePreference(Settings.PREF_VIBRATION_DURATION_SETTINGS, advancedSettings);
         }
 
-        mKeyPreviewPopupDismissDelay =
-                (ListPreference) findPreference(Settings.PREF_KEY_PREVIEW_POPUP_DISMISS_DELAY);
-        if (!Settings.readFromBuildConfigIfToShowKeyPreviewPopupSettingsOption(res)) {
+        if (!Settings.readFromBuildConfigIfToShowKeyPreviewPopupOption(res)) {
             removePreference(Settings.PREF_POPUP_ON, generalSettings);
             removePreference(Settings.PREF_KEY_PREVIEW_POPUP_DISMISS_DELAY, advancedSettings);
         } else {
+            // TODO: Cleanup this setup.
+            final ListPreference keyPreviewPopupDismissDelay =
+                    (ListPreference) findPreference(Settings.PREF_KEY_PREVIEW_POPUP_DISMISS_DELAY);
             final String popupDismissDelayDefaultValue = Integer.toString(res.getInteger(
                     R.integer.config_key_preview_linger_timeout));
-            mKeyPreviewPopupDismissDelay.setEntries(new String[] {
+            keyPreviewPopupDismissDelay.setEntries(new String[] {
                     res.getString(R.string.key_preview_popup_dismiss_no_delay),
                     res.getString(R.string.key_preview_popup_dismiss_default_delay),
             });
-            mKeyPreviewPopupDismissDelay.setEntryValues(new String[] {
+            keyPreviewPopupDismissDelay.setEntryValues(new String[] {
                     "0",
                     popupDismissDelayDefaultValue
             });
-            if (null == mKeyPreviewPopupDismissDelay.getValue()) {
-                mKeyPreviewPopupDismissDelay.setValue(popupDismissDelayDefaultValue);
+            if (null == keyPreviewPopupDismissDelay.getValue()) {
+                keyPreviewPopupDismissDelay.setValue(popupDismissDelayDefaultValue);
             }
-            mKeyPreviewPopupDismissDelay.setEnabled(
+            keyPreviewPopupDismissDelay.setEnabled(
                     Settings.readKeyPreviewPopupEnabled(prefs, res));
         }
 
@@ -243,20 +236,25 @@
     @Override
     public void onResume() {
         super.onResume();
-        final boolean isShortcutImeEnabled = SubtypeSwitcher.getInstance().isShortcutImeEnabled();
-        if (!isShortcutImeEnabled) {
-            getPreferenceScreen().removePreference(mVoiceInputKeyPreference);
-        }
         final SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
+        final Resources res = getResources();
+        final Preference voiceInputKeyOption = findPreference(Settings.PREF_VOICE_INPUT_KEY);
+        if (voiceInputKeyOption != null) {
+            final boolean isShortcutImeEnabled = SubtypeSwitcher.getInstance()
+                    .isShortcutImeEnabled();
+            voiceInputKeyOption.setEnabled(isShortcutImeEnabled);
+            voiceInputKeyOption.setSummary(isShortcutImeEnabled ? null
+                    : res.getText(R.string.voice_input_disabled_summary));
+        }
         final CheckBoxPreference showSetupWizardIcon =
                 (CheckBoxPreference)findPreference(Settings.PREF_SHOW_SETUP_WIZARD_ICON);
         if (showSetupWizardIcon != null) {
             showSetupWizardIcon.setChecked(Settings.readShowSetupWizardIcon(prefs, getActivity()));
         }
-        updateShowCorrectionSuggestionsSummary();
-        updateKeyPreviewPopupDelaySummary();
-        updateColorSchemeSummary(prefs, getResources());
-        updateCustomInputStylesSummary();
+        updateListPreferenceSummaryToCurrentValue(Settings.PREF_SHOW_SUGGESTIONS_SETTING);
+        updateListPreferenceSummaryToCurrentValue(Settings.PREF_KEY_PREVIEW_POPUP_DISMISS_DELAY);
+        updateListPreferenceSummaryToCurrentValue(Settings.PREF_KEYBOARD_LAYOUT);
+        updateCustomInputStylesSummary(prefs, res);
     }
 
     @Override
@@ -287,50 +285,26 @@
             LauncherIconVisibilityManager.updateSetupWizardIconVisibility(getActivity());
         }
         ensureConsistencyOfAutoCorrectionSettings();
-        updateShowCorrectionSuggestionsSummary();
-        updateKeyPreviewPopupDelaySummary();
-        updateColorSchemeSummary(prefs, res);
+        updateListPreferenceSummaryToCurrentValue(Settings.PREF_SHOW_SUGGESTIONS_SETTING);
+        updateListPreferenceSummaryToCurrentValue(Settings.PREF_KEY_PREVIEW_POPUP_DISMISS_DELAY);
+        updateListPreferenceSummaryToCurrentValue(Settings.PREF_KEYBOARD_LAYOUT);
         refreshEnablingsOfKeypressSoundAndVibrationSettings(prefs, getResources());
     }
 
     private void ensureConsistencyOfAutoCorrectionSettings() {
         final String autoCorrectionOff = getResources().getString(
                 R.string.auto_correction_threshold_mode_index_off);
-        final String currentSetting = mAutoCorrectionThresholdPreference.getValue();
-        mBigramPrediction.setEnabled(!currentSetting.equals(autoCorrectionOff));
+        final ListPreference autoCorrectionThresholdPref = (ListPreference)findPreference(
+                Settings.PREF_AUTO_CORRECTION_THRESHOLD);
+        final String currentSetting = autoCorrectionThresholdPref.getValue();
+        setPreferenceEnabled(
+                Settings.PREF_BIGRAM_PREDICTIONS, !currentSetting.equals(autoCorrectionOff));
     }
 
-    private void updateShowCorrectionSuggestionsSummary() {
-        mShowCorrectionSuggestionsPreference.setSummary(
-                getResources().getStringArray(R.array.prefs_suggestion_visibilities)
-                [mShowCorrectionSuggestionsPreference.findIndexOfValue(
-                        mShowCorrectionSuggestionsPreference.getValue())]);
-    }
-
-    private void updateColorSchemeSummary(final SharedPreferences prefs, final Resources res) {
-        // Because the "%s" summary trick of {@link ListPreference} doesn't work properly before
-        // KitKat, we need to update the summary by code.
-        final Preference preference = findPreference(Settings.PREF_KEYBOARD_LAYOUT);
-        if (!(preference instanceof ListPreference)) {
-            Log.w(TAG, "Can't find Keyboard Color Scheme preference");
-            return;
-        }
-        final ListPreference colorSchemePreference = (ListPreference)preference;
-        final int themeIndex = Settings.readKeyboardThemeIndex(prefs, res);
-        int entryIndex = colorSchemePreference.findIndexOfValue(Integer.toString(themeIndex));
-        if (entryIndex < 0) {
-            final int defaultThemeIndex = Settings.resetAndGetDefaultKeyboardThemeIndex(prefs, res);
-            entryIndex = colorSchemePreference.findIndexOfValue(
-                    Integer.toString(defaultThemeIndex));
-        }
-        colorSchemePreference.setSummary(colorSchemePreference.getEntries()[entryIndex]);
-    }
-
-    private void updateCustomInputStylesSummary() {
+    private void updateCustomInputStylesSummary(final SharedPreferences prefs,
+            final Resources res) {
         final PreferenceScreen customInputStyles =
                 (PreferenceScreen)findPreference(Settings.PREF_CUSTOM_INPUT_STYLES);
-        final SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
-        final Resources res = getResources();
         final String prefSubtype = Settings.readPrefAdditionalSubtypes(prefs, res);
         final InputMethodSubtype[] subtypes =
                 AdditionalSubtypeUtils.createAdditionalSubtypesArray(prefSubtype);
@@ -342,13 +316,6 @@
         customInputStyles.setSummary(styles);
     }
 
-    private void updateKeyPreviewPopupDelaySummary() {
-        final ListPreference lp = mKeyPreviewPopupDismissDelay;
-        final CharSequence[] entries = lp.getEntries();
-        if (entries == null || entries.length <= 0) return;
-        lp.setSummary(entries[lp.findIndexOfValue(lp.getValue())]);
-    }
-
     private void refreshEnablingsOfKeypressSoundAndVibrationSettings(
             final SharedPreferences sp, final Resources res) {
         setPreferenceEnabled(Settings.PREF_VIBRATION_DURATION_SETTINGS,
diff --git a/java/src/com/android/inputmethod/latin/settings/SettingsValues.java b/java/src/com/android/inputmethod/latin/settings/SettingsValues.java
index f331c78..a07a0ce 100644
--- a/java/src/com/android/inputmethod/latin/settings/SettingsValues.java
+++ b/java/src/com/android/inputmethod/latin/settings/SettingsValues.java
@@ -16,25 +16,28 @@
 
 package com.android.inputmethod.latin.settings;
 
+import android.content.Context;
 import android.content.SharedPreferences;
+import android.content.pm.PackageInfo;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.util.Log;
 import android.view.inputmethod.EditorInfo;
 
 import com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.compat.AppWorkaroundsUtils;
 import com.android.inputmethod.keyboard.internal.KeySpecParser;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.InputAttributes;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.RichInputMethodManager;
-import com.android.inputmethod.latin.SubtypeSwitcher;
 import com.android.inputmethod.latin.SuggestedWords;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+import com.android.inputmethod.latin.utils.AsyncResultHolder;
 import com.android.inputmethod.latin.utils.CollectionUtils;
-import com.android.inputmethod.latin.utils.InputTypeUtils;
 import com.android.inputmethod.latin.utils.StringUtils;
+import com.android.inputmethod.latin.utils.TargetPackageInfoGetterTask;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -50,6 +53,7 @@
     // Float.NEGATIVE_INFINITE and Float.MAX_VALUE. Currently used for auto-correction settings.
     private static final String FLOAT_MAX_VALUE_MARKER_STRING = "floatMaxValue";
     private static final String FLOAT_NEGATIVE_INFINITY_MARKER_STRING = "floatNegativeInfinity";
+    private static final int TIMEOUT_TO_GET_TARGET_PACKAGE = 5; // seconds
 
     // From resources:
     public final int mDelayUpdateOldSuggestions;
@@ -67,10 +71,11 @@
     public final boolean mVibrateOn;
     public final boolean mSoundOn;
     public final boolean mKeyPreviewPopupOn;
-    private final boolean mShowsVoiceInputKey;
+    public final boolean mShowsVoiceInputKey;
     public final boolean mIncludesOtherImesInLanguageSwitchList;
     public final boolean mShowsLanguageSwitchKey;
     public final boolean mUseContactsDict;
+    public final boolean mUsePersonalizedDicts;
     public final boolean mUseDoubleSpacePeriod;
     public final boolean mBlockPotentiallyOffensive;
     // Use bigrams to predict the next word when there is no input for it yet
@@ -94,8 +99,9 @@
     public final float mAutoCorrectionThreshold;
     public final boolean mCorrectionEnabled;
     public final int mSuggestionVisibility;
-    public final boolean mBoostPersonalizationDictionaryForDebug;
     public final boolean mUseOnlyPersonalizationDictionaryForDebug;
+    public final int mDisplayOrientation;
+    private final AsyncResultHolder<AppWorkaroundsUtils> mAppWorkarounds;
 
     // Setting values for additional features
     public final int[] mAdditionalFeaturesSettingValues =
@@ -104,8 +110,8 @@
     // Debug settings
     public final boolean mIsInternal;
 
-    public SettingsValues(final SharedPreferences prefs, final Locale locale, final Resources res,
-            final InputAttributes inputAttributes) {
+    public SettingsValues(final Context context, final SharedPreferences prefs, final Locale locale,
+            final Resources res, final InputAttributes inputAttributes) {
         mLocale = locale;
         // Get the resources
         mDelayUpdateOldSuggestions = res.getInteger(R.integer.config_delay_update_old_suggestions);
@@ -148,6 +154,7 @@
                 Settings.PREF_INCLUDE_OTHER_IMES_IN_LANGUAGE_SWITCH_LIST, false);
         mShowsLanguageSwitchKey = Settings.readShowsLanguageSwitchKey(prefs);
         mUseContactsDict = prefs.getBoolean(Settings.PREF_KEY_USE_CONTACTS_DICT, true);
+        mUsePersonalizedDicts = prefs.getBoolean(Settings.PREF_KEY_USE_PERSONALIZED_DICTS, true);
         mUseDoubleSpacePeriod = prefs.getBoolean(Settings.PREF_KEY_USE_DOUBLE_SPACE_PERIOD, true);
         mBlockPotentiallyOffensive = Settings.readBlockPotentiallyOffensive(prefs, res);
         mAutoCorrectEnabled = Settings.readAutoCorrectEnabled(autoCorrectionThresholdRawValue, res);
@@ -173,10 +180,18 @@
         AdditionalFeaturesSettingUtils.readAdditionalFeaturesPreferencesIntoArray(
                 prefs, mAdditionalFeaturesSettingValues);
         mIsInternal = Settings.isInternal(prefs);
-        mBoostPersonalizationDictionaryForDebug =
-                Settings.readBoostPersonalizationDictionaryForDebug(prefs);
-        mUseOnlyPersonalizationDictionaryForDebug =
-                Settings.readUseOnlyPersonalizationDictionaryForDebug(prefs);
+        mUseOnlyPersonalizationDictionaryForDebug = prefs.getBoolean(
+                DebugSettings.PREF_USE_ONLY_PERSONALIZATION_DICTIONARY_FOR_DEBUG, false);
+        mDisplayOrientation = res.getConfiguration().orientation;
+        mAppWorkarounds = new AsyncResultHolder<AppWorkaroundsUtils>();
+        final PackageInfo packageInfo = TargetPackageInfoGetterTask.getCachedPackageInfo(
+                mInputAttributes.mTargetApplicationPackageName);
+        if (null != packageInfo) {
+            mAppWorkarounds.set(new AppWorkaroundsUtils(packageInfo));
+        } else {
+            new TargetPackageInfoGetterTask(context, mAppWorkarounds)
+                    .execute(mInputAttributes.mTargetApplicationPackageName);
+        }
     }
 
     // Only for tests
@@ -206,6 +221,7 @@
         mIncludesOtherImesInLanguageSwitchList = false;
         mShowsLanguageSwitchKey = true;
         mUseContactsDict = true;
+        mUsePersonalizedDicts = true;
         mUseDoubleSpacePeriod = true;
         mBlockPotentiallyOffensive = true;
         mAutoCorrectEnabled = true;
@@ -222,8 +238,10 @@
         mCorrectionEnabled = mAutoCorrectEnabled && !mInputAttributes.mInputTypeNoAutoCorrect;
         mSuggestionVisibility = 0;
         mIsInternal = false;
-        mBoostPersonalizationDictionaryForDebug = false;
         mUseOnlyPersonalizationDictionaryForDebug = false;
+        mDisplayOrientation = Configuration.ORIENTATION_PORTRAIT;
+        mAppWorkarounds = new AsyncResultHolder<AppWorkaroundsUtils>();
+        mAppWorkarounds.set(null);
     }
 
     @UsedForTesting
@@ -235,16 +253,15 @@
         return mInputAttributes.mApplicationSpecifiedCompletionOn;
     }
 
-    public boolean isSuggestionsRequested(final int displayOrientation) {
+    public boolean isSuggestionsRequested() {
         return mInputAttributes.mIsSettingsSuggestionStripOn
-                && (mCorrectionEnabled
-                        || isSuggestionStripVisibleInOrientation(displayOrientation));
+                && (mCorrectionEnabled || isSuggestionStripVisible());
     }
 
-    public boolean isSuggestionStripVisibleInOrientation(final int orientation) {
+    public boolean isSuggestionStripVisible() {
         return (mSuggestionVisibility == SUGGESTION_VISIBILITY_SHOW_VALUE)
                 || (mSuggestionVisibility == SUGGESTION_VISIBILITY_SHOW_ONLY_PORTRAIT_VALUE
-                        && orientation == Configuration.ORIENTATION_PORTRAIT);
+                        && mDisplayOrientation == Configuration.ORIENTATION_PORTRAIT);
     }
 
     public boolean isWordSeparator(final int code) {
@@ -271,13 +288,6 @@
         return mInputAttributes.mShouldInsertSpacesAutomatically;
     }
 
-    public boolean isVoiceKeyEnabled(final EditorInfo editorInfo) {
-        final boolean shortcutImeEnabled = SubtypeSwitcher.getInstance().isShortcutImeEnabled();
-        final int inputType = (editorInfo != null) ? editorInfo.inputType : 0;
-        return shortcutImeEnabled && mShowsVoiceInputKey
-                && !InputTypeUtils.isPasswordInputType(inputType);
-    }
-
     public boolean isLanguageSwitchKeyEnabled() {
         if (!mShowsLanguageSwitchKey) {
             return false;
@@ -294,6 +304,22 @@
         return mInputAttributes.isSameInputType(editorInfo);
     }
 
+    public boolean hasSameOrientation(final Configuration configuration) {
+        return mDisplayOrientation == configuration.orientation;
+    }
+
+    public boolean isBeforeJellyBean() {
+        final AppWorkaroundsUtils appWorkaroundUtils
+                = mAppWorkarounds.get(null, TIMEOUT_TO_GET_TARGET_PACKAGE);
+        return null == appWorkaroundUtils ? false : appWorkaroundUtils.isBeforeJellyBean();
+    }
+
+    public boolean isBrokenByRecorrection() {
+        final AppWorkaroundsUtils appWorkaroundUtils
+                = mAppWorkarounds.get(null, TIMEOUT_TO_GET_TARGET_PACKAGE);
+        return null == appWorkaroundUtils ? false : appWorkaroundUtils.isBrokenByRecorrection();
+    }
+
     // Helper functions to create member values.
     private static SuggestedWords createSuggestPuncList(final String[] puncs) {
         final ArrayList<SuggestedWordInfo> puncList = CollectionUtils.newArrayList();
@@ -374,16 +400,20 @@
         return autoCorrectionThreshold;
     }
 
-    private static boolean needsToShowVoiceInputKey(SharedPreferences prefs, Resources res) {
-        final String voiceModeMain = res.getString(R.string.voice_mode_main);
-        final String voiceMode = prefs.getString(Settings.PREF_VOICE_MODE_OBSOLETE, voiceModeMain);
-        final boolean showsVoiceInputKey = voiceMode == null || voiceMode.equals(voiceModeMain);
-        if (!showsVoiceInputKey) {
-            // Migrate settings from PREF_VOICE_MODE_OBSOLETE to PREF_VOICE_INPUT_KEY
-            // Set voiceModeMain as a value of obsolete voice mode settings.
-            prefs.edit().putString(Settings.PREF_VOICE_MODE_OBSOLETE, voiceModeMain).apply();
-            // Disable voice input key.
-            prefs.edit().putBoolean(Settings.PREF_VOICE_INPUT_KEY, false).apply();
+    private static boolean needsToShowVoiceInputKey(final SharedPreferences prefs,
+            final Resources res) {
+        if (!prefs.contains(Settings.PREF_VOICE_INPUT_KEY)) {
+            // Migrate preference from {@link Settings#PREF_VOICE_MODE_OBSOLETE} to
+            // {@link Settings#PREF_VOICE_INPUT_KEY}.
+            final String voiceModeMain = res.getString(R.string.voice_mode_main);
+            final String voiceMode = prefs.getString(
+                    Settings.PREF_VOICE_MODE_OBSOLETE, voiceModeMain);
+            final boolean shouldShowVoiceInputKey = voiceModeMain.equals(voiceMode);
+            prefs.edit().putBoolean(Settings.PREF_VOICE_INPUT_KEY, shouldShowVoiceInputKey).apply();
+        }
+        // Remove the obsolete preference if exists.
+        if (prefs.contains(Settings.PREF_VOICE_MODE_OBSOLETE)) {
+            prefs.edit().remove(Settings.PREF_VOICE_MODE_OBSOLETE).apply();
         }
         return prefs.getBoolean(Settings.PREF_VOICE_INPUT_KEY, true);
     }
diff --git a/java/src/com/android/inputmethod/latin/setup/SetupWizardActivity.java b/java/src/com/android/inputmethod/latin/setup/SetupWizardActivity.java
index c4a813c..5072fab 100644
--- a/java/src/com/android/inputmethod/latin/setup/SetupWizardActivity.java
+++ b/java/src/com/android/inputmethod/latin/setup/SetupWizardActivity.java
@@ -38,7 +38,7 @@
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.settings.SettingsActivity;
 import com.android.inputmethod.latin.utils.CollectionUtils;
-import com.android.inputmethod.latin.utils.StaticInnerHandlerWrapper;
+import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
 
 import java.util.ArrayList;
 
@@ -74,21 +74,21 @@
     private SettingsPoolingHandler mHandler;
 
     private static final class SettingsPoolingHandler
-            extends StaticInnerHandlerWrapper<SetupWizardActivity> {
+            extends LeakGuardHandlerWrapper<SetupWizardActivity> {
         private static final int MSG_POLLING_IME_SETTINGS = 0;
         private static final long IME_SETTINGS_POLLING_INTERVAL = 200;
 
         private final InputMethodManager mImmInHandler;
 
-        public SettingsPoolingHandler(final SetupWizardActivity outerInstance,
+        public SettingsPoolingHandler(final SetupWizardActivity ownerInstance,
                 final InputMethodManager imm) {
-            super(outerInstance);
+            super(ownerInstance);
             mImmInHandler = imm;
         }
 
         @Override
         public void handleMessage(final Message msg) {
-            final SetupWizardActivity setupWizardActivity = getOuterInstance();
+            final SetupWizardActivity setupWizardActivity = getOwnerInstance();
             if (setupWizardActivity == null) {
                 return;
             }
diff --git a/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java b/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
index 503b18b..dae36f7 100644
--- a/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
+++ b/java/src/com/android/inputmethod/latin/spellcheck/AndroidSpellCheckerService.java
@@ -383,6 +383,8 @@
         new Thread("spellchecker_close_dicts") {
             @Override
             public void run() {
+                // Contacts dictionary can be closed multiple times here. If the dictionary is
+                // already closed, extra closings are no-ops, so it's safe.
                 for (DictionaryPool pool : oldPools.values()) {
                     pool.close();
                 }
@@ -428,7 +430,7 @@
         final String localeStr = locale.toString();
         UserBinaryDictionary userDictionary = mUserDictionaries.get(localeStr);
         if (null == userDictionary) {
-            userDictionary = new SynchronouslyLoadedUserBinaryDictionary(this, localeStr, true);
+            userDictionary = new SynchronouslyLoadedUserBinaryDictionary(this, locale, true);
             mUserDictionaries.put(localeStr, userDictionary);
         }
         dictionaryCollection.addDictionary(userDictionary);
diff --git a/java/src/com/android/inputmethod/latin/spellcheck/DictionaryPool.java b/java/src/com/android/inputmethod/latin/spellcheck/DictionaryPool.java
index a0aed28..b7a5a40 100644
--- a/java/src/com/android/inputmethod/latin/spellcheck/DictionaryPool.java
+++ b/java/src/com/android/inputmethod/latin/spellcheck/DictionaryPool.java
@@ -49,6 +49,7 @@
     final static ArrayList<SuggestedWordInfo> noSuggestions = CollectionUtils.newArrayList();
     private final static DictAndKeyboard dummyDict = new DictAndKeyboard(
             new Dictionary(Dictionary.TYPE_MAIN) {
+                // TODO: this dummy dictionary should be a singleton in the Dictionary class.
                 @Override
                 public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
                         final String prevWord, final ProximityInfo proximityInfo,
diff --git a/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerSettingsFragment.java b/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerSettingsFragment.java
index 999ca77..186dafd 100644
--- a/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerSettingsFragment.java
+++ b/java/src/com/android/inputmethod/latin/spellcheck/SpellCheckerSettingsFragment.java
@@ -39,7 +39,7 @@
         addPreferencesFromResource(R.xml.spell_checker_settings);
         final PreferenceScreen preferenceScreen = getPreferenceScreen();
         if (preferenceScreen != null) {
-            preferenceScreen.setTitle(ApplicationUtils.getAcitivityTitleResId(
+            preferenceScreen.setTitle(ApplicationUtils.getActivityTitleResId(
                     getActivity(), SpellCheckerSettingsActivity.class));
         }
     }
diff --git a/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestions.java b/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestions.java
index acd4745..52012c8 100644
--- a/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestions.java
+++ b/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestions.java
@@ -66,7 +66,8 @@
             clearKeys();
             mDivider = res.getDrawable(R.drawable.more_suggestions_divider);
             mDividerWidth = mDivider.getIntrinsicWidth();
-            final float padding = res.getDimension(R.dimen.more_suggestions_key_horizontal_padding);
+            final float padding = res.getDimension(
+                    R.dimen.config_more_suggestions_key_horizontal_padding);
 
             int row = 0;
             int index = fromIndex;
@@ -75,7 +76,7 @@
             while (index < size) {
                 final String word = suggestedWords.getWord(index);
                 // TODO: Should take care of text x-scaling.
-                mWidths[index] = (int)(TypefaceUtils.getLabelWidth(word, paint) + padding);
+                mWidths[index] = (int)(TypefaceUtils.getStringWidth(word, paint) + padding);
                 final int numColumn = index - rowStartIndex + 1;
                 final int columnWidth =
                         (maxWidth - mDividerWidth * (numColumn - 1)) / numColumn;
diff --git a/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestionsView.java b/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestionsView.java
index 0ebe377..549ff0d 100644
--- a/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestionsView.java
+++ b/java/src/com/android/inputmethod/latin/suggestions/MoreSuggestionsView.java
@@ -54,7 +54,7 @@
 
     public void adjustVerticalCorrectionForModalMode() {
         // Set vertical correction to zero (Reset more keys keyboard sliding allowance
-        // {@link R#dimen.more_keys_keyboard_slide_allowance}).
+        // {@link R#dimen.config_more_keys_keyboard_slide_allowance}).
         mKeyDetector.setKeyboard(getKeyboard(), -getPaddingLeft(), -getPaddingTop());
     }
 
diff --git a/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripLayoutHelper.java b/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripLayoutHelper.java
index faa5560..f836e61 100644
--- a/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripLayoutHelper.java
+++ b/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripLayoutHelper.java
@@ -119,7 +119,8 @@
         mDividerWidth = dividerView.getMeasuredWidth();
 
         final Resources res = wordView.getResources();
-        mSuggestionsStripHeight = res.getDimensionPixelSize(R.dimen.suggestions_strip_height);
+        mSuggestionsStripHeight = res.getDimensionPixelSize(
+                R.dimen.config_suggestions_strip_height);
 
         final TypedArray a = context.obtainStyledAttributes(attrs,
                 R.styleable.SuggestionStripView, defStyle, R.style.SuggestionStripView);
@@ -145,15 +146,17 @@
         a.recycle();
 
         mMoreSuggestionsHint = getMoreSuggestionsHint(res,
-                res.getDimension(R.dimen.more_suggestions_hint_text_size), mColorAutoCorrect);
+                res.getDimension(R.dimen.config_more_suggestions_hint_text_size),
+                mColorAutoCorrect);
         mCenterPositionInStrip = mSuggestionsCountInStrip / 2;
         // Assuming there are at least three suggestions. Also, note that the suggestions are
         // laid out according to script direction, so this is left of the center for LTR scripts
         // and right of the center for RTL scripts.
         mTypedWordPositionWhenAutocorrect = mCenterPositionInStrip - 1;
         mMoreSuggestionsBottomGap = res.getDimensionPixelOffset(
-                R.dimen.more_suggestions_bottom_gap);
-        mMoreSuggestionsRowHeight = res.getDimensionPixelSize(R.dimen.more_suggestions_row_height);
+                R.dimen.config_more_suggestions_bottom_gap);
+        mMoreSuggestionsRowHeight = res.getDimensionPixelSize(
+                R.dimen.config_more_suggestions_row_height);
 
         final LayoutInflater inflater = LayoutInflater.from(context);
         mWordToSaveView = (TextView)inflater.inflate(R.layout.suggestion_word, null);
@@ -205,7 +208,7 @@
         }
         final String word = suggestedWords.getWord(indexInSuggestedWords);
         final boolean isAutoCorrect = indexInSuggestedWords == 1
-                && suggestedWords.willAutoCorrect();
+                && suggestedWords.mWillAutoCorrect;
         final boolean isTypedWordValid = indexInSuggestedWords == 0
                 && suggestedWords.mTypedWordValid;
         if (!isAutoCorrect && !isTypedWordValid) {
@@ -229,7 +232,7 @@
             final SuggestedWords suggestedWords) {
         final int indexToDisplayMostImportantSuggestion;
         final int indexToDisplaySecondMostImportantSuggestion;
-        if (suggestedWords.willAutoCorrect()) {
+        if (suggestedWords.mWillAutoCorrect) {
             indexToDisplayMostImportantSuggestion = SuggestedWords.INDEX_OF_AUTO_CORRECTION;
             indexToDisplaySecondMostImportantSuggestion = SuggestedWords.INDEX_OF_TYPED_WORD;
         } else {
@@ -254,7 +257,7 @@
         final boolean isSuggested = (indexInSuggestedWords != SuggestedWords.INDEX_OF_TYPED_WORD);
 
         final int color;
-        if (positionInStrip == mCenterPositionInStrip && suggestedWords.willAutoCorrect()) {
+        if (positionInStrip == mCenterPositionInStrip && suggestedWords.mWillAutoCorrect) {
             color = mColorAutoCorrect;
         } else if (positionInStrip == mCenterPositionInStrip && suggestedWords.mTypedWordValid) {
             color = mColorValidTypedWord;
diff --git a/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripView.java b/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripView.java
index 75f17c5..073148a 100644
--- a/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripView.java
+++ b/java/src/com/android/inputmethod/latin/suggestions/SuggestionStripView.java
@@ -112,7 +112,7 @@
 
         final Resources res = context.getResources();
         mMoreSuggestionsModalTolerance = res.getDimensionPixelOffset(
-                R.dimen.more_suggestions_modal_tolerance);
+                R.dimen.config_more_suggestions_modal_tolerance);
         mMoreSuggestionsSlidingDetector = new GestureDetector(
                 context, mMoreSuggestionsSlidingListener);
     }
@@ -162,19 +162,19 @@
         mSuggestionsStrip.removeAllViews();
         removeAllViews();
         addView(mSuggestionsStrip);
-        mMoreSuggestionsView.dismissMoreKeysPanel();
+        dismissMoreSuggestionsPanel();
     }
 
     private final MoreSuggestionsListener mMoreSuggestionsListener = new MoreSuggestionsListener() {
         @Override
         public void onSuggestionSelected(final int index, final SuggestedWordInfo wordInfo) {
             mListener.pickSuggestionManually(index, wordInfo);
-            mMoreSuggestionsView.dismissMoreKeysPanel();
+            dismissMoreSuggestionsPanel();
         }
 
         @Override
         public void onCancelInput() {
-            mMoreSuggestionsView.dismissMoreKeysPanel();
+            dismissMoreSuggestionsPanel();
         }
     };
 
@@ -192,10 +192,18 @@
 
         @Override
         public void onCancelMoreKeysPanel(final MoreKeysPanel panel) {
-            mMoreSuggestionsView.dismissMoreKeysPanel();
+            dismissMoreSuggestionsPanel();
         }
     };
 
+    public boolean isShowingMoreSuggestionPanel() {
+        return mMoreSuggestionsView.isShowingInParent();
+    }
+
+    public void dismissMoreSuggestionsPanel() {
+        mMoreSuggestionsView.dismissMoreKeysPanel();
+    }
+
     @Override
     public boolean onLongClick(final View view) {
         AudioAndHapticFeedbackManager.getInstance().performHapticAndAudioFeedback(
@@ -322,6 +330,6 @@
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
-        mMoreSuggestionsView.dismissMoreKeysPanel();
+        dismissMoreSuggestionsPanel();
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/AdditionalSubtypeUtils.java b/java/src/com/android/inputmethod/latin/utils/AdditionalSubtypeUtils.java
index d87f6f3..ef1d0f4 100644
--- a/java/src/com/android/inputmethod/latin/utils/AdditionalSubtypeUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/AdditionalSubtypeUtils.java
@@ -17,21 +17,25 @@
 package com.android.inputmethod.latin.utils;
 
 import static com.android.inputmethod.latin.Constants.Subtype.KEYBOARD_MODE;
+import static com.android.inputmethod.latin.Constants.Subtype.ExtraValue.EMOJI_CAPABLE;
 import static com.android.inputmethod.latin.Constants.Subtype.ExtraValue.IS_ADDITIONAL_SUBTYPE;
 import static com.android.inputmethod.latin.Constants.Subtype.ExtraValue.KEYBOARD_LAYOUT_SET;
 import static com.android.inputmethod.latin.Constants.Subtype.ExtraValue.UNTRANSLATABLE_STRING_IN_SUBTYPE_NAME;
 
 import android.os.Build;
 import android.text.TextUtils;
+import android.util.Log;
 import android.view.inputmethod.InputMethodSubtype;
 
 import com.android.inputmethod.compat.InputMethodSubtypeCompatUtils;
-import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.R;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 
 public final class AdditionalSubtypeUtils {
+    private static final String TAG = AdditionalSubtypeUtils.class.getSimpleName();
+
     private static final InputMethodSubtype[] EMPTY_SUBTYPE_ARRAY = new InputMethodSubtype[0];
 
     private AdditionalSubtypeUtils() {
@@ -43,6 +47,11 @@
     }
 
     private static final String LOCALE_AND_LAYOUT_SEPARATOR = ":";
+    private static final int INDEX_OF_LOCALE = 0;
+    private static final int INDEX_OF_KEYBOARD_LAYOUT = 1;
+    private static final int INDEX_OF_EXTRA_VALUE = 2;
+    private static final int LENGTH_WITHOUT_EXTRA_VALUE = (INDEX_OF_KEYBOARD_LAYOUT + 1);
+    private static final int LENGTH_WITH_EXTRA_VALUE = (INDEX_OF_EXTRA_VALUE + 1);
     private static final String PREF_SUBTYPE_SEPARATOR = ";";
 
     public static InputMethodSubtype createAdditionalSubtype(final String localeString,
@@ -79,17 +88,6 @@
                 : basePrefSubtype + LOCALE_AND_LAYOUT_SEPARATOR + extraValue;
     }
 
-    public static InputMethodSubtype createAdditionalSubtype(final String prefSubtype) {
-        final String elems[] = prefSubtype.split(LOCALE_AND_LAYOUT_SEPARATOR);
-        if (elems.length < 2 || elems.length > 3) {
-            throw new RuntimeException("Unknown additional subtype specified: " + prefSubtype);
-        }
-        final String localeString = elems[0];
-        final String keyboardLayoutSetName = elems[1];
-        final String extraValue = (elems.length == 3) ? elems[2] : null;
-        return createAdditionalSubtype(localeString, keyboardLayoutSetName, extraValue);
-    }
-
     public static InputMethodSubtype[] createAdditionalSubtypesArray(final String prefSubtypes) {
         if (TextUtils.isEmpty(prefSubtypes)) {
             return EMPTY_SUBTYPE_ARRAY;
@@ -98,7 +96,19 @@
         final ArrayList<InputMethodSubtype> subtypesList =
                 CollectionUtils.newArrayList(prefSubtypeArray.length);
         for (final String prefSubtype : prefSubtypeArray) {
-            final InputMethodSubtype subtype = createAdditionalSubtype(prefSubtype);
+            final String elems[] = prefSubtype.split(LOCALE_AND_LAYOUT_SEPARATOR);
+            if (elems.length != LENGTH_WITHOUT_EXTRA_VALUE
+                    && elems.length != LENGTH_WITH_EXTRA_VALUE) {
+                Log.w(TAG, "Unknown additional subtype specified: " + prefSubtype + " in "
+                        + prefSubtypes);
+                continue;
+            }
+            final String localeString = elems[INDEX_OF_LOCALE];
+            final String keyboardLayoutSetName = elems[INDEX_OF_KEYBOARD_LAYOUT];
+            final String extraValue = (elems.length == LENGTH_WITH_EXTRA_VALUE)
+                    ? elems[INDEX_OF_EXTRA_VALUE] : null;
+            final InputMethodSubtype subtype = createAdditionalSubtype(
+                    localeString, keyboardLayoutSetName, extraValue);
             if (subtype.getNameResId() == SubtypeLocaleUtils.UNKNOWN_KEYBOARD_LAYOUT) {
                 // Skip unknown keyboard layout subtype. This may happen when predefined keyboard
                 // layout has been removed.
@@ -137,31 +147,36 @@
         return sb.toString();
     }
 
-    private static InputMethodSubtype buildInputMethodSubtype(int nameId, String localeString,
-            String layoutExtraValue, String additionalSubtypeExtraValue) {
-        // CAVEAT! If you want to change subtypeId after changing the extra values,
-        // you must change "getInputMethodSubtypeId". But it will remove the additional keyboard
-        // from the current users. So, you should be really careful to change it.
-        final int subtypeId = getInputMethodSubtypeId(nameId, localeString, layoutExtraValue,
-                additionalSubtypeExtraValue);
+    private static InputMethodSubtype buildInputMethodSubtype(final int nameId,
+            final String localeString, final String layoutExtraValue,
+            final String additionalSubtypeExtraValue) {
+        // To preserve additional subtype settings and user's selection across OS updates, subtype
+        // id shouldn't be changed. New attributes, such as emojiCapable, are carefully excluded
+        // from the calculation of subtype id.
+        final String compatibleExtraValue = StringUtils.joinCommaSplittableText(
+                layoutExtraValue, additionalSubtypeExtraValue);
+        final int compatibleSubtypeId = getInputMethodSubtypeId(localeString, compatibleExtraValue);
         final String extraValue;
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
-            extraValue = layoutExtraValue + "," + additionalSubtypeExtraValue
-                    + "," + Constants.Subtype.ExtraValue.ASCII_CAPABLE
-                    + "," + Constants.Subtype.ExtraValue.EMOJI_CAPABLE;
+        // Color Emoji is supported from KitKat.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+            extraValue = StringUtils.appendToCommaSplittableTextIfNotExists(
+                    EMOJI_CAPABLE, compatibleExtraValue);
         } else {
-            extraValue = layoutExtraValue + "," + additionalSubtypeExtraValue;
+            extraValue = compatibleExtraValue;
         }
         return InputMethodSubtypeCompatUtils.newInputMethodSubtype(nameId,
                 R.drawable.ic_ime_switcher_dark, localeString, KEYBOARD_MODE, extraValue,
-                false, false, subtypeId);
+                false, false, compatibleSubtypeId);
     }
 
-    private static int getInputMethodSubtypeId(int nameId, String localeString,
-            String layoutExtraValue, String additionalSubtypeExtraValue) {
-        // TODO: Use InputMethodSubtypeBuilder once we use SDK version 19.
-        return (new InputMethodSubtype(nameId, R.drawable.ic_ime_switcher_dark,
-                localeString, KEYBOARD_MODE, layoutExtraValue + "," + additionalSubtypeExtraValue,
-                        false, false)).hashCode();
+    private static int getInputMethodSubtypeId(final String localeString, final String extraValue) {
+        // From the compatibility point of view, the calculation of subtype id has been copied from
+        // {@link InputMethodSubtype} of JellyBean MR2.
+        return Arrays.hashCode(new Object[] {
+                localeString,
+                KEYBOARD_MODE,
+                extraValue,
+                false /* isAuxiliary */,
+                false /* overrideImplicitlyEnabledSubtype */ });
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/ApplicationUtils.java b/java/src/com/android/inputmethod/latin/utils/ApplicationUtils.java
index 08a2a8c..7a4150d 100644
--- a/java/src/com/android/inputmethod/latin/utils/ApplicationUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/ApplicationUtils.java
@@ -31,7 +31,7 @@
         // This utility class is not publicly instantiable.
     }
 
-    public static int getAcitivityTitleResId(final Context context,
+    public static int getActivityTitleResId(final Context context,
             final Class<? extends Activity> cls) {
         final ComponentName cn = new ComponentName(context, cls);
         try {
@@ -62,4 +62,22 @@
         }
         return "";
     }
+
+    /**
+     * A utility method to get the application's PackageInfo.versionCode
+     * @return the application's PackageInfo.versionCode
+     */
+    public static int getVersionCode(final Context context) {
+        try {
+            if (context == null) {
+                return 0;
+            }
+            final String packageName = context.getPackageName();
+            final PackageInfo info = context.getPackageManager().getPackageInfo(packageName, 0);
+            return info.versionCode;
+        } catch (final NameNotFoundException e) {
+            Log.e(TAG, "Could not find version info.", e);
+        }
+        return 0;
+    }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/AsyncResultHolder.java b/java/src/com/android/inputmethod/latin/utils/AsyncResultHolder.java
index c2e97a3..d12aad6 100644
--- a/java/src/com/android/inputmethod/latin/utils/AsyncResultHolder.java
+++ b/java/src/com/android/inputmethod/latin/utils/AsyncResultHolder.java
@@ -20,7 +20,7 @@
 import java.util.concurrent.TimeUnit;
 
 /**
- * This class is a holder of a result of asynchronous computation.
+ * This class is a holder of the result of an asynchronous computation.
  *
  * @param <E> the type of the result.
  */
@@ -36,9 +36,9 @@
     }
 
     /**
-     * Sets the result value to this holder.
+     * Sets the result value of this holder.
      *
-     * @param result the value which is set.
+     * @param result the value to set.
      */
     public void set(final E result) {
         synchronized(mLock) {
@@ -54,12 +54,12 @@
      * Causes the current thread to wait unless the value is set or the specified time is elapsed.
      *
      * @param defaultValue the default value.
-     * @param timeOut the time to wait.
-     * @return if the result is set until the time limit then the result, otherwise defaultValue.
+     * @param timeOut the maximum time to wait.
+     * @return if the result is set before the time limit then the result, otherwise defaultValue.
      */
     public E get(final E defaultValue, final long timeOut) {
         try {
-            if(mLatch.await(timeOut, TimeUnit.MILLISECONDS)) {
+            if (mLatch.await(timeOut, TimeUnit.MILLISECONDS)) {
                 return mResult;
             } else {
                 return defaultValue;
diff --git a/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java b/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java
index 066c5fd..37c173f 100644
--- a/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/AutoCorrectionUtils.java
@@ -17,16 +17,11 @@
 package com.android.inputmethod.latin.utils;
 
 import com.android.inputmethod.latin.BinaryDictionary;
-import com.android.inputmethod.latin.Dictionary;
 import com.android.inputmethod.latin.LatinImeLogger;
-import com.android.inputmethod.latin.Suggest;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 
-import android.text.TextUtils;
 import android.util.Log;
 
-import java.util.concurrent.ConcurrentHashMap;
-
 public final class AutoCorrectionUtils {
     private static final boolean DBG = LatinImeLogger.sDBG;
     private static final String TAG = AutoCorrectionUtils.class.getSimpleName();
@@ -36,48 +31,6 @@
         // Purely static class: can't instantiate.
     }
 
-    public static boolean isValidWord(final Suggest suggest, final String word,
-            final boolean ignoreCase) {
-        if (TextUtils.isEmpty(word)) {
-            return false;
-        }
-        final ConcurrentHashMap<String, Dictionary> dictionaries = suggest.getUnigramDictionaries();
-        final String lowerCasedWord = word.toLowerCase(suggest.mLocale);
-        for (final String key : dictionaries.keySet()) {
-            final Dictionary dictionary = dictionaries.get(key);
-            // It's unclear how realistically 'dictionary' can be null, but the monkey is somehow
-            // managing to get null in here. Presumably the language is changing to a language with
-            // no main dictionary and the monkey manages to type a whole word before the thread
-            // that reads the dictionary is started or something?
-            // Ideally the passed map would come out of a {@link java.util.concurrent.Future} and
-            // would be immutable once it's finished initializing, but concretely a null test is
-            // probably good enough for the time being.
-            if (null == dictionary) continue;
-            if (dictionary.isValidWord(word)
-                    || (ignoreCase && dictionary.isValidWord(lowerCasedWord))) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    public static int getMaxFrequency(final ConcurrentHashMap<String, Dictionary> dictionaries,
-            final String word) {
-        if (TextUtils.isEmpty(word)) {
-            return Dictionary.NOT_A_PROBABILITY;
-        }
-        int maxFreq = -1;
-        for (final String key : dictionaries.keySet()) {
-            final Dictionary dictionary = dictionaries.get(key);
-            if (null == dictionary) continue;
-            final int tempFreq = dictionary.getFrequency(word);
-            if (tempFreq >= maxFreq) {
-                maxFreq = tempFreq;
-            }
-        }
-        return maxFreq;
-    }
-
     public static boolean suggestionExceedsAutoCorrectionThreshold(
             final SuggestedWordInfo suggestion, final String consideredWord,
             final float autoCorrectionThreshold) {
diff --git a/java/src/com/android/inputmethod/latin/utils/DictionaryInfoUtils.java b/java/src/com/android/inputmethod/latin/utils/DictionaryInfoUtils.java
index 021bf08..3daa63f 100644
--- a/java/src/com/android/inputmethod/latin/utils/DictionaryInfoUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/DictionaryInfoUtils.java
@@ -282,10 +282,19 @@
         return BinaryDictIOUtils.getDictionaryFileHeaderOrNull(file, 0, file.length());
     }
 
+    /**
+     * Returns information of the dictionary.
+     *
+     * @param fileAddress the asset dictionary file address.
+     * @return information of the specified dictionary.
+     */
     private static DictionaryInfo createDictionaryInfoFromFileAddress(
             final AssetFileAddress fileAddress) {
         final FileHeader header = BinaryDictIOUtils.getDictionaryFileHeaderOrNull(
                 new File(fileAddress.mFilename), fileAddress.mOffset, fileAddress.mLength);
+        if (header == null) {
+            return null;
+        }
         final String id = header.getId();
         final Locale locale = LocaleUtils.constructLocaleFromString(header.getLocaleString());
         final String description = header.getDescription();
@@ -328,7 +337,7 @@
                     // Protect against cases of a less-specific dictionary being found, like an
                     // en dictionary being used for an en_US locale. In this case, the en dictionary
                     // should be used for en_US but discounted for listing purposes.
-                    if (!dictionaryInfo.mLocale.equals(locale)) continue;
+                    if (dictionaryInfo == null || !dictionaryInfo.mLocale.equals(locale)) continue;
                     addOrUpdateDictInfo(dictList, dictionaryInfo);
                 }
             }
diff --git a/java/src/com/android/inputmethod/latin/utils/FileUtils.java b/java/src/com/android/inputmethod/latin/utils/FileUtils.java
new file mode 100644
index 0000000..f1106a6
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/utils/FileUtils.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.android.inputmethod.latin.utils;
+
+import java.io.File;
+import java.io.FilenameFilter;
+
+/**
+ * A simple class to help with removing directories recursively.
+ */
+public class FileUtils {
+    public static boolean deleteRecursively(final File path) {
+        if (path.isDirectory()) {
+            final File[] files = path.listFiles();
+            if (files != null) {
+                for (final File child : files) {
+                    deleteRecursively(child);
+                }
+            }
+        }
+        return path.delete();
+    }
+
+    public static boolean deleteFilteredFiles(final File dir, final FilenameFilter fileNameFilter) {
+        if (!dir.isDirectory()) {
+            return false;
+        }
+        final File[] files = dir.listFiles(fileNameFilter);
+        if (files == null) {
+            return false;
+        }
+        boolean hasDeletedAllFiles = true;
+        for (final File file : files) {
+            if (!deleteRecursively(file)) {
+                hasDeletedAllFiles = false;
+            }
+        }
+        return hasDeletedAllFiles;
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/utils/JsonUtils.java b/java/src/com/android/inputmethod/latin/utils/JsonUtils.java
new file mode 100644
index 0000000..764ef72
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/utils/JsonUtils.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.utils;
+
+import android.util.JsonReader;
+import android.util.JsonWriter;
+import android.util.Log;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.io.StringReader;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public final class JsonUtils {
+    private static final String TAG = JsonUtils.class.getSimpleName();
+
+    private static final String INTEGER_CLASS_NAME = Integer.class.getSimpleName();
+    private static final String STRING_CLASS_NAME = String.class.getSimpleName();
+
+    private static final String EMPTY_STRING = "";
+
+    public static List<Object> jsonStrToList(final String s) {
+        final ArrayList<Object> list = CollectionUtils.newArrayList();
+        final JsonReader reader = new JsonReader(new StringReader(s));
+        try {
+            reader.beginArray();
+            while (reader.hasNext()) {
+                reader.beginObject();
+                while (reader.hasNext()) {
+                    final String name = reader.nextName();
+                    if (name.equals(INTEGER_CLASS_NAME)) {
+                        list.add(reader.nextInt());
+                    } else if (name.equals(STRING_CLASS_NAME)) {
+                        list.add(reader.nextString());
+                    } else {
+                        Log.w(TAG, "Invalid name: " + name);
+                        reader.skipValue();
+                    }
+                }
+                reader.endObject();
+            }
+            reader.endArray();
+            return list;
+        } catch (final IOException e) {
+        } finally {
+            close(reader);
+        }
+        return Collections.<Object>emptyList();
+    }
+
+    public static String listToJsonStr(final List<Object> list) {
+        if (list == null || list.isEmpty()) {
+            return EMPTY_STRING;
+        }
+        final StringWriter sw = new StringWriter();
+        final JsonWriter writer = new JsonWriter(sw);
+        try {
+            writer.beginArray();
+            for (final Object o : list) {
+                writer.beginObject();
+                if (o instanceof Integer) {
+                    writer.name(INTEGER_CLASS_NAME).value((Integer)o);
+                } else if (o instanceof String) {
+                    writer.name(STRING_CLASS_NAME).value((String)o);
+                }
+                writer.endObject();
+            }
+            writer.endArray();
+            return sw.toString();
+        } catch (final IOException e) {
+        } finally {
+            close(writer);
+        }
+        return EMPTY_STRING;
+    }
+
+    private static void close(final Closeable closeable) {
+        try {
+            if (closeable != null) {
+                closeable.close();
+            }
+        } catch (final IOException e) {
+            // Ignore
+        }
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/utils/LatinImeLoggerUtils.java b/java/src/com/android/inputmethod/latin/utils/LatinImeLoggerUtils.java
index e958a7e..d14ba50 100644
--- a/java/src/com/android/inputmethod/latin/utils/LatinImeLoggerUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/LatinImeLoggerUtils.java
@@ -35,7 +35,7 @@
     public static void onSeparator(final int code, final int x, final int y) {
         // Helper method to log a single code point separator
         // TODO: cache this mapping of a code point to a string in a sparse array in StringUtils
-        onSeparator(new String(new int[]{code}, 0, 1), x, y);
+        onSeparator(StringUtils.newSingleCodePointString(code), x, y);
     }
 
     public static void onSeparator(final String separator, final int x, final int y) {
diff --git a/java/src/com/android/inputmethod/latin/utils/StaticInnerHandlerWrapper.java b/java/src/com/android/inputmethod/latin/utils/LeakGuardHandlerWrapper.java
similarity index 60%
rename from java/src/com/android/inputmethod/latin/utils/StaticInnerHandlerWrapper.java
rename to java/src/com/android/inputmethod/latin/utils/LeakGuardHandlerWrapper.java
index 44e5d17..8469c87 100644
--- a/java/src/com/android/inputmethod/latin/utils/StaticInnerHandlerWrapper.java
+++ b/java/src/com/android/inputmethod/latin/utils/LeakGuardHandlerWrapper.java
@@ -21,22 +21,22 @@
 
 import java.lang.ref.WeakReference;
 
-public class StaticInnerHandlerWrapper<T> extends Handler {
-    private final WeakReference<T> mOuterInstanceRef;
+public class LeakGuardHandlerWrapper<T> extends Handler {
+    private final WeakReference<T> mOwnerInstanceRef;
 
-    public StaticInnerHandlerWrapper(final T outerInstance) {
-        this(outerInstance, Looper.myLooper());
+    public LeakGuardHandlerWrapper(final T ownerInstance) {
+        this(ownerInstance, Looper.myLooper());
     }
 
-    public StaticInnerHandlerWrapper(final T outerInstance, final Looper looper) {
+    public LeakGuardHandlerWrapper(final T ownerInstance, final Looper looper) {
         super(looper);
-        if (outerInstance == null) {
-            throw new NullPointerException("outerInstance is null");
+        if (ownerInstance == null) {
+            throw new NullPointerException("ownerInstance is null");
         }
-        mOuterInstanceRef = new WeakReference<T>(outerInstance);
+        mOwnerInstanceRef = new WeakReference<T>(ownerInstance);
     }
 
-    public T getOuterInstance() {
-        return mOuterInstanceRef.get();
+    public T getOwnerInstance() {
+        return mOwnerInstanceRef.get();
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/LocaleUtils.java b/java/src/com/android/inputmethod/latin/utils/LocaleUtils.java
index 22045aa..0c55484 100644
--- a/java/src/com/android/inputmethod/latin/utils/LocaleUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/LocaleUtils.java
@@ -30,9 +30,6 @@
  * dictionary pack.
  */
 public final class LocaleUtils {
-    private static final HashMap<String, Long> EMPTY_LT_HASH_MAP = CollectionUtils.newHashMap();
-    private static final String LOCALE_AND_TIME_STR_SEPARATER = ",";
-
     private LocaleUtils() {
         // Intentional empty constructor for utility class.
     }
@@ -168,12 +165,14 @@
      * Creates a locale from a string specification.
      */
     public static Locale constructLocaleFromString(final String localeStr) {
-        if (localeStr == null)
+        if (localeStr == null) {
             return null;
+        }
         synchronized (sLocaleCache) {
-            if (sLocaleCache.containsKey(localeStr))
-                return sLocaleCache.get(localeStr);
-            Locale retval = null;
+            Locale retval = sLocaleCache.get(localeStr);
+            if (retval != null) {
+                return retval;
+            }
             String[] localeParams = localeStr.split("_", 3);
             if (localeParams.length == 1) {
                 retval = new Locale(localeParams[0]);
@@ -188,38 +187,4 @@
             return retval;
         }
     }
-
-    public static HashMap<String, Long> localeAndTimeStrToHashMap(String str) {
-        if (TextUtils.isEmpty(str)) {
-            return EMPTY_LT_HASH_MAP;
-        }
-        final String[] ss = str.split(LOCALE_AND_TIME_STR_SEPARATER);
-        final int N = ss.length;
-        if (N < 2 || N % 2 != 0) {
-            return EMPTY_LT_HASH_MAP;
-        }
-        final HashMap<String, Long> retval = CollectionUtils.newHashMap();
-        for (int i = 0; i < N / 2; ++i) {
-            final String localeStr = ss[i * 2];
-            final long time = Long.valueOf(ss[i * 2 + 1]);
-            retval.put(localeStr, time);
-        }
-        return retval;
-    }
-
-    public static String localeAndTimeHashMapToStr(HashMap<String, Long> map) {
-        if (map == null || map.isEmpty()) {
-            return "";
-        }
-        final StringBuilder builder = new StringBuilder();
-        for (String localeStr : map.keySet()) {
-            if (builder.length() > 0) {
-                builder.append(LOCALE_AND_TIME_STR_SEPARATER);
-            }
-            final Long time = map.get(localeStr);
-            builder.append(localeStr).append(LOCALE_AND_TIME_STR_SEPARATER);
-            builder.append(String.valueOf(time));
-        }
-        return builder.toString();
-    }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java b/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
index 201a70d..b10d08a 100644
--- a/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
+++ b/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
@@ -137,6 +137,7 @@
     public void shutdown() {
         synchronized(mLock) {
             mIsShutdown = true;
+            mThreadPoolExecutor.shutdown();
         }
     }
 
diff --git a/java/src/com/android/inputmethod/latin/utils/ResourceUtils.java b/java/src/com/android/inputmethod/latin/utils/ResourceUtils.java
index 22c9244..deb28a0 100644
--- a/java/src/com/android/inputmethod/latin/utils/ResourceUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/ResourceUtils.java
@@ -227,19 +227,19 @@
         final String keyboardHeightString = getDeviceOverrideValue(res, R.array.keyboard_heights);
         final float keyboardHeight;
         if (TextUtils.isEmpty(keyboardHeightString)) {
-            keyboardHeight = res.getDimension(R.dimen.keyboardHeight);
+            keyboardHeight = res.getDimension(R.dimen.config_default_keyboard_height);
         } else {
             keyboardHeight = Float.parseFloat(keyboardHeightString) * dm.density;
         }
         final float maxKeyboardHeight = res.getFraction(
-                R.fraction.maxKeyboardHeight, dm.heightPixels, dm.heightPixels);
+                R.fraction.config_max_keyboard_height, dm.heightPixels, dm.heightPixels);
         float minKeyboardHeight = res.getFraction(
-                R.fraction.minKeyboardHeight, dm.heightPixels, dm.heightPixels);
+                R.fraction.config_min_keyboard_height, dm.heightPixels, dm.heightPixels);
         if (minKeyboardHeight < 0.0f) {
             // Specified fraction was negative, so it should be calculated against display
             // width.
             minKeyboardHeight = -res.getFraction(
-                    R.fraction.minKeyboardHeight, dm.widthPixels, dm.widthPixels);
+                    R.fraction.config_min_keyboard_height, dm.widthPixels, dm.widthPixels);
         }
         // Keyboard height will not exceed maxKeyboardHeight and will not be less than
         // minKeyboardHeight.
diff --git a/java/src/com/android/inputmethod/latin/utils/SpannableStringUtils.java b/java/src/com/android/inputmethod/latin/utils/SpannableStringUtils.java
index b51fd93..be09554 100644
--- a/java/src/com/android/inputmethod/latin/utils/SpannableStringUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/SpannableStringUtils.java
@@ -40,12 +40,17 @@
      * are out of range in <code>dest</code>.
      */
     public static void copyNonParagraphSuggestionSpansFrom(Spanned source, int start, int end,
-                                     Spannable dest, int destoff) {
+            Spannable dest, int destoff) {
         Object[] spans = source.getSpans(start, end, SuggestionSpan.class);
 
         for (int i = 0; i < spans.length; i++) {
             int fl = source.getSpanFlags(spans[i]);
-            if (0 != (fl & Spannable.SPAN_PARAGRAPH)) continue;
+            // We don't care about the PARAGRAPH flag in LatinIME code. However, if this flag
+            // is set, Spannable#setSpan will throw an exception unless the span is on the edge
+            // of a word. But the spans have been split into two by the getText{Before,After}Cursor
+            // methods, so after concatenation they may end in the middle of a word.
+            // Since we don't use them, we can just remove them and avoid crashing.
+            fl &= ~Spannable.SPAN_PARAGRAPH;
 
             int st = source.getSpanStart(spans[i]);
             int en = source.getSpanEnd(spans[i]);
diff --git a/java/src/com/android/inputmethod/latin/utils/StringUtils.java b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
index a365483..85f4454 100644
--- a/java/src/com/android/inputmethod/latin/utils/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
@@ -16,20 +16,15 @@
 
 package com.android.inputmethod.latin.utils;
 
+import android.text.TextUtils;
+import android.util.Log;
+
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.settings.SettingsValues;
 
-import android.text.TextUtils;
-import android.util.JsonReader;
-import android.util.JsonWriter;
-import android.util.Log;
-
 import java.io.IOException;
-import java.io.StringReader;
-import java.io.StringWriter;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
 
@@ -39,6 +34,8 @@
     public static final int CAPITALIZE_FIRST = 1; // First only
     public static final int CAPITALIZE_ALL = 2;   // All caps
 
+    private static final String EMPTY_STRING = "";
+
     private StringUtils() {
         // This utility class is not publicly instantiable.
     }
@@ -80,6 +77,20 @@
         return containsInArray(text, extraValues.split(SEPARATOR_FOR_COMMA_SPLITTABLE_TEXT));
     }
 
+    public static String joinCommaSplittableText(final String head, final String tail) {
+        if (TextUtils.isEmpty(head) && TextUtils.isEmpty(tail)) {
+            return EMPTY_STRING;
+        }
+        // Here either head or tail is not null.
+        if (TextUtils.isEmpty(head)) {
+            return tail;
+        }
+        if (TextUtils.isEmpty(tail)) {
+            return head;
+        }
+        return head + SEPARATOR_FOR_COMMA_SPLITTABLE_TEXT + tail;
+    }
+
     public static String appendToCommaSplittableTextIfNotExists(final String text,
             final String extraValues) {
         if (TextUtils.isEmpty(extraValues)) {
@@ -94,7 +105,7 @@
     public static String removeFromCommaSplittableTextIfExists(final String text,
             final String extraValues) {
         if (TextUtils.isEmpty(extraValues)) {
-            return "";
+            return EMPTY_STRING;
         }
         final String[] elements = extraValues.split(SEPARATOR_FOR_COMMA_SPLITTABLE_TEXT);
         if (!containsInArray(text, elements)) {
@@ -239,6 +250,24 @@
         return true;
     }
 
+    /**
+     * Returns true if all code points in text are whitespace, false otherwise. Empty is true.
+     */
+    // Interestingly enough, U+00A0 NO-BREAK SPACE and U+200B ZERO-WIDTH SPACE are not considered
+    // whitespace, while EN SPACE, EM SPACE and IDEOGRAPHIC SPACES are.
+    public static boolean containsOnlyWhitespace(final String text) {
+        final int length = text.length();
+        int i = 0;
+        while (i < length) {
+            final int codePoint = text.codePointAt(i);
+            if (!Character.isWhitespace(codePoint)) {
+                return false;
+            }
+            i += Character.charCount(codePoint);
+        }
+        return true;
+    }
+
     @UsedForTesting
     public static boolean looksValidForDictionaryInsertion(final CharSequence text,
             final SettingsValues settings) {
@@ -367,7 +396,7 @@
         return false;
     }
 
-    public static boolean isEmptyStringOrWhiteSpaces(String s) {
+    public static boolean isEmptyStringOrWhiteSpaces(final String s) {
         final int N = codePointCount(s);
         for (int i = 0; i < N; ++i) {
             if (!Character.isWhitespace(s.codePointAt(i))) {
@@ -378,9 +407,9 @@
     }
 
     @UsedForTesting
-    public static String byteArrayToHexString(byte[] bytes) {
+    public static String byteArrayToHexString(final byte[] bytes) {
         if (bytes == null || bytes.length == 0) {
-            return "";
+            return EMPTY_STRING;
         }
         final StringBuilder sb = new StringBuilder();
         for (byte b : bytes) {
@@ -393,7 +422,7 @@
      * Convert hex string to byte array. The string length must be an even number.
      */
     @UsedForTesting
-    public static byte[] hexStringToByteArray(String hexString) {
+    public static byte[] hexStringToByteArray(final String hexString) {
         if (TextUtils.isEmpty(hexString)) {
             return null;
         }
@@ -409,67 +438,4 @@
         }
         return bytes;
     }
-
-    public static List<Object> jsonStrToList(String s) {
-        final ArrayList<Object> retval = CollectionUtils.newArrayList();
-        final JsonReader reader = new JsonReader(new StringReader(s));
-        try {
-            reader.beginArray();
-            while(reader.hasNext()) {
-                reader.beginObject();
-                while (reader.hasNext()) {
-                    final String name = reader.nextName();
-                    if (name.equals(Integer.class.getSimpleName())) {
-                        retval.add(reader.nextInt());
-                    } else if (name.equals(String.class.getSimpleName())) {
-                        retval.add(reader.nextString());
-                    } else {
-                        Log.w(TAG, "Invalid name: " + name);
-                        reader.skipValue();
-                    }
-                }
-                reader.endObject();
-            }
-            reader.endArray();
-            return retval;
-        } catch (IOException e) {
-        } finally {
-            try {
-                reader.close();
-            } catch (IOException e) {
-            }
-        }
-        return Collections.<Object>emptyList();
-    }
-
-    public static String listToJsonStr(List<Object> list) {
-        if (list == null || list.isEmpty()) {
-            return "";
-        }
-        final StringWriter sw = new StringWriter();
-        final JsonWriter writer = new JsonWriter(sw);
-        try {
-            writer.beginArray();
-            for (final Object o : list) {
-                writer.beginObject();
-                if (o instanceof Integer) {
-                    writer.name(Integer.class.getSimpleName()).value((Integer)o);
-                } else if (o instanceof String) {
-                    writer.name(String.class.getSimpleName()).value((String)o);
-                }
-                writer.endObject();
-            }
-            writer.endArray();
-            return sw.toString();
-        } catch (IOException e) {
-        } finally {
-            try {
-                if (writer != null) {
-                    writer.close();
-                }
-            } catch (IOException e) {
-            }
-        }
-        return "";
-    }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtils.java b/java/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtils.java
index 102a41b..fdbe81a 100644
--- a/java/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtils.java
@@ -197,7 +197,9 @@
     //  es_US spanish F  Español (EE.UU.)        exception
     //  fr    azerty  F  Français
     //  fr_CA qwerty  F  Français (Canada)
+    //  fr_CH swiss   F  Français (Suisse)
     //  de    qwertz  F  Deutsch
+    //  de_CH swiss   T  Deutsch (Schweiz)
     //  zz    qwerty  F  No language (QWERTY)    in system locale
     //  fr    qwertz  T  Français (QWERTZ)
     //  de    qwerty  T  Deutsch (QWERTY)
@@ -298,7 +300,9 @@
     //  es_US spanish F  Es  Español   Español (EE.UU.)       exception
     //  fr    azerty  F  Fr  Français  Français
     //  fr_CA qwerty  F  Fr  Français  Français (Canada)
+    //  fr_CH swiss   F  Fr  Français  Français (Suisse)
     //  de    qwertz  F  De  Deutsch   Deutsch
+    //  de_CH swiss   T  De  Deutsch   Deutsch (Schweiz)
     //  zz    qwerty  F      QWERTY    QWERTY
     //  fr    qwertz  T  Fr  Français  Français
     //  de    qwerty  T  De  Deutsch   Deutsch
diff --git a/java/src/com/android/inputmethod/latin/utils/TargetPackageInfoGetterTask.java b/java/src/com/android/inputmethod/latin/utils/TargetPackageInfoGetterTask.java
index afbe2ec..42ea3c9 100644
--- a/java/src/com/android/inputmethod/latin/utils/TargetPackageInfoGetterTask.java
+++ b/java/src/com/android/inputmethod/latin/utils/TargetPackageInfoGetterTask.java
@@ -22,6 +22,8 @@
 import android.os.AsyncTask;
 import android.util.LruCache;
 
+import com.android.inputmethod.compat.AppWorkaroundsUtils;
+
 public final class TargetPackageInfoGetterTask extends
         AsyncTask<String, Void, PackageInfo> {
     private static final int MAX_CACHE_ENTRIES = 64; // arbitrary
@@ -37,17 +39,13 @@
         sCache.remove(packageName);
     }
 
-    public interface OnTargetPackageInfoKnownListener {
-        public void onTargetPackageInfoKnown(final PackageInfo info);
-    }
-
     private Context mContext;
-    private final OnTargetPackageInfoKnownListener mListener;
+    private final AsyncResultHolder<AppWorkaroundsUtils> mResult;
 
     public TargetPackageInfoGetterTask(final Context context,
-            final OnTargetPackageInfoKnownListener listener) {
+            final AsyncResultHolder<AppWorkaroundsUtils> result) {
         mContext = context;
-        mListener = listener;
+        mResult = result;
     }
 
     @Override
@@ -65,6 +63,6 @@
 
     @Override
     protected void onPostExecute(final PackageInfo info) {
-        mListener.onTargetPackageInfoKnown(info);
+        mResult.set(new AppWorkaroundsUtils(info));
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/TypefaceUtils.java b/java/src/com/android/inputmethod/latin/utils/TypefaceUtils.java
index 47ea1ea..087a7f2 100644
--- a/java/src/com/android/inputmethod/latin/utils/TypefaceUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/TypefaceUtils.java
@@ -22,6 +22,9 @@
 import android.util.SparseArray;
 
 public final class TypefaceUtils {
+    private static final char[] KEY_LABEL_REFERENCE_CHAR = { 'M' };
+    private static final char[] KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR = { '8' };
+
     private TypefaceUtils() {
         // This utility class is not publicly instantiable.
     }
@@ -31,7 +34,7 @@
     // Working variable for the following method.
     private static final Rect sTextHeightBounds = new Rect();
 
-    public static float getCharHeight(final char[] referenceChar, final Paint paint) {
+    private static float getCharHeight(final char[] referenceChar, final Paint paint) {
         final int key = getCharGeometryCacheKey(referenceChar[0], paint);
         synchronized (sTextHeightCache) {
             final Float cachedValue = sTextHeightCache.get(key);
@@ -51,7 +54,7 @@
     // Working variable for the following method.
     private static final Rect sTextWidthBounds = new Rect();
 
-    public static float getCharWidth(final char[] referenceChar, final Paint paint) {
+    private static float getCharWidth(final char[] referenceChar, final Paint paint) {
         final int key = getCharGeometryCacheKey(referenceChar[0], paint);
         synchronized (sTextWidthCache) {
             final Float cachedValue = sTextWidthCache.get(key);
@@ -66,11 +69,6 @@
         }
     }
 
-    public static float getStringWidth(final String string, final Paint paint) {
-        paint.getTextBounds(string, 0, string.length(), sTextWidthBounds);
-        return sTextWidthBounds.width();
-    }
-
     private static int getCharGeometryCacheKey(final char referenceChar, final Paint paint) {
         final int labelSize = (int)paint.getTextSize();
         final Typeface face = paint.getTypeface();
@@ -86,9 +84,25 @@
         }
     }
 
-    public static float getLabelWidth(final String label, final Paint paint) {
-        final Rect textBounds = new Rect();
-        paint.getTextBounds(label, 0, label.length(), textBounds);
-        return textBounds.width();
+    public static float getReferenceCharHeight(final Paint paint) {
+        return getCharHeight(KEY_LABEL_REFERENCE_CHAR, paint);
+    }
+
+    public static float getReferenceCharWidth(final Paint paint) {
+        return getCharWidth(KEY_LABEL_REFERENCE_CHAR, paint);
+    }
+
+    public static float getReferenceDigitWidth(final Paint paint) {
+        return getCharWidth(KEY_NUMERIC_HINT_LABEL_REFERENCE_CHAR, paint);
+    }
+
+    // Working variable for the following method.
+    private static final Rect sStringWidthBounds = new Rect();
+
+    public static float getStringWidth(final String string, final Paint paint) {
+        synchronized (sStringWidthBounds) {
+            paint.getTextBounds(string, 0, string.length(), sStringWidthBounds);
+            return sStringWidthBounds.width();
+        }
     }
 }
diff --git a/java/src/com/android/inputmethod/latin/utils/UnigramProperty.java b/java/src/com/android/inputmethod/latin/utils/UnigramProperty.java
new file mode 100644
index 0000000..4feee43
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/utils/UnigramProperty.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package com.android.inputmethod.latin.utils;
+
+import com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.latin.BinaryDictionary;
+import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
+
+import java.util.ArrayList;
+
+// This has information that belong to a unigram. This class has some detailed attributes such as
+// historical information but they have to be checked only for testing purpose.
+@UsedForTesting
+public class UnigramProperty {
+    public final String mCodePoints;
+    public final boolean mIsNotAWord;
+    public final boolean mIsBlacklisted;
+    public final boolean mHasBigrams;
+    public final boolean mHasShortcuts;
+    public final int mProbability;
+    // mTimestamp, mLevel and mCount are historical info. These values are depend on the
+    // implementation in native code; thus, we must not use them and have any assumptions about
+    // them except for tests.
+    public final int mTimestamp;
+    public final int mLevel;
+    public final int mCount;
+    public final ArrayList<WeightedString> mShortcutTargets = CollectionUtils.newArrayList();
+
+    private static int getCodePointCount(final int[] codePoints) {
+        for (int i = 0; i < codePoints.length; i++) {
+            if (codePoints[i] == 0) {
+                return i;
+            }
+        }
+        return codePoints.length;
+    }
+
+    // This represents invalid unigram when the probability is BinaryDictionary.NOT_A_PROBABILITY.
+    public UnigramProperty(final int[] codePoints, final boolean isNotAWord,
+            final boolean isBlacklisted, final boolean hasBigram,
+            final boolean hasShortcuts, final int probability, final int timestamp,
+            final int level, final int count, final ArrayList<int[]> shortcutTargets,
+            final ArrayList<Integer> shortcutProbabilities) {
+        mCodePoints = new String(codePoints, 0 /* offset */, getCodePointCount(codePoints));
+        mIsNotAWord = isNotAWord;
+        mIsBlacklisted = isBlacklisted;
+        mHasBigrams = hasBigram;
+        mHasShortcuts = hasShortcuts;
+        mProbability = probability;
+        mTimestamp = timestamp;
+        mLevel = level;
+        mCount = count;
+        final int shortcutTargetCount = shortcutTargets.size();
+        for (int i = 0; i < shortcutTargetCount; i++) {
+            final int[] shortcutTargetCodePointArray = shortcutTargets.get(i);
+            final String shortcutTargetString = new String(shortcutTargetCodePointArray,
+                    0 /* offset */, getCodePointCount(shortcutTargetCodePointArray));
+            mShortcutTargets.add(
+                    new WeightedString(shortcutTargetString, shortcutProbabilities.get(i)));
+        }
+    }
+
+    @UsedForTesting
+    public boolean isValid() {
+        return mProbability != BinaryDictionary.NOT_A_PROBABILITY;
+    }
+}
\ No newline at end of file
diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
index 635afe7..db628fe 100644
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
@@ -70,10 +70,11 @@
     /**
      * Writes dictionary to file.
      */
+    @UsedForTesting
     public static void writeDictionary(final DictEncoder dictEncoder,
             final BigramDictionaryInterface dict, final UserHistoryDictionaryBigramList bigrams,
-            final FormatOptions formatOptions) {
-        final FusionDictionary fusionDict = constructFusionDictionary(dict, bigrams);
+            final FormatOptions formatOptions, final HashMap<String, String> options) {
+        final FusionDictionary fusionDict = constructFusionDictionary(dict, bigrams, options);
         fusionDict.addOptionAttribute(USES_FORGETTING_CURVE_KEY, USES_FORGETTING_CURVE_VALUE);
         fusionDict.addOptionAttribute(LAST_UPDATED_TIME_KEY,
                 String.valueOf(TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())));
@@ -91,11 +92,10 @@
      * Constructs a new FusionDictionary from BigramDictionaryInterface.
      */
     @UsedForTesting
-    static FusionDictionary constructFusionDictionary(
-            final BigramDictionaryInterface dict, final UserHistoryDictionaryBigramList bigrams) {
+    static FusionDictionary constructFusionDictionary(final BigramDictionaryInterface dict,
+            final UserHistoryDictionaryBigramList bigrams, final HashMap<String, String> options) {
         final FusionDictionary fusionDict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(new HashMap<String, String>(), false,
-                        false));
+                new FusionDictionary.DictionaryOptions(options));
         int profTotal = 0;
         for (final String word1 : bigrams.keySet()) {
             final HashMap<String, Byte> word1Bigrams = bigrams.getBigrams(word1);
diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryForgettingCurveUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryForgettingCurveUtils.java
deleted file mode 100644
index 1992b2f..0000000
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryForgettingCurveUtils.java
+++ /dev/null
@@ -1,233 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import android.util.Log;
-
-import java.util.concurrent.TimeUnit;
-
-public final class UserHistoryForgettingCurveUtils {
-    private static final String TAG = UserHistoryForgettingCurveUtils.class.getSimpleName();
-    private static final boolean DEBUG = false;
-    private static final int DEFAULT_FC_FREQ = 127;
-    private static final int BOOSTED_FC_FREQ = 200;
-    private static int FC_FREQ_MAX = DEFAULT_FC_FREQ;
-    /* package */ static final int COUNT_MAX = 3;
-    private static final int FC_LEVEL_MAX = 3;
-    /* package */ static final int ELAPSED_TIME_MAX = 15;
-    private static final int ELAPSED_TIME_INTERVAL_HOURS = 6;
-    private static final long ELAPSED_TIME_INTERVAL_MILLIS =
-            TimeUnit.HOURS.toMillis(ELAPSED_TIME_INTERVAL_HOURS);
-    private static final int HALF_LIFE_HOURS = 48;
-    private static final int MAX_PUSH_ELAPSED = (FC_LEVEL_MAX + 1) * (ELAPSED_TIME_MAX + 1);
-
-    public static void boostMaxFreqForDebug() {
-        FC_FREQ_MAX = BOOSTED_FC_FREQ;
-    }
-
-    public static void resetMaxFreqForDebug() {
-        FC_FREQ_MAX = DEFAULT_FC_FREQ;
-    }
-
-    private UserHistoryForgettingCurveUtils() {
-        // This utility class is not publicly instantiable.
-    }
-
-    public static final class ForgettingCurveParams {
-        private byte mFc;
-        long mLastTouchedTime = 0;
-        private final boolean mIsValid;
-
-        private void updateLastTouchedTime() {
-            mLastTouchedTime = System.currentTimeMillis();
-        }
-
-        public ForgettingCurveParams(boolean isValid) {
-            this(System.currentTimeMillis(), isValid);
-        }
-
-        private ForgettingCurveParams(long now, boolean isValid) {
-            this(pushCount((byte)0, isValid), now, now, isValid);
-        }
-
-        /** This constructor is called when the user history bigram dictionary is being restored. */
-        public ForgettingCurveParams(int fc, long now, long last) {
-            // All words with level >= 1 had been saved.
-            // Invalid words with level == 0 had been saved.
-            // Valid words words with level == 0 had *not* been saved.
-            this(fc, now, last, fcToLevel((byte)fc) > 0);
-        }
-
-        private ForgettingCurveParams(int fc, long now, long last, boolean isValid) {
-            mIsValid = isValid;
-            mFc = (byte)fc;
-            mLastTouchedTime = last;
-            updateElapsedTime(now);
-        }
-
-        public boolean isValid() {
-            return mIsValid;
-        }
-
-        public byte getFc() {
-            updateElapsedTime(System.currentTimeMillis());
-            return mFc;
-        }
-
-        public int getFrequency() {
-            updateElapsedTime(System.currentTimeMillis());
-            return UserHistoryForgettingCurveUtils.fcToFreq(mFc);
-        }
-
-        public int notifyTypedAgainAndGetFrequency() {
-            updateLastTouchedTime();
-            // TODO: Check whether this word is valid or not
-            mFc = pushCount(mFc, false);
-            return UserHistoryForgettingCurveUtils.fcToFreq(mFc);
-        }
-
-        private void updateElapsedTime(long now) {
-            final int elapsedTimeCount =
-                    (int)((now - mLastTouchedTime) / ELAPSED_TIME_INTERVAL_MILLIS);
-            if (elapsedTimeCount <= 0) {
-                return;
-            }
-            if (elapsedTimeCount >= MAX_PUSH_ELAPSED) {
-                mLastTouchedTime = now;
-                mFc = 0;
-                return;
-            }
-            for (int i = 0; i < elapsedTimeCount; ++i) {
-                mLastTouchedTime += ELAPSED_TIME_INTERVAL_MILLIS;
-                mFc = pushElapsedTime(mFc);
-            }
-        }
-    }
-
-    /* package */ static  int fcToElapsedTime(byte fc) {
-        return fc & 0x0F;
-    }
-
-    /* package */ static int fcToCount(byte fc) {
-        return (fc >> 4) & 0x03;
-    }
-
-    /* package */ static int fcToLevel(byte fc) {
-        return (fc >> 6) & 0x03;
-    }
-
-    private static int calcFreq(int elapsedTime, int count, int level) {
-        if (level <= 0) {
-            // Reserved words, just return -1
-            return -1;
-        }
-        if (count == COUNT_MAX) {
-            // Temporary promote because it's frequently typed recently
-            ++level;
-        }
-        final int et = Math.min(FC_FREQ_MAX, Math.max(0, elapsedTime));
-        final int l = Math.min(FC_LEVEL_MAX, Math.max(0, level));
-        return MathUtils.SCORE_TABLE[l - 1][et];
-    }
-
-    /* pakcage */ static byte calcFc(int elapsedTime, int count, int level) {
-        final int et = Math.min(FC_FREQ_MAX, Math.max(0, elapsedTime));
-        final int c = Math.min(COUNT_MAX, Math.max(0, count));
-        final int l = Math.min(FC_LEVEL_MAX, Math.max(0, level));
-        return (byte)(et | (c << 4) | (l << 6));
-    }
-
-    public static int fcToFreq(byte fc) {
-        final int elapsedTime = fcToElapsedTime(fc);
-        final int count = fcToCount(fc);
-        final int level = fcToLevel(fc);
-        return calcFreq(elapsedTime, count, level);
-    }
-
-    public static byte pushElapsedTime(byte fc) {
-        int elapsedTime = fcToElapsedTime(fc);
-        int count = fcToCount(fc);
-        int level = fcToLevel(fc);
-        if (elapsedTime >= ELAPSED_TIME_MAX) {
-            // Downgrade level
-            elapsedTime = 0;
-            count = COUNT_MAX;
-            --level;
-        } else {
-            ++elapsedTime;
-        }
-        return calcFc(elapsedTime, count, level);
-    }
-
-    public static byte pushCount(byte fc, boolean isValid) {
-        final int elapsedTime = fcToElapsedTime(fc);
-        int count = fcToCount(fc);
-        int level = fcToLevel(fc);
-        if ((elapsedTime == 0 && count >= COUNT_MAX) || (isValid && level == 0)) {
-            // Upgrade level
-            ++level;
-            count = 0;
-            if (DEBUG) {
-                Log.d(TAG, "Upgrade level.");
-            }
-        } else {
-            ++count;
-        }
-        return calcFc(0, count, level);
-    }
-
-    // TODO: isValid should be false for a word whose frequency is 0,
-    // or that is not in the dictionary.
-    /**
-     * Check wheather we should save the bigram to the SQL DB or not
-     */
-    public static boolean needsToSave(byte fc, boolean isValid, boolean addLevel0Bigram) {
-        int level = fcToLevel(fc);
-        if (level == 0) {
-            if (isValid || !addLevel0Bigram) {
-                return false;
-            }
-        }
-        final int elapsedTime = fcToElapsedTime(fc);
-        return (elapsedTime < ELAPSED_TIME_MAX - 1 || level > 0);
-    }
-
-    private static final class MathUtils {
-        public static final int[][] SCORE_TABLE = new int[FC_LEVEL_MAX][ELAPSED_TIME_MAX + 1];
-        static {
-            for (int i = 0; i < FC_LEVEL_MAX; ++i) {
-                final float initialFreq;
-                if (i >= 2) {
-                    initialFreq = FC_FREQ_MAX;
-                } else if (i == 1) {
-                    initialFreq = FC_FREQ_MAX / 2;
-                } else if (i == 0) {
-                    initialFreq = FC_FREQ_MAX / 4;
-                } else {
-                    continue;
-                }
-                for (int j = 0; j < ELAPSED_TIME_MAX; ++j) {
-                    final float elapsedHours = j * ELAPSED_TIME_INTERVAL_HOURS;
-                    final float freq = initialFreq
-                            * (float)Math.pow(initialFreq, elapsedHours / HALF_LIFE_HOURS);
-                    final int intFreq = Math.min(FC_FREQ_MAX, Math.max(0, (int)freq));
-                    SCORE_TABLE[i][j] = intFreq;
-                }
-            }
-        }
-    }
-}
diff --git a/java/src/com/android/inputmethod/research/MainLogBuffer.java b/java/src/com/android/inputmethod/research/MainLogBuffer.java
index 6df7c17..9b1d8c5 100644
--- a/java/src/com/android/inputmethod/research/MainLogBuffer.java
+++ b/java/src/com/android/inputmethod/research/MainLogBuffer.java
@@ -20,7 +20,7 @@
 
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.latin.Dictionary;
-import com.android.inputmethod.latin.Suggest;
+import com.android.inputmethod.latin.DictionaryFacilitatorForSuggest;
 import com.android.inputmethod.latin.define.ProductionFlag;
 
 import java.io.IOException;
@@ -75,9 +75,7 @@
     // The size of the n-grams logged.  E.g. N_GRAM_SIZE = 2 means to sample bigrams.
     public static final int N_GRAM_SIZE = 2;
 
-    // TODO: Remove dependence on Suggest, and pass in Dictionary as a parameter to an appropriate
-    // method.
-    private final Suggest mSuggest;
+    private final DictionaryFacilitatorForSuggest mDictionaryFacilitator;
     @UsedForTesting
     private Dictionary mDictionaryForTesting;
     private boolean mIsStopping = false;
@@ -89,11 +87,11 @@
     /* package for test */ int mNumWordsUntilSafeToSample;
 
     public MainLogBuffer(final int wordsBetweenSamples, final int numInitialWordsToIgnore,
-            final Suggest suggest) {
+            final DictionaryFacilitatorForSuggest dictionaryFacilitator) {
         super(N_GRAM_SIZE + wordsBetweenSamples);
         mNumWordsBetweenNGrams = wordsBetweenSamples;
         mNumWordsUntilSafeToSample = DEBUG ? 0 : numInitialWordsToIgnore;
-        mSuggest = suggest;
+        mDictionaryFacilitator = dictionaryFacilitator;
     }
 
     @UsedForTesting
@@ -101,12 +99,14 @@
         mDictionaryForTesting = dictionary;
     }
 
-    private Dictionary getDictionary() {
+    private boolean isValidDictWord(final String word) {
         if (mDictionaryForTesting != null) {
-            return mDictionaryForTesting;
+            return mDictionaryForTesting.isValidWord(word);
         }
-        if (mSuggest == null || !mSuggest.hasMainDictionary()) return null;
-        return mSuggest.getMainDictionary();
+        if (mDictionaryFacilitator != null) {
+            return mDictionaryFacilitator.isValidMainDictWord(word);
+        }
+        return false;
     }
 
     public void setIsStopping() {
@@ -155,8 +155,8 @@
         }
         // Reload the dictionary in case it has changed (e.g., because the user has changed
         // languages).
-        final Dictionary dictionary = getDictionary();
-        if (dictionary == null) {
+        if ((mDictionaryFacilitator == null || !mDictionaryFacilitator.hasMainDictionary())
+                && mDictionaryForTesting == null) {
             // Main dictionary is unavailable.  Since we cannot check it, we cannot tell if a
             // word is out-of-vocabulary or not.  Therefore, we must judge the entire buffer
             // contents to potentially pose a privacy risk.
@@ -166,7 +166,6 @@
         // Check each word in the buffer.  If any word poses a privacy threat, we cannot upload
         // the complete buffer contents in detail.
         int numWordsInLogUnitList = 0;
-        final int length = logUnits.size();
         for (final LogUnit logUnit : logUnits) {
             if (!logUnit.hasOneOrMoreWords()) {
                 // Digits outside words are a privacy threat.
@@ -178,11 +177,11 @@
                 final String[] words = logUnit.getWordsAsStringArray();
                 for (final String word : words) {
                     // Words not in the dictionary are a privacy threat.
-                    if (ResearchLogger.hasLetters(word) && !(dictionary.isValidWord(word))) {
+                    if (ResearchLogger.hasLetters(word) && !isValidDictWord(word)) {
                         if (DEBUG) {
                             Log.d(TAG, "\"" + word + "\" NOT SAFE!: hasLetters: "
                                     + ResearchLogger.hasLetters(word)
-                                    + ", isValid: " + (dictionary.isValidWord(word)));
+                                    + ", isValid: " + isValidDictWord(word));
                         }
                         return PUBLISHABILITY_UNPUBLISHABLE_NOT_IN_DICTIONARY;
                     }
diff --git a/java/src/com/android/inputmethod/research/ResearchLogger.java b/java/src/com/android/inputmethod/research/ResearchLogger.java
index da9c611..e7f49a6 100644
--- a/java/src/com/android/inputmethod/research/ResearchLogger.java
+++ b/java/src/com/android/inputmethod/research/ResearchLogger.java
@@ -52,11 +52,10 @@
 import com.android.inputmethod.keyboard.KeyboardView;
 import com.android.inputmethod.keyboard.MainKeyboardView;
 import com.android.inputmethod.latin.Constants;
-import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.DictionaryFacilitatorForSuggest;
 import com.android.inputmethod.latin.LatinIME;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.RichInputConnection;
-import com.android.inputmethod.latin.Suggest;
 import com.android.inputmethod.latin.SuggestedWords;
 import com.android.inputmethod.latin.define.ProductionFlag;
 import com.android.inputmethod.latin.utils.InputTypeUtils;
@@ -102,10 +101,6 @@
             && ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS_DEBUG;
     private static final boolean DEBUG_REPLAY_AFTER_FEEDBACK = false
             && ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS_DEBUG;
-    // Whether the TextView contents are logged at the end of the session.  true will disclose
-    // private info.
-    private static final boolean LOG_FULL_TEXTVIEW_CONTENTS = false
-            && ProductionFlag.USES_DEVELOPMENT_ONLY_DIAGNOSTICS_DEBUG;
     // Whether the feedback dialog preserves the editable text across invocations.  Should be false
     // for normal research builds so users do not have to delete the same feedback string they
     // entered earlier.  Should be true for builds internal to a development team so when the text
@@ -168,12 +163,9 @@
     // U+E001 is in the "private-use area"
     /* package for test */ static final String WORD_REPLACEMENT_STRING = "\uE001";
     protected static final int SUSPEND_DURATION_IN_MINUTES = 1;
-    // set when LatinIME should ignore an onUpdateSelection() callback that
-    // arises from operations in this class
-    private static boolean sLatinIMEExpectingUpdateSelection = false;
 
     // used to check whether words are not unique
-    private Suggest mSuggest;
+    private DictionaryFacilitatorForSuggest mDictionaryFacilitator;
     private MainKeyboardView mMainKeyboardView;
     // TODO: Check whether a superclass can be used instead of LatinIME.
     /* package for test */ LatinIME mLatinIME;
@@ -212,8 +204,7 @@
         return sInstance;
     }
 
-    public void init(final LatinIME latinIME, final KeyboardSwitcher keyboardSwitcher,
-            final Suggest suggest) {
+    public void init(final LatinIME latinIME, final KeyboardSwitcher keyboardSwitcher) {
         assert latinIME != null;
         mLatinIME = latinIME;
         mPrefs = PreferenceManager.getDefaultSharedPreferences(latinIME);
@@ -249,7 +240,7 @@
                 System.currentTimeMillis(), System.nanoTime()), mLatinIME);
         final int numWordsToIgnore = new Random().nextInt(NUMBER_OF_WORDS_BETWEEN_SAMPLES + 1);
         mMainLogBuffer = new MainLogBuffer(NUMBER_OF_WORDS_BETWEEN_SAMPLES, numWordsToIgnore,
-                mSuggest) {
+                mDictionaryFacilitator) {
             @Override
             protected void publish(final ArrayList<LogUnit> logUnits,
                     boolean canIncludePrivateData) {
@@ -262,10 +253,10 @@
                                 + ", cipd: " + canIncludePrivateData);
                     }
                     for (final String word : logUnit.getWordsAsStringArray()) {
-                        final Dictionary dictionary = getDictionary();
+                        final boolean isDictionaryWord = mDictionaryFacilitator != null
+                                && mDictionaryFacilitator.isValidMainDictWord(word);
                         mStatistics.recordWordEntered(
-                                dictionary != null && dictionary.isValidWord(word),
-                                logUnit.containsUserDeletions());
+                                isDictionaryWord, logUnit.containsUserDeletions());
                     }
                 }
                 publishLogUnits(logUnits, mMainResearchLog, canIncludePrivateData);
@@ -663,8 +654,8 @@
         mInFeedbackDialog = false;
     }
 
-    public void initSuggest(final Suggest suggest) {
-        mSuggest = suggest;
+    public void initDictionary(final DictionaryFacilitatorForSuggest dictionaryFacilitator) {
+        mDictionaryFacilitator = dictionaryFacilitator;
         // MainLogBuffer now has an out-of-date Suggest object.  Close down MainLogBuffer and create
         // a new one.
         if (mMainLogBuffer != null) {
@@ -672,13 +663,6 @@
         }
     }
 
-    private Dictionary getDictionary() {
-        if (mSuggest == null) {
-            return null;
-        }
-        return mSuggest.getMainDictionary();
-    }
-
     private void setIsPasswordView(boolean isPasswordView) {
         mIsPasswordView = isPasswordView;
     }
@@ -972,11 +956,7 @@
     }
 
     private String scrubWord(String word) {
-        final Dictionary dictionary = getDictionary();
-        if (dictionary == null) {
-            return WORD_REPLACEMENT_STRING;
-        }
-        if (dictionary.isValidWord(word)) {
+        if (mDictionaryFacilitator != null && mDictionaryFacilitator.isValidMainDictWord(word)) {
             return word;
         }
         return WORD_REPLACEMENT_STRING;
@@ -1126,12 +1106,6 @@
                 new Object[] { applicationSpecifiedCompletions });
     }
 
-    public static boolean getAndClearLatinIMEExpectingUpdateSelection() {
-        boolean returnValue = sLatinIMEExpectingUpdateSelection;
-        sLatinIMEExpectingUpdateSelection = false;
-        return returnValue;
-    }
-
     /**
      * The IME is finishing; it is either being destroyed, or is about to be hidden.
      *
@@ -1149,51 +1123,12 @@
         // if called from finishViews(), which is called from hideWindow() and onDestroy().  These
         // are the situations in which we want to finish up the researchLog.
         if (ic != null && !finishingInput) {
-            final boolean isTextTruncated;
-            final String text;
-            if (LOG_FULL_TEXTVIEW_CONTENTS) {
-                // Capture the TextView contents.  This will trigger onUpdateSelection(), so we
-                // set sLatinIMEExpectingUpdateSelection so that when onUpdateSelection() is called,
-                // it can tell that it was generated by the logging code, and not by the user, and
-                // therefore keep user-visible state as is.
-                ic.beginBatchEdit();
-                ic.performContextMenuAction(android.R.id.selectAll);
-                CharSequence charSequence = ic.getSelectedText(0);
-                if (savedSelectionStart != -1 && savedSelectionEnd != -1) {
-                    ic.setSelection(savedSelectionStart, savedSelectionEnd);
-                }
-                ic.endBatchEdit();
-                sLatinIMEExpectingUpdateSelection = true;
-                if (TextUtils.isEmpty(charSequence)) {
-                    isTextTruncated = false;
-                    text = "";
-                } else {
-                    if (charSequence.length() > MAX_INPUTVIEW_LENGTH_TO_CAPTURE) {
-                        int length = MAX_INPUTVIEW_LENGTH_TO_CAPTURE;
-                        // do not cut in the middle of a supplementary character
-                        final char c = charSequence.charAt(length - 1);
-                        if (Character.isHighSurrogate(c)) {
-                            length--;
-                        }
-                        final CharSequence truncatedCharSequence = charSequence.subSequence(0,
-                                length);
-                        isTextTruncated = true;
-                        text = truncatedCharSequence.toString();
-                    } else {
-                        isTextTruncated = false;
-                        text = charSequence.toString();
-                    }
-                }
-            } else {
-                isTextTruncated = true;
-                text = "";
-            }
             final ResearchLogger researchLogger = getInstance();
             // Assume that OUTPUT_ENTIRE_BUFFER is only true when we don't care about privacy (e.g.
             // during a live user test), so the normal isPotentiallyPrivate and
             // isPotentiallyRevealing flags do not apply
             researchLogger.enqueueEvent(LOGSTATEMENT_LATINIME_ONFINISHINPUTVIEWINTERNAL,
-                    isTextTruncated, text);
+                    true /* isTextTruncated */, "" /* text */);
             researchLogger.commitCurrentLogUnit();
             getInstance().stop();
         }
@@ -1213,9 +1148,7 @@
     public static void latinIME_onUpdateSelection(final int lastSelectionStart,
             final int lastSelectionEnd, final int oldSelStart, final int oldSelEnd,
             final int newSelStart, final int newSelEnd, final int composingSpanStart,
-            final int composingSpanEnd, final boolean expectingUpdateSelection,
-            final boolean expectingUpdateSelectionFromLogger,
-            final RichInputConnection connection) {
+            final int composingSpanEnd, final RichInputConnection connection) {
         String word = "";
         if (connection != null) {
             TextRange range = connection.getWordRangeAtCursor(WHITESPACE_SEPARATORS, 1);
@@ -1227,8 +1160,8 @@
         final String scrubbedWord = researchLogger.scrubWord(word);
         researchLogger.enqueueEvent(LOGSTATEMENT_LATINIME_ONUPDATESELECTION, lastSelectionStart,
                 lastSelectionEnd, oldSelStart, oldSelEnd, newSelStart, newSelEnd,
-                composingSpanStart, composingSpanEnd, expectingUpdateSelection,
-                expectingUpdateSelectionFromLogger, scrubbedWord);
+                composingSpanStart, composingSpanEnd, false /* expectingUpdateSelection */,
+                false /* expectingUpdateSelectionFromLogger */, scrubbedWord);
     }
 
     /**
@@ -1411,8 +1344,9 @@
     private static final LogStatement LOGSTATEMENT_MAINKEYBOARDVIEW_SETKEYBOARD =
             new LogStatement("MainKeyboardViewSetKeyboard", false, false, "elementId", "locale",
                     "orientation", "width", "modeName", "action", "navigateNext",
-                    "navigatePrevious", "clobberSettingsKey", "passwordInput", "shortcutKeyEnabled",
-                    "hasShortcutKey", "languageSwitchKeyEnabled", "isMultiLine", "tw", "th",
+                    "navigatePrevious", "clobberSettingsKey", "passwordInput",
+                    "supportsSwitchingToShortcutIme", "hasShortcutKey", "languageSwitchKeyEnabled",
+                    "isMultiLine", "tw", "th",
                     "keys");
     public static void mainKeyboardView_setKeyboard(final Keyboard keyboard,
             final int orientation) {
@@ -1425,7 +1359,7 @@
                 kid.mLocale + ":" + kid.mSubtype.getExtraValueOf(KEYBOARD_LAYOUT_SET),
                 orientation, kid.mWidth, KeyboardId.modeName(kid.mMode), kid.imeAction(),
                 kid.navigateNext(), kid.navigatePrevious(), kid.mClobberSettingsKey,
-                isPasswordView, kid.mShortcutKeyEnabled, kid.mHasShortcutKey,
+                isPasswordView, kid.mSupportsSwitchingToShortcutIme, kid.mHasShortcutKey,
                 kid.mLanguageSwitchKeyEnabled, kid.isMultiLine(), keyboard.mOccupiedWidth,
                 keyboard.mOccupiedHeight, keyboard.getKeys());
     }
diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index ca6a779..3b3da96 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -28,7 +28,8 @@
 LOCAL_C_INCLUDES += $(LOCAL_PATH)/$(LATIN_IME_SRC_DIR)
 
 LOCAL_CFLAGS += -Werror -Wall -Wextra -Weffc++ -Wformat=2 -Wcast-qual -Wcast-align \
-    -Wwrite-strings -Wfloat-equal -Wpointer-arith -Winit-self -Wredundant-decls -Wno-system-headers
+    -Wwrite-strings -Wfloat-equal -Wpointer-arith -Winit-self -Wredundant-decls \
+    -Woverloaded-virtual -Wstrict-null-sentinel -Wsign-promo -Wno-system-headers
 
 ifeq ($(TARGET_ARCH), arm)
 ifeq ($(TARGET_GCC_VERSION), 4.6)
@@ -39,66 +40,7 @@
 # To suppress compiler warnings for unused variables/functions used for debug features etc.
 LOCAL_CFLAGS += -Wno-unused-parameter -Wno-unused-function
 
-LATIN_IME_JNI_SRC_FILES := \
-    com_android_inputmethod_keyboard_ProximityInfo.cpp \
-    com_android_inputmethod_latin_BinaryDictionary.cpp \
-    com_android_inputmethod_latin_DicTraverseSession.cpp \
-    com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp \
-    jni_common.cpp
-
-LATIN_IME_CORE_SRC_FILES := \
-    suggest/core/suggest.cpp \
-    $(addprefix suggest/core/dicnode/, \
-        dic_node.cpp \
-        dic_node_utils.cpp \
-        dic_nodes_cache.cpp) \
-    $(addprefix suggest/core/dictionary/, \
-        bigram_dictionary.cpp \
-        bloom_filter.cpp \
-        dictionary.cpp \
-        digraph_utils.cpp \
-        multi_bigram_map.cpp) \
-    $(addprefix suggest/core/layout/, \
-        additional_proximity_chars.cpp \
-        proximity_info.cpp \
-        proximity_info_params.cpp \
-        proximity_info_state.cpp \
-        proximity_info_state_utils.cpp) \
-    suggest/core/policy/weighting.cpp \
-    suggest/core/session/dic_traverse_session.cpp \
-    $(addprefix suggest/policyimpl/dictionary/, \
-        bigram/bigram_list_read_write_utils.cpp \
-        bigram/dynamic_bigram_list_policy.cpp \
-        header/header_policy.cpp \
-        header/header_read_write_utils.cpp \
-        shortcut/shortcut_list_reading_utils.cpp \
-        dictionary_structure_with_buffer_policy_factory.cpp \
-        dynamic_patricia_trie_gc_event_listeners.cpp \
-        dynamic_patricia_trie_node_reader.cpp \
-        dynamic_patricia_trie_policy.cpp \
-        dynamic_patricia_trie_reading_helper.cpp \
-        dynamic_patricia_trie_reading_utils.cpp \
-        dynamic_patricia_trie_writing_helper.cpp \
-        dynamic_patricia_trie_writing_utils.cpp \
-        patricia_trie_policy.cpp \
-        patricia_trie_reading_utils.cpp) \
-    $(addprefix suggest/policyimpl/dictionary/utils/, \
-        buffer_with_extendable_buffer.cpp \
-        byte_array_utils.cpp \
-        dict_file_writing_utils.cpp \
-        forgetting_curve_utils.cpp \
-        format_utils.cpp) \
-    suggest/policyimpl/gesture/gesture_suggest_policy_factory.cpp \
-    $(addprefix suggest/policyimpl/typing/, \
-        scoring_params.cpp \
-        typing_scoring.cpp \
-        typing_suggest_policy.cpp \
-        typing_traversal.cpp \
-        typing_weighting.cpp) \
-    $(addprefix utils/, \
-        autocorrection_threshold_utils.cpp \
-        char_utils.cpp \
-        log_utils.cpp)
+include $(LOCAL_PATH)/NativeFileList.mk
 
 LOCAL_SRC_FILES := \
     $(LATIN_IME_JNI_SRC_FILES) \
@@ -151,6 +93,4 @@
 include $(BUILD_SHARED_LIBRARY)
 
 #################### Clean up the tmp vars
-LATIN_IME_CORE_SRC_FILES :=
-LATIN_IME_JNI_SRC_FILES :=
-LATIN_IME_SRC_DIR :=
+include $(LOCAL_PATH)/CleanupNativeFileList.mk
diff --git a/native/jni/CleanupNativeFileList.mk b/native/jni/CleanupNativeFileList.mk
new file mode 100644
index 0000000..5420f16
--- /dev/null
+++ b/native/jni/CleanupNativeFileList.mk
@@ -0,0 +1,17 @@
+# Copyright (C) 2013 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LATIN_IME_CORE_SRC_FILES :=
+LATIN_IME_JNI_SRC_FILES :=
+LATIN_IME_SRC_DIR :=
diff --git a/native/jni/NativeFileList.mk b/native/jni/NativeFileList.mk
new file mode 100644
index 0000000..d2f2259
--- /dev/null
+++ b/native/jni/NativeFileList.mk
@@ -0,0 +1,95 @@
+# Copyright (C) 2013 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+LATIN_IME_JNI_SRC_FILES := \
+    com_android_inputmethod_keyboard_ProximityInfo.cpp \
+    com_android_inputmethod_latin_BinaryDictionary.cpp \
+    com_android_inputmethod_latin_DicTraverseSession.cpp \
+    jni_common.cpp
+
+LATIN_IME_CORE_SRC_FILES := \
+    suggest/core/suggest.cpp \
+    $(addprefix suggest/core/dicnode/, \
+        dic_node.cpp \
+        dic_node_utils.cpp \
+        dic_nodes_cache.cpp) \
+    $(addprefix suggest/core/dictionary/, \
+        bigram_dictionary.cpp \
+        bloom_filter.cpp \
+        dictionary.cpp \
+        digraph_utils.cpp \
+        error_type_utils.cpp \
+        multi_bigram_map.cpp \
+        suggestions_output_utils.cpp \
+        unigram_property.cpp) \
+    $(addprefix suggest/core/layout/, \
+        additional_proximity_chars.cpp \
+        proximity_info.cpp \
+        proximity_info_params.cpp \
+        proximity_info_state.cpp \
+        proximity_info_state_utils.cpp) \
+    suggest/core/policy/weighting.cpp \
+    suggest/core/session/dic_traverse_session.cpp \
+    $(addprefix suggest/policyimpl/dictionary/, \
+        header/header_policy.cpp \
+        header/header_read_write_utils.cpp \
+        shortcut/shortcut_list_reading_utils.cpp \
+        structure/dictionary_structure_with_buffer_policy_factory.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/bigram/, \
+        bigram_list_read_write_utils.cpp \
+        ver4_bigram_list_policy.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/pt_common/, \
+        dynamic_pt_gc_event_listeners.cpp \
+        dynamic_pt_reading_helper.cpp \
+        dynamic_pt_reading_utils.cpp \
+        dynamic_pt_updating_helper.cpp \
+        dynamic_pt_writing_utils.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/v2/, \
+        patricia_trie_policy.cpp \
+        patricia_trie_reading_utils.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/v4/, \
+        ver4_dict_buffers.cpp \
+        ver4_dict_constants.cpp \
+        ver4_patricia_trie_node_reader.cpp \
+        ver4_patricia_trie_node_writer.cpp \
+        ver4_patricia_trie_policy.cpp \
+        ver4_patricia_trie_reading_utils.cpp \
+        ver4_patricia_trie_writing_helper.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/structure/v4/content/, \
+        bigram_dict_content.cpp \
+        probability_dict_content.cpp \
+        shortcut_dict_content.cpp \
+        sparse_table_dict_content.cpp \
+        terminal_position_lookup_table.cpp) \
+    $(addprefix suggest/policyimpl/dictionary/utils/, \
+        buffer_with_extendable_buffer.cpp \
+        byte_array_utils.cpp \
+        dict_file_writing_utils.cpp \
+        file_utils.cpp \
+        forgetting_curve_utils.cpp \
+        format_utils.cpp \
+        mmapped_buffer.cpp \
+        sparse_table.cpp) \
+    suggest/policyimpl/gesture/gesture_suggest_policy_factory.cpp \
+    $(addprefix suggest/policyimpl/typing/, \
+        scoring_params.cpp \
+        typing_scoring.cpp \
+        typing_suggest_policy.cpp \
+        typing_traversal.cpp \
+        typing_weighting.cpp) \
+    $(addprefix utils/, \
+        autocorrection_threshold_utils.cpp \
+        char_utils.cpp \
+        log_utils.cpp \
+        time_keeper.cpp)
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 8f21c50..716bda5 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -24,8 +24,9 @@
 #include "jni.h"
 #include "jni_common.h"
 #include "suggest/core/dictionary/dictionary.h"
+#include "suggest/core/dictionary/unigram_property.h"
 #include "suggest/core/suggest_options.h"
-#include "suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.h"
+#include "suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.h"
 #include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
 #include "utils/autocorrection_threshold_utils.h"
 
@@ -86,11 +87,11 @@
     char sourceDirChars[sourceDirUtf8Length + 1];
     env->GetStringUTFRegion(sourceDir, 0, env->GetStringLength(sourceDir), sourceDirChars);
     sourceDirChars[sourceDirUtf8Length] = '\0';
-    DictionaryStructureWithBufferPolicy *const dictionaryStructureWithBufferPolicy =
+    DictionaryStructureWithBufferPolicy::StructurePolicyPtr dictionaryStructureWithBufferPolicy =
             DictionaryStructureWithBufferPolicyFactory::newDictionaryStructureWithBufferPolicy(
                     sourceDirChars, static_cast<int>(dictOffset), static_cast<int>(dictSize),
                     isUpdatable == JNI_TRUE);
-    if (!dictionaryStructureWithBufferPolicy) {
+    if (!dictionaryStructureWithBufferPolicy.get()) {
         return 0;
     }
 
@@ -135,6 +136,12 @@
     delete dictionary;
 }
 
+static int latinime_BinaryDictionary_getFormatVersion(JNIEnv *env, jclass clazz, jlong dict) {
+    Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
+    if (!dictionary) return 0;
+    return dictionary->getFormatVersionNumber();
+}
+
 static int latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jclass clazz, jlong dict,
         jlong proximityInfo, jlong dicTraverseSession, jintArray xCoordinatesArray,
         jintArray yCoordinatesArray, jintArray timesArray, jintArray pointerIdsArray,
@@ -252,6 +259,21 @@
             word1Length);
 }
 
+static void latinime_BinaryDictionary_getUnigramProperty(JNIEnv *env, jclass clazz,
+        jlong dict, jintArray word, jintArray outCodePoints, jbooleanArray outFlags,
+        jintArray outProbability, jintArray outHistoricalInfo, jobject outShortcutTargets,
+        jobject outShortcutProbabilities) {
+    Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
+    if (!dictionary) return;
+    const jsize wordLength = env->GetArrayLength(word);
+    int wordCodePoints[wordLength];
+    env->GetIntArrayRegion(word, 0, wordLength, wordCodePoints);
+    const UnigramProperty unigramProperty = dictionary->getUnigramProperty(
+            wordCodePoints, wordLength);
+    unigramProperty.outputProperties(env, outCodePoints, outFlags, outProbability,
+            outHistoricalInfo, outShortcutTargets, outShortcutProbabilities);
+}
+
 static jfloat latinime_BinaryDictionary_calcNormalizedScore(JNIEnv *env, jclass clazz,
         jintArray before, jintArray after, jint score) {
     jsize beforeLength = env->GetArrayLength(before);
@@ -277,7 +299,8 @@
 }
 
 static void latinime_BinaryDictionary_addUnigramWord(JNIEnv *env, jclass clazz, jlong dict,
-        jintArray word, jint probability) {
+        jintArray word, jint probability, jintArray shortcutTarget, jint shortuctProbability,
+        jboolean isNotAWord, jboolean isBlacklisted, jint timestamp) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
     if (!dictionary) {
         return;
@@ -285,11 +308,17 @@
     jsize wordLength = env->GetArrayLength(word);
     int codePoints[wordLength];
     env->GetIntArrayRegion(word, 0, wordLength, codePoints);
-    dictionary->addUnigramWord(codePoints, wordLength, probability);
+    jsize shortcutLength = shortcutTarget ? env->GetArrayLength(shortcutTarget) : 0;
+    int shortcutTargetCodePoints[shortcutLength];
+    if (shortcutTarget) {
+        env->GetIntArrayRegion(shortcutTarget, 0, shortcutLength, shortcutTargetCodePoints);
+    }
+    dictionary->addUnigramWord(codePoints, wordLength, probability, shortcutTargetCodePoints,
+            shortcutLength, shortuctProbability, isNotAWord, isBlacklisted, timestamp);
 }
 
 static void latinime_BinaryDictionary_addBigramWords(JNIEnv *env, jclass clazz, jlong dict,
-        jintArray word0, jintArray word1, jint probability) {
+        jintArray word0, jintArray word1, jint probability, jint timestamp) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
     if (!dictionary) {
         return;
@@ -301,7 +330,7 @@
     int word1CodePoints[word1Length];
     env->GetIntArrayRegion(word1, 0, word1Length, word1CodePoints);
     dictionary->addBigramWords(word0CodePoints, word0Length, word1CodePoints,
-            word1Length, probability);
+            word1Length, probability, timestamp);
 }
 
 static void latinime_BinaryDictionary_removeBigramWords(JNIEnv *env, jclass clazz, jlong dict,
@@ -320,6 +349,87 @@
             word1Length);
 }
 
+// Returns how many language model params are processed.
+static int latinime_BinaryDictionary_addMultipleDictionaryEntries(JNIEnv *env, jclass clazz,
+        jlong dict, jobjectArray languageModelParams, jint startIndex) {
+    Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
+    if (!dictionary) {
+        return 0;
+    }
+    jsize languageModelParamCount = env->GetArrayLength(languageModelParams);
+    if (languageModelParamCount == 0 || startIndex >= languageModelParamCount) {
+        return 0;
+    }
+    jobject languageModelParam = env->GetObjectArrayElement(languageModelParams, 0);
+    jclass languageModelParamClass = env->GetObjectClass(languageModelParam);
+    env->DeleteLocalRef(languageModelParam);
+
+    jfieldID word0FieldId = env->GetFieldID(languageModelParamClass, "mWord0", "[I");
+    jfieldID word1FieldId = env->GetFieldID(languageModelParamClass, "mWord1", "[I");
+    jfieldID unigramProbabilityFieldId =
+            env->GetFieldID(languageModelParamClass, "mUnigramProbability", "I");
+    jfieldID bigramProbabilityFieldId =
+            env->GetFieldID(languageModelParamClass, "mBigramProbability", "I");
+    jfieldID timestampFieldId =
+            env->GetFieldID(languageModelParamClass, "mTimestamp", "I");
+    jfieldID shortcutTargetFieldId =
+            env->GetFieldID(languageModelParamClass, "mShortcutTarget", "[I");
+    jfieldID shortcutProbabilityFieldId =
+            env->GetFieldID(languageModelParamClass, "mShortcutProbability", "I");
+    jfieldID isNotAWordFieldId =
+            env->GetFieldID(languageModelParamClass, "mIsNotAWord", "Z");
+    jfieldID isBlacklistedFieldId =
+            env->GetFieldID(languageModelParamClass, "mIsBlacklisted", "Z");
+    env->DeleteLocalRef(languageModelParamClass);
+
+    for (int i = startIndex; i < languageModelParamCount; ++i) {
+        jobject languageModelParam = env->GetObjectArrayElement(languageModelParams, i);
+        // languageModelParam is a set of params for word1; thus, word1 cannot be null. On the
+        // other hand, word0 can be null and then it means the set of params doesn't contain bigram
+        // information.
+        jintArray word0 = static_cast<jintArray>(
+                env->GetObjectField(languageModelParam, word0FieldId));
+        jsize word0Length = word0 ? env->GetArrayLength(word0) : 0;
+        int word0CodePoints[word0Length];
+        if (word0) {
+            env->GetIntArrayRegion(word0, 0, word0Length, word0CodePoints);
+        }
+        jintArray word1 = static_cast<jintArray>(
+                env->GetObjectField(languageModelParam, word1FieldId));
+        jsize word1Length = env->GetArrayLength(word1);
+        int word1CodePoints[word1Length];
+        env->GetIntArrayRegion(word1, 0, word1Length, word1CodePoints);
+        jint unigramProbability = env->GetIntField(languageModelParam, unigramProbabilityFieldId);
+        jint timestamp = env->GetIntField(languageModelParam, timestampFieldId);
+        jboolean isNotAWord = env->GetBooleanField(languageModelParam, isNotAWordFieldId);
+        jboolean isBlacklisted = env->GetBooleanField(languageModelParam, isBlacklistedFieldId);
+        jintArray shortcutTarget = static_cast<jintArray>(
+                env->GetObjectField(languageModelParam, shortcutTargetFieldId));
+        jsize shortcutLength = shortcutTarget ? env->GetArrayLength(shortcutTarget) : 0;
+        int shortcutTargetCodePoints[shortcutLength];
+        if (shortcutTarget) {
+            env->GetIntArrayRegion(shortcutTarget, 0, shortcutLength, shortcutTargetCodePoints);
+        }
+        jint shortcutProbability = env->GetIntField(languageModelParam, shortcutProbabilityFieldId);
+        dictionary->addUnigramWord(word1CodePoints, word1Length, unigramProbability,
+                shortcutTargetCodePoints, shortcutLength, shortcutProbability,
+                isNotAWord, isBlacklisted, timestamp);
+        if (word0) {
+            jint bigramProbability = env->GetIntField(languageModelParam, bigramProbabilityFieldId);
+            dictionary->addBigramWords(word0CodePoints, word0Length, word1CodePoints, word1Length,
+                    bigramProbability, timestamp);
+        }
+        if (dictionary->needsToRunGC(true /* mindsBlockByGC */)) {
+            return i + 1;
+        }
+        env->DeleteLocalRef(word0);
+        env->DeleteLocalRef(word1);
+        env->DeleteLocalRef(shortcutTarget);
+        env->DeleteLocalRef(languageModelParam);
+    }
+    return languageModelParamCount;
+}
+
 static int latinime_BinaryDictionary_calculateProbabilityNative(JNIEnv *env, jclass clazz,
         jlong dict, jint unigramProbability, jint bigramProbability) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
@@ -343,7 +453,7 @@
     static const int GET_PROPERTY_RESULT_LENGTH = 100;
     char resultChars[GET_PROPERTY_RESULT_LENGTH];
     resultChars[0] = '\0';
-    dictionary->getProperty(queryChars, resultChars, GET_PROPERTY_RESULT_LENGTH);
+    dictionary->getProperty(queryChars, queryUtf8Length, resultChars, GET_PROPERTY_RESULT_LENGTH);
     return env->NewStringUTF(resultChars);
 }
 
@@ -364,6 +474,11 @@
         reinterpret_cast<void *>(latinime_BinaryDictionary_close)
     },
     {
+        const_cast<char *>("getFormatVersionNative"),
+        const_cast<char *>("(J)I"),
+        reinterpret_cast<void *>(latinime_BinaryDictionary_getFormatVersion)
+    },
+    {
         const_cast<char *>("flushNative"),
         const_cast<char *>("(JLjava/lang/String;)V"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_flush)
@@ -394,6 +509,11 @@
         reinterpret_cast<void *>(latinime_BinaryDictionary_getBigramProbability)
     },
     {
+        const_cast<char *>("getUnigramPropertyNative"),
+        const_cast<char *>("(J[I[I[Z[I[ILjava/util/ArrayList;Ljava/util/ArrayList;)V"),
+        reinterpret_cast<void *>(latinime_BinaryDictionary_getUnigramProperty)
+    },
+    {
         const_cast<char *>("calcNormalizedScoreNative"),
         const_cast<char *>("([I[II)F"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_calcNormalizedScore)
@@ -405,12 +525,12 @@
     },
     {
         const_cast<char *>("addUnigramWordNative"),
-        const_cast<char *>("(J[II)V"),
+        const_cast<char *>("(J[II[IIZZI)V"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_addUnigramWord)
     },
     {
         const_cast<char *>("addBigramWordsNative"),
-        const_cast<char *>("(J[I[II)V"),
+        const_cast<char *>("(J[I[III)V"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_addBigramWords)
     },
     {
@@ -419,6 +539,12 @@
         reinterpret_cast<void *>(latinime_BinaryDictionary_removeBigramWords)
     },
     {
+        const_cast<char *>("addMultipleDictionaryEntriesNative"),
+        const_cast<char *>(
+                "(J[Lcom/android/inputmethod/latin/BinaryDictionary$LanguageModelParam;I)I"),
+        reinterpret_cast<void *>(latinime_BinaryDictionary_addMultipleDictionaryEntries)
+    },
+    {
         const_cast<char *>("calculateProbabilityNative"),
         const_cast<char *>("(JII)I"),
         reinterpret_cast<void *>(latinime_BinaryDictionary_calculateProbabilityNative)
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp b/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp
deleted file mode 100644
index 15088b6..0000000
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#define LOG_TAG "LatinIME: jni: Ver3DictDecoder"
-
-#include "com_android_inputmethod_latin_makedict_Ver3DictDecoder.h"
-
-#include "defines.h"
-#include "jni.h"
-#include "jni_common.h"
-
-namespace latinime {
-static int latinime_Ver3DictDecoder_doNothing(JNIEnv *env, jclass clazz) {
-    // This is a phony method for test - it does nothing. It just returns some value
-    // unlikely to be in memory by chance for testing purposes.
-    // TODO: remove this method.
-    return 2097;
-}
-
-static const JNINativeMethod sMethods[] = {
-    {
-        // TODO: remove this entry when we have one useful method in here
-        const_cast<char *>("doNothing"),
-        const_cast<char *>("()I"),
-        reinterpret_cast<void *>(latinime_Ver3DictDecoder_doNothing)
-    },
-};
-
-int register_Ver3DictDecoder(JNIEnv *env) {
-    const char *const kClassPathName =
-            "com/android/inputmethod/latin/makedict/Ver3DictDecoder";
-    return registerNativeMethods(env, kClassPathName, sMethods, NELEMS(sMethods));
-}
-} // namespace latinime
diff --git a/native/jni/jni_common.cpp b/native/jni/jni_common.cpp
index 3a8f436..f2867d7 100644
--- a/native/jni/jni_common.cpp
+++ b/native/jni/jni_common.cpp
@@ -18,12 +18,9 @@
 
 #include "jni_common.h"
 
-#ifndef HOST_TOOL
 #include "com_android_inputmethod_keyboard_ProximityInfo.h"
 #include "com_android_inputmethod_latin_BinaryDictionary.h"
 #include "com_android_inputmethod_latin_DicTraverseSession.h"
-#endif
-#include "com_android_inputmethod_latin_makedict_Ver3DictDecoder.h"
 #include "defines.h"
 
 /*
@@ -41,7 +38,6 @@
         AKLOGE("ERROR: JNIEnv is invalid");
         return -1;
     }
-#ifndef HOST_TOOL
     if (!latinime::register_BinaryDictionary(env)) {
         AKLOGE("ERROR: BinaryDictionary native registration failed");
         return -1;
@@ -54,11 +50,6 @@
         AKLOGE("ERROR: ProximityInfo native registration failed");
         return -1;
     }
-#endif
-    if (!latinime::register_Ver3DictDecoder(env)) {
-        AKLOGE("ERROR: Ver3DictDecoder native registration failed");
-        return -1;
-    }
     /* success -- return valid version number */
     return JNI_VERSION_1_6;
 }
diff --git a/native/jni/src/defines.h b/native/jni/src/defines.h
index 742e388..1969eba 100644
--- a/native/jni/src/defines.h
+++ b/native/jni/src/defines.h
@@ -87,12 +87,21 @@
 }
 
 #if defined(FLAG_DO_PROFILE) || defined(FLAG_DBG)
+#if defined(__ANDROID__)
 #include <android/log.h>
+#endif // defined(__ANDROID__)
 #ifndef LOG_TAG
 #define LOG_TAG "LatinIME: "
 #endif // LOG_TAG
+
+#if defined(HOST_TOOL)
+#include <stdio.h>
+#define AKLOGE(fmt, ...) printf(fmt "\n", ##__VA_ARGS__)
+#define AKLOGI(fmt, ...) printf(fmt "\n", ##__VA_ARGS__)
+#else // defined(HOST_TOOL)
 #define AKLOGE(fmt, ...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, fmt, ##__VA_ARGS__)
 #define AKLOGI(fmt, ...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, fmt, ##__VA_ARGS__)
+#endif // defined(HOST_TOOL)
 
 #define DUMP_RESULT(words, frequencies) do { dumpResult(words, frequencies); } while (0)
 #define DUMP_WORD(word, length) do { dumpWord(word, length); } while (0)
@@ -298,6 +307,7 @@
 #define NOT_AN_INDEX (-1)
 #define NOT_A_PROBABILITY (-1)
 #define NOT_A_DICT_POS (S_INT_MIN)
+#define NOT_A_TIMESTAMP (-1)
 
 // A special value to mean the first word confidence makes no sense in this case,
 // e.g. this is not a multi-word suggestion.
@@ -341,12 +351,21 @@
 #define INPUTLENGTH_FOR_DEBUG (-1)
 #define MIN_OUTPUT_INDEX_FOR_DEBUG (-1)
 
-#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
-  TypeName(const TypeName&);               \
+#define DISALLOW_DEFAULT_CONSTRUCTOR(TypeName) \
+  TypeName()
+
+#define DISALLOW_COPY_CONSTRUCTOR(TypeName) \
+  TypeName(const TypeName&)
+
+#define DISALLOW_ASSIGNMENT_OPERATOR(TypeName) \
   void operator=(const TypeName&)
 
+#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
+  DISALLOW_COPY_CONSTRUCTOR(TypeName);     \
+  DISALLOW_ASSIGNMENT_OPERATOR(TypeName)
+
 #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
-  TypeName();                                    \
+  DISALLOW_DEFAULT_CONSTRUCTOR(TypeName);        \
   DISALLOW_COPY_AND_ASSIGN(TypeName)
 
 // Used as a return value for character comparison
@@ -392,24 +411,4 @@
     // Create new word with space substitution
     CT_NEW_WORD_SPACE_SUBSTITUTION,
 } CorrectionType;
-
-// ErrorType is mainly decided by CorrectionType but it is also depending on if
-// the correction has really been performed or not.
-typedef enum {
-    // Substitution, omission and transposition
-    ET_EDIT_CORRECTION,
-    // Proximity error
-    ET_PROXIMITY_CORRECTION,
-    // Completion
-    ET_COMPLETION,
-    // New word
-    // TODO: Remove.
-    // A new word error should be an edit correction error or a proximity correction error.
-    ET_NEW_WORD,
-    // Treat error as an intentional omission when the CorrectionType is omission and the node can
-    // be intentional omission.
-    ET_INTENTIONAL_OMISSION,
-    // Not treated as an error. Tracked for checking exact match
-    ET_NOT_AN_ERROR
-} ErrorType;
 #endif // LATINIME_DEFINES_H
diff --git a/native/jni/src/suggest/core/dicnode/dic_node.h b/native/jni/src/suggest/core/dicnode/dic_node.h
index 49cfdec..558667e 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node.h
@@ -23,6 +23,7 @@
 #include "suggest/core/dicnode/internal/dic_node_state.h"
 #include "suggest/core/dicnode/internal/dic_node_properties.h"
 #include "suggest/core/dictionary/digraph_utils.h"
+#include "suggest/core/dictionary/error_type_utils.h"
 #include "utils/char_utils.h"
 
 #if DEBUG_DICT
@@ -99,7 +100,7 @@
     virtual ~DicNode() {}
 
     // Init for copy
-    void initByCopy(const DicNode *dicNode) {
+    void initByCopy(const DicNode *const dicNode) {
         mIsUsed = true;
         mIsCachedForNextSuggestion = dicNode->mIsCachedForNextSuggestion;
         mDicNodeProperties.init(&dicNode->mDicNodeProperties);
@@ -107,25 +108,25 @@
         PROF_NODE_COPY(&dicNode->mProfiler, mProfiler);
     }
 
-    // Init for root with prevWordNodePos which is used for bigram
-    void initAsRoot(const int rootGroupPos, const int prevWordNodePos) {
+    // Init for root with prevWordPtNodePos which is used for bigram
+    void initAsRoot(const int rootPtNodeArrayPos, const int prevWordPtNodePos) {
         mIsUsed = true;
         mIsCachedForNextSuggestion = false;
         mDicNodeProperties.init(
-                NOT_A_DICT_POS /* pos */, rootGroupPos, NOT_A_CODE_POINT /* nodeCodePoint */,
+                NOT_A_DICT_POS /* pos */, rootPtNodeArrayPos, NOT_A_CODE_POINT /* nodeCodePoint */,
                 NOT_A_PROBABILITY /* probability */, false /* isTerminal */,
                 true /* hasChildren */, false /* isBlacklistedOrNotAWord */, 0 /* depth */,
                 0 /* terminalDepth */);
-        mDicNodeState.init(prevWordNodePos);
+        mDicNodeState.init(prevWordPtNodePos);
         PROF_NODE_RESET(mProfiler);
     }
 
     // Init for root with previous word
-    void initAsRootWithPreviousWord(DicNode *dicNode, const int rootGroupPos) {
+    void initAsRootWithPreviousWord(const DicNode *const dicNode, const int rootPtNodeArrayPos) {
         mIsUsed = true;
         mIsCachedForNextSuggestion = dicNode->mIsCachedForNextSuggestion;
         mDicNodeProperties.init(
-                NOT_A_DICT_POS /* pos */, rootGroupPos, NOT_A_CODE_POINT /* nodeCodePoint */,
+                NOT_A_DICT_POS /* pos */, rootPtNodeArrayPos, NOT_A_CODE_POINT /* nodeCodePoint */,
                 NOT_A_PROBABILITY /* probability */, false /* isTerminal */,
                 true /* hasChildren */, false /* isBlacklistedOrNotAWord */,  0 /* depth */,
                 0 /* terminalDepth */);
@@ -138,7 +139,7 @@
         mDicNodeState.mDicNodeStatePrevWord.init(
                 dicNode->mDicNodeState.mDicNodeStatePrevWord.getPrevWordCount() + 1,
                 dicNode->mDicNodeProperties.getProbability(),
-                dicNode->mDicNodeProperties.getPos(),
+                dicNode->mDicNodeProperties.getPtNodePos(),
                 dicNode->mDicNodeState.mDicNodeStatePrevWord.mPrevWord,
                 dicNode->mDicNodeState.mDicNodeStatePrevWord.getPrevWordLength(),
                 dicNode->getOutputWordBuf(),
@@ -148,26 +149,27 @@
         PROF_NODE_COPY(&dicNode->mProfiler, mProfiler);
     }
 
-    void initAsPassingChild(DicNode *parentNode) {
+    void initAsPassingChild(DicNode *parentDicNode) {
         mIsUsed = true;
-        mIsCachedForNextSuggestion = parentNode->mIsCachedForNextSuggestion;
-        const int c = parentNode->getNodeTypedCodePoint();
-        mDicNodeProperties.init(&parentNode->mDicNodeProperties, c);
-        mDicNodeState.init(&parentNode->mDicNodeState);
-        PROF_NODE_COPY(&parentNode->mProfiler, mProfiler);
+        mIsCachedForNextSuggestion = parentDicNode->mIsCachedForNextSuggestion;
+        const int parentCodePoint = parentDicNode->getNodeTypedCodePoint();
+        mDicNodeProperties.init(&parentDicNode->mDicNodeProperties, parentCodePoint);
+        mDicNodeState.init(&parentDicNode->mDicNodeState);
+        PROF_NODE_COPY(&parentDicNode->mProfiler, mProfiler);
     }
 
-    void initAsChild(const DicNode *const dicNode, const int pos, const int childrenPos,
-            const int probability, const bool isTerminal, const bool hasChildren,
-            const bool isBlacklistedOrNotAWord, const uint16_t mergedNodeCodePointCount,
-            const int *const mergedNodeCodePoints) {
+    void initAsChild(const DicNode *const dicNode, const int ptNodePos,
+            const int childrenPtNodeArrayPos, const int probability, const bool isTerminal,
+            const bool hasChildren, const bool isBlacklistedOrNotAWord,
+            const uint16_t mergedNodeCodePointCount, const int *const mergedNodeCodePoints) {
         mIsUsed = true;
         uint16_t newDepth = static_cast<uint16_t>(dicNode->getNodeCodePointCount() + 1);
         mIsCachedForNextSuggestion = dicNode->mIsCachedForNextSuggestion;
         const uint16_t newLeavingDepth = static_cast<uint16_t>(
                 dicNode->mDicNodeProperties.getLeavingDepth() + mergedNodeCodePointCount);
-        mDicNodeProperties.init(pos, childrenPos, mergedNodeCodePoints[0], probability,
-                isTerminal, hasChildren, isBlacklistedOrNotAWord, newDepth, newLeavingDepth);
+        mDicNodeProperties.init(ptNodePos, childrenPtNodeArrayPos, mergedNodeCodePoints[0],
+                probability, isTerminal, hasChildren, isBlacklistedOrNotAWord, newDepth,
+                newLeavingDepth);
         mDicNodeState.init(&dicNode->mDicNodeState, mergedNodeCodePointCount,
                 mergedNodeCodePoints);
         PROF_NODE_COPY(&dicNode->mProfiler, mProfiler);
@@ -234,7 +236,7 @@
     }
 
     bool isFirstWord() const {
-        return mDicNodeState.mDicNodeStatePrevWord.getPrevWordNodePos() == NOT_A_DICT_POS;
+        return mDicNodeState.mDicNodeStatePrevWord.getPrevWordPtNodePos() == NOT_A_DICT_POS;
     }
 
     bool isCompletion(const int inputSize) const {
@@ -246,29 +248,30 @@
     }
 
     // Used to get bigram probability in DicNodeUtils
-    int getPos() const {
-        return mDicNodeProperties.getPos();
+    int getPtNodePos() const {
+        return mDicNodeProperties.getPtNodePos();
     }
 
     // Used to get bigram probability in DicNodeUtils
-    int getPrevWordPos() const {
-        return mDicNodeState.mDicNodeStatePrevWord.getPrevWordNodePos();
+    int getPrevWordTerminalPtNodePos() const {
+        return mDicNodeState.mDicNodeStatePrevWord.getPrevWordPtNodePos();
     }
 
     // Used in DicNodeUtils
-    int getChildrenPos() const {
-        return mDicNodeProperties.getChildrenPos();
+    int getChildrenPtNodeArrayPos() const {
+        return mDicNodeProperties.getChildrenPtNodeArrayPos();
     }
 
     int getProbability() const {
         return mDicNodeProperties.getProbability();
     }
 
-    AK_FORCE_INLINE bool isTerminalWordNode() const {
-        const bool isTerminalNodes = mDicNodeProperties.isTerminal();
-        const int currentNodeDepth = getNodeCodePointCount();
-        const int terminalNodeDepth = mDicNodeProperties.getLeavingDepth();
-        return isTerminalNodes && currentNodeDepth > 0 && currentNodeDepth == terminalNodeDepth;
+    AK_FORCE_INLINE bool isTerminalDicNode() const {
+        const bool isTerminalPtNode = mDicNodeProperties.isTerminal();
+        const int currentDicNodeDepth = getNodeCodePointCount();
+        const int terminalDicNodeDepth = mDicNodeProperties.getLeavingDepth();
+        return isTerminalPtNode && currentDicNodeDepth > 0
+                && currentDicNodeDepth == terminalDicNodeDepth;
     }
 
     bool shouldBeFilteredBySafetyNetForBigram() const {
@@ -278,6 +281,13 @@
         return !(currentDepth > 0 && (currentDepth != 1 || prevWordLen != 1));
     }
 
+    bool hasMatchedOrProximityCodePoints() const {
+        // This DicNode does not have matched or proximity code points when all code points have
+        // been handled as edit corrections so far.
+        return mDicNodeState.mDicNodeStateScoring.getEditCorrectionCount()
+                < getNodeCodePointCount();
+    }
+
     bool isTotalInputSizeExceedingLimit() const {
         const int prevWordsLen = mDicNodeState.mDicNodeStatePrevWord.getPrevWordLength();
         const int currentWordDepth = getNodeCodePointCount();
@@ -374,8 +384,8 @@
     }
 
     // Used to commit input partially
-    int getPrevWordNodePos() const {
-        return mDicNodeState.mDicNodeStatePrevWord.getPrevWordNodePos();
+    int getPrevWordPtNodePos() const {
+        return mDicNodeState.mDicNodeStatePrevWord.getPrevWordPtNodePos();
     }
 
     AK_FORCE_INLINE const int *getOutputWordBuf() const {
@@ -410,7 +420,7 @@
     // TODO: Remove once touch path is merged into ProximityInfoState
     // Note: Returned codepoint may be a digraph codepoint if the node is in a composite glyph.
     int getNodeCodePoint() const {
-        const int codePoint = mDicNodeProperties.getNodeCodePoint();
+        const int codePoint = mDicNodeProperties.getDicNodeCodePoint();
         const DigraphUtils::DigraphCodePointIndex digraphIndex =
                 mDicNodeState.mDicNodeStateScoring.getDigraphIndex();
         if (digraphIndex == DigraphUtils::NOT_A_DIGRAPH_INDEX) {
@@ -423,8 +433,8 @@
     // Utils for cost calculation //
     ////////////////////////////////
     AK_FORCE_INLINE bool isSameNodeCodePoint(const DicNode *const dicNode) const {
-        return mDicNodeProperties.getNodeCodePoint()
-                == dicNode->mDicNodeProperties.getNodeCodePoint();
+        return mDicNodeProperties.getDicNodeCodePoint()
+                == dicNode->mDicNodeProperties.getDicNodeCodePoint();
     }
 
     // TODO: remove
@@ -484,8 +494,8 @@
         mDicNodeState.mDicNodeStateScoring.advanceDigraphIndex();
     }
 
-    bool isExactMatch() const {
-        return mDicNodeState.mDicNodeStateScoring.isExactMatch();
+    ErrorTypeUtils::ErrorType getContainedErrorTypes() const {
+        return mDicNodeState.mDicNodeStateScoring.getContainedErrorTypes();
     }
 
     bool isBlacklistedOrNotAWord() const {
@@ -526,8 +536,8 @@
             return false;
         }
         // Promote exact matches to prevent them from being pruned.
-        const bool leftExactMatch = isExactMatch();
-        const bool rightExactMatch = right->isExactMatch();
+        const bool leftExactMatch = ErrorTypeUtils::isExactMatch(getContainedErrorTypes());
+        const bool rightExactMatch = ErrorTypeUtils::isExactMatch(right->getContainedErrorTypes());
         if (leftExactMatch != rightExactMatch) {
             return leftExactMatch;
         }
@@ -574,7 +584,8 @@
     // Caveat: Must not be called outside Weighting
     // This restriction is guaranteed by "friend"
     AK_FORCE_INLINE void addCost(const float spatialCost, const float languageCost,
-            const bool doNormalization, const int inputSize, const ErrorType errorType) {
+            const bool doNormalization, const int inputSize,
+            const ErrorTypeUtils::ErrorType errorType) {
         if (DEBUG_GEO_FULL) {
             LOGI_SHOW_ADD_COST_PROP;
         }
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp b/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp
index ec65114..5540b6d 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp
+++ b/native/jni/src/suggest/core/dicnode/dic_node_utils.cpp
@@ -22,7 +22,6 @@
 #include "suggest/core/dicnode/dic_node_vector.h"
 #include "suggest/core/dictionary/multi_bigram_map.h"
 #include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
-#include "utils/char_utils.h"
 
 namespace latinime {
 
@@ -32,19 +31,20 @@
 
 /* static */ void DicNodeUtils::initAsRoot(
         const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-        const int prevWordNodePos, DicNode *const newRootNode) {
-    newRootNode->initAsRoot(dictionaryStructurePolicy->getRootPosition(), prevWordNodePos);
+        const int prevWordPtNodePos, DicNode *const newRootDicNode) {
+    newRootDicNode->initAsRoot(dictionaryStructurePolicy->getRootPosition(), prevWordPtNodePos);
 }
 
 /*static */ void DicNodeUtils::initAsRootWithPreviousWord(
         const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-        DicNode *const prevWordLastNode, DicNode *const newRootNode) {
-    newRootNode->initAsRootWithPreviousWord(
-            prevWordLastNode, dictionaryStructurePolicy->getRootPosition());
+        const DicNode *const prevWordLastDicNode, DicNode *const newRootDicNode) {
+    newRootDicNode->initAsRootWithPreviousWord(
+            prevWordLastDicNode, dictionaryStructurePolicy->getRootPosition());
 }
 
-/* static */ void DicNodeUtils::initByCopy(DicNode *srcNode, DicNode *destNode) {
-    destNode->initByCopy(srcNode);
+/* static */ void DicNodeUtils::initByCopy(const DicNode *const srcDicNode,
+        DicNode *const destDicNode) {
+    destDicNode->initByCopy(srcDicNode);
 }
 
 ///////////////////////////////////
@@ -52,14 +52,14 @@
 ///////////////////////////////////
 /* static */ void DicNodeUtils::getAllChildDicNodes(DicNode *dicNode,
         const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-        DicNodeVector *childDicNodes) {
+        DicNodeVector *const childDicNodes) {
     if (dicNode->isTotalInputSizeExceedingLimit()) {
         return;
     }
     if (!dicNode->isLeavingNode()) {
         childDicNodes->pushPassingChild(dicNode);
     } else {
-        dictionaryStructurePolicy->createAndGetAllChildNodes(dicNode, childDicNodes);
+        dictionaryStructurePolicy->createAndGetAllChildDicNodes(dicNode, childDicNodes);
     }
 }
 
@@ -71,11 +71,11 @@
  */
 /* static */ float DicNodeUtils::getBigramNodeImprobability(
         const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-        const DicNode *const node, MultiBigramMap *multiBigramMap) {
-    if (node->hasMultipleWords() && !node->isValidMultipleWordSuggestion()) {
+        const DicNode *const dicNode, MultiBigramMap *const multiBigramMap) {
+    if (dicNode->hasMultipleWords() && !dicNode->isValidMultipleWordSuggestion()) {
         return static_cast<float>(MAX_VALUE_FOR_WEIGHTING);
     }
-    const int probability = getBigramNodeProbability(dictionaryStructurePolicy, node,
+    const int probability = getBigramNodeProbability(dictionaryStructurePolicy, dicNode,
             multiBigramMap);
     // TODO: This equation to calculate the improbability looks unreasonable.  Investigate this.
     const float cost = static_cast<float>(MAX_PROBABILITY - probability)
@@ -85,19 +85,19 @@
 
 /* static */ int DicNodeUtils::getBigramNodeProbability(
         const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-        const DicNode *const node, MultiBigramMap *multiBigramMap) {
-    const int unigramProbability = node->getProbability();
-    const int wordPos = node->getPos();
-    const int prevWordPos = node->getPrevWordPos();
-    if (NOT_A_DICT_POS == wordPos || NOT_A_DICT_POS == prevWordPos) {
+        const DicNode *const dicNode, MultiBigramMap *const multiBigramMap) {
+    const int unigramProbability = dicNode->getProbability();
+    const int ptNodePos = dicNode->getPtNodePos();
+    const int prevWordTerminalPtNodePos = dicNode->getPrevWordTerminalPtNodePos();
+    if (NOT_A_DICT_POS == ptNodePos || NOT_A_DICT_POS == prevWordTerminalPtNodePos) {
         // Note: Normally wordPos comes from the dictionary and should never equal
         // NOT_A_VALID_WORD_POS.
         return dictionaryStructurePolicy->getProbability(unigramProbability,
                 NOT_A_PROBABILITY);
     }
     if (multiBigramMap) {
-        return multiBigramMap->getBigramProbability(dictionaryStructurePolicy, prevWordPos,
-                wordPos, unigramProbability);
+        return multiBigramMap->getBigramProbability(dictionaryStructurePolicy,
+                prevWordTerminalPtNodePos, ptNodePos, unigramProbability);
     }
     return dictionaryStructurePolicy->getProbability(unigramProbability,
             NOT_A_PROBABILITY);
@@ -109,7 +109,7 @@
 
 // TODO: Move to char_utils?
 /* static */ int DicNodeUtils::appendTwoWords(const int *const src0, const int16_t length0,
-        const int *const src1, const int16_t length1, int *dest) {
+        const int *const src1, const int16_t length1, int *const dest) {
     int actualLength0 = 0;
     for (int i = 0; i < length0; ++i) {
         if (src0[i] == 0) {
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_utils.h b/native/jni/src/suggest/core/dicnode/dic_node_utils.h
index 3fb351a..3f1514a 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_utils.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_utils.h
@@ -31,20 +31,20 @@
 class DicNodeUtils {
  public:
     static int appendTwoWords(const int *src0, const int16_t length0, const int *src1,
-            const int16_t length1, int *dest);
+            const int16_t length1, int *const dest);
     static void initAsRoot(
             const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-            const int prevWordNodePos, DicNode *newRootNode);
+            const int prevWordPtNodePos, DicNode *const newRootDicNode);
     static void initAsRootWithPreviousWord(
             const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-            DicNode *prevWordLastNode, DicNode *newRootNode);
-    static void initByCopy(DicNode *srcNode, DicNode *destNode);
+            const DicNode *const prevWordLastDicNode, DicNode *const newRootDicNode);
+    static void initByCopy(const DicNode *const srcDicNode, DicNode *const destDicNode);
     static void getAllChildDicNodes(DicNode *dicNode,
             const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
             DicNodeVector *childDicNodes);
     static float getBigramNodeImprobability(
             const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-            const DicNode *const node, MultiBigramMap *const multiBigramMap);
+            const DicNode *const dicNode, MultiBigramMap *const multiBigramMap);
 
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(DicNodeUtils);
@@ -53,7 +53,7 @@
 
     static int getBigramNodeProbability(
             const DictionaryStructureWithBufferPolicy *const dictionaryStructurePolicy,
-            const DicNode *const node, MultiBigramMap *multiBigramMap);
+            const DicNode *const dicNode, MultiBigramMap *const multiBigramMap);
 };
 } // namespace latinime
 #endif // LATINIME_DIC_NODE_UTILS_H
diff --git a/native/jni/src/suggest/core/dicnode/dic_node_vector.h b/native/jni/src/suggest/core/dicnode/dic_node_vector.h
index 42addae..9364e77 100644
--- a/native/jni/src/suggest/core/dicnode/dic_node_vector.h
+++ b/native/jni/src/suggest/core/dicnode/dic_node_vector.h
@@ -62,14 +62,14 @@
         mDicNodes.back().initAsPassingChild(dicNode);
     }
 
-    void pushLeavingChild(const DicNode *const dicNode, const int pos, const int childrenPos,
-            const int probability, const bool isTerminal, const bool hasChildren,
-            const bool isBlacklistedOrNotAWord, const uint16_t mergedNodeCodePointCount,
-            const int *const mergedNodeCodePoints) {
+    void pushLeavingChild(const DicNode *const dicNode, const int ptNodePos,
+            const int childrenPtNodeArrayPos, const int probability, const bool isTerminal,
+            const bool hasChildren, const bool isBlacklistedOrNotAWord,
+            const uint16_t mergedNodeCodePointCount, const int *const mergedNodeCodePoints) {
         ASSERT(!mLock);
         mDicNodes.push_back(mEmptyNode);
-        mDicNodes.back().initAsChild(dicNode, pos, childrenPos, probability, isTerminal,
-                hasChildren, isBlacklistedOrNotAWord, mergedNodeCodePointCount,
+        mDicNodes.back().initAsChild(dicNode, ptNodePos, childrenPtNodeArrayPos, probability,
+                isTerminal, hasChildren, isBlacklistedOrNotAWord, mergedNodeCodePointCount,
                 mergedNodeCodePoints);
     }
 
diff --git a/native/jni/src/suggest/core/dicnode/internal/dic_node_properties.h b/native/jni/src/suggest/core/dicnode/internal/dic_node_properties.h
index 9e0f62c..c41a724 100644
--- a/native/jni/src/suggest/core/dicnode/internal/dic_node_properties.h
+++ b/native/jni/src/suggest/core/dicnode/internal/dic_node_properties.h
@@ -24,15 +24,14 @@
 namespace latinime {
 
 /**
- * Node for traversing the lexicon trie.
+ * PtNode information related to the DicNode from the lexicon trie.
  */
-// TODO: Introduce a dictionary node class which has attribute members required to understand the
-// dictionary structure.
 class DicNodeProperties {
  public:
     AK_FORCE_INLINE DicNodeProperties()
-            : mPos(0), mChildrenPos(0), mProbability(0), mNodeCodePoint(0), mIsTerminal(false),
-              mHasChildren(false), mIsBlacklistedOrNotAWord(false), mDepth(0), mLeavingDepth(0) {}
+            : mPtNodePos(0), mChildrenPtNodeArrayPos(0), mProbability(0), mDicNodeCodePoint(0),
+              mIsTerminal(false), mHasChildrenPtNodes(false), mIsBlacklistedOrNotAWord(false),
+              mDepth(0), mLeavingDepth(0) {}
 
     virtual ~DicNodeProperties() {}
 
@@ -40,57 +39,57 @@
     void init(const int pos, const int childrenPos, const int nodeCodePoint, const int probability,
             const bool isTerminal, const bool hasChildren, const bool isBlacklistedOrNotAWord,
             const uint16_t depth, const uint16_t leavingDepth) {
-        mPos = pos;
-        mChildrenPos = childrenPos;
-        mNodeCodePoint = nodeCodePoint;
+        mPtNodePos = pos;
+        mChildrenPtNodeArrayPos = childrenPos;
+        mDicNodeCodePoint = nodeCodePoint;
         mProbability = probability;
         mIsTerminal = isTerminal;
-        mHasChildren = hasChildren;
+        mHasChildrenPtNodes = hasChildren;
         mIsBlacklistedOrNotAWord = isBlacklistedOrNotAWord;
         mDepth = depth;
         mLeavingDepth = leavingDepth;
     }
 
     // Init for copy
-    void init(const DicNodeProperties *const nodeProp) {
-        mPos = nodeProp->mPos;
-        mChildrenPos = nodeProp->mChildrenPos;
-        mNodeCodePoint = nodeProp->mNodeCodePoint;
-        mProbability = nodeProp->mProbability;
-        mIsTerminal = nodeProp->mIsTerminal;
-        mHasChildren = nodeProp->mHasChildren;
-        mIsBlacklistedOrNotAWord = nodeProp->mIsBlacklistedOrNotAWord;
-        mDepth = nodeProp->mDepth;
-        mLeavingDepth = nodeProp->mLeavingDepth;
+    void init(const DicNodeProperties *const dicNodeProp) {
+        mPtNodePos = dicNodeProp->mPtNodePos;
+        mChildrenPtNodeArrayPos = dicNodeProp->mChildrenPtNodeArrayPos;
+        mDicNodeCodePoint = dicNodeProp->mDicNodeCodePoint;
+        mProbability = dicNodeProp->mProbability;
+        mIsTerminal = dicNodeProp->mIsTerminal;
+        mHasChildrenPtNodes = dicNodeProp->mHasChildrenPtNodes;
+        mIsBlacklistedOrNotAWord = dicNodeProp->mIsBlacklistedOrNotAWord;
+        mDepth = dicNodeProp->mDepth;
+        mLeavingDepth = dicNodeProp->mLeavingDepth;
     }
 
     // Init as passing child
-    void init(const DicNodeProperties *const nodeProp, const int codePoint) {
-        mPos = nodeProp->mPos;
-        mChildrenPos = nodeProp->mChildrenPos;
-        mNodeCodePoint = codePoint; // Overwrite the node char of a passing child
-        mProbability = nodeProp->mProbability;
-        mIsTerminal = nodeProp->mIsTerminal;
-        mHasChildren = nodeProp->mHasChildren;
-        mIsBlacklistedOrNotAWord = nodeProp->mIsBlacklistedOrNotAWord;
-        mDepth = nodeProp->mDepth + 1; // Increment the depth of a passing child
-        mLeavingDepth = nodeProp->mLeavingDepth;
+    void init(const DicNodeProperties *const dicNodeProp, const int codePoint) {
+        mPtNodePos = dicNodeProp->mPtNodePos;
+        mChildrenPtNodeArrayPos = dicNodeProp->mChildrenPtNodeArrayPos;
+        mDicNodeCodePoint = codePoint; // Overwrite the node char of a passing child
+        mProbability = dicNodeProp->mProbability;
+        mIsTerminal = dicNodeProp->mIsTerminal;
+        mHasChildrenPtNodes = dicNodeProp->mHasChildrenPtNodes;
+        mIsBlacklistedOrNotAWord = dicNodeProp->mIsBlacklistedOrNotAWord;
+        mDepth = dicNodeProp->mDepth + 1; // Increment the depth of a passing child
+        mLeavingDepth = dicNodeProp->mLeavingDepth;
     }
 
-    int getPos() const {
-        return mPos;
+    int getPtNodePos() const {
+        return mPtNodePos;
     }
 
-    int getChildrenPos() const {
-        return mChildrenPos;
+    int getChildrenPtNodeArrayPos() const {
+        return mChildrenPtNodeArrayPos;
     }
 
     int getProbability() const {
         return mProbability;
     }
 
-    int getNodeCodePoint() const {
-        return mNodeCodePoint;
+    int getDicNodeCodePoint() const {
+        return mDicNodeCodePoint;
     }
 
     uint16_t getDepth() const {
@@ -107,7 +106,7 @@
     }
 
     bool hasChildren() const {
-        return mHasChildren || mDepth != mLeavingDepth;
+        return mHasChildrenPtNodes || mDepth != mLeavingDepth;
     }
 
     bool isBlacklistedOrNotAWord() const {
@@ -118,12 +117,12 @@
     // Caution!!!
     // Use a default copy constructor and an assign operator because shallow copies are ok
     // for this class
-    int mPos;
-    int mChildrenPos;
+    int mPtNodePos;
+    int mChildrenPtNodeArrayPos;
     int mProbability;
-    int mNodeCodePoint;
+    int mDicNodeCodePoint;
     bool mIsTerminal;
-    bool mHasChildren;
+    bool mHasChildrenPtNodes;
     bool mIsBlacklistedOrNotAWord;
     uint16_t mDepth;
     uint16_t mLeavingDepth;
diff --git a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h
index b898620..dba5705 100644
--- a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h
+++ b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_prevword.h
@@ -30,7 +30,7 @@
  public:
     AK_FORCE_INLINE DicNodeStatePrevWord()
             : mPrevWordCount(0), mPrevWordLength(0), mPrevWordStart(0), mPrevWordProbability(0),
-              mPrevWordNodePos(NOT_A_DICT_POS), mSecondWordFirstInputIndex(NOT_AN_INDEX) {
+              mPrevWordPtNodePos(NOT_A_DICT_POS), mSecondWordFirstInputIndex(NOT_AN_INDEX) {
         memset(mPrevWord, 0, sizeof(mPrevWord));
     }
 
@@ -41,7 +41,7 @@
         mPrevWordCount = 0;
         mPrevWordStart = 0;
         mPrevWordProbability = -1;
-        mPrevWordNodePos = NOT_A_DICT_POS;
+        mPrevWordPtNodePos = NOT_A_DICT_POS;
         mSecondWordFirstInputIndex = NOT_AN_INDEX;
     }
 
@@ -50,7 +50,7 @@
         mPrevWordCount = 0;
         mPrevWordStart = 0;
         mPrevWordProbability = -1;
-        mPrevWordNodePos = prevWordNodePos;
+        mPrevWordPtNodePos = prevWordNodePos;
         mSecondWordFirstInputIndex = NOT_AN_INDEX;
     }
 
@@ -60,7 +60,7 @@
         mPrevWordCount = prevWord->mPrevWordCount;
         mPrevWordStart = prevWord->mPrevWordStart;
         mPrevWordProbability = prevWord->mPrevWordProbability;
-        mPrevWordNodePos = prevWord->mPrevWordNodePos;
+        mPrevWordPtNodePos = prevWord->mPrevWordPtNodePos;
         mSecondWordFirstInputIndex = prevWord->mSecondWordFirstInputIndex;
         memcpy(mPrevWord, prevWord->mPrevWord, prevWord->mPrevWordLength * sizeof(mPrevWord[0]));
     }
@@ -71,7 +71,7 @@
             const int prevWordSecondWordFirstInputIndex, const int lastInputIndex) {
         mPrevWordCount = min(prevWordCount, static_cast<int16_t>(MAX_RESULTS));
         mPrevWordProbability = prevWordProbability;
-        mPrevWordNodePos = prevWordNodePos;
+        mPrevWordPtNodePos = prevWordNodePos;
         int twoWordsLen =
                 DicNodeUtils::appendTwoWords(src0, length0, src1, length1, mPrevWord);
         if (twoWordsLen >= MAX_WORD_LENGTH) {
@@ -116,8 +116,8 @@
         return mPrevWordStart;
     }
 
-    int getPrevWordNodePos() const {
-        return mPrevWordNodePos;
+    int getPrevWordPtNodePos() const {
+        return mPrevWordPtNodePos;
     }
 
     int getPrevWordCodePointAt(const int id) const {
@@ -147,7 +147,7 @@
     int16_t mPrevWordLength;
     int16_t mPrevWordStart;
     int16_t mPrevWordProbability;
-    int mPrevWordNodePos;
+    int mPrevWordPtNodePos;
     int mSecondWordFirstInputIndex;
 };
 } // namespace latinime
diff --git a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h
index 3c85d0e..11c201e 100644
--- a/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h
+++ b/native/jni/src/suggest/core/dicnode/internal/dic_node_state_scoring.h
@@ -21,6 +21,7 @@
 
 #include "defines.h"
 #include "suggest/core/dictionary/digraph_utils.h"
+#include "suggest/core/dictionary/error_type_utils.h"
 
 namespace latinime {
 
@@ -31,7 +32,7 @@
               mDigraphIndex(DigraphUtils::NOT_A_DIGRAPH_INDEX),
               mEditCorrectionCount(0), mProximityCorrectionCount(0),
               mNormalizedCompoundDistance(0.0f), mSpatialDistance(0.0f), mLanguageDistance(0.0f),
-              mRawLength(0.0f), mExactMatch(true),
+              mRawLength(0.0f), mContainedErrorTypes(ErrorTypeUtils::NOT_AN_ERROR),
               mNormalizedCompoundDistanceAfterFirstWord(MAX_VALUE_FOR_WEIGHTING) {
     }
 
@@ -47,7 +48,7 @@
         mDoubleLetterLevel = NOT_A_DOUBLE_LETTER;
         mDigraphIndex = DigraphUtils::NOT_A_DIGRAPH_INDEX;
         mNormalizedCompoundDistanceAfterFirstWord = MAX_VALUE_FOR_WEIGHTING;
-        mExactMatch = true;
+        mContainedErrorTypes = ErrorTypeUtils::NOT_AN_ERROR;
     }
 
     AK_FORCE_INLINE void init(const DicNodeStateScoring *const scoring) {
@@ -59,34 +60,21 @@
         mRawLength = scoring->mRawLength;
         mDoubleLetterLevel = scoring->mDoubleLetterLevel;
         mDigraphIndex = scoring->mDigraphIndex;
-        mExactMatch = scoring->mExactMatch;
+        mContainedErrorTypes = scoring->mContainedErrorTypes;
         mNormalizedCompoundDistanceAfterFirstWord =
                 scoring->mNormalizedCompoundDistanceAfterFirstWord;
     }
 
     void addCost(const float spatialCost, const float languageCost, const bool doNormalization,
-            const int inputSize, const int totalInputIndex, const ErrorType errorType) {
+            const int inputSize, const int totalInputIndex,
+            const ErrorTypeUtils::ErrorType errorType) {
         addDistance(spatialCost, languageCost, doNormalization, inputSize, totalInputIndex);
-        switch (errorType) {
-            case ET_EDIT_CORRECTION:
-                ++mEditCorrectionCount;
-                mExactMatch = false;
-                break;
-            case ET_PROXIMITY_CORRECTION:
-                ++mProximityCorrectionCount;
-                mExactMatch = false;
-                break;
-            case ET_COMPLETION:
-                mExactMatch = false;
-                break;
-            case ET_NEW_WORD:
-                mExactMatch = false;
-                break;
-            case ET_INTENTIONAL_OMISSION:
-                mExactMatch = false;
-                break;
-            case ET_NOT_AN_ERROR:
-                break;
+        mContainedErrorTypes = mContainedErrorTypes | errorType;
+        if (ErrorTypeUtils::isEditCorrectionError(errorType)) {
+            ++mEditCorrectionCount;
+        }
+        if (ErrorTypeUtils::isProximityCorrectionError(errorType)) {
+            ++mProximityCorrectionCount;
         }
     }
 
@@ -181,8 +169,8 @@
         }
     }
 
-    bool isExactMatch() const {
-        return mExactMatch;
+    ErrorTypeUtils::ErrorType getContainedErrorTypes() const {
+        return mContainedErrorTypes;
     }
 
  private:
@@ -199,7 +187,8 @@
     float mSpatialDistance;
     float mLanguageDistance;
     float mRawLength;
-    bool mExactMatch;
+    // All accumulated error types so far
+    ErrorTypeUtils::ErrorType mContainedErrorTypes;
     float mNormalizedCompoundDistanceAfterFirstWord;
 
     AK_FORCE_INLINE void addDistance(float spatialDistance, float languageDistance,
diff --git a/native/jni/src/suggest/core/dictionary/bigram_dictionary.cpp b/native/jni/src/suggest/core/dictionary/bigram_dictionary.cpp
index 71f4ef6..2a62b55 100644
--- a/native/jni/src/suggest/core/dictionary/bigram_dictionary.cpp
+++ b/native/jni/src/suggest/core/dictionary/bigram_dictionary.cpp
@@ -144,7 +144,7 @@
 int BigramDictionary::getBigramListPositionForWord(const int *prevWord, const int prevWordLength,
         const bool forceLowerCaseSearch) const {
     if (0 >= prevWordLength) return NOT_A_DICT_POS;
-    int pos = mDictionaryStructurePolicy->getTerminalNodePositionOfWord(prevWord, prevWordLength,
+    int pos = mDictionaryStructurePolicy->getTerminalPtNodePositionOfWord(prevWord, prevWordLength,
             forceLowerCaseSearch);
     if (NOT_A_DICT_POS == pos) return NOT_A_DICT_POS;
     return mDictionaryStructurePolicy->getBigramsPositionOfPtNode(pos);
@@ -155,7 +155,7 @@
     int pos = getBigramListPositionForWord(word0, length0, false /* forceLowerCaseSearch */);
     // getBigramListPositionForWord returns 0 if this word isn't in the dictionary or has no bigrams
     if (NOT_A_DICT_POS == pos) return NOT_A_PROBABILITY;
-    int nextWordPos = mDictionaryStructurePolicy->getTerminalNodePositionOfWord(word1, length1,
+    int nextWordPos = mDictionaryStructurePolicy->getTerminalPtNodePositionOfWord(word1, length1,
             false /* forceLowerCaseSearch */);
     if (NOT_A_DICT_POS == nextWordPos) return NOT_A_PROBABILITY;
 
@@ -163,7 +163,8 @@
             mDictionaryStructurePolicy->getBigramsStructurePolicy(), pos);
     while (bigramsIt.hasNext()) {
         bigramsIt.next();
-        if (bigramsIt.getBigramPos() == nextWordPos) {
+        if (bigramsIt.getBigramPos() == nextWordPos
+                && bigramsIt.getProbability() != NOT_A_PROBABILITY) {
             return mDictionaryStructurePolicy->getProbability(
                     mDictionaryStructurePolicy->getUnigramProbabilityOfPtNode(nextWordPos),
                     bigramsIt.getProbability());
diff --git a/native/jni/src/suggest/core/dictionary/bloom_filter.h b/native/jni/src/suggest/core/dictionary/bloom_filter.h
index 5205456..5f97004 100644
--- a/native/jni/src/suggest/core/dictionary/bloom_filter.h
+++ b/native/jni/src/suggest/core/dictionary/bloom_filter.h
@@ -50,6 +50,8 @@
     }
 
  private:
+    DISALLOW_ASSIGNMENT_OPERATOR(BloomFilter);
+
     // Size, in bytes, of the bloom filter index for bigrams
     // 128 gives us 1024 buckets. The probability of false positive is (1 - e ** (-kn/m))**k,
     // where k is the number of hash functions, n the number of bigrams, and m the number of
diff --git a/native/jni/src/suggest/core/dictionary/dictionary.cpp b/native/jni/src/suggest/core/dictionary/dictionary.cpp
index 59ead18..e68c0a6 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.cpp
+++ b/native/jni/src/suggest/core/dictionary/dictionary.cpp
@@ -21,46 +21,39 @@
 #include <stdint.h>
 
 #include "defines.h"
-#include "suggest/core/dictionary/bigram_dictionary.h"
 #include "suggest/core/policy/dictionary_header_structure_policy.h"
-#include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
 #include "suggest/core/session/dic_traverse_session.h"
 #include "suggest/core/suggest.h"
 #include "suggest/core/suggest_options.h"
 #include "suggest/policyimpl/gesture/gesture_suggest_policy_factory.h"
 #include "suggest/policyimpl/typing/typing_suggest_policy_factory.h"
 #include "utils/log_utils.h"
+#include "utils/time_keeper.h"
 
 namespace latinime {
 
 const int Dictionary::HEADER_ATTRIBUTE_BUFFER_SIZE = 32;
 
-Dictionary::Dictionary(JNIEnv *env,
-        DictionaryStructureWithBufferPolicy *const dictionaryStructureWithBufferPolicy)
+Dictionary::Dictionary(JNIEnv *env, const DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+        &dictionaryStructureWithBufferPolicy)
         : mDictionaryStructureWithBufferPolicy(dictionaryStructureWithBufferPolicy),
-          mBigramDictionary(new BigramDictionary(mDictionaryStructureWithBufferPolicy)),
+          mBigramDictionary(new BigramDictionary(mDictionaryStructureWithBufferPolicy.get())),
           mGestureSuggest(new Suggest(GestureSuggestPolicyFactory::getGestureSuggestPolicy())),
           mTypingSuggest(new Suggest(TypingSuggestPolicyFactory::getTypingSuggestPolicy())) {
     logDictionaryInfo(env);
 }
 
-Dictionary::~Dictionary() {
-    delete mBigramDictionary;
-    delete mGestureSuggest;
-    delete mTypingSuggest;
-    delete mDictionaryStructureWithBufferPolicy;
-}
-
 int Dictionary::getSuggestions(ProximityInfo *proximityInfo, DicTraverseSession *traverseSession,
         int *xcoordinates, int *ycoordinates, int *times, int *pointerIds, int *inputCodePoints,
         int inputSize, int *prevWordCodePoints, int prevWordLength, int commitPoint,
         const SuggestOptions *const suggestOptions, int *outWords, int *frequencies,
         int *spaceIndices, int *outputTypes, int *outputAutoCommitFirstWordConfidence) const {
+    TimeKeeper::setCurrentTime();
     int result = 0;
     if (suggestOptions->isGesture()) {
         DicTraverseSession::initSessionInstance(
                 traverseSession, this, prevWordCodePoints, prevWordLength, suggestOptions);
-        result = mGestureSuggest->getSuggestions(proximityInfo, traverseSession, xcoordinates,
+        result = mGestureSuggest.get()->getSuggestions(proximityInfo, traverseSession, xcoordinates,
                 ycoordinates, times, pointerIds, inputCodePoints, inputSize, commitPoint, outWords,
                 frequencies, spaceIndices, outputTypes, outputAutoCommitFirstWordConfidence);
         if (DEBUG_DICT) {
@@ -70,7 +63,7 @@
     } else {
         DicTraverseSession::initSessionInstance(
                 traverseSession, this, prevWordCodePoints, prevWordLength, suggestOptions);
-        result = mTypingSuggest->getSuggestions(proximityInfo, traverseSession, xcoordinates,
+        result = mTypingSuggest.get()->getSuggestions(proximityInfo, traverseSession, xcoordinates,
                 ycoordinates, times, pointerIds, inputCodePoints, inputSize, commitPoint,
                 outWords, frequencies, spaceIndices, outputTypes,
                 outputAutoCommitFirstWordConfidence);
@@ -83,12 +76,15 @@
 
 int Dictionary::getBigrams(const int *word, int length, int *outWords, int *frequencies,
         int *outputTypes) const {
+    TimeKeeper::setCurrentTime();
     if (length <= 0) return 0;
-    return mBigramDictionary->getPredictions(word, length, outWords, frequencies, outputTypes);
+    return mBigramDictionary.get()->getPredictions(word, length, outWords, frequencies,
+            outputTypes);
 }
 
 int Dictionary::getProbability(const int *word, int length) const {
-    int pos = getDictionaryStructurePolicy()->getTerminalNodePositionOfWord(word, length,
+    TimeKeeper::setCurrentTime();
+    int pos = getDictionaryStructurePolicy()->getTerminalPtNodePositionOfWord(word, length,
             false /* forceLowerCaseSearch */);
     if (NOT_A_DICT_POS == pos) {
         return NOT_A_PROBABILITY;
@@ -98,39 +94,60 @@
 
 int Dictionary::getBigramProbability(const int *word0, int length0, const int *word1,
         int length1) const {
-    return mBigramDictionary->getBigramProbability(word0, length0, word1, length1);
+    TimeKeeper::setCurrentTime();
+    return mBigramDictionary.get()->getBigramProbability(word0, length0, word1, length1);
 }
 
-void Dictionary::addUnigramWord(const int *const word, const int length, const int probability) {
-    mDictionaryStructureWithBufferPolicy->addUnigramWord(word, length, probability);
+void Dictionary::addUnigramWord(const int *const word, const int length, const int probability,
+        const int *const shortcutTargetCodePoints, const int shortcutLength,
+        const int shortcutProbability, const bool isNotAWord, const bool isBlacklisted,
+        const int timestamp) {
+    TimeKeeper::setCurrentTime();
+    mDictionaryStructureWithBufferPolicy.get()->addUnigramWord(word, length, probability,
+            shortcutTargetCodePoints, shortcutLength, shortcutProbability, isNotAWord,
+            isBlacklisted, timestamp);
 }
 
 void Dictionary::addBigramWords(const int *const word0, const int length0, const int *const word1,
-        const int length1, const int probability) {
-    mDictionaryStructureWithBufferPolicy->addBigramWords(word0, length0, word1, length1,
-            probability);
+        const int length1, const int probability, const int timestamp) {
+    TimeKeeper::setCurrentTime();
+    mDictionaryStructureWithBufferPolicy.get()->addBigramWords(word0, length0, word1, length1,
+            probability, timestamp);
 }
 
 void Dictionary::removeBigramWords(const int *const word0, const int length0,
         const int *const word1, const int length1) {
-    mDictionaryStructureWithBufferPolicy->removeBigramWords(word0, length0, word1, length1);
+    TimeKeeper::setCurrentTime();
+    mDictionaryStructureWithBufferPolicy.get()->removeBigramWords(word0, length0, word1, length1);
 }
 
 void Dictionary::flush(const char *const filePath) {
-    mDictionaryStructureWithBufferPolicy->flush(filePath);
+    TimeKeeper::setCurrentTime();
+    mDictionaryStructureWithBufferPolicy.get()->flush(filePath);
 }
 
 void Dictionary::flushWithGC(const char *const filePath) {
-    mDictionaryStructureWithBufferPolicy->flushWithGC(filePath);
+    TimeKeeper::setCurrentTime();
+    mDictionaryStructureWithBufferPolicy.get()->flushWithGC(filePath);
 }
 
 bool Dictionary::needsToRunGC(const bool mindsBlockByGC) {
-    return mDictionaryStructureWithBufferPolicy->needsToRunGC(mindsBlockByGC);
+    TimeKeeper::setCurrentTime();
+    return mDictionaryStructureWithBufferPolicy.get()->needsToRunGC(mindsBlockByGC);
 }
 
-void Dictionary::getProperty(const char *const query, char *const outResult,
+void Dictionary::getProperty(const char *const query, const int queryLength, char *const outResult,
         const int maxResultLength) {
-    return mDictionaryStructureWithBufferPolicy->getProperty(query, outResult, maxResultLength);
+    TimeKeeper::setCurrentTime();
+    return mDictionaryStructureWithBufferPolicy.get()->getProperty(query, queryLength, outResult,
+            maxResultLength);
+}
+
+const UnigramProperty Dictionary::getUnigramProperty(const int *const codePoints,
+        const int codePointCount) {
+    TimeKeeper::setCurrentTime();
+    return mDictionaryStructureWithBufferPolicy.get()->getUnigramProperty(
+            codePoints, codePointCount);
 }
 
 void Dictionary::logDictionaryInfo(JNIEnv *const env) const {
diff --git a/native/jni/src/suggest/core/dictionary/dictionary.h b/native/jni/src/suggest/core/dictionary/dictionary.h
index 0195d5b..b37b4aa 100644
--- a/native/jni/src/suggest/core/dictionary/dictionary.h
+++ b/native/jni/src/suggest/core/dictionary/dictionary.h
@@ -21,15 +21,20 @@
 
 #include "defines.h"
 #include "jni.h"
+#include "suggest/core/dictionary/bigram_dictionary.h"
+#include "suggest/core/dictionary/unigram_property.h"
+#include "suggest/core/policy/dictionary_header_structure_policy.h"
+#include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
+#include "suggest/core/suggest_interface.h"
+#include "utils/exclusive_ownership_pointer.h"
 
 namespace latinime {
 
-class BigramDictionary;
 class DictionaryStructureWithBufferPolicy;
 class DicTraverseSession;
 class ProximityInfo;
-class SuggestInterface;
 class SuggestOptions;
+class UnigramProperty;
 
 class Dictionary {
  public:
@@ -53,8 +58,8 @@
     static const int KIND_FLAG_POSSIBLY_OFFENSIVE = 0x80000000;
     static const int KIND_FLAG_EXACT_MATCH = 0x40000000;
 
-    Dictionary(JNIEnv *env,
-            DictionaryStructureWithBufferPolicy *const dictionaryStructureWithBufferPoilcy);
+    Dictionary(JNIEnv *env, const DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+            &dictionaryStructureWithBufferPolicy);
 
     int getSuggestions(ProximityInfo *proximityInfo, DicTraverseSession *traverseSession,
             int *xcoordinates, int *ycoordinates, int *times, int *pointerIds, int *inputCodePoints,
@@ -69,10 +74,13 @@
 
     int getBigramProbability(const int *word0, int length0, const int *word1, int length1) const;
 
-    void addUnigramWord(const int *const word, const int length, const int probability);
+    void addUnigramWord(const int *const word, const int length, const int probability,
+            const int *const shortcutTargetCodePoints, const int shortcutLength,
+            const int shortcutProbability, const bool isNotAWord, const bool isBlacklisted,
+            const int timestamp);
 
     void addBigramWords(const int *const word0, const int length0, const int *const word1,
-            const int length1, const int probability);
+            const int length1, const int probability, const int timestamp);
 
     void removeBigramWords(const int *const word0, const int length0, const int *const word1,
             const int length1);
@@ -83,24 +91,33 @@
 
     bool needsToRunGC(const bool mindsBlockByGC);
 
-    void getProperty(const char *const query, char *const outResult,
+    void getProperty(const char *const query, const int queryLength, char *const outResult,
             const int maxResultLength);
 
+    const UnigramProperty getUnigramProperty(const int *const codePoints, const int codePointCount);
+
     const DictionaryStructureWithBufferPolicy *getDictionaryStructurePolicy() const {
-        return mDictionaryStructureWithBufferPolicy;
+        return mDictionaryStructureWithBufferPolicy.get();
     }
 
-    virtual ~Dictionary();
+    int getFormatVersionNumber() const {
+        return mDictionaryStructureWithBufferPolicy.get()->getHeaderStructurePolicy()
+                ->getFormatVersionNumber();
+    }
 
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(Dictionary);
 
+    typedef ExclusiveOwnershipPointer<BigramDictionary> BigramDictionaryPtr;
+    typedef ExclusiveOwnershipPointer<SuggestInterface> SuggestInterfacePtr;
+
     static const int HEADER_ATTRIBUTE_BUFFER_SIZE;
 
-    DictionaryStructureWithBufferPolicy *const mDictionaryStructureWithBufferPolicy;
-    const BigramDictionary *const mBigramDictionary;
-    const SuggestInterface *const mGestureSuggest;
-    const SuggestInterface *const mTypingSuggest;
+    const DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+            mDictionaryStructureWithBufferPolicy;
+    const BigramDictionaryPtr mBigramDictionary;
+    const SuggestInterfacePtr mGestureSuggest;
+    const SuggestInterfacePtr mTypingSuggest;
 
     void logDictionaryInfo(JNIEnv *const env) const;
 };
diff --git a/native/jni/src/suggest/core/dictionary/digraph_utils.cpp b/native/jni/src/suggest/core/dictionary/digraph_utils.cpp
index 3271c1b..5f9b8f3 100644
--- a/native/jni/src/suggest/core/dictionary/digraph_utils.cpp
+++ b/native/jni/src/suggest/core/dictionary/digraph_utils.cpp
@@ -28,11 +28,8 @@
         { { 'a', 'e', 0x00E4 }, // U+00E4 : LATIN SMALL LETTER A WITH DIAERESIS
         { 'o', 'e', 0x00F6 },   // U+00F6 : LATIN SMALL LETTER O WITH DIAERESIS
         { 'u', 'e', 0x00FC } }; // U+00FC : LATIN SMALL LETTER U WITH DIAERESIS
-const DigraphUtils::digraph_t DigraphUtils::FRENCH_LIGATURES_DIGRAPHS[] =
-        { { 'a', 'e', 0x00E6 }, // U+00E6 : LATIN SMALL LETTER AE
-        { 'o', 'e', 0x0153 } }; // U+0153 : LATIN SMALL LIGATURE OE
 const DigraphUtils::DigraphType DigraphUtils::USED_DIGRAPH_TYPES[] =
-        { DIGRAPH_TYPE_GERMAN_UMLAUT, DIGRAPH_TYPE_FRENCH_LIGATURES };
+        { DIGRAPH_TYPE_GERMAN_UMLAUT };
 
 /* static */ bool DigraphUtils::hasDigraphForCodePoint(
         const DictionaryHeaderStructurePolicy *const headerPolicy,
@@ -50,9 +47,6 @@
     if (headerPolicy->requiresGermanUmlautProcessing()) {
         return DIGRAPH_TYPE_GERMAN_UMLAUT;
     }
-    if (headerPolicy->requiresFrenchLigatureProcessing()) {
-        return DIGRAPH_TYPE_FRENCH_LIGATURES;
-    }
     return DIGRAPH_TYPE_NONE;
 }
 
@@ -86,10 +80,6 @@
         *digraphs = GERMAN_UMLAUT_DIGRAPHS;
         return NELEMS(GERMAN_UMLAUT_DIGRAPHS);
     }
-    if (digraphType == DIGRAPH_TYPE_FRENCH_LIGATURES) {
-        *digraphs = FRENCH_LIGATURES_DIGRAPHS;
-        return NELEMS(FRENCH_LIGATURES_DIGRAPHS);
-    }
     return 0;
 }
 
diff --git a/native/jni/src/suggest/core/dictionary/digraph_utils.h b/native/jni/src/suggest/core/dictionary/digraph_utils.h
index 6ae16e3..bec2cd6 100644
--- a/native/jni/src/suggest/core/dictionary/digraph_utils.h
+++ b/native/jni/src/suggest/core/dictionary/digraph_utils.h
@@ -34,7 +34,6 @@
     typedef enum {
         DIGRAPH_TYPE_NONE,
         DIGRAPH_TYPE_GERMAN_UMLAUT,
-        DIGRAPH_TYPE_FRENCH_LIGATURES
     } DigraphType;
 
     typedef struct { int first; int second; int compositeGlyph; } digraph_t;
@@ -55,7 +54,6 @@
             const DigraphType digraphType, const int compositeGlyphCodePoint);
 
     static const digraph_t GERMAN_UMLAUT_DIGRAPHS[];
-    static const digraph_t FRENCH_LIGATURES_DIGRAPHS[];
     static const DigraphType USED_DIGRAPH_TYPES[];
 };
 } // namespace latinime
diff --git a/native/jni/src/suggest/core/dictionary/error_type_utils.cpp b/native/jni/src/suggest/core/dictionary/error_type_utils.cpp
new file mode 100644
index 0000000..0635fef
--- /dev/null
+++ b/native/jni/src/suggest/core/dictionary/error_type_utils.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/core/dictionary/error_type_utils.h"
+
+namespace latinime {
+
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::NOT_AN_ERROR = 0x0;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::MATCH_WITH_CASE_ERROR = 0x1;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::MATCH_WITH_ACCENT_ERROR = 0x2;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::MATCH_WITH_DIGRAPH = 0x4;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::INTENTIONAL_OMISSION = 0x8;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::EDIT_CORRECTION = 0x10;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::PROXIMITY_CORRECTION = 0x20;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::COMPLETION = 0x40;
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::NEW_WORD = 0x80;
+
+const ErrorTypeUtils::ErrorType ErrorTypeUtils::ERRORS_TREATED_AS_AN_EXACT_MATCH =
+        NOT_AN_ERROR | MATCH_WITH_CASE_ERROR | MATCH_WITH_ACCENT_ERROR | MATCH_WITH_DIGRAPH;
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/core/dictionary/error_type_utils.h b/native/jni/src/suggest/core/dictionary/error_type_utils.h
new file mode 100644
index 0000000..1122291
--- /dev/null
+++ b/native/jni/src/suggest/core/dictionary/error_type_utils.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_ERROR_TYPE_UTILS_H
+#define LATINIME_ERROR_TYPE_UTILS_H
+
+#include <stdint.h>
+
+#include "defines.h"
+
+namespace latinime {
+
+class ErrorTypeUtils {
+ public:
+    // ErrorType is mainly decided by CorrectionType but it is also depending on if
+    // the correction has really been performed or not.
+    typedef uint32_t ErrorType;
+
+    static const ErrorType NOT_AN_ERROR;
+    static const ErrorType MATCH_WITH_CASE_ERROR;
+    static const ErrorType MATCH_WITH_ACCENT_ERROR;
+    static const ErrorType MATCH_WITH_DIGRAPH;
+    // Treat error as an intentional omission when the CorrectionType is omission and the node can
+    // be intentional omission.
+    static const ErrorType INTENTIONAL_OMISSION;
+    // Substitution, omission and transposition
+    static const ErrorType EDIT_CORRECTION;
+    // Proximity error
+    static const ErrorType PROXIMITY_CORRECTION;
+    // Completion
+    static const ErrorType COMPLETION;
+    // New word
+    // TODO: Remove.
+    // A new word error should be an edit correction error or a proximity correction error.
+    static const ErrorType NEW_WORD;
+
+    static bool isExactMatch(const ErrorType containedErrorTypes) {
+        return (containedErrorTypes & ~ERRORS_TREATED_AS_AN_EXACT_MATCH) == 0;
+    }
+
+    static bool isEditCorrectionError(const ErrorType errorType) {
+        return (errorType & EDIT_CORRECTION) != 0;
+    }
+
+    static bool isProximityCorrectionError(const ErrorType errorType) {
+        return (errorType & PROXIMITY_CORRECTION) != 0;
+    }
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(ErrorTypeUtils);
+
+    static const ErrorType ERRORS_TREATED_AS_AN_EXACT_MATCH;
+};
+} // namespace latinime
+#endif // LATINIME_ERROR_TYPE_UTILS_H
diff --git a/native/jni/src/suggest/core/dictionary/multi_bigram_map.cpp b/native/jni/src/suggest/core/dictionary/multi_bigram_map.cpp
index b1d2f4b..49d82e6 100644
--- a/native/jni/src/suggest/core/dictionary/multi_bigram_map.cpp
+++ b/native/jni/src/suggest/core/dictionary/multi_bigram_map.cpp
@@ -30,4 +30,75 @@
 // Most common previous word contexts currently have 100 bigrams
 const int MultiBigramMap::BigramMap::DEFAULT_HASH_MAP_SIZE_FOR_EACH_BIGRAM_MAP = 100;
 
+// Look up the bigram probability for the given word pair from the cached bigram maps.
+// Also caches the bigrams if there is space remaining and they have not been cached already.
+int MultiBigramMap::getBigramProbability(
+        const DictionaryStructureWithBufferPolicy *const structurePolicy,
+        const int wordPosition, const int nextWordPosition, const int unigramProbability) {
+    hash_map_compat<int, BigramMap>::const_iterator mapPosition =
+            mBigramMaps.find(wordPosition);
+    if (mapPosition != mBigramMaps.end()) {
+        return mapPosition->second.getBigramProbability(structurePolicy, nextWordPosition,
+                unigramProbability);
+    }
+    if (mBigramMaps.size() < MAX_CACHED_PREV_WORDS_IN_BIGRAM_MAP) {
+        addBigramsForWordPosition(structurePolicy, wordPosition);
+        return mBigramMaps[wordPosition].getBigramProbability(structurePolicy,
+                nextWordPosition, unigramProbability);
+    }
+    return readBigramProbabilityFromBinaryDictionary(structurePolicy, wordPosition,
+            nextWordPosition, unigramProbability);
+}
+
+void MultiBigramMap::BigramMap::init(
+        const DictionaryStructureWithBufferPolicy *const structurePolicy, const int nodePos) {
+    const int bigramsListPos = structurePolicy->getBigramsPositionOfPtNode(nodePos);
+    BinaryDictionaryBigramsIterator bigramsIt(structurePolicy->getBigramsStructurePolicy(),
+            bigramsListPos);
+    while (bigramsIt.hasNext()) {
+        bigramsIt.next();
+        if (bigramsIt.getBigramPos() == NOT_A_DICT_POS) {
+            continue;
+        }
+        mBigramMap[bigramsIt.getBigramPos()] = bigramsIt.getProbability();
+        mBloomFilter.setInFilter(bigramsIt.getBigramPos());
+    }
+}
+
+int MultiBigramMap::BigramMap::getBigramProbability(
+        const DictionaryStructureWithBufferPolicy *const structurePolicy,
+        const int nextWordPosition, const int unigramProbability) const {
+    int bigramProbability = NOT_A_PROBABILITY;
+    if (mBloomFilter.isInFilter(nextWordPosition)) {
+        const hash_map_compat<int, int>::const_iterator bigramProbabilityIt =
+                mBigramMap.find(nextWordPosition);
+        if (bigramProbabilityIt != mBigramMap.end()) {
+            bigramProbability = bigramProbabilityIt->second;
+        }
+    }
+    return structurePolicy->getProbability(unigramProbability, bigramProbability);
+}
+
+void MultiBigramMap::addBigramsForWordPosition(
+        const DictionaryStructureWithBufferPolicy *const structurePolicy, const int position) {
+    mBigramMaps[position].init(structurePolicy, position);
+}
+
+int MultiBigramMap::readBigramProbabilityFromBinaryDictionary(
+        const DictionaryStructureWithBufferPolicy *const structurePolicy, const int nodePos,
+        const int nextWordPosition, const int unigramProbability) {
+    int bigramProbability = NOT_A_PROBABILITY;
+    const int bigramsListPos = structurePolicy->getBigramsPositionOfPtNode(nodePos);
+    BinaryDictionaryBigramsIterator bigramsIt(structurePolicy->getBigramsStructurePolicy(),
+            bigramsListPos);
+    while (bigramsIt.hasNext()) {
+        bigramsIt.next();
+        if (bigramsIt.getBigramPos() == nextWordPosition) {
+            bigramProbability = bigramsIt.getProbability();
+            break;
+        }
+    }
+    return structurePolicy->getProbability(unigramProbability, bigramProbability);
+}
+
 } // namespace latinime
diff --git a/native/jni/src/suggest/core/dictionary/multi_bigram_map.h b/native/jni/src/suggest/core/dictionary/multi_bigram_map.h
index 4633c07..421b268 100644
--- a/native/jni/src/suggest/core/dictionary/multi_bigram_map.h
+++ b/native/jni/src/suggest/core/dictionary/multi_bigram_map.h
@@ -38,21 +38,7 @@
     // Look up the bigram probability for the given word pair from the cached bigram maps.
     // Also caches the bigrams if there is space remaining and they have not been cached already.
     int getBigramProbability(const DictionaryStructureWithBufferPolicy *const structurePolicy,
-            const int wordPosition, const int nextWordPosition, const int unigramProbability) {
-        hash_map_compat<int, BigramMap>::const_iterator mapPosition =
-                mBigramMaps.find(wordPosition);
-        if (mapPosition != mBigramMaps.end()) {
-            return mapPosition->second.getBigramProbability(structurePolicy, nextWordPosition,
-                    unigramProbability);
-        }
-        if (mBigramMaps.size() < MAX_CACHED_PREV_WORDS_IN_BIGRAM_MAP) {
-            addBigramsForWordPosition(structurePolicy, wordPosition);
-            return mBigramMaps[wordPosition].getBigramProbability(structurePolicy,
-                    nextWordPosition, unigramProbability);
-        }
-        return readBigramProbabilityFromBinaryDictionary(structurePolicy, wordPosition,
-                nextWordPosition, unigramProbability);
-    }
+            const int wordPosition, const int nextWordPosition, const int unigramProbability);
 
     void clear() {
         mBigramMaps.clear();
@@ -67,33 +53,11 @@
         ~BigramMap() {}
 
         void init(const DictionaryStructureWithBufferPolicy *const structurePolicy,
-                const int nodePos) {
-            const int bigramsListPos = structurePolicy->getBigramsPositionOfPtNode(nodePos);
-            BinaryDictionaryBigramsIterator bigramsIt(structurePolicy->getBigramsStructurePolicy(),
-                    bigramsListPos);
-            while (bigramsIt.hasNext()) {
-                bigramsIt.next();
-                if (bigramsIt.getBigramPos() == NOT_A_DICT_POS) {
-                    continue;
-                }
-                mBigramMap[bigramsIt.getBigramPos()] = bigramsIt.getProbability();
-                mBloomFilter.setInFilter(bigramsIt.getBigramPos());
-            }
-        }
+                const int nodePos);
 
-        AK_FORCE_INLINE int getBigramProbability(
+        int getBigramProbability(
                 const DictionaryStructureWithBufferPolicy *const structurePolicy,
-                const int nextWordPosition, const int unigramProbability) const {
-            int bigramProbability = NOT_A_PROBABILITY;
-            if (mBloomFilter.isInFilter(nextWordPosition)) {
-                const hash_map_compat<int, int>::const_iterator bigramProbabilityIt =
-                        mBigramMap.find(nextWordPosition);
-                if (bigramProbabilityIt != mBigramMap.end()) {
-                    bigramProbability = bigramProbabilityIt->second;
-                }
-            }
-            return structurePolicy->getProbability(unigramProbability, bigramProbability);
-        }
+                const int nextWordPosition, const int unigramProbability) const;
 
      private:
         // NOTE: The BigramMap class doesn't use DISALLOW_COPY_AND_ASSIGN() because its default
@@ -103,27 +67,12 @@
         BloomFilter mBloomFilter;
     };
 
-    AK_FORCE_INLINE void addBigramsForWordPosition(
-            const DictionaryStructureWithBufferPolicy *const structurePolicy, const int position) {
-        mBigramMaps[position].init(structurePolicy, position);
-    }
+    void addBigramsForWordPosition(
+            const DictionaryStructureWithBufferPolicy *const structurePolicy, const int position);
 
-    AK_FORCE_INLINE int readBigramProbabilityFromBinaryDictionary(
+    int readBigramProbabilityFromBinaryDictionary(
             const DictionaryStructureWithBufferPolicy *const structurePolicy, const int nodePos,
-            const int nextWordPosition, const int unigramProbability) {
-        int bigramProbability = NOT_A_PROBABILITY;
-        const int bigramsListPos = structurePolicy->getBigramsPositionOfPtNode(nodePos);
-        BinaryDictionaryBigramsIterator bigramsIt(structurePolicy->getBigramsStructurePolicy(),
-                bigramsListPos);
-        while (bigramsIt.hasNext()) {
-            bigramsIt.next();
-            if (bigramsIt.getBigramPos() == nextWordPosition) {
-                bigramProbability = bigramsIt.getProbability();
-                break;
-            }
-        }
-        return structurePolicy->getProbability(unigramProbability, bigramProbability);
-    }
+            const int nextWordPosition, const int unigramProbability);
 
     static const size_t MAX_CACHED_PREV_WORDS_IN_BIGRAM_MAP;
     hash_map_compat<int, BigramMap> mBigramMaps;
diff --git a/native/jni/src/suggest/core/dictionary/shortcut_utils.h b/native/jni/src/suggest/core/dictionary/shortcut_utils.h
deleted file mode 100644
index 9ccef02..0000000
--- a/native/jni/src/suggest/core/dictionary/shortcut_utils.h
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_SHORTCUT_UTILS
-#define LATINIME_SHORTCUT_UTILS
-
-#include "defines.h"
-#include "suggest/core/dicnode/dic_node_utils.h"
-#include "suggest/core/dictionary/binary_dictionary_shortcut_iterator.h"
-
-namespace latinime {
-
-class ShortcutUtils {
- public:
-    static int outputShortcuts(BinaryDictionaryShortcutIterator *const shortcutIt,
-            int outputWordIndex, const int finalScore, int *const outputCodePoints,
-            int *const frequencies, int *const outputTypes, const bool sameAsTyped) {
-        int shortcutTarget[MAX_WORD_LENGTH];
-        while (shortcutIt->hasNextShortcutTarget() && outputWordIndex < MAX_RESULTS) {
-            bool isWhilelist;
-            int shortcutTargetStringLength;
-            shortcutIt->nextShortcutTarget(MAX_WORD_LENGTH, shortcutTarget,
-                    &shortcutTargetStringLength, &isWhilelist);
-            int shortcutScore;
-            int kind;
-            if (isWhilelist && sameAsTyped) {
-                shortcutScore = S_INT_MAX;
-                kind = Dictionary::KIND_WHITELIST;
-            } else {
-                // shortcut entry's score == its base entry's score - 1
-                shortcutScore = finalScore;
-                // Protection against int underflow
-                shortcutScore = max(S_INT_MIN + 1, shortcutScore) - 1;
-                kind = Dictionary::KIND_SHORTCUT;
-            }
-            outputTypes[outputWordIndex] = kind;
-            frequencies[outputWordIndex] = shortcutScore;
-            frequencies[outputWordIndex] = max(S_INT_MIN + 1, shortcutScore) - 1;
-            const int startIndex2 = outputWordIndex * MAX_WORD_LENGTH;
-            DicNodeUtils::appendTwoWords(0, 0, shortcutTarget, shortcutTargetStringLength,
-                    &outputCodePoints[startIndex2]);
-            ++outputWordIndex;
-        }
-        return outputWordIndex;
-    }
-
- private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(ShortcutUtils);
-};
-} // namespace latinime
-#endif // LATINIME_SHORTCUT_UTILS
diff --git a/native/jni/src/suggest/core/dictionary/suggestions_output_utils.cpp b/native/jni/src/suggest/core/dictionary/suggestions_output_utils.cpp
new file mode 100644
index 0000000..d219757
--- /dev/null
+++ b/native/jni/src/suggest/core/dictionary/suggestions_output_utils.cpp
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/core/dictionary/suggestions_output_utils.h"
+
+#include "suggest/core/dicnode/dic_node.h"
+#include "suggest/core/dicnode/dic_node_utils.h"
+#include "suggest/core/dictionary/binary_dictionary_shortcut_iterator.h"
+#include "suggest/core/dictionary/dictionary.h"
+#include "suggest/core/dictionary/error_type_utils.h"
+#include "suggest/core/policy/scoring.h"
+#include "suggest/core/session/dic_traverse_session.h"
+
+namespace latinime {
+
+const int SuggestionsOutputUtils::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
+
+// TODO: Split this method.
+/* static */ int SuggestionsOutputUtils::outputSuggestions(
+        const Scoring *const scoringPolicy, DicTraverseSession *traverseSession,
+        int *frequencies, int *outputCodePoints, int *outputIndicesToPartialCommit,
+        int *outputTypes, int *outputAutoCommitFirstWordConfidence) {
+#if DEBUG_EVALUATE_MOST_PROBABLE_STRING
+    const int terminalSize = 0;
+#else
+    const int terminalSize = min(MAX_RESULTS,
+            static_cast<int>(traverseSession->getDicTraverseCache()->terminalSize()));
+#endif
+    DicNode terminals[MAX_RESULTS]; // Avoiding non-POD variable length array
+
+    for (int index = terminalSize - 1; index >= 0; --index) {
+        traverseSession->getDicTraverseCache()->popTerminal(&terminals[index]);
+    }
+
+    const float languageWeight = scoringPolicy->getAdjustedLanguageWeight(
+            traverseSession, terminals, terminalSize);
+
+    int outputWordIndex = 0;
+    // Insert most probable word at index == 0 as long as there is one terminal at least
+    const bool hasMostProbableString =
+            scoringPolicy->getMostProbableString(traverseSession, terminalSize, languageWeight,
+                    &outputCodePoints[0], &outputTypes[0], &frequencies[0]);
+    if (hasMostProbableString) {
+        outputIndicesToPartialCommit[outputWordIndex] = NOT_AN_INDEX;
+        ++outputWordIndex;
+    }
+
+    // Initial value of the loop index for terminal nodes (words)
+    int doubleLetterTerminalIndex = -1;
+    DoubleLetterLevel doubleLetterLevel = NOT_A_DOUBLE_LETTER;
+    scoringPolicy->searchWordWithDoubleLetter(terminals, terminalSize,
+            &doubleLetterTerminalIndex, &doubleLetterLevel);
+
+    int maxScore = S_INT_MIN;
+    // Force autocorrection for obvious long multi-word suggestions when the top suggestion is
+    // a long multiple words suggestion.
+    // TODO: Implement a smarter auto-commit method for handling multi-word suggestions.
+    // traverseSession->isPartiallyCommited() always returns false because we never auto partial
+    // commit for now.
+    const bool forceCommitMultiWords = (terminalSize > 0) ?
+            scoringPolicy->autoCorrectsToMultiWordSuggestionIfTop()
+                    && (traverseSession->isPartiallyCommited()
+                            || (traverseSession->getInputSize()
+                                    >= MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT
+                                            && terminals[0].hasMultipleWords())) : false;
+    // TODO: have partial commit work even with multiple pointers.
+    const bool outputSecondWordFirstLetterInputIndex =
+            traverseSession->isOnlyOnePointerUsed(0 /* pointerId */);
+    if (terminalSize > 0) {
+        // If we have no suggestions, don't write this
+        outputAutoCommitFirstWordConfidence[0] =
+                computeFirstWordConfidence(&terminals[0]);
+    }
+
+    // Output suggestion results here
+    for (int terminalIndex = 0; terminalIndex < terminalSize && outputWordIndex < MAX_RESULTS;
+            ++terminalIndex) {
+        DicNode *terminalDicNode = &terminals[terminalIndex];
+        if (DEBUG_GEO_FULL) {
+            terminalDicNode->dump("OUT:");
+        }
+        const float doubleLetterCost = scoringPolicy->getDoubleLetterDemotionDistanceCost(
+                terminalIndex, doubleLetterTerminalIndex, doubleLetterLevel);
+        const float compoundDistance = terminalDicNode->getCompoundDistance(languageWeight)
+                + doubleLetterCost;
+        const bool isPossiblyOffensiveWord =
+                traverseSession->getDictionaryStructurePolicy()->getProbability(
+                        terminalDicNode->getProbability(), NOT_A_PROBABILITY) <= 0;
+        const bool isExactMatch =
+                ErrorTypeUtils::isExactMatch(terminalDicNode->getContainedErrorTypes());
+        const bool isFirstCharUppercase = terminalDicNode->isFirstCharUppercase();
+        // Heuristic: We exclude freq=0 first-char-uppercase words from exact match.
+        // (e.g. "AMD" and "and")
+        const bool isSafeExactMatch = isExactMatch
+                && !(isPossiblyOffensiveWord && isFirstCharUppercase);
+        const int outputTypeFlags =
+                (isPossiblyOffensiveWord ? Dictionary::KIND_FLAG_POSSIBLY_OFFENSIVE : 0)
+                | (isSafeExactMatch ? Dictionary::KIND_FLAG_EXACT_MATCH : 0);
+
+        // Entries that are blacklisted or do not represent a word should not be output.
+        const bool isValidWord = !terminalDicNode->isBlacklistedOrNotAWord();
+
+        // Increase output score of top typing suggestion to ensure autocorrection.
+        // TODO: Better integration with java side autocorrection logic.
+        const int finalScore = scoringPolicy->calculateFinalScore(
+                compoundDistance, traverseSession->getInputSize(),
+                terminalDicNode->getContainedErrorTypes(),
+                (forceCommitMultiWords && terminalDicNode->hasMultipleWords())
+                         || (isValidWord && scoringPolicy->doesAutoCorrectValidWord()));
+        if (maxScore < finalScore && isValidWord) {
+            maxScore = finalScore;
+        }
+
+        // Don't output invalid words. However, we still need to submit their shortcuts if any.
+        if (isValidWord) {
+            outputTypes[outputWordIndex] = Dictionary::KIND_CORRECTION | outputTypeFlags;
+            frequencies[outputWordIndex] = finalScore;
+            if (outputSecondWordFirstLetterInputIndex) {
+                outputIndicesToPartialCommit[outputWordIndex] =
+                        terminalDicNode->getSecondWordFirstInputIndex(
+                                traverseSession->getProximityInfoState(0));
+            } else {
+                outputIndicesToPartialCommit[outputWordIndex] = NOT_AN_INDEX;
+            }
+            // Populate the outputChars array with the suggested word.
+            const int startIndex = outputWordIndex * MAX_WORD_LENGTH;
+            terminalDicNode->outputResult(&outputCodePoints[startIndex]);
+            ++outputWordIndex;
+        }
+
+        if (!terminalDicNode->hasMultipleWords()) {
+            BinaryDictionaryShortcutIterator shortcutIt(
+                    traverseSession->getDictionaryStructurePolicy()->getShortcutsStructurePolicy(),
+                    traverseSession->getDictionaryStructurePolicy()
+                            ->getShortcutPositionOfPtNode(terminalDicNode->getPtNodePos()));
+            // Shortcut is not supported for multiple words suggestions.
+            // TODO: Check shortcuts during traversal for multiple words suggestions.
+            const bool sameAsTyped = scoringPolicy->sameAsTyped(traverseSession, terminalDicNode);
+            const int shortcutBaseScore = scoringPolicy->doesAutoCorrectValidWord() ?
+                     scoringPolicy->calculateFinalScore(compoundDistance,
+                             traverseSession->getInputSize(),
+                             terminalDicNode->getContainedErrorTypes(),
+                             true /* forceCommit */) : finalScore;
+            const int updatedOutputWordIndex = outputShortcuts(&shortcutIt,
+                    outputWordIndex, shortcutBaseScore, outputCodePoints, frequencies, outputTypes,
+                    sameAsTyped);
+            const int secondWordFirstInputIndex = terminalDicNode->getSecondWordFirstInputIndex(
+                    traverseSession->getProximityInfoState(0));
+            for (int i = outputWordIndex; i < updatedOutputWordIndex; ++i) {
+                if (outputSecondWordFirstLetterInputIndex) {
+                    outputIndicesToPartialCommit[i] = secondWordFirstInputIndex;
+                } else {
+                    outputIndicesToPartialCommit[i] = NOT_AN_INDEX;
+                }
+            }
+            outputWordIndex = updatedOutputWordIndex;
+        }
+        DicNode::managedDelete(terminalDicNode);
+    }
+
+    if (hasMostProbableString) {
+        scoringPolicy->safetyNetForMostProbableString(terminalSize, maxScore,
+                &outputCodePoints[0], &frequencies[0]);
+    }
+    return outputWordIndex;
+}
+
+/* static */ int SuggestionsOutputUtils::computeFirstWordConfidence(
+        const DicNode *const terminalDicNode) {
+    // Get the number of spaces in the first suggestion
+    const int spaceCount = terminalDicNode->getTotalNodeSpaceCount();
+    // Get the number of characters in the first suggestion
+    const int length = terminalDicNode->getTotalNodeCodePointCount();
+    // Get the distance for the first word of the suggestion
+    const float distance = terminalDicNode->getNormalizedCompoundDistanceAfterFirstWord();
+
+    // Arbitrarily, we give a score whose useful values range from 0 to 1,000,000.
+    // 1,000,000 will be the cutoff to auto-commit. It's fine if the number is under 0 or
+    // above 1,000,000 : under 0 just means it's very bad to commit, and above 1,000,000 means
+    // we are very confident.
+    // Expected space count is 1 ~ 5
+    static const int MIN_EXPECTED_SPACE_COUNT = 1;
+    static const int MAX_EXPECTED_SPACE_COUNT = 5;
+    // Expected length is about 4 ~ 30
+    static const int MIN_EXPECTED_LENGTH = 4;
+    static const int MAX_EXPECTED_LENGTH = 30;
+    // Expected distance is about 0.2 ~ 2.0, but consider 0.0 ~ 2.0
+    static const float MIN_EXPECTED_DISTANCE = 0.0;
+    static const float MAX_EXPECTED_DISTANCE = 2.0;
+    // This is not strict: it's where most stuff will be falling, but it's still fine if it's
+    // outside these values. We want to output a value that reflects all of these. Each factor
+    // contributes a bit.
+
+    // We need at least a space.
+    if (spaceCount < 1) return NOT_A_FIRST_WORD_CONFIDENCE;
+
+    // The smaller the edit distance, the higher the contribution. MIN_EXPECTED_DISTANCE means 0
+    // contribution, while MAX_EXPECTED_DISTANCE means full contribution according to the
+    // weight of the distance. Clamp to avoid overflows.
+    const float clampedDistance = distance < MIN_EXPECTED_DISTANCE ? MIN_EXPECTED_DISTANCE
+            : distance > MAX_EXPECTED_DISTANCE ? MAX_EXPECTED_DISTANCE : distance;
+    const int distanceContribution = DISTANCE_WEIGHT_FOR_AUTO_COMMIT
+            * (MAX_EXPECTED_DISTANCE - clampedDistance)
+            / (MAX_EXPECTED_DISTANCE - MIN_EXPECTED_DISTANCE);
+    // The larger the suggestion length, the larger the contribution. MIN_EXPECTED_LENGTH is no
+    // contribution, MAX_EXPECTED_LENGTH is full contribution according to the weight of the
+    // length. Length is guaranteed to be between 1 and 48, so we don't need to clamp.
+    const int lengthContribution = LENGTH_WEIGHT_FOR_AUTO_COMMIT
+            * (length - MIN_EXPECTED_LENGTH) / (MAX_EXPECTED_LENGTH - MIN_EXPECTED_LENGTH);
+    // The more spaces, the larger the contribution. MIN_EXPECTED_SPACE_COUNT space is no
+    // contribution, MAX_EXPECTED_SPACE_COUNT spaces is full contribution according to the
+    // weight of the space count.
+    const int spaceContribution = SPACE_COUNT_WEIGHT_FOR_AUTO_COMMIT
+            * (spaceCount - MIN_EXPECTED_SPACE_COUNT)
+            / (MAX_EXPECTED_SPACE_COUNT - MIN_EXPECTED_SPACE_COUNT);
+
+    return distanceContribution + lengthContribution + spaceContribution;
+}
+
+/* static */ int SuggestionsOutputUtils::outputShortcuts(
+        BinaryDictionaryShortcutIterator *const shortcutIt,
+        int outputWordIndex, const int finalScore, int *const outputCodePoints,
+        int *const frequencies, int *const outputTypes, const bool sameAsTyped) {
+    int shortcutTarget[MAX_WORD_LENGTH];
+    while (shortcutIt->hasNextShortcutTarget() && outputWordIndex < MAX_RESULTS) {
+        bool isWhilelist;
+        int shortcutTargetStringLength;
+        shortcutIt->nextShortcutTarget(MAX_WORD_LENGTH, shortcutTarget,
+                &shortcutTargetStringLength, &isWhilelist);
+        int shortcutScore;
+        int kind;
+        if (isWhilelist && sameAsTyped) {
+            shortcutScore = S_INT_MAX;
+            kind = Dictionary::KIND_WHITELIST;
+        } else {
+            // shortcut entry's score == its base entry's score - 1
+            shortcutScore = finalScore;
+            // Protection against int underflow
+            shortcutScore = max(S_INT_MIN + 1, shortcutScore) - 1;
+            kind = Dictionary::KIND_SHORTCUT;
+        }
+        outputTypes[outputWordIndex] = kind;
+        frequencies[outputWordIndex] = shortcutScore;
+        frequencies[outputWordIndex] = max(S_INT_MIN + 1, shortcutScore) - 1;
+        const int startIndex2 = outputWordIndex * MAX_WORD_LENGTH;
+        DicNodeUtils::appendTwoWords(0, 0, shortcutTarget, shortcutTargetStringLength,
+                &outputCodePoints[startIndex2]);
+        ++outputWordIndex;
+    }
+    return outputWordIndex;
+}
+} // namespace latinime
diff --git a/native/jni/src/suggest/core/dictionary/suggestions_output_utils.h b/native/jni/src/suggest/core/dictionary/suggestions_output_utils.h
new file mode 100644
index 0000000..460e260
--- /dev/null
+++ b/native/jni/src/suggest/core/dictionary/suggestions_output_utils.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_SUGGESTIONS_OUTPUT_UTILS
+#define LATINIME_SUGGESTIONS_OUTPUT_UTILS
+
+#include "defines.h"
+
+namespace latinime {
+
+class BinaryDictionaryShortcutIterator;
+class DicNode;
+class DicTraverseSession;
+class Scoring;
+
+class SuggestionsOutputUtils {
+ public:
+    /**
+     * Outputs the final list of suggestions (i.e., terminal nodes).
+     */
+    static int outputSuggestions(const Scoring *const scoringPolicy,
+            DicTraverseSession *traverseSession, int *frequencies, int *outputCodePoints,
+            int *outputIndicesToPartialCommit, int *outputTypes,
+            int *outputAutoCommitFirstWordConfidence);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(SuggestionsOutputUtils);
+
+    // Inputs longer than this will autocorrect if the suggestion is multi-word
+    static const int MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT;
+
+    static int computeFirstWordConfidence(const DicNode *const terminalDicNode);
+
+    static int outputShortcuts(BinaryDictionaryShortcutIterator *const shortcutIt,
+            int outputWordIndex, const int finalScore, int *const outputCodePoints,
+            int *const frequencies, int *const outputTypes, const bool sameAsTyped);
+};
+} // namespace latinime
+#endif // LATINIME_SUGGESTIONS_OUTPUT_UTILS
diff --git a/native/jni/src/suggest/core/dictionary/unigram_property.cpp b/native/jni/src/suggest/core/dictionary/unigram_property.cpp
new file mode 100644
index 0000000..16bbb69
--- /dev/null
+++ b/native/jni/src/suggest/core/dictionary/unigram_property.cpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/core/dictionary/unigram_property.h"
+
+namespace latinime {
+
+void UnigramProperty::outputProperties(JNIEnv *const env, jintArray outCodePoints,
+        jbooleanArray outFlags, jintArray outProbability, jintArray outHistoricalInfo,
+        jobject outShortcutTargets, jobject outShortcutProbabilities) const {
+    env->SetIntArrayRegion(outCodePoints, 0 /* start */, mCodePointCount, mCodePoints);
+    jboolean flags[] = {mIsNotAWord, mIsBlacklisted, mHasBigrams, mHasShortcuts};
+    env->SetBooleanArrayRegion(outFlags, 0 /* start */, NELEMS(flags), flags);
+    env->SetIntArrayRegion(outProbability, 0 /* start */, 1 /* len */, &mProbability);
+    int historicalInfo[] = {mTimestamp, mLevel, mCount};
+    env->SetIntArrayRegion(outHistoricalInfo, 0 /* start */, NELEMS(historicalInfo),
+            historicalInfo);
+
+    jclass integerClass = env->FindClass("java/lang/Integer");
+    jmethodID intToIntegerConstructorId = env->GetMethodID(integerClass, "<init>", "(I)V");
+    jclass arrayListClass = env->FindClass("java/util/ArrayList");
+    jmethodID addMethodId = env->GetMethodID(arrayListClass, "add", "(Ljava/lang/Object;)Z");
+    const int shortcutTargetCount = mShortcutTargets.size();
+    for (int i = 0; i < shortcutTargetCount; ++i) {
+        jintArray shortcutTargetCodePointArray = env->NewIntArray(mShortcutTargets[i].size());
+        env->SetIntArrayRegion(shortcutTargetCodePointArray, 0 /* start */,
+                mShortcutTargets[i].size(), &mShortcutTargets[i][0]);
+        env->CallVoidMethod(outShortcutTargets, addMethodId, shortcutTargetCodePointArray);
+        env->DeleteLocalRef(shortcutTargetCodePointArray);
+        jobject integerProbability = env->NewObject(integerClass, intToIntegerConstructorId,
+                mShortcutProbabilities[i]);
+        env->CallVoidMethod(outShortcutProbabilities, addMethodId, integerProbability);
+        env->DeleteLocalRef(integerProbability);
+    }
+    env->DeleteLocalRef(integerClass);
+    env->DeleteLocalRef(arrayListClass);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/core/dictionary/unigram_property.h b/native/jni/src/suggest/core/dictionary/unigram_property.h
new file mode 100644
index 0000000..c4ebb86
--- /dev/null
+++ b/native/jni/src/suggest/core/dictionary/unigram_property.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_UNIGRAM_PROPERTY_H
+#define LATINIME_UNIGRAM_PROPERTY_H
+
+#include <cstring>
+#include <vector>
+
+#include "defines.h"
+#include "jni.h"
+
+namespace latinime {
+
+// This class is used for returning information belonging to a unigram to java side.
+class UnigramProperty {
+ public:
+    // Invalid unigram.
+    UnigramProperty()
+            : mCodePoints(), mCodePointCount(0), mIsNotAWord(false), mIsBlacklisted(false),
+              mHasBigrams(false), mHasShortcuts(false), mProbability(NOT_A_PROBABILITY),
+              mTimestamp(0), mLevel(0), mCount(0), mShortcutTargets(), mShortcutProbabilities() {}
+
+    UnigramProperty(const UnigramProperty &unigramProperty)
+            : mCodePoints(), mCodePointCount(unigramProperty.mCodePointCount),
+              mIsNotAWord(unigramProperty.mIsNotAWord),
+              mIsBlacklisted(unigramProperty.mIsBlacklisted),
+              mHasBigrams(unigramProperty.mHasBigrams),
+              mHasShortcuts(unigramProperty.mHasShortcuts),
+              mProbability(unigramProperty.mProbability),
+              mTimestamp(unigramProperty.mTimestamp), mLevel(unigramProperty.mLevel),
+              mCount(unigramProperty.mCount), mShortcutTargets(unigramProperty.mShortcutTargets),
+              mShortcutProbabilities(unigramProperty.mShortcutProbabilities) {
+        memcpy(mCodePoints, unigramProperty.mCodePoints, sizeof(mCodePoints));
+    }
+
+    UnigramProperty(const int *const codePoints, const int codePointCount,
+            const bool isNotAWord, const bool isBlacklisted, const bool hasBigrams,
+            const bool hasShortcuts, const int probability, const int timestamp,
+            const int level, const int count,
+            const std::vector<std::vector<int> > *const shortcutTargets,
+            const std::vector<int> *const shortcutProbabilities)
+            : mCodePoints(), mCodePointCount(codePointCount),
+              mIsNotAWord(isNotAWord), mIsBlacklisted(isBlacklisted), mHasBigrams(hasBigrams),
+              mHasShortcuts(hasShortcuts), mProbability(probability), mTimestamp(timestamp),
+              mLevel(level), mCount(count), mShortcutTargets(*shortcutTargets),
+              mShortcutProbabilities(*shortcutProbabilities) {
+        memcpy(mCodePoints, codePoints, sizeof(mCodePoints));
+    }
+
+    void outputProperties(JNIEnv *const env, jintArray outCodePoints, jbooleanArray outFlags,
+            jintArray outProbability, jintArray outHistoricalInfo, jobject outShortcutTargets,
+            jobject outShortcutProbabilities) const;
+
+ private:
+    DISALLOW_ASSIGNMENT_OPERATOR(UnigramProperty);
+
+    int mCodePoints[MAX_WORD_LENGTH];
+    int mCodePointCount;
+    bool mIsNotAWord;
+    bool mIsBlacklisted;
+    bool mHasBigrams;
+    bool mHasShortcuts;
+    int mProbability;
+    // Historical information
+    int mTimestamp;
+    int mLevel;
+    int mCount;
+    // Shortcut
+    std::vector<std::vector<int> > mShortcutTargets;
+    std::vector<int> mShortcutProbabilities;
+};
+} // namespace latinime
+#endif // LATINIME_UNIGRAM_PROPERTY_H
diff --git a/native/jni/src/suggest/core/layout/proximity_info.cpp b/native/jni/src/suggest/core/layout/proximity_info.cpp
index e64476d..ee8e59e 100644
--- a/native/jni/src/suggest/core/layout/proximity_info.cpp
+++ b/native/jni/src/suggest/core/layout/proximity_info.cpp
@@ -71,7 +71,7 @@
                   && sweetSpotCenterYs && sweetSpotRadii),
           mProximityCharsArray(new int[GRID_WIDTH * GRID_HEIGHT * MAX_PROXIMITY_CHARS_SIZE
                   /* proximityCharsLength */]),
-          mCodeToKeyMap() {
+          mLowerCodePointToKeyMap() {
     /* Let's check the input array length here to make sure */
     const jsize proximityCharsLength = env->GetArrayLength(proximityChars);
     if (proximityCharsLength != GRID_WIDTH * GRID_HEIGHT * MAX_PROXIMITY_CHARS_SIZE) {
@@ -147,7 +147,14 @@
     if (keyIndex < 0 || keyIndex >= KEY_COUNT) {
         return NOT_A_CODE_POINT;
     }
-    return mKeyIndexToCodePointG[keyIndex];
+    return mKeyIndexToLowerCodePointG[keyIndex];
+}
+
+int ProximityInfo::getOriginalCodePointOf(const int keyIndex) const {
+    if (keyIndex < 0 || keyIndex >= KEY_COUNT) {
+        return NOT_A_CODE_POINT;
+    }
+    return mKeyIndexToOriginalCodePoint[keyIndex];
 }
 
 void ProximityInfo::initializeG() {
@@ -164,8 +171,9 @@
             const float gapY = sweetSpotCenterY - mCenterYsG[i];
             mSweetSpotCenterYsG[i] = static_cast<int>(mCenterYsG[i] + gapY * verticalScale);
         }
-        mCodeToKeyMap[lowerCode] = i;
-        mKeyIndexToCodePointG[i] = lowerCode;
+        mLowerCodePointToKeyMap[lowerCode] = i;
+        mKeyIndexToOriginalCodePoint[i] = code;
+        mKeyIndexToLowerCodePointG[i] = lowerCode;
     }
     for (int i = 0; i < KEY_COUNT; i++) {
         mKeyKeyDistancesG[i][i] = 0;
diff --git a/native/jni/src/suggest/core/layout/proximity_info.h b/native/jni/src/suggest/core/layout/proximity_info.h
index f259490..a91b9d6 100644
--- a/native/jni/src/suggest/core/layout/proximity_info.h
+++ b/native/jni/src/suggest/core/layout/proximity_info.h
@@ -39,6 +39,7 @@
     float getNormalizedSquaredDistanceFromCenterFloatG(
             const int keyId, const int x, const int y, const bool isGeometric) const;
     int getCodePointOf(const int keyIndex) const;
+    int getOriginalCodePointOf(const int keyIndex) const;
     bool hasSweetSpotData(const int keyIndex) const {
         // When there are no calibration data for a key,
         // the radius of the key is assigned to zero.
@@ -76,11 +77,11 @@
         ProximityInfoUtils::initializeProximities(inputCodes, inputXCoordinates, inputYCoordinates,
                 inputSize, mKeyXCoordinates, mKeyYCoordinates, mKeyWidths, mKeyHeights,
                 mProximityCharsArray, CELL_HEIGHT, CELL_WIDTH, GRID_WIDTH, MOST_COMMON_KEY_WIDTH,
-                KEY_COUNT, mLocaleStr, &mCodeToKeyMap, allInputCodes);
+                KEY_COUNT, mLocaleStr, &mLowerCodePointToKeyMap, allInputCodes);
     }
 
     AK_FORCE_INLINE int getKeyIndexOf(const int c) const {
-        return ProximityInfoUtils::getKeyIndexOf(KEY_COUNT, c, &mCodeToKeyMap);
+        return ProximityInfoUtils::getKeyIndexOf(KEY_COUNT, c, &mLowerCodePointToKeyMap);
     }
 
     AK_FORCE_INLINE bool isCodePointOnKeyboard(const int codePoint) const {
@@ -117,9 +118,9 @@
     // Sweet spots for geometric input. Note that we have extra sweet spots only for Y coordinates.
     float mSweetSpotCenterYsG[MAX_KEY_COUNT_IN_A_KEYBOARD];
     float mSweetSpotRadii[MAX_KEY_COUNT_IN_A_KEYBOARD];
-    hash_map_compat<int, int> mCodeToKeyMap;
-
-    int mKeyIndexToCodePointG[MAX_KEY_COUNT_IN_A_KEYBOARD];
+    hash_map_compat<int, int> mLowerCodePointToKeyMap;
+    int mKeyIndexToOriginalCodePoint[MAX_KEY_COUNT_IN_A_KEYBOARD];
+    int mKeyIndexToLowerCodePointG[MAX_KEY_COUNT_IN_A_KEYBOARD];
     int mCenterXsG[MAX_KEY_COUNT_IN_A_KEYBOARD];
     int mCenterYsG[MAX_KEY_COUNT_IN_A_KEYBOARD];
     int mKeyKeyDistancesG[MAX_KEY_COUNT_IN_A_KEYBOARD][MAX_KEY_COUNT_IN_A_KEYBOARD];
diff --git a/native/jni/src/suggest/core/layout/proximity_info_state.cpp b/native/jni/src/suggest/core/layout/proximity_info_state.cpp
index fbabd92..bb4b417 100644
--- a/native/jni/src/suggest/core/layout/proximity_info_state.cpp
+++ b/native/jni/src/suggest/core/layout/proximity_info_state.cpp
@@ -30,6 +30,12 @@
 
 namespace latinime {
 
+int ProximityInfoState::getPrimaryOriginalCodePointAt(const int index) const {
+    const int primaryCodePoint = getPrimaryCodePointAt(index);
+    const int keyIndex = mProximityInfo->getKeyIndexOf(primaryCodePoint);
+    return mProximityInfo->getOriginalCodePointOf(keyIndex);
+}
+
 // TODO: Remove the dependency of "isGeometric"
 void ProximityInfoState::initInputParams(const int pointerId, const float maxPointToKeyLength,
         const ProximityInfo *proximityInfo, const int *const inputCodes, const int inputSize,
diff --git a/native/jni/src/suggest/core/layout/proximity_info_state.h b/native/jni/src/suggest/core/layout/proximity_info_state.h
index c94060f..e941e43 100644
--- a/native/jni/src/suggest/core/layout/proximity_info_state.h
+++ b/native/jni/src/suggest/core/layout/proximity_info_state.h
@@ -65,6 +65,8 @@
         return getProximityCodePointsAt(index)[0];
     }
 
+    int getPrimaryOriginalCodePointAt(const int index) const;
+
     inline bool sameAsTyped(const int *word, int length) const {
         if (length != mSampledInputSize) {
             return false;
diff --git a/native/jni/src/suggest/core/policy/dictionary_header_structure_policy.h b/native/jni/src/suggest/core/policy/dictionary_header_structure_policy.h
index 5492c60..b76b139 100644
--- a/native/jni/src/suggest/core/policy/dictionary_header_structure_policy.h
+++ b/native/jni/src/suggest/core/policy/dictionary_header_structure_policy.h
@@ -29,12 +29,10 @@
  public:
     virtual ~DictionaryHeaderStructurePolicy() {}
 
-    virtual bool supportsDynamicUpdate() const = 0;
+    virtual int getFormatVersionNumber() const = 0;
 
     virtual bool requiresGermanUmlautProcessing() const = 0;
 
-    virtual bool requiresFrenchLigatureProcessing() const = 0;
-
     virtual float getMultiWordCostMultiplier() const = 0;
 
     virtual int getLastDecayedTime() const = 0;
diff --git a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
index 41f8204..c74a4eb 100644
--- a/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
+++ b/native/jni/src/suggest/core/policy/dictionary_structure_with_buffer_policy.h
@@ -18,6 +18,8 @@
 #define LATINIME_DICTIONARY_STRUCTURE_POLICY_H
 
 #include "defines.h"
+#include "suggest/core/dictionary/unigram_property.h"
+#include "utils/exclusive_ownership_pointer.h"
 
 namespace latinime {
 
@@ -28,23 +30,25 @@
 class DictionaryShortcutsStructurePolicy;
 
 /*
- * This class abstracts structure of dictionaries.
+ * This class abstracts the structure of dictionaries.
  * Implement this policy to support additional dictionaries.
  */
 class DictionaryStructureWithBufferPolicy {
  public:
+    typedef ExclusiveOwnershipPointer<DictionaryStructureWithBufferPolicy> StructurePolicyPtr;
+
     virtual ~DictionaryStructureWithBufferPolicy() {}
 
     virtual int getRootPosition() const = 0;
 
-    virtual void createAndGetAllChildNodes(const DicNode *const dicNode,
+    virtual void createAndGetAllChildDicNodes(const DicNode *const dicNode,
             DicNodeVector *const childDicNodes) const = 0;
 
     virtual int getCodePointsAndProbabilityAndReturnCodePointCount(
             const int nodePos, const int maxCodePointCount, int *const outCodePoints,
             int *const outUnigramProbability) const = 0;
 
-    virtual int getTerminalNodePositionOfWord(const int *const inWord,
+    virtual int getTerminalPtNodePositionOfWord(const int *const inWord,
             const int length, const bool forceLowerCaseSearch) const = 0;
 
     virtual int getProbability(const int unigramProbability,
@@ -64,11 +68,13 @@
 
     // Returns whether the update was success or not.
     virtual bool addUnigramWord(const int *const word, const int length,
-            const int probability) = 0;
+            const int probability, const int *const shortcutTargetCodePoints,
+            const int shortcutLength, const int shortcutProbability, const bool isNotAWord,
+            const bool isBlacklisted,const int timestamp) = 0;
 
     // Returns whether the update was success or not.
     virtual bool addBigramWords(const int *const word0, const int length0, const int *const word1,
-            const int length1, const int probability) = 0;
+            const int length1, const int probability, const int timestamp) = 0;
 
     // Returns whether the update was success or not.
     virtual bool removeBigramWords(const int *const word0, const int length0,
@@ -82,9 +88,13 @@
 
     // Currently, this method is used only for testing. You may want to consider creating new
     // dedicated method instead of this if you want to use this in the production.
-    virtual void getProperty(const char *const query, char *const outResult,
+    virtual void getProperty(const char *const query, const int queryLength, char *const outResult,
             const int maxResultLength) = 0;
 
+    // Used for testing.
+    virtual const UnigramProperty getUnigramProperty(const int *const codePonts,
+            const int codePointCount) const = 0;
+
  protected:
     DictionaryStructureWithBufferPolicy() {}
 
diff --git a/native/jni/src/suggest/core/policy/scoring.h b/native/jni/src/suggest/core/policy/scoring.h
index 102e856..5ae3d21 100644
--- a/native/jni/src/suggest/core/policy/scoring.h
+++ b/native/jni/src/suggest/core/policy/scoring.h
@@ -28,7 +28,7 @@
 class Scoring {
  public:
     virtual int calculateFinalScore(const float compoundDistance, const int inputSize,
-            const bool forceCommit) const = 0;
+            const ErrorTypeUtils::ErrorType containedErrorTypes, const bool forceCommit) const = 0;
     virtual bool getMostProbableString(const DicTraverseSession *const traverseSession,
             const int terminalSize, const float languageWeight, int *const outputCodePoints,
             int *const type, int *const freq) const = 0;
@@ -43,6 +43,9 @@
             const int doubleLetterTerminalIndex,
             const DoubleLetterLevel doubleLetterLevel) const = 0;
     virtual bool doesAutoCorrectValidWord() const = 0;
+    virtual bool autoCorrectsToMultiWordSuggestionIfTop() const = 0;
+    virtual bool sameAsTyped(const DicTraverseSession *const traverseSession,
+            const DicNode *const dicNode) const = 0;
 
  protected:
     Scoring() {}
diff --git a/native/jni/src/suggest/core/policy/traversal.h b/native/jni/src/suggest/core/policy/traversal.h
index e935533..d3b8da0 100644
--- a/native/jni/src/suggest/core/policy/traversal.h
+++ b/native/jni/src/suggest/core/policy/traversal.h
@@ -41,11 +41,8 @@
             const DicNode *const dicNode) const = 0;
     virtual ProximityType getProximityType(const DicTraverseSession *const traverseSession,
             const DicNode *const dicNode, const DicNode *const childDicNode) const = 0;
-    virtual bool sameAsTyped(const DicTraverseSession *const traverseSession,
-            const DicNode *const dicNode) const = 0;
     virtual bool needsToTraverseAllUserInput() const = 0;
     virtual float getMaxSpatialDistance() const = 0;
-    virtual bool autoCorrectsToMultiWordSuggestionIfTop() const = 0;
     virtual int getDefaultExpandDicNodeSize() const = 0;
     virtual int getMaxCacheSize(const int inputSize) const = 0;
     virtual bool isPossibleOmissionChildNode(const DicTraverseSession *const traverseSession,
diff --git a/native/jni/src/suggest/core/policy/weighting.cpp b/native/jni/src/suggest/core/policy/weighting.cpp
index 0c40168..c202b81 100644
--- a/native/jni/src/suggest/core/policy/weighting.cpp
+++ b/native/jni/src/suggest/core/policy/weighting.cpp
@@ -20,6 +20,7 @@
 #include "suggest/core/dicnode/dic_node.h"
 #include "suggest/core/dicnode/dic_node_profiler.h"
 #include "suggest/core/dicnode/dic_node_utils.h"
+#include "suggest/core/dictionary/error_type_utils.h"
 #include "suggest/core/session/dic_traverse_session.h"
 
 namespace latinime {
@@ -82,8 +83,8 @@
             traverseSession, parentDicNode, dicNode, &inputStateG);
     const float languageCost = Weighting::getLanguageCost(weighting, correctionType,
             traverseSession, parentDicNode, dicNode, multiBigramMap);
-    const ErrorType errorType = weighting->getErrorType(correctionType, traverseSession,
-            parentDicNode, dicNode);
+    const ErrorTypeUtils::ErrorType errorType = weighting->getErrorType(correctionType,
+            traverseSession, parentDicNode, dicNode);
     profile(correctionType, dicNode);
     if (inputStateG.mNeedsToUpdateInputStateG) {
         dicNode->updateInputIndexG(&inputStateG);
diff --git a/native/jni/src/suggest/core/policy/weighting.h b/native/jni/src/suggest/core/policy/weighting.h
index 2d49e98..bd6b3cf 100644
--- a/native/jni/src/suggest/core/policy/weighting.h
+++ b/native/jni/src/suggest/core/policy/weighting.h
@@ -18,6 +18,7 @@
 #define LATINIME_WEIGHTING_H
 
 #include "defines.h"
+#include "suggest/core/dictionary/error_type_utils.h"
 
 namespace latinime {
 
@@ -84,7 +85,7 @@
     virtual float getSpaceSubstitutionCost(const DicTraverseSession *const traverseSession,
             const DicNode *const dicNode) const = 0;
 
-    virtual ErrorType getErrorType(const CorrectionType correctionType,
+    virtual ErrorTypeUtils::ErrorType getErrorType(const CorrectionType correctionType,
             const DicTraverseSession *const traverseSession,
             const DicNode *const parentDicNode, const DicNode *const dicNode) const = 0;
 
diff --git a/native/jni/src/suggest/core/session/dic_traverse_session.cpp b/native/jni/src/suggest/core/session/dic_traverse_session.cpp
index 50f2bbd..5070491 100644
--- a/native/jni/src/suggest/core/session/dic_traverse_session.cpp
+++ b/native/jni/src/suggest/core/session/dic_traverse_session.cpp
@@ -35,16 +35,16 @@
             ->getMultiWordCostMultiplier();
     mSuggestOptions = suggestOptions;
     if (!prevWord) {
-        mPrevWordPos = NOT_A_DICT_POS;
+        mPrevWordPtNodePos = NOT_A_DICT_POS;
         return;
     }
     // TODO: merge following similar calls to getTerminalPosition into one case-insensitive call.
-    mPrevWordPos = getDictionaryStructurePolicy()->getTerminalNodePositionOfWord(
+    mPrevWordPtNodePos = getDictionaryStructurePolicy()->getTerminalPtNodePositionOfWord(
             prevWord, prevWordLength, false /* forceLowerCaseSearch */);
-    if (mPrevWordPos == NOT_A_DICT_POS) {
+    if (mPrevWordPtNodePos == NOT_A_DICT_POS) {
         // Check bigrams for lower-cased previous word if original was not found. Useful for
         // auto-capitalized words like "The [current_word]".
-        mPrevWordPos = getDictionaryStructurePolicy()->getTerminalNodePositionOfWord(
+        mPrevWordPtNodePos = getDictionaryStructurePolicy()->getTerminalPtNodePositionOfWord(
                 prevWord, prevWordLength, true /* forceLowerCaseSearch */);
     }
 }
diff --git a/native/jni/src/suggest/core/session/dic_traverse_session.h b/native/jni/src/suggest/core/session/dic_traverse_session.h
index e0b1c67..6e4dda4 100644
--- a/native/jni/src/suggest/core/session/dic_traverse_session.h
+++ b/native/jni/src/suggest/core/session/dic_traverse_session.h
@@ -59,7 +59,7 @@
     }
 
     AK_FORCE_INLINE DicTraverseSession(JNIEnv *env, jstring localeStr, bool usesLargeCache)
-            : mPrevWordPos(NOT_A_DICT_POS), mProximityInfo(0),
+            : mPrevWordPtNodePos(NOT_A_DICT_POS), mProximityInfo(0),
               mDictionary(0), mSuggestOptions(0), mDicNodesCache(usesLargeCache),
               mMultiBigramMap(), mInputSize(0), mPartiallyCommited(false), mMaxPointerCount(1),
               mMultiWordCostMultiplier(1.0f) {
@@ -86,11 +86,9 @@
     //--------------------
     const ProximityInfo *getProximityInfo() const { return mProximityInfo; }
     const SuggestOptions *getSuggestOptions() const { return mSuggestOptions; }
-    int getPrevWordPos() const { return mPrevWordPos; }
+    int getPrevWordPtNodePos() const { return mPrevWordPtNodePos; }
     // TODO: REMOVE
-    void setPrevWordPos(int pos) { mPrevWordPos = pos; }
-    // TODO: Use proper parameter when changed
-    int getDicRootPos() const { return 0; }
+    void setPrevWordPtNodePos(const int ptNodePos) { mPrevWordPtNodePos = ptNodePos; }
     DicNodesCache *getDicTraverseCache() { return &mDicNodesCache; }
     MultiBigramMap *getMultiBigramMap() { return &mMultiBigramMap; }
     const ProximityInfoState *getProximityInfoState(int id) const {
@@ -119,26 +117,13 @@
         return true;
     }
 
-    void getSearchKeys(const DicNode *node, std::vector<int> *const outputSearchKeyVector) const {
-        for (int i = 0; i < MAX_POINTER_COUNT_G; ++i) {
-            if (!mProximityInfoStates[i].isUsed()) {
-                continue;
-            }
-            const int pointerId = node->getInputIndex(i);
-            const std::vector<int> *const searchKeyVector =
-                    mProximityInfoStates[i].getSearchKeyVector(pointerId);
-            outputSearchKeyVector->insert(outputSearchKeyVector->end(), searchKeyVector->begin(),
-                    searchKeyVector->end());
-        }
-    }
-
-    ProximityType getProximityTypeG(const DicNode *const node, const int childCodePoint) const {
+    ProximityType getProximityTypeG(const DicNode *const dicNode, const int childCodePoint) const {
         ProximityType proximityType = UNRELATED_CHAR;
         for (int i = 0; i < MAX_POINTER_COUNT_G; ++i) {
             if (!mProximityInfoStates[i].isUsed()) {
                 continue;
             }
-            const int pointerId = node->getInputIndex(i);
+            const int pointerId = dicNode->getInputIndex(i);
             proximityType = mProximityInfoStates[i].getProximityTypeG(pointerId, childCodePoint);
             ASSERT(proximityType == UNRELATED_CHAR || proximityType == MATCH_CHAR);
             // TODO: Make this more generic
@@ -192,7 +177,7 @@
             const int *const inputYs, const int *const times, const int *const pointerIds,
             const int inputSize, const float maxSpatialDistance, const int maxPointerCount);
 
-    int mPrevWordPos;
+    int mPrevWordPtNodePos;
     const ProximityInfo *mProximityInfo;
     const Dictionary *mDictionary;
     const SuggestOptions *mSuggestOptions;
diff --git a/native/jni/src/suggest/core/suggest.cpp b/native/jni/src/suggest/core/suggest.cpp
index 73ccebc..7cd2372 100644
--- a/native/jni/src/suggest/core/suggest.cpp
+++ b/native/jni/src/suggest/core/suggest.cpp
@@ -19,13 +19,11 @@
 #include "suggest/core/dicnode/dic_node.h"
 #include "suggest/core/dicnode/dic_node_priority_queue.h"
 #include "suggest/core/dicnode/dic_node_vector.h"
-#include "suggest/core/dictionary/binary_dictionary_shortcut_iterator.h"
 #include "suggest/core/dictionary/dictionary.h"
 #include "suggest/core/dictionary/digraph_utils.h"
-#include "suggest/core/dictionary/shortcut_utils.h"
+#include "suggest/core/dictionary/suggestions_output_utils.h"
 #include "suggest/core/layout/proximity_info.h"
 #include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
-#include "suggest/core/policy/scoring.h"
 #include "suggest/core/policy/traversal.h"
 #include "suggest/core/policy/weighting.h"
 #include "suggest/core/session/dic_traverse_session.h"
@@ -33,9 +31,7 @@
 namespace latinime {
 
 // Initialization of class constants.
-const int Suggest::MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT = 16;
 const int Suggest::MIN_CONTINUOUS_SUGGESTION_INPUT_SIZE = 2;
-const float Suggest::AUTOCORRECT_CLASSIFICATION_THRESHOLD = 0.33f;
 
 /**
  * Returns a set of suggestions for the given input touch points. The commitPoint argument indicates
@@ -70,8 +66,8 @@
     }
     PROF_END(1);
     PROF_START(2);
-    const int size = outputSuggestions(tSession, frequencies, outWords, outputIndices, outputTypes,
-            outputAutoCommitFirstWordConfidence);
+    const int size = SuggestionsOutputUtils::outputSuggestions(SCORING, tSession, frequencies,
+            outWords, outputIndices, outputTypes, outputAutoCommitFirstWordConfidence);
     PROF_END(2);
     PROF_CLOSE;
     return size;
@@ -98,7 +94,7 @@
             // Continue suggestion after partial commit.
             DicNode *topDicNode =
                     traverseSession->getDicTraverseCache()->setCommitPoint(commitPoint);
-            traverseSession->setPrevWordPos(topDicNode->getPrevWordNodePos());
+            traverseSession->setPrevWordPtNodePos(topDicNode->getPrevWordPtNodePos());
             traverseSession->getDicTraverseCache()->continueSearch();
             traverseSession->setPartiallyCommited();
         }
@@ -109,208 +105,12 @@
         // Create a new dic node here
         DicNode rootNode;
         DicNodeUtils::initAsRoot(traverseSession->getDictionaryStructurePolicy(),
-                traverseSession->getPrevWordPos(), &rootNode);
+                traverseSession->getPrevWordPtNodePos(), &rootNode);
         traverseSession->getDicTraverseCache()->copyPushActive(&rootNode);
     }
 }
 
 /**
- * Outputs the final list of suggestions (i.e., terminal nodes).
- */
-int Suggest::outputSuggestions(DicTraverseSession *traverseSession, int *frequencies,
-        int *outputCodePoints, int *outputIndicesToPartialCommit, int *outputTypes,
-        int *outputAutoCommitFirstWordConfidence) const {
-#if DEBUG_EVALUATE_MOST_PROBABLE_STRING
-    const int terminalSize = 0;
-#else
-    const int terminalSize = min(MAX_RESULTS,
-            static_cast<int>(traverseSession->getDicTraverseCache()->terminalSize()));
-#endif
-    DicNode terminals[MAX_RESULTS]; // Avoiding non-POD variable length array
-
-    for (int index = terminalSize - 1; index >= 0; --index) {
-        traverseSession->getDicTraverseCache()->popTerminal(&terminals[index]);
-    }
-
-    const float languageWeight = SCORING->getAdjustedLanguageWeight(
-            traverseSession, terminals, terminalSize);
-
-    int outputWordIndex = 0;
-    // Insert most probable word at index == 0 as long as there is one terminal at least
-    const bool hasMostProbableString =
-            SCORING->getMostProbableString(traverseSession, terminalSize, languageWeight,
-                    &outputCodePoints[0], &outputTypes[0], &frequencies[0]);
-    if (hasMostProbableString) {
-        outputIndicesToPartialCommit[outputWordIndex] = NOT_AN_INDEX;
-        ++outputWordIndex;
-    }
-
-    // Initial value of the loop index for terminal nodes (words)
-    int doubleLetterTerminalIndex = -1;
-    DoubleLetterLevel doubleLetterLevel = NOT_A_DOUBLE_LETTER;
-    SCORING->searchWordWithDoubleLetter(terminals, terminalSize,
-            &doubleLetterTerminalIndex, &doubleLetterLevel);
-
-    int maxScore = S_INT_MIN;
-    // Force autocorrection for obvious long multi-word suggestions when the top suggestion is
-    // a long multiple words suggestion.
-    // TODO: Implement a smarter auto-commit method for handling multi-word suggestions.
-    // traverseSession->isPartiallyCommited() always returns false because we never auto partial
-    // commit for now.
-    const bool forceCommitMultiWords = (terminalSize > 0) ?
-            TRAVERSAL->autoCorrectsToMultiWordSuggestionIfTop()
-                    && (traverseSession->isPartiallyCommited()
-                            || (traverseSession->getInputSize()
-                                    >= MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT
-                                            && terminals[0].hasMultipleWords())) : false;
-    // TODO: have partial commit work even with multiple pointers.
-    const bool outputSecondWordFirstLetterInputIndex =
-            traverseSession->isOnlyOnePointerUsed(0 /* pointerId */);
-    if (terminalSize > 0) {
-        // If we have no suggestions, don't write this
-        outputAutoCommitFirstWordConfidence[0] =
-                computeFirstWordConfidence(&terminals[0]);
-    }
-
-    // Output suggestion results here
-    for (int terminalIndex = 0; terminalIndex < terminalSize && outputWordIndex < MAX_RESULTS;
-            ++terminalIndex) {
-        DicNode *terminalDicNode = &terminals[terminalIndex];
-        if (DEBUG_GEO_FULL) {
-            terminalDicNode->dump("OUT:");
-        }
-        const float doubleLetterCost = SCORING->getDoubleLetterDemotionDistanceCost(
-                terminalIndex, doubleLetterTerminalIndex, doubleLetterLevel);
-        const float compoundDistance = terminalDicNode->getCompoundDistance(languageWeight)
-                + doubleLetterCost;
-        const bool isPossiblyOffensiveWord =
-                traverseSession->getDictionaryStructurePolicy()->getProbability(
-                        terminalDicNode->getProbability(), NOT_A_PROBABILITY) <= 0;
-        const bool isExactMatch = terminalDicNode->isExactMatch();
-        const bool isFirstCharUppercase = terminalDicNode->isFirstCharUppercase();
-        // Heuristic: We exclude freq=0 first-char-uppercase words from exact match.
-        // (e.g. "AMD" and "and")
-        const bool isSafeExactMatch = isExactMatch
-                && !(isPossiblyOffensiveWord && isFirstCharUppercase);
-        const int outputTypeFlags =
-                (isPossiblyOffensiveWord ? Dictionary::KIND_FLAG_POSSIBLY_OFFENSIVE : 0)
-                | (isSafeExactMatch ? Dictionary::KIND_FLAG_EXACT_MATCH : 0);
-
-        // Entries that are blacklisted or do not represent a word should not be output.
-        const bool isValidWord = !terminalDicNode->isBlacklistedOrNotAWord();
-
-        // Increase output score of top typing suggestion to ensure autocorrection.
-        // TODO: Better integration with java side autocorrection logic.
-        const int finalScore = SCORING->calculateFinalScore(
-                compoundDistance, traverseSession->getInputSize(),
-                terminalDicNode->isExactMatch()
-                        || (forceCommitMultiWords && terminalDicNode->hasMultipleWords())
-                                || (isValidWord && SCORING->doesAutoCorrectValidWord()));
-        if (maxScore < finalScore && isValidWord) {
-            maxScore = finalScore;
-        }
-
-        // Don't output invalid words. However, we still need to submit their shortcuts if any.
-        if (isValidWord) {
-            outputTypes[outputWordIndex] = Dictionary::KIND_CORRECTION | outputTypeFlags;
-            frequencies[outputWordIndex] = finalScore;
-            if (outputSecondWordFirstLetterInputIndex) {
-                outputIndicesToPartialCommit[outputWordIndex] =
-                        terminalDicNode->getSecondWordFirstInputIndex(
-                                traverseSession->getProximityInfoState(0));
-            } else {
-                outputIndicesToPartialCommit[outputWordIndex] = NOT_AN_INDEX;
-            }
-            // Populate the outputChars array with the suggested word.
-            const int startIndex = outputWordIndex * MAX_WORD_LENGTH;
-            terminalDicNode->outputResult(&outputCodePoints[startIndex]);
-            ++outputWordIndex;
-        }
-
-        if (!terminalDicNode->hasMultipleWords()) {
-            BinaryDictionaryShortcutIterator shortcutIt(
-                    traverseSession->getDictionaryStructurePolicy()->getShortcutsStructurePolicy(),
-                    traverseSession->getDictionaryStructurePolicy()
-                            ->getShortcutPositionOfPtNode(terminalDicNode->getPos()));
-            // Shortcut is not supported for multiple words suggestions.
-            // TODO: Check shortcuts during traversal for multiple words suggestions.
-            const bool sameAsTyped = TRAVERSAL->sameAsTyped(traverseSession, terminalDicNode);
-            const int updatedOutputWordIndex = ShortcutUtils::outputShortcuts(&shortcutIt,
-                    outputWordIndex,  finalScore, outputCodePoints, frequencies, outputTypes,
-                    sameAsTyped);
-            const int secondWordFirstInputIndex = terminalDicNode->getSecondWordFirstInputIndex(
-                    traverseSession->getProximityInfoState(0));
-            for (int i = outputWordIndex; i < updatedOutputWordIndex; ++i) {
-                if (outputSecondWordFirstLetterInputIndex) {
-                    outputIndicesToPartialCommit[i] = secondWordFirstInputIndex;
-                } else {
-                    outputIndicesToPartialCommit[i] = NOT_AN_INDEX;
-                }
-            }
-            outputWordIndex = updatedOutputWordIndex;
-        }
-        DicNode::managedDelete(terminalDicNode);
-    }
-
-    if (hasMostProbableString) {
-        SCORING->safetyNetForMostProbableString(terminalSize, maxScore,
-                &outputCodePoints[0], &frequencies[0]);
-    }
-    return outputWordIndex;
-}
-
-int Suggest::computeFirstWordConfidence(const DicNode *const terminalDicNode) const {
-    // Get the number of spaces in the first suggestion
-    const int spaceCount = terminalDicNode->getTotalNodeSpaceCount();
-    // Get the number of characters in the first suggestion
-    const int length = terminalDicNode->getTotalNodeCodePointCount();
-    // Get the distance for the first word of the suggestion
-    const float distance = terminalDicNode->getNormalizedCompoundDistanceAfterFirstWord();
-
-    // Arbitrarily, we give a score whose useful values range from 0 to 1,000,000.
-    // 1,000,000 will be the cutoff to auto-commit. It's fine if the number is under 0 or
-    // above 1,000,000 : under 0 just means it's very bad to commit, and above 1,000,000 means
-    // we are very confident.
-    // Expected space count is 1 ~ 5
-    static const int MIN_EXPECTED_SPACE_COUNT = 1;
-    static const int MAX_EXPECTED_SPACE_COUNT = 5;
-    // Expected length is about 4 ~ 30
-    static const int MIN_EXPECTED_LENGTH = 4;
-    static const int MAX_EXPECTED_LENGTH = 30;
-    // Expected distance is about 0.2 ~ 2.0, but consider 0.0 ~ 2.0
-    static const float MIN_EXPECTED_DISTANCE = 0.0;
-    static const float MAX_EXPECTED_DISTANCE = 2.0;
-    // This is not strict: it's where most stuff will be falling, but it's still fine if it's
-    // outside these values. We want to output a value that reflects all of these. Each factor
-    // contributes a bit.
-
-    // We need at least a space.
-    if (spaceCount < 1) return NOT_A_FIRST_WORD_CONFIDENCE;
-
-    // The smaller the edit distance, the higher the contribution. MIN_EXPECTED_DISTANCE means 0
-    // contribution, while MAX_EXPECTED_DISTANCE means full contribution according to the
-    // weight of the distance. Clamp to avoid overflows.
-    const float clampedDistance = distance < MIN_EXPECTED_DISTANCE ? MIN_EXPECTED_DISTANCE
-            : distance > MAX_EXPECTED_DISTANCE ? MAX_EXPECTED_DISTANCE : distance;
-    const int distanceContribution = DISTANCE_WEIGHT_FOR_AUTO_COMMIT
-            * (MAX_EXPECTED_DISTANCE - clampedDistance)
-            / (MAX_EXPECTED_DISTANCE - MIN_EXPECTED_DISTANCE);
-    // The larger the suggestion length, the larger the contribution. MIN_EXPECTED_LENGTH is no
-    // contribution, MAX_EXPECTED_LENGTH is full contribution according to the weight of the
-    // length. Length is guaranteed to be between 1 and 48, so we don't need to clamp.
-    const int lengthContribution = LENGTH_WEIGHT_FOR_AUTO_COMMIT
-            * (length - MIN_EXPECTED_LENGTH) / (MAX_EXPECTED_LENGTH - MIN_EXPECTED_LENGTH);
-    // The more spaces, the larger the contribution. MIN_EXPECTED_SPACE_COUNT space is no
-    // contribution, MAX_EXPECTED_SPACE_COUNT spaces is full contribution according to the
-    // weight of the space count.
-    const int spaceContribution = SPACE_COUNT_WEIGHT_FOR_AUTO_COMMIT
-            * (spaceCount - MIN_EXPECTED_SPACE_COUNT)
-            / (MAX_EXPECTED_SPACE_COUNT - MIN_EXPECTED_SPACE_COUNT);
-
-    return distanceContribution + lengthContribution + spaceContribution;
-}
-
-/**
  * Expands the dicNodes in the current search priority queue by advancing to the possible child
  * nodes based on the next touch point(s) (or no touch points for lookahead)
  */
@@ -421,15 +221,15 @@
                         }
                         break;
                     case UNRELATED_CHAR:
-                        // Just drop this node and do nothing.
+                        // Just drop this dicNode and do nothing.
                         break;
                     default:
-                        // Just drop this node and do nothing.
+                        // Just drop this dicNode and do nothing.
                         break;
                 }
             }
 
-            // Push the node for look-ahead correction
+            // Push the dicNode for look-ahead correction
             if (allowsErrorCorrections && canDoLookAheadCorrection) {
                 traverseSession->getDicTraverseCache()->copyPushNextActive(&dicNode);
             }
@@ -442,7 +242,7 @@
     if (dicNode->getCompoundDistance() >= static_cast<float>(MAX_VALUE_FOR_WEIGHTING)) {
         return;
     }
-    if (!dicNode->isTerminalWordNode()) {
+    if (!dicNode->isTerminalDicNode()) {
         return;
     }
     if (dicNode->shouldBeFilteredBySafetyNetForBigram()) {
@@ -456,6 +256,9 @@
         Weighting::addCostAndForwardInputIndex(WEIGHTING, CT_TERMINAL_INSERTION, traverseSession, 0,
                 &terminalDicNode, traverseSession->getMultiBigramMap());
     }
+    if (!dicNode->hasMatchedOrProximityCodePoints()) {
+        return;
+    }
     Weighting::addCostAndForwardInputIndex(WEIGHTING, CT_TERMINAL, traverseSession, 0,
             &terminalDicNode, traverseSession->getMultiBigramMap());
     traverseSession->getDicTraverseCache()->copyPushTerminal(&terminalDicNode);
@@ -463,7 +266,7 @@
 
 /**
  * Adds the expanded dicNode to the next search priority queue. Also creates an additional next word
- * (by the space omission error correction) search path if input dicNode is on a terminal node.
+ * (by the space omission error correction) search path if input dicNode is on a terminal.
  */
 void Suggest::processExpandedDicNode(
         DicTraverseSession *traverseSession, DicNode *dicNode) const {
@@ -505,7 +308,7 @@
     processExpandedDicNode(traverseSession, childDicNode);
 }
 
-// Process the node codepoint as a digraph. This means that composite glyphs like the German
+// Process the DicNode codepoint as a digraph. This means that composite glyphs like the German
 // u-umlaut is expanded to the transliteration "ue". Note that this happens in parallel with
 // the normal non-digraph traversal, so both "uber" and "ueber" can be corrected to "[u-umlaut]ber".
 void Suggest::processDicNodeAsDigraph(DicTraverseSession *traverseSession,
@@ -518,7 +321,7 @@
 /**
  * Handle the dicNode as an omission error (e.g., ths => this). Skip the current letter and consider
  * matches for all possible next letters. Note that just skipping the current letter without any
- * other conditions tends to flood the search dic nodes cache with omission nodes. Instead, check
+ * other conditions tends to flood the search DicNodes cache with omission DicNodes. Instead, check
  * the possible *next* letters after the omission to better limit search to plausible omissions.
  * Note that apostrophes are handled as omissions.
  */
@@ -605,7 +408,7 @@
 }
 
 /**
- * Weight child node by aligning it to the key
+ * Weight child dicNode by aligning it to the key
  */
 void Suggest::weightChildNode(DicTraverseSession *traverseSession, DicNode *dicNode) const {
     const int inputSize = traverseSession->getInputSize();
diff --git a/native/jni/src/suggest/core/suggest.h b/native/jni/src/suggest/core/suggest.h
index b20343d..5feb04f 100644
--- a/native/jni/src/suggest/core/suggest.h
+++ b/native/jni/src/suggest/core/suggest.h
@@ -55,18 +55,11 @@
     DISALLOW_IMPLICIT_CONSTRUCTORS(Suggest);
     void createNextWordDicNode(DicTraverseSession *traverseSession, DicNode *dicNode,
             const bool spaceSubstitution) const;
-    int outputSuggestions(DicTraverseSession *traverseSession, int *frequencies,
-            int *outputCodePoints, int *outputIndicesToPartialCommit, int *outputTypes,
-            int *outputAutoCommitFirstWordConfidence) const;
-    int computeFirstWordConfidence(const DicNode *const terminalDicNode) const;
     void initializeSearch(DicTraverseSession *traverseSession, int commitPoint) const;
     void expandCurrentDicNodes(DicTraverseSession *traverseSession) const;
     void processTerminalDicNode(DicTraverseSession *traverseSession, DicNode *dicNode) const;
     void processExpandedDicNode(DicTraverseSession *traverseSession, DicNode *dicNode) const;
     void weightChildNode(DicTraverseSession *traverseSession, DicNode *dicNode) const;
-    float getAutocorrectScore(DicTraverseSession *traverseSession, DicNode *dicNode) const;
-    void generateFeatures(
-            DicTraverseSession *traverseSession, DicNode *dicNode, float *features) const;
     void processDicNodeAsOmission(DicTraverseSession *traverseSession, DicNode *dicNode) const;
     void processDicNodeAsDigraph(DicTraverseSession *traverseSession, DicNode *dicNode) const;
     void processDicNodeAsTransposition(DicTraverseSession *traverseSession,
@@ -79,13 +72,8 @@
     void processDicNodeAsMatch(DicTraverseSession *traverseSession,
             DicNode *childDicNode) const;
 
-    // Inputs longer than this will autocorrect if the suggestion is multi-word
-    static const int MIN_LEN_FOR_MULTI_WORD_AUTOCORRECT;
     static const int MIN_CONTINUOUS_SUGGESTION_INPUT_SIZE;
 
-    // Threshold for autocorrection classifier
-    static const float AUTOCORRECT_CLASSIFICATION_THRESHOLD;
-
     const Traversal *const TRAVERSAL;
     const Scoring *const SCORING;
     const Weighting *const WEIGHTING;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.cpp
index 1926b98..7d0d096 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.cpp
@@ -16,7 +16,6 @@
 
 #include "suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.h"
 
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
 #include "suggest/policyimpl/dictionary/utils/byte_array_utils.h"
 #include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
 
@@ -38,7 +37,6 @@
 // Mask for attribute probability, stored on 4 bits inside the flags byte.
 const BigramListReadWriteUtils::BigramFlags
         BigramListReadWriteUtils::MASK_ATTRIBUTE_PROBABILITY = 0x0F;
-const int BigramListReadWriteUtils::ATTRIBUTE_ADDRESS_SHIFT = 4;
 
 /* static */ void BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(
         const uint8_t *const bigramsBuf, BigramFlags *const outBigramFlags,
@@ -79,11 +77,6 @@
             offset = ByteArrayUtils::readUint24AndAdvancePosition(bigramsBuf, pos);
             break;
     }
-    if (offset == DynamicPatriciaTrieReadingUtils::DICT_OFFSET_INVALID) {
-        return NOT_A_DICT_POS;
-    } else if (offset == DynamicPatriciaTrieReadingUtils::DICT_OFFSET_ZERO_OFFSET) {
-        return origin;
-    }
     if (isOffsetNegative(flags)) {
         return origin - offset;
     } else {
@@ -91,92 +84,4 @@
     }
 }
 
-/* static */ bool BigramListReadWriteUtils::setHasNextFlag(
-        BufferWithExtendableBuffer *const buffer, const bool hasNext, const int entryPos) {
-    const bool usesAdditionalBuffer = buffer->isInAdditionalBuffer(entryPos);
-    int readingPos = entryPos;
-    if (usesAdditionalBuffer) {
-        readingPos -= buffer->getOriginalBufferSize();
-    }
-    BigramFlags bigramFlags = ByteArrayUtils::readUint8AndAdvancePosition(
-            buffer->getBuffer(usesAdditionalBuffer), &readingPos);
-    if (hasNext) {
-        bigramFlags = bigramFlags | FLAG_ATTRIBUTE_HAS_NEXT;
-    } else {
-        bigramFlags = bigramFlags & (~FLAG_ATTRIBUTE_HAS_NEXT);
-    }
-    int writingPos = entryPos;
-    return buffer->writeUintAndAdvancePosition(bigramFlags, 1 /* size */, &writingPos);
-}
-
-/* static */ bool BigramListReadWriteUtils::createAndWriteBigramEntry(
-        BufferWithExtendableBuffer *const buffer, const int targetPos, const int probability,
-        const bool hasNext, int *const writingPos) {
-    BigramFlags flags;
-    if (!createAndGetBigramFlags(*writingPos, targetPos, probability, hasNext, &flags)) {
-        return false;
-    }
-    return writeBigramEntry(buffer, flags, targetPos, writingPos);
-}
-
-/* static */ bool BigramListReadWriteUtils::writeBigramEntry(
-        BufferWithExtendableBuffer *const bufferToWrite, const BigramFlags flags,
-        const int targetPtNodePos, int *const writingPos) {
-    const int offset = getBigramTargetOffset(targetPtNodePos, *writingPos);
-    const BigramFlags flagsToWrite = (offset < 0) ?
-            (flags | FLAG_ATTRIBUTE_OFFSET_NEGATIVE) : (flags & ~FLAG_ATTRIBUTE_OFFSET_NEGATIVE);
-    if (!bufferToWrite->writeUintAndAdvancePosition(flagsToWrite, 1 /* size */, writingPos)) {
-        return false;
-    }
-    const uint32_t absOffest = abs(offset);
-    const int bigramTargetFieldSize = attributeAddressSize(flags);
-    return bufferToWrite->writeUintAndAdvancePosition(absOffest, bigramTargetFieldSize,
-            writingPos);
-}
-
-// Returns true if the bigram entry is valid and put entry flags into out*.
-/* static */ bool BigramListReadWriteUtils::createAndGetBigramFlags(const int entryPos,
-        const int targetPtNodePos, const int probability, const bool hasNext,
-        BigramFlags *const outBigramFlags) {
-    BigramFlags flags = probability & MASK_ATTRIBUTE_PROBABILITY;
-    if (hasNext) {
-        flags |= FLAG_ATTRIBUTE_HAS_NEXT;
-    }
-    const int offset = getBigramTargetOffset(targetPtNodePos, entryPos);
-    if (offset < 0) {
-        flags |= FLAG_ATTRIBUTE_OFFSET_NEGATIVE;
-    }
-    const uint32_t absOffest = abs(offset);
-    if ((absOffest >> 24) != 0) {
-        // Offset is too large.
-        return false;
-    } else if ((absOffest >> 16) != 0) {
-        flags |= FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES;
-    } else if ((absOffest >> 8) != 0) {
-        flags |= FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES;
-    } else {
-        flags |= FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE;
-    }
-    // Currently, all newly written bigram position fields are 3 bytes to simplify dictionary
-    // writing.
-    // TODO: Remove following 2 lines and optimize memory space.
-    flags = (flags & (~MASK_ATTRIBUTE_ADDRESS_TYPE)) | FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES;
-    *outBigramFlags = flags;
-    return true;
-}
-
-/* static */ int BigramListReadWriteUtils::getBigramTargetOffset(const int targetPtNodePos,
-        const int entryPos) {
-    if (targetPtNodePos == NOT_A_DICT_POS) {
-        return DynamicPatriciaTrieReadingUtils::DICT_OFFSET_INVALID;
-    } else {
-        const int offset = targetPtNodePos - (entryPos + 1 /* bigramFlagsField */);
-        if (offset == 0) {
-            return DynamicPatriciaTrieReadingUtils::DICT_OFFSET_ZERO_OFFSET;
-        } else {
-            return offset;
-        }
-    }
-}
-
 } // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.h b/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.h
index eabe4e0..7e10383 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.h
@@ -45,34 +45,6 @@
    // Bigrams reading methods
    static void skipExistingBigrams(const uint8_t *const bigramsBuf, int *const bigramListPos);
 
-   // Returns the size of the bigram position field that is stored in bigram flags.
-   static AK_FORCE_INLINE int attributeAddressSize(const BigramFlags flags) {
-       return (flags & MASK_ATTRIBUTE_ADDRESS_TYPE) >> ATTRIBUTE_ADDRESS_SHIFT;
-       /* Note: this is a value-dependant optimization of what may probably be
-          more readably written this way:
-          switch (flags * BinaryFormat::MASK_ATTRIBUTE_ADDRESS_TYPE) {
-          case FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE: return 1;
-          case FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES: return 2;
-          case FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTE: return 3;
-          default: return 0;
-          }
-       */
-   }
-
-   static bool setHasNextFlag(BufferWithExtendableBuffer *const buffer,
-           const bool hasNext, const int entryPos);
-
-   static AK_FORCE_INLINE BigramFlags setProbabilityInFlags(const BigramFlags flags,
-           const int probability) {
-       return (flags & (~MASK_ATTRIBUTE_PROBABILITY)) | (probability & MASK_ATTRIBUTE_PROBABILITY);
-   }
-
-   static bool createAndWriteBigramEntry(BufferWithExtendableBuffer *const buffer,
-           const int targetPos, const int probability, const bool hasNext, int *const writingPos);
-
-   static bool writeBigramEntry(BufferWithExtendableBuffer *const buffer, const BigramFlags flags,
-           const int targetOffset, int *const writingPos);
-
 private:
    DISALLOW_IMPLICIT_CONSTRUCTORS(BigramListReadWriteUtils);
 
@@ -83,11 +55,6 @@
    static const BigramFlags FLAG_ATTRIBUTE_OFFSET_NEGATIVE;
    static const BigramFlags FLAG_ATTRIBUTE_HAS_NEXT;
    static const BigramFlags MASK_ATTRIBUTE_PROBABILITY;
-   static const int ATTRIBUTE_ADDRESS_SHIFT;
-
-   // Returns true if the bigram entry is valid and put entry flags into out*.
-   static bool createAndGetBigramFlags(const int entryPos, const int targetPos,
-           const int probability, const bool hasNext, BigramFlags *const outBigramFlags);
 
    static AK_FORCE_INLINE bool isOffsetNegative(const BigramFlags flags) {
        return (flags & FLAG_ATTRIBUTE_OFFSET_NEGATIVE) != 0;
@@ -95,8 +62,6 @@
 
    static int getBigramAddressAndAdvancePosition(const uint8_t *const bigramsBuf,
            const BigramFlags flags, int *const pos);
-
-   static int getBigramTargetOffset(const int targetPtNodePos, const int entryPos);
 };
 } // namespace latinime
 #endif // LATINIME_BIGRAM_LIST_READ_WRITE_UTILS_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.cpp
deleted file mode 100644
index b1170e2..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.cpp
+++ /dev/null
@@ -1,391 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h"
-
-#include "suggest/core/policy/dictionary_shortcuts_structure_policy.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h"
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
-
-namespace latinime {
-
-const int DynamicBigramListPolicy::CONTINUING_BIGRAM_LINK_COUNT_LIMIT = 10000;
-const int DynamicBigramListPolicy::BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT = 100000;
-
-void DynamicBigramListPolicy::getNextBigram(int *const outBigramPos, int *const outProbability,
-        bool *const outHasNext, int *const bigramEntryPos) const {
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*bigramEntryPos);
-    const uint8_t *const buffer = mBuffer->getBuffer(usesAdditionalBuffer);
-    if (usesAdditionalBuffer) {
-        *bigramEntryPos -= mBuffer->getOriginalBufferSize();
-    }
-    BigramListReadWriteUtils::BigramFlags bigramFlags;
-    int originalBigramPos;
-    BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(buffer, &bigramFlags,
-            &originalBigramPos, bigramEntryPos);
-    if (usesAdditionalBuffer && originalBigramPos != NOT_A_DICT_POS) {
-        originalBigramPos += mBuffer->getOriginalBufferSize();
-    }
-    *outProbability = BigramListReadWriteUtils::getProbabilityFromFlags(bigramFlags);
-    *outHasNext = BigramListReadWriteUtils::hasNext(bigramFlags);
-    if (mIsDecayingDict && !ForgettingCurveUtils::isValidEncodedProbability(*outProbability)) {
-        // This bigram is too weak to output.
-        *outBigramPos = NOT_A_DICT_POS;
-    } else {
-        *outBigramPos = followBigramLinkAndGetCurrentBigramPtNodePos(originalBigramPos);
-    }
-    if (usesAdditionalBuffer) {
-        *bigramEntryPos += mBuffer->getOriginalBufferSize();
-    }
-}
-
-void DynamicBigramListPolicy::skipAllBigrams(int *const bigramListPos) const {
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*bigramListPos);
-    const uint8_t *const buffer = mBuffer->getBuffer(usesAdditionalBuffer);
-    if (usesAdditionalBuffer) {
-        *bigramListPos -= mBuffer->getOriginalBufferSize();
-    }
-    BigramListReadWriteUtils::skipExistingBigrams(buffer, bigramListPos);
-    if (usesAdditionalBuffer) {
-        *bigramListPos += mBuffer->getOriginalBufferSize();
-    }
-}
-
-bool DynamicBigramListPolicy::copyAllBigrams(BufferWithExtendableBuffer *const bufferToWrite,
-        int *const fromPos, int *const toPos, int *const outBigramsCount) const {
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*fromPos);
-    if (usesAdditionalBuffer) {
-        *fromPos -= mBuffer->getOriginalBufferSize();
-    }
-    *outBigramsCount = 0;
-    BigramListReadWriteUtils::BigramFlags bigramFlags;
-    int bigramEntryCount = 0;
-    int lastWrittenEntryPos = NOT_A_DICT_POS;
-    do {
-        if (++bigramEntryCount > BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT) {
-            AKLOGE("Too many bigram entries. Entry count: %d, Limit: %d",
-                    bigramEntryCount, BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT);
-            ASSERT(false);
-            return false;
-        }
-        // The buffer address can be changed after calling buffer writing methods.
-        int originalBigramPos;
-        BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(
-                mBuffer->getBuffer(usesAdditionalBuffer), &bigramFlags, &originalBigramPos,
-                fromPos);
-        if (originalBigramPos == NOT_A_DICT_POS) {
-            // skip invalid bigram entry.
-            continue;
-        }
-        if (usesAdditionalBuffer) {
-            originalBigramPos += mBuffer->getOriginalBufferSize();
-        }
-        const int bigramPos = followBigramLinkAndGetCurrentBigramPtNodePos(originalBigramPos);
-        if (bigramPos == NOT_A_DICT_POS) {
-            // Target PtNode has been invalidated.
-            continue;
-        }
-        lastWrittenEntryPos = *toPos;
-        if (!BigramListReadWriteUtils::createAndWriteBigramEntry(bufferToWrite, bigramPos,
-                BigramListReadWriteUtils::getProbabilityFromFlags(bigramFlags),
-                BigramListReadWriteUtils::hasNext(bigramFlags), toPos)) {
-            return false;
-        }
-        (*outBigramsCount)++;
-    } while(BigramListReadWriteUtils::hasNext(bigramFlags));
-    // Makes the last entry the terminal of the list. Updates the flags.
-    if (lastWrittenEntryPos != NOT_A_DICT_POS) {
-        if (!BigramListReadWriteUtils::setHasNextFlag(bufferToWrite, false /* hasNext */,
-                lastWrittenEntryPos)) {
-            return false;
-        }
-    }
-    if (usesAdditionalBuffer) {
-        *fromPos += mBuffer->getOriginalBufferSize();
-    }
-    return true;
-}
-
-// Finding useless bigram entries and remove them. Bigram entry is useless when the target PtNode
-// has been deleted or is not a valid terminal.
-bool DynamicBigramListPolicy::updateAllBigramEntriesAndDeleteUselessEntries(
-        int *const bigramListPos, int *const outValidBigramEntryCount) {
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*bigramListPos);
-    if (usesAdditionalBuffer) {
-        *bigramListPos -= mBuffer->getOriginalBufferSize();
-    }
-    DynamicPatriciaTrieNodeReader nodeReader(mBuffer, this /* bigramsPolicy */, mShortcutPolicy);
-    BigramListReadWriteUtils::BigramFlags bigramFlags;
-    int bigramEntryCount = 0;
-    do {
-        if (++bigramEntryCount > BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT) {
-            AKLOGE("Too many bigram entries. Entry count: %d, Limit: %d",
-                    bigramEntryCount, BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT);
-            ASSERT(false);
-            return false;
-        }
-        int bigramEntryPos = *bigramListPos;
-        int originalBigramPos;
-        // The buffer address can be changed after calling buffer writing methods.
-        BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(
-                mBuffer->getBuffer(usesAdditionalBuffer), &bigramFlags, &originalBigramPos,
-                bigramListPos);
-        if (usesAdditionalBuffer) {
-            bigramEntryPos += mBuffer->getOriginalBufferSize();
-        }
-        if (originalBigramPos == NOT_A_DICT_POS) {
-            // This entry has already been removed.
-            continue;
-        }
-        if (usesAdditionalBuffer) {
-            originalBigramPos += mBuffer->getOriginalBufferSize();
-        }
-        const int bigramTargetNodePos =
-                followBigramLinkAndGetCurrentBigramPtNodePos(originalBigramPos);
-        nodeReader.fetchNodeInfoInBufferFromPtNodePos(bigramTargetNodePos);
-        if (nodeReader.isDeleted() || !nodeReader.isTerminal()
-                || bigramTargetNodePos == NOT_A_DICT_POS) {
-            // The target is no longer valid terminal. Invalidate the current bigram entry.
-            if (!BigramListReadWriteUtils::writeBigramEntry(mBuffer, bigramFlags,
-                    NOT_A_DICT_POS /* targetPtNodePos */, &bigramEntryPos)) {
-                return false;
-            }
-            continue;
-        }
-        bool isRemoved = false;
-        if (!updateProbabilityForDecay(bigramFlags, bigramTargetNodePos, &bigramEntryPos,
-                &isRemoved)) {
-            return false;
-        }
-        if (!isRemoved) {
-            (*outValidBigramEntryCount) += 1;
-        }
-    } while(BigramListReadWriteUtils::hasNext(bigramFlags));
-    return true;
-}
-
-// Updates bigram target PtNode positions in the list after the placing step in GC.
-bool DynamicBigramListPolicy::updateAllBigramTargetPtNodePositions(int *const bigramListPos,
-        const DynamicPatriciaTrieWritingHelper::PtNodePositionRelocationMap *const
-                ptNodePositionRelocationMap, int *const outBigramEntryCount) {
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*bigramListPos);
-    if (usesAdditionalBuffer) {
-        *bigramListPos -= mBuffer->getOriginalBufferSize();
-    }
-    BigramListReadWriteUtils::BigramFlags bigramFlags;
-    int bigramEntryCount = 0;
-    do {
-        if (++bigramEntryCount > BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT) {
-            AKLOGE("Too many bigram entries. Entry count: %d, Limit: %d",
-                    bigramEntryCount, BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT);
-            ASSERT(false);
-            return false;
-        }
-        int bigramEntryPos = *bigramListPos;
-        if (usesAdditionalBuffer) {
-            bigramEntryPos += mBuffer->getOriginalBufferSize();
-        }
-        int bigramTargetPtNodePos;
-        // The buffer address can be changed after calling buffer writing methods.
-        BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(
-                mBuffer->getBuffer(usesAdditionalBuffer), &bigramFlags, &bigramTargetPtNodePos,
-                bigramListPos);
-        if (bigramTargetPtNodePos == NOT_A_DICT_POS) {
-            continue;
-        }
-        if (usesAdditionalBuffer) {
-            bigramTargetPtNodePos += mBuffer->getOriginalBufferSize();
-        }
-
-        DynamicPatriciaTrieWritingHelper::PtNodePositionRelocationMap::const_iterator it =
-                ptNodePositionRelocationMap->find(bigramTargetPtNodePos);
-        if (it != ptNodePositionRelocationMap->end()) {
-            bigramTargetPtNodePos = it->second;
-        } else {
-            bigramTargetPtNodePos = NOT_A_DICT_POS;
-        }
-        if (!BigramListReadWriteUtils::writeBigramEntry(mBuffer, bigramFlags,
-                bigramTargetPtNodePos, &bigramEntryPos)) {
-            return false;
-        }
-    } while(BigramListReadWriteUtils::hasNext(bigramFlags));
-    (*outBigramEntryCount) = bigramEntryCount;
-    return true;
-}
-
-bool DynamicBigramListPolicy::addNewBigramEntryToBigramList(const int bigramTargetPos,
-        const int probability, int *const bigramListPos, bool *const outAddedNewBigram) {
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*bigramListPos);
-    if (usesAdditionalBuffer) {
-        *bigramListPos -= mBuffer->getOriginalBufferSize();
-    }
-    BigramListReadWriteUtils::BigramFlags bigramFlags;
-    int bigramEntryCount = 0;
-    do {
-        if (++bigramEntryCount > BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT) {
-            AKLOGE("Too many bigram entries. Entry count: %d, Limit: %d",
-                    bigramEntryCount, BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT);
-            ASSERT(false);
-            return false;
-        }
-        int entryPos = *bigramListPos;
-        if (usesAdditionalBuffer) {
-            entryPos += mBuffer->getOriginalBufferSize();
-        }
-        int originalBigramPos;
-        // The buffer address can be changed after calling buffer writing methods.
-        BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(
-                mBuffer->getBuffer(usesAdditionalBuffer), &bigramFlags, &originalBigramPos,
-                bigramListPos);
-        if (usesAdditionalBuffer && originalBigramPos != NOT_A_DICT_POS) {
-            originalBigramPos += mBuffer->getOriginalBufferSize();
-        }
-        if (followBigramLinkAndGetCurrentBigramPtNodePos(originalBigramPos) == bigramTargetPos) {
-            // Update this bigram entry.
-            *outAddedNewBigram = false;
-            const int originalProbability = BigramListReadWriteUtils::getProbabilityFromFlags(
-                    bigramFlags);
-            const int probabilityToWrite = mIsDecayingDict ?
-                    ForgettingCurveUtils::getUpdatedEncodedProbability(originalProbability,
-                            probability) : probability;
-            const BigramListReadWriteUtils::BigramFlags updatedFlags =
-                    BigramListReadWriteUtils::setProbabilityInFlags(bigramFlags,
-                            probabilityToWrite);
-            return BigramListReadWriteUtils::writeBigramEntry(mBuffer, updatedFlags,
-                    originalBigramPos, &entryPos);
-        }
-        if (BigramListReadWriteUtils::hasNext(bigramFlags)) {
-            continue;
-        }
-        // The current last entry is found.
-        // First, update the flags of the last entry.
-        if (!BigramListReadWriteUtils::setHasNextFlag(mBuffer, true /* hasNext */, entryPos)) {
-            *outAddedNewBigram = false;
-            return false;
-        }
-        if (usesAdditionalBuffer) {
-            *bigramListPos += mBuffer->getOriginalBufferSize();
-        }
-        // Then, add a new entry after the last entry.
-        *outAddedNewBigram = true;
-        return writeNewBigramEntry(bigramTargetPos, probability, bigramListPos);
-    } while(BigramListReadWriteUtils::hasNext(bigramFlags));
-    // We return directly from the while loop.
-    ASSERT(false);
-    return false;
-}
-
-bool DynamicBigramListPolicy::writeNewBigramEntry(const int bigramTargetPos, const int probability,
-        int *const writingPos) {
-    // hasNext is false because we are adding a new bigram entry at the end of the bigram list.
-    const int probabilityToWrite = mIsDecayingDict ?
-            ForgettingCurveUtils::getUpdatedEncodedProbability(NOT_A_PROBABILITY, probability) :
-                    probability;
-    return BigramListReadWriteUtils::createAndWriteBigramEntry(mBuffer, bigramTargetPos,
-            probabilityToWrite, false /* hasNext */, writingPos);
-}
-
-bool DynamicBigramListPolicy::removeBigram(const int bigramListPos, const int bigramTargetPos) {
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(bigramListPos);
-    int pos = bigramListPos;
-    if (usesAdditionalBuffer) {
-        pos -= mBuffer->getOriginalBufferSize();
-    }
-    BigramListReadWriteUtils::BigramFlags bigramFlags;
-    int bigramEntryCount = 0;
-    do {
-        if (++bigramEntryCount > BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT) {
-            AKLOGE("Too many bigram entries. Entry count: %d, Limit: %d",
-                    bigramEntryCount, BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT);
-            ASSERT(false);
-            return false;
-        }
-        int bigramEntryPos = pos;
-        int originalBigramPos;
-        // The buffer address can be changed after calling buffer writing methods.
-        BigramListReadWriteUtils::getBigramEntryPropertiesAndAdvancePosition(
-                mBuffer->getBuffer(usesAdditionalBuffer), &bigramFlags, &originalBigramPos, &pos);
-        if (usesAdditionalBuffer) {
-            bigramEntryPos += mBuffer->getOriginalBufferSize();
-        }
-        if (usesAdditionalBuffer && originalBigramPos != NOT_A_DICT_POS) {
-            originalBigramPos += mBuffer->getOriginalBufferSize();
-        }
-        const int bigramPos = followBigramLinkAndGetCurrentBigramPtNodePos(originalBigramPos);
-        if (bigramPos != bigramTargetPos) {
-            continue;
-        }
-        // Target entry is found. Write an invalid target position to mark the bigram invalid.
-        return BigramListReadWriteUtils::writeBigramEntry(mBuffer, bigramFlags,
-                NOT_A_DICT_POS /* targetOffset */, &bigramEntryPos);
-    } while(BigramListReadWriteUtils::hasNext(bigramFlags));
-    return false;
-}
-
-int DynamicBigramListPolicy::followBigramLinkAndGetCurrentBigramPtNodePos(
-        const int originalBigramPos) const {
-    if (originalBigramPos == NOT_A_DICT_POS) {
-        return NOT_A_DICT_POS;
-    }
-    int currentPos = originalBigramPos;
-    DynamicPatriciaTrieNodeReader nodeReader(mBuffer, this /* bigramsPolicy */, mShortcutPolicy);
-    nodeReader.fetchNodeInfoInBufferFromPtNodePos(currentPos);
-    int bigramLinkCount = 0;
-    while (nodeReader.getBigramLinkedNodePos() != NOT_A_DICT_POS) {
-        currentPos = nodeReader.getBigramLinkedNodePos();
-        nodeReader.fetchNodeInfoInBufferFromPtNodePos(currentPos);
-        bigramLinkCount++;
-        if (bigramLinkCount > CONTINUING_BIGRAM_LINK_COUNT_LIMIT) {
-            AKLOGE("Bigram link is invalid. start position: %d", originalBigramPos);
-            ASSERT(false);
-            return NOT_A_DICT_POS;
-        }
-    }
-    return currentPos;
-}
-
-bool DynamicBigramListPolicy::updateProbabilityForDecay(
-        const BigramListReadWriteUtils::BigramFlags bigramFlags, const int targetPtNodePos,
-        int *const bigramEntryPos, bool *const outRemoved) const {
-    *outRemoved = false;
-    if (mIsDecayingDict) {
-        // Update bigram probability for decaying.
-        const int newProbability = ForgettingCurveUtils::getEncodedProbabilityToSave(
-                BigramListReadWriteUtils::getProbabilityFromFlags(bigramFlags), mHeaderPolicy);
-        if (ForgettingCurveUtils::isValidEncodedProbability(newProbability)) {
-            // Write new probability.
-            const BigramListReadWriteUtils::BigramFlags updatedBigramFlags =
-                    BigramListReadWriteUtils::setProbabilityInFlags(
-                            bigramFlags, newProbability);
-            if (!BigramListReadWriteUtils::writeBigramEntry(mBuffer, updatedBigramFlags,
-                    targetPtNodePos, bigramEntryPos)) {
-                return false;
-            }
-        } else {
-            // Remove current bigram entry.
-            *outRemoved = true;
-            if (!BigramListReadWriteUtils::writeBigramEntry(mBuffer, bigramFlags,
-                    NOT_A_DICT_POS /* targetPtNodePos */, bigramEntryPos)) {
-                return false;
-            }
-        }
-    }
-    return true;
-}
-
-} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h b/native/jni/src/suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h
deleted file mode 100644
index 0504b59..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_DYNAMIC_BIGRAM_LIST_POLICY_H
-#define LATINIME_DYNAMIC_BIGRAM_LIST_POLICY_H
-
-#include <stdint.h>
-
-#include "defines.h"
-#include "suggest/core/policy/dictionary_bigrams_structure_policy.h"
-#include "suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h"
-
-namespace latinime {
-
-class BufferWithExtendableBuffer;
-class DictionaryHeaderStructurePolicy;
-class DictionaryShortcutsStructurePolicy;
-
-/*
- * This is a dynamic version of BigramListPolicy and supports an additional buffer.
- */
-class DynamicBigramListPolicy : public DictionaryBigramsStructurePolicy {
- public:
-    DynamicBigramListPolicy(const DictionaryHeaderStructurePolicy *const headerPolicy,
-            BufferWithExtendableBuffer *const buffer,
-            const DictionaryShortcutsStructurePolicy *const shortcutPolicy,
-            const bool isDecayingDict)
-            : mHeaderPolicy(headerPolicy), mBuffer(buffer), mShortcutPolicy(shortcutPolicy),
-              mIsDecayingDict(isDecayingDict) {}
-
-    ~DynamicBigramListPolicy() {}
-
-    void getNextBigram(int *const outBigramPos, int *const outProbability, bool *const outHasNext,
-            int *const bigramEntryPos) const;
-
-    void skipAllBigrams(int *const bigramListPos) const;
-
-    // Copy bigrams from the bigram list that starts at fromPos in mBuffer to toPos in
-    // bufferToWrite and advance these positions after bigram lists. This method skips invalid
-    // bigram entries and write the valid bigram entry count to outBigramsCount.
-    bool copyAllBigrams(BufferWithExtendableBuffer *const bufferToWrite, int *const fromPos,
-            int *const toPos, int *const outBigramsCount) const;
-
-    bool updateAllBigramEntriesAndDeleteUselessEntries(int *const bigramListPos,
-            int *const outBigramEntryCount);
-
-    bool updateAllBigramTargetPtNodePositions(int *const bigramListPos,
-            const DynamicPatriciaTrieWritingHelper::PtNodePositionRelocationMap *const
-                    ptNodePositionRelocationMap, int *const outValidBigramEntryCount);
-
-    bool addNewBigramEntryToBigramList(const int bigramTargetPos, const int probability,
-            int *const bigramListPos, bool *const outAddedNewBigram);
-
-    bool writeNewBigramEntry(const int bigramTargetPos, const int probability,
-            int *const writingPos);
-
-    // Return whether or not targetBigramPos is found.
-    bool removeBigram(const int bigramListPos, const int bigramTargetPos);
-
- private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicBigramListPolicy);
-
-    static const int CONTINUING_BIGRAM_LINK_COUNT_LIMIT;
-    static const int BIGRAM_ENTRY_COUNT_IN_A_BIGRAM_LIST_LIMIT;
-
-    const DictionaryHeaderStructurePolicy *const mHeaderPolicy;
-    BufferWithExtendableBuffer *const mBuffer;
-    const DictionaryShortcutsStructurePolicy *const mShortcutPolicy;
-    const bool mIsDecayingDict;
-
-    // Follow bigram link and return the position of bigram target PtNode that is currently valid.
-    int followBigramLinkAndGetCurrentBigramPtNodePos(const int originalBigramPos) const;
-
-    bool updateProbabilityForDecay(const BigramListReadWriteUtils::BigramFlags bigramFlags,
-            const int targetPtNodePos, int *const bigramEntryPos, bool *const outRemoved) const;
-};
-} // namespace latinime
-#endif // LATINIME_DYNAMIC_BIGRAM_LIST_POLICY_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.cpp
new file mode 100644
index 0000000..cd22430
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.cpp
@@ -0,0 +1,240 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.h"
+
+#include "suggest/policyimpl/dictionary/bigram/bigram_list_read_write_utils.h"
+#include "suggest/policyimpl/dictionary/header/header_policy.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
+
+namespace latinime {
+
+void Ver4BigramListPolicy::getNextBigram(int *const outBigramPos, int *const outProbability,
+        bool *const outHasNext, int *const bigramEntryPos) const {
+    const BigramEntry bigramEntry =
+            mBigramDictContent->getBigramEntryAndAdvancePosition(bigramEntryPos);
+    if (outBigramPos) {
+        // Lookup target PtNode position.
+        *outBigramPos = mTerminalPositionLookupTable->getTerminalPtNodePosition(
+                bigramEntry.getTargetTerminalId());
+    }
+    if (outProbability) {
+        if (bigramEntry.hasHistoricalInfo()) {
+            *outProbability =
+                    ForgettingCurveUtils::decodeProbability(bigramEntry.getHistoricalInfo());
+        } else {
+            *outProbability = bigramEntry.getProbability();
+        }
+    }
+    if (outHasNext) {
+        *outHasNext = bigramEntry.hasNext();
+    }
+}
+
+bool Ver4BigramListPolicy::addNewEntry(const int terminalId, const int newTargetTerminalId,
+        const int newProbability, const int timestamp, bool *const outAddedNewEntry) {
+    if (outAddedNewEntry) {
+        *outAddedNewEntry = false;
+    }
+    const int bigramListPos = mBigramDictContent->getBigramListHeadPos(terminalId);
+    if (bigramListPos == NOT_A_DICT_POS) {
+        // Updating PtNode doesn't have a bigram list.
+        // Create new bigram list.
+        if (!mBigramDictContent->createNewBigramList(terminalId)) {
+            return false;
+        }
+        const BigramEntry newBigramEntry(false /* hasNext */, NOT_A_PROBABILITY,
+                newTargetTerminalId);
+        const BigramEntry bigramEntryToWrite = createUpdatedBigramEntryFrom(&newBigramEntry,
+                newProbability, timestamp);
+        // Write an entry.
+        const int writingPos =  mBigramDictContent->getBigramListHeadPos(terminalId);
+        if (!mBigramDictContent->writeBigramEntry(&bigramEntryToWrite, writingPos)) {
+            return false;
+        }
+        if (outAddedNewEntry) {
+            *outAddedNewEntry = true;
+        }
+        return true;
+    }
+
+    const int entryPosToUpdate = getEntryPosToUpdate(newTargetTerminalId, bigramListPos);
+    if (entryPosToUpdate != NOT_A_DICT_POS) {
+        // Overwrite existing entry.
+        const BigramEntry originalBigramEntry =
+                mBigramDictContent->getBigramEntry(entryPosToUpdate);
+        if (!originalBigramEntry.isValid()) {
+            // Reuse invalid entry.
+            if (outAddedNewEntry) {
+                *outAddedNewEntry = true;
+            }
+        }
+        const BigramEntry updatedBigramEntry =
+                originalBigramEntry.updateTargetTerminalIdAndGetEntry(newTargetTerminalId);
+        const BigramEntry bigramEntryToWrite = createUpdatedBigramEntryFrom(
+                &updatedBigramEntry, newProbability, timestamp);
+        return mBigramDictContent->writeBigramEntry(&bigramEntryToWrite, entryPosToUpdate);
+    }
+
+    // Add new entry to the bigram list.
+    // Create new bigram list.
+    if (!mBigramDictContent->createNewBigramList(terminalId)) {
+        return false;
+    }
+    // Write new entry at a head position of the bigram list.
+    int writingPos = mBigramDictContent->getBigramListHeadPos(terminalId);
+    const BigramEntry newBigramEntry(true /* hasNext */, NOT_A_PROBABILITY, newTargetTerminalId);
+    const BigramEntry bigramEntryToWrite = createUpdatedBigramEntryFrom(
+            &newBigramEntry, newProbability, timestamp);
+    if (!mBigramDictContent->writeBigramEntryAndAdvancePosition(&bigramEntryToWrite, &writingPos)) {
+        return false;
+    }
+    if (outAddedNewEntry) {
+        *outAddedNewEntry = true;
+    }
+    // Append existing entries by copying.
+    return mBigramDictContent->copyBigramList(bigramListPos, writingPos);
+}
+
+bool Ver4BigramListPolicy::removeEntry(const int terminalId, const int targetTerminalId) {
+    const int bigramListPos = mBigramDictContent->getBigramListHeadPos(terminalId);
+    if (bigramListPos == NOT_A_DICT_POS) {
+        // Bigram list doesn't exist.
+        return false;
+    }
+    const int entryPosToUpdate = getEntryPosToUpdate(targetTerminalId, bigramListPos);
+    if (entryPosToUpdate == NOT_A_DICT_POS) {
+        // Bigram entry doesn't exist.
+        return false;
+    }
+    const BigramEntry bigramEntry = mBigramDictContent->getBigramEntry(entryPosToUpdate);
+    if (targetTerminalId != bigramEntry.getTargetTerminalId()) {
+        // Bigram entry doesn't exist.
+        return false;
+    }
+    // Remove bigram entry by marking it as invalid entry and overwriting the original entry.
+    const BigramEntry updatedBigramEntry = bigramEntry.getInvalidatedEntry();
+    return mBigramDictContent->writeBigramEntry(&updatedBigramEntry, entryPosToUpdate);
+}
+
+bool Ver4BigramListPolicy::updateAllBigramEntriesAndDeleteUselessEntries(const int terminalId,
+        int *const outBigramCount) {
+    const int bigramListPos = mBigramDictContent->getBigramListHeadPos(terminalId);
+    if (bigramListPos == NOT_A_DICT_POS) {
+        // Bigram list doesn't exist.
+        return true;
+    }
+    bool hasNext = true;
+    int readingPos = bigramListPos;
+    while (hasNext) {
+        const int entryPos = readingPos;
+        const BigramEntry bigramEntry =
+                mBigramDictContent->getBigramEntryAndAdvancePosition(&readingPos);
+        hasNext = bigramEntry.hasNext();
+        if (!bigramEntry.isValid()) {
+            continue;
+        }
+        const int targetPtNodePos = mTerminalPositionLookupTable->getTerminalPtNodePosition(
+                bigramEntry.getTargetTerminalId());
+        if (targetPtNodePos == NOT_A_DICT_POS) {
+            // Invalidate bigram entry.
+            const BigramEntry updatedBigramEntry = bigramEntry.getInvalidatedEntry();
+            if (!mBigramDictContent->writeBigramEntry(&updatedBigramEntry, entryPos)) {
+                return false;
+            }
+        } else if (bigramEntry.hasHistoricalInfo()) {
+            const HistoricalInfo historicalInfo = ForgettingCurveUtils::createHistoricalInfoToSave(
+                    bigramEntry.getHistoricalInfo());
+            if (ForgettingCurveUtils::needsToKeep(&historicalInfo)) {
+                const BigramEntry updatedBigramEntry =
+                        bigramEntry.updateHistoricalInfoAndGetEntry(&historicalInfo);
+                if (!mBigramDictContent->writeBigramEntry(&updatedBigramEntry, entryPos)) {
+                    return false;
+                }
+                *outBigramCount += 1;
+            } else {
+                // Remove entry.
+                const BigramEntry updatedBigramEntry = bigramEntry.getInvalidatedEntry();
+                if (!mBigramDictContent->writeBigramEntry(&updatedBigramEntry, entryPos)) {
+                    return false;
+                }
+            }
+        } else {
+            *outBigramCount += 1;
+        }
+    }
+    return true;
+}
+
+int Ver4BigramListPolicy::getBigramEntryConut(const int terminalId) {
+    const int bigramListPos = mBigramDictContent->getBigramListHeadPos(terminalId);
+    if (bigramListPos == NOT_A_DICT_POS) {
+        // Bigram list doesn't exist.
+        return 0;
+    }
+    int bigramCount = 0;
+    bool hasNext = true;
+    int readingPos = bigramListPos;
+    while (hasNext) {
+        const BigramEntry bigramEntry =
+                mBigramDictContent->getBigramEntryAndAdvancePosition(&readingPos);
+        hasNext = bigramEntry.hasNext();
+        if (bigramEntry.isValid()) {
+            bigramCount++;
+        }
+    }
+    return bigramCount;
+}
+
+int Ver4BigramListPolicy::getEntryPosToUpdate(const int targetTerminalIdToFind,
+        const int bigramListPos) const {
+    bool hasNext = true;
+    int invalidEntryPos = NOT_A_DICT_POS;
+    int readingPos = bigramListPos;
+    while (hasNext) {
+        const int entryPos = readingPos;
+        const BigramEntry bigramEntry =
+                mBigramDictContent->getBigramEntryAndAdvancePosition(&readingPos);
+        hasNext = bigramEntry.hasNext();
+        if (bigramEntry.getTargetTerminalId() == targetTerminalIdToFind) {
+            // Entry with same target is found.
+            return entryPos;
+        } else if (!bigramEntry.isValid()) {
+            // Invalid entry that can be reused is found.
+            invalidEntryPos = entryPos;
+        }
+    }
+    return invalidEntryPos;
+}
+
+const BigramEntry Ver4BigramListPolicy::createUpdatedBigramEntryFrom(
+        const BigramEntry *const originalBigramEntry, const int newProbability,
+        const int timestamp) const {
+    // TODO: Consolidate historical info and probability.
+    if (mHeaderPolicy->hasHistoricalInfoOfWords()) {
+        const HistoricalInfo updatedHistoricalInfo =
+                ForgettingCurveUtils::createUpdatedHistoricalInfo(
+                        originalBigramEntry->getHistoricalInfo(), newProbability, timestamp);
+        return originalBigramEntry->updateHistoricalInfoAndGetEntry(&updatedHistoricalInfo);
+    } else {
+        return originalBigramEntry->updateProbabilityAndGetEntry(newProbability);
+    }
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.h b/native/jni/src/suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.h
new file mode 100644
index 0000000..5b6c5a1
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_BIGRAM_LIST_POLICY_H
+#define LATINIME_VER4_BIGRAM_LIST_POLICY_H
+
+#include "defines.h"
+#include "suggest/core/policy/dictionary_bigrams_structure_policy.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/bigram_entry.h"
+
+namespace latinime {
+
+class BigramDictContent;
+class HeaderPolicy;
+class TerminalPositionLookupTable;
+
+class Ver4BigramListPolicy : public DictionaryBigramsStructurePolicy {
+ public:
+    Ver4BigramListPolicy(BigramDictContent *const bigramDictContent,
+            const TerminalPositionLookupTable *const terminalPositionLookupTable,
+            const HeaderPolicy *const headerPolicy)
+            : mBigramDictContent(bigramDictContent),
+              mTerminalPositionLookupTable(terminalPositionLookupTable),
+              mHeaderPolicy(headerPolicy) {}
+
+    void getNextBigram(int *const outBigramPos, int *const outProbability,
+            bool *const outHasNext, int *const bigramEntryPos) const;
+
+    void skipAllBigrams(int *const pos) const {
+        // Do nothing because we don't need to skip bigram lists in ver4 dictionaries.
+    }
+
+    bool addNewEntry(const int terminalId, const int newTargetTerminalId, const int newProbability,
+            const int timestamp, bool *const outAddedNewEntry);
+
+    bool removeEntry(const int terminalId, const int targetTerminalId);
+
+    bool updateAllBigramEntriesAndDeleteUselessEntries(const int terminalId,
+            int *const outBigramCount);
+
+    int getBigramEntryConut(const int terminalId);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(Ver4BigramListPolicy);
+
+    int getEntryPosToUpdate(const int targetTerminalIdToFind, const int bigramListPos) const;
+
+    const BigramEntry createUpdatedBigramEntryFrom(const BigramEntry *const originalBigramEntry,
+            const int newProbability, const int timestamp) const;
+
+    BigramDictContent *const mBigramDictContent;
+    const TerminalPositionLookupTable *const mTerminalPositionLookupTable;
+    const HeaderPolicy *const mHeaderPolicy;
+};
+} // namespace latinime
+#endif /* LATINIME_VER4_BIGRAM_LIST_POLICY_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cpp b/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cpp
deleted file mode 100644
index ff80dd2..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cpp
+++ /dev/null
@@ -1,53 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.h"
-
-#include <stdint.h>
-
-#include "defines.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h"
-#include "suggest/policyimpl/dictionary/patricia_trie_policy.h"
-#include "suggest/policyimpl/dictionary/utils/format_utils.h"
-#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
-
-namespace latinime {
-
-/* static */ DictionaryStructureWithBufferPolicy *DictionaryStructureWithBufferPolicyFactory
-        ::newDictionaryStructureWithBufferPolicy(const char *const path, const int bufOffset,
-                const int size, const bool isUpdatable) {
-    // Allocated buffer in MmapedBuffer::openBuffer() will be freed in the destructor of
-    // impl classes of DictionaryStructureWithBufferPolicy.
-    const MmappedBuffer *const mmapedBuffer = MmappedBuffer::openBuffer(path, bufOffset, size,
-            isUpdatable);
-    if (!mmapedBuffer) {
-        return 0;
-    }
-    switch (FormatUtils::detectFormatVersion(mmapedBuffer->getBuffer(),
-            mmapedBuffer->getBufferSize())) {
-        case FormatUtils::VERSION_2:
-            return new PatriciaTriePolicy(mmapedBuffer);
-        case FormatUtils::VERSION_3:
-            return new DynamicPatriciaTriePolicy(mmapedBuffer);
-        default:
-            AKLOGE("DICT: dictionary format is unknown, bad magic number");
-            delete mmapedBuffer;
-            ASSERT(false);
-            return 0;
-    }
-}
-
-} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.cpp
deleted file mode 100644
index 5724c5d..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.cpp
+++ /dev/null
@@ -1,191 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.h"
-
-#include "suggest/core/policy/dictionary_header_structure_policy.h"
-#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
-
-namespace latinime {
-
-bool DynamicPatriciaTrieGcEventListeners
-        ::TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
-                ::onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                        const int *const nodeCodePoints) {
-    // PtNode is useless when the PtNode is not a terminal and doesn't have any not useless
-    // children.
-    bool isUselessPtNode = !node->isTerminal();
-    if (node->isTerminal() && mIsDecayingDict) {
-        const int newProbability =
-                ForgettingCurveUtils::getEncodedProbabilityToSave(node->getProbability(),
-                        mHeaderPolicy);
-        int writingPos = node->getProbabilityFieldPos();
-        // Update probability.
-        if (!DynamicPatriciaTrieWritingUtils::writeProbabilityAndAdvancePosition(
-                mBuffer, newProbability, &writingPos)) {
-            return false;
-        }
-        if (!ForgettingCurveUtils::isValidEncodedProbability(newProbability)) {
-            isUselessPtNode = true;
-        }
-    }
-    if (mChildrenValue > 0) {
-        isUselessPtNode = false;
-    } else if (node->isTerminal()) {
-        // Remove children as all children are useless.
-        int writingPos = node->getChildrenPosFieldPos();
-        if (!DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(
-                mBuffer, NOT_A_DICT_POS /* childrenPosition */, &writingPos)) {
-            return false;
-        }
-    }
-    if (isUselessPtNode) {
-        // Current PtNode is no longer needed. Mark it as deleted.
-        if (!mWritingHelper->markNodeAsDeleted(node)) {
-            return false;
-        }
-    } else {
-        mValueStack.back() += 1;
-        if (node->isTerminal()) {
-            mValidUnigramCount += 1;
-        }
-    }
-    return true;
-}
-
-bool DynamicPatriciaTrieGcEventListeners::TraversePolicyToUpdateBigramProbability
-        ::onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints) {
-    if (!node->isDeleted()) {
-        int pos = node->getBigramsPos();
-        if (pos != NOT_A_DICT_POS) {
-            int bigramEntryCount = 0;
-            if (!mBigramPolicy->updateAllBigramEntriesAndDeleteUselessEntries(&pos,
-                    &bigramEntryCount)) {
-                return false;
-            }
-            mValidBigramEntryCount += bigramEntryCount;
-        }
-    }
-    return true;
-}
-
-// Writes dummy PtNode array size when the head of PtNode array is read.
-bool DynamicPatriciaTrieGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
-        ::onDescend(const int ptNodeArrayPos) {
-    mValidPtNodeCount = 0;
-    int writingPos = mBufferToWrite->getTailPosition();
-    mDictPositionRelocationMap->mPtNodeArrayPositionRelocationMap.insert(
-            DynamicPatriciaTrieWritingHelper::PtNodeArrayPositionRelocationMap::value_type(
-                    ptNodeArrayPos, writingPos));
-    // Writes dummy PtNode array size because arrays can have a forward link or needles PtNodes.
-    // This field will be updated later in onReadingPtNodeArrayTail() with actual PtNode count.
-    mPtNodeArraySizeFieldPos = writingPos;
-    return DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(
-            mBufferToWrite, 0 /* arraySize */, &writingPos);
-}
-
-// Write PtNode array terminal and actual PtNode array size.
-bool DynamicPatriciaTrieGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
-        ::onReadingPtNodeArrayTail() {
-    int writingPos = mBufferToWrite->getTailPosition();
-    // Write PtNode array terminal.
-    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(
-            mBufferToWrite, NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
-        return false;
-    }
-    // Write actual PtNode array size.
-    if (!DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(
-            mBufferToWrite, mValidPtNodeCount, &mPtNodeArraySizeFieldPos)) {
-        return false;
-    }
-    return true;
-}
-
-// Write valid PtNode to buffer and memorize mapping from the old position to the new position.
-bool DynamicPatriciaTrieGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
-        ::onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints) {
-    if (node->isDeleted()) {
-        // Current PtNode is not written in new buffer because it has been deleted.
-        mDictPositionRelocationMap->mPtNodePositionRelocationMap.insert(
-                DynamicPatriciaTrieWritingHelper::PtNodePositionRelocationMap::value_type(
-                        node->getHeadPos(), NOT_A_DICT_POS));
-        return true;
-    }
-    int writingPos = mBufferToWrite->getTailPosition();
-    mDictPositionRelocationMap->mPtNodePositionRelocationMap.insert(
-            DynamicPatriciaTrieWritingHelper::PtNodePositionRelocationMap::value_type(
-                    node->getHeadPos(), writingPos));
-    mValidPtNodeCount++;
-    // Writes current PtNode.
-    return mWritingHelper->writePtNodeToBufferByCopyingPtNodeInfo(mBufferToWrite, node,
-            node->getParentPos(), nodeCodePoints, node->getCodePointCount(),
-            node->getProbability(), &writingPos);
-}
-
-bool DynamicPatriciaTrieGcEventListeners::TraversePolicyToUpdateAllPositionFields
-        ::onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints) {
-    // Updates parent position.
-    int parentPos = node->getParentPos();
-    if (parentPos != NOT_A_DICT_POS) {
-        DynamicPatriciaTrieWritingHelper::PtNodePositionRelocationMap::const_iterator it =
-                mDictPositionRelocationMap->mPtNodePositionRelocationMap.find(parentPos);
-        if (it != mDictPositionRelocationMap->mPtNodePositionRelocationMap.end()) {
-            parentPos = it->second;
-        }
-    }
-    int writingPos = node->getHeadPos() + DynamicPatriciaTrieWritingUtils::NODE_FLAG_FIELD_SIZE;
-    // Write updated parent offset.
-    if (!DynamicPatriciaTrieWritingUtils::writeParentPosOffsetAndAdvancePosition(mBufferToWrite,
-            parentPos, node->getHeadPos(), &writingPos)) {
-        return false;
-    }
-
-    // Updates children position.
-    int childrenPos = node->getChildrenPos();
-    if (childrenPos != NOT_A_DICT_POS) {
-        DynamicPatriciaTrieWritingHelper::PtNodeArrayPositionRelocationMap::const_iterator it =
-                mDictPositionRelocationMap->mPtNodeArrayPositionRelocationMap.find(childrenPos);
-        if (it != mDictPositionRelocationMap->mPtNodeArrayPositionRelocationMap.end()) {
-            childrenPos = it->second;
-        }
-    }
-    writingPos = node->getChildrenPosFieldPos();
-    if (!DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(mBufferToWrite,
-            childrenPos, &writingPos)) {
-        return false;
-    }
-
-    // Updates bigram target PtNode positions in the bigram list.
-    int bigramsPos = node->getBigramsPos();
-    if (bigramsPos != NOT_A_DICT_POS) {
-        int bigramEntryCount;
-        if (!mBigramPolicy->updateAllBigramTargetPtNodePositions(&bigramsPos,
-                &mDictPositionRelocationMap->mPtNodePositionRelocationMap, &bigramEntryCount)) {
-            return false;
-        }
-        mBigramCount += bigramEntryCount;
-    }
-    if (node->isTerminal()) {
-        mUnigramCount++;
-    }
-
-    return true;
-}
-
-} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.h
deleted file mode 100644
index 9755120..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.h
+++ /dev/null
@@ -1,197 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_GC_EVENT_LISTENERS_H
-#define LATINIME_DYNAMIC_PATRICIA_TRIE_GC_EVENT_LISTENERS_H
-
-#include <vector>
-
-#include "defines.h"
-#include "suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h"
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-#include "utils/hash_map_compat.h"
-
-namespace latinime {
-
-class DictionaryHeaderStructurePolicy;
-
-class DynamicPatriciaTrieGcEventListeners {
- public:
-    // Updates all PtNodes that can be reached from the root. Checks if each PtNode is useless or
-    // not and marks useless PtNodes as deleted. Such deleted PtNodes will be discarded in the GC.
-    // TODO: Concatenate non-terminal PtNodes.
-    class TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
-        : public DynamicPatriciaTrieReadingHelper::TraversingEventListener {
-     public:
-        TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted(
-                const DictionaryHeaderStructurePolicy *const headerPolicy,
-                DynamicPatriciaTrieWritingHelper *const writingHelper,
-                BufferWithExtendableBuffer *const buffer, const bool isDecayingDict)
-                : mHeaderPolicy(headerPolicy), mWritingHelper(writingHelper), mBuffer(buffer),
-                  mIsDecayingDict(isDecayingDict), mValueStack(), mChildrenValue(0),
-                  mValidUnigramCount(0) {}
-
-        ~TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted() {};
-
-        bool onAscend() {
-            if (mValueStack.empty()) {
-                return false;
-            }
-            mChildrenValue = mValueStack.back();
-            mValueStack.pop_back();
-            return true;
-        }
-
-        bool onDescend(const int ptNodeArrayPos) {
-            mValueStack.push_back(0);
-            mChildrenValue = 0;
-            return true;
-        }
-
-        bool onReadingPtNodeArrayTail() { return true; }
-
-        bool onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints);
-
-        int getValidUnigramCount() const {
-            return mValidUnigramCount;
-        }
-
-     private:
-        DISALLOW_IMPLICIT_CONSTRUCTORS(
-                TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted);
-
-        const DictionaryHeaderStructurePolicy *const mHeaderPolicy;
-        DynamicPatriciaTrieWritingHelper *const mWritingHelper;
-        BufferWithExtendableBuffer *const mBuffer;
-        const bool mIsDecayingDict;
-        std::vector<int> mValueStack;
-        int mChildrenValue;
-        int mValidUnigramCount;
-    };
-
-    // Updates all bigram entries that are held by valid PtNodes. This removes useless bigram
-    // entries.
-    class TraversePolicyToUpdateBigramProbability
-            : public DynamicPatriciaTrieReadingHelper::TraversingEventListener {
-     public:
-        TraversePolicyToUpdateBigramProbability(
-                DynamicBigramListPolicy *const bigramPolicy)
-                : mBigramPolicy(bigramPolicy), mValidBigramEntryCount(0) {}
-
-        bool onAscend() { return true; }
-
-        bool onDescend(const int ptNodeArrayPos) { return true; }
-
-        bool onReadingPtNodeArrayTail() { return true; }
-
-        bool onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints);
-
-        int getValidBigramEntryCount() const {
-            return mValidBigramEntryCount;
-        }
-
-     private:
-        DISALLOW_IMPLICIT_CONSTRUCTORS(TraversePolicyToUpdateBigramProbability);
-
-        DynamicBigramListPolicy *const mBigramPolicy;
-        int mValidBigramEntryCount;
-    };
-
-    class TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
-            : public DynamicPatriciaTrieReadingHelper::TraversingEventListener {
-     public:
-        TraversePolicyToPlaceAndWriteValidPtNodesToBuffer(
-                DynamicPatriciaTrieWritingHelper *const writingHelper,
-                BufferWithExtendableBuffer *const bufferToWrite,
-                DynamicPatriciaTrieWritingHelper::DictPositionRelocationMap *const
-                        dictPositionRelocationMap)
-                : mWritingHelper(writingHelper), mBufferToWrite(bufferToWrite),
-                  mDictPositionRelocationMap(dictPositionRelocationMap), mValidPtNodeCount(0),
-                  mPtNodeArraySizeFieldPos(NOT_A_DICT_POS) {};
-
-        bool onAscend() { return true; }
-
-        bool onDescend(const int ptNodeArrayPos);
-
-        bool onReadingPtNodeArrayTail();
-
-        bool onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints);
-
-     private:
-        DISALLOW_IMPLICIT_CONSTRUCTORS(TraversePolicyToPlaceAndWriteValidPtNodesToBuffer);
-
-        DynamicPatriciaTrieWritingHelper *const mWritingHelper;
-        BufferWithExtendableBuffer *const mBufferToWrite;
-        DynamicPatriciaTrieWritingHelper::DictPositionRelocationMap *const
-                mDictPositionRelocationMap;
-        int mValidPtNodeCount;
-        int mPtNodeArraySizeFieldPos;
-    };
-
-    class TraversePolicyToUpdateAllPositionFields
-            : public DynamicPatriciaTrieReadingHelper::TraversingEventListener {
-     public:
-        TraversePolicyToUpdateAllPositionFields(
-                DynamicPatriciaTrieWritingHelper *const writingHelper,
-                DynamicBigramListPolicy *const bigramPolicy,
-                BufferWithExtendableBuffer *const bufferToWrite,
-                const DynamicPatriciaTrieWritingHelper::DictPositionRelocationMap *const
-                        dictPositionRelocationMap)
-                : mWritingHelper(writingHelper), mBigramPolicy(bigramPolicy),
-                  mBufferToWrite(bufferToWrite),
-                  mDictPositionRelocationMap(dictPositionRelocationMap), mUnigramCount(0),
-                  mBigramCount(0) {};
-
-        bool onAscend() { return true; }
-
-        bool onDescend(const int ptNodeArrayPos) { return true; }
-
-        bool onReadingPtNodeArrayTail() { return true; }
-
-        bool onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints);
-
-        int getUnigramCount() const {
-            return mUnigramCount;
-        }
-
-        int getBigramCount() const {
-            return mBigramCount;
-        }
-
-     private:
-        DISALLOW_IMPLICIT_CONSTRUCTORS(TraversePolicyToUpdateAllPositionFields);
-
-        DynamicPatriciaTrieWritingHelper *const mWritingHelper;
-        DynamicBigramListPolicy *const mBigramPolicy;
-        BufferWithExtendableBuffer *const mBufferToWrite;
-        const DynamicPatriciaTrieWritingHelper::DictPositionRelocationMap *const
-                mDictPositionRelocationMap;
-        int mUnigramCount;
-        int mBigramCount;
-    };
-
- private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieGcEventListeners);
-};
-} // namespace latinime
-#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_GC_EVENT_LISTENERS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp
deleted file mode 100644
index 2fa3111..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.cpp
+++ /dev/null
@@ -1,124 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h"
-
-#include "suggest/core/policy/dictionary_bigrams_structure_policy.h"
-#include "suggest/core/policy/dictionary_shortcuts_structure_policy.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-
-namespace latinime {
-
-void DynamicPatriciaTrieNodeReader::fetchPtNodeInfoFromBufferAndProcessMovedPtNode(
-        const int ptNodePos, const int maxCodePointCount, int *const outCodePoints) {
-    if (ptNodePos < 0 || ptNodePos >= mBuffer->getTailPosition()) {
-        // Reading invalid position because of bug or broken dictionary.
-        AKLOGE("Fetching PtNode info from invalid dictionary position: %d, dictionary size: %d",
-                ptNodePos, mBuffer->getTailPosition());
-        ASSERT(false);
-        invalidatePtNodeInfo();
-        return;
-    }
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(ptNodePos);
-    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
-    int pos = ptNodePos;
-    mHeadPos = ptNodePos;
-    if (usesAdditionalBuffer) {
-        pos -= mBuffer->getOriginalBufferSize();
-    }
-    mFlags = PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(dictBuf, &pos);
-    const int parentPosOffset =
-            DynamicPatriciaTrieReadingUtils::getParentPtNodePosOffsetAndAdvancePosition(dictBuf,
-                    &pos);
-    mParentPos = DynamicPatriciaTrieReadingUtils::getParentPtNodePos(parentPosOffset, mHeadPos);
-    if (outCodePoints != 0) {
-        mCodePointCount = PatriciaTrieReadingUtils::getCharsAndAdvancePosition(
-                dictBuf, mFlags, maxCodePointCount, outCodePoints, &pos);
-    } else {
-        mCodePointCount = PatriciaTrieReadingUtils::skipCharacters(
-                dictBuf, mFlags, MAX_WORD_LENGTH, &pos);
-    }
-    if (isTerminal()) {
-        mProbabilityFieldPos = pos;
-        if (usesAdditionalBuffer) {
-            mProbabilityFieldPos += mBuffer->getOriginalBufferSize();
-        }
-        mProbability = PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(dictBuf, &pos);
-    } else {
-        mProbabilityFieldPos = NOT_A_DICT_POS;
-        mProbability = NOT_A_PROBABILITY;
-    }
-    mChildrenPosFieldPos = pos;
-    if (usesAdditionalBuffer) {
-        mChildrenPosFieldPos += mBuffer->getOriginalBufferSize();
-    }
-    mChildrenPos = DynamicPatriciaTrieReadingUtils::readChildrenPositionAndAdvancePosition(
-            dictBuf, &pos);
-    if (usesAdditionalBuffer && mChildrenPos != NOT_A_DICT_POS) {
-        mChildrenPos += mBuffer->getOriginalBufferSize();
-    }
-    if (mSiblingPos == NOT_A_DICT_POS) {
-        if (DynamicPatriciaTrieReadingUtils::isMoved(mFlags)) {
-            mBigramLinkedNodePos = mChildrenPos;
-        } else {
-            mBigramLinkedNodePos = NOT_A_DICT_POS;
-        }
-    }
-    if (usesAdditionalBuffer) {
-        pos += mBuffer->getOriginalBufferSize();
-    }
-    if (PatriciaTrieReadingUtils::hasShortcutTargets(mFlags)) {
-        mShortcutPos = pos;
-        mShortcutsPolicy->skipAllShortcuts(&pos);
-    } else {
-        mShortcutPos = NOT_A_DICT_POS;
-    }
-    if (PatriciaTrieReadingUtils::hasBigrams(mFlags)) {
-        mBigramPos = pos;
-        mBigramsPolicy->skipAllBigrams(&pos);
-    } else {
-        mBigramPos = NOT_A_DICT_POS;
-    }
-    // Update siblingPos if needed.
-    if (mSiblingPos == NOT_A_DICT_POS) {
-        // Sibling position is the tail position of current node.
-        mSiblingPos = pos;
-    }
-    // Read destination node if the read node is a moved node.
-    if (DynamicPatriciaTrieReadingUtils::isMoved(mFlags)) {
-        // The destination position is stored at the same place as the parent position.
-        fetchPtNodeInfoFromBufferAndProcessMovedPtNode(mParentPos, maxCodePointCount,
-                outCodePoints);
-    }
-}
-
-void DynamicPatriciaTrieNodeReader::invalidatePtNodeInfo() {
-    mHeadPos = NOT_A_DICT_POS;
-    mFlags = 0;
-    mParentPos = NOT_A_DICT_POS;
-    mCodePointCount = 0;
-    mProbabilityFieldPos = NOT_A_DICT_POS;
-    mProbability = NOT_A_PROBABILITY;
-    mChildrenPosFieldPos = NOT_A_DICT_POS;
-    mChildrenPos = NOT_A_DICT_POS;
-    mBigramLinkedNodePos = NOT_A_DICT_POS;
-    mShortcutPos = NOT_A_DICT_POS;
-    mBigramPos = NOT_A_DICT_POS;
-    mSiblingPos = NOT_A_DICT_POS;
-}
-
-}
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h
deleted file mode 100644
index 3b36d42..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h
+++ /dev/null
@@ -1,163 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_NODE_READER_H
-#define LATINIME_DYNAMIC_PATRICIA_TRIE_NODE_READER_H
-
-#include <stdint.h>
-
-#include "defines.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/patricia_trie_reading_utils.h"
-
-namespace latinime {
-
-class BufferWithExtendableBuffer;
-class DictionaryBigramsStructurePolicy;
-class DictionaryShortcutsStructurePolicy;
-
-/*
- * This class is used for helping to read nodes of dynamic patricia trie. This class handles moved
- * node and reads node attributes.
- */
-class DynamicPatriciaTrieNodeReader {
- public:
-    DynamicPatriciaTrieNodeReader(const BufferWithExtendableBuffer *const buffer,
-            const DictionaryBigramsStructurePolicy *const bigramsPolicy,
-            const DictionaryShortcutsStructurePolicy *const shortcutsPolicy)
-            : mBuffer(buffer), mBigramsPolicy(bigramsPolicy),
-              mShortcutsPolicy(shortcutsPolicy), mHeadPos(NOT_A_DICT_POS), mFlags(0),
-              mParentPos(NOT_A_DICT_POS), mCodePointCount(0), mProbabilityFieldPos(NOT_A_DICT_POS),
-              mProbability(NOT_A_PROBABILITY), mChildrenPosFieldPos(NOT_A_DICT_POS),
-              mChildrenPos(NOT_A_DICT_POS), mBigramLinkedNodePos(NOT_A_DICT_POS),
-              mShortcutPos(NOT_A_DICT_POS),  mBigramPos(NOT_A_DICT_POS),
-              mSiblingPos(NOT_A_DICT_POS) {}
-
-    ~DynamicPatriciaTrieNodeReader() {}
-
-    // Reads PtNode information from dictionary buffer and updates members with the information.
-    AK_FORCE_INLINE void fetchNodeInfoInBufferFromPtNodePos(const int ptNodePos) {
-        fetchNodeInfoInBufferFromPtNodePosAndGetNodeCodePoints(ptNodePos ,
-                0 /* maxCodePointCount */, 0 /* outCodePoints */);
-    }
-
-    AK_FORCE_INLINE void fetchNodeInfoInBufferFromPtNodePosAndGetNodeCodePoints(
-            const int ptNodePos, const int maxCodePointCount, int *const outCodePoints) {
-        mSiblingPos = NOT_A_DICT_POS;
-        mBigramLinkedNodePos = NOT_A_DICT_POS;
-        fetchPtNodeInfoFromBufferAndProcessMovedPtNode(ptNodePos, maxCodePointCount, outCodePoints);
-    }
-
-    // HeadPos is different from NodePos when the current PtNode is a moved PtNode.
-    AK_FORCE_INLINE int getHeadPos() const {
-        return mHeadPos;
-    }
-
-    // Flags
-    AK_FORCE_INLINE bool isDeleted() const {
-        return DynamicPatriciaTrieReadingUtils::isDeleted(mFlags);
-    }
-
-    AK_FORCE_INLINE bool hasChildren() const {
-        return mChildrenPos != NOT_A_DICT_POS;
-    }
-
-    AK_FORCE_INLINE bool isTerminal() const {
-        return PatriciaTrieReadingUtils::isTerminal(mFlags);
-    }
-
-    AK_FORCE_INLINE bool isBlacklisted() const {
-        return PatriciaTrieReadingUtils::isBlacklisted(mFlags);
-    }
-
-    AK_FORCE_INLINE bool isNotAWord() const {
-        return PatriciaTrieReadingUtils::isNotAWord(mFlags);
-    }
-
-    // Parent node position
-    AK_FORCE_INLINE int getParentPos() const {
-        return mParentPos;
-    }
-
-    // Number of code points
-    AK_FORCE_INLINE uint8_t getCodePointCount() const {
-        return mCodePointCount;
-    }
-
-    // Probability
-    AK_FORCE_INLINE int getProbabilityFieldPos() const {
-        return mProbabilityFieldPos;
-    }
-
-    AK_FORCE_INLINE int getProbability() const {
-        return mProbability;
-    }
-
-    // Children PtNode array position
-    AK_FORCE_INLINE int getChildrenPosFieldPos() const {
-        return mChildrenPosFieldPos;
-    }
-
-    AK_FORCE_INLINE int getChildrenPos() const {
-        return mChildrenPos;
-    }
-
-    // Bigram linked node position.
-    AK_FORCE_INLINE int getBigramLinkedNodePos() const {
-        return mBigramLinkedNodePos;
-    }
-
-    // Shortcutlist position
-    AK_FORCE_INLINE int getShortcutPos() const {
-        return mShortcutPos;
-    }
-
-    // Bigrams position
-    AK_FORCE_INLINE int getBigramsPos() const {
-        return mBigramPos;
-    }
-
-    // Sibling node position
-    AK_FORCE_INLINE int getSiblingNodePos() const {
-        return mSiblingPos;
-    }
-
- private:
-    DISALLOW_COPY_AND_ASSIGN(DynamicPatriciaTrieNodeReader);
-
-    const BufferWithExtendableBuffer *const mBuffer;
-    const DictionaryBigramsStructurePolicy *const mBigramsPolicy;
-    const DictionaryShortcutsStructurePolicy *const mShortcutsPolicy;
-    int mHeadPos;
-    DynamicPatriciaTrieReadingUtils::NodeFlags mFlags;
-    int mParentPos;
-    uint8_t mCodePointCount;
-    int mProbabilityFieldPos;
-    int mProbability;
-    int mChildrenPosFieldPos;
-    int mChildrenPos;
-    int mBigramLinkedNodePos;
-    int mShortcutPos;
-    int mBigramPos;
-    int mSiblingPos;
-
-    void fetchPtNodeInfoFromBufferAndProcessMovedPtNode(const int ptNodePos,
-            const int maxCodePointCount, int *const outCodePoints);
-
-    void invalidatePtNodeInfo();
-};
-} // namespace latinime
-#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_NODE_READER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.cpp
deleted file mode 100644
index 495b146..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.cpp
+++ /dev/null
@@ -1,380 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h"
-
-#include <cstdio>
-#include <cstring>
-#include <ctime>
-
-#include "defines.h"
-#include "suggest/core/dicnode/dic_node.h"
-#include "suggest/core/dicnode/dic_node_vector.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h"
-#include "suggest/policyimpl/dictionary/patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
-#include "suggest/policyimpl/dictionary/utils/probability_utils.h"
-
-namespace latinime {
-
-// Note that these are corresponding definitions in Java side in BinaryDictionaryTests and
-// BinaryDictionaryDecayingTests.
-const char *const DynamicPatriciaTriePolicy::UNIGRAM_COUNT_QUERY = "UNIGRAM_COUNT";
-const char *const DynamicPatriciaTriePolicy::BIGRAM_COUNT_QUERY = "BIGRAM_COUNT";
-const char *const DynamicPatriciaTriePolicy::MAX_UNIGRAM_COUNT_QUERY = "MAX_UNIGRAM_COUNT";
-const char *const DynamicPatriciaTriePolicy::MAX_BIGRAM_COUNT_QUERY = "MAX_BIGRAM_COUNT";
-const char *const DynamicPatriciaTriePolicy::SET_NEEDS_TO_DECAY_FOR_TESTING_QUERY =
-        "SET_NEEDS_TO_DECAY_FOR_TESTING";
-const int DynamicPatriciaTriePolicy::MAX_DICT_EXTENDED_REGION_SIZE = 1024 * 1024;
-const int DynamicPatriciaTriePolicy::MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS =
-        DynamicPatriciaTrieWritingHelper::MAX_DICTIONARY_SIZE - 1024;
-
-void DynamicPatriciaTriePolicy::createAndGetAllChildNodes(const DicNode *const dicNode,
-        DicNodeVector *const childDicNodes) const {
-    if (!dicNode->hasChildren()) {
-        return;
-    }
-    DynamicPatriciaTrieReadingHelper readingHelper(&mBufferWithExtendableBuffer,
-            getBigramsStructurePolicy(), getShortcutsStructurePolicy());
-    readingHelper.initWithPtNodeArrayPos(dicNode->getChildrenPos());
-    const DynamicPatriciaTrieNodeReader *const nodeReader = readingHelper.getNodeReader();
-    while (!readingHelper.isEnd()) {
-        bool isTerminal = nodeReader->isTerminal() && !nodeReader->isDeleted();
-        if (isTerminal && mHeaderPolicy.isDecayingDict()) {
-            // A DecayingDict may have a terminal PtNode that has a terminal DicNode whose
-            // probability is NOT_A_PROBABILITY. In such case, we don't want to treat it as a
-            // valid terminal DicNode.
-            isTerminal = getProbability(nodeReader->getProbability(), NOT_A_PROBABILITY)
-                    != NOT_A_PROBABILITY;
-        }
-        childDicNodes->pushLeavingChild(dicNode, nodeReader->getHeadPos(),
-                nodeReader->getChildrenPos(), nodeReader->getProbability(), isTerminal,
-                nodeReader->hasChildren(), nodeReader->isBlacklisted() || nodeReader->isNotAWord(),
-                nodeReader->getCodePointCount(), readingHelper.getMergedNodeCodePoints());
-        readingHelper.readNextSiblingNode();
-    }
-}
-
-int DynamicPatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
-        const int ptNodePos, const int maxCodePointCount, int *const outCodePoints,
-        int *const outUnigramProbability) const {
-    // This method traverses parent nodes from the terminal by following parent pointers; thus,
-    // node code points are stored in the buffer in the reverse order.
-    int reverseCodePoints[maxCodePointCount];
-    DynamicPatriciaTrieReadingHelper readingHelper(&mBufferWithExtendableBuffer,
-            getBigramsStructurePolicy(), getShortcutsStructurePolicy());
-    // First, read the terminal node and get its probability.
-    readingHelper.initWithPtNodePos(ptNodePos);
-    if (!readingHelper.isValidTerminalNode()) {
-        // Node at the ptNodePos is not a valid terminal node.
-        *outUnigramProbability = NOT_A_PROBABILITY;
-        return 0;
-    }
-    // Store terminal node probability.
-    *outUnigramProbability = readingHelper.getNodeReader()->getProbability();
-    // Then, following parent node link to the dictionary root and fetch node code points.
-    while (!readingHelper.isEnd()) {
-        if (readingHelper.getTotalCodePointCount() > maxCodePointCount) {
-            // The ptNodePos is not a valid terminal node position in the dictionary.
-            *outUnigramProbability = NOT_A_PROBABILITY;
-            return 0;
-        }
-        // Store node code points to buffer in the reverse order.
-        readingHelper.fetchMergedNodeCodePointsInReverseOrder(
-                readingHelper.getPrevTotalCodePointCount(), reverseCodePoints);
-        // Follow parent node toward the root node.
-        readingHelper.readParentNode();
-    }
-    if (readingHelper.isError()) {
-        // The node position or the dictionary is invalid.
-        *outUnigramProbability = NOT_A_PROBABILITY;
-        return 0;
-    }
-    // Reverse the stored code points to output them.
-    const int codePointCount = readingHelper.getTotalCodePointCount();
-    for (int i = 0; i < codePointCount; ++i) {
-        outCodePoints[i] = reverseCodePoints[codePointCount - i - 1];
-    }
-    return codePointCount;
-}
-
-int DynamicPatriciaTriePolicy::getTerminalNodePositionOfWord(const int *const inWord,
-        const int length, const bool forceLowerCaseSearch) const {
-    int searchCodePoints[length];
-    for (int i = 0; i < length; ++i) {
-        searchCodePoints[i] = forceLowerCaseSearch ? CharUtils::toLowerCase(inWord[i]) : inWord[i];
-    }
-    DynamicPatriciaTrieReadingHelper readingHelper(&mBufferWithExtendableBuffer,
-            getBigramsStructurePolicy(), getShortcutsStructurePolicy());
-    readingHelper.initWithPtNodeArrayPos(getRootPosition());
-    const DynamicPatriciaTrieNodeReader *const nodeReader = readingHelper.getNodeReader();
-    while (!readingHelper.isEnd()) {
-        const int matchedCodePointCount = readingHelper.getPrevTotalCodePointCount();
-        if (readingHelper.getTotalCodePointCount() > length
-                || !readingHelper.isMatchedCodePoint(0 /* index */,
-                        searchCodePoints[matchedCodePointCount])) {
-            // Current node has too many code points or its first code point is different from
-            // target code point. Skip this node and read the next sibling node.
-            readingHelper.readNextSiblingNode();
-            continue;
-        }
-        // Check following merged node code points.
-        const int nodeCodePointCount = nodeReader->getCodePointCount();
-        for (int j = 1; j < nodeCodePointCount; ++j) {
-            if (!readingHelper.isMatchedCodePoint(
-                    j, searchCodePoints[matchedCodePointCount + j])) {
-                // Different code point is found. The given word is not included in the dictionary.
-                return NOT_A_DICT_POS;
-            }
-        }
-        // All characters are matched.
-        if (length == readingHelper.getTotalCodePointCount()) {
-            // Terminal position is found.
-            return nodeReader->getHeadPos();
-        }
-        if (!nodeReader->hasChildren()) {
-            return NOT_A_DICT_POS;
-        }
-        // Advance to the children nodes.
-        readingHelper.readChildNode();
-    }
-    // If we already traversed the tree further than the word is long, there means
-    // there was no match (or we would have found it).
-    return NOT_A_DICT_POS;
-}
-
-int DynamicPatriciaTriePolicy::getProbability(const int unigramProbability,
-        const int bigramProbability) const {
-    if (mHeaderPolicy.isDecayingDict()) {
-        return ForgettingCurveUtils::getProbability(unigramProbability, bigramProbability);
-    } else {
-        if (unigramProbability == NOT_A_PROBABILITY) {
-            return NOT_A_PROBABILITY;
-        } else if (bigramProbability == NOT_A_PROBABILITY) {
-            return ProbabilityUtils::backoff(unigramProbability);
-        } else {
-            return ProbabilityUtils::computeProbabilityForBigram(unigramProbability,
-                    bigramProbability);
-        }
-    }
-}
-
-int DynamicPatriciaTriePolicy::getUnigramProbabilityOfPtNode(const int ptNodePos) const {
-    if (ptNodePos == NOT_A_DICT_POS) {
-        return NOT_A_PROBABILITY;
-    }
-    DynamicPatriciaTrieNodeReader nodeReader(&mBufferWithExtendableBuffer,
-            getBigramsStructurePolicy(), getShortcutsStructurePolicy());
-    nodeReader.fetchNodeInfoInBufferFromPtNodePos(ptNodePos);
-    if (nodeReader.isDeleted() || nodeReader.isBlacklisted() || nodeReader.isNotAWord()) {
-        return NOT_A_PROBABILITY;
-    }
-    return getProbability(nodeReader.getProbability(), NOT_A_PROBABILITY);
-}
-
-int DynamicPatriciaTriePolicy::getShortcutPositionOfPtNode(const int ptNodePos) const {
-    if (ptNodePos == NOT_A_DICT_POS) {
-        return NOT_A_DICT_POS;
-    }
-    DynamicPatriciaTrieNodeReader nodeReader(&mBufferWithExtendableBuffer,
-            getBigramsStructurePolicy(), getShortcutsStructurePolicy());
-    nodeReader.fetchNodeInfoInBufferFromPtNodePos(ptNodePos);
-    if (nodeReader.isDeleted()) {
-        return NOT_A_DICT_POS;
-    }
-    return nodeReader.getShortcutPos();
-}
-
-int DynamicPatriciaTriePolicy::getBigramsPositionOfPtNode(const int ptNodePos) const {
-    if (ptNodePos == NOT_A_DICT_POS) {
-        return NOT_A_DICT_POS;
-    }
-    DynamicPatriciaTrieNodeReader nodeReader(&mBufferWithExtendableBuffer,
-            getBigramsStructurePolicy(), getShortcutsStructurePolicy());
-    nodeReader.fetchNodeInfoInBufferFromPtNodePos(ptNodePos);
-    if (nodeReader.isDeleted()) {
-        return NOT_A_DICT_POS;
-    }
-    return nodeReader.getBigramsPos();
-}
-
-bool DynamicPatriciaTriePolicy::addUnigramWord(const int *const word, const int length,
-        const int probability) {
-    if (!mBuffer->isUpdatable()) {
-        AKLOGI("Warning: addUnigramWord() is called for non-updatable dictionary.");
-        return false;
-    }
-    if (mBufferWithExtendableBuffer.getTailPosition()
-            >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS) {
-        AKLOGE("The dictionary is too large to dynamically update.");
-        return false;
-    }
-    DynamicPatriciaTrieReadingHelper readingHelper(&mBufferWithExtendableBuffer,
-            getBigramsStructurePolicy(), getShortcutsStructurePolicy());
-    readingHelper.initWithPtNodeArrayPos(getRootPosition());
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer,
-            &mBigramListPolicy, &mShortcutListPolicy, mHeaderPolicy.isDecayingDict());
-    bool addedNewUnigram = false;
-    if (writingHelper.addUnigramWord(&readingHelper, word, length, probability,
-            &addedNewUnigram)) {
-        if (addedNewUnigram) {
-            mUnigramCount++;
-        }
-        return true;
-    } else {
-        return false;
-    }
-}
-
-bool DynamicPatriciaTriePolicy::addBigramWords(const int *const word0, const int length0,
-        const int *const word1, const int length1, const int probability) {
-    if (!mBuffer->isUpdatable()) {
-        AKLOGI("Warning: addBigramWords() is called for non-updatable dictionary.");
-        return false;
-    }
-    if (mBufferWithExtendableBuffer.getTailPosition()
-            >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS) {
-        AKLOGE("The dictionary is too large to dynamically update.");
-        return false;
-    }
-    const int word0Pos = getTerminalNodePositionOfWord(word0, length0,
-            false /* forceLowerCaseSearch */);
-    if (word0Pos == NOT_A_DICT_POS) {
-        return false;
-    }
-    const int word1Pos = getTerminalNodePositionOfWord(word1, length1,
-            false /* forceLowerCaseSearch */);
-    if (word1Pos == NOT_A_DICT_POS) {
-        return false;
-    }
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer,
-            &mBigramListPolicy, &mShortcutListPolicy, mHeaderPolicy.isDecayingDict());
-    bool addedNewBigram = false;
-    if (writingHelper.addBigramWords(word0Pos, word1Pos, probability, &addedNewBigram)) {
-        if (addedNewBigram) {
-            mBigramCount++;
-        }
-        return true;
-    } else {
-        return false;
-    }
-}
-
-bool DynamicPatriciaTriePolicy::removeBigramWords(const int *const word0, const int length0,
-        const int *const word1, const int length1) {
-    if (!mBuffer->isUpdatable()) {
-        AKLOGI("Warning: removeBigramWords() is called for non-updatable dictionary.");
-        return false;
-    }
-    if (mBufferWithExtendableBuffer.getTailPosition()
-            >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS) {
-        AKLOGE("The dictionary is too large to dynamically update.");
-        return false;
-    }
-    const int word0Pos = getTerminalNodePositionOfWord(word0, length0,
-            false /* forceLowerCaseSearch */);
-    if (word0Pos == NOT_A_DICT_POS) {
-        return false;
-    }
-    const int word1Pos = getTerminalNodePositionOfWord(word1, length1,
-            false /* forceLowerCaseSearch */);
-    if (word1Pos == NOT_A_DICT_POS) {
-        return false;
-    }
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer,
-            &mBigramListPolicy, &mShortcutListPolicy, mHeaderPolicy.isDecayingDict());
-    if (writingHelper.removeBigramWords(word0Pos, word1Pos)) {
-        mBigramCount--;
-        return true;
-    } else {
-        return false;
-    }
-}
-
-void DynamicPatriciaTriePolicy::flush(const char *const filePath) {
-    if (!mBuffer->isUpdatable()) {
-        AKLOGI("Warning: flush() is called for non-updatable dictionary.");
-        return;
-    }
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer,
-            &mBigramListPolicy, &mShortcutListPolicy, false /* needsToDecay */);
-    writingHelper.writeToDictFile(filePath, &mHeaderPolicy, mUnigramCount, mBigramCount);
-}
-
-void DynamicPatriciaTriePolicy::flushWithGC(const char *const filePath) {
-    if (!mBuffer->isUpdatable()) {
-        AKLOGI("Warning: flushWithGC() is called for non-updatable dictionary.");
-        return;
-    }
-    const bool needsToDecay = mHeaderPolicy.isDecayingDict()
-            && (mNeedsToDecayForTesting || ForgettingCurveUtils::needsToDecay(
-                    false /* mindsBlockByDecay */, mUnigramCount, mBigramCount, &mHeaderPolicy));
-    DynamicBigramListPolicy bigramListPolicyForGC(&mHeaderPolicy, &mBufferWithExtendableBuffer,
-            &mShortcutListPolicy, needsToDecay);
-    DynamicPatriciaTrieWritingHelper writingHelper(&mBufferWithExtendableBuffer,
-            &bigramListPolicyForGC, &mShortcutListPolicy, needsToDecay);
-    writingHelper.writeToDictFileWithGC(getRootPosition(), filePath, &mHeaderPolicy);
-    mNeedsToDecayForTesting = false;
-}
-
-bool DynamicPatriciaTriePolicy::needsToRunGC(const bool mindsBlockByGC) const {
-    if (!mBuffer->isUpdatable()) {
-        AKLOGI("Warning: needsToRunGC() is called for non-updatable dictionary.");
-        return false;
-    }
-    if (mBufferWithExtendableBuffer.isNearSizeLimit()) {
-        // Additional buffer size is near the limit.
-        return true;
-    } else if (mHeaderPolicy.getExtendedRegionSize()
-            + mBufferWithExtendableBuffer.getUsedAdditionalBufferSize()
-                    > MAX_DICT_EXTENDED_REGION_SIZE) {
-        // Total extended region size exceeds the limit.
-        return true;
-    } else if (mBufferWithExtendableBuffer.getTailPosition()
-            >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS
-                    && mBufferWithExtendableBuffer.getUsedAdditionalBufferSize() > 0) {
-        // Needs to reduce dictionary size.
-        return true;
-    } else if (mHeaderPolicy.isDecayingDict()) {
-        return mNeedsToDecayForTesting || ForgettingCurveUtils::needsToDecay(
-                mindsBlockByGC, mUnigramCount, mBigramCount, &mHeaderPolicy);
-    }
-    return false;
-}
-
-void DynamicPatriciaTriePolicy::getProperty(const char *const query, char *const outResult,
-        const int maxResultLength) {
-    if (strncmp(query, UNIGRAM_COUNT_QUERY, maxResultLength) == 0) {
-        snprintf(outResult, maxResultLength, "%d", mUnigramCount);
-    } else if (strncmp(query, BIGRAM_COUNT_QUERY, maxResultLength) == 0) {
-        snprintf(outResult, maxResultLength, "%d", mBigramCount);
-    } else if (strncmp(query, MAX_UNIGRAM_COUNT_QUERY, maxResultLength) == 0) {
-        snprintf(outResult, maxResultLength, "%d",
-                mHeaderPolicy.isDecayingDict() ? ForgettingCurveUtils::MAX_UNIGRAM_COUNT :
-                        static_cast<int>(DynamicPatriciaTrieWritingHelper::MAX_DICTIONARY_SIZE));
-    } else if (strncmp(query, MAX_BIGRAM_COUNT_QUERY, maxResultLength) == 0) {
-        snprintf(outResult, maxResultLength, "%d",
-                mHeaderPolicy.isDecayingDict() ? ForgettingCurveUtils::MAX_BIGRAM_COUNT :
-                        static_cast<int>(DynamicPatriciaTrieWritingHelper::MAX_DICTIONARY_SIZE));
-    } else if (strncmp(query, SET_NEEDS_TO_DECAY_FOR_TESTING_QUERY, maxResultLength) == 0) {
-        mNeedsToDecayForTesting = true;
-    }
-}
-
-} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h
deleted file mode 100644
index be97ee1..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_POLICY_H
-#define LATINIME_DYNAMIC_PATRICIA_TRIE_POLICY_H
-
-#include "defines.h"
-#include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
-#include "suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h"
-#include "suggest/policyimpl/dictionary/header/header_policy.h"
-#include "suggest/policyimpl/dictionary/shortcut/dynamic_shortcut_list_policy.h"
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
-
-namespace latinime {
-
-class DicNode;
-class DicNodeVector;
-
-class DynamicPatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
- public:
-    DynamicPatriciaTriePolicy(const MmappedBuffer *const buffer)
-            : mBuffer(buffer), mHeaderPolicy(mBuffer->getBuffer(), buffer->getBufferSize()),
-              mBufferWithExtendableBuffer(mBuffer->getBuffer() + mHeaderPolicy.getSize(),
-                      mBuffer->getBufferSize() - mHeaderPolicy.getSize()),
-              mShortcutListPolicy(&mBufferWithExtendableBuffer),
-              mBigramListPolicy(&mHeaderPolicy, &mBufferWithExtendableBuffer, &mShortcutListPolicy,
-                      mHeaderPolicy.isDecayingDict()),
-              mUnigramCount(mHeaderPolicy.getUnigramCount()),
-              mBigramCount(mHeaderPolicy.getBigramCount()), mNeedsToDecayForTesting(false) {}
-
-    ~DynamicPatriciaTriePolicy() {
-        delete mBuffer;
-    }
-
-    AK_FORCE_INLINE int getRootPosition() const {
-        return 0;
-    }
-
-    void createAndGetAllChildNodes(const DicNode *const dicNode,
-            DicNodeVector *const childDicNodes) const;
-
-    int getCodePointsAndProbabilityAndReturnCodePointCount(
-            const int terminalPtNodePos, const int maxCodePointCount, int *const outCodePoints,
-            int *const outUnigramProbability) const;
-
-    int getTerminalNodePositionOfWord(const int *const inWord,
-            const int length, const bool forceLowerCaseSearch) const;
-
-    int getProbability(const int unigramProbability, const int bigramProbability) const;
-
-    int getUnigramProbabilityOfPtNode(const int ptNodePos) const;
-
-    int getShortcutPositionOfPtNode(const int ptNodePos) const;
-
-    int getBigramsPositionOfPtNode(const int ptNodePos) const;
-
-    const DictionaryHeaderStructurePolicy *getHeaderStructurePolicy() const {
-        return &mHeaderPolicy;
-    }
-
-    const DictionaryBigramsStructurePolicy *getBigramsStructurePolicy() const {
-        return &mBigramListPolicy;
-    }
-
-    const DictionaryShortcutsStructurePolicy *getShortcutsStructurePolicy() const {
-        return &mShortcutListPolicy;
-    }
-
-    bool addUnigramWord(const int *const word, const int length, const int probability);
-
-    bool addBigramWords(const int *const word0, const int length0, const int *const word1,
-            const int length1, const int probability);
-
-    bool removeBigramWords(const int *const word0, const int length0, const int *const word1,
-            const int length1);
-
-    void flush(const char *const filePath);
-
-    void flushWithGC(const char *const filePath);
-
-    bool needsToRunGC(const bool mindsBlockByGC) const;
-
-    void getProperty(const char *const query, char *const outResult,
-            const int maxResultLength);
-
- private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTriePolicy);
-
-    static const char *const UNIGRAM_COUNT_QUERY;
-    static const char *const BIGRAM_COUNT_QUERY;
-    static const char *const MAX_UNIGRAM_COUNT_QUERY;
-    static const char *const MAX_BIGRAM_COUNT_QUERY;
-    static const char *const SET_NEEDS_TO_DECAY_FOR_TESTING_QUERY;
-    static const int MAX_DICT_EXTENDED_REGION_SIZE;
-    static const int MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS;
-
-    const MmappedBuffer *const mBuffer;
-    const HeaderPolicy mHeaderPolicy;
-    BufferWithExtendableBuffer mBufferWithExtendableBuffer;
-    DynamicShortcutListPolicy mShortcutListPolicy;
-    DynamicBigramListPolicy mBigramListPolicy;
-    int mUnigramCount;
-    int mBigramCount;
-    int mNeedsToDecayForTesting;
-};
-} // namespace latinime
-#endif // LATINIME_DYNAMIC_PATRICIA_TRIE_POLICY_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.cpp
deleted file mode 100644
index f108c21..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.cpp
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h"
-
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-
-namespace latinime {
-
-// To avoid infinite loop caused by invalid or malicious forward links.
-const int DynamicPatriciaTrieReadingHelper::MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP = 100000;
-const int DynamicPatriciaTrieReadingHelper::MAX_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP = 100000;
-const size_t DynamicPatriciaTrieReadingHelper::MAX_READING_STATE_STACK_SIZE = MAX_WORD_LENGTH;
-
-// Visits all PtNodes in post-order depth first manner.
-// For example, visits c -> b -> y -> x -> a for the following dictionary:
-// a _ b _ c
-//   \ x _ y
-bool DynamicPatriciaTrieReadingHelper::traverseAllPtNodesInPostorderDepthFirstManner(
-        TraversingEventListener *const listener) {
-    bool alreadyVisitedChildren = false;
-    // Descend from the root to the root PtNode array.
-    if (!listener->onDescend(getPosOfLastPtNodeArrayHead())) {
-        return false;
-    }
-    while (!isEnd()) {
-        if (!alreadyVisitedChildren) {
-            if (mNodeReader.hasChildren()) {
-                // Move to the first child.
-                if (!listener->onDescend(mNodeReader.getChildrenPos())) {
-                    return false;
-                }
-                pushReadingStateToStack();
-                readChildNode();
-            } else {
-                alreadyVisitedChildren = true;
-            }
-        } else {
-            if (!listener->onVisitingPtNode(&mNodeReader, mMergedNodeCodePoints)) {
-                return false;
-            }
-            readNextSiblingNode();
-            if (isEnd()) {
-                // All PtNodes in current linked PtNode arrays have been visited.
-                // Return to the parent.
-                if (!listener->onReadingPtNodeArrayTail()) {
-                    return false;
-                }
-                if (mReadingStateStack.size() <= 0) {
-                    break;
-                }
-                if (!listener->onAscend()) {
-                    return false;
-                }
-                popReadingStateFromStack();
-                alreadyVisitedChildren = true;
-            } else {
-                // Process sibling PtNode.
-                alreadyVisitedChildren = false;
-            }
-        }
-    }
-    // Ascend from the root PtNode array to the root.
-    if (!listener->onAscend()) {
-        return false;
-    }
-    return !isError();
-}
-
-// Visits all PtNodes in PtNode array level pre-order depth first manner, which is the same order
-// that PtNodes are written in the dictionary buffer.
-// For example, visits a -> b -> x -> c -> y for the following dictionary:
-// a _ b _ c
-//   \ x _ y
-bool DynamicPatriciaTrieReadingHelper::traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
-        TraversingEventListener *const listener) {
-    bool alreadyVisitedAllPtNodesInArray = false;
-    bool alreadyVisitedChildren = false;
-    // Descend from the root to the root PtNode array.
-    if (!listener->onDescend(getPosOfLastPtNodeArrayHead())) {
-        return false;
-    }
-    if (isEnd()) {
-        // Empty dictionary. Needs to notify the listener of the tail of empty PtNode array.
-        if (!listener->onReadingPtNodeArrayTail()) {
-            return false;
-        }
-    }
-    pushReadingStateToStack();
-    while (!isEnd()) {
-        if (alreadyVisitedAllPtNodesInArray) {
-            if (alreadyVisitedChildren) {
-                // Move to next sibling PtNode's children.
-                readNextSiblingNode();
-                if (isEnd()) {
-                    // Return to the parent PTNode.
-                    if (!listener->onAscend()) {
-                        return false;
-                    }
-                    if (mReadingStateStack.size() <= 0) {
-                        break;
-                    }
-                    popReadingStateFromStack();
-                    alreadyVisitedChildren = true;
-                    alreadyVisitedAllPtNodesInArray = true;
-                } else {
-                    alreadyVisitedChildren = false;
-                }
-            } else {
-                if (mNodeReader.hasChildren()) {
-                    // Move to the first child.
-                    if (!listener->onDescend(mNodeReader.getChildrenPos())) {
-                        return false;
-                    }
-                    pushReadingStateToStack();
-                    readChildNode();
-                    // Push state to return the head of PtNode array.
-                    pushReadingStateToStack();
-                    alreadyVisitedAllPtNodesInArray = false;
-                    alreadyVisitedChildren = false;
-                } else {
-                    alreadyVisitedChildren = true;
-                }
-            }
-        } else {
-            if (!listener->onVisitingPtNode(&mNodeReader, mMergedNodeCodePoints)) {
-                return false;
-            }
-            readNextSiblingNode();
-            if (isEnd()) {
-                if (!listener->onReadingPtNodeArrayTail()) {
-                    return false;
-                }
-                // Return to the head of current PtNode array.
-                popReadingStateFromStack();
-                alreadyVisitedAllPtNodesInArray = true;
-            }
-        }
-    }
-    popReadingStateFromStack();
-    // Ascend from the root PtNode array to the root.
-    if (!listener->onAscend()) {
-        return false;
-    }
-    return !isError();
-}
-
-// Read node array size and process empty node arrays. Nodes and arrays are counted up in this
-// method to avoid an infinite loop.
-void DynamicPatriciaTrieReadingHelper::nextPtNodeArray() {
-    if (mReadingState.mPos < 0 || mReadingState.mPos >= mBuffer->getTailPosition()) {
-        // Reading invalid position because of a bug or a broken dictionary.
-        AKLOGE("Reading PtNode array info from invalid dictionary position: %d, dict size: %d",
-                mReadingState.mPos, mBuffer->getTailPosition());
-        ASSERT(false);
-        mIsError = true;
-        mReadingState.mPos = NOT_A_DICT_POS;
-        return;
-    }
-    mReadingState.mPosOfLastPtNodeArrayHead = mReadingState.mPos;
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(mReadingState.mPos);
-    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
-    if (usesAdditionalBuffer) {
-        mReadingState.mPos -= mBuffer->getOriginalBufferSize();
-    }
-    mReadingState.mNodeCount = PatriciaTrieReadingUtils::getPtNodeArraySizeAndAdvancePosition(
-            dictBuf, &mReadingState.mPos);
-    if (usesAdditionalBuffer) {
-        mReadingState.mPos += mBuffer->getOriginalBufferSize();
-    }
-    // Count up nodes and node arrays to avoid infinite loop.
-    mReadingState.mTotalNodeCount += mReadingState.mNodeCount;
-    mReadingState.mNodeArrayCount++;
-    if (mReadingState.mNodeCount < 0
-            || mReadingState.mTotalNodeCount > MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP
-            || mReadingState.mNodeArrayCount > MAX_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP) {
-        // Invalid dictionary.
-        AKLOGI("Invalid dictionary. nodeCount: %d, totalNodeCount: %d, MAX_CHILD_COUNT: %d"
-                "nodeArrayCount: %d, MAX_NODE_ARRAY_COUNT: %d",
-                mReadingState.mNodeCount, mReadingState.mTotalNodeCount,
-                MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP, mReadingState.mNodeArrayCount,
-                MAX_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP);
-        ASSERT(false);
-        mIsError = true;
-        mReadingState.mPos = NOT_A_DICT_POS;
-        return;
-    }
-    if (mReadingState.mNodeCount == 0) {
-        // Empty node array. Try following forward link.
-        followForwardLink();
-    }
-}
-
-// Follow the forward link and read the next node array if exists.
-void DynamicPatriciaTrieReadingHelper::followForwardLink() {
-    if (mReadingState.mPos < 0 || mReadingState.mPos >= mBuffer->getTailPosition()) {
-        // Reading invalid position because of bug or broken dictionary.
-        AKLOGE("Reading forward link from invalid dictionary position: %d, dict size: %d",
-                mReadingState.mPos, mBuffer->getTailPosition());
-        ASSERT(false);
-        mIsError = true;
-        mReadingState.mPos = NOT_A_DICT_POS;
-        return;
-    }
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(mReadingState.mPos);
-    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
-    if (usesAdditionalBuffer) {
-        mReadingState.mPos -= mBuffer->getOriginalBufferSize();
-    }
-    const int forwardLinkPosition =
-            DynamicPatriciaTrieReadingUtils::getForwardLinkPosition(dictBuf, mReadingState.mPos);
-    if (usesAdditionalBuffer) {
-        mReadingState.mPos += mBuffer->getOriginalBufferSize();
-    }
-    mReadingState.mPosOfLastForwardLinkField = mReadingState.mPos;
-    if (DynamicPatriciaTrieReadingUtils::isValidForwardLinkPosition(forwardLinkPosition)) {
-        // Follow the forward link.
-        mReadingState.mPos += forwardLinkPosition;
-        nextPtNodeArray();
-    } else {
-        // All node arrays have been read.
-        mReadingState.mPos = NOT_A_DICT_POS;
-    }
-}
-
-} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h
deleted file mode 100644
index a71c069..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h
+++ /dev/null
@@ -1,289 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_READING_HELPER_H
-#define LATINIME_DYNAMIC_PATRICIA_TRIE_READING_HELPER_H
-
-#include <cstddef>
-#include <vector>
-
-#include "defines.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/patricia_trie_reading_utils.h"
-
-namespace latinime {
-
-class BufferWithExtendableBuffer;
-class DictionaryBigramsStructurePolicy;
-class DictionaryShortcutsStructurePolicy;
-
-/*
- * This class is used for traversing dynamic patricia trie. This class supports iterating nodes and
- * dealing with additional buffer. This class counts nodes and node arrays to avoid infinite loop.
- */
-class DynamicPatriciaTrieReadingHelper {
- public:
-    class TraversingEventListener {
-     public:
-        virtual ~TraversingEventListener() {};
-
-        // Returns whether the event handling was succeeded or not.
-        virtual bool onAscend() = 0;
-
-        // Returns whether the event handling was succeeded or not.
-        virtual bool onDescend(const int ptNodeArrayPos) = 0;
-
-        // Returns whether the event handling was succeeded or not.
-        virtual bool onReadingPtNodeArrayTail() = 0;
-
-        // Returns whether the event handling was succeeded or not.
-        virtual bool onVisitingPtNode(const DynamicPatriciaTrieNodeReader *const node,
-                const int *const nodeCodePoints) = 0;
-
-     protected:
-        TraversingEventListener() {};
-
-     private:
-        DISALLOW_COPY_AND_ASSIGN(TraversingEventListener);
-    };
-
-    DynamicPatriciaTrieReadingHelper(const BufferWithExtendableBuffer *const buffer,
-            const DictionaryBigramsStructurePolicy *const bigramsPolicy,
-            const DictionaryShortcutsStructurePolicy *const shortcutsPolicy)
-            : mIsError(false), mReadingState(), mBuffer(buffer),
-              mNodeReader(mBuffer, bigramsPolicy, shortcutsPolicy), mReadingStateStack() {}
-
-    ~DynamicPatriciaTrieReadingHelper() {}
-
-    AK_FORCE_INLINE bool isError() const {
-        return mIsError;
-    }
-
-    AK_FORCE_INLINE bool isEnd() const {
-        return mReadingState.mPos == NOT_A_DICT_POS;
-    }
-
-    // Initialize reading state with the head position of a PtNode array.
-    AK_FORCE_INLINE void initWithPtNodeArrayPos(const int ptNodeArrayPos) {
-        if (ptNodeArrayPos == NOT_A_DICT_POS) {
-            mReadingState.mPos = NOT_A_DICT_POS;
-        } else {
-            mIsError = false;
-            mReadingState.mPos = ptNodeArrayPos;
-            mReadingState.mPrevTotalCodePointCount = 0;
-            mReadingState.mTotalNodeCount = 0;
-            mReadingState.mNodeArrayCount = 0;
-            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
-            mReadingStateStack.clear();
-            nextPtNodeArray();
-            if (!isEnd()) {
-                fetchPtNodeInfo();
-            }
-        }
-    }
-
-    // Initialize reading state with the head position of a node.
-    AK_FORCE_INLINE void initWithPtNodePos(const int ptNodePos) {
-        if (ptNodePos == NOT_A_DICT_POS) {
-            mReadingState.mPos = NOT_A_DICT_POS;
-        } else {
-            mIsError = false;
-            mReadingState.mPos = ptNodePos;
-            mReadingState.mNodeCount = 1;
-            mReadingState.mPrevTotalCodePointCount = 0;
-            mReadingState.mTotalNodeCount = 1;
-            mReadingState.mNodeArrayCount = 1;
-            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
-            mReadingState.mPosOfLastPtNodeArrayHead = NOT_A_DICT_POS;
-            mReadingStateStack.clear();
-            fetchPtNodeInfo();
-        }
-    }
-
-    AK_FORCE_INLINE const DynamicPatriciaTrieNodeReader* getNodeReader() const {
-        return &mNodeReader;
-    }
-
-    AK_FORCE_INLINE bool isValidTerminalNode() const {
-        return !isEnd() && !mNodeReader.isDeleted() && mNodeReader.isTerminal();
-    }
-
-    AK_FORCE_INLINE bool isMatchedCodePoint(const int index, const int codePoint) const {
-        return mMergedNodeCodePoints[index] == codePoint;
-    }
-
-    // Return code point count exclude the last read node's code points.
-    AK_FORCE_INLINE int getPrevTotalCodePointCount() const {
-        return mReadingState.mPrevTotalCodePointCount;
-    }
-
-    // Return code point count include the last read node's code points.
-    AK_FORCE_INLINE int getTotalCodePointCount() const {
-        return mReadingState.mPrevTotalCodePointCount + mNodeReader.getCodePointCount();
-    }
-
-    AK_FORCE_INLINE void fetchMergedNodeCodePointsInReverseOrder(
-            const int index, int *const outCodePoints) const {
-        const int nodeCodePointCount = mNodeReader.getCodePointCount();
-        for (int i =  0; i < nodeCodePointCount; ++i) {
-            outCodePoints[index + i] = mMergedNodeCodePoints[nodeCodePointCount - 1 - i];
-        }
-    }
-
-    AK_FORCE_INLINE const int *getMergedNodeCodePoints() const {
-        return mMergedNodeCodePoints;
-    }
-
-    AK_FORCE_INLINE void readNextSiblingNode() {
-        mReadingState.mNodeCount -= 1;
-        mReadingState.mPos = mNodeReader.getSiblingNodePos();
-        if (mReadingState.mNodeCount <= 0) {
-            // All nodes in the current node array have been read.
-            followForwardLink();
-            if (!isEnd()) {
-                fetchPtNodeInfo();
-            }
-        } else {
-            fetchPtNodeInfo();
-        }
-    }
-
-    // Read the first child node of the current node.
-    AK_FORCE_INLINE void readChildNode() {
-        if (mNodeReader.hasChildren()) {
-            mReadingState.mPrevTotalCodePointCount += mNodeReader.getCodePointCount();
-            mReadingState.mTotalNodeCount = 0;
-            mReadingState.mNodeArrayCount = 0;
-            mReadingState.mPos = mNodeReader.getChildrenPos();
-            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
-            // Read children node array.
-            nextPtNodeArray();
-            if (!isEnd()) {
-                fetchPtNodeInfo();
-            }
-        } else {
-            mReadingState.mPos = NOT_A_DICT_POS;
-        }
-    }
-
-    // Read the parent node of the current node.
-    AK_FORCE_INLINE void readParentNode() {
-        if (mNodeReader.getParentPos() != NOT_A_DICT_POS) {
-            mReadingState.mPrevTotalCodePointCount += mNodeReader.getCodePointCount();
-            mReadingState.mTotalNodeCount = 1;
-            mReadingState.mNodeArrayCount = 1;
-            mReadingState.mNodeCount = 1;
-            mReadingState.mPos = mNodeReader.getParentPos();
-            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
-            mReadingState.mPosOfLastPtNodeArrayHead = NOT_A_DICT_POS;
-            fetchPtNodeInfo();
-        } else {
-            mReadingState.mPos = NOT_A_DICT_POS;
-        }
-    }
-
-    AK_FORCE_INLINE int getPosOfLastForwardLinkField() const {
-        return mReadingState.mPosOfLastForwardLinkField;
-    }
-
-    AK_FORCE_INLINE int getPosOfLastPtNodeArrayHead() const {
-        return mReadingState.mPosOfLastPtNodeArrayHead;
-    }
-
-    AK_FORCE_INLINE void reloadCurrentPtNodeInfo() {
-        if (!isEnd()) {
-            fetchPtNodeInfo();
-        }
-    }
-
-    bool traverseAllPtNodesInPostorderDepthFirstManner(TraversingEventListener *const listener);
-
-    bool traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
-            TraversingEventListener *const listener);
-
- private:
-    DISALLOW_COPY_AND_ASSIGN(DynamicPatriciaTrieReadingHelper);
-
-    class ReadingState {
-     public:
-        // Note that copy constructor and assignment operator are used for this class to use
-        // std::vector.
-        ReadingState() : mPos(NOT_A_DICT_POS), mNodeCount(0), mPrevTotalCodePointCount(0),
-                mTotalNodeCount(0), mNodeArrayCount(0), mPosOfLastForwardLinkField(NOT_A_DICT_POS),
-                mPosOfLastPtNodeArrayHead(NOT_A_DICT_POS) {}
-
-        int mPos;
-        // Node count of a node array.
-        int mNodeCount;
-        int mPrevTotalCodePointCount;
-        int mTotalNodeCount;
-        int mNodeArrayCount;
-        int mPosOfLastForwardLinkField;
-        int mPosOfLastPtNodeArrayHead;
-    };
-
-    static const int MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP;
-    static const int MAX_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP;
-    static const size_t MAX_READING_STATE_STACK_SIZE;
-
-    // TODO: Introduce error code to track what caused the error.
-    bool mIsError;
-    ReadingState mReadingState;
-    const BufferWithExtendableBuffer *const mBuffer;
-    DynamicPatriciaTrieNodeReader mNodeReader;
-    int mMergedNodeCodePoints[MAX_WORD_LENGTH];
-    std::vector<ReadingState> mReadingStateStack;
-
-    void nextPtNodeArray();
-
-    void followForwardLink();
-
-    AK_FORCE_INLINE void fetchPtNodeInfo() {
-        mNodeReader.fetchNodeInfoInBufferFromPtNodePosAndGetNodeCodePoints(mReadingState.mPos,
-                MAX_WORD_LENGTH, mMergedNodeCodePoints);
-        if (mNodeReader.getCodePointCount() <= 0) {
-            // Empty node is not allowed.
-            mIsError = true;
-            mReadingState.mPos = NOT_A_DICT_POS;
-        }
-    }
-
-    AK_FORCE_INLINE void pushReadingStateToStack() {
-        if (mReadingStateStack.size() > MAX_READING_STATE_STACK_SIZE) {
-            AKLOGI("Reading state stack overflow. Max size: %zd", MAX_READING_STATE_STACK_SIZE);
-            ASSERT(false);
-            mIsError = true;
-            mReadingState.mPos = NOT_A_DICT_POS;
-        } else {
-            mReadingStateStack.push_back(mReadingState);
-        }
-    }
-
-    AK_FORCE_INLINE void popReadingStateFromStack() {
-        if (mReadingStateStack.empty()) {
-            mReadingState.mPos = NOT_A_DICT_POS;
-        } else {
-            mReadingState = mReadingStateStack.back();
-            mReadingStateStack.pop_back();
-            if (!isEnd()) {
-                fetchPtNodeInfo();
-            }
-        }
-    }
-};
-} // namespace latinime
-#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_READING_HELPER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
deleted file mode 100644
index 052558b..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
+++ /dev/null
@@ -1,558 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h"
-
-#include "suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_gc_event_listeners.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h"
-#include "suggest/policyimpl/dictionary/header/header_policy.h"
-#include "suggest/policyimpl/dictionary/patricia_trie_reading_utils.h"
-#include "suggest/policyimpl/dictionary/shortcut/dynamic_shortcut_list_policy.h"
-#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
-#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
-#include "utils/hash_map_compat.h"
-
-namespace latinime {
-
-const int DynamicPatriciaTrieWritingHelper::CHILDREN_POSITION_FIELD_SIZE = 3;
-// TODO: Make MAX_DICTIONARY_SIZE 8MB.
-const size_t DynamicPatriciaTrieWritingHelper::MAX_DICTIONARY_SIZE = 2 * 1024 * 1024;
-
-bool DynamicPatriciaTrieWritingHelper::addUnigramWord(
-        DynamicPatriciaTrieReadingHelper *const readingHelper,
-        const int *const wordCodePoints, const int codePointCount, const int probability,
-        bool *const outAddedNewUnigram) {
-    int parentPos = NOT_A_DICT_POS;
-    while (!readingHelper->isEnd()) {
-        const int matchedCodePointCount = readingHelper->getPrevTotalCodePointCount();
-        if (!readingHelper->isMatchedCodePoint(0 /* index */,
-                wordCodePoints[matchedCodePointCount])) {
-            // The first code point is different from target code point. Skip this node and read
-            // the next sibling node.
-            readingHelper->readNextSiblingNode();
-            continue;
-        }
-        // Check following merged node code points.
-        const DynamicPatriciaTrieNodeReader *const nodeReader = readingHelper->getNodeReader();
-        const int nodeCodePointCount = nodeReader->getCodePointCount();
-        for (int j = 1; j < nodeCodePointCount; ++j) {
-            const int nextIndex = matchedCodePointCount + j;
-            if (nextIndex >= codePointCount || !readingHelper->isMatchedCodePoint(j,
-                    wordCodePoints[matchedCodePointCount + j])) {
-                *outAddedNewUnigram = true;
-                return reallocatePtNodeAndAddNewPtNodes(nodeReader,
-                        readingHelper->getMergedNodeCodePoints(), j,
-                        getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */,
-                                probability),
-                        wordCodePoints + matchedCodePointCount,
-                        codePointCount - matchedCodePointCount);
-            }
-        }
-        // All characters are matched.
-        if (codePointCount == readingHelper->getTotalCodePointCount()) {
-            return setPtNodeProbability(nodeReader, probability,
-                    readingHelper->getMergedNodeCodePoints(), outAddedNewUnigram);
-        }
-        if (!nodeReader->hasChildren()) {
-            *outAddedNewUnigram = true;
-            return createChildrenPtNodeArrayAndAChildPtNode(nodeReader,
-                    getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability),
-                    wordCodePoints + readingHelper->getTotalCodePointCount(),
-                    codePointCount - readingHelper->getTotalCodePointCount());
-        }
-        // Advance to the children nodes.
-        parentPos = nodeReader->getHeadPos();
-        readingHelper->readChildNode();
-    }
-    if (readingHelper->isError()) {
-        // The dictionary is invalid.
-        return false;
-    }
-    int pos = readingHelper->getPosOfLastForwardLinkField();
-    *outAddedNewUnigram = true;
-    return createAndInsertNodeIntoPtNodeArray(parentPos,
-            wordCodePoints + readingHelper->getPrevTotalCodePointCount(),
-            codePointCount - readingHelper->getPrevTotalCodePointCount(),
-            getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability), &pos);
-}
-
-bool DynamicPatriciaTrieWritingHelper::addBigramWords(const int word0Pos, const int word1Pos,
-        const int probability, bool *const outAddedNewBigram) {
-    int mMergedNodeCodePoints[MAX_WORD_LENGTH];
-    DynamicPatriciaTrieNodeReader nodeReader(mBuffer, mBigramPolicy, mShortcutPolicy);
-    nodeReader.fetchNodeInfoInBufferFromPtNodePosAndGetNodeCodePoints(word0Pos, MAX_WORD_LENGTH,
-            mMergedNodeCodePoints);
-    // Move node to add bigram entry.
-    const int newNodePos = mBuffer->getTailPosition();
-    if (!markNodeAsMovedAndSetPosition(&nodeReader, newNodePos, newNodePos)) {
-        return false;
-    }
-    int writingPos = newNodePos;
-    // Write a new PtNode using original PtNode's info to the tail of the dictionary in mBuffer.
-    if (!writePtNodeToBufferByCopyingPtNodeInfo(mBuffer, &nodeReader, nodeReader.getParentPos(),
-            mMergedNodeCodePoints, nodeReader.getCodePointCount(), nodeReader.getProbability(),
-            &writingPos)) {
-        return false;
-    }
-    nodeReader.fetchNodeInfoInBufferFromPtNodePos(newNodePos);
-    if (nodeReader.getBigramsPos() != NOT_A_DICT_POS) {
-        // Insert a new bigram entry into the existing bigram list.
-        int bigramListPos = nodeReader.getBigramsPos();
-        return mBigramPolicy->addNewBigramEntryToBigramList(word1Pos, probability, &bigramListPos,
-                outAddedNewBigram);
-    } else {
-        // The PtNode doesn't have a bigram list.
-        *outAddedNewBigram = true;
-        // First, Write a bigram entry at the tail position of the PtNode.
-        if (!mBigramPolicy->writeNewBigramEntry(word1Pos, probability, &writingPos)) {
-            return false;
-        }
-        // Then, Mark as the PtNode having bigram list in the flags.
-        const PatriciaTrieReadingUtils::NodeFlags updatedFlags =
-                PatriciaTrieReadingUtils::createAndGetFlags(nodeReader.isBlacklisted(),
-                        nodeReader.isNotAWord(), nodeReader.getProbability() != NOT_A_PROBABILITY,
-                        nodeReader.getShortcutPos() != NOT_A_DICT_POS, true /* hasBigrams */,
-                        nodeReader.getCodePointCount() > 1, CHILDREN_POSITION_FIELD_SIZE);
-        writingPos = newNodePos;
-        // Write updated flags into the moved PtNode's flags field.
-        return DynamicPatriciaTrieWritingUtils::writeFlagsAndAdvancePosition(mBuffer, updatedFlags,
-                &writingPos);
-    }
-}
-
-// Remove a bigram relation from word0Pos to word1Pos.
-bool DynamicPatriciaTrieWritingHelper::removeBigramWords(const int word0Pos, const int word1Pos) {
-    DynamicPatriciaTrieNodeReader nodeReader(mBuffer, mBigramPolicy, mShortcutPolicy);
-    nodeReader.fetchNodeInfoInBufferFromPtNodePos(word0Pos);
-    if (nodeReader.getBigramsPos() == NOT_A_DICT_POS) {
-        return false;
-    }
-    return mBigramPolicy->removeBigram(nodeReader.getBigramsPos(), word1Pos);
-}
-
-void DynamicPatriciaTrieWritingHelper::writeToDictFile(const char *const fileName,
-        const HeaderPolicy *const headerPolicy, const int unigramCount, const int bigramCount) {
-    BufferWithExtendableBuffer headerBuffer(0 /* originalBuffer */, 0 /* originalBufferSize */);
-    const int extendedRegionSize = headerPolicy->getExtendedRegionSize() +
-            mBuffer->getUsedAdditionalBufferSize();
-    if (!headerPolicy->writeHeaderToBuffer(&headerBuffer, false /* updatesLastUpdatedTime */,
-            false /* updatesLastDecayedTime */, unigramCount, bigramCount, extendedRegionSize)) {
-        return;
-    }
-    DictFileWritingUtils::flushAllHeaderAndBodyToFile(fileName, &headerBuffer, mBuffer);
-}
-
-void DynamicPatriciaTrieWritingHelper::writeToDictFileWithGC(const int rootPtNodeArrayPos,
-        const char *const fileName, const HeaderPolicy *const headerPolicy) {
-    BufferWithExtendableBuffer newDictBuffer(0 /* originalBuffer */, 0 /* originalBufferSize */,
-            MAX_DICTIONARY_SIZE);
-    int unigramCount = 0;
-    int bigramCount = 0;
-    if (mNeedsToDecay) {
-        ForgettingCurveUtils::sTimeKeeper.setCurrentTime();
-    }
-    if (!runGC(rootPtNodeArrayPos, headerPolicy, &newDictBuffer, &unigramCount, &bigramCount)) {
-        return;
-    }
-    BufferWithExtendableBuffer headerBuffer(0 /* originalBuffer */, 0 /* originalBufferSize */);
-    if (!headerPolicy->writeHeaderToBuffer(&headerBuffer, true /* updatesLastUpdatedTime */,
-            mNeedsToDecay, unigramCount, bigramCount, 0 /* extendedRegionSize */)) {
-        return;
-    }
-    DictFileWritingUtils::flushAllHeaderAndBodyToFile(fileName, &headerBuffer, &newDictBuffer);
-}
-
-bool DynamicPatriciaTrieWritingHelper::markNodeAsDeleted(
-        const DynamicPatriciaTrieNodeReader *const nodeToUpdate) {
-    int pos = nodeToUpdate->getHeadPos();
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(pos);
-    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
-    if (usesAdditionalBuffer) {
-        pos -= mBuffer->getOriginalBufferSize();
-    }
-    // Read original flags
-    const PatriciaTrieReadingUtils::NodeFlags originalFlags =
-            PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(dictBuf, &pos);
-    const PatriciaTrieReadingUtils::NodeFlags updatedFlags =
-            DynamicPatriciaTrieReadingUtils::updateAndGetFlags(originalFlags, false /* isMoved */,
-                    true /* isDeleted */);
-    int writingPos = nodeToUpdate->getHeadPos();
-    // Update flags.
-    return DynamicPatriciaTrieWritingUtils::writeFlagsAndAdvancePosition(mBuffer, updatedFlags,
-            &writingPos);
-}
-
-bool DynamicPatriciaTrieWritingHelper::markNodeAsMovedAndSetPosition(
-        const DynamicPatriciaTrieNodeReader *const originalNode, const int movedPos,
-        const int bigramLinkedNodePos) {
-    int pos = originalNode->getHeadPos();
-    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(pos);
-    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
-    if (usesAdditionalBuffer) {
-        pos -= mBuffer->getOriginalBufferSize();
-    }
-    // Read original flags
-    const PatriciaTrieReadingUtils::NodeFlags originalFlags =
-            PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(dictBuf, &pos);
-    const PatriciaTrieReadingUtils::NodeFlags updatedFlags =
-            DynamicPatriciaTrieReadingUtils::updateAndGetFlags(originalFlags, true /* isMoved */,
-                    false /* isDeleted */);
-    int writingPos = originalNode->getHeadPos();
-    // Update flags.
-    if (!DynamicPatriciaTrieWritingUtils::writeFlagsAndAdvancePosition(mBuffer, updatedFlags,
-            &writingPos)) {
-        return false;
-    }
-    // Update moved position, which is stored in the parent offset field.
-    if (!DynamicPatriciaTrieWritingUtils::writeParentPosOffsetAndAdvancePosition(
-            mBuffer, movedPos, originalNode->getHeadPos(), &writingPos)) {
-        return false;
-    }
-    // Update bigram linked node position, which is stored in the children position field.
-    int childrenPosFieldPos = originalNode->getChildrenPosFieldPos();
-    if (!DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(
-            mBuffer, bigramLinkedNodePos, &childrenPosFieldPos)) {
-        return false;
-    }
-    if (originalNode->hasChildren()) {
-        // Update children's parent position.
-        DynamicPatriciaTrieReadingHelper readingHelper(mBuffer, mBigramPolicy, mShortcutPolicy);
-        const DynamicPatriciaTrieNodeReader *const nodeReader = readingHelper.getNodeReader();
-        readingHelper.initWithPtNodeArrayPos(originalNode->getChildrenPos());
-        while (!readingHelper.isEnd()) {
-            int parentOffsetFieldPos = nodeReader->getHeadPos()
-                    + DynamicPatriciaTrieWritingUtils::NODE_FLAG_FIELD_SIZE;
-            if (!DynamicPatriciaTrieWritingUtils::writeParentPosOffsetAndAdvancePosition(
-                    mBuffer, bigramLinkedNodePos, nodeReader->getHeadPos(),
-                    &parentOffsetFieldPos)) {
-                // Parent offset cannot be written because of a bug or a broken dictionary; thus,
-                // we give up to update dictionary.
-                return false;
-            }
-            readingHelper.readNextSiblingNode();
-        }
-    }
-    return true;
-}
-
-// Write new PtNode at writingPos.
-bool DynamicPatriciaTrieWritingHelper::writePtNodeWithFullInfoToBuffer(
-        BufferWithExtendableBuffer *const bufferToWrite, const bool isBlacklisted,
-        const bool isNotAWord, const int parentPos, const int *const codePoints,
-        const int codePointCount, const int probability, const int childrenPos,
-        const int originalBigramListPos, const int originalShortcutListPos,
-        int *const writingPos) {
-    const int nodePos = *writingPos;
-    // Write dummy flags. The Node flags are updated with appropriate flags at the last step of the
-    // PtNode writing.
-    if (!DynamicPatriciaTrieWritingUtils::writeFlagsAndAdvancePosition(bufferToWrite,
-            0 /* nodeFlags */, writingPos)) {
-        return false;
-    }
-    // Calculate a parent offset and write the offset.
-    if (!DynamicPatriciaTrieWritingUtils::writeParentPosOffsetAndAdvancePosition(bufferToWrite,
-            parentPos, nodePos, writingPos)) {
-        return false;
-    }
-    // Write code points
-    if (!DynamicPatriciaTrieWritingUtils::writeCodePointsAndAdvancePosition(bufferToWrite,
-            codePoints, codePointCount, writingPos)) {
-        return false;
-    }
-    // Write probability when the probability is a valid probability, which means this node is
-    // terminal.
-    if (probability != NOT_A_PROBABILITY) {
-        if (!DynamicPatriciaTrieWritingUtils::writeProbabilityAndAdvancePosition(bufferToWrite,
-                probability, writingPos)) {
-            return false;
-        }
-    }
-    // Write children position
-    if (!DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(bufferToWrite,
-            childrenPos, writingPos)) {
-        return false;
-    }
-    // Copy shortcut list when the originalShortcutListPos is valid dictionary position.
-    if (originalShortcutListPos != NOT_A_DICT_POS) {
-        int fromPos = originalShortcutListPos;
-        if (!mShortcutPolicy->copyAllShortcutsAndReturnIfSucceededOrNot(bufferToWrite, &fromPos,
-                writingPos)) {
-            return false;
-        }
-    }
-    // Copy bigram list when the originalBigramListPos is valid dictionary position.
-    int bigramCount = 0;
-    if (originalBigramListPos != NOT_A_DICT_POS) {
-        int fromPos = originalBigramListPos;
-        if (!mBigramPolicy->copyAllBigrams(bufferToWrite, &fromPos, writingPos, &bigramCount)) {
-            return false;
-        }
-    }
-    // Create node flags and write them.
-    PatriciaTrieReadingUtils::NodeFlags nodeFlags =
-            PatriciaTrieReadingUtils::createAndGetFlags(isBlacklisted, isNotAWord,
-                    probability != NOT_A_PROBABILITY /* isTerminal */,
-                    originalShortcutListPos != NOT_A_DICT_POS /* hasShortcutTargets */,
-                    bigramCount > 0 /* hasBigrams */, codePointCount > 1 /* hasMultipleChars */,
-                    CHILDREN_POSITION_FIELD_SIZE);
-    int flagsFieldPos = nodePos;
-    if (!DynamicPatriciaTrieWritingUtils::writeFlagsAndAdvancePosition(bufferToWrite, nodeFlags,
-            &flagsFieldPos)) {
-        return false;
-    }
-    return true;
-}
-
-bool DynamicPatriciaTrieWritingHelper::writePtNodeToBuffer(
-        BufferWithExtendableBuffer *const bufferToWrite, const int parentPos,
-        const int *const codePoints, const int codePointCount, const int probability,
-        int *const writingPos) {
-    return writePtNodeWithFullInfoToBuffer(bufferToWrite, false /* isBlacklisted */,
-            false /* isNotAWord */, parentPos, codePoints, codePointCount, probability,
-            NOT_A_DICT_POS /* childrenPos */, NOT_A_DICT_POS /* originalBigramsPos */,
-            NOT_A_DICT_POS /* originalShortcutPos */, writingPos);
-}
-
-bool DynamicPatriciaTrieWritingHelper::writePtNodeToBufferByCopyingPtNodeInfo(
-        BufferWithExtendableBuffer *const bufferToWrite,
-        const DynamicPatriciaTrieNodeReader *const originalNode, const int parentPos,
-        const int *const codePoints, const int codePointCount, const int probability,
-        int *const writingPos) {
-    return writePtNodeWithFullInfoToBuffer(bufferToWrite, originalNode->isBlacklisted(),
-            originalNode->isNotAWord(), parentPos, codePoints, codePointCount, probability,
-            originalNode->getChildrenPos(), originalNode->getBigramsPos(),
-            originalNode->getShortcutPos(), writingPos);
-}
-
-bool DynamicPatriciaTrieWritingHelper::createAndInsertNodeIntoPtNodeArray(const int parentPos,
-        const int *const nodeCodePoints, const int nodeCodePointCount, const int probability,
-        int *const forwardLinkFieldPos) {
-    const int newPtNodeArrayPos = mBuffer->getTailPosition();
-    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
-            newPtNodeArrayPos, forwardLinkFieldPos)) {
-        return false;
-    }
-    return createNewPtNodeArrayWithAChildPtNode(parentPos, nodeCodePoints, nodeCodePointCount,
-            probability);
-}
-
-bool DynamicPatriciaTrieWritingHelper::setPtNodeProbability(
-        const DynamicPatriciaTrieNodeReader *const originalPtNode, const int probability,
-        const int *const codePoints, bool *const outAddedNewUnigram) {
-    if (originalPtNode->isTerminal()) {
-        // Overwrites the probability.
-        *outAddedNewUnigram = false;
-        const int probabilityToWrite = getUpdatedProbability(originalPtNode->getProbability(),
-                probability);
-        int probabilityFieldPos = originalPtNode->getProbabilityFieldPos();
-        if (!DynamicPatriciaTrieWritingUtils::writeProbabilityAndAdvancePosition(mBuffer,
-                probabilityToWrite, &probabilityFieldPos)) {
-            return false;
-        }
-    } else {
-        // Make the node terminal and write the probability.
-        *outAddedNewUnigram = true;
-        int movedPos = mBuffer->getTailPosition();
-        if (!markNodeAsMovedAndSetPosition(originalPtNode, movedPos, movedPos)) {
-            return false;
-        }
-        if (!writePtNodeToBufferByCopyingPtNodeInfo(mBuffer, originalPtNode,
-                originalPtNode->getParentPos(), codePoints, originalPtNode->getCodePointCount(),
-                getUpdatedProbability(NOT_A_PROBABILITY /* originalProbability */, probability),
-                &movedPos)) {
-            return false;
-        }
-    }
-    return true;
-}
-
-bool DynamicPatriciaTrieWritingHelper::createChildrenPtNodeArrayAndAChildPtNode(
-        const DynamicPatriciaTrieNodeReader *const parentNode, const int probability,
-        const int *const codePoints, const int codePointCount) {
-    const int newPtNodeArrayPos = mBuffer->getTailPosition();
-    int childrenPosFieldPos = parentNode->getChildrenPosFieldPos();
-    if (!DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(mBuffer,
-            newPtNodeArrayPos, &childrenPosFieldPos)) {
-        return false;
-    }
-    return createNewPtNodeArrayWithAChildPtNode(parentNode->getHeadPos(), codePoints,
-            codePointCount, probability);
-}
-
-bool DynamicPatriciaTrieWritingHelper::createNewPtNodeArrayWithAChildPtNode(
-        const int parentPtNodePos, const int *const nodeCodePoints, const int nodeCodePointCount,
-        const int probability) {
-    int writingPos = mBuffer->getTailPosition();
-    if (!DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
-            1 /* arraySize */, &writingPos)) {
-        return false;
-    }
-    if (!writePtNodeToBuffer(mBuffer, parentPtNodePos, nodeCodePoints, nodeCodePointCount,
-            probability, &writingPos)) {
-        return false;
-    }
-    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
-            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
-        return false;
-    }
-    return true;
-}
-
-// Returns whether the dictionary updating was succeeded or not.
-bool DynamicPatriciaTrieWritingHelper::reallocatePtNodeAndAddNewPtNodes(
-        const DynamicPatriciaTrieNodeReader *const reallocatingPtNode,
-        const int *const reallocatingPtNodeCodePoints, const int overlappingCodePointCount,
-        const int probabilityOfNewPtNode, const int *const newNodeCodePoints,
-        const int newNodeCodePointCount) {
-    // When addsExtraChild is true, split the reallocating PtNode and add new child.
-    // Reallocating PtNode: abcde, newNode: abcxy.
-    // abc (1st, not terminal) __ de (2nd)
-    //                         \_ xy (extra child, terminal)
-    // Otherwise, this method makes 1st part terminal and write probabilityOfNewPtNode.
-    // Reallocating PtNode: abcde, newNode: abc.
-    // abc (1st, terminal) __ de (2nd)
-    const bool addsExtraChild = newNodeCodePointCount > overlappingCodePointCount;
-    const int firstPartOfReallocatedPtNodePos = mBuffer->getTailPosition();
-    int writingPos = firstPartOfReallocatedPtNodePos;
-    // Write the 1st part of the reallocating node. The children position will be updated later
-    // with actual children position.
-    const int newProbability = addsExtraChild ? NOT_A_PROBABILITY : probabilityOfNewPtNode;
-    if (!writePtNodeToBuffer(mBuffer, reallocatingPtNode->getParentPos(),
-            reallocatingPtNodeCodePoints, overlappingCodePointCount, newProbability,
-            &writingPos)) {
-        return false;
-    }
-    const int actualChildrenPos = writingPos;
-    // Create new children PtNode array.
-    const size_t newPtNodeCount = addsExtraChild ? 2 : 1;
-    if (!DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
-            newPtNodeCount, &writingPos)) {
-        return false;
-    }
-    // Write the 2nd part of the reallocating node.
-    const int secondPartOfReallocatedPtNodePos = writingPos;
-    if (!writePtNodeToBufferByCopyingPtNodeInfo(mBuffer, reallocatingPtNode,
-            firstPartOfReallocatedPtNodePos,
-            reallocatingPtNodeCodePoints + overlappingCodePointCount,
-            reallocatingPtNode->getCodePointCount() - overlappingCodePointCount,
-            reallocatingPtNode->getProbability(), &writingPos)) {
-        return false;
-    }
-    if (addsExtraChild) {
-        if (!writePtNodeToBuffer(mBuffer, firstPartOfReallocatedPtNodePos,
-                newNodeCodePoints + overlappingCodePointCount,
-                newNodeCodePointCount - overlappingCodePointCount, probabilityOfNewPtNode,
-                &writingPos)) {
-            return false;
-        }
-    }
-    if (!DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
-            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
-        return false;
-    }
-    // Update original reallocatingPtNode as moved.
-    if (!markNodeAsMovedAndSetPosition(reallocatingPtNode, firstPartOfReallocatedPtNodePos,
-            secondPartOfReallocatedPtNodePos)) {
-        return false;
-    }
-    // Load node info. Information of the 1st part will be fetched.
-    DynamicPatriciaTrieNodeReader nodeReader(mBuffer, mBigramPolicy, mShortcutPolicy);
-    nodeReader.fetchNodeInfoInBufferFromPtNodePos(firstPartOfReallocatedPtNodePos);
-    // Update children position.
-    int childrenPosFieldPos = nodeReader.getChildrenPosFieldPos();
-    if (!DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(mBuffer,
-            actualChildrenPos, &childrenPosFieldPos)) {
-        return false;
-    }
-    return true;
-}
-
-bool DynamicPatriciaTrieWritingHelper::runGC(const int rootPtNodeArrayPos,
-        const HeaderPolicy *const headerPolicy, BufferWithExtendableBuffer *const bufferToWrite,
-        int *const outUnigramCount, int *const outBigramCount) {
-    DynamicPatriciaTrieReadingHelper readingHelper(mBuffer, mBigramPolicy, mShortcutPolicy);
-    readingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
-    DynamicPatriciaTrieGcEventListeners
-            ::TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
-                    traversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted(
-                            headerPolicy, this, mBuffer, mNeedsToDecay);
-    if (!readingHelper.traverseAllPtNodesInPostorderDepthFirstManner(
-            &traversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted)) {
-        return false;
-    }
-    if (mNeedsToDecay && traversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
-            .getValidUnigramCount() > ForgettingCurveUtils::MAX_UNIGRAM_COUNT_AFTER_GC) {
-        // TODO: Remove more unigrams.
-    }
-
-    readingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
-    DynamicPatriciaTrieGcEventListeners::TraversePolicyToUpdateBigramProbability
-            traversePolicyToUpdateBigramProbability(mBigramPolicy);
-    if (!readingHelper.traverseAllPtNodesInPostorderDepthFirstManner(
-            &traversePolicyToUpdateBigramProbability)) {
-        return false;
-    }
-    if (mNeedsToDecay && traversePolicyToUpdateBigramProbability.getValidBigramEntryCount()
-            > ForgettingCurveUtils::MAX_BIGRAM_COUNT_AFTER_GC) {
-        // TODO: Remove more bigrams.
-    }
-
-    // Mapping from positions in mBuffer to positions in bufferToWrite.
-    DictPositionRelocationMap dictPositionRelocationMap;
-    readingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
-    DynamicPatriciaTrieGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
-            traversePolicyToPlaceAndWriteValidPtNodesToBuffer(this, bufferToWrite,
-                    &dictPositionRelocationMap);
-    if (!readingHelper.traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
-            &traversePolicyToPlaceAndWriteValidPtNodesToBuffer)) {
-        return false;
-    }
-
-    // Create policy instance for the GCed dictionary.
-    DynamicShortcutListPolicy newDictShortcutPolicy(bufferToWrite);
-    DynamicBigramListPolicy newDictBigramPolicy(headerPolicy, bufferToWrite, &newDictShortcutPolicy,
-            mNeedsToDecay);
-    // Create reading helper for the GCed dictionary.
-    DynamicPatriciaTrieReadingHelper newDictReadingHelper(bufferToWrite, &newDictBigramPolicy,
-            &newDictShortcutPolicy);
-    newDictReadingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
-    DynamicPatriciaTrieGcEventListeners::TraversePolicyToUpdateAllPositionFields
-            traversePolicyToUpdateAllPositionFields(this, &newDictBigramPolicy, bufferToWrite,
-                    &dictPositionRelocationMap);
-    if (!newDictReadingHelper.traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
-            &traversePolicyToUpdateAllPositionFields)) {
-        return false;
-    }
-    *outUnigramCount = traversePolicyToUpdateAllPositionFields.getUnigramCount();
-    *outBigramCount = traversePolicyToUpdateAllPositionFields.getBigramCount();
-    return true;
-}
-
-int DynamicPatriciaTrieWritingHelper::getUpdatedProbability(const int originalProbability,
-        const int newProbability) {
-    if (mNeedsToDecay) {
-        return ForgettingCurveUtils::getUpdatedEncodedProbability(originalProbability,
-                newProbability);
-    } else {
-        return newProbability;
-    }
-}
-
-} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h
deleted file mode 100644
index ca86647..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.h
+++ /dev/null
@@ -1,138 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_HELPER_H
-#define LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_HELPER_H
-
-#include <stdint.h>
-
-#include "defines.h"
-#include "utils/hash_map_compat.h"
-
-namespace latinime {
-
-class BufferWithExtendableBuffer;
-class DynamicBigramListPolicy;
-class DynamicPatriciaTrieNodeReader;
-class DynamicPatriciaTrieReadingHelper;
-class DynamicShortcutListPolicy;
-class HeaderPolicy;
-
-class DynamicPatriciaTrieWritingHelper {
- public:
-    typedef hash_map_compat<int, int> PtNodeArrayPositionRelocationMap;
-    typedef hash_map_compat<int, int> PtNodePositionRelocationMap;
-    struct DictPositionRelocationMap {
-     public:
-        DictPositionRelocationMap()
-                : mPtNodeArrayPositionRelocationMap(), mPtNodePositionRelocationMap() {}
-
-        PtNodeArrayPositionRelocationMap mPtNodeArrayPositionRelocationMap;
-        PtNodePositionRelocationMap mPtNodePositionRelocationMap;
-
-     private:
-        DISALLOW_COPY_AND_ASSIGN(DictPositionRelocationMap);
-    };
-
-    static const size_t MAX_DICTIONARY_SIZE;
-
-    DynamicPatriciaTrieWritingHelper(BufferWithExtendableBuffer *const buffer,
-            DynamicBigramListPolicy *const bigramPolicy,
-            DynamicShortcutListPolicy *const shortcutPolicy, const bool needsToDecay)
-            : mBuffer(buffer), mBigramPolicy(bigramPolicy), mShortcutPolicy(shortcutPolicy),
-              mNeedsToDecay(needsToDecay) {}
-
-    ~DynamicPatriciaTrieWritingHelper() {}
-
-    // Add a word to the dictionary. If the word already exists, update the probability.
-    bool addUnigramWord(DynamicPatriciaTrieReadingHelper *const readingHelper,
-            const int *const wordCodePoints, const int codePointCount, const int probability,
-            bool *const outAddedNewUnigram);
-
-    // Add a bigram relation from word0Pos to word1Pos.
-    bool addBigramWords(const int word0Pos, const int word1Pos, const int probability,
-            bool *const outAddedNewBigram);
-
-    // Remove a bigram relation from word0Pos to word1Pos.
-    bool removeBigramWords(const int word0Pos, const int word1Pos);
-
-    void writeToDictFile(const char *const fileName, const HeaderPolicy *const headerPolicy,
-            const int unigramCount, const int bigramCount);
-
-    void writeToDictFileWithGC(const int rootPtNodeArrayPos, const char *const fileName,
-            const HeaderPolicy *const headerPolicy);
-
-    // CAVEAT: This method must be called only from inner classes of
-    // DynamicPatriciaTrieGcEventListeners.
-    bool markNodeAsDeleted(const DynamicPatriciaTrieNodeReader *const nodeToUpdate);
-
-    // CAVEAT: This method must be called only from this class or inner classes of
-    // DynamicPatriciaTrieGcEventListeners.
-    bool writePtNodeToBufferByCopyingPtNodeInfo(BufferWithExtendableBuffer *const bufferToWrite,
-            const DynamicPatriciaTrieNodeReader *const originalNode, const int parentPos,
-            const int *const codePoints, const int codePointCount, const int probability,
-            int *const writingPos);
-
- private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieWritingHelper);
-
-    static const int CHILDREN_POSITION_FIELD_SIZE;
-
-    BufferWithExtendableBuffer *const mBuffer;
-    DynamicBigramListPolicy *const mBigramPolicy;
-    DynamicShortcutListPolicy *const mShortcutPolicy;
-    const bool mNeedsToDecay;
-
-    bool markNodeAsMovedAndSetPosition(const DynamicPatriciaTrieNodeReader *const nodeToUpdate,
-            const int movedPos, const int bigramLinkedNodePos);
-
-    bool writePtNodeWithFullInfoToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
-            const bool isBlacklisted, const bool isNotAWord,
-            const int parentPos,  const int *const codePoints, const int codePointCount,
-            const int probability, const int childrenPos, const int originalBigramListPos,
-            const int originalShortcutListPos, int *const writingPos);
-
-    bool writePtNodeToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
-            const int parentPos, const int *const codePoints, const int codePointCount,
-            const int probability, int *const writingPos);
-
-    bool createAndInsertNodeIntoPtNodeArray(const int parentPos, const int *const nodeCodePoints,
-            const int nodeCodePointCount, const int probability, int *const forwardLinkFieldPos);
-
-    bool setPtNodeProbability(const DynamicPatriciaTrieNodeReader *const originalNode,
-            const int probability, const int *const codePoints, bool *const outAddedNewUnigram);
-
-    bool createChildrenPtNodeArrayAndAChildPtNode(
-            const DynamicPatriciaTrieNodeReader *const parentNode, const int probability,
-            const int *const codePoints, const int codePointCount);
-
-    bool createNewPtNodeArrayWithAChildPtNode(const int parentPos, const int *const nodeCodePoints,
-            const int nodeCodePointCount, const int probability);
-
-    bool reallocatePtNodeAndAddNewPtNodes(
-            const DynamicPatriciaTrieNodeReader *const reallocatingPtNode,
-            const int *const reallocatingPtNodeCodePoints, const int overlappingCodePointCount,
-            const int probabilityOfNewPtNode, const int *const newNodeCodePoints,
-            const int newNodeCodePointCount);
-
-    bool runGC(const int rootPtNodeArrayPos, const HeaderPolicy *const headerPolicy,
-            BufferWithExtendableBuffer *const bufferToWrite, int *const outUnigramCount,
-            int *const outBigramCount);
-
-    int getUpdatedProbability(const int originalProbability, const int newProbability);
-};
-} // namespace latinime
-#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_HELPER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
index eb072fb..be7a3c2 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
@@ -20,6 +20,8 @@
 
 // Note that these are corresponding definitions in Java side in FormatSpec.FileHeader.
 const char *const HeaderPolicy::MULTIPLE_WORDS_DEMOTION_RATE_KEY = "MULTIPLE_WORDS_DEMOTION_RATE";
+const char *const HeaderPolicy::REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY =
+        "REQUIRES_GERMAN_UMLAUT_PROCESSING";
 // TODO: Change attribute string to "IS_DECAYING_DICT".
 const char *const HeaderPolicy::IS_DECAYING_DICT_KEY = "USES_FORGETTING_CURVE";
 const char *const HeaderPolicy::LAST_UPDATED_TIME_KEY = "date";
@@ -27,6 +29,9 @@
 const char *const HeaderPolicy::UNIGRAM_COUNT_KEY = "UNIGRAM_COUNT";
 const char *const HeaderPolicy::BIGRAM_COUNT_KEY = "BIGRAM_COUNT";
 const char *const HeaderPolicy::EXTENDED_REGION_SIZE_KEY = "EXTENDED_REGION_SIZE";
+// Historical info is information that is needed to support decaying such as timestamp, level and
+// count.
+const char *const HeaderPolicy::HAS_HISTORICAL_INFO_KEY = "HAS_HISTORICAL_INFO";
 const int HeaderPolicy::DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE = 100;
 const float HeaderPolicy::MULTIPLE_WORD_COST_MULTIPLIER_SCALE = 100.0f;
 
@@ -63,6 +68,11 @@
     return MULTIPLE_WORD_COST_MULTIPLIER_SCALE / static_cast<float>(demotionRate);
 }
 
+bool HeaderPolicy::readRequiresGermanUmlautProcessing() const {
+    return HeaderReadWriteUtils::readBoolAttributeValue(&mAttributeMap,
+            REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY, false);
+}
+
 bool HeaderPolicy::writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
         const bool updatesLastUpdatedTime, const bool updatesLastDecayedTime,
         const int unigramCount, const int bigramCount, const int extendedRegionSize) const {
@@ -89,12 +99,12 @@
     if (updatesLastUpdatedTime) {
         // Set current time as a last updated time.
         HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, LAST_UPDATED_TIME_KEY,
-                time(0));
+                TimeKeeper::peekCurrentTime());
     }
     if (updatesLastDecayedTime) {
         // Set current time as a last updated time.
         HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, LAST_DECAYED_TIME_KEY,
-                time(0));
+                TimeKeeper::peekCurrentTime());
     }
     if (!HeaderReadWriteUtils::writeHeaderAttributes(bufferToWrite, &attributeMapTowrite,
             &writingPos)) {
diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
index a9c7805..1208d2c 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
@@ -17,37 +17,40 @@
 #ifndef LATINIME_HEADER_POLICY_H
 #define LATINIME_HEADER_POLICY_H
 
-#include <ctime>
 #include <stdint.h>
 
 #include "defines.h"
 #include "suggest/core/policy/dictionary_header_structure_policy.h"
 #include "suggest/policyimpl/dictionary/header/header_read_write_utils.h"
 #include "suggest/policyimpl/dictionary/utils/format_utils.h"
+#include "utils/time_keeper.h"
 
 namespace latinime {
 
 class HeaderPolicy : public DictionaryHeaderStructurePolicy {
  public:
     // Reads information from existing dictionary buffer.
-    HeaderPolicy(const uint8_t *const dictBuf, const int dictSize)
-            : mDictFormatVersion(FormatUtils::detectFormatVersion(dictBuf, dictSize)),
+    HeaderPolicy(const uint8_t *const dictBuf, const FormatUtils::FORMAT_VERSION formatVersion)
+            : mDictFormatVersion(formatVersion),
               mDictionaryFlags(HeaderReadWriteUtils::getFlags(dictBuf)),
               mSize(HeaderReadWriteUtils::getHeaderSize(dictBuf)),
               mAttributeMap(createAttributeMapAndReadAllAttributes(dictBuf)),
               mMultiWordCostMultiplier(readMultipleWordCostMultiplier()),
+              mRequiresGermanUmlautProcessing(readRequiresGermanUmlautProcessing()),
               mIsDecayingDict(HeaderReadWriteUtils::readBoolAttributeValue(&mAttributeMap,
                       IS_DECAYING_DICT_KEY, false /* defaultValue */)),
               mLastUpdatedTime(HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
-                      LAST_UPDATED_TIME_KEY, time(0) /* defaultValue */)),
+                      LAST_UPDATED_TIME_KEY, TimeKeeper::peekCurrentTime() /* defaultValue */)),
               mLastDecayedTime(HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
-                      LAST_DECAYED_TIME_KEY, time(0) /* defaultValue */)),
+                      LAST_DECAYED_TIME_KEY, TimeKeeper::peekCurrentTime() /* defaultValue */)),
               mUnigramCount(HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
                       UNIGRAM_COUNT_KEY, 0 /* defaultValue */)),
               mBigramCount(HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
                       BIGRAM_COUNT_KEY, 0 /* defaultValue */)),
               mExtendedRegionSize(HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
-                      EXTENDED_REGION_SIZE_KEY, 0 /* defaultValue */)) {}
+                      EXTENDED_REGION_SIZE_KEY, 0 /* defaultValue */)),
+              mHasHistoricalInfoOfWords(HeaderReadWriteUtils::readBoolAttributeValue(
+                      &mAttributeMap, HAS_HISTORICAL_INFO_KEY, false /* defaultValue */)) {}
 
     // Constructs header information using an attribute map.
     HeaderPolicy(const FormatUtils::FORMAT_VERSION dictFormatVersion,
@@ -56,32 +59,57 @@
               mDictionaryFlags(HeaderReadWriteUtils::createAndGetDictionaryFlagsUsingAttributeMap(
                       attributeMap)), mSize(0), mAttributeMap(*attributeMap),
               mMultiWordCostMultiplier(readMultipleWordCostMultiplier()),
+              mRequiresGermanUmlautProcessing(readRequiresGermanUmlautProcessing()),
               mIsDecayingDict(HeaderReadWriteUtils::readBoolAttributeValue(&mAttributeMap,
                       IS_DECAYING_DICT_KEY, false /* defaultValue */)),
               mLastUpdatedTime(HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
-                      LAST_UPDATED_TIME_KEY, time(0) /* defaultValue */)),
+                      LAST_UPDATED_TIME_KEY, TimeKeeper::peekCurrentTime() /* defaultValue */)),
               mLastDecayedTime(HeaderReadWriteUtils::readIntAttributeValue(&mAttributeMap,
-                      LAST_UPDATED_TIME_KEY, time(0) /* defaultValue */)),
-              mUnigramCount(0), mBigramCount(0), mExtendedRegionSize(0) {}
+                      LAST_UPDATED_TIME_KEY, TimeKeeper::peekCurrentTime() /* defaultValue */)),
+              mUnigramCount(0), mBigramCount(0), mExtendedRegionSize(0),
+              mHasHistoricalInfoOfWords(HeaderReadWriteUtils::readBoolAttributeValue(
+                      &mAttributeMap, HAS_HISTORICAL_INFO_KEY, false /* defaultValue */)) {}
+
+    // Temporary dummy header.
+    HeaderPolicy()
+            : mDictFormatVersion(FormatUtils::UNKNOWN_VERSION), mDictionaryFlags(0), mSize(0),
+              mAttributeMap(), mMultiWordCostMultiplier(0.0f),
+              mRequiresGermanUmlautProcessing(false), mIsDecayingDict(false),
+              mLastUpdatedTime(0), mLastDecayedTime(0), mUnigramCount(0), mBigramCount(0),
+              mExtendedRegionSize(0), mHasHistoricalInfoOfWords(false) {}
 
     ~HeaderPolicy() {}
 
+    virtual int getFormatVersionNumber() const {
+        // Conceptually this converts the symbolic value we use in the code into the
+        // hardcoded of the bytes in the file. But we want the constants to be the
+        // same so we use them for both here.
+        switch (mDictFormatVersion) {
+            case FormatUtils::VERSION_2:
+                return FormatUtils::VERSION_2;
+            case FormatUtils::VERSION_4:
+                return FormatUtils::VERSION_4;
+            default:
+                return FormatUtils::UNKNOWN_VERSION;
+        }
+    }
+
+    AK_FORCE_INLINE bool isValid() const {
+        // Decaying dictionary must have historical information.
+        if (!mIsDecayingDict) {
+            return true;
+        }
+        if (mHasHistoricalInfoOfWords) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
     AK_FORCE_INLINE int getSize() const {
         return mSize;
     }
 
-    AK_FORCE_INLINE bool supportsDynamicUpdate() const {
-        return HeaderReadWriteUtils::supportsDynamicUpdate(mDictionaryFlags);
-    }
-
-    AK_FORCE_INLINE bool requiresGermanUmlautProcessing() const {
-        return HeaderReadWriteUtils::requiresGermanUmlautProcessing(mDictionaryFlags);
-    }
-
-    AK_FORCE_INLINE bool requiresFrenchLigatureProcessing() const {
-        return HeaderReadWriteUtils::requiresFrenchLigatureProcessing(mDictionaryFlags);
-    }
-
     AK_FORCE_INLINE float getMultiWordCostMultiplier() const {
         return mMultiWordCostMultiplier;
     }
@@ -90,6 +118,10 @@
         return mIsDecayingDict;
     }
 
+    AK_FORCE_INLINE bool requiresGermanUmlautProcessing() const {
+        return mRequiresGermanUmlautProcessing;
+    }
+
     AK_FORCE_INLINE int getLastUpdatedTime() const {
         return mLastUpdatedTime;
     }
@@ -110,6 +142,10 @@
         return mExtendedRegionSize;
     }
 
+    AK_FORCE_INLINE bool hasHistoricalInfoOfWords() const {
+        return mHasHistoricalInfoOfWords;
+    }
+
     void readHeaderValueOrQuestionMark(const char *const key,
             int *outValue, int outValueSize) const;
 
@@ -118,15 +154,17 @@
             const int unigramCount, const int bigramCount, const int extendedRegionSize) const;
 
  private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(HeaderPolicy);
+    DISALLOW_COPY_AND_ASSIGN(HeaderPolicy);
 
     static const char *const MULTIPLE_WORDS_DEMOTION_RATE_KEY;
+    static const char *const REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY;
     static const char *const IS_DECAYING_DICT_KEY;
     static const char *const LAST_UPDATED_TIME_KEY;
     static const char *const LAST_DECAYED_TIME_KEY;
     static const char *const UNIGRAM_COUNT_KEY;
     static const char *const BIGRAM_COUNT_KEY;
     static const char *const EXTENDED_REGION_SIZE_KEY;
+    static const char *const HAS_HISTORICAL_INFO_KEY;
     static const int DEFAULT_MULTIPLE_WORDS_DEMOTION_RATE;
     static const float MULTIPLE_WORD_COST_MULTIPLIER_SCALE;
 
@@ -135,14 +173,17 @@
     const int mSize;
     HeaderReadWriteUtils::AttributeMap mAttributeMap;
     const float mMultiWordCostMultiplier;
+    const bool mRequiresGermanUmlautProcessing;
     const bool mIsDecayingDict;
     const int mLastUpdatedTime;
     const int mLastDecayedTime;
     const int mUnigramCount;
     const int mBigramCount;
     const int mExtendedRegionSize;
+    const bool mHasHistoricalInfoOfWords;
 
     float readMultipleWordCostMultiplier() const;
+    bool readRequiresGermanUmlautProcessing() const;
 
     static HeaderReadWriteUtils::AttributeMap createAttributeMapAndReadAllAttributes(
             const uint8_t *const dictBuf);
diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp
index 5ded8f6..6b45986 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp
@@ -35,22 +35,6 @@
 const int HeaderReadWriteUtils::HEADER_SIZE_FIELD_SIZE = 4;
 
 const HeaderReadWriteUtils::DictionaryFlags HeaderReadWriteUtils::NO_FLAGS = 0;
-// Flags for special processing
-// Those *must* match the flags in makedict (FormatSpec#*_PROCESSING_FLAG) or
-// something very bad (like, the apocalypse) will happen. Please update both at the same time.
-const HeaderReadWriteUtils::DictionaryFlags
-        HeaderReadWriteUtils::GERMAN_UMLAUT_PROCESSING_FLAG = 0x1;
-const HeaderReadWriteUtils::DictionaryFlags
-        HeaderReadWriteUtils::SUPPORTS_DYNAMIC_UPDATE_FLAG = 0x2;
-const HeaderReadWriteUtils::DictionaryFlags
-        HeaderReadWriteUtils::FRENCH_LIGATURE_PROCESSING_FLAG = 0x4;
-
-// Note that these are corresponding definitions in Java side in FormatSpec.FileHeader.
-const char *const HeaderReadWriteUtils::SUPPORTS_DYNAMIC_UPDATE_KEY = "SUPPORTS_DYNAMIC_UPDATE";
-const char *const HeaderReadWriteUtils::REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY =
-        "REQUIRES_GERMAN_UMLAUT_PROCESSING";
-const char *const HeaderReadWriteUtils::REQUIRES_FRENCH_LIGATURE_PROCESSING_KEY =
-        "REQUIRES_FRENCH_LIGATURE_PROCESSING";
 
 /* static */ int HeaderReadWriteUtils::getHeaderSize(const uint8_t *const dictBuf) {
     // See the format of the header in the comment in
@@ -68,17 +52,7 @@
 /* static */ HeaderReadWriteUtils::DictionaryFlags
         HeaderReadWriteUtils::createAndGetDictionaryFlagsUsingAttributeMap(
                 const HeaderReadWriteUtils::AttributeMap *const attributeMap) {
-    const bool requiresGermanUmlautProcessing = readBoolAttributeValue(attributeMap,
-            REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY, false /* defaultValue */);
-    const bool requiresFrenchLigatureProcessing = readBoolAttributeValue(attributeMap,
-            REQUIRES_FRENCH_LIGATURE_PROCESSING_KEY, false /* defaultValue */);
-    const bool supportsDynamicUpdate = readBoolAttributeValue(attributeMap,
-            SUPPORTS_DYNAMIC_UPDATE_KEY, false /* defaultValue */);
-    DictionaryFlags dictflags = NO_FLAGS;
-    dictflags |= requiresGermanUmlautProcessing ? GERMAN_UMLAUT_PROCESSING_FLAG : 0;
-    dictflags |= requiresFrenchLigatureProcessing ? FRENCH_LIGATURE_PROCESSING_FLAG : 0;
-    dictflags |= supportsDynamicUpdate ? SUPPORTS_DYNAMIC_UPDATE_FLAG : 0;
-    return dictflags;
+    return NO_FLAGS;
 }
 
 /* static */ void HeaderReadWriteUtils::fetchAllHeaderAttributes(const uint8_t *const dictBuf,
@@ -115,8 +89,8 @@
         case FormatUtils::VERSION_2:
             // Version 2 dictionary writing is not supported.
             return false;
-        case FormatUtils::VERSION_3:
-            return buffer->writeUintAndAdvancePosition(3 /* data */,
+        case FormatUtils::VERSION_4:
+            return buffer->writeUintAndAdvancePosition(FormatUtils::VERSION_4 /* data */,
                     HEADER_DICTIONARY_VERSION_SIZE, writingPos);
         default:
             return false;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h
index 2259683..fc24bbd 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.h
@@ -37,18 +37,6 @@
 
     static DictionaryFlags getFlags(const uint8_t *const dictBuf);
 
-    static AK_FORCE_INLINE bool supportsDynamicUpdate(const DictionaryFlags flags) {
-        return (flags & SUPPORTS_DYNAMIC_UPDATE_FLAG) != 0;
-    }
-
-    static AK_FORCE_INLINE bool requiresGermanUmlautProcessing(const DictionaryFlags flags) {
-        return (flags & GERMAN_UMLAUT_PROCESSING_FLAG) != 0;
-    }
-
-    static AK_FORCE_INLINE bool requiresFrenchLigatureProcessing(const DictionaryFlags flags) {
-        return (flags & FRENCH_LIGATURE_PROCESSING_FLAG) != 0;
-    }
-
     static AK_FORCE_INLINE int getHeaderOptionsPosition() {
         return HEADER_MAGIC_NUMBER_SIZE + HEADER_DICTIONARY_VERSION_SIZE + HEADER_FLAG_SIZE
                 + HEADER_SIZE_FIELD_SIZE;
@@ -101,17 +89,8 @@
     static const int HEADER_FLAG_SIZE;
     static const int HEADER_SIZE_FIELD_SIZE;
 
+    // Value for the "flags" field. It's unused at the moment.
     static const DictionaryFlags NO_FLAGS;
-    // Flags for special processing
-    // Those *must* match the flags in makedict (FormatSpec#*_PROCESSING_FLAGS) or
-    // something very bad (like, the apocalypse) will happen. Please update both at the same time.
-    static const DictionaryFlags GERMAN_UMLAUT_PROCESSING_FLAG;
-    static const DictionaryFlags SUPPORTS_DYNAMIC_UPDATE_FLAG;
-    static const DictionaryFlags FRENCH_LIGATURE_PROCESSING_FLAG;
-
-    static const char *const SUPPORTS_DYNAMIC_UPDATE_KEY;
-    static const char *const REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY;
-    static const char *const REQUIRES_FRENCH_LIGATURE_PROCESSING_KEY;
 
     static void setIntAttributeInner(AttributeMap *const headerAttributes,
             const AttributeMap::key_type *const key, const int value);
diff --git a/native/jni/src/suggest/policyimpl/dictionary/shortcut/dynamic_shortcut_list_policy.h b/native/jni/src/suggest/policyimpl/dictionary/shortcut/dynamic_shortcut_list_policy.h
deleted file mode 100644
index bd3211f..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/shortcut/dynamic_shortcut_list_policy.h
+++ /dev/null
@@ -1,123 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_DYNAMIC_SHORTCUT_LIST_POLICY_H
-#define LATINIME_DYNAMIC_SHORTCUT_LIST_POLICY_H
-
-#include <stdint.h>
-
-#include "defines.h"
-#include "suggest/core/policy/dictionary_shortcuts_structure_policy.h"
-#include "suggest/policyimpl/dictionary/shortcut/shortcut_list_reading_utils.h"
-#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
-
-namespace latinime {
-
-/*
- * This is a dynamic version of ShortcutListPolicy and supports an additional buffer.
- */
-class DynamicShortcutListPolicy : public DictionaryShortcutsStructurePolicy {
- public:
-    explicit DynamicShortcutListPolicy(const BufferWithExtendableBuffer *const buffer)
-            : mBuffer(buffer) {}
-
-    ~DynamicShortcutListPolicy() {}
-
-    int getStartPos(const int pos) const {
-        if (pos == NOT_A_DICT_POS) {
-            return NOT_A_DICT_POS;
-        }
-        return pos + ShortcutListReadingUtils::getShortcutListSizeFieldSize();
-    }
-
-    void getNextShortcut(const int maxCodePointCount, int *const outCodePoint,
-            int *const outCodePointCount, bool *const outIsWhitelist, bool *const outHasNext,
-            int *const pos) const {
-        const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*pos);
-        const uint8_t *const buffer = mBuffer->getBuffer(usesAdditionalBuffer);
-        if (usesAdditionalBuffer) {
-            *pos -= mBuffer->getOriginalBufferSize();
-        }
-        const ShortcutListReadingUtils::ShortcutFlags flags =
-                ShortcutListReadingUtils::getFlagsAndForwardPointer(buffer, pos);
-        if (outHasNext) {
-            *outHasNext = ShortcutListReadingUtils::hasNext(flags);
-        }
-        if (outIsWhitelist) {
-            *outIsWhitelist = ShortcutListReadingUtils::isWhitelist(flags);
-        }
-        if (outCodePoint) {
-            *outCodePointCount = ShortcutListReadingUtils::readShortcutTarget(
-                    buffer, maxCodePointCount, outCodePoint, pos);
-        }
-        if (usesAdditionalBuffer) {
-            *pos += mBuffer->getOriginalBufferSize();
-        }
-    }
-
-    void skipAllShortcuts(int *const pos) const {
-        const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*pos);
-        const uint8_t *const buffer = mBuffer->getBuffer(usesAdditionalBuffer);
-        if (usesAdditionalBuffer) {
-            *pos -= mBuffer->getOriginalBufferSize();
-        }
-        const int shortcutListSize = ShortcutListReadingUtils
-                ::getShortcutListSizeAndForwardPointer(buffer, pos);
-        *pos += shortcutListSize;
-        if (usesAdditionalBuffer) {
-            *pos += mBuffer->getOriginalBufferSize();
-        }
-    }
-
-    // Copy shortcuts from the shortcut list that starts at fromPos in mBuffer to toPos in
-    // bufferToWrite and advance these positions after the shortcut lists. This returns whether
-    // the copy was succeeded or not.
-    bool copyAllShortcutsAndReturnIfSucceededOrNot(BufferWithExtendableBuffer *const bufferToWrite,
-            int *const fromPos, int *const toPos) const {
-        const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(*fromPos);
-        if (usesAdditionalBuffer) {
-            *fromPos -= mBuffer->getOriginalBufferSize();
-        }
-        const int shortcutListSize = ShortcutListReadingUtils
-                ::getShortcutListSizeAndForwardPointer(mBuffer->getBuffer(usesAdditionalBuffer),
-                        fromPos);
-        // Copy shortcut list size.
-        if (!bufferToWrite->writeUintAndAdvancePosition(
-                shortcutListSize + ShortcutListReadingUtils::getShortcutListSizeFieldSize(),
-                ShortcutListReadingUtils::getShortcutListSizeFieldSize(), toPos)) {
-            return false;
-        }
-        // Copy shortcut list.
-        for (int i = 0; i < shortcutListSize; ++i) {
-            const uint8_t data = ByteArrayUtils::readUint8AndAdvancePosition(
-                    mBuffer->getBuffer(usesAdditionalBuffer), fromPos);
-            if (!bufferToWrite->writeUintAndAdvancePosition(data, 1 /* size */, toPos)) {
-                return false;
-            }
-        }
-        if (usesAdditionalBuffer) {
-            *fromPos += mBuffer->getOriginalBufferSize();
-        }
-        return true;
-    }
-
- private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicShortcutListPolicy);
-
-    const BufferWithExtendableBuffer *const mBuffer;
-};
-} // namespace latinime
-#endif // LATINIME_DYNAMIC_SHORTCUT_LIST_POLICY_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/shortcut/ver4_shortcut_list_policy.h b/native/jni/src/suggest/policyimpl/dictionary/shortcut/ver4_shortcut_list_policy.h
new file mode 100644
index 0000000..ae863af
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/shortcut/ver4_shortcut_list_policy.h
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_SHORTCUT_LIST_POLICY_H
+#define LATINIME_VER4_SHORTCUT_LIST_POLICY_H
+
+#include <stdint.h>
+
+#include "defines.h"
+#include "suggest/core/policy/dictionary_shortcuts_structure_policy.h"
+#include "suggest/policyimpl/dictionary/shortcut/shortcut_list_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+
+namespace latinime {
+
+class Ver4ShortcutListPolicy : public DictionaryShortcutsStructurePolicy {
+ public:
+    Ver4ShortcutListPolicy(ShortcutDictContent *const shortcutDictContent,
+            const TerminalPositionLookupTable *const terminalPositionLookupTable)
+            : mShortcutDictContent(shortcutDictContent),
+              mTerminalPositionLookupTable(terminalPositionLookupTable) {}
+
+    ~Ver4ShortcutListPolicy() {}
+
+    int getStartPos(const int pos) const {
+        // The first shortcut entry is located at the head position of the shortcut list.
+        return pos;
+    }
+
+    void getNextShortcut(const int maxCodePointCount, int *const outCodePoint,
+            int *const outCodePointCount, bool *const outIsWhitelist, bool *const outHasNext,
+            int *const pos) const {
+        int probability = 0;
+        mShortcutDictContent->getShortcutEntryAndAdvancePosition(maxCodePointCount,
+                outCodePoint, outCodePointCount, &probability, outHasNext, pos);
+        if (outIsWhitelist) {
+            *outIsWhitelist = ShortcutListReadingUtils::isWhitelist(probability);
+        }
+    }
+
+    void skipAllShortcuts(int *const pos) const {
+        // Do nothing because we don't need to skip shortcut lists in ver4 dictionaries.
+    }
+
+    bool addNewShortcut(const int terminalId, const int *const codePoints, const int codePointCount,
+            const int probability) {
+        const int shortcutListPos = mShortcutDictContent->getShortcutListHeadPos(terminalId);
+        if (shortcutListPos == NOT_A_DICT_POS) {
+            // Create shortcut list.
+            if (!mShortcutDictContent->createNewShortcutList(terminalId)) {
+                AKLOGE("Cannot create new shortcut list. terminal id: %d", terminalId);
+                return false;
+            }
+            const int writingPos =  mShortcutDictContent->getShortcutListHeadPos(terminalId);
+            return mShortcutDictContent->writeShortcutEntry(codePoints, codePointCount, probability,
+                    false /* hasNext */, writingPos);
+        }
+        const int entryPos = mShortcutDictContent->findShortcutEntryAndGetPos(shortcutListPos,
+                codePoints, codePointCount);
+        if (entryPos == NOT_A_DICT_POS) {
+            // Add new entry to the shortcut list.
+            // Create new shortcut list.
+            if (!mShortcutDictContent->createNewShortcutList(terminalId)) {
+                AKLOGE("Cannot create new shortcut list. terminal id: %d", terminalId);
+                return false;
+            }
+            int writingPos =  mShortcutDictContent->getShortcutListHeadPos(terminalId);
+            if (!mShortcutDictContent->writeShortcutEntryAndAdvancePosition(codePoints,
+                    codePointCount, probability, true /* hasNext */, &writingPos)) {
+                AKLOGE("Cannot write shortcut entry. terminal id: %d, pos: %d", terminalId,
+                        writingPos);
+                return false;
+            }
+            return mShortcutDictContent->copyShortcutList(shortcutListPos, writingPos);
+        }
+        // Overwrite existing entry.
+        bool hasNext = false;
+        mShortcutDictContent->getShortcutEntry(MAX_WORD_LENGTH, 0 /* outCodePoint */,
+                0 /* outCodePointCount */ , 0 /* probability */, &hasNext, entryPos);
+        if (!mShortcutDictContent->writeShortcutEntry(codePoints,
+                codePointCount, probability, hasNext, entryPos)) {
+            AKLOGE("Cannot overwrite shortcut entry. terminal id: %d, pos: %d", terminalId,
+                    entryPos);
+            return false;
+        }
+        return true;
+    }
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(Ver4ShortcutListPolicy);
+
+    ShortcutDictContent *const mShortcutDictContent;
+    const TerminalPositionLookupTable *const mTerminalPositionLookupTable;
+};
+} // namespace latinime
+#endif // LATINIME_VER4_SHORTCUT_LIST_POLICY_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
new file mode 100644
index 0000000..c81c61d
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.cpp
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.h"
+
+#include <climits>
+#include <stdint.h>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h"
+#include "suggest/policyimpl/dictionary/utils/file_utils.h"
+#include "suggest/policyimpl/dictionary/utils/format_utils.h"
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+
+namespace latinime {
+
+/* static */ DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+        DictionaryStructureWithBufferPolicyFactory
+                ::newDictionaryStructureWithBufferPolicy(const char *const path,
+                        const int bufOffset, const int size, const bool isUpdatable) {
+    if (FileUtils::existsDir(path)) {
+        // Given path represents a directory.
+        return newPolicyforDirectoryDict(path, isUpdatable);
+    } else {
+        if (isUpdatable) {
+            AKLOGE("One file dictionaries don't support updating. path: %s", path);
+            ASSERT(false);
+            return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(0);
+        }
+        return newPolicyforFileDict(path, bufOffset, size);
+    }
+}
+
+/* static */ DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+        DictionaryStructureWithBufferPolicyFactory::newPolicyforDirectoryDict(
+                const char *const path, const bool isUpdatable) {
+    const int headerFilePathBufSize = PATH_MAX + 1 /* terminator */;
+    char headerFilePath[headerFilePathBufSize];
+    getHeaderFilePathInDictDir(path, headerFilePathBufSize, headerFilePath);
+    // Allocated buffer in MmapedBuffer::openBuffer() will be freed in the destructor of
+    // MmappedBufferPtr if the instance has the responsibility.
+    MmappedBuffer::MmappedBufferPtr mmappedBuffer = MmappedBuffer::openBuffer(headerFilePath,
+            isUpdatable);
+    if (!mmappedBuffer.get()) {
+        return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(0);
+    }
+    switch (FormatUtils::detectFormatVersion(mmappedBuffer.get()->getBuffer(),
+            mmappedBuffer.get()->getBufferSize())) {
+        case FormatUtils::VERSION_2:
+            AKLOGE("Given path is a directory but the format is version 2. path: %s", path);
+            break;
+        case FormatUtils::VERSION_4: {
+            const int dictDirPathBufSize = strlen(headerFilePath) + 1 /* terminator */;
+            char dictPath[dictDirPathBufSize];
+            if (!FileUtils::getFilePathWithoutSuffix(headerFilePath,
+                    Ver4DictConstants::HEADER_FILE_EXTENSION, dictDirPathBufSize, dictPath)) {
+                AKLOGE("Dictionary file name is not valid as a ver4 dictionary. path: %s", path);
+                ASSERT(false);
+                return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(0);
+            }
+            const Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers =
+                    Ver4DictBuffers::openVer4DictBuffers(dictPath, mmappedBuffer);
+            if (!dictBuffers.get()->isValid()) {
+                AKLOGE("DICT: The dictionary doesn't satisfy ver4 format requirements. path: %s",
+                        path);
+                ASSERT(false);
+                return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(0);
+            }
+            return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(
+                    new Ver4PatriciaTriePolicy(dictBuffers));
+        }
+        default:
+            AKLOGE("DICT: dictionary format is unknown, bad magic number. path: %s", path);
+            break;
+    }
+    ASSERT(false);
+    return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(0);
+}
+
+/* static */ DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+        DictionaryStructureWithBufferPolicyFactory::newPolicyforFileDict(
+                const char *const path, const int bufOffset, const int size) {
+    // Allocated buffer in MmapedBuffer::openBuffer() will be freed in the destructor of
+    // MmappedBufferPtr if the instance has the responsibility.
+    MmappedBuffer::MmappedBufferPtr mmappedBuffer = MmappedBuffer::openBuffer(path, bufOffset,
+            size, false /* isUpdatable */);
+    if (!mmappedBuffer.get()) {
+        return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(0);
+    }
+    switch (FormatUtils::detectFormatVersion(mmappedBuffer.get()->getBuffer(),
+            mmappedBuffer.get()->getBufferSize())) {
+        case FormatUtils::VERSION_2:
+            return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(
+                    new PatriciaTriePolicy(mmappedBuffer));
+        case FormatUtils::VERSION_4:
+            AKLOGE("Given path is a file but the format is version 4. path: %s", path);
+            break;
+        default:
+            AKLOGE("DICT: dictionary format is unknown, bad magic number. path: %s", path);
+            break;
+    }
+    ASSERT(false);
+    return DictionaryStructureWithBufferPolicy::StructurePolicyPtr(0);
+}
+
+/* static */ void DictionaryStructureWithBufferPolicyFactory::getHeaderFilePathInDictDir(
+        const char *const dictDirPath, const int outHeaderFileBufSize,
+        char *const outHeaderFilePath) {
+    const int dictNameBufSize = strlen(dictDirPath) + 1 /* terminator */;
+    char dictName[dictNameBufSize];
+    FileUtils::getBasename(dictDirPath, dictNameBufSize, dictName);
+    snprintf(outHeaderFilePath, outHeaderFileBufSize, "%s/%s%s", dictDirPath,
+            dictName, Ver4DictConstants::HEADER_FILE_EXTENSION);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.h b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.h
similarity index 60%
rename from native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.h
rename to native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.h
index 8cebc3b..45ab529 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/dictionary_structure_with_buffer_policy_factory.h
@@ -21,16 +21,27 @@
 
 #include "defines.h"
 #include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
+#include "utils/exclusive_ownership_pointer.h"
 
 namespace latinime {
 
 class DictionaryStructureWithBufferPolicyFactory {
  public:
-    static DictionaryStructureWithBufferPolicy *newDictionaryStructureWithBufferPolicy(
-            const char *const path, const int bufOffset, const int size, const bool isUpdatable);
+    static DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+            newDictionaryStructureWithBufferPolicy(const char *const path, const int bufOffset,
+                    const int size, const bool isUpdatable);
 
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(DictionaryStructureWithBufferPolicyFactory);
+
+    static DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+            newPolicyforDirectoryDict(const char *const path, const bool isUpdatable);
+
+    static DictionaryStructureWithBufferPolicy::StructurePolicyPtr
+            newPolicyforFileDict(const char *const path, const int bufOffset, const int size);
+
+    static void getHeaderFilePathInDictDir(const char *const dirPath,
+            const int outHeaderFileBufSize, char *const outHeaderFilePath);
 };
 } // namespace latinime
 #endif // LATINIME_DICTIONARY_STRUCTURE_WITH_BUFFER_POLICY_FACTORY_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.cpp
new file mode 100644
index 0000000..8f42df6
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.h"
+
+#include "suggest/core/policy/dictionary_header_structure_policy.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h"
+
+namespace latinime {
+
+bool DynamicPtGcEventListeners
+        ::TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
+                ::onVisitingPtNode(const PtNodeParams *const ptNodeParams) {
+    // PtNode is useless when the PtNode is not a terminal and doesn't have any not useless
+    // children.
+    bool isUselessPtNode = !ptNodeParams->isTerminal();
+    if (ptNodeParams->isTerminal()) {
+        bool needsToKeepPtNode = true;
+        if (!mPtNodeWriter->updatePtNodeProbabilityAndGetNeedsToKeepPtNodeAfterGC(ptNodeParams,
+                &needsToKeepPtNode)) {
+            AKLOGE("Cannot update PtNode probability or get needs to keep PtNode after GC.");
+            return false;
+        }
+        if (!needsToKeepPtNode) {
+            isUselessPtNode = true;
+        }
+    }
+    if (mChildrenValue > 0) {
+        isUselessPtNode = false;
+    } else if (ptNodeParams->isTerminal()) {
+        // Remove children as all children are useless.
+        if (!mPtNodeWriter->updateChildrenPosition(ptNodeParams,
+                NOT_A_DICT_POS /* newChildrenPosition */)) {
+            return false;
+        }
+    }
+    if (isUselessPtNode) {
+        // Current PtNode is no longer needed. Mark it as deleted.
+        if (!mPtNodeWriter->markPtNodeAsDeleted(ptNodeParams)) {
+            return false;
+        }
+    } else {
+        mValueStack.back() += 1;
+        if (ptNodeParams->isTerminal()) {
+            mValidUnigramCount += 1;
+        }
+    }
+    return true;
+}
+
+bool DynamicPtGcEventListeners::TraversePolicyToUpdateBigramProbability
+        ::onVisitingPtNode(const PtNodeParams *const ptNodeParams) {
+    if (!ptNodeParams->isDeleted() && ptNodeParams->hasBigrams()) {
+        int bigramEntryCount = 0;
+        if (!mPtNodeWriter->updateAllBigramEntriesAndDeleteUselessEntries(ptNodeParams,
+                &bigramEntryCount)) {
+            return false;
+        }
+        mValidBigramEntryCount += bigramEntryCount;
+    }
+    return true;
+}
+
+// Writes dummy PtNode array size when the head of PtNode array is read.
+bool DynamicPtGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
+        ::onDescend(const int ptNodeArrayPos) {
+    mValidPtNodeCount = 0;
+    int writingPos = mBufferToWrite->getTailPosition();
+    mDictPositionRelocationMap->mPtNodeArrayPositionRelocationMap.insert(
+            PtNodeWriter::PtNodeArrayPositionRelocationMap::value_type(ptNodeArrayPos, writingPos));
+    // Writes dummy PtNode array size because arrays can have a forward link or needles PtNodes.
+    // This field will be updated later in onReadingPtNodeArrayTail() with actual PtNode count.
+    mPtNodeArraySizeFieldPos = writingPos;
+    return DynamicPtWritingUtils::writePtNodeArraySizeAndAdvancePosition(
+            mBufferToWrite, 0 /* arraySize */, &writingPos);
+}
+
+// Write PtNode array terminal and actual PtNode array size.
+bool DynamicPtGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
+        ::onReadingPtNodeArrayTail() {
+    int writingPos = mBufferToWrite->getTailPosition();
+    // Write PtNode array terminal.
+    if (!DynamicPtWritingUtils::writeForwardLinkPositionAndAdvancePosition(
+            mBufferToWrite, NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
+        return false;
+    }
+    // Write actual PtNode array size.
+    if (!DynamicPtWritingUtils::writePtNodeArraySizeAndAdvancePosition(
+            mBufferToWrite, mValidPtNodeCount, &mPtNodeArraySizeFieldPos)) {
+        return false;
+    }
+    return true;
+}
+
+// Write valid PtNode to buffer and memorize mapping from the old position to the new position.
+bool DynamicPtGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
+        ::onVisitingPtNode(const PtNodeParams *const ptNodeParams) {
+    if (ptNodeParams->isDeleted()) {
+        // Current PtNode is not written in new buffer because it has been deleted.
+        mDictPositionRelocationMap->mPtNodePositionRelocationMap.insert(
+                PtNodeWriter::PtNodePositionRelocationMap::value_type(
+                        ptNodeParams->getHeadPos(), NOT_A_DICT_POS));
+        return true;
+    }
+    int writingPos = mBufferToWrite->getTailPosition();
+    mDictPositionRelocationMap->mPtNodePositionRelocationMap.insert(
+            PtNodeWriter::PtNodePositionRelocationMap::value_type(
+                    ptNodeParams->getHeadPos(), writingPos));
+    mValidPtNodeCount++;
+    // Writes current PtNode.
+    return mPtNodeWriter->writePtNodeAndAdvancePosition(ptNodeParams, &writingPos);
+}
+
+bool DynamicPtGcEventListeners::TraversePolicyToUpdateAllPositionFields
+        ::onVisitingPtNode(const PtNodeParams *const ptNodeParams) {
+    // Updates parent position.
+    int bigramCount = 0;
+    if (!mPtNodeWriter->updateAllPositionFields(ptNodeParams, mDictPositionRelocationMap,
+            &bigramCount)) {
+        return false;
+    }
+    mBigramCount += bigramCount;
+    if (ptNodeParams->isTerminal()) {
+        mUnigramCount++;
+    }
+    return true;
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.h
new file mode 100644
index 0000000..d886775
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.h
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_DYNAMIC_PT_GC_EVENT_LISTENERS_H
+#define LATINIME_DYNAMIC_PT_GC_EVENT_LISTENERS_H
+
+#include <vector>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "utils/hash_map_compat.h"
+
+namespace latinime {
+
+class PtNodeParams;
+
+class DynamicPtGcEventListeners {
+ public:
+    // Updates all PtNodes that can be reached from the root. Checks if each PtNode is useless or
+    // not and marks useless PtNodes as deleted. Such deleted PtNodes will be discarded in the GC.
+    // TODO: Concatenate non-terminal PtNodes.
+    class TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
+        : public DynamicPtReadingHelper::TraversingEventListener {
+     public:
+        TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted(
+                PtNodeWriter *const ptNodeWriter)
+                : mPtNodeWriter(ptNodeWriter), mValueStack(), mChildrenValue(0),
+                  mValidUnigramCount(0) {}
+
+        ~TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted() {};
+
+        bool onAscend() {
+            if (mValueStack.empty()) {
+                return false;
+            }
+            mChildrenValue = mValueStack.back();
+            mValueStack.pop_back();
+            return true;
+        }
+
+        bool onDescend(const int ptNodeArrayPos) {
+            mValueStack.push_back(0);
+            mChildrenValue = 0;
+            return true;
+        }
+
+        bool onReadingPtNodeArrayTail() { return true; }
+
+        bool onVisitingPtNode(const PtNodeParams *const ptNodeParams);
+
+        int getValidUnigramCount() const {
+            return mValidUnigramCount;
+        }
+
+     private:
+        DISALLOW_IMPLICIT_CONSTRUCTORS(
+                TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted);
+
+        PtNodeWriter *const mPtNodeWriter;
+        std::vector<int> mValueStack;
+        int mChildrenValue;
+        int mValidUnigramCount;
+    };
+
+    // Updates all bigram entries that are held by valid PtNodes. This removes useless bigram
+    // entries.
+    class TraversePolicyToUpdateBigramProbability
+            : public DynamicPtReadingHelper::TraversingEventListener {
+     public:
+        TraversePolicyToUpdateBigramProbability(PtNodeWriter *const ptNodeWriter)
+                : mPtNodeWriter(ptNodeWriter), mValidBigramEntryCount(0) {}
+
+        bool onAscend() { return true; }
+
+        bool onDescend(const int ptNodeArrayPos) { return true; }
+
+        bool onReadingPtNodeArrayTail() { return true; }
+
+        bool onVisitingPtNode(const PtNodeParams *const ptNodeParams);
+
+        int getValidBigramEntryCount() const {
+            return mValidBigramEntryCount;
+        }
+
+     private:
+        DISALLOW_IMPLICIT_CONSTRUCTORS(TraversePolicyToUpdateBigramProbability);
+
+        PtNodeWriter *const mPtNodeWriter;
+        int mValidBigramEntryCount;
+    };
+
+    class TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
+            : public DynamicPtReadingHelper::TraversingEventListener {
+     public:
+        TraversePolicyToPlaceAndWriteValidPtNodesToBuffer(
+                PtNodeWriter *const ptNodeWriter, BufferWithExtendableBuffer *const bufferToWrite,
+                PtNodeWriter::DictPositionRelocationMap *const dictPositionRelocationMap)
+                : mPtNodeWriter(ptNodeWriter), mBufferToWrite(bufferToWrite),
+                  mDictPositionRelocationMap(dictPositionRelocationMap), mValidPtNodeCount(0),
+                  mPtNodeArraySizeFieldPos(NOT_A_DICT_POS) {};
+
+        bool onAscend() { return true; }
+
+        bool onDescend(const int ptNodeArrayPos);
+
+        bool onReadingPtNodeArrayTail();
+
+        bool onVisitingPtNode(const PtNodeParams *const ptNodeParams);
+
+     private:
+        DISALLOW_IMPLICIT_CONSTRUCTORS(TraversePolicyToPlaceAndWriteValidPtNodesToBuffer);
+
+        PtNodeWriter *const mPtNodeWriter;
+        BufferWithExtendableBuffer *const mBufferToWrite;
+        PtNodeWriter::DictPositionRelocationMap *const mDictPositionRelocationMap;
+        int mValidPtNodeCount;
+        int mPtNodeArraySizeFieldPos;
+    };
+
+    class TraversePolicyToUpdateAllPositionFields
+            : public DynamicPtReadingHelper::TraversingEventListener {
+     public:
+        TraversePolicyToUpdateAllPositionFields(PtNodeWriter *const ptNodeWriter,
+                const PtNodeWriter::DictPositionRelocationMap *const dictPositionRelocationMap)
+                : mPtNodeWriter(ptNodeWriter),
+                  mDictPositionRelocationMap(dictPositionRelocationMap), mUnigramCount(0),
+                  mBigramCount(0) {};
+
+        bool onAscend() { return true; }
+
+        bool onDescend(const int ptNodeArrayPos) { return true; }
+
+        bool onReadingPtNodeArrayTail() { return true; }
+
+        bool onVisitingPtNode(const PtNodeParams *const ptNodeParams);
+
+        int getUnigramCount() const {
+            return mUnigramCount;
+        }
+
+        int getBigramCount() const {
+            return mBigramCount;
+        }
+
+     private:
+        DISALLOW_IMPLICIT_CONSTRUCTORS(TraversePolicyToUpdateAllPositionFields);
+
+        PtNodeWriter *const mPtNodeWriter;
+        const PtNodeWriter::DictPositionRelocationMap *const mDictPositionRelocationMap;
+        int mUnigramCount;
+        int mBigramCount;
+    };
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPtGcEventListeners);
+};
+} // namespace latinime
+#endif /* LATINIME_DYNAMIC_PT_GC_EVENT_LISTENERS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.cpp
new file mode 100644
index 0000000..b918e07
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.cpp
@@ -0,0 +1,342 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h"
+
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
+#include "utils/char_utils.h"
+
+namespace latinime {
+
+// To avoid infinite loop caused by invalid or malicious forward links.
+const int DynamicPtReadingHelper::MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP = 100000;
+const int DynamicPtReadingHelper::MAX_PT_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP = 100000;
+const size_t DynamicPtReadingHelper::MAX_READING_STATE_STACK_SIZE = MAX_WORD_LENGTH;
+
+// Visits all PtNodes in post-order depth first manner.
+// For example, visits c -> b -> y -> x -> a for the following dictionary:
+// a _ b _ c
+//   \ x _ y
+bool DynamicPtReadingHelper::traverseAllPtNodesInPostorderDepthFirstManner(
+        TraversingEventListener *const listener) {
+    bool alreadyVisitedChildren = false;
+    // Descend from the root to the root PtNode array.
+    if (!listener->onDescend(getPosOfLastPtNodeArrayHead())) {
+        return false;
+    }
+    while (!isEnd()) {
+        const PtNodeParams ptNodeParams(getPtNodeParams());
+        if (!ptNodeParams.isValid()) {
+            break;
+        }
+        if (!alreadyVisitedChildren) {
+            if (ptNodeParams.hasChildren()) {
+                // Move to the first child.
+                if (!listener->onDescend(ptNodeParams.getChildrenPos())) {
+                    return false;
+                }
+                pushReadingStateToStack();
+                readChildNode(ptNodeParams);
+            } else {
+                alreadyVisitedChildren = true;
+            }
+        } else {
+            if (!listener->onVisitingPtNode(&ptNodeParams)) {
+                return false;
+            }
+            readNextSiblingNode(ptNodeParams);
+            if (isEnd()) {
+                // All PtNodes in current linked PtNode arrays have been visited.
+                // Return to the parent.
+                if (!listener->onReadingPtNodeArrayTail()) {
+                    return false;
+                }
+                if (mReadingStateStack.size() <= 0) {
+                    break;
+                }
+                if (!listener->onAscend()) {
+                    return false;
+                }
+                popReadingStateFromStack();
+                alreadyVisitedChildren = true;
+            } else {
+                // Process sibling PtNode.
+                alreadyVisitedChildren = false;
+            }
+        }
+    }
+    // Ascend from the root PtNode array to the root.
+    if (!listener->onAscend()) {
+        return false;
+    }
+    return !isError();
+}
+
+// Visits all PtNodes in PtNode array level pre-order depth first manner, which is the same order
+// that PtNodes are written in the dictionary buffer.
+// For example, visits a -> b -> x -> c -> y for the following dictionary:
+// a _ b _ c
+//   \ x _ y
+bool DynamicPtReadingHelper::traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
+        TraversingEventListener *const listener) {
+    bool alreadyVisitedAllPtNodesInArray = false;
+    bool alreadyVisitedChildren = false;
+    // Descend from the root to the root PtNode array.
+    if (!listener->onDescend(getPosOfLastPtNodeArrayHead())) {
+        return false;
+    }
+    if (isEnd()) {
+        // Empty dictionary. Needs to notify the listener of the tail of empty PtNode array.
+        if (!listener->onReadingPtNodeArrayTail()) {
+            return false;
+        }
+    }
+    pushReadingStateToStack();
+    while (!isEnd()) {
+        const PtNodeParams ptNodeParams(getPtNodeParams());
+        if (!ptNodeParams.isValid()) {
+            break;
+        }
+        if (alreadyVisitedAllPtNodesInArray) {
+            if (alreadyVisitedChildren) {
+                // Move to next sibling PtNode's children.
+                readNextSiblingNode(ptNodeParams);
+                if (isEnd()) {
+                    // Return to the parent PTNode.
+                    if (!listener->onAscend()) {
+                        return false;
+                    }
+                    if (mReadingStateStack.size() <= 0) {
+                        break;
+                    }
+                    popReadingStateFromStack();
+                    alreadyVisitedChildren = true;
+                    alreadyVisitedAllPtNodesInArray = true;
+                } else {
+                    alreadyVisitedChildren = false;
+                }
+            } else {
+                if (ptNodeParams.hasChildren()) {
+                    // Move to the first child.
+                    if (!listener->onDescend(ptNodeParams.getChildrenPos())) {
+                        return false;
+                    }
+                    pushReadingStateToStack();
+                    readChildNode(ptNodeParams);
+                    // Push state to return the head of PtNode array.
+                    pushReadingStateToStack();
+                    alreadyVisitedAllPtNodesInArray = false;
+                    alreadyVisitedChildren = false;
+                } else {
+                    alreadyVisitedChildren = true;
+                }
+            }
+        } else {
+            if (!listener->onVisitingPtNode(&ptNodeParams)) {
+                return false;
+            }
+            readNextSiblingNode(ptNodeParams);
+            if (isEnd()) {
+                if (!listener->onReadingPtNodeArrayTail()) {
+                    return false;
+                }
+                // Return to the head of current PtNode array.
+                popReadingStateFromStack();
+                alreadyVisitedAllPtNodesInArray = true;
+            }
+        }
+    }
+    popReadingStateFromStack();
+    // Ascend from the root PtNode array to the root.
+    if (!listener->onAscend()) {
+        return false;
+    }
+    return !isError();
+}
+
+int DynamicPtReadingHelper::getCodePointsAndProbabilityAndReturnCodePointCount(
+        const int maxCodePointCount, int *const outCodePoints, int *const outUnigramProbability) {
+    // This method traverses parent nodes from the terminal by following parent pointers; thus,
+    // node code points are stored in the buffer in the reverse order.
+    int reverseCodePoints[maxCodePointCount];
+    const PtNodeParams terminalPtNodeParams(getPtNodeParams());
+    // First, read the terminal node and get its probability.
+    if (!isValidTerminalNode(terminalPtNodeParams)) {
+        // Node at the ptNodePos is not a valid terminal node.
+        *outUnigramProbability = NOT_A_PROBABILITY;
+        return 0;
+    }
+    // Store terminal node probability.
+    *outUnigramProbability = terminalPtNodeParams.getProbability();
+    // Then, following parent node link to the dictionary root and fetch node code points.
+    int totalCodePointCount = 0;
+    while (!isEnd()) {
+        const PtNodeParams ptNodeParams(getPtNodeParams());
+        totalCodePointCount = getTotalCodePointCount(ptNodeParams);
+        if (!ptNodeParams.isValid() || totalCodePointCount > maxCodePointCount) {
+            // The ptNodePos is not a valid terminal node position in the dictionary.
+            *outUnigramProbability = NOT_A_PROBABILITY;
+            return 0;
+        }
+        // Store node code points to buffer in the reverse order.
+        fetchMergedNodeCodePointsInReverseOrder(ptNodeParams, getPrevTotalCodePointCount(),
+                reverseCodePoints);
+        // Follow parent node toward the root node.
+        readParentNode(ptNodeParams);
+    }
+    if (isError()) {
+        // The node position or the dictionary is invalid.
+        *outUnigramProbability = NOT_A_PROBABILITY;
+        return 0;
+    }
+    // Reverse the stored code points to output them.
+    for (int i = 0; i < totalCodePointCount; ++i) {
+        outCodePoints[i] = reverseCodePoints[totalCodePointCount - i - 1];
+    }
+    return totalCodePointCount;
+}
+
+int DynamicPtReadingHelper::getTerminalPtNodePositionOfWord(const int *const inWord,
+        const int length, const bool forceLowerCaseSearch) {
+    int searchCodePoints[length];
+    for (int i = 0; i < length; ++i) {
+        searchCodePoints[i] = forceLowerCaseSearch ? CharUtils::toLowerCase(inWord[i]) : inWord[i];
+    }
+    while (!isEnd()) {
+        const PtNodeParams ptNodeParams(getPtNodeParams());
+        const int matchedCodePointCount = getPrevTotalCodePointCount();
+        if (getTotalCodePointCount(ptNodeParams) > length
+                || !isMatchedCodePoint(ptNodeParams, 0 /* index */,
+                        searchCodePoints[matchedCodePointCount])) {
+            // Current node has too many code points or its first code point is different from
+            // target code point. Skip this node and read the next sibling node.
+            readNextSiblingNode(ptNodeParams);
+            continue;
+        }
+        // Check following merged node code points.
+        const int nodeCodePointCount = ptNodeParams.getCodePointCount();
+        for (int j = 1; j < nodeCodePointCount; ++j) {
+            if (!isMatchedCodePoint(ptNodeParams, j, searchCodePoints[matchedCodePointCount + j])) {
+                // Different code point is found. The given word is not included in the dictionary.
+                return NOT_A_DICT_POS;
+            }
+        }
+        // All characters are matched.
+        if (length == getTotalCodePointCount(ptNodeParams)) {
+            if (!ptNodeParams.isTerminal()) {
+                return NOT_A_DICT_POS;
+            }
+            // Terminal position is found.
+            return ptNodeParams.getHeadPos();
+        }
+        if (!ptNodeParams.hasChildren()) {
+            return NOT_A_DICT_POS;
+        }
+        // Advance to the children nodes.
+        readChildNode(ptNodeParams);
+    }
+    // If we already traversed the tree further than the word is long, there means
+    // there was no match (or we would have found it).
+    return NOT_A_DICT_POS;
+}
+
+// Read node array size and process empty node arrays. Nodes and arrays are counted up in this
+// method to avoid an infinite loop.
+void DynamicPtReadingHelper::nextPtNodeArray() {
+    if (mReadingState.mPos < 0 || mReadingState.mPos >= mBuffer->getTailPosition()) {
+        // Reading invalid position because of a bug or a broken dictionary.
+        AKLOGE("Reading PtNode array info from invalid dictionary position: %d, dict size: %d",
+                mReadingState.mPos, mBuffer->getTailPosition());
+        ASSERT(false);
+        mIsError = true;
+        mReadingState.mPos = NOT_A_DICT_POS;
+        return;
+    }
+    mReadingState.mPosOfThisPtNodeArrayHead = mReadingState.mPos;
+    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(mReadingState.mPos);
+    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
+    if (usesAdditionalBuffer) {
+        mReadingState.mPos -= mBuffer->getOriginalBufferSize();
+    }
+    mReadingState.mRemainingPtNodeCountInThisArray =
+            PatriciaTrieReadingUtils::getPtNodeArraySizeAndAdvancePosition(dictBuf,
+                    &mReadingState.mPos);
+    if (usesAdditionalBuffer) {
+        mReadingState.mPos += mBuffer->getOriginalBufferSize();
+    }
+    // Count up nodes and node arrays to avoid infinite loop.
+    mReadingState.mTotalPtNodeIndexInThisArrayChain +=
+            mReadingState.mRemainingPtNodeCountInThisArray;
+    mReadingState.mPtNodeArrayIndexInThisArrayChain++;
+    if (mReadingState.mRemainingPtNodeCountInThisArray < 0
+            || mReadingState.mTotalPtNodeIndexInThisArrayChain
+                    > MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP
+            || mReadingState.mPtNodeArrayIndexInThisArrayChain
+                    > MAX_PT_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP) {
+        // Invalid dictionary.
+        AKLOGI("Invalid dictionary. nodeCount: %d, totalNodeCount: %d, MAX_CHILD_COUNT: %d"
+                "nodeArrayCount: %d, MAX_NODE_ARRAY_COUNT: %d",
+                mReadingState.mRemainingPtNodeCountInThisArray,
+                mReadingState.mTotalPtNodeIndexInThisArrayChain,
+                MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP,
+                mReadingState.mPtNodeArrayIndexInThisArrayChain,
+                MAX_PT_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP);
+        ASSERT(false);
+        mIsError = true;
+        mReadingState.mPos = NOT_A_DICT_POS;
+        return;
+    }
+    if (mReadingState.mRemainingPtNodeCountInThisArray == 0) {
+        // Empty node array. Try following forward link.
+        followForwardLink();
+    }
+}
+
+// Follow the forward link and read the next node array if exists.
+void DynamicPtReadingHelper::followForwardLink() {
+    if (mReadingState.mPos < 0 || mReadingState.mPos >= mBuffer->getTailPosition()) {
+        // Reading invalid position because of bug or broken dictionary.
+        AKLOGE("Reading forward link from invalid dictionary position: %d, dict size: %d",
+                mReadingState.mPos, mBuffer->getTailPosition());
+        ASSERT(false);
+        mIsError = true;
+        mReadingState.mPos = NOT_A_DICT_POS;
+        return;
+    }
+    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(mReadingState.mPos);
+    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
+    if (usesAdditionalBuffer) {
+        mReadingState.mPos -= mBuffer->getOriginalBufferSize();
+    }
+    const int forwardLinkPosition =
+            DynamicPtReadingUtils::getForwardLinkPosition(dictBuf, mReadingState.mPos);
+    if (usesAdditionalBuffer) {
+        mReadingState.mPos += mBuffer->getOriginalBufferSize();
+    }
+    mReadingState.mPosOfLastForwardLinkField = mReadingState.mPos;
+    if (DynamicPtReadingUtils::isValidForwardLinkPosition(forwardLinkPosition)) {
+        // Follow the forward link.
+        mReadingState.mPos += forwardLinkPosition;
+        nextPtNodeArray();
+    } else {
+        // All node arrays have been read.
+        mReadingState.mPos = NOT_A_DICT_POS;
+    }
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h
new file mode 100644
index 0000000..a694909
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_DYNAMIC_PT_READING_HELPER_H
+#define LATINIME_DYNAMIC_PT_READING_HELPER_H
+
+#include <cstddef>
+#include <vector>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_reader.h"
+
+namespace latinime {
+
+class BufferWithExtendableBuffer;
+class DictionaryBigramsStructurePolicy;
+class DictionaryShortcutsStructurePolicy;
+
+/*
+ * This class is used for traversing dynamic patricia trie. This class supports iterating nodes and
+ * dealing with additional buffer. This class counts nodes and node arrays to avoid infinite loop.
+ */
+class DynamicPtReadingHelper {
+ public:
+    class TraversingEventListener {
+     public:
+        virtual ~TraversingEventListener() {};
+
+        // Returns whether the event handling was succeeded or not.
+        virtual bool onAscend() = 0;
+
+        // Returns whether the event handling was succeeded or not.
+        virtual bool onDescend(const int ptNodeArrayPos) = 0;
+
+        // Returns whether the event handling was succeeded or not.
+        virtual bool onReadingPtNodeArrayTail() = 0;
+
+        // Returns whether the event handling was succeeded or not.
+        virtual bool onVisitingPtNode(const PtNodeParams *const node) = 0;
+
+     protected:
+        TraversingEventListener() {};
+
+     private:
+        DISALLOW_COPY_AND_ASSIGN(TraversingEventListener);
+    };
+
+    DynamicPtReadingHelper(const BufferWithExtendableBuffer *const buffer,
+            const PtNodeReader *const ptNodeReader)
+            : mIsError(false), mReadingState(), mBuffer(buffer),
+              mPtNodeReader(ptNodeReader), mReadingStateStack() {}
+
+    ~DynamicPtReadingHelper() {}
+
+    AK_FORCE_INLINE bool isError() const {
+        return mIsError;
+    }
+
+    AK_FORCE_INLINE bool isEnd() const {
+        return mReadingState.mPos == NOT_A_DICT_POS;
+    }
+
+    // Initialize reading state with the head position of a PtNode array.
+    AK_FORCE_INLINE void initWithPtNodeArrayPos(const int ptNodeArrayPos) {
+        if (ptNodeArrayPos == NOT_A_DICT_POS) {
+            mReadingState.mPos = NOT_A_DICT_POS;
+        } else {
+            mIsError = false;
+            mReadingState.mPos = ptNodeArrayPos;
+            mReadingState.mTotalCodePointCountSinceInitialization = 0;
+            mReadingState.mTotalPtNodeIndexInThisArrayChain = 0;
+            mReadingState.mPtNodeArrayIndexInThisArrayChain = 0;
+            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
+            mReadingStateStack.clear();
+            nextPtNodeArray();
+        }
+    }
+
+    // Initialize reading state with the head position of a node.
+    AK_FORCE_INLINE void initWithPtNodePos(const int ptNodePos) {
+        if (ptNodePos == NOT_A_DICT_POS) {
+            mReadingState.mPos = NOT_A_DICT_POS;
+        } else {
+            mIsError = false;
+            mReadingState.mPos = ptNodePos;
+            mReadingState.mRemainingPtNodeCountInThisArray = 1;
+            mReadingState.mTotalCodePointCountSinceInitialization = 0;
+            mReadingState.mTotalPtNodeIndexInThisArrayChain = 1;
+            mReadingState.mPtNodeArrayIndexInThisArrayChain = 1;
+            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
+            mReadingState.mPosOfThisPtNodeArrayHead = NOT_A_DICT_POS;
+            mReadingStateStack.clear();
+        }
+    }
+
+    AK_FORCE_INLINE const PtNodeParams getPtNodeParams() const {
+        if (isEnd()) {
+            return PtNodeParams();
+        }
+        return mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(mReadingState.mPos);
+    }
+
+    AK_FORCE_INLINE bool isValidTerminalNode(const PtNodeParams &ptNodeParams) const {
+        return !isEnd() && !ptNodeParams.isDeleted() && ptNodeParams.isTerminal();
+    }
+
+    AK_FORCE_INLINE bool isMatchedCodePoint(const PtNodeParams &ptNodeParams, const int index,
+            const int codePoint) const {
+        return ptNodeParams.getCodePoints()[index] == codePoint;
+    }
+
+    // Return code point count exclude the last read node's code points.
+    AK_FORCE_INLINE int getPrevTotalCodePointCount() const {
+        return mReadingState.mTotalCodePointCountSinceInitialization;
+    }
+
+    // Return code point count include the last read node's code points.
+    AK_FORCE_INLINE int getTotalCodePointCount(const PtNodeParams &ptNodeParams) const {
+        return mReadingState.mTotalCodePointCountSinceInitialization
+                + ptNodeParams.getCodePointCount();
+    }
+
+    AK_FORCE_INLINE void fetchMergedNodeCodePointsInReverseOrder(const PtNodeParams &ptNodeParams,
+            const int index, int *const outCodePoints) const {
+        const int nodeCodePointCount = ptNodeParams.getCodePointCount();
+        const int *const nodeCodePoints = ptNodeParams.getCodePoints();
+        for (int i =  0; i < nodeCodePointCount; ++i) {
+            outCodePoints[index + i] = nodeCodePoints[nodeCodePointCount - 1 - i];
+        }
+    }
+
+    AK_FORCE_INLINE void readNextSiblingNode(const PtNodeParams &ptNodeParams) {
+        mReadingState.mRemainingPtNodeCountInThisArray -= 1;
+        mReadingState.mPos = ptNodeParams.getSiblingNodePos();
+        if (mReadingState.mRemainingPtNodeCountInThisArray <= 0) {
+            // All nodes in the current node array have been read.
+            followForwardLink();
+        }
+    }
+
+    // Read the first child node of the current node.
+    AK_FORCE_INLINE void readChildNode(const PtNodeParams &ptNodeParams) {
+        if (ptNodeParams.hasChildren()) {
+            mReadingState.mTotalCodePointCountSinceInitialization +=
+                    ptNodeParams.getCodePointCount();
+            mReadingState.mTotalPtNodeIndexInThisArrayChain = 0;
+            mReadingState.mPtNodeArrayIndexInThisArrayChain = 0;
+            mReadingState.mPos = ptNodeParams.getChildrenPos();
+            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
+            // Read children node array.
+            nextPtNodeArray();
+        } else {
+            mReadingState.mPos = NOT_A_DICT_POS;
+        }
+    }
+
+    // Read the parent node of the current node.
+    AK_FORCE_INLINE void readParentNode(const PtNodeParams &ptNodeParams) {
+        if (ptNodeParams.getParentPos() != NOT_A_DICT_POS) {
+            mReadingState.mTotalCodePointCountSinceInitialization +=
+                    ptNodeParams.getCodePointCount();
+            mReadingState.mTotalPtNodeIndexInThisArrayChain = 1;
+            mReadingState.mPtNodeArrayIndexInThisArrayChain = 1;
+            mReadingState.mRemainingPtNodeCountInThisArray = 1;
+            mReadingState.mPos = ptNodeParams.getParentPos();
+            mReadingState.mPosOfLastForwardLinkField = NOT_A_DICT_POS;
+            mReadingState.mPosOfThisPtNodeArrayHead = NOT_A_DICT_POS;
+        } else {
+            mReadingState.mPos = NOT_A_DICT_POS;
+        }
+    }
+
+    AK_FORCE_INLINE int getPosOfLastForwardLinkField() const {
+        return mReadingState.mPosOfLastForwardLinkField;
+    }
+
+    AK_FORCE_INLINE int getPosOfLastPtNodeArrayHead() const {
+        return mReadingState.mPosOfThisPtNodeArrayHead;
+    }
+
+    bool traverseAllPtNodesInPostorderDepthFirstManner(TraversingEventListener *const listener);
+
+    bool traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
+            TraversingEventListener *const listener);
+
+    int getCodePointsAndProbabilityAndReturnCodePointCount(const int maxCodePointCount,
+            int *const outCodePoints, int *const outUnigramProbability);
+
+    int getTerminalPtNodePositionOfWord(const int *const inWord, const int length,
+            const bool forceLowerCaseSearch);
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(DynamicPtReadingHelper);
+
+    // This class encapsulates the reading state of a position in the dictionary. It points at a
+    // specific PtNode in the dictionary.
+    class PtNodeReadingState {
+     public:
+        // Note that copy constructor and assignment operator are used for this class to use
+        // std::vector.
+        PtNodeReadingState() : mPos(NOT_A_DICT_POS), mRemainingPtNodeCountInThisArray(0),
+                mTotalCodePointCountSinceInitialization(0), mTotalPtNodeIndexInThisArrayChain(0),
+                mPtNodeArrayIndexInThisArrayChain(0), mPosOfLastForwardLinkField(NOT_A_DICT_POS),
+                mPosOfThisPtNodeArrayHead(NOT_A_DICT_POS) {}
+
+        int mPos;
+        // Remaining node count in the current array.
+        int mRemainingPtNodeCountInThisArray;
+        int mTotalCodePointCountSinceInitialization;
+        // Counter of PtNodes used to avoid infinite loops caused by broken or malicious links.
+        int mTotalPtNodeIndexInThisArrayChain;
+        // Counter of PtNode arrays used to avoid infinite loops caused by cyclic links of empty
+        // PtNode arrays.
+        int mPtNodeArrayIndexInThisArrayChain;
+        int mPosOfLastForwardLinkField;
+        int mPosOfThisPtNodeArrayHead;
+    };
+
+    static const int MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP;
+    static const int MAX_PT_NODE_ARRAY_COUNT_TO_AVOID_INFINITE_LOOP;
+    static const size_t MAX_READING_STATE_STACK_SIZE;
+
+    // TODO: Introduce error code to track what caused the error.
+    bool mIsError;
+    PtNodeReadingState mReadingState;
+    const BufferWithExtendableBuffer *const mBuffer;
+    const PtNodeReader *const mPtNodeReader;
+    std::vector<PtNodeReadingState> mReadingStateStack;
+
+    void nextPtNodeArray();
+
+    void followForwardLink();
+
+    AK_FORCE_INLINE void pushReadingStateToStack() {
+        if (mReadingStateStack.size() > MAX_READING_STATE_STACK_SIZE) {
+            AKLOGI("Reading state stack overflow. Max size: %zd", MAX_READING_STATE_STACK_SIZE);
+            ASSERT(false);
+            mIsError = true;
+            mReadingState.mPos = NOT_A_DICT_POS;
+        } else {
+            mReadingStateStack.push_back(mReadingState);
+        }
+    }
+
+    AK_FORCE_INLINE void popReadingStateFromStack() {
+        if (mReadingStateStack.empty()) {
+            mReadingState.mPos = NOT_A_DICT_POS;
+        } else {
+            mReadingState = mReadingStateStack.back();
+            mReadingStateStack.pop_back();
+        }
+    }
+};
+} // namespace latinime
+#endif /* LATINIME_DYNAMIC_PT_READING_HELPER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp
similarity index 64%
rename from native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp
rename to native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp
index d68446d..3586b50 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp
@@ -14,38 +14,38 @@
  * limitations under the License.
  */
 
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
 
 #include "defines.h"
 #include "suggest/policyimpl/dictionary/utils/byte_array_utils.h"
 
 namespace latinime {
 
-typedef DynamicPatriciaTrieReadingUtils DptReadingUtils;
-
-const DptReadingUtils::NodeFlags DptReadingUtils::MASK_MOVED = 0xC0;
-const DptReadingUtils::NodeFlags DptReadingUtils::FLAG_IS_NOT_MOVED = 0xC0;
-const DptReadingUtils::NodeFlags DptReadingUtils::FLAG_IS_MOVED = 0x40;
-const DptReadingUtils::NodeFlags DptReadingUtils::FLAG_IS_DELETED = 0x80;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::MASK_MOVED = 0xC0;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_NOT_MOVED = 0xC0;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_MOVED = 0x40;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_DELETED = 0x80;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_WILL_BECOME_NON_TERMINAL = 0x00;
 
 // TODO: Make DICT_OFFSET_ZERO_OFFSET = 0.
 // Currently, DICT_OFFSET_INVALID is 0 in Java side but offset can be 0 during GC. So, the maximum
 // value of offsets, which is 0x7FFFFF is used to represent 0 offset.
-const int DptReadingUtils::DICT_OFFSET_INVALID = 0;
-const int DptReadingUtils::DICT_OFFSET_ZERO_OFFSET = 0x7FFFFF;
+const int DynamicPtReadingUtils::DICT_OFFSET_INVALID = 0;
+const int DynamicPtReadingUtils::DICT_OFFSET_ZERO_OFFSET = 0x7FFFFF;
 
-/* static */ int DptReadingUtils::getForwardLinkPosition(const uint8_t *const buffer,
+/* static */ int DynamicPtReadingUtils::getForwardLinkPosition(const uint8_t *const buffer,
         const int pos) {
     int linkAddressPos = pos;
     return ByteArrayUtils::readSint24AndAdvancePosition(buffer, &linkAddressPos);
 }
 
-/* static */ int DptReadingUtils::getParentPtNodePosOffsetAndAdvancePosition(
+/* static */ int DynamicPtReadingUtils::getParentPtNodePosOffsetAndAdvancePosition(
         const uint8_t *const buffer, int *const pos) {
     return ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
 }
 
-/* static */ int DptReadingUtils::getParentPtNodePos(const int parentOffset, const int ptNodePos) {
+/* static */ int DynamicPtReadingUtils::getParentPtNodePos(const int parentOffset,
+        const int ptNodePos) {
     if (parentOffset == DICT_OFFSET_INVALID) {
         return NOT_A_DICT_POS;
     } else if (parentOffset == DICT_OFFSET_ZERO_OFFSET) {
@@ -55,7 +55,7 @@
     }
 }
 
-/* static */ int DptReadingUtils::readChildrenPositionAndAdvancePosition(
+/* static */ int DynamicPtReadingUtils::readChildrenPositionAndAdvancePosition(
         const uint8_t *const buffer, int *const pos) {
     const int base = *pos;
     const int offset = ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h
similarity index 72%
rename from native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h
rename to native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h
index 67c3cc5..89ae12c 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_READING_UTILS_H
-#define LATINIME_DYNAMIC_PATRICIA_TRIE_READING_UTILS_H
+#ifndef LATINIME_DYNAMIC_PT_READING_UTILS_H
+#define LATINIME_DYNAMIC_PT_READING_UTILS_H
 
 #include <stdint.h>
 
@@ -23,7 +23,7 @@
 
 namespace latinime {
 
-class DynamicPatriciaTrieReadingUtils {
+class DynamicPtReadingUtils {
  public:
     typedef uint8_t NodeFlags;
 
@@ -54,22 +54,30 @@
         return FLAG_IS_DELETED == (MASK_MOVED & flags);
     }
 
+    static AK_FORCE_INLINE bool willBecomeNonTerminal(const NodeFlags flags) {
+        return FLAG_WILL_BECOME_NON_TERMINAL == (MASK_MOVED & flags);
+    }
+
     static AK_FORCE_INLINE NodeFlags updateAndGetFlags(const NodeFlags originalFlags,
-            const bool isMoved, const bool isDeleted) {
+            const bool isMoved, const bool isDeleted, const bool willBecomeNonTerminal) {
         NodeFlags flags = originalFlags;
+        flags = willBecomeNonTerminal ?
+                ((flags & (~MASK_MOVED)) | FLAG_WILL_BECOME_NON_TERMINAL) : flags;
         flags = isMoved ? ((flags & (~MASK_MOVED)) | FLAG_IS_MOVED) : flags;
         flags = isDeleted ? ((flags & (~MASK_MOVED)) | FLAG_IS_DELETED) : flags;
-        flags = (!isMoved && !isDeleted) ? ((flags & (~MASK_MOVED)) | FLAG_IS_NOT_MOVED) : flags;
+        flags = (!isMoved && !isDeleted && !willBecomeNonTerminal) ?
+                ((flags & (~MASK_MOVED)) | FLAG_IS_NOT_MOVED) : flags;
         return flags;
     }
 
  private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieReadingUtils);
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPtReadingUtils);
 
     static const NodeFlags MASK_MOVED;
     static const NodeFlags FLAG_IS_NOT_MOVED;
     static const NodeFlags FLAG_IS_MOVED;
     static const NodeFlags FLAG_IS_DELETED;
+    static const NodeFlags FLAG_WILL_BECOME_NON_TERMINAL;
 };
 } // namespace latinime
-#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_READING_UTILS_H */
+#endif /* LATINIME_DYNAMIC_PT_READING_UTILS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.cpp
new file mode 100644
index 0000000..2457b49
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.cpp
@@ -0,0 +1,294 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.h"
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_reader.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+const int DynamicPtUpdatingHelper::CHILDREN_POSITION_FIELD_SIZE = 3;
+
+bool DynamicPtUpdatingHelper::addUnigramWord(
+        DynamicPtReadingHelper *const readingHelper,
+        const int *const wordCodePoints, const int codePointCount, const int probability,
+        const bool isNotAWord, const bool isBlacklisted, const int timestamp,
+        bool *const outAddedNewUnigram) {
+    int parentPos = NOT_A_DICT_POS;
+    while (!readingHelper->isEnd()) {
+        const PtNodeParams ptNodeParams(readingHelper->getPtNodeParams());
+        if (!ptNodeParams.isValid()) {
+            break;
+        }
+        const int matchedCodePointCount = readingHelper->getPrevTotalCodePointCount();
+        if (!readingHelper->isMatchedCodePoint(ptNodeParams, 0 /* index */,
+                wordCodePoints[matchedCodePointCount])) {
+            // The first code point is different from target code point. Skip this node and read
+            // the next sibling node.
+            readingHelper->readNextSiblingNode(ptNodeParams);
+            continue;
+        }
+        // Check following merged node code points.
+        const int nodeCodePointCount = ptNodeParams.getCodePointCount();
+        for (int j = 1; j < nodeCodePointCount; ++j) {
+            const int nextIndex = matchedCodePointCount + j;
+            if (nextIndex >= codePointCount || !readingHelper->isMatchedCodePoint(ptNodeParams, j,
+                    wordCodePoints[matchedCodePointCount + j])) {
+                *outAddedNewUnigram = true;
+                return reallocatePtNodeAndAddNewPtNodes(&ptNodeParams, j, isNotAWord, isBlacklisted,
+                        probability, timestamp, wordCodePoints + matchedCodePointCount,
+                        codePointCount - matchedCodePointCount);
+            }
+        }
+        // All characters are matched.
+        if (codePointCount == readingHelper->getTotalCodePointCount(ptNodeParams)) {
+            return setPtNodeProbability(&ptNodeParams, isNotAWord, isBlacklisted, probability,
+                    timestamp, outAddedNewUnigram);
+        }
+        if (!ptNodeParams.hasChildren()) {
+            *outAddedNewUnigram = true;
+            return createChildrenPtNodeArrayAndAChildPtNode(&ptNodeParams,
+                    isNotAWord, isBlacklisted, probability, timestamp,
+                    wordCodePoints + readingHelper->getTotalCodePointCount(ptNodeParams),
+                    codePointCount - readingHelper->getTotalCodePointCount(ptNodeParams));
+        }
+        // Advance to the children nodes.
+        parentPos = ptNodeParams.getHeadPos();
+        readingHelper->readChildNode(ptNodeParams);
+    }
+    if (readingHelper->isError()) {
+        // The dictionary is invalid.
+        return false;
+    }
+    int pos = readingHelper->getPosOfLastForwardLinkField();
+    *outAddedNewUnigram = true;
+    return createAndInsertNodeIntoPtNodeArray(parentPos,
+            wordCodePoints + readingHelper->getPrevTotalCodePointCount(),
+            codePointCount - readingHelper->getPrevTotalCodePointCount(),
+            isNotAWord, isBlacklisted, probability, timestamp, &pos);
+}
+
+bool DynamicPtUpdatingHelper::addBigramWords(const int word0Pos, const int word1Pos,
+        const int probability, const int timestamp, bool *const outAddedNewBigram) {
+    const PtNodeParams sourcePtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word0Pos));
+    const PtNodeParams targetPtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word1Pos));
+    return mPtNodeWriter->addNewBigramEntry(&sourcePtNodeParams, &targetPtNodeParams, probability,
+            timestamp, outAddedNewBigram);
+}
+
+// Remove a bigram relation from word0Pos to word1Pos.
+bool DynamicPtUpdatingHelper::removeBigramWords(const int word0Pos, const int word1Pos) {
+    const PtNodeParams sourcePtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word0Pos));
+    const PtNodeParams targetPtNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(word1Pos));
+    return mPtNodeWriter->removeBigramEntry(&sourcePtNodeParams, &targetPtNodeParams);
+}
+
+bool DynamicPtUpdatingHelper::addShortcutTarget(const int wordPos,
+        const int *const targetCodePoints, const int targetCodePointCount,
+        const int shortcutProbability) {
+    const PtNodeParams ptNodeParams(mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(wordPos));
+    return mPtNodeWriter->addShortcutTarget(&ptNodeParams, targetCodePoints, targetCodePointCount,
+            shortcutProbability);
+}
+
+bool DynamicPtUpdatingHelper::createAndInsertNodeIntoPtNodeArray(const int parentPos,
+        const int *const nodeCodePoints, const int nodeCodePointCount,
+        const bool isNotAWord, const bool isBlacklisted, const int probability,
+        const int timestamp,  int *const forwardLinkFieldPos) {
+    const int newPtNodeArrayPos = mBuffer->getTailPosition();
+    if (!DynamicPtWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
+            newPtNodeArrayPos, forwardLinkFieldPos)) {
+        return false;
+    }
+    return createNewPtNodeArrayWithAChildPtNode(parentPos, nodeCodePoints, nodeCodePointCount,
+            isNotAWord, isBlacklisted, probability, timestamp);
+}
+
+bool DynamicPtUpdatingHelper::setPtNodeProbability(
+        const PtNodeParams *const originalPtNodeParams, const bool isNotAWord,
+        const bool isBlacklisted, const int probability, const int timestamp,
+        bool *const outAddedNewUnigram) {
+    if (originalPtNodeParams->isTerminal()) {
+        // Overwrites the probability.
+        *outAddedNewUnigram = false;
+        return mPtNodeWriter->updatePtNodeProbability(originalPtNodeParams, probability, timestamp);
+    } else {
+        // Make the node terminal and write the probability.
+        *outAddedNewUnigram = true;
+        const int movedPos = mBuffer->getTailPosition();
+        int writingPos = movedPos;
+        const PtNodeParams ptNodeParamsToWrite(getUpdatedPtNodeParams(originalPtNodeParams,
+                isNotAWord, isBlacklisted, true /* isTerminal */,
+                originalPtNodeParams->getParentPos(), originalPtNodeParams->getCodePointCount(),
+                originalPtNodeParams->getCodePoints(), probability));
+        if (!mPtNodeWriter->writeNewTerminalPtNodeAndAdvancePosition(&ptNodeParamsToWrite,
+                timestamp, &writingPos)) {
+            return false;
+        }
+        if (!mPtNodeWriter->markPtNodeAsMoved(originalPtNodeParams, movedPos, movedPos)) {
+            return false;
+        }
+    }
+    return true;
+}
+
+bool DynamicPtUpdatingHelper::createChildrenPtNodeArrayAndAChildPtNode(
+        const PtNodeParams *const parentPtNodeParams, const bool isNotAWord,
+        const bool isBlacklisted, const int probability, const int timestamp,
+        const int *const codePoints, const int codePointCount) {
+    const int newPtNodeArrayPos = mBuffer->getTailPosition();
+    if (!mPtNodeWriter->updateChildrenPosition(parentPtNodeParams, newPtNodeArrayPos)) {
+        return false;
+    }
+    return createNewPtNodeArrayWithAChildPtNode(parentPtNodeParams->getHeadPos(), codePoints,
+            codePointCount, isNotAWord, isBlacklisted, probability, timestamp);
+}
+
+bool DynamicPtUpdatingHelper::createNewPtNodeArrayWithAChildPtNode(
+        const int parentPtNodePos, const int *const nodeCodePoints, const int nodeCodePointCount,
+        const bool isNotAWord, const bool isBlacklisted, const int probability,
+        const int timestamp) {
+    int writingPos = mBuffer->getTailPosition();
+    if (!DynamicPtWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
+            1 /* arraySize */, &writingPos)) {
+        return false;
+    }
+    const PtNodeParams ptNodeParamsToWrite(getPtNodeParamsForNewPtNode(
+            isNotAWord, isBlacklisted, true /* isTerminal */,
+            parentPtNodePos, nodeCodePointCount, nodeCodePoints, probability));
+    if (!mPtNodeWriter->writeNewTerminalPtNodeAndAdvancePosition(&ptNodeParamsToWrite, timestamp,
+            &writingPos)) {
+        return false;
+    }
+    if (!DynamicPtWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
+            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
+        return false;
+    }
+    return true;
+}
+
+// Returns whether the dictionary updating was succeeded or not.
+bool DynamicPtUpdatingHelper::reallocatePtNodeAndAddNewPtNodes(
+        const PtNodeParams *const reallocatingPtNodeParams, const int overlappingCodePointCount,
+        const bool isNotAWord, const bool isBlacklisted, const int probabilityOfNewPtNode,
+        const int timestamp, const int *const newNodeCodePoints, const int newNodeCodePointCount) {
+    // When addsExtraChild is true, split the reallocating PtNode and add new child.
+    // Reallocating PtNode: abcde, newNode: abcxy.
+    // abc (1st, not terminal) __ de (2nd)
+    //                         \_ xy (extra child, terminal)
+    // Otherwise, this method makes 1st part terminal and write probabilityOfNewPtNode.
+    // Reallocating PtNode: abcde, newNode: abc.
+    // abc (1st, terminal) __ de (2nd)
+    const bool addsExtraChild = newNodeCodePointCount > overlappingCodePointCount;
+    const int firstPartOfReallocatedPtNodePos = mBuffer->getTailPosition();
+    int writingPos = firstPartOfReallocatedPtNodePos;
+    // Write the 1st part of the reallocating node. The children position will be updated later
+    // with actual children position.
+    if (addsExtraChild) {
+        const PtNodeParams ptNodeParamsToWrite(getPtNodeParamsForNewPtNode(
+                false /* isNotAWord */, false /* isBlacklisted */, false /* isTerminal */,
+                reallocatingPtNodeParams->getParentPos(), overlappingCodePointCount,
+                reallocatingPtNodeParams->getCodePoints(), NOT_A_PROBABILITY));
+        if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&ptNodeParamsToWrite, &writingPos)) {
+            return false;
+        }
+    } else {
+        const PtNodeParams ptNodeParamsToWrite(getPtNodeParamsForNewPtNode(
+                isNotAWord, isBlacklisted, true /* isTerminal */,
+                reallocatingPtNodeParams->getParentPos(), overlappingCodePointCount,
+                reallocatingPtNodeParams->getCodePoints(), probabilityOfNewPtNode));
+        if (!mPtNodeWriter->writeNewTerminalPtNodeAndAdvancePosition(&ptNodeParamsToWrite,
+                timestamp, &writingPos)) {
+            return false;
+        }
+    }
+    const int actualChildrenPos = writingPos;
+    // Create new children PtNode array.
+    const size_t newPtNodeCount = addsExtraChild ? 2 : 1;
+    if (!DynamicPtWritingUtils::writePtNodeArraySizeAndAdvancePosition(mBuffer,
+            newPtNodeCount, &writingPos)) {
+        return false;
+    }
+    // Write the 2nd part of the reallocating node.
+    const int secondPartOfReallocatedPtNodePos = writingPos;
+    const PtNodeParams childPartPtNodeParams(getUpdatedPtNodeParams(reallocatingPtNodeParams,
+            reallocatingPtNodeParams->isNotAWord(), reallocatingPtNodeParams->isBlacklisted(),
+            reallocatingPtNodeParams->isTerminal(), firstPartOfReallocatedPtNodePos,
+            reallocatingPtNodeParams->getCodePointCount() - overlappingCodePointCount,
+            reallocatingPtNodeParams->getCodePoints() + overlappingCodePointCount,
+            reallocatingPtNodeParams->getProbability()));
+    if (!mPtNodeWriter->writePtNodeAndAdvancePosition(&childPartPtNodeParams, &writingPos)) {
+        return false;
+    }
+    if (addsExtraChild) {
+        const PtNodeParams extraChildPtNodeParams(getPtNodeParamsForNewPtNode(
+                isNotAWord, isBlacklisted, true /* isTerminal */,
+                firstPartOfReallocatedPtNodePos, newNodeCodePointCount - overlappingCodePointCount,
+                newNodeCodePoints + overlappingCodePointCount, probabilityOfNewPtNode));
+        if (!mPtNodeWriter->writeNewTerminalPtNodeAndAdvancePosition(&extraChildPtNodeParams,
+                timestamp, &writingPos)) {
+            return false;
+        }
+    }
+    if (!DynamicPtWritingUtils::writeForwardLinkPositionAndAdvancePosition(mBuffer,
+            NOT_A_DICT_POS /* forwardLinkPos */, &writingPos)) {
+        return false;
+    }
+    // Update original reallocating PtNode as moved.
+    if (!mPtNodeWriter->markPtNodeAsMoved(reallocatingPtNodeParams, firstPartOfReallocatedPtNodePos,
+            secondPartOfReallocatedPtNodePos)) {
+        return false;
+    }
+    // Load node info. Information of the 1st part will be fetched.
+    const PtNodeParams ptNodeParams(
+            mPtNodeReader->fetchNodeInfoInBufferFromPtNodePos(firstPartOfReallocatedPtNodePos));
+    // Update children position.
+    return mPtNodeWriter->updateChildrenPosition(&ptNodeParams, actualChildrenPos);
+}
+
+const PtNodeParams DynamicPtUpdatingHelper::getUpdatedPtNodeParams(
+        const PtNodeParams *const originalPtNodeParams, const bool isNotAWord,
+        const bool isBlacklisted, const bool isTerminal, const int parentPos,
+        const int codePointCount, const int *const codePoints, const int probability) const {
+    const PatriciaTrieReadingUtils::NodeFlags flags = PatriciaTrieReadingUtils::createAndGetFlags(
+            isBlacklisted, isNotAWord, isTerminal, originalPtNodeParams->hasShortcutTargets(),
+            originalPtNodeParams->hasBigrams(), codePointCount > 1 /* hasMultipleChars */,
+            CHILDREN_POSITION_FIELD_SIZE);
+    return PtNodeParams(originalPtNodeParams, flags, parentPos, codePointCount, codePoints,
+            probability);
+}
+
+const PtNodeParams DynamicPtUpdatingHelper::getPtNodeParamsForNewPtNode(
+        const bool isNotAWord, const bool isBlacklisted, const bool isTerminal,
+        const int parentPos, const int codePointCount, const int *const codePoints,
+        const int probability) const {
+    const PatriciaTrieReadingUtils::NodeFlags flags = PatriciaTrieReadingUtils::createAndGetFlags(
+            isBlacklisted, isNotAWord, isTerminal, false /* hasShortcutTargets */,
+            false /* hasBigrams */, codePointCount > 1 /* hasMultipleChars */,
+            CHILDREN_POSITION_FIELD_SIZE);
+    return PtNodeParams(flags, parentPos, codePointCount, codePoints, probability);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.h
new file mode 100644
index 0000000..71f4730
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_DYNAMIC_PT_UPDATING_HELPER_H
+#define LATINIME_DYNAMIC_PT_UPDATING_HELPER_H
+
+#include <stdint.h>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+#include "utils/hash_map_compat.h"
+
+namespace latinime {
+
+class BufferWithExtendableBuffer;
+class DynamicPtReadingHelper;
+class PtNodeReader;
+class PtNodeWriter;
+
+class DynamicPtUpdatingHelper {
+ public:
+    DynamicPtUpdatingHelper(BufferWithExtendableBuffer *const buffer,
+            const PtNodeReader *const ptNodeReader, PtNodeWriter *const ptNodeWriter)
+            : mBuffer(buffer), mPtNodeReader(ptNodeReader), mPtNodeWriter(ptNodeWriter) {}
+
+    ~DynamicPtUpdatingHelper() {}
+
+    // Add a word to the dictionary. If the word already exists, update the probability.
+    bool addUnigramWord(DynamicPtReadingHelper *const readingHelper,
+            const int *const wordCodePoints, const int codePointCount, const int probability,
+            const bool isNotAWord, const bool isBlacklisted, const int timestamp,
+            bool *const outAddedNewUnigram);
+
+    // Add a bigram relation from word0Pos to word1Pos.
+    bool addBigramWords(const int word0Pos, const int word1Pos, const int probability,
+            const int timestamp, bool *const outAddedNewBigram);
+
+    // Remove a bigram relation from word0Pos to word1Pos.
+    bool removeBigramWords(const int word0Pos, const int word1Pos);
+
+    // Add a shortcut target.
+    bool addShortcutTarget(const int wordPos, const int *const targetCodePoints,
+            const int targetCodePointCount, const int shortcutProbability);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPtUpdatingHelper);
+
+    static const int CHILDREN_POSITION_FIELD_SIZE;
+
+    BufferWithExtendableBuffer *const mBuffer;
+    const PtNodeReader *const mPtNodeReader;
+    PtNodeWriter *const mPtNodeWriter;
+
+    bool createAndInsertNodeIntoPtNodeArray(const int parentPos, const int *const nodeCodePoints,
+            const int nodeCodePointCount, const bool isNotAWord, const bool isBlacklisted,
+            const int probability, const int timestamp, int *const forwardLinkFieldPos);
+
+    bool setPtNodeProbability(const PtNodeParams *const originalPtNodeParams, const bool isNotAWord,
+            const bool isBlacklisted, const int probability, const int timestamp,
+            bool *const outAddedNewUnigram);
+
+    bool createChildrenPtNodeArrayAndAChildPtNode(const PtNodeParams *const parentPtNodeParams,
+            const bool isNotAWord, const bool isBlacklisted, const int probability,
+            const int timestamp, const int *const codePoints, const int codePointCount);
+
+    bool createNewPtNodeArrayWithAChildPtNode(const int parentPos, const int *const nodeCodePoints,
+            const int nodeCodePointCount, const bool isNotAWord, const bool isBlacklisted,
+            const int probability, const int timestamp);
+
+    bool reallocatePtNodeAndAddNewPtNodes(
+            const PtNodeParams *const reallocatingPtNodeParams, const int overlappingCodePointCount,
+            const bool isNotAWord, const bool isBlacklisted, const int probabilityOfNewPtNode,
+            const int timestamp, const int *const newNodeCodePoints,
+            const int newNodeCodePointCount);
+
+    const PtNodeParams getUpdatedPtNodeParams(const PtNodeParams *const originalPtNodeParams,
+            const bool isNotAWord, const bool isBlacklisted, const bool isTerminal,
+            const int parentPos, const int codePointCount,
+            const int *const codePoints, const int probability) const;
+
+    const PtNodeParams getPtNodeParamsForNewPtNode(const bool isNotAWord, const bool isBlacklisted,
+            const bool isTerminal, const int parentPos,
+            const int codePointCount, const int *const codePoints, const int probability) const;
+};
+} // namespace latinime
+#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_UPDATING_HELPER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.cpp
similarity index 61%
rename from native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.cpp
rename to native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.cpp
index 30ff10c..ebbdc2e 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h"
 
 #include <cstddef>
 #include <cstdlib>
@@ -24,19 +24,18 @@
 
 namespace latinime {
 
-const size_t DynamicPatriciaTrieWritingUtils::MAX_PTNODE_ARRAY_SIZE_TO_USE_SMALL_SIZE_FIELD = 0x7F;
-const size_t DynamicPatriciaTrieWritingUtils::MAX_PTNODE_ARRAY_SIZE = 0x7FFF;
-const int DynamicPatriciaTrieWritingUtils::SMALL_PTNODE_ARRAY_SIZE_FIELD_SIZE = 1;
-const int DynamicPatriciaTrieWritingUtils::LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE = 2;
-const int DynamicPatriciaTrieWritingUtils::LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG = 0x8000;
-const int DynamicPatriciaTrieWritingUtils::DICT_OFFSET_FIELD_SIZE = 3;
-const int DynamicPatriciaTrieWritingUtils::MAX_DICT_OFFSET_VALUE = 0x7FFFFF;
-const int DynamicPatriciaTrieWritingUtils::MIN_DICT_OFFSET_VALUE = -0x7FFFFF;
-const int DynamicPatriciaTrieWritingUtils::DICT_OFFSET_NEGATIVE_FLAG = 0x800000;
-const int DynamicPatriciaTrieWritingUtils::PROBABILITY_FIELD_SIZE = 1;
-const int DynamicPatriciaTrieWritingUtils::NODE_FLAG_FIELD_SIZE = 1;
+const size_t DynamicPtWritingUtils::MAX_PTNODE_ARRAY_SIZE_TO_USE_SMALL_SIZE_FIELD = 0x7F;
+const size_t DynamicPtWritingUtils::MAX_PTNODE_ARRAY_SIZE = 0x7FFF;
+const int DynamicPtWritingUtils::SMALL_PTNODE_ARRAY_SIZE_FIELD_SIZE = 1;
+const int DynamicPtWritingUtils::LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE = 2;
+const int DynamicPtWritingUtils::LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG = 0x8000;
+const int DynamicPtWritingUtils::DICT_OFFSET_FIELD_SIZE = 3;
+const int DynamicPtWritingUtils::MAX_DICT_OFFSET_VALUE = 0x7FFFFF;
+const int DynamicPtWritingUtils::MIN_DICT_OFFSET_VALUE = -0x7FFFFF;
+const int DynamicPtWritingUtils::DICT_OFFSET_NEGATIVE_FLAG = 0x800000;
+const int DynamicPtWritingUtils::NODE_FLAG_FIELD_SIZE = 1;
 
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeEmptyDictionary(
+/* static */ bool DynamicPtWritingUtils::writeEmptyDictionary(
         BufferWithExtendableBuffer *const buffer, const int rootPos) {
     int writingPos = rootPos;
     if (!writePtNodeArraySizeAndAdvancePosition(buffer, 0 /* arraySize */, &writingPos)) {
@@ -46,13 +45,13 @@
             &writingPos);
 }
 
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(
+/* static */ bool DynamicPtWritingUtils::writeForwardLinkPositionAndAdvancePosition(
         BufferWithExtendableBuffer *const buffer, const int forwardLinkPos,
         int *const forwardLinkFieldPos) {
     return writeDictOffset(buffer, forwardLinkPos, (*forwardLinkFieldPos), forwardLinkFieldPos);
 }
 
-/* static */ bool DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(
+/* static */ bool DynamicPtWritingUtils::writePtNodeArraySizeAndAdvancePosition(
         BufferWithExtendableBuffer *const buffer, const size_t arraySize,
         int *const arraySizeFieldPos) {
     // Currently, all array size field to be created has LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE to
@@ -74,20 +73,20 @@
     }
 }
 
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeFlagsAndAdvancePosition(
+/* static */ bool DynamicPtWritingUtils::writeFlagsAndAdvancePosition(
         BufferWithExtendableBuffer *const buffer,
-        const DynamicPatriciaTrieReadingUtils::NodeFlags nodeFlags, int *const nodeFlagsFieldPos) {
+        const DynamicPtReadingUtils::NodeFlags nodeFlags, int *const nodeFlagsFieldPos) {
     return buffer->writeUintAndAdvancePosition(nodeFlags, NODE_FLAG_FIELD_SIZE, nodeFlagsFieldPos);
 }
 
 // Note that parentOffset is offset from node's head position.
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeParentPosOffsetAndAdvancePosition(
+/* static */ bool DynamicPtWritingUtils::writeParentPosOffsetAndAdvancePosition(
         BufferWithExtendableBuffer *const buffer, const int parentPos, const int basePos,
         int *const parentPosFieldPos) {
     return writeDictOffset(buffer, parentPos, basePos, parentPosFieldPos);
 }
 
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeCodePointsAndAdvancePosition(
+/* static */ bool DynamicPtWritingUtils::writeCodePointsAndAdvancePosition(
         BufferWithExtendableBuffer *const buffer, const int *const codePoints,
         const int codePointCount, int *const codePointFieldPos) {
     if (codePointCount <= 0) {
@@ -101,34 +100,20 @@
             hasMultipleCodePoints, codePointFieldPos);
 }
 
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeProbabilityAndAdvancePosition(
-        BufferWithExtendableBuffer *const buffer, const int probability,
-        int *const probabilityFieldPos) {
-    if (probability < 0 || probability > MAX_PROBABILITY) {
-        AKLOGI("probability cannot be written because the probability is invalid: %d",
-                probability);
-        ASSERT(false);
-        return false;
-    }
-    return buffer->writeUintAndAdvancePosition(probability, PROBABILITY_FIELD_SIZE,
-            probabilityFieldPos);
-}
-
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(
+/* static */ bool DynamicPtWritingUtils::writeChildrenPositionAndAdvancePosition(
         BufferWithExtendableBuffer *const buffer, const int childrenPosition,
         int *const childrenPositionFieldPos) {
     return writeDictOffset(buffer, childrenPosition, (*childrenPositionFieldPos),
             childrenPositionFieldPos);
 }
 
-/* static */ bool DynamicPatriciaTrieWritingUtils::writeDictOffset(
-        BufferWithExtendableBuffer *const buffer, const int targetPos, const int basePos,
-        int *const offsetFieldPos) {
+/* static */ bool DynamicPtWritingUtils::writeDictOffset(BufferWithExtendableBuffer *const buffer,
+        const int targetPos, const int basePos, int *const offsetFieldPos) {
     int offset = targetPos - basePos;
     if (targetPos == NOT_A_DICT_POS) {
-        offset = DynamicPatriciaTrieReadingUtils::DICT_OFFSET_INVALID;
+        offset = DynamicPtReadingUtils::DICT_OFFSET_INVALID;
     } else if (offset == 0) {
-        offset = DynamicPatriciaTrieReadingUtils::DICT_OFFSET_ZERO_OFFSET;
+        offset = DynamicPtReadingUtils::DICT_OFFSET_ZERO_OFFSET;
     }
     if (offset > MAX_DICT_OFFSET_VALUE || offset < MIN_DICT_OFFSET_VALUE) {
         AKLOGI("offset cannot be written because the offset is too large or too small: %d",
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h
similarity index 78%
rename from native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h
rename to native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h
index af76bc6..362fbd1 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h
@@ -14,19 +14,19 @@
  * limitations under the License.
  */
 
-#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_UTILS_H
-#define LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_UTILS_H
+#ifndef LATINIME_DYNAMIC_PT_WRITING_UTILS_H
+#define LATINIME_DYNAMIC_PT_WRITING_UTILS_H
 
 #include <cstddef>
 
 #include "defines.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
 
 namespace latinime {
 
 class BufferWithExtendableBuffer;
 
-class DynamicPatriciaTrieWritingUtils {
+class DynamicPtWritingUtils {
  public:
     static const int NODE_FLAG_FIELD_SIZE;
 
@@ -39,8 +39,15 @@
     static bool writePtNodeArraySizeAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
             const size_t arraySize, int *const arraySizeFieldPos);
 
+    static bool writeFlags(BufferWithExtendableBuffer *const buffer,
+            const DynamicPtReadingUtils::NodeFlags nodeFlags,
+            const int nodeFlagsFieldPos) {
+        int writingPos = nodeFlagsFieldPos;
+        return writeFlagsAndAdvancePosition(buffer, nodeFlags, &writingPos);
+    }
+
     static bool writeFlagsAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
-            const DynamicPatriciaTrieReadingUtils::NodeFlags nodeFlags,
+            const DynamicPtReadingUtils::NodeFlags nodeFlags,
             int *const nodeFlagsFieldPos);
 
     static bool writeParentPosOffsetAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
@@ -49,14 +56,11 @@
     static bool writeCodePointsAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
             const int *const codePoints, const int codePointCount, int *const codePointFieldPos);
 
-    static bool writeProbabilityAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
-            const int probability, int *const probabilityFieldPos);
-
     static bool writeChildrenPositionAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
             const int childrenPosition, int *const childrenPositionFieldPos);
 
  private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieWritingUtils);
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPtWritingUtils);
 
     static const size_t MAX_PTNODE_ARRAY_SIZE_TO_USE_SMALL_SIZE_FIELD;
     static const size_t MAX_PTNODE_ARRAY_SIZE;
@@ -67,10 +71,9 @@
     static const int MAX_DICT_OFFSET_VALUE;
     static const int MIN_DICT_OFFSET_VALUE;
     static const int DICT_OFFSET_NEGATIVE_FLAG;
-    static const int PROBABILITY_FIELD_SIZE;
 
     static bool writeDictOffset(BufferWithExtendableBuffer *const buffer, const int targetPos,
             const int basePos, int *const offsetFieldPos);
 };
 } // namespace latinime
-#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_UTILS_H */
+#endif /* LATINIME_DYNAMIC_PT_WRITING_UTILS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h
new file mode 100644
index 0000000..84731eb
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h
@@ -0,0 +1,229 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_PT_NODE_PARAMS_H
+#define LATINIME_PT_NODE_PARAMS_H
+
+#include <cstring>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+
+namespace latinime {
+
+// This class has information of a PtNode. This class is immutable.
+class PtNodeParams {
+ public:
+    // Invalid PtNode.
+    PtNodeParams() : mHeadPos(NOT_A_DICT_POS), mFlags(0), mParentPos(NOT_A_DICT_POS),
+            mCodePointCount(0), mCodePoints(), mTerminalIdFieldPos(NOT_A_DICT_POS),
+            mTerminalId(Ver4DictConstants::NOT_A_TERMINAL_ID), mProbabilityFieldPos(NOT_A_DICT_POS),
+            mProbability(NOT_A_PROBABILITY), mChildrenPosFieldPos(NOT_A_DICT_POS),
+            mChildrenPos(NOT_A_DICT_POS), mBigramLinkedNodePos(NOT_A_DICT_POS),
+            mShortcutPos(NOT_A_DICT_POS), mBigramPos(NOT_A_DICT_POS),
+            mSiblingPos(NOT_A_DICT_POS) {}
+
+    PtNodeParams(const PtNodeParams& ptNodeParams)
+            : mHeadPos(ptNodeParams.mHeadPos), mFlags(ptNodeParams.mFlags),
+              mParentPos(ptNodeParams.mParentPos), mCodePointCount(ptNodeParams.mCodePointCount),
+              mCodePoints(), mTerminalIdFieldPos(ptNodeParams.mTerminalIdFieldPos),
+              mTerminalId(ptNodeParams.mTerminalId),
+              mProbabilityFieldPos(ptNodeParams.mProbabilityFieldPos),
+              mProbability(ptNodeParams.mProbability),
+              mChildrenPosFieldPos(ptNodeParams.mChildrenPosFieldPos),
+              mChildrenPos(ptNodeParams.mChildrenPos),
+              mBigramLinkedNodePos(ptNodeParams.mBigramLinkedNodePos),
+              mShortcutPos(ptNodeParams.mShortcutPos), mBigramPos(ptNodeParams.mBigramPos),
+              mSiblingPos(ptNodeParams.mSiblingPos) {
+        memcpy(mCodePoints, ptNodeParams.getCodePoints(), sizeof(int) * mCodePointCount);
+    }
+
+    // PtNode with a terminal id.
+    PtNodeParams(const int headPos, const PatriciaTrieReadingUtils::NodeFlags flags,
+            const int parentPos, const int codePointCount, const int *const codePoints,
+            const int terminalIdFieldPos, const int terminalId, const int probability,
+            const int childrenPosFieldPos, const int childrenPos, const int siblingPos)
+            : mHeadPos(headPos), mFlags(flags), mParentPos(parentPos),
+              mCodePointCount(codePointCount), mCodePoints(),
+              mTerminalIdFieldPos(terminalIdFieldPos), mTerminalId(terminalId),
+              mProbabilityFieldPos(NOT_A_DICT_POS), mProbability(probability),
+              mChildrenPosFieldPos(childrenPosFieldPos), mChildrenPos(childrenPos),
+              mBigramLinkedNodePos(NOT_A_DICT_POS), mShortcutPos(terminalId),
+              mBigramPos(terminalId), mSiblingPos(siblingPos) {
+        memcpy(mCodePoints, codePoints, sizeof(int) * mCodePointCount);
+    }
+
+    // Construct new params by updating existing PtNode params.
+    PtNodeParams(const PtNodeParams *const ptNodeParams,
+            const PatriciaTrieReadingUtils::NodeFlags flags, const int parentPos,
+            const int codePointCount, const int *const codePoints, const int probability)
+            : mHeadPos(ptNodeParams->getHeadPos()), mFlags(flags), mParentPos(parentPos),
+              mCodePointCount(codePointCount), mCodePoints(),
+              mTerminalIdFieldPos(ptNodeParams->getTerminalIdFieldPos()),
+              mTerminalId(ptNodeParams->getTerminalId()),
+              mProbabilityFieldPos(ptNodeParams->getProbabilityFieldPos()),
+              mProbability(probability),
+              mChildrenPosFieldPos(ptNodeParams->getChildrenPosFieldPos()),
+              mChildrenPos(ptNodeParams->getChildrenPos()),
+              mBigramLinkedNodePos(ptNodeParams->getBigramLinkedNodePos()),
+              mShortcutPos(ptNodeParams->getShortcutPos()),
+              mBigramPos(ptNodeParams->getBigramsPos()),
+              mSiblingPos(ptNodeParams->getSiblingNodePos()) {
+        memcpy(mCodePoints, codePoints, sizeof(int) * mCodePointCount);
+    }
+
+    PtNodeParams(const PatriciaTrieReadingUtils::NodeFlags flags, const int parentPos,
+            const int codePointCount, const int *const codePoints, const int probability)
+            : mHeadPos(NOT_A_DICT_POS), mFlags(flags), mParentPos(parentPos),
+              mCodePointCount(codePointCount), mCodePoints(),
+              mTerminalIdFieldPos(NOT_A_DICT_POS),
+              mTerminalId(Ver4DictConstants::NOT_A_TERMINAL_ID),
+              mProbabilityFieldPos(NOT_A_DICT_POS), mProbability(probability),
+              mChildrenPosFieldPos(NOT_A_DICT_POS), mChildrenPos(NOT_A_DICT_POS),
+              mBigramLinkedNodePos(NOT_A_DICT_POS), mShortcutPos(NOT_A_DICT_POS),
+              mBigramPos(NOT_A_DICT_POS), mSiblingPos(NOT_A_DICT_POS) {
+        memcpy(mCodePoints, codePoints, sizeof(int) * mCodePointCount);
+    }
+
+    AK_FORCE_INLINE bool isValid() const {
+        return mCodePointCount > 0;
+    }
+
+    // Head position of the PtNode
+    AK_FORCE_INLINE int getHeadPos() const {
+        return mHeadPos;
+    }
+
+    // Flags
+    AK_FORCE_INLINE bool isDeleted() const {
+        return DynamicPtReadingUtils::isDeleted(mFlags);
+    }
+
+    AK_FORCE_INLINE bool willBecomeNonTerminal() const {
+        return DynamicPtReadingUtils::willBecomeNonTerminal(mFlags);
+    }
+
+    AK_FORCE_INLINE bool hasChildren() const {
+        return mChildrenPos != NOT_A_DICT_POS;
+    }
+
+    AK_FORCE_INLINE bool isTerminal() const {
+        return PatriciaTrieReadingUtils::isTerminal(mFlags);
+    }
+
+    AK_FORCE_INLINE bool isBlacklisted() const {
+        return PatriciaTrieReadingUtils::isBlacklisted(mFlags);
+    }
+
+    AK_FORCE_INLINE bool isNotAWord() const {
+        return PatriciaTrieReadingUtils::isNotAWord(mFlags);
+    }
+
+    AK_FORCE_INLINE bool hasBigrams() const {
+        return PatriciaTrieReadingUtils::hasBigrams(mFlags);
+    }
+
+    AK_FORCE_INLINE bool hasShortcutTargets() const {
+        return PatriciaTrieReadingUtils::hasShortcutTargets(mFlags);
+    }
+
+    // Parent node position
+    AK_FORCE_INLINE int getParentPos() const {
+        return mParentPos;
+    }
+
+    // Number of code points
+    AK_FORCE_INLINE uint8_t getCodePointCount() const {
+        return mCodePointCount;
+    }
+
+    AK_FORCE_INLINE const int *getCodePoints() const {
+        return mCodePoints;
+    }
+
+    // Probability
+    AK_FORCE_INLINE int getTerminalIdFieldPos() const {
+        return mTerminalIdFieldPos;
+    }
+
+    AK_FORCE_INLINE int getTerminalId() const {
+        return mTerminalId;
+    }
+
+    // Probability
+    AK_FORCE_INLINE int getProbabilityFieldPos() const {
+        return mProbabilityFieldPos;
+    }
+
+    AK_FORCE_INLINE int getProbability() const {
+        return mProbability;
+    }
+
+    // Children PtNode array position
+    AK_FORCE_INLINE int getChildrenPosFieldPos() const {
+        return mChildrenPosFieldPos;
+    }
+
+    AK_FORCE_INLINE int getChildrenPos() const {
+        return mChildrenPos;
+    }
+
+    // Bigram linked node position.
+    AK_FORCE_INLINE int getBigramLinkedNodePos() const {
+        return mBigramLinkedNodePos;
+    }
+
+    // Shortcutlist position
+    AK_FORCE_INLINE int getShortcutPos() const {
+        return mShortcutPos;
+    }
+
+    // Bigrams position
+    AK_FORCE_INLINE int getBigramsPos() const {
+        return mBigramPos;
+    }
+
+    // Sibling node position
+    AK_FORCE_INLINE int getSiblingNodePos() const {
+        return mSiblingPos;
+    }
+
+ private:
+    // This class have a public copy constructor to be used as a return value.
+
+    // Disallowing the assignment operator.
+    PtNodeParams &operator=(PtNodeParams &ptNodeParams);
+
+    const int mHeadPos;
+    const PatriciaTrieReadingUtils::NodeFlags mFlags;
+    const int mParentPos;
+    const uint8_t mCodePointCount;
+    int mCodePoints[MAX_WORD_LENGTH];
+    const int mTerminalIdFieldPos;
+    const int mTerminalId;
+    const int mProbabilityFieldPos;
+    const int mProbability;
+    const int mChildrenPosFieldPos;
+    const int mChildrenPos;
+    const int mBigramLinkedNodePos;
+    const int mShortcutPos;
+    const int mBigramPos;
+    const int mSiblingPos;
+};
+} // namespace latinime
+#endif /* LATINIME_PT_NODE_PARAMS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_reader.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_reader.h
new file mode 100644
index 0000000..c6b2a8b
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_reader.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_PT_NODE_READER_H
+#define LATINIME_PT_NODE_READER_H
+
+#include "defines.h"
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+
+namespace latinime {
+
+// Interface class used to read PtNode information.
+class PtNodeReader {
+ public:
+    virtual ~PtNodeReader() {}
+    virtual const PtNodeParams fetchNodeInfoInBufferFromPtNodePos(const int ptNodePos) const = 0;
+
+ protected:
+    PtNodeReader() {};
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(PtNodeReader);
+};
+} // namespace latinime
+#endif /* LATINIME_PT_NODE_READER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h
new file mode 100644
index 0000000..84dd687
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_PT_NODE_WRITER_H
+#define LATINIME_PT_NODE_WRITER_H
+
+#include "defines.h"
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+#include "utils/hash_map_compat.h"
+
+namespace latinime {
+
+// Interface class used to write PtNode information.
+class PtNodeWriter {
+ public:
+    typedef hash_map_compat<int, int> PtNodeArrayPositionRelocationMap;
+    typedef hash_map_compat<int, int> PtNodePositionRelocationMap;
+    struct DictPositionRelocationMap {
+     public:
+        DictPositionRelocationMap()
+                : mPtNodeArrayPositionRelocationMap(), mPtNodePositionRelocationMap() {}
+
+        PtNodeArrayPositionRelocationMap mPtNodeArrayPositionRelocationMap;
+        PtNodePositionRelocationMap mPtNodePositionRelocationMap;
+
+     private:
+        DISALLOW_COPY_AND_ASSIGN(DictPositionRelocationMap);
+    };
+
+    virtual ~PtNodeWriter() {}
+
+    virtual bool markPtNodeAsDeleted(const PtNodeParams *const toBeUpdatedPtNodeParams) = 0;
+
+    virtual bool markPtNodeAsMoved(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const int movedPos, const int bigramLinkedNodePos) = 0;
+
+    virtual bool markPtNodeAsWillBecomeNonTerminal(
+            const PtNodeParams *const toBeUpdatedPtNodeParams) = 0;
+
+    virtual bool updatePtNodeProbability(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const int probability, const int timestamp) = 0;
+
+    virtual bool updatePtNodeProbabilityAndGetNeedsToKeepPtNodeAfterGC(
+            const PtNodeParams *const toBeUpdatedPtNodeParams,
+            bool *const outNeedsToKeepPtNode) = 0;
+
+    virtual bool updateChildrenPosition(const PtNodeParams *const toBeUpdatedPtNodeParams,
+                const int newChildrenPosition) = 0;
+
+    virtual bool writePtNodeAndAdvancePosition(const PtNodeParams *const ptNodeParams,
+            int *const ptNodeWritingPos) = 0;
+
+    virtual bool writeNewTerminalPtNodeAndAdvancePosition(const PtNodeParams *const ptNodeParams,
+            const int timestamp, int *const ptNodeWritingPos) = 0;
+
+    virtual bool addNewBigramEntry(const PtNodeParams *const sourcePtNodeParams,
+            const PtNodeParams *const targetPtNodeParam, const int probability, const int timestamp,
+            bool *const outAddedNewBigram) = 0;
+
+    virtual bool removeBigramEntry(const PtNodeParams *const sourcePtNodeParams,
+            const PtNodeParams *const targetPtNodeParam) = 0;
+
+    virtual bool updateAllBigramEntriesAndDeleteUselessEntries(
+            const PtNodeParams *const sourcePtNodeParams, int *const outBigramEntryCount) = 0;
+
+    virtual bool updateAllPositionFields(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const DictPositionRelocationMap *const dictPositionRelocationMap,
+            int *const outBigramEntryCount) = 0;
+
+    virtual bool addShortcutTarget(const PtNodeParams *const ptNodeParams,
+            const int *const targetCodePoints, const int targetCodePointCount,
+            const int shortcutProbability) = 0;
+
+ protected:
+    PtNodeWriter() {};
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(PtNodeWriter);
+};
+} // namespace latinime
+#endif /* LATINIME_PT_NODE_WRITER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
similarity index 95%
rename from native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.cpp
rename to native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
index 8a84bd2..960c1b9 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
@@ -15,22 +15,22 @@
  */
 
 
-#include "suggest/policyimpl/dictionary/patricia_trie_policy.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h"
 
 #include "defines.h"
 #include "suggest/core/dicnode/dic_node.h"
 #include "suggest/core/dicnode/dic_node_vector.h"
-#include "suggest/policyimpl/dictionary/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
 #include "suggest/policyimpl/dictionary/utils/probability_utils.h"
 
 namespace latinime {
 
-void PatriciaTriePolicy::createAndGetAllChildNodes(const DicNode *const dicNode,
+void PatriciaTriePolicy::createAndGetAllChildDicNodes(const DicNode *const dicNode,
         DicNodeVector *const childDicNodes) const {
     if (!dicNode->hasChildren()) {
         return;
     }
-    int nextPos = dicNode->getChildrenPos();
+    int nextPos = dicNode->getChildrenPtNodeArrayPos();
     if (nextPos < 0 || nextPos >= mDictBufferSize) {
         AKLOGE("Children PtNode array position is invalid. pos: %d, dict size: %d",
                 nextPos, mDictBufferSize);
@@ -52,14 +52,14 @@
 
 // This retrieves code points and the probability of the word by its terminal position.
 // Due to the fact that words are ordered in the dictionary in a strict breadth-first order,
-// it is possible to check for this with advantageous complexity. For each node, we search
+// it is possible to check for this with advantageous complexity. For each PtNode array, we search
 // for PtNodes with children and compare the children position with the position we look for.
 // When we shoot the position we look for, it means the word we look for is in the children
 // of the previous PtNode. The only tricky part is the fact that if we arrive at the end of a
 // PtNode array with the last PtNode's children position still less than what we are searching for,
 // we must descend the last PtNode's children (for example, if the word we are searching for starts
 // with a z, it's the last PtNode of the root array, so all children addresses will be smaller
-// than the position we look for, and we have to descend the z node).
+// than the position we look for, and we have to descend the z PtNode).
 /* Parameters :
  * ptNodePos: the byte position of the terminal PtNode of the word we are searching for (this is
  *   what is stored as the "bigram position" in each bigram)
@@ -74,9 +74,9 @@
     int pos = getRootPosition();
     int wordPos = 0;
     // One iteration of the outer loop iterates through PtNode arrays. As stated above, we will
-    // only traverse nodes that are actually a part of the terminal we are searching, so each time
-    // we enter this loop we are one depth level further than last time.
-    // The only reason we count nodes is because we want to reduce the probability of infinite
+    // only traverse PtNodes that are actually a part of the terminal we are searching, so each
+    // time we enter this loop we are one depth level further than last time.
+    // The only reason we count PtNodes is because we want to reduce the probability of infinite
     // looping in case there is a bug. Since we know there is an upper bound to the depth we are
     // supposed to traverse, it does not hurt to count iterations.
     for (int loopCount = maxCodePointCount; loopCount > 0; --loopCount) {
@@ -140,8 +140,9 @@
                     found = true;
                 } else if (1 >= ptNodeCount) {
                     // However if we are on the LAST PtNode of this array, and we have NOT shot the
-                    // position we should descend THIS node. So we trick the lastCandidatePtNodePos
-                    // so that we will descend this PtNode, not the previous one.
+                    // position we should descend THIS PtNode. So we trick the
+                    // lastCandidatePtNodePos so that we will descend this PtNode, not the previous
+                    // one.
                     lastCandidatePtNodePos = startPos;
                     found = true;
                 } else {
@@ -149,7 +150,7 @@
                     found = false;
                 }
             } else {
-                // Even if we don't have children here, we could still be on the last PtNode of /
+                // Even if we don't have children here, we could still be on the last PtNode of
                 // this array. If this is the case, we should descend the last PtNode that had
                 // children, and their position is already in lastCandidatePtNodePos.
                 found = (1 >= ptNodeCount);
@@ -230,9 +231,9 @@
     return 0;
 }
 
-// This function gets the position of the terminal node of the exact matching word in the
+// This function gets the position of the terminal PtNode of the exact matching word in the
 // dictionary. If no match is found, it returns NOT_A_DICT_POS.
-int PatriciaTriePolicy::getTerminalNodePositionOfWord(const int *const inWord,
+int PatriciaTriePolicy::getTerminalPtNodePositionOfWord(const int *const inWord,
         const int length, const bool forceLowerCaseSearch) const {
     int pos = getRootPosition();
     int wordPos = 0;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
similarity index 78%
rename from native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h
rename to native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
index 0f8662a..2adafd2 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
@@ -24,6 +24,7 @@
 #include "suggest/policyimpl/dictionary/bigram/bigram_list_policy.h"
 #include "suggest/policyimpl/dictionary/header/header_policy.h"
 #include "suggest/policyimpl/dictionary/shortcut/shortcut_list_policy.h"
+#include "suggest/policyimpl/dictionary/utils/format_utils.h"
 #include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
 
 namespace latinime {
@@ -33,28 +34,26 @@
 
 class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
  public:
-    PatriciaTriePolicy(const MmappedBuffer *const buffer)
-            : mBuffer(buffer), mHeaderPolicy(mBuffer->getBuffer(), buffer->getBufferSize()),
-              mDictRoot(mBuffer->getBuffer() + mHeaderPolicy.getSize()),
-              mDictBufferSize(mBuffer->getBufferSize() - mHeaderPolicy.getSize()),
+    PatriciaTriePolicy(const MmappedBuffer::MmappedBufferPtr &mmappedBuffer)
+            : mMmappedBuffer(mmappedBuffer),
+              mHeaderPolicy(mMmappedBuffer.get()->getBuffer(), FormatUtils::VERSION_2),
+              mDictRoot(mMmappedBuffer.get()->getBuffer() + mHeaderPolicy.getSize()),
+              mDictBufferSize(mMmappedBuffer.get()->getBufferSize()
+                      - mHeaderPolicy.getSize()),
               mBigramListPolicy(mDictRoot), mShortcutListPolicy(mDictRoot) {}
 
-    ~PatriciaTriePolicy() {
-        delete mBuffer;
-    }
-
     AK_FORCE_INLINE int getRootPosition() const {
         return 0;
     }
 
-    void createAndGetAllChildNodes(const DicNode *const dicNode,
+    void createAndGetAllChildDicNodes(const DicNode *const dicNode,
             DicNodeVector *const childDicNodes) const;
 
     int getCodePointsAndProbabilityAndReturnCodePointCount(
             const int terminalNodePos, const int maxCodePointCount, int *const outCodePoints,
             int *const outUnigramProbability) const;
 
-    int getTerminalNodePositionOfWord(const int *const inWord,
+    int getTerminalPtNodePositionOfWord(const int *const inWord,
             const int length, const bool forceLowerCaseSearch) const;
 
     int getProbability(const int unigramProbability, const int bigramProbability) const;
@@ -77,14 +76,17 @@
         return &mShortcutListPolicy;
     }
 
-    bool addUnigramWord(const int *const word, const int length, const int probability) {
+    bool addUnigramWord(const int *const word, const int length, const int probability,
+            const int *const shortcutTargetCodePoints, const int shortcutLength,
+            const int shortcutProbability, const bool isNotAWord, const bool isBlacklisted,
+            const int timestamp) {
         // This method should not be called for non-updatable dictionary.
         AKLOGI("Warning: addUnigramWord() is called for non-updatable dictionary.");
         return false;
     }
 
     bool addBigramWords(const int *const word0, const int length0, const int *const word1,
-            const int length1, const int probability) {
+            const int length1, const int probability, const int timestamp) {
         // This method should not be called for non-updatable dictionary.
         AKLOGI("Warning: addBigramWords() is called for non-updatable dictionary.");
         return false;
@@ -113,7 +115,7 @@
         return false;
     }
 
-    void getProperty(const char *const query, char *const outResult,
+    void getProperty(const char *const query, const int queryLength, char *const outResult,
             const int maxResultLength) {
         // getProperty is not supported for this class.
         if (maxResultLength > 0) {
@@ -121,10 +123,16 @@
         }
     }
 
+    const UnigramProperty getUnigramProperty(const int *const codePoints,
+            const int codePointCount) const {
+        // getUnigramProperty is not supported.
+        return UnigramProperty();
+    }
+
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(PatriciaTriePolicy);
 
-    const MmappedBuffer *const mBuffer;
+    const MmappedBuffer::MmappedBufferPtr mMmappedBuffer;
     const HeaderPolicy mHeaderPolicy;
     const uint8_t *const mDictRoot;
     const int mDictBufferSize;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_reading_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.cpp
similarity index 98%
rename from native/jni/src/suggest/policyimpl/dictionary/patricia_trie_reading_utils.cpp
rename to native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.cpp
index 7df5581..82b3593 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_reading_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.cpp
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-#include "suggest/policyimpl/dictionary/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
 
 #include "defines.h"
 #include "suggest/policyimpl/dictionary/utils/byte_array_utils.h"
diff --git a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_reading_utils.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h
similarity index 99%
rename from native/jni/src/suggest/policyimpl/dictionary/patricia_trie_reading_utils.h
rename to native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h
index 8420ee9..b28f583 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_reading_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h
@@ -23,6 +23,7 @@
 
 namespace latinime {
 
+// TODO: Move to pt_common
 class PatriciaTrieReadingUtils {
  public:
     typedef uint8_t NodeFlags;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.cpp
new file mode 100644
index 0000000..cb9d450
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.cpp
@@ -0,0 +1,202 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h"
+
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+const BigramEntry BigramDictContent::getBigramEntryAndAdvancePosition(
+        int *const bigramEntryPos) const {
+    const BufferWithExtendableBuffer *const bigramListBuffer = getContentBuffer();
+    const int bigramFlags = bigramListBuffer->readUintAndAdvancePosition(
+            Ver4DictConstants::BIGRAM_FLAGS_FIELD_SIZE, bigramEntryPos);
+    const bool hasNext = (bigramFlags & Ver4DictConstants::BIGRAM_HAS_NEXT_MASK) != 0;
+    int probability = NOT_A_PROBABILITY;
+    int timestamp = NOT_A_TIMESTAMP;
+    int level = 0;
+    int count = 0;
+    if (mHasHistoricalInfo) {
+        probability = bigramListBuffer->readUintAndAdvancePosition(
+                Ver4DictConstants::PROBABILITY_SIZE, bigramEntryPos);
+        timestamp = bigramListBuffer->readUintAndAdvancePosition(
+                Ver4DictConstants::TIME_STAMP_FIELD_SIZE, bigramEntryPos);
+        level = bigramListBuffer->readUintAndAdvancePosition(
+                Ver4DictConstants::WORD_LEVEL_FIELD_SIZE, bigramEntryPos);
+        count = bigramListBuffer->readUintAndAdvancePosition(
+                Ver4DictConstants::WORD_COUNT_FIELD_SIZE, bigramEntryPos);
+    } else {
+        probability = bigramFlags & Ver4DictConstants::BIGRAM_PROBABILITY_MASK;
+    }
+    const int encodedTargetTerminalId = bigramListBuffer->readUintAndAdvancePosition(
+            Ver4DictConstants::BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE, bigramEntryPos);
+    const int targetTerminalId =
+            (encodedTargetTerminalId == Ver4DictConstants::INVALID_BIGRAM_TARGET_TERMINAL_ID) ?
+                    Ver4DictConstants::NOT_A_TERMINAL_ID : encodedTargetTerminalId;
+    if (mHasHistoricalInfo) {
+        const HistoricalInfo historicalInfo(timestamp, level, count);
+        return BigramEntry(hasNext, probability, &historicalInfo, targetTerminalId);
+    } else {
+        return BigramEntry(hasNext, probability, targetTerminalId);
+    }
+}
+
+bool BigramDictContent::writeBigramEntryAndAdvancePosition(
+        const BigramEntry *const bigramEntryToWrite, int *const entryWritingPos) {
+    BufferWithExtendableBuffer *const bigramListBuffer = getWritableContentBuffer();
+    const int bigramFlags = createAndGetBigramFlags(
+            mHasHistoricalInfo ? 0 : bigramEntryToWrite->getProbability(),
+            bigramEntryToWrite->hasNext());
+    if (!bigramListBuffer->writeUintAndAdvancePosition(bigramFlags,
+            Ver4DictConstants::BIGRAM_FLAGS_FIELD_SIZE, entryWritingPos)) {
+        AKLOGE("Cannot write bigram flags. pos: %d, flags: %x", *entryWritingPos, bigramFlags);
+        return false;
+    }
+    if (mHasHistoricalInfo) {
+        if (!bigramListBuffer->writeUintAndAdvancePosition(bigramEntryToWrite->getProbability(),
+                Ver4DictConstants::PROBABILITY_SIZE, entryWritingPos)) {
+            AKLOGE("Cannot write bigram probability. pos: %d, probability: %d", *entryWritingPos,
+                    bigramEntryToWrite->getProbability());
+            return false;
+        }
+        const HistoricalInfo *const historicalInfo = bigramEntryToWrite->getHistoricalInfo();
+        if (!bigramListBuffer->writeUintAndAdvancePosition(historicalInfo->getTimeStamp(),
+                Ver4DictConstants::TIME_STAMP_FIELD_SIZE, entryWritingPos)) {
+            AKLOGE("Cannot write bigram timestamps. pos: %d, timestamp: %d", *entryWritingPos,
+                    historicalInfo->getTimeStamp());
+            return false;
+        }
+        if (!bigramListBuffer->writeUintAndAdvancePosition(historicalInfo->getLevel(),
+                Ver4DictConstants::WORD_LEVEL_FIELD_SIZE, entryWritingPos)) {
+            AKLOGE("Cannot write bigram level. pos: %d, level: %d", *entryWritingPos,
+                    historicalInfo->getLevel());
+            return false;
+        }
+        if (!bigramListBuffer->writeUintAndAdvancePosition(historicalInfo->getCount(),
+                Ver4DictConstants::WORD_COUNT_FIELD_SIZE, entryWritingPos)) {
+            AKLOGE("Cannot write bigram count. pos: %d, count: %d", *entryWritingPos,
+                    historicalInfo->getCount());
+            return false;
+        }
+    }
+    const int targetTerminalIdToWrite =
+            (bigramEntryToWrite->getTargetTerminalId() == Ver4DictConstants::NOT_A_TERMINAL_ID) ?
+                    Ver4DictConstants::INVALID_BIGRAM_TARGET_TERMINAL_ID :
+                            bigramEntryToWrite->getTargetTerminalId();
+    if (!bigramListBuffer->writeUintAndAdvancePosition(targetTerminalIdToWrite,
+            Ver4DictConstants::BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE, entryWritingPos)) {
+        AKLOGE("Cannot write bigram target terminal id. pos: %d, target terminal id: %d",
+                *entryWritingPos, bigramEntryToWrite->getTargetTerminalId());
+        return false;
+    }
+    return true;
+}
+
+bool BigramDictContent::copyBigramList(const int bigramListPos, const int toPos) {
+    int readingPos = bigramListPos;
+    int writingPos = toPos;
+    bool hasNext = true;
+    while (hasNext) {
+        const BigramEntry bigramEntry = getBigramEntryAndAdvancePosition(&readingPos);
+        hasNext = bigramEntry.hasNext();
+        if (!writeBigramEntryAndAdvancePosition(&bigramEntry, &writingPos)) {
+            AKLOGE("Cannot write bigram entry to copy. pos: %d", writingPos);
+            return false;
+        }
+    }
+    return true;
+}
+
+bool BigramDictContent::runGC(const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+        const BigramDictContent *const originalBigramDictContent,
+        int *const outBigramEntryCount) {
+    for (TerminalPositionLookupTable::TerminalIdMap::const_iterator it = terminalIdMap->begin();
+            it != terminalIdMap->end(); ++it) {
+        const int originalBigramListPos =
+                originalBigramDictContent->getBigramListHeadPos(it->first);
+        if (originalBigramListPos == NOT_A_DICT_POS) {
+            // This terminal does not have a bigram list.
+            continue;
+        }
+        const int bigramListPos = getContentBuffer()->getTailPosition();
+        int bigramEntryCount = 0;
+        // Copy bigram list with GC from original content.
+        if (!runGCBigramList(originalBigramListPos, originalBigramDictContent, bigramListPos,
+                terminalIdMap, &bigramEntryCount)) {
+            AKLOGE("Cannot complete GC for the bigram list. original pos: %d, pos: %d",
+                    originalBigramListPos, bigramListPos);
+            return false;
+        }
+        if (bigramEntryCount == 0) {
+            // All bigram entries are useless. This terminal does not have a bigram list.
+            continue;
+        }
+        *outBigramEntryCount += bigramEntryCount;
+        // Set bigram list position to the lookup table.
+        if (!getUpdatableAddressLookupTable()->set(it->second, bigramListPos)) {
+            AKLOGE("Cannot set bigram list position. terminal id: %d, pos: %d",
+                    it->second, bigramListPos);
+            return false;
+        }
+    }
+    return true;
+}
+
+// Returns whether GC for the bigram list was succeeded or not.
+bool BigramDictContent::runGCBigramList(const int bigramListPos,
+        const BigramDictContent *const sourceBigramDictContent, const int toPos,
+        const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+        int *const outEntrycount) {
+    bool hasNext = true;
+    int readingPos = bigramListPos;
+    int writingPos = toPos;
+    int lastEntryPos = NOT_A_DICT_POS;
+    while (hasNext) {
+        const BigramEntry originalBigramEntry =
+                sourceBigramDictContent->getBigramEntryAndAdvancePosition(&readingPos);
+        hasNext = originalBigramEntry.hasNext();
+        if (originalBigramEntry.getTargetTerminalId() == Ver4DictConstants::NOT_A_TERMINAL_ID) {
+            continue;
+        }
+        TerminalPositionLookupTable::TerminalIdMap::const_iterator it =
+                terminalIdMap->find(originalBigramEntry.getTargetTerminalId());
+        if (it == terminalIdMap->end()) {
+            // Target word has been removed.
+            continue;
+        }
+        lastEntryPos = hasNext ? writingPos : NOT_A_DICT_POS;
+        const BigramEntry updatedBigramEntry =
+                originalBigramEntry.updateTargetTerminalIdAndGetEntry(it->second);
+        if (!writeBigramEntryAndAdvancePosition(&updatedBigramEntry, &writingPos)) {
+            AKLOGE("Cannot write bigram entry to run GC. pos: %d", writingPos);
+            return false;
+        }
+        *outEntrycount += 1;
+    }
+    if (lastEntryPos != NOT_A_DICT_POS) {
+        // Update has next flag in the last written entry.
+        const BigramEntry bigramEntry = getBigramEntry(lastEntryPos).updateHasNextAndGetEntry(
+                false /* hasNext */);
+        if (!writeBigramEntry(&bigramEntry, lastEntryPos)) {
+            AKLOGE("Cannot write bigram entry to set hasNext flag after GC. pos: %d", writingPos);
+            return false;
+        }
+    }
+    return true;
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h
new file mode 100644
index 0000000..ba2a052
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_BIGRAM_DICT_CONTENT_H
+#define LATINIME_BIGRAM_DICT_CONTENT_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/bigram_entry.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+
+namespace latinime {
+
+class BigramDictContent : public SparseTableDictContent {
+ public:
+    BigramDictContent(const char *const dictPath, const bool hasHistoricalInfo,
+            const bool isUpdatable)
+            : SparseTableDictContent(dictPath,
+                      Ver4DictConstants::BIGRAM_LOOKUP_TABLE_FILE_EXTENSION,
+                      Ver4DictConstants::BIGRAM_CONTENT_TABLE_FILE_EXTENSION,
+                      Ver4DictConstants::BIGRAM_FILE_EXTENSION, isUpdatable,
+                      Ver4DictConstants::BIGRAM_ADDRESS_TABLE_BLOCK_SIZE,
+                      Ver4DictConstants::BIGRAM_ADDRESS_TABLE_DATA_SIZE),
+              mHasHistoricalInfo(hasHistoricalInfo) {}
+
+    BigramDictContent(const bool hasHistoricalInfo)
+            : SparseTableDictContent(Ver4DictConstants::BIGRAM_ADDRESS_TABLE_BLOCK_SIZE,
+                      Ver4DictConstants::BIGRAM_ADDRESS_TABLE_DATA_SIZE),
+              mHasHistoricalInfo(hasHistoricalInfo) {}
+
+    const BigramEntry getBigramEntry(const int bigramEntryPos) const {
+        int readingPos = bigramEntryPos;
+        return getBigramEntryAndAdvancePosition(&readingPos);
+    }
+
+    const BigramEntry getBigramEntryAndAdvancePosition(int *const bigramEntryPos) const;
+
+    // Returns head position of bigram list for a PtNode specified by terminalId.
+    int getBigramListHeadPos(const int terminalId) const {
+        const SparseTable *const addressLookupTable = getAddressLookupTable();
+        if (!addressLookupTable->contains(terminalId)) {
+            return NOT_A_DICT_POS;
+        }
+        return addressLookupTable->get(terminalId);
+    }
+
+    bool writeBigramEntry(const BigramEntry *const bigramEntryToWrite, const int entryWritingPos) {
+        int writingPos = entryWritingPos;
+        return writeBigramEntryAndAdvancePosition(bigramEntryToWrite, &writingPos);
+    }
+
+    bool writeBigramEntryAndAdvancePosition(const BigramEntry *const bigramEntryToWrite,
+            int *const entryWritingPos);
+
+    bool createNewBigramList(const int terminalId) {
+        const int bigramListPos = getContentBuffer()->getTailPosition();
+        return getUpdatableAddressLookupTable()->set(terminalId, bigramListPos);
+    }
+
+    bool copyBigramList(const int bigramListPos, const int toPos);
+
+    bool flushToFile(const char *const dictPath) const {
+        return flush(dictPath, Ver4DictConstants::BIGRAM_LOOKUP_TABLE_FILE_EXTENSION,
+                Ver4DictConstants::BIGRAM_CONTENT_TABLE_FILE_EXTENSION,
+                Ver4DictConstants::BIGRAM_FILE_EXTENSION);
+    }
+
+    bool runGC(const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+            const BigramDictContent *const originalBigramDictContent,
+            int *const outBigramEntryCount);
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(BigramDictContent);
+
+    int createAndGetBigramFlags(const int probability, const bool hasNext) const {
+        return (probability & Ver4DictConstants::BIGRAM_PROBABILITY_MASK)
+                | (hasNext ? Ver4DictConstants::BIGRAM_HAS_NEXT_MASK : 0);
+    }
+
+    bool runGCBigramList(const int bigramListPos,
+            const BigramDictContent *const sourceBigramDictContent, const int toPos,
+            const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+            int *const outEntryCount);
+
+    bool mHasHistoricalInfo;
+};
+} // namespace latinime
+#endif /* LATINIME_BIGRAM_DICT_CONTENT_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_entry.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_entry.h
new file mode 100644
index 0000000..2b0cbd9
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/bigram_entry.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_BIGRAM_ENTRY_H
+#define LATINIME_BIGRAM_ENTRY_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/historical_info.h"
+
+namespace latinime {
+
+class BigramEntry {
+ public:
+    BigramEntry(const BigramEntry& bigramEntry)
+            : mHasNext(bigramEntry.mHasNext), mProbability(bigramEntry.mProbability),
+              mHistoricalInfo(), mTargetTerminalId(bigramEntry.mTargetTerminalId) {}
+
+    // Entry with historical information.
+    BigramEntry(const bool hasNext, const int probability, const int targetTerminalId)
+            : mHasNext(hasNext), mProbability(probability), mHistoricalInfo(),
+              mTargetTerminalId(targetTerminalId) {}
+
+    // Entry with historical information.
+    BigramEntry(const bool hasNext, const int probability,
+            const HistoricalInfo *const historicalInfo, const int targetTerminalId)
+            : mHasNext(hasNext), mProbability(probability), mHistoricalInfo(*historicalInfo),
+              mTargetTerminalId(targetTerminalId) {}
+
+    const BigramEntry getInvalidatedEntry() const {
+        return updateTargetTerminalIdAndGetEntry(Ver4DictConstants::NOT_A_TERMINAL_ID);
+    }
+
+    const BigramEntry updateHasNextAndGetEntry(const bool hasNext) const {
+        return BigramEntry(hasNext, mProbability, &mHistoricalInfo, mTargetTerminalId);
+    }
+
+    const BigramEntry updateTargetTerminalIdAndGetEntry(const int newTargetTerminalId) const {
+        return BigramEntry(mHasNext, mProbability, &mHistoricalInfo, newTargetTerminalId);
+    }
+
+    const BigramEntry updateProbabilityAndGetEntry(const int probability) const {
+        return BigramEntry(mHasNext, probability, &mHistoricalInfo, mTargetTerminalId);
+    }
+
+    const BigramEntry updateHistoricalInfoAndGetEntry(
+            const HistoricalInfo *const historicalInfo) const {
+        return BigramEntry(mHasNext, mProbability, historicalInfo, mTargetTerminalId);
+    }
+
+    bool isValid() const {
+        return mTargetTerminalId != Ver4DictConstants::NOT_A_TERMINAL_ID;
+    }
+
+    bool hasNext() const {
+        return mHasNext;
+    }
+
+    int getProbability() const {
+        return mProbability;
+    }
+
+    bool hasHistoricalInfo() const {
+        return mHistoricalInfo.isValid();
+    }
+
+    const HistoricalInfo *getHistoricalInfo() const {
+        return &mHistoricalInfo;
+    }
+
+    int getTargetTerminalId() const {
+        return mTargetTerminalId;
+    }
+
+ private:
+    // Copy constructor is public to use this class as a type of return value.
+    DISALLOW_DEFAULT_CONSTRUCTOR(BigramEntry);
+    DISALLOW_ASSIGNMENT_OPERATOR(BigramEntry);
+
+    const bool mHasNext;
+    const int mProbability;
+    const HistoricalInfo mHistoricalInfo;
+    const int mTargetTerminalId;
+};
+} // namespace latinime
+#endif /* LATINIME_BIGRAM_ENTRY_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/dict_content.h
new file mode 100644
index 0000000..0c2f470
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/dict_content.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_DICT_CONTENT_H
+#define LATINIME_DICT_CONTENT_H
+
+#include "defines.h"
+
+namespace latinime {
+
+class DictContent {
+ public:
+    virtual ~DictContent() {}
+    virtual bool isValid() const = 0;
+
+ protected:
+    DictContent() {}
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(DictContent);
+};
+} // namespace latinime
+#endif /* LATINIME_DICT_CONTENT_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.cpp
new file mode 100644
index 0000000..3b7c70e
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.cpp
@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h"
+
+#include "suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+const ProbabilityEntry ProbabilityDictContent::getProbabilityEntry(const int terminalId) const {
+    if (terminalId < 0 || terminalId >= mSize) {
+        // This method can be called with invalid terminal id during GC.
+        return ProbabilityEntry(0 /* flags */, NOT_A_PROBABILITY);
+    }
+    const BufferWithExtendableBuffer *const buffer = getBuffer();
+    int entryPos = getEntryPos(terminalId);
+    const int flags = buffer->readUintAndAdvancePosition(
+            Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE, &entryPos);
+    const int probability = buffer->readUintAndAdvancePosition(
+            Ver4DictConstants::PROBABILITY_SIZE, &entryPos);
+    if (mHasHistoricalInfo) {
+        const int timestamp = buffer->readUintAndAdvancePosition(
+                Ver4DictConstants::TIME_STAMP_FIELD_SIZE, &entryPos);
+        const int level = buffer->readUintAndAdvancePosition(
+                Ver4DictConstants::WORD_LEVEL_FIELD_SIZE, &entryPos);
+        const int count = buffer->readUintAndAdvancePosition(
+                Ver4DictConstants::WORD_COUNT_FIELD_SIZE, &entryPos);
+        const HistoricalInfo historicalInfo(timestamp, level, count);
+        return ProbabilityEntry(flags, probability, &historicalInfo);
+    } else {
+        return ProbabilityEntry(flags, probability);
+    }
+}
+
+bool ProbabilityDictContent::setProbabilityEntry(const int terminalId,
+        const ProbabilityEntry *const probabilityEntry) {
+    if (terminalId < 0) {
+        return false;
+    }
+    const int entryPos = getEntryPos(terminalId);
+    if (terminalId >= mSize) {
+        ProbabilityEntry dummyEntry;
+        // Write new entry.
+        int writingPos = getBuffer()->getTailPosition();
+        while (writingPos <= entryPos) {
+            // Fulfilling with dummy entries until writingPos.
+            if (!writeEntry(&dummyEntry, writingPos)) {
+                AKLOGE("Cannot write dummy entry. pos: %d, mSize: %d", writingPos, mSize);
+                return false;
+            }
+            writingPos += getEntrySize();
+            mSize++;
+        }
+    }
+    return writeEntry(probabilityEntry, entryPos);
+}
+
+bool ProbabilityDictContent::flushToFile(const char *const dictPath) const {
+    if (getEntryPos(mSize) < getBuffer()->getTailPosition()) {
+        ProbabilityDictContent probabilityDictContentToWrite(mHasHistoricalInfo);
+        for (int i = 0; i < mSize; ++i) {
+            const ProbabilityEntry probabilityEntry = getProbabilityEntry(i);
+            if (!probabilityDictContentToWrite.setProbabilityEntry(i, &probabilityEntry)) {
+                AKLOGE("Cannot set probability entry in flushToFile. terminalId: %d", i);
+                return false;
+            }
+        }
+        return probabilityDictContentToWrite.flush(dictPath,
+                Ver4DictConstants::FREQ_FILE_EXTENSION);
+    } else {
+        return flush(dictPath, Ver4DictConstants::FREQ_FILE_EXTENSION);
+    }
+}
+
+bool ProbabilityDictContent::runGC(
+        const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+        const ProbabilityDictContent *const originalProbabilityDictContent) {
+    mSize = 0;
+    for (TerminalPositionLookupTable::TerminalIdMap::const_iterator it = terminalIdMap->begin();
+            it != terminalIdMap->end(); ++it) {
+        const ProbabilityEntry probabilityEntry =
+                originalProbabilityDictContent->getProbabilityEntry(it->first);
+        if (!setProbabilityEntry(it->second, &probabilityEntry)) {
+            AKLOGE("Cannot set probability entry in runGC. terminalId: %d", it->second);
+            return false;
+        }
+        mSize++;
+    }
+    return true;
+}
+
+int ProbabilityDictContent::getEntrySize() const {
+    if (mHasHistoricalInfo) {
+        return Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE
+                + Ver4DictConstants::PROBABILITY_SIZE
+                + Ver4DictConstants::TIME_STAMP_FIELD_SIZE
+                + Ver4DictConstants::WORD_LEVEL_FIELD_SIZE
+                + Ver4DictConstants::WORD_COUNT_FIELD_SIZE;
+    } else {
+        return Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE
+                + Ver4DictConstants::PROBABILITY_SIZE;
+    }
+}
+
+int ProbabilityDictContent::getEntryPos(const int terminalId) const {
+    return terminalId * getEntrySize();
+}
+
+bool ProbabilityDictContent::writeEntry(const ProbabilityEntry *const probabilityEntry,
+        const int entryPos) {
+    BufferWithExtendableBuffer *const bufferToWrite = getWritableBuffer();
+    int writingPos = entryPos;
+    if (!bufferToWrite->writeUintAndAdvancePosition(probabilityEntry->getFlags(),
+            Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE, &writingPos)) {
+        AKLOGE("Cannot write flags in probability dict content. pos: %d", writingPos);
+        return false;
+    }
+    if (!bufferToWrite->writeUintAndAdvancePosition(probabilityEntry->getProbability(),
+            Ver4DictConstants::PROBABILITY_SIZE, &writingPos)) {
+        AKLOGE("Cannot write probability in probability dict content. pos: %d", writingPos);
+        return false;
+    }
+    if (mHasHistoricalInfo) {
+        const HistoricalInfo *const historicalInfo = probabilityEntry->getHistoricalInfo();
+        if (!bufferToWrite->writeUintAndAdvancePosition(historicalInfo->getTimeStamp(),
+                Ver4DictConstants::TIME_STAMP_FIELD_SIZE, &writingPos)) {
+            AKLOGE("Cannot write timestamp in probability dict content. pos: %d", writingPos);
+            return false;
+        }
+        if (!bufferToWrite->writeUintAndAdvancePosition(historicalInfo->getLevel(),
+                Ver4DictConstants::WORD_LEVEL_FIELD_SIZE, &writingPos)) {
+            AKLOGE("Cannot write level in probability dict content. pos: %d", writingPos);
+            return false;
+        }
+        if (!bufferToWrite->writeUintAndAdvancePosition(historicalInfo->getCount(),
+                Ver4DictConstants::WORD_COUNT_FIELD_SIZE, &writingPos)) {
+            AKLOGE("Cannot write count in probability dict content. pos: %d", writingPos);
+            return false;
+        }
+    }
+    return true;
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h
new file mode 100644
index 0000000..b065bc9
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_PROBABILITY_DICT_CONTENT_H
+#define LATINIME_PROBABILITY_DICT_CONTENT_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+class ProbabilityEntry;
+
+class ProbabilityDictContent : public SingleDictContent {
+ public:
+    ProbabilityDictContent(const char *const dictPath, const bool hasHistoricalInfo,
+            const bool isUpdatable)
+            : SingleDictContent(dictPath, Ver4DictConstants::FREQ_FILE_EXTENSION, isUpdatable),
+              mHasHistoricalInfo(hasHistoricalInfo),
+              mSize(getBuffer()->getTailPosition() / getEntrySize()) {}
+
+    ProbabilityDictContent(const bool hasHistoricalInfo)
+            : mHasHistoricalInfo(hasHistoricalInfo), mSize(0) {}
+
+    const ProbabilityEntry getProbabilityEntry(const int terminalId) const;
+
+    bool setProbabilityEntry(const int terminalId, const ProbabilityEntry *const probabilityEntry);
+
+    bool flushToFile(const char *const dictPath) const;
+
+    bool runGC(const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+            const ProbabilityDictContent *const originalProbabilityDictContent);
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(ProbabilityDictContent);
+
+    int getEntrySize() const;
+
+    int getEntryPos(const int terminalId) const;
+
+    bool writeEntry(const ProbabilityEntry *const probabilityEntry, const int entryPos);
+
+    bool mHasHistoricalInfo;
+    int mSize;
+};
+} // namespace latinime
+#endif /* LATINIME_PROBABILITY_DICT_CONTENT_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h
new file mode 100644
index 0000000..36ba82b
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_PROBABILITY_ENTRY_H
+#define LATINIME_PROBABILITY_ENTRY_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/historical_info.h"
+
+namespace latinime {
+
+class ProbabilityEntry {
+ public:
+    ProbabilityEntry(const ProbabilityEntry &probabilityEntry)
+            : mFlags(probabilityEntry.mFlags), mProbability(probabilityEntry.mProbability),
+              mHistoricalInfo(probabilityEntry.mHistoricalInfo) {}
+
+    // Dummy entry
+    ProbabilityEntry()
+            : mFlags(0), mProbability(NOT_A_PROBABILITY), mHistoricalInfo() {}
+
+    // Entry without historical information
+    ProbabilityEntry(const int flags, const int probability)
+            : mFlags(flags), mProbability(probability), mHistoricalInfo() {}
+
+    // Entry with historical information.
+    ProbabilityEntry(const int flags, const int probability,
+            const HistoricalInfo *const historicalInfo)
+            : mFlags(flags), mProbability(probability), mHistoricalInfo(*historicalInfo) {}
+
+    const ProbabilityEntry createEntryWithUpdatedProbability(const int probability) const {
+        return ProbabilityEntry(mFlags, probability, &mHistoricalInfo);
+    }
+
+    const ProbabilityEntry createEntryWithUpdatedHistoricalInfo(
+            const HistoricalInfo *const historicalInfo) const {
+        return ProbabilityEntry(mFlags, mProbability, historicalInfo);
+    }
+
+    bool hasHistoricalInfo() const {
+        return mHistoricalInfo.isValid();
+    }
+
+    int getFlags() const {
+        return mFlags;
+    }
+
+    int getProbability() const {
+        return mProbability;
+    }
+
+    const HistoricalInfo *getHistoricalInfo() const {
+        return &mHistoricalInfo;
+    }
+
+ private:
+    // Copy constructor is public to use this class as a type of return value.
+    DISALLOW_ASSIGNMENT_OPERATOR(ProbabilityEntry);
+
+    const int mFlags;
+    const int mProbability;
+    const HistoricalInfo mHistoricalInfo;
+};
+} // namespace latinime
+#endif /* LATINIME_PROBABILITY_ENTRY_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.cpp
new file mode 100644
index 0000000..29972a4
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.cpp
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h"
+
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+void ShortcutDictContent::getShortcutEntryAndAdvancePosition(const int maxCodePointCount,
+        int *const outCodePoint, int *const outCodePointCount, int *const outProbability,
+        bool *const outhasNext, int *const shortcutEntryPos) const {
+    const BufferWithExtendableBuffer *const shortcutListBuffer = getContentBuffer();
+    const int shortcutFlags = shortcutListBuffer->readUintAndAdvancePosition(
+            Ver4DictConstants::SHORTCUT_FLAGS_FIELD_SIZE, shortcutEntryPos);
+    if (outProbability) {
+        *outProbability = shortcutFlags & Ver4DictConstants::SHORTCUT_PROBABILITY_MASK;
+    }
+    if (outhasNext) {
+        *outhasNext = shortcutFlags & Ver4DictConstants::SHORTCUT_HAS_NEXT_MASK;
+    }
+    if (outCodePoint && outCodePointCount) {
+        shortcutListBuffer->readCodePointsAndAdvancePosition(
+                maxCodePointCount, outCodePoint, outCodePointCount, shortcutEntryPos);
+    }
+}
+
+int ShortcutDictContent::getShortcutListHeadPos(const int terminalId) const {
+    const SparseTable *const addressLookupTable = getAddressLookupTable();
+    if (!addressLookupTable->contains(terminalId)) {
+        return NOT_A_DICT_POS;
+    }
+    return addressLookupTable->get(terminalId);
+}
+
+bool ShortcutDictContent::flushToFile(const char *const dictPath) const {
+    return flush(dictPath, Ver4DictConstants::SHORTCUT_LOOKUP_TABLE_FILE_EXTENSION,
+            Ver4DictConstants::SHORTCUT_CONTENT_TABLE_FILE_EXTENSION,
+            Ver4DictConstants::SHORTCUT_FILE_EXTENSION);
+}
+
+bool ShortcutDictContent::runGC(
+        const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+        const ShortcutDictContent *const originalShortcutDictContent) {
+   for (TerminalPositionLookupTable::TerminalIdMap::const_iterator it = terminalIdMap->begin();
+           it != terminalIdMap->end(); ++it) {
+       const int originalShortcutListPos =
+               originalShortcutDictContent->getShortcutListHeadPos(it->first);
+       if (originalShortcutListPos == NOT_A_DICT_POS) {
+           continue;
+       }
+       const int shortcutListPos = getContentBuffer()->getTailPosition();
+       // Copy shortcut list from original content.
+       if (!copyShortcutListFromDictContent(originalShortcutListPos, originalShortcutDictContent,
+               shortcutListPos)) {
+           AKLOGE("Cannot copy shortcut list during GC. original pos: %d, pos: %d",
+                   originalShortcutListPos, shortcutListPos);
+           return false;
+       }
+       // Set shortcut list position to the lookup table.
+       if (!getUpdatableAddressLookupTable()->set(it->second, shortcutListPos)) {
+           AKLOGE("Cannot set shortcut list position. terminal id: %d, pos: %d",
+                   it->second, shortcutListPos);
+           return false;
+       }
+   }
+   return true;
+}
+
+bool ShortcutDictContent::createNewShortcutList(const int terminalId) {
+    const int shortcutListListPos = getContentBuffer()->getTailPosition();
+    return getUpdatableAddressLookupTable()->set(terminalId, shortcutListListPos);
+}
+
+bool ShortcutDictContent::copyShortcutList(const int shortcutListPos, const int toPos) {
+    return copyShortcutListFromDictContent(shortcutListPos, this, toPos);
+}
+
+bool ShortcutDictContent::copyShortcutListFromDictContent(const int shortcutListPos,
+        const ShortcutDictContent *const sourceShortcutDictContent, const int toPos) {
+    bool hasNext = true;
+    int readingPos = shortcutListPos;
+    int writingPos = toPos;
+    int codePoints[MAX_WORD_LENGTH];
+    while (hasNext) {
+        int probability = 0;
+        int codePointCount = 0;
+        sourceShortcutDictContent->getShortcutEntryAndAdvancePosition(MAX_WORD_LENGTH,
+                codePoints, &codePointCount, &probability, &hasNext, &readingPos);
+        if (!writeShortcutEntryAndAdvancePosition(codePoints, codePointCount, probability,
+                hasNext, &writingPos)) {
+            AKLOGE("Cannot write shortcut entry to copy. pos: %d", writingPos);
+            return false;
+        }
+    }
+    return true;
+}
+
+bool ShortcutDictContent::setProbability(const int probability, const int shortcutEntryPos) {
+    BufferWithExtendableBuffer *const shortcutListBuffer = getWritableContentBuffer();
+    const int shortcutFlags = shortcutListBuffer->readUint(
+            Ver4DictConstants::SHORTCUT_FLAGS_FIELD_SIZE, shortcutEntryPos);
+    const bool hasNext = shortcutFlags & Ver4DictConstants::SHORTCUT_HAS_NEXT_MASK;
+    const int shortcutFlagsToWrite = createAndGetShortcutFlags(probability, hasNext);
+    return shortcutListBuffer->writeUint(shortcutFlagsToWrite,
+            Ver4DictConstants::SHORTCUT_FLAGS_FIELD_SIZE, shortcutEntryPos);
+}
+
+bool ShortcutDictContent::writeShortcutEntryAndAdvancePosition(const int *const codePoint,
+        const int codePointCount, const int probability, const bool hasNext,
+        int *const shortcutEntryPos) {
+    BufferWithExtendableBuffer *const shortcutListBuffer = getWritableContentBuffer();
+    const int shortcutFlags = createAndGetShortcutFlags(probability, hasNext);
+    if (!shortcutListBuffer->writeUintAndAdvancePosition(shortcutFlags,
+            Ver4DictConstants::SHORTCUT_FLAGS_FIELD_SIZE, shortcutEntryPos)) {
+        AKLOGE("Cannot write shortcut flags. flags; %x, pos: %d", shortcutFlags, *shortcutEntryPos);
+        return false;
+    }
+    if (!shortcutListBuffer->writeCodePointsAndAdvancePosition(codePoint, codePointCount,
+            true /* writesTerminator */, shortcutEntryPos)) {
+        AKLOGE("Cannot write shortcut target code points. pos: %d", *shortcutEntryPos);
+        return false;
+    }
+    return true;
+}
+
+// Find a shortcut entry that has specified target and return its position.
+int ShortcutDictContent::findShortcutEntryAndGetPos(const int shortcutListPos,
+        const int *const targetCodePointsToFind, const int codePointCount) const {
+    bool hasNext = true;
+    int readingPos = shortcutListPos;
+    int targetCodePoints[MAX_WORD_LENGTH];
+    while (hasNext) {
+        const int entryPos = readingPos;
+        int probability = 0;
+        int targetCodePointCount = 0;
+        getShortcutEntryAndAdvancePosition(MAX_WORD_LENGTH, targetCodePoints, &targetCodePointCount,
+                &probability, &hasNext, &readingPos);
+        if (targetCodePointCount != codePointCount) {
+            continue;
+        }
+        bool matched = true;
+        for (int i = 0; i < codePointCount; ++i) {
+            if (targetCodePointsToFind[i] != targetCodePoints[i]) {
+                matched = false;
+                break;
+            }
+        }
+        if (matched) {
+            return entryPos;
+        }
+    }
+    return NOT_A_DICT_POS;
+}
+
+int ShortcutDictContent::createAndGetShortcutFlags(const int probability,
+        const bool hasNext) const {
+    return (probability & Ver4DictConstants::SHORTCUT_PROBABILITY_MASK)
+            | (hasNext ? Ver4DictConstants::SHORTCUT_HAS_NEXT_MASK : 0);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h
new file mode 100644
index 0000000..eaafc27
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_SHORTCUT_DICT_CONTENT_H
+#define LATINIME_SHORTCUT_DICT_CONTENT_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+
+namespace latinime {
+
+class ShortcutDictContent : public SparseTableDictContent {
+ public:
+    ShortcutDictContent(const char *const dictPath, const bool isUpdatable)
+            : SparseTableDictContent(dictPath,
+                      Ver4DictConstants::SHORTCUT_LOOKUP_TABLE_FILE_EXTENSION,
+                      Ver4DictConstants::SHORTCUT_CONTENT_TABLE_FILE_EXTENSION,
+                      Ver4DictConstants::SHORTCUT_FILE_EXTENSION, isUpdatable,
+                      Ver4DictConstants::SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE,
+                      Ver4DictConstants::SHORTCUT_ADDRESS_TABLE_DATA_SIZE) {}
+
+    ShortcutDictContent()
+            : SparseTableDictContent(Ver4DictConstants::SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE,
+                      Ver4DictConstants::SHORTCUT_ADDRESS_TABLE_DATA_SIZE) {}
+
+    void getShortcutEntry(const int maxCodePointCount, int *const outCodePoint,
+            int *const outCodePointCount, int *const outProbability, bool *const outhasNext,
+            const int shortcutEntryPos) {
+        int readingPos = shortcutEntryPos;
+        return getShortcutEntryAndAdvancePosition(maxCodePointCount, outCodePoint,
+                outCodePointCount, outProbability, outhasNext, &readingPos);
+    }
+
+    void getShortcutEntryAndAdvancePosition(const int maxCodePointCount,
+            int *const outCodePoint, int *const outCodePointCount, int *const outProbability,
+            bool *const outhasNext, int *const shortcutEntryPos) const;
+
+   // Returns head position of shortcut list for a PtNode specified by terminalId.
+   int getShortcutListHeadPos(const int terminalId) const;
+
+   bool flushToFile(const char *const dictPath) const;
+
+   bool runGC(const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap,
+           const ShortcutDictContent *const originalShortcutDictContent);
+
+   bool createNewShortcutList(const int terminalId);
+
+   bool copyShortcutList(const int shortcutListPos, const int toPos);
+
+   bool setProbability(const int probability, const int shortcutEntryPos);
+
+   bool writeShortcutEntry(const int *const codePoint, const int codePointCount,
+           const int probability, const bool hasNext, const int shortcutEntryPos) {
+       int writingPos = shortcutEntryPos;
+       return writeShortcutEntryAndAdvancePosition(codePoint, codePointCount, probability,
+               hasNext, &writingPos);
+   }
+
+   bool writeShortcutEntryAndAdvancePosition(const int *const codePoint,
+           const int codePointCount, const int probability, const bool hasNext,
+           int *const shortcutEntryPos);
+
+   int findShortcutEntryAndGetPos(const int shortcutListPos,
+           const int *const targetCodePointsToFind, const int codePointCount) const;
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(ShortcutDictContent);
+
+    bool copyShortcutListFromDictContent(const int shortcutListPos,
+            const ShortcutDictContent *const sourceShortcutDictContent, const int toPos);
+
+    int createAndGetShortcutFlags(const int probability, const bool hasNext) const;
+};
+} // namespace latinime
+#endif /* LATINIME_SHORTCUT_DICT_CONTENT_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h
new file mode 100644
index 0000000..9064b7e
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_SINGLE_DICT_CONTENT_H
+#define LATINIME_SINGLE_DICT_CONTENT_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+
+namespace latinime {
+
+class SingleDictContent : public DictContent {
+ public:
+    SingleDictContent(const char *const dictPath, const char *const contentFileName,
+            const bool isUpdatable)
+            : mMmappedBuffer(MmappedBuffer::openBuffer(dictPath, contentFileName, isUpdatable)),
+              mExpandableContentBuffer(mMmappedBuffer.get() ? mMmappedBuffer.get()->getBuffer() : 0,
+                      mMmappedBuffer.get() ? mMmappedBuffer.get()->getBufferSize() : 0,
+                      BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
+              mIsValid(mMmappedBuffer.get() != 0) {}
+
+    SingleDictContent()
+            : mMmappedBuffer(0), mExpandableContentBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
+              mIsValid(true) {}
+
+    virtual ~SingleDictContent() {}
+
+    virtual bool isValid() const {
+        return mIsValid;
+    }
+
+    bool isNearSizeLimit() const {
+        return mExpandableContentBuffer.isNearSizeLimit();
+    }
+
+ protected:
+    BufferWithExtendableBuffer *getWritableBuffer() {
+        return &mExpandableContentBuffer;
+    }
+
+    const BufferWithExtendableBuffer *getBuffer() const {
+        return &mExpandableContentBuffer;
+    }
+
+    bool flush(const char *const dictPath, const char *const contentFileNameSuffix) const {
+        return DictFileWritingUtils::flushBufferToFileWithSuffix(dictPath,
+                contentFileNameSuffix, &mExpandableContentBuffer);
+    }
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(SingleDictContent);
+
+    const MmappedBuffer::MmappedBufferPtr mMmappedBuffer;
+    BufferWithExtendableBuffer mExpandableContentBuffer;
+    const bool mIsValid;
+};
+} // namespace latinime
+#endif /* LATINIME_SINGLE_DICT_CONTENT_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.cpp
new file mode 100644
index 0000000..63c6ea3
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h"
+
+namespace latinime {
+
+bool SparseTableDictContent::flush(const char *const dictPath,
+        const char *const lookupTableFileNameSuffix, const char *const addressTableFileNameSuffix,
+        const char *const contentFileNameSuffix) const {
+    if (!DictFileWritingUtils::flushBufferToFileWithSuffix(dictPath, lookupTableFileNameSuffix,
+            &mExpandableLookupTableBuffer)){
+        return false;
+    }
+    if (!DictFileWritingUtils::flushBufferToFileWithSuffix(dictPath, addressTableFileNameSuffix,
+            &mExpandableAddressTableBuffer)) {
+        return false;
+    }
+    if (!DictFileWritingUtils::flushBufferToFileWithSuffix(dictPath, contentFileNameSuffix,
+            &mExpandableContentBuffer)) {
+        return false;
+    }
+    return true;
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h
new file mode 100644
index 0000000..a82e3f5
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/sparse_table_dict_content.h
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_SPARSE_TABLE_DICT_CONTENT_H
+#define LATINIME_SPARSE_TABLE_DICT_CONTENT_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/sparse_table.h"
+
+namespace latinime {
+
+// TODO: Support multiple contents.
+class SparseTableDictContent : public DictContent {
+ public:
+    AK_FORCE_INLINE SparseTableDictContent(const char *const dictPath,
+            const char *const lookupTableFileName, const char *const addressTableFileName,
+            const char *const contentFileName, const bool isUpdatable,
+            const int sparseTableBlockSize, const int sparseTableDataSize)
+            : mLookupTableBuffer(
+                      MmappedBuffer::openBuffer(dictPath, lookupTableFileName, isUpdatable)),
+              mAddressTableBuffer(
+                      MmappedBuffer::openBuffer(dictPath, addressTableFileName, isUpdatable)),
+              mContentBuffer(MmappedBuffer::openBuffer(dictPath, contentFileName, isUpdatable)),
+              mExpandableLookupTableBuffer(
+                      mLookupTableBuffer.get() ? mLookupTableBuffer.get()->getBuffer() : 0,
+                      mLookupTableBuffer.get() ? mLookupTableBuffer.get()->getBufferSize() : 0,
+                      BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
+              mExpandableAddressTableBuffer(
+                      mAddressTableBuffer.get() ? mAddressTableBuffer.get()->getBuffer() : 0,
+                      mAddressTableBuffer.get() ? mAddressTableBuffer.get()->getBufferSize() : 0,
+                      BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
+              mExpandableContentBuffer(mContentBuffer.get() ? mContentBuffer.get()->getBuffer() : 0,
+                      mContentBuffer.get() ? mContentBuffer.get()->getBufferSize() : 0,
+                      BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
+              mAddressLookupTable(&mExpandableLookupTableBuffer, &mExpandableAddressTableBuffer,
+                      sparseTableBlockSize, sparseTableDataSize),
+              mIsValid(mLookupTableBuffer.get() != 0 && mAddressTableBuffer.get() != 0
+                      && mContentBuffer.get() != 0) {}
+
+    SparseTableDictContent(const int sparseTableBlockSize, const int sparseTableDataSize)
+            : mLookupTableBuffer(0), mAddressTableBuffer(0), mContentBuffer(0),
+              mExpandableLookupTableBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
+              mExpandableAddressTableBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
+              mExpandableContentBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
+              mAddressLookupTable(&mExpandableLookupTableBuffer, &mExpandableAddressTableBuffer,
+                      sparseTableBlockSize, sparseTableDataSize), mIsValid(true) {}
+
+    virtual ~SparseTableDictContent() {}
+
+    virtual bool isValid() const {
+        return mIsValid;
+    }
+
+    bool isNearSizeLimit() const {
+        return mExpandableLookupTableBuffer.isNearSizeLimit()
+                || mExpandableAddressTableBuffer.isNearSizeLimit()
+                || mExpandableContentBuffer.isNearSizeLimit();
+    }
+
+ protected:
+    SparseTable *getUpdatableAddressLookupTable() {
+        return &mAddressLookupTable;
+    }
+
+    const SparseTable *getAddressLookupTable() const {
+        return &mAddressLookupTable;
+    }
+
+    BufferWithExtendableBuffer *getWritableContentBuffer() {
+        return &mExpandableContentBuffer;
+    }
+
+    const BufferWithExtendableBuffer *getContentBuffer() const {
+        return &mExpandableContentBuffer;
+    }
+
+    bool flush(const char *const dictDirPath, const char *const lookupTableFileName,
+            const char *const addressTableFileName, const char *const contentFileName) const;
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(SparseTableDictContent);
+
+    const MmappedBuffer::MmappedBufferPtr mLookupTableBuffer;
+    const MmappedBuffer::MmappedBufferPtr mAddressTableBuffer;
+    const MmappedBuffer::MmappedBufferPtr mContentBuffer;
+    BufferWithExtendableBuffer mExpandableLookupTableBuffer;
+    BufferWithExtendableBuffer mExpandableAddressTableBuffer;
+    BufferWithExtendableBuffer mExpandableContentBuffer;
+    SparseTable mAddressLookupTable;
+    const bool mIsValid;
+};
+} // namespace latinime
+#endif /* LATINIME_SPARSE_TABLE_DICT_CONTENT_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.cpp
new file mode 100644
index 0000000..0b17a00
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+int TerminalPositionLookupTable::getTerminalPtNodePosition(const int terminalId) const {
+    if (terminalId < 0 || terminalId >= mSize) {
+        return NOT_A_DICT_POS;
+    }
+    const int terminalPos = getBuffer()->readUint(
+            Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(terminalId));
+    return (terminalPos == Ver4DictConstants::NOT_A_TERMINAL_ADDRESS) ?
+            NOT_A_DICT_POS : terminalPos;
+}
+
+bool TerminalPositionLookupTable::setTerminalPtNodePosition(
+        const int terminalId, const int terminalPtNodePos) {
+    if (terminalId < 0) {
+        return NOT_A_DICT_POS;
+    }
+    while (terminalId >= mSize) {
+        // Write new entry.
+        if (!getWritableBuffer()->writeUint(Ver4DictConstants::NOT_A_TERMINAL_ADDRESS,
+                Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(mSize))) {
+            return false;
+        }
+        mSize++;
+    }
+    const int terminalPos = (terminalPtNodePos != NOT_A_DICT_POS) ?
+            terminalPtNodePos : Ver4DictConstants::NOT_A_TERMINAL_ADDRESS;
+    return getWritableBuffer()->writeUint(terminalPos,
+            Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(terminalId));
+}
+
+bool TerminalPositionLookupTable::flushToFile(const char *const dictPath) const {
+    // If the used buffer size is smaller than the actual buffer size, regenerate the lookup
+    // table and write the new table to the file.
+    if (getEntryPos(mSize) < getBuffer()->getTailPosition()) {
+        TerminalPositionLookupTable lookupTableToWrite;
+        for (int i = 0; i < mSize; ++i) {
+            const int terminalPtNodePosition = getTerminalPtNodePosition(i);
+            if (!lookupTableToWrite.setTerminalPtNodePosition(i, terminalPtNodePosition)) {
+                AKLOGE("Cannot set terminal position to lookupTableToWrite."
+                        " terminalId: %d, position: %d", i, terminalPtNodePosition);
+                return false;
+            }
+        }
+        return lookupTableToWrite.flush(dictPath,
+                Ver4DictConstants::TERMINAL_ADDRESS_TABLE_FILE_EXTENSION);
+    } else {
+        // We can simply use this lookup table because the buffer size has not been
+        // changed.
+        return flush(dictPath, Ver4DictConstants::TERMINAL_ADDRESS_TABLE_FILE_EXTENSION);
+    }
+}
+
+bool TerminalPositionLookupTable::runGCTerminalIds(TerminalIdMap *const terminalIdMap) {
+    int removedEntryCount = 0;
+    int nextNewTerminalId = 0;
+    for (int i = 0; i < mSize; ++i) {
+        const int terminalPos = getBuffer()->readUint(
+                Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE, getEntryPos(i));
+        if (terminalPos == Ver4DictConstants::NOT_A_TERMINAL_ADDRESS) {
+            // This entry is a garbage.
+            removedEntryCount++;
+        } else {
+            // Give a new terminal id to the entry.
+            if (!getWritableBuffer()->writeUint(terminalPos,
+                    Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE,
+                    getEntryPos(nextNewTerminalId))) {
+                return false;
+            }
+            // Memorize the mapping to the old terminal id to the new terminal id.
+            terminalIdMap->insert(TerminalIdMap::value_type(i, nextNewTerminalId));
+            nextNewTerminalId++;
+        }
+    }
+    mSize = nextNewTerminalId;
+    return true;
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h
new file mode 100644
index 0000000..f73e227
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_TERMINAL_POSITION_LOOKUP_TABLE_H
+#define LATINIME_TERMINAL_POSITION_LOOKUP_TABLE_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/single_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "utils/hash_map_compat.h"
+
+namespace latinime {
+
+class TerminalPositionLookupTable : public SingleDictContent {
+ public:
+    typedef hash_map_compat<int, int> TerminalIdMap;
+
+    TerminalPositionLookupTable(const char *const dictPath, const bool isUpdatable)
+            : SingleDictContent(dictPath,
+                      Ver4DictConstants::TERMINAL_ADDRESS_TABLE_FILE_EXTENSION, isUpdatable),
+              mSize(getBuffer()->getTailPosition()
+                      / Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE) {}
+
+    TerminalPositionLookupTable() : mSize(0) {}
+
+    int getTerminalPtNodePosition(const int terminalId) const;
+
+    bool setTerminalPtNodePosition(const int terminalId, const int terminalPtNodePos);
+
+    int getNextTerminalId() const {
+        return mSize;
+    }
+
+    bool flushToFile(const char *const dictPath) const;
+
+    bool runGCTerminalIds(TerminalIdMap *const terminalIdMap);
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(TerminalPositionLookupTable);
+
+    int getEntryPos(const int terminalId) const {
+        return terminalId * Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE;
+    }
+
+    int mSize;
+};
+} // namespace latinime
+#endif // LATINIME_TERMINAL_POSITION_LOOKUP_TABLE_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
new file mode 100644
index 0000000..918c02b
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.cpp
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h"
+
+#include <cerrno>
+#include <cstring>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
+#include "suggest/policyimpl/dictionary/utils/file_utils.h"
+
+namespace latinime {
+
+/* static */ Ver4DictBuffers::Ver4DictBuffersPtr Ver4DictBuffers::openVer4DictBuffers(
+        const char *const dictPath, const MmappedBuffer::MmappedBufferPtr &headerBuffer) {
+    const bool isUpdatable = headerBuffer.get() ? headerBuffer.get()->isUpdatable() : false;
+    // TODO: take only dictDirPath, and open both header and trie files in the constructor below
+    return Ver4DictBuffersPtr(new Ver4DictBuffers(dictPath, headerBuffer, isUpdatable));
+}
+
+bool Ver4DictBuffers::flushHeaderAndDictBuffers(const char *const dictDirPath,
+        const BufferWithExtendableBuffer *const headerBuffer) const {
+    // Create temporary directory.
+    const int tmpDirPathBufSize = FileUtils::getFilePathWithSuffixBufSize(dictDirPath,
+            DictFileWritingUtils::TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE);
+    char tmpDirPath[tmpDirPathBufSize];
+    FileUtils::getFilePathWithSuffix(dictDirPath,
+            DictFileWritingUtils::TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE, tmpDirPathBufSize,
+            tmpDirPath);
+    if (FileUtils::existsDir(tmpDirPath)) {
+        if (!FileUtils::removeDirAndFiles(tmpDirPath)) {
+            AKLOGE("Existing directory %s cannot be removed.", tmpDirPath);
+            ASSERT(false);
+            return false;
+        }
+    }
+    if (mkdir(tmpDirPath, S_IRWXU) == -1) {
+        AKLOGE("Cannot create directory: %s. errno: %d.", tmpDirPath, errno);
+        return false;
+    }
+    // Get dictionary base path.
+    const int dictNameBufSize = strlen(dictDirPath) + 1 /* terminator */;
+    char dictName[dictNameBufSize];
+    FileUtils::getBasename(dictDirPath, dictNameBufSize, dictName);
+    const int dictPathBufSize = FileUtils::getFilePathBufSize(tmpDirPath, dictName);
+    char dictPath[dictPathBufSize];
+    FileUtils::getFilePath(tmpDirPath, dictName, dictPathBufSize, dictPath);
+
+    // Write header file.
+    if (!DictFileWritingUtils::flushBufferToFileWithSuffix(dictPath,
+            Ver4DictConstants::HEADER_FILE_EXTENSION, headerBuffer)) {
+        AKLOGE("Dictionary header file %s%s cannot be written.", tmpDirPath,
+                Ver4DictConstants::HEADER_FILE_EXTENSION);
+        return false;
+    }
+    // Write trie file.
+    if (!DictFileWritingUtils::flushBufferToFileWithSuffix(dictPath,
+            Ver4DictConstants::TRIE_FILE_EXTENSION, &mExpandableTrieBuffer)) {
+        AKLOGE("Dictionary trie file %s%s cannot be written.", tmpDirPath,
+                Ver4DictConstants::TRIE_FILE_EXTENSION);
+        return false;
+    }
+    // Write dictionary contents.
+    if (!mTerminalPositionLookupTable.flushToFile(dictPath)) {
+        AKLOGE("Terminal position lookup table cannot be written. %s", tmpDirPath);
+        return false;
+    }
+    if (!mProbabilityDictContent.flushToFile(dictPath)) {
+        AKLOGE("Probability dict content cannot be written. %s", tmpDirPath);
+        return false;
+    }
+    if (!mBigramDictContent.flushToFile(dictPath)) {
+        AKLOGE("Bigram dict content cannot be written. %s", tmpDirPath);
+        return false;
+    }
+    if (!mShortcutDictContent.flushToFile(dictPath)) {
+        AKLOGE("Shortcut dict content cannot be written. %s", tmpDirPath);
+        return false;
+    }
+    // Remove existing dictionary.
+    if (!FileUtils::removeDirAndFiles(dictDirPath)) {
+        AKLOGE("Existing directory %s cannot be removed.", dictDirPath);
+        ASSERT(false);
+        return false;
+    }
+    // Rename temporary directory.
+    if (rename(tmpDirPath, dictDirPath) != 0) {
+        AKLOGE("%s cannot be renamed to %s", tmpDirPath, dictDirPath);
+        ASSERT(false);
+        return false;
+    }
+    return true;
+}
+
+Ver4DictBuffers::Ver4DictBuffers(const char *const dictPath,
+        const MmappedBuffer::MmappedBufferPtr &headerBuffer, const bool isUpdatable)
+        : mHeaderBuffer(headerBuffer),
+          mDictBuffer(MmappedBuffer::openBuffer(dictPath,
+                  Ver4DictConstants::TRIE_FILE_EXTENSION, isUpdatable)),
+          mHeaderPolicy(headerBuffer.get()->getBuffer(), FormatUtils::VERSION_4),
+          mExpandableHeaderBuffer(headerBuffer.get()->getBuffer(), mHeaderPolicy.getSize(),
+                  BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
+          mExpandableTrieBuffer(mDictBuffer.get()->getBuffer(),
+                  mDictBuffer.get()->getBufferSize(),
+                  BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
+          mTerminalPositionLookupTable(dictPath, isUpdatable),
+          mProbabilityDictContent(dictPath, mHeaderPolicy.hasHistoricalInfoOfWords(),
+                  isUpdatable),
+          mBigramDictContent(dictPath, mHeaderPolicy.hasHistoricalInfoOfWords(),
+                  isUpdatable),
+          mShortcutDictContent(dictPath, isUpdatable),
+          mIsUpdatable(isUpdatable) {}
+
+Ver4DictBuffers::Ver4DictBuffers(const HeaderPolicy *const headerPolicy)
+        : mHeaderBuffer(0), mDictBuffer(0), mHeaderPolicy(),
+          mExpandableHeaderBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
+          mExpandableTrieBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
+          mTerminalPositionLookupTable(),
+          mProbabilityDictContent(headerPolicy->hasHistoricalInfoOfWords()),
+          mBigramDictContent(headerPolicy->hasHistoricalInfoOfWords()), mShortcutDictContent(),
+          mIsUpdatable(true) {}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
new file mode 100644
index 0000000..a0c219e
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_DICT_BUFFER_H
+#define LATINIME_VER4_DICT_BUFFER_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/header/header_policy.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+
+namespace latinime {
+
+class Ver4DictBuffers {
+ public:
+    typedef ExclusiveOwnershipPointer<Ver4DictBuffers> Ver4DictBuffersPtr;
+
+    static Ver4DictBuffersPtr openVer4DictBuffers(const char *const dictDirPath,
+            const MmappedBuffer::MmappedBufferPtr &headerBuffer);
+
+    static AK_FORCE_INLINE Ver4DictBuffersPtr createVer4DictBuffers(
+            const HeaderPolicy *const headerPolicy) {
+        return Ver4DictBuffersPtr(new Ver4DictBuffers(headerPolicy));
+    }
+
+    AK_FORCE_INLINE bool isValid() const {
+        return mDictBuffer.get() != 0 && mHeaderPolicy.isValid()
+                && mProbabilityDictContent.isValid() && mTerminalPositionLookupTable.isValid()
+                && mBigramDictContent.isValid() && mShortcutDictContent.isValid();
+    }
+
+    AK_FORCE_INLINE bool isNearSizeLimit() const {
+        return mExpandableTrieBuffer.isNearSizeLimit()
+                || mTerminalPositionLookupTable.isNearSizeLimit()
+                || mProbabilityDictContent.isNearSizeLimit()
+                || mBigramDictContent.isNearSizeLimit()
+                || mShortcutDictContent.isNearSizeLimit();
+    }
+
+    AK_FORCE_INLINE const HeaderPolicy *getHeaderPolicy() const {
+        return &mHeaderPolicy;
+    }
+
+    AK_FORCE_INLINE BufferWithExtendableBuffer *getWritableHeaderBuffer() {
+        return &mExpandableHeaderBuffer;
+    }
+
+    AK_FORCE_INLINE BufferWithExtendableBuffer *getWritableTrieBuffer() {
+        return &mExpandableTrieBuffer;
+    }
+
+    AK_FORCE_INLINE const BufferWithExtendableBuffer *getTrieBuffer() const {
+        return &mExpandableTrieBuffer;
+    }
+
+    AK_FORCE_INLINE TerminalPositionLookupTable *getMutableTerminalPositionLookupTable() {
+        return &mTerminalPositionLookupTable;
+    }
+
+    AK_FORCE_INLINE const TerminalPositionLookupTable *getTerminalPositionLookupTable() const {
+        return &mTerminalPositionLookupTable;
+    }
+
+    AK_FORCE_INLINE ProbabilityDictContent *getMutableProbabilityDictContent() {
+        return &mProbabilityDictContent;
+    }
+
+    AK_FORCE_INLINE const ProbabilityDictContent *getProbabilityDictContent() const {
+        return &mProbabilityDictContent;
+    }
+
+    AK_FORCE_INLINE BigramDictContent *getMutableBigramDictContent() {
+        return &mBigramDictContent;
+    }
+
+    AK_FORCE_INLINE const BigramDictContent *getBigramDictContent() const {
+        return &mBigramDictContent;
+    }
+
+    AK_FORCE_INLINE ShortcutDictContent *getMutableShortcutDictContent() {
+        return &mShortcutDictContent;
+    }
+
+    AK_FORCE_INLINE const ShortcutDictContent *getShortcutDictContent() const {
+        return &mShortcutDictContent;
+    }
+
+    AK_FORCE_INLINE bool isUpdatable() const {
+        return mIsUpdatable;
+    }
+
+    bool flush(const char *const dictDirPath) const {
+        return flushHeaderAndDictBuffers(dictDirPath, &mExpandableHeaderBuffer);
+    }
+
+    bool flushHeaderAndDictBuffers(const char *const dictDirPath,
+            const BufferWithExtendableBuffer *const headerBuffer) const;
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(Ver4DictBuffers);
+
+    Ver4DictBuffers(const char *const dictDirPath,
+            const MmappedBuffer::MmappedBufferPtr &headerBuffer, const bool isUpdatable);
+
+    Ver4DictBuffers(const HeaderPolicy *const headerPolicy);
+
+    const MmappedBuffer::MmappedBufferPtr mHeaderBuffer;
+    const MmappedBuffer::MmappedBufferPtr mDictBuffer;
+    const HeaderPolicy mHeaderPolicy;
+    BufferWithExtendableBuffer mExpandableHeaderBuffer;
+    BufferWithExtendableBuffer mExpandableTrieBuffer;
+    TerminalPositionLookupTable mTerminalPositionLookupTable;
+    ProbabilityDictContent mProbabilityDictContent;
+    BigramDictContent mBigramDictContent;
+    ShortcutDictContent mShortcutDictContent;
+    const int mIsUpdatable;
+};
+} // namespace latinime
+#endif /* LATINIME_VER4_DICT_BUFFER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
new file mode 100644
index 0000000..deed010
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.cpp
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+
+namespace latinime {
+
+// These values MUST match the definitions in FormatSpec.java.
+const char *const Ver4DictConstants::TRIE_FILE_EXTENSION = ".trie";
+const char *const Ver4DictConstants::HEADER_FILE_EXTENSION = ".header";
+const char *const Ver4DictConstants::FREQ_FILE_EXTENSION = ".freq";
+// tat = Terminal Address Table
+const char *const Ver4DictConstants::TERMINAL_ADDRESS_TABLE_FILE_EXTENSION = ".tat";
+const char *const Ver4DictConstants::BIGRAM_FILE_EXTENSION = ".bigram_freq";
+const char *const Ver4DictConstants::BIGRAM_LOOKUP_TABLE_FILE_EXTENSION = ".bigram_lookup";
+const char *const Ver4DictConstants::BIGRAM_CONTENT_TABLE_FILE_EXTENSION = ".bigram_index_freq";
+const char *const Ver4DictConstants::SHORTCUT_FILE_EXTENSION = ".shortcut_shortcut";
+const char *const Ver4DictConstants::SHORTCUT_LOOKUP_TABLE_FILE_EXTENSION = ".shortcut_lookup";
+const char *const Ver4DictConstants::SHORTCUT_CONTENT_TABLE_FILE_EXTENSION =
+        ".shortcut_index_shortcut";
+
+// Version 4 dictionary size is implicitly limited to 8MB due to 3-byte offsets.
+const int Ver4DictConstants::MAX_DICTIONARY_SIZE = 8 * 1024 * 1024;
+// Extended region size, which is not GCed region size in dict file + additional buffer size, is
+// limited to 1MB to prevent from inefficient traversing.
+const int Ver4DictConstants::MAX_DICT_EXTENDED_REGION_SIZE = 1 * 1024 * 1024;
+
+const int Ver4DictConstants::NOT_A_TERMINAL_ID = -1;
+const int Ver4DictConstants::PROBABILITY_SIZE = 1;
+const int Ver4DictConstants::FLAGS_IN_PROBABILITY_FILE_SIZE = 1;
+const int Ver4DictConstants::TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE = 3;
+const int Ver4DictConstants::NOT_A_TERMINAL_ADDRESS = 0;
+const int Ver4DictConstants::TERMINAL_ID_FIELD_SIZE = 4;
+const int Ver4DictConstants::TIME_STAMP_FIELD_SIZE = 4;
+const int Ver4DictConstants::WORD_LEVEL_FIELD_SIZE = 1;
+const int Ver4DictConstants::WORD_COUNT_FIELD_SIZE = 1;
+
+const int Ver4DictConstants::BIGRAM_ADDRESS_TABLE_BLOCK_SIZE = 16;
+const int Ver4DictConstants::BIGRAM_ADDRESS_TABLE_DATA_SIZE = 4;
+const int Ver4DictConstants::SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE = 64;
+const int Ver4DictConstants::SHORTCUT_ADDRESS_TABLE_DATA_SIZE = 4;
+
+const int Ver4DictConstants::BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE = 3;
+// Unsigned int max value of BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE-byte is used for representing
+// invalid terminal ID in bigram lists.
+const int Ver4DictConstants::INVALID_BIGRAM_TARGET_TERMINAL_ID =
+        (1 << (BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE * 8)) - 1;
+const int Ver4DictConstants::BIGRAM_FLAGS_FIELD_SIZE = 1;
+const int Ver4DictConstants::BIGRAM_PROBABILITY_MASK = 0x0F;
+const int Ver4DictConstants::BIGRAM_HAS_NEXT_MASK = 0x80;
+const int Ver4DictConstants::BIGRAM_LARGE_PROBABILITY_FIELD_SIZE = 1;
+
+const int Ver4DictConstants::SHORTCUT_FLAGS_FIELD_SIZE = 1;
+const int Ver4DictConstants::SHORTCUT_PROBABILITY_MASK = 0x0F;
+const int Ver4DictConstants::SHORTCUT_HAS_NEXT_MASK = 0x80;
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h
new file mode 100644
index 0000000..d6d22c5
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_DICT_CONSTANTS_H
+#define LATINIME_VER4_DICT_CONSTANTS_H
+
+#include "defines.h"
+
+namespace latinime {
+
+// TODO: Create PtConstants under the pt_common and move some constant values there.
+// Note that there are corresponding definitions in FormatSpec.java.
+class Ver4DictConstants {
+ public:
+    static const char *const TRIE_FILE_EXTENSION;
+    static const char *const HEADER_FILE_EXTENSION;
+    static const char *const FREQ_FILE_EXTENSION;
+    static const char *const TERMINAL_ADDRESS_TABLE_FILE_EXTENSION;
+    static const char *const BIGRAM_FILE_EXTENSION;
+    static const char *const BIGRAM_LOOKUP_TABLE_FILE_EXTENSION;
+    static const char *const BIGRAM_CONTENT_TABLE_FILE_EXTENSION;
+    static const char *const SHORTCUT_FILE_EXTENSION;
+    static const char *const SHORTCUT_LOOKUP_TABLE_FILE_EXTENSION;
+    static const char *const SHORTCUT_CONTENT_TABLE_FILE_EXTENSION;
+
+    static const int MAX_DICTIONARY_SIZE;
+    static const int MAX_DICT_EXTENDED_REGION_SIZE;
+
+    static const int NOT_A_TERMINAL_ID;
+    static const int PROBABILITY_SIZE;
+    static const int FLAGS_IN_PROBABILITY_FILE_SIZE;
+    static const int TERMINAL_ADDRESS_TABLE_ADDRESS_SIZE;
+    static const int NOT_A_TERMINAL_ADDRESS;
+    static const int TERMINAL_ID_FIELD_SIZE;
+    static const int TIME_STAMP_FIELD_SIZE;
+    static const int WORD_LEVEL_FIELD_SIZE;
+    static const int WORD_COUNT_FIELD_SIZE;
+
+    static const int BIGRAM_ADDRESS_TABLE_BLOCK_SIZE;
+    static const int BIGRAM_ADDRESS_TABLE_DATA_SIZE;
+    static const int SHORTCUT_ADDRESS_TABLE_BLOCK_SIZE;
+    static const int SHORTCUT_ADDRESS_TABLE_DATA_SIZE;
+
+    static const int BIGRAM_FLAGS_FIELD_SIZE;
+    static const int BIGRAM_TARGET_TERMINAL_ID_FIELD_SIZE;
+    static const int INVALID_BIGRAM_TARGET_TERMINAL_ID;
+    static const int BIGRAM_PROBABILITY_MASK;
+    static const int BIGRAM_HAS_NEXT_MASK;
+    // Used when bigram list has time stamp.
+    static const int BIGRAM_LARGE_PROBABILITY_FIELD_SIZE;
+
+    static const int SHORTCUT_FLAGS_FIELD_SIZE;
+    static const int SHORTCUT_PROBABILITY_MASK;
+    static const int SHORTCUT_HAS_NEXT_MASK;
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(Ver4DictConstants);
+};
+} // namespace latinime
+#endif /* LATINIME_VER4_DICT_CONSTANTS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.cpp
new file mode 100644
index 0000000..17fc948
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h"
+
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
+
+namespace latinime {
+
+const PtNodeParams Ver4PatriciaTrieNodeReader::fetchPtNodeInfoFromBufferAndProcessMovedPtNode(
+        const int ptNodePos, const int siblingNodePos) const {
+    if (ptNodePos < 0 || ptNodePos >= mBuffer->getTailPosition()) {
+        // Reading invalid position because of bug or broken dictionary.
+        AKLOGE("Fetching PtNode info from invalid dictionary position: %d, dictionary size: %d",
+                ptNodePos, mBuffer->getTailPosition());
+        ASSERT(false);
+        return PtNodeParams();
+    }
+    const bool usesAdditionalBuffer = mBuffer->isInAdditionalBuffer(ptNodePos);
+    const uint8_t *const dictBuf = mBuffer->getBuffer(usesAdditionalBuffer);
+    int pos = ptNodePos;
+    const int headPos = ptNodePos;
+    if (usesAdditionalBuffer) {
+        pos -= mBuffer->getOriginalBufferSize();
+    }
+    const PatriciaTrieReadingUtils::NodeFlags flags =
+            PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(dictBuf, &pos);
+    const int parentPosOffset =
+            DynamicPtReadingUtils::getParentPtNodePosOffsetAndAdvancePosition(
+                    dictBuf, &pos);
+    const int parentPos =
+            DynamicPtReadingUtils::getParentPtNodePos(parentPosOffset, headPos);
+    int codePoints[MAX_WORD_LENGTH];
+    const int codePonitCount = PatriciaTrieReadingUtils::getCharsAndAdvancePosition(
+            dictBuf, flags, MAX_WORD_LENGTH, codePoints, &pos);
+    int terminalIdFieldPos = NOT_A_DICT_POS;
+    int terminalId = Ver4DictConstants::NOT_A_TERMINAL_ID;
+    int probability = NOT_A_PROBABILITY;
+    if (PatriciaTrieReadingUtils::isTerminal(flags)) {
+        terminalIdFieldPos = pos;
+        if (usesAdditionalBuffer) {
+            terminalIdFieldPos += mBuffer->getOriginalBufferSize();
+        }
+        terminalId = Ver4PatriciaTrieReadingUtils::getTerminalIdAndAdvancePosition(dictBuf, &pos);
+        const ProbabilityEntry probabilityEntry =
+                mProbabilityDictContent->getProbabilityEntry(terminalId);
+        if (probabilityEntry.hasHistoricalInfo()) {
+            probability = ForgettingCurveUtils::decodeProbability(
+                    probabilityEntry.getHistoricalInfo());
+        } else {
+            probability = probabilityEntry.getProbability();
+        }
+    }
+    int childrenPosFieldPos = pos;
+    if (usesAdditionalBuffer) {
+        childrenPosFieldPos += mBuffer->getOriginalBufferSize();
+    }
+    int childrenPos = DynamicPtReadingUtils::readChildrenPositionAndAdvancePosition(
+            dictBuf, &pos);
+    if (usesAdditionalBuffer && childrenPos != NOT_A_DICT_POS) {
+        childrenPos += mBuffer->getOriginalBufferSize();
+    }
+    if (usesAdditionalBuffer) {
+        pos += mBuffer->getOriginalBufferSize();
+    }
+    // Sibling position is the tail position of original PtNode.
+    int newSiblingNodePos = (siblingNodePos == NOT_A_DICT_POS) ? pos : siblingNodePos;
+    // Read destination node if the read node is a moved node.
+    if (DynamicPtReadingUtils::isMoved(flags)) {
+        // The destination position is stored at the same place as the parent position.
+        return fetchPtNodeInfoFromBufferAndProcessMovedPtNode(parentPos, newSiblingNodePos);
+    } else {
+        return PtNodeParams(headPos, flags, parentPos, codePonitCount, codePoints,
+                terminalIdFieldPos, terminalId, probability, childrenPosFieldPos, childrenPos,
+                newSiblingNodePos);
+    }
+}
+
+}
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h
new file mode 100644
index 0000000..9d93245
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_PATRICIA_TRIE_NODE_READER_H
+#define LATINIME_VER4_PATRICIA_TRIE_NODE_READER_H
+
+#include <stdint.h>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_reader.h"
+
+namespace latinime {
+
+class BufferWithExtendableBuffer;
+class ProbabilityDictContent;
+
+/*
+ * This class is used for helping to read nodes of ver4 patricia trie. This class handles moved
+ * node and reads node attributes including probability form probabilityBuffer.
+ */
+class Ver4PatriciaTrieNodeReader : public PtNodeReader {
+ public:
+    Ver4PatriciaTrieNodeReader(const BufferWithExtendableBuffer *const buffer,
+            const ProbabilityDictContent *const probabilityDictContent)
+            : mBuffer(buffer), mProbabilityDictContent(probabilityDictContent) {}
+
+    ~Ver4PatriciaTrieNodeReader() {}
+
+    virtual const PtNodeParams fetchNodeInfoInBufferFromPtNodePos(const int ptNodePos) const {
+        return fetchPtNodeInfoFromBufferAndProcessMovedPtNode(ptNodePos,
+                NOT_A_DICT_POS /* siblingNodePos */);
+    }
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(Ver4PatriciaTrieNodeReader);
+
+    const BufferWithExtendableBuffer *const mBuffer;
+    const ProbabilityDictContent *const mProbabilityDictContent;
+
+    const PtNodeParams fetchPtNodeInfoFromBufferAndProcessMovedPtNode(const int ptNodePos,
+            const int siblingNodePos) const;
+};
+} // namespace latinime
+#endif /* LATINIME_VER4_PATRICIA_TRIE_NODE_READER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
new file mode 100644
index 0000000..32576cf
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
@@ -0,0 +1,411 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h"
+
+#include "suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.h"
+#include "suggest/policyimpl/dictionary/header/header_policy.h"
+#include "suggest/policyimpl/dictionary/shortcut/ver4_shortcut_list_policy.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v2/patricia_trie_reading_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
+
+namespace latinime {
+
+const int Ver4PatriciaTrieNodeWriter::CHILDREN_POSITION_FIELD_SIZE = 3;
+
+bool Ver4PatriciaTrieNodeWriter::markPtNodeAsDeleted(
+        const PtNodeParams *const toBeUpdatedPtNodeParams) {
+    int pos = toBeUpdatedPtNodeParams->getHeadPos();
+    const bool usesAdditionalBuffer = mTrieBuffer->isInAdditionalBuffer(pos);
+    const uint8_t *const dictBuf = mTrieBuffer->getBuffer(usesAdditionalBuffer);
+    if (usesAdditionalBuffer) {
+        pos -= mTrieBuffer->getOriginalBufferSize();
+    }
+    // Read original flags
+    const PatriciaTrieReadingUtils::NodeFlags originalFlags =
+            PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(dictBuf, &pos);
+    const PatriciaTrieReadingUtils::NodeFlags updatedFlags =
+            DynamicPtReadingUtils::updateAndGetFlags(originalFlags, false /* isMoved */,
+                    true /* isDeleted */, false /* willBecomeNonTerminal */);
+    int writingPos = toBeUpdatedPtNodeParams->getHeadPos();
+    // Update flags.
+    if (!DynamicPtWritingUtils::writeFlagsAndAdvancePosition(mTrieBuffer, updatedFlags,
+            &writingPos)) {
+        return false;
+    }
+    if (toBeUpdatedPtNodeParams->isTerminal()) {
+        // The PtNode is a terminal. Delete entry from the terminal position lookup table.
+        return mBuffers->getMutableTerminalPositionLookupTable()->setTerminalPtNodePosition(
+                toBeUpdatedPtNodeParams->getTerminalId(), NOT_A_DICT_POS /* ptNodePos */);
+    } else {
+        return true;
+    }
+}
+
+bool Ver4PatriciaTrieNodeWriter::markPtNodeAsMoved(
+        const PtNodeParams *const toBeUpdatedPtNodeParams,
+        const int movedPos, const int bigramLinkedNodePos) {
+    int pos = toBeUpdatedPtNodeParams->getHeadPos();
+    const bool usesAdditionalBuffer = mTrieBuffer->isInAdditionalBuffer(pos);
+    const uint8_t *const dictBuf = mTrieBuffer->getBuffer(usesAdditionalBuffer);
+    if (usesAdditionalBuffer) {
+        pos -= mTrieBuffer->getOriginalBufferSize();
+    }
+    // Read original flags
+    const PatriciaTrieReadingUtils::NodeFlags originalFlags =
+            PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(dictBuf, &pos);
+    const PatriciaTrieReadingUtils::NodeFlags updatedFlags =
+            DynamicPtReadingUtils::updateAndGetFlags(originalFlags, true /* isMoved */,
+                    false /* isDeleted */,  false /* willBecomeNonTerminal */);
+    int writingPos = toBeUpdatedPtNodeParams->getHeadPos();
+    // Update flags.
+    if (!DynamicPtWritingUtils::writeFlagsAndAdvancePosition(mTrieBuffer, updatedFlags,
+            &writingPos)) {
+        return false;
+    }
+    // Update moved position, which is stored in the parent offset field.
+    if (!DynamicPtWritingUtils::writeParentPosOffsetAndAdvancePosition(
+            mTrieBuffer, movedPos, toBeUpdatedPtNodeParams->getHeadPos(), &writingPos)) {
+        return false;
+    }
+    if (toBeUpdatedPtNodeParams->hasChildren()) {
+        // Update children's parent position.
+        mReadingHelper.initWithPtNodeArrayPos(toBeUpdatedPtNodeParams->getChildrenPos());
+        while (!mReadingHelper.isEnd()) {
+            const PtNodeParams childPtNodeParams(mReadingHelper.getPtNodeParams());
+            int parentOffsetFieldPos = childPtNodeParams.getHeadPos()
+                    + DynamicPtWritingUtils::NODE_FLAG_FIELD_SIZE;
+            if (!DynamicPtWritingUtils::writeParentPosOffsetAndAdvancePosition(
+                    mTrieBuffer, bigramLinkedNodePos, childPtNodeParams.getHeadPos(),
+                    &parentOffsetFieldPos)) {
+                // Parent offset cannot be written because of a bug or a broken dictionary; thus,
+                // we give up to update dictionary.
+                return false;
+            }
+            mReadingHelper.readNextSiblingNode(childPtNodeParams);
+        }
+    }
+    return true;
+}
+
+bool Ver4PatriciaTrieNodeWriter::markPtNodeAsWillBecomeNonTerminal(
+        const PtNodeParams *const toBeUpdatedPtNodeParams) {
+    int pos = toBeUpdatedPtNodeParams->getHeadPos();
+    const bool usesAdditionalBuffer = mTrieBuffer->isInAdditionalBuffer(pos);
+    const uint8_t *const dictBuf = mTrieBuffer->getBuffer(usesAdditionalBuffer);
+    if (usesAdditionalBuffer) {
+        pos -= mTrieBuffer->getOriginalBufferSize();
+    }
+    // Read original flags
+    const PatriciaTrieReadingUtils::NodeFlags originalFlags =
+            PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(dictBuf, &pos);
+    const PatriciaTrieReadingUtils::NodeFlags updatedFlags =
+            DynamicPtReadingUtils::updateAndGetFlags(originalFlags, false /* isMoved */,
+                    false /* isDeleted */, true /* willBecomeNonTerminal */);
+    if (!mBuffers->getMutableTerminalPositionLookupTable()->setTerminalPtNodePosition(
+            toBeUpdatedPtNodeParams->getTerminalId(), NOT_A_DICT_POS /* ptNodePos */)) {
+        AKLOGE("Cannot update terminal position lookup table. terminal id: %d",
+                toBeUpdatedPtNodeParams->getTerminalId());
+        return false;
+    }
+    // Update flags.
+    int writingPos = toBeUpdatedPtNodeParams->getHeadPos();
+    return DynamicPtWritingUtils::writeFlagsAndAdvancePosition(mTrieBuffer, updatedFlags,
+            &writingPos);
+}
+
+bool Ver4PatriciaTrieNodeWriter::updatePtNodeProbability(
+        const PtNodeParams *const toBeUpdatedPtNodeParams, const int newProbability,
+        const int timestamp) {
+    if (!toBeUpdatedPtNodeParams->isTerminal()) {
+        return false;
+    }
+    const ProbabilityEntry originalProbabilityEntry =
+            mBuffers->getProbabilityDictContent()->getProbabilityEntry(
+                    toBeUpdatedPtNodeParams->getTerminalId());
+    const ProbabilityEntry probabilityEntry = createUpdatedEntryFrom(&originalProbabilityEntry,
+            newProbability, timestamp);
+    return mBuffers->getMutableProbabilityDictContent()->setProbabilityEntry(
+            toBeUpdatedPtNodeParams->getTerminalId(), &probabilityEntry);
+}
+
+bool Ver4PatriciaTrieNodeWriter::updatePtNodeProbabilityAndGetNeedsToKeepPtNodeAfterGC(
+        const PtNodeParams *const toBeUpdatedPtNodeParams, bool *const outNeedsToKeepPtNode) {
+    if (!toBeUpdatedPtNodeParams->isTerminal()) {
+        AKLOGE("updatePtNodeProbabilityAndGetNeedsToSaveForGC is called for non-terminal PtNode.");
+        return false;
+    }
+    const ProbabilityEntry originalProbabilityEntry =
+            mBuffers->getProbabilityDictContent()->getProbabilityEntry(
+                    toBeUpdatedPtNodeParams->getTerminalId());
+    if (originalProbabilityEntry.hasHistoricalInfo()) {
+        const HistoricalInfo historicalInfo = ForgettingCurveUtils::createHistoricalInfoToSave(
+                originalProbabilityEntry.getHistoricalInfo());
+        const ProbabilityEntry probabilityEntry =
+                originalProbabilityEntry.createEntryWithUpdatedHistoricalInfo(&historicalInfo);
+        if (!mBuffers->getMutableProbabilityDictContent()->setProbabilityEntry(
+                toBeUpdatedPtNodeParams->getTerminalId(), &probabilityEntry)) {
+            AKLOGE("Cannot write updated probability entry. terminalId: %d",
+                    toBeUpdatedPtNodeParams->getTerminalId());
+            return false;
+        }
+        const bool isValid = ForgettingCurveUtils::needsToKeep(&historicalInfo);
+        if (!isValid) {
+            if (!markPtNodeAsWillBecomeNonTerminal(toBeUpdatedPtNodeParams)) {
+                AKLOGE("Cannot mark PtNode as willBecomeNonTerminal.");
+                return false;
+            }
+        }
+        *outNeedsToKeepPtNode = isValid;
+    } else {
+        // No need to update probability.
+        *outNeedsToKeepPtNode = true;
+    }
+    return true;
+}
+
+bool Ver4PatriciaTrieNodeWriter::updateChildrenPosition(
+        const PtNodeParams *const toBeUpdatedPtNodeParams, const int newChildrenPosition) {
+    int childrenPosFieldPos = toBeUpdatedPtNodeParams->getChildrenPosFieldPos();
+    return DynamicPtWritingUtils::writeChildrenPositionAndAdvancePosition(mTrieBuffer,
+            newChildrenPosition, &childrenPosFieldPos);
+}
+
+bool Ver4PatriciaTrieNodeWriter::updateTerminalId(const PtNodeParams *const toBeUpdatedPtNodeParams,
+        const int newTerminalId) {
+    return mTrieBuffer->writeUint(newTerminalId, Ver4DictConstants::TERMINAL_ID_FIELD_SIZE,
+            toBeUpdatedPtNodeParams->getTerminalIdFieldPos());
+}
+
+bool Ver4PatriciaTrieNodeWriter::writePtNodeAndAdvancePosition(
+        const PtNodeParams *const ptNodeParams, int *const ptNodeWritingPos) {
+    return writePtNodeAndGetTerminalIdAndAdvancePosition(ptNodeParams, 0 /* outTerminalId */,
+            ptNodeWritingPos);
+}
+
+
+bool Ver4PatriciaTrieNodeWriter::writeNewTerminalPtNodeAndAdvancePosition(
+        const PtNodeParams *const ptNodeParams, const int timestamp, int *const ptNodeWritingPos) {
+    int terminalId = Ver4DictConstants::NOT_A_TERMINAL_ID;
+    if (!writePtNodeAndGetTerminalIdAndAdvancePosition(ptNodeParams, &terminalId,
+            ptNodeWritingPos)) {
+        return false;
+    }
+    // Write probability.
+    ProbabilityEntry newProbabilityEntry;
+    const ProbabilityEntry probabilityEntryToWrite = createUpdatedEntryFrom(
+            &newProbabilityEntry, ptNodeParams->getProbability(), timestamp);
+    return mBuffers->getMutableProbabilityDictContent()->setProbabilityEntry(terminalId,
+            &probabilityEntryToWrite);
+}
+
+bool Ver4PatriciaTrieNodeWriter::addNewBigramEntry(
+        const PtNodeParams *const sourcePtNodeParams,
+        const PtNodeParams *const targetPtNodeParam, const int probability, const int timestamp,
+        bool *const outAddedNewBigram) {
+    if (!mBigramPolicy->addNewEntry(sourcePtNodeParams->getTerminalId(),
+            targetPtNodeParam->getTerminalId(), probability, timestamp, outAddedNewBigram)) {
+        AKLOGE("Cannot add new bigram entry. terminalId: %d, targetTerminalId: %d",
+                sourcePtNodeParams->getTerminalId(), targetPtNodeParam->getTerminalId());
+        return false;
+    }
+    if (!sourcePtNodeParams->hasBigrams()) {
+        // Update has bigrams flag.
+        return updatePtNodeFlags(sourcePtNodeParams->getHeadPos(),
+                sourcePtNodeParams->isBlacklisted(), sourcePtNodeParams->isNotAWord(),
+                sourcePtNodeParams->isTerminal(), sourcePtNodeParams->hasShortcutTargets(),
+                true /* hasBigrams */,
+                sourcePtNodeParams->getCodePointCount() > 1 /* hasMultipleChars */);
+    }
+    return true;
+}
+
+bool Ver4PatriciaTrieNodeWriter::removeBigramEntry(
+        const PtNodeParams *const sourcePtNodeParams, const PtNodeParams *const targetPtNodeParam) {
+    return mBigramPolicy->removeEntry(sourcePtNodeParams->getTerminalId(),
+            targetPtNodeParam->getTerminalId());
+}
+
+bool Ver4PatriciaTrieNodeWriter::updateAllBigramEntriesAndDeleteUselessEntries(
+            const PtNodeParams *const sourcePtNodeParams, int *const outBigramEntryCount) {
+    return mBigramPolicy->updateAllBigramEntriesAndDeleteUselessEntries(
+            sourcePtNodeParams->getTerminalId(), outBigramEntryCount);
+}
+
+bool Ver4PatriciaTrieNodeWriter::updateAllPositionFields(
+        const PtNodeParams *const toBeUpdatedPtNodeParams,
+        const DictPositionRelocationMap *const dictPositionRelocationMap,
+        int *const outBigramEntryCount) {
+    int parentPos = toBeUpdatedPtNodeParams->getParentPos();
+    if (parentPos != NOT_A_DICT_POS) {
+        PtNodeWriter::PtNodePositionRelocationMap::const_iterator it =
+                dictPositionRelocationMap->mPtNodePositionRelocationMap.find(parentPos);
+        if (it != dictPositionRelocationMap->mPtNodePositionRelocationMap.end()) {
+            parentPos = it->second;
+        }
+    }
+    int writingPos = toBeUpdatedPtNodeParams->getHeadPos()
+            + DynamicPtWritingUtils::NODE_FLAG_FIELD_SIZE;
+    // Write updated parent offset.
+    if (!DynamicPtWritingUtils::writeParentPosOffsetAndAdvancePosition(mTrieBuffer,
+            parentPos, toBeUpdatedPtNodeParams->getHeadPos(), &writingPos)) {
+        return false;
+    }
+
+    // Updates children position.
+    int childrenPos = toBeUpdatedPtNodeParams->getChildrenPos();
+    if (childrenPos != NOT_A_DICT_POS) {
+        PtNodeWriter::PtNodeArrayPositionRelocationMap::const_iterator it =
+                dictPositionRelocationMap->mPtNodeArrayPositionRelocationMap.find(childrenPos);
+        if (it != dictPositionRelocationMap->mPtNodeArrayPositionRelocationMap.end()) {
+            childrenPos = it->second;
+        }
+    }
+    if (!updateChildrenPosition(toBeUpdatedPtNodeParams, childrenPos)) {
+        return false;
+    }
+
+    // Counts bigram entries.
+    if (outBigramEntryCount) {
+        *outBigramEntryCount = mBigramPolicy->getBigramEntryConut(
+                toBeUpdatedPtNodeParams->getTerminalId());
+    }
+    return true;
+}
+
+bool Ver4PatriciaTrieNodeWriter::addShortcutTarget(const PtNodeParams *const ptNodeParams,
+        const int *const targetCodePoints, const int targetCodePointCount,
+        const int shortcutProbability) {
+    if (!mShortcutPolicy->addNewShortcut(ptNodeParams->getTerminalId(),
+            targetCodePoints, targetCodePointCount, shortcutProbability)) {
+        AKLOGE("Cannot add new shortuct entry. terminalId: %d", ptNodeParams->getTerminalId());
+        return false;
+    }
+    if (!ptNodeParams->hasShortcutTargets()) {
+        // Update has shortcut targets flag.
+        return updatePtNodeFlags(ptNodeParams->getHeadPos(),
+                ptNodeParams->isBlacklisted(), ptNodeParams->isNotAWord(),
+                ptNodeParams->isTerminal(), true /* hasShortcutTargets */,
+                ptNodeParams->hasBigrams(),
+                ptNodeParams->getCodePointCount() > 1 /* hasMultipleChars */);
+    }
+    return true;
+}
+
+bool Ver4PatriciaTrieNodeWriter::updatePtNodeHasBigramsAndShortcutTargetsFlags(
+        const PtNodeParams *const ptNodeParams) {
+    const bool hasBigrams = mBuffers->getBigramDictContent()->getBigramListHeadPos(
+            ptNodeParams->getTerminalId()) != NOT_A_DICT_POS;
+    const bool hasShortcutTargets = mBuffers->getShortcutDictContent()->getShortcutListHeadPos(
+            ptNodeParams->getTerminalId()) != NOT_A_DICT_POS;
+    return updatePtNodeFlags(ptNodeParams->getHeadPos(), ptNodeParams->isBlacklisted(),
+            ptNodeParams->isNotAWord(), ptNodeParams->isTerminal(), hasShortcutTargets,
+            hasBigrams, ptNodeParams->getCodePointCount() > 1 /* hasMultipleChars */);
+}
+
+bool Ver4PatriciaTrieNodeWriter::writePtNodeAndGetTerminalIdAndAdvancePosition(
+        const PtNodeParams *const ptNodeParams, int *const outTerminalId,
+        int *const ptNodeWritingPos) {
+    const int nodePos = *ptNodeWritingPos;
+    // Write dummy flags. The Node flags are updated with appropriate flags at the last step of the
+    // PtNode writing.
+    if (!DynamicPtWritingUtils::writeFlagsAndAdvancePosition(mTrieBuffer,
+            0 /* nodeFlags */, ptNodeWritingPos)) {
+        return false;
+    }
+    // Calculate a parent offset and write the offset.
+    if (!DynamicPtWritingUtils::writeParentPosOffsetAndAdvancePosition(mTrieBuffer,
+            ptNodeParams->getParentPos(), nodePos, ptNodeWritingPos)) {
+        return false;
+    }
+    // Write code points
+    if (!DynamicPtWritingUtils::writeCodePointsAndAdvancePosition(mTrieBuffer,
+            ptNodeParams->getCodePoints(), ptNodeParams->getCodePointCount(), ptNodeWritingPos)) {
+        return false;
+    }
+    int terminalId = Ver4DictConstants::NOT_A_TERMINAL_ID;
+    if (!ptNodeParams->willBecomeNonTerminal()) {
+        if (ptNodeParams->getTerminalId() != Ver4DictConstants::NOT_A_TERMINAL_ID) {
+            terminalId = ptNodeParams->getTerminalId();
+        } else if (ptNodeParams->isTerminal()) {
+            // Write terminal information using a new terminal id.
+            // Get a new unused terminal id.
+            terminalId = mBuffers->getTerminalPositionLookupTable()->getNextTerminalId();
+        }
+    }
+    const int isTerminal = terminalId != Ver4DictConstants::NOT_A_TERMINAL_ID;
+    if (isTerminal) {
+        // Update the lookup table.
+        if (!mBuffers->getMutableTerminalPositionLookupTable()->setTerminalPtNodePosition(
+                terminalId, nodePos)) {
+            return false;
+        }
+        // Write terminal Id.
+        if (!mTrieBuffer->writeUintAndAdvancePosition(terminalId,
+                Ver4DictConstants::TERMINAL_ID_FIELD_SIZE, ptNodeWritingPos)) {
+            return false;
+        }
+        if (outTerminalId) {
+            *outTerminalId = terminalId;
+        }
+    }
+    // Write children position
+    if (!DynamicPtWritingUtils::writeChildrenPositionAndAdvancePosition(mTrieBuffer,
+            ptNodeParams->getChildrenPos(), ptNodeWritingPos)) {
+        return false;
+    }
+    return updatePtNodeFlags(nodePos, ptNodeParams->isBlacklisted(), ptNodeParams->isNotAWord(),
+            isTerminal, ptNodeParams->hasShortcutTargets(), ptNodeParams->hasBigrams(),
+            ptNodeParams->getCodePointCount() > 1 /* hasMultipleChars */);
+}
+
+const ProbabilityEntry Ver4PatriciaTrieNodeWriter::createUpdatedEntryFrom(
+        const ProbabilityEntry *const originalProbabilityEntry, const int newProbability,
+        const int timestamp) const {
+    // TODO: Consolidate historical info and probability.
+    if (mBuffers->getHeaderPolicy()->hasHistoricalInfoOfWords()) {
+        const HistoricalInfo updatedHistoricalInfo =
+                ForgettingCurveUtils::createUpdatedHistoricalInfo(
+                        originalProbabilityEntry->getHistoricalInfo(), newProbability, timestamp);
+        return originalProbabilityEntry->createEntryWithUpdatedHistoricalInfo(
+                &updatedHistoricalInfo);
+    } else {
+        return originalProbabilityEntry->createEntryWithUpdatedProbability(newProbability);
+    }
+}
+
+bool Ver4PatriciaTrieNodeWriter::updatePtNodeFlags(const int ptNodePos,
+        const bool isBlacklisted, const bool isNotAWord, const bool isTerminal,
+        const bool hasShortcutTargets, const bool hasBigrams, const bool hasMultipleChars) {
+    // Create node flags and write them.
+    PatriciaTrieReadingUtils::NodeFlags nodeFlags =
+            PatriciaTrieReadingUtils::createAndGetFlags(isBlacklisted, isNotAWord, isTerminal,
+                    hasShortcutTargets, hasBigrams, hasMultipleChars,
+                    CHILDREN_POSITION_FIELD_SIZE);
+    if (!DynamicPtWritingUtils::writeFlags(mTrieBuffer, nodeFlags, ptNodePos)) {
+        AKLOGE("Cannot write PtNode flags. flags: %x, pos: %d", nodeFlags, ptNodePos);
+        return false;
+    }
+    return true;
+}
+
+}
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h
new file mode 100644
index 0000000..69576d8
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_PATRICIA_TRIE_NODE_WRITER_H
+#define LATINIME_VER4_PATRICIA_TRIE_NODE_WRITER_H
+
+#include <stdint.h>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_params.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/pt_node_writer.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/probability_entry.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h"
+
+namespace latinime {
+
+class BufferWithExtendableBuffer;
+class Ver4BigramListPolicy;
+class Ver4DictBuffers;
+class Ver4ShortcutListPolicy;
+
+/*
+ * This class is used for helping to writes nodes of ver4 patricia trie.
+ */
+class Ver4PatriciaTrieNodeWriter : public PtNodeWriter {
+ public:
+    Ver4PatriciaTrieNodeWriter(BufferWithExtendableBuffer *const trieBuffer,
+            Ver4DictBuffers *const buffers, const Ver4PatriciaTrieNodeReader *const ptNodeReader,
+            Ver4BigramListPolicy *const bigramPolicy, Ver4ShortcutListPolicy *const shortcutPolicy)
+            : mTrieBuffer(trieBuffer), mBuffers(buffers), mPtNodeReader(ptNodeReader),
+              mReadingHelper(mTrieBuffer, mPtNodeReader),
+              mBigramPolicy(bigramPolicy), mShortcutPolicy(shortcutPolicy) {}
+
+    virtual ~Ver4PatriciaTrieNodeWriter() {}
+
+    virtual bool markPtNodeAsDeleted(const PtNodeParams *const toBeUpdatedPtNodeParams);
+
+    virtual bool markPtNodeAsMoved(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const int movedPos, const int bigramLinkedNodePos);
+
+    virtual bool markPtNodeAsWillBecomeNonTerminal(
+            const PtNodeParams *const toBeUpdatedPtNodeParams);
+
+    virtual bool updatePtNodeProbability(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const int newProbability, const int timestamp);
+
+    virtual bool updatePtNodeProbabilityAndGetNeedsToKeepPtNodeAfterGC(
+            const PtNodeParams *const toBeUpdatedPtNodeParams, bool *const outNeedsToKeepPtNode);
+
+    virtual bool updateChildrenPosition(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const int newChildrenPosition);
+
+    bool updateTerminalId(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const int newTerminalId);
+
+    virtual bool writePtNodeAndAdvancePosition(const PtNodeParams *const ptNodeParams,
+            int *const ptNodeWritingPos);
+
+    virtual bool writeNewTerminalPtNodeAndAdvancePosition(const PtNodeParams *const ptNodeParams,
+            const int timestamp, int *const ptNodeWritingPos);
+
+    virtual bool addNewBigramEntry(const PtNodeParams *const sourcePtNodeParams,
+            const PtNodeParams *const targetPtNodeParam, const int probability, const int timestamp,
+            bool *const outAddedNewBigram);
+
+    virtual bool removeBigramEntry(const PtNodeParams *const sourcePtNodeParams,
+            const PtNodeParams *const targetPtNodeParam);
+
+    virtual bool updateAllBigramEntriesAndDeleteUselessEntries(
+            const PtNodeParams *const sourcePtNodeParams, int *const outBigramEntryCount);
+
+    virtual bool updateAllPositionFields(const PtNodeParams *const toBeUpdatedPtNodeParams,
+            const DictPositionRelocationMap *const dictPositionRelocationMap,
+            int *const outBigramEntryCount);
+
+    virtual bool addShortcutTarget(const PtNodeParams *const ptNodeParams,
+            const int *const targetCodePoints, const int targetCodePointCount,
+            const int shortcutProbability);
+
+    bool updatePtNodeHasBigramsAndShortcutTargetsFlags(const PtNodeParams *const ptNodeParams);
+
+ private:
+    DISALLOW_COPY_AND_ASSIGN(Ver4PatriciaTrieNodeWriter);
+
+    bool writePtNodeAndGetTerminalIdAndAdvancePosition(
+            const PtNodeParams *const ptNodeParams, int *const outTerminalId,
+            int *const ptNodeWritingPos);
+
+    // Create updated probability entry using given probability and timestamp. In addition to the
+    // probability, this method updates historical information if needed.
+    const ProbabilityEntry createUpdatedEntryFrom(
+            const ProbabilityEntry *const originalProbabilityEntry, const int newProbability,
+            const int timestamp) const;
+
+    bool updatePtNodeFlags(const int ptNodePos, const bool isBlacklisted, const bool isNotAWord,
+            const bool isTerminal, const bool hasShortcutTargets, const bool hasBigrams,
+            const bool hasMultipleChars);
+
+    static const int CHILDREN_POSITION_FIELD_SIZE;
+
+    BufferWithExtendableBuffer *const mTrieBuffer;
+    Ver4DictBuffers *const mBuffers;
+    const Ver4PatriciaTrieNodeReader *const mPtNodeReader;
+    DynamicPtReadingHelper mReadingHelper;
+    Ver4BigramListPolicy *const mBigramPolicy;
+    Ver4ShortcutListPolicy *const mShortcutPolicy;
+};
+} // namespace latinime
+#endif /* LATINIME_VER4_PATRICIA_TRIE_NODE_WRITER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
new file mode 100644
index 0000000..96bb812
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
@@ -0,0 +1,352 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h"
+
+#include <vector>
+
+#include "suggest/core/dicnode/dic_node.h"
+#include "suggest/core/dicnode/dic_node_vector.h"
+#include "suggest/core/dictionary/unigram_property.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h"
+#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
+#include "suggest/policyimpl/dictionary/utils/probability_utils.h"
+
+namespace latinime {
+
+// Note that there are corresponding definitions in Java side in BinaryDictionaryTests and
+// BinaryDictionaryDecayingTests.
+const char *const Ver4PatriciaTriePolicy::UNIGRAM_COUNT_QUERY = "UNIGRAM_COUNT";
+const char *const Ver4PatriciaTriePolicy::BIGRAM_COUNT_QUERY = "BIGRAM_COUNT";
+const char *const Ver4PatriciaTriePolicy::MAX_UNIGRAM_COUNT_QUERY = "MAX_UNIGRAM_COUNT";
+const char *const Ver4PatriciaTriePolicy::MAX_BIGRAM_COUNT_QUERY = "MAX_BIGRAM_COUNT";
+const char *const Ver4PatriciaTriePolicy::SET_CURRENT_TIME_FOR_TESTING_QUERY_FORMAT =
+        "SET_CURRENT_TIME_FOR_TESTING:%d";
+const char *const Ver4PatriciaTriePolicy::GET_CURRENT_TIME_QUERY = "GET_CURRENT_TIME";
+const char *const Ver4PatriciaTriePolicy::QUIT_TIMEKEEPER_TEST_MODE_QUERY =
+        "QUIT_TIMEKEEPER_TEST_MODE";
+const int Ver4PatriciaTriePolicy::MARGIN_TO_REFUSE_DYNAMIC_OPERATIONS = 1024;
+const int Ver4PatriciaTriePolicy::MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS =
+        Ver4DictConstants::MAX_DICTIONARY_SIZE - MARGIN_TO_REFUSE_DYNAMIC_OPERATIONS;
+
+void Ver4PatriciaTriePolicy::createAndGetAllChildDicNodes(const DicNode *const dicNode,
+        DicNodeVector *const childDicNodes) const {
+    if (!dicNode->hasChildren()) {
+        return;
+    }
+    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader);
+    readingHelper.initWithPtNodeArrayPos(dicNode->getChildrenPtNodeArrayPos());
+    while (!readingHelper.isEnd()) {
+        const PtNodeParams ptNodeParams = readingHelper.getPtNodeParams();
+        if (!ptNodeParams.isValid()) {
+            break;
+        }
+        bool isTerminal = ptNodeParams.isTerminal() && !ptNodeParams.isDeleted();
+        if (isTerminal && mHeaderPolicy->isDecayingDict()) {
+            // A DecayingDict may have a terminal PtNode that has a terminal DicNode whose
+            // probability is NOT_A_PROBABILITY. In such case, we don't want to treat it as a
+            // valid terminal DicNode.
+            isTerminal = ptNodeParams.getProbability() != NOT_A_PROBABILITY;
+        }
+        childDicNodes->pushLeavingChild(dicNode, ptNodeParams.getHeadPos(),
+                ptNodeParams.getChildrenPos(), ptNodeParams.getProbability(), isTerminal,
+                ptNodeParams.hasChildren(),
+                ptNodeParams.isBlacklisted()
+                        || ptNodeParams.isNotAWord() /* isBlacklistedOrNotAWord */,
+                ptNodeParams.getCodePointCount(), ptNodeParams.getCodePoints());
+        readingHelper.readNextSiblingNode(ptNodeParams);
+    }
+}
+
+int Ver4PatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
+        const int ptNodePos, const int maxCodePointCount, int *const outCodePoints,
+        int *const outUnigramProbability) const {
+    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader);
+    readingHelper.initWithPtNodePos(ptNodePos);
+    return readingHelper.getCodePointsAndProbabilityAndReturnCodePointCount(
+            maxCodePointCount, outCodePoints, outUnigramProbability);
+}
+
+int Ver4PatriciaTriePolicy::getTerminalPtNodePositionOfWord(const int *const inWord,
+        const int length, const bool forceLowerCaseSearch) const {
+    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader);
+    readingHelper.initWithPtNodeArrayPos(getRootPosition());
+    return readingHelper.getTerminalPtNodePositionOfWord(inWord, length, forceLowerCaseSearch);
+}
+
+int Ver4PatriciaTriePolicy::getProbability(const int unigramProbability,
+        const int bigramProbability) const {
+    if (mHeaderPolicy->isDecayingDict()) {
+        // Both probabilities are encoded. Decode them and get probability.
+        return ForgettingCurveUtils::getProbability(unigramProbability, bigramProbability);
+    } else {
+        if (unigramProbability == NOT_A_PROBABILITY) {
+            return NOT_A_PROBABILITY;
+        } else if (bigramProbability == NOT_A_PROBABILITY) {
+            return ProbabilityUtils::backoff(unigramProbability);
+        } else {
+            // bigramProbability is a bigram probability delta.
+            return ProbabilityUtils::computeProbabilityForBigram(unigramProbability,
+                    bigramProbability);
+        }
+    }
+}
+
+int Ver4PatriciaTriePolicy::getUnigramProbabilityOfPtNode(const int ptNodePos) const {
+    if (ptNodePos == NOT_A_DICT_POS) {
+        return NOT_A_PROBABILITY;
+    }
+    const PtNodeParams ptNodeParams(mNodeReader.fetchNodeInfoInBufferFromPtNodePos(ptNodePos));
+    if (ptNodeParams.isDeleted() || ptNodeParams.isBlacklisted() || ptNodeParams.isNotAWord()) {
+        return NOT_A_PROBABILITY;
+    }
+    return getProbability(ptNodeParams.getProbability(), NOT_A_PROBABILITY);
+}
+
+int Ver4PatriciaTriePolicy::getShortcutPositionOfPtNode(const int ptNodePos) const {
+    if (ptNodePos == NOT_A_DICT_POS) {
+        return NOT_A_DICT_POS;
+    }
+    const PtNodeParams ptNodeParams(mNodeReader.fetchNodeInfoInBufferFromPtNodePos(ptNodePos));
+    if (ptNodeParams.isDeleted()) {
+        return NOT_A_DICT_POS;
+    }
+    return mBuffers.get()->getShortcutDictContent()->getShortcutListHeadPos(
+            ptNodeParams.getTerminalId());
+}
+
+int Ver4PatriciaTriePolicy::getBigramsPositionOfPtNode(const int ptNodePos) const {
+    if (ptNodePos == NOT_A_DICT_POS) {
+        return NOT_A_DICT_POS;
+    }
+    const PtNodeParams ptNodeParams(mNodeReader.fetchNodeInfoInBufferFromPtNodePos(ptNodePos));
+    if (ptNodeParams.isDeleted()) {
+        return NOT_A_DICT_POS;
+    }
+    return mBuffers.get()->getBigramDictContent()->getBigramListHeadPos(
+            ptNodeParams.getTerminalId());
+}
+
+bool Ver4PatriciaTriePolicy::addUnigramWord(const int *const word, const int length,
+        const int probability, const int *const shortcutTargetCodePoints, const int shortcutLength,
+        const int shortcutProbability, const bool isNotAWord, const bool isBlacklisted,
+        const int timestamp) {
+    if (!mBuffers.get()->isUpdatable()) {
+        AKLOGI("Warning: addUnigramWord() is called for non-updatable dictionary.");
+        return false;
+    }
+    if (mDictBuffer->getTailPosition() >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS) {
+        AKLOGE("The dictionary is too large to dynamically update. Dictionary size: %d",
+                mDictBuffer->getTailPosition());
+        return false;
+    }
+    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader);
+    readingHelper.initWithPtNodeArrayPos(getRootPosition());
+    bool addedNewUnigram = false;
+    if (mUpdatingHelper.addUnigramWord(&readingHelper, word, length, probability, isNotAWord,
+            isBlacklisted, timestamp,  &addedNewUnigram)) {
+        if (addedNewUnigram) {
+            mUnigramCount++;
+        }
+        if (shortcutLength > 0) {
+            // Add shortcut target.
+            const int wordPos = getTerminalPtNodePositionOfWord(word, length,
+                    false /* forceLowerCaseSearch */);
+            if (wordPos == NOT_A_DICT_POS) {
+                AKLOGE("Cannot find terminal PtNode position to add shortcut target.");
+                return false;
+            }
+            if (!mUpdatingHelper.addShortcutTarget(wordPos, shortcutTargetCodePoints,
+                    shortcutLength, shortcutProbability)) {
+                AKLOGE("Cannot add new shortcut target. PtNodePos: %d, length: %d, probability: %d",
+                        wordPos, shortcutLength, shortcutProbability);
+                return false;
+            }
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool Ver4PatriciaTriePolicy::addBigramWords(const int *const word0, const int length0,
+        const int *const word1, const int length1, const int probability,
+        const int timestamp) {
+    if (!mBuffers.get()->isUpdatable()) {
+        AKLOGI("Warning: addBigramWords() is called for non-updatable dictionary.");
+        return false;
+    }
+    if (mDictBuffer->getTailPosition() >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS) {
+        AKLOGE("The dictionary is too large to dynamically update. Dictionary size: %d",
+                mDictBuffer->getTailPosition());
+        return false;
+    }
+    const int word0Pos = getTerminalPtNodePositionOfWord(word0, length0,
+            false /* forceLowerCaseSearch */);
+    if (word0Pos == NOT_A_DICT_POS) {
+        return false;
+    }
+    const int word1Pos = getTerminalPtNodePositionOfWord(word1, length1,
+            false /* forceLowerCaseSearch */);
+    if (word1Pos == NOT_A_DICT_POS) {
+        return false;
+    }
+    bool addedNewBigram = false;
+    if (mUpdatingHelper.addBigramWords(word0Pos, word1Pos, probability, timestamp,
+            &addedNewBigram)) {
+        if (addedNewBigram) {
+            mBigramCount++;
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+bool Ver4PatriciaTriePolicy::removeBigramWords(const int *const word0, const int length0,
+        const int *const word1, const int length1) {
+    if (!mBuffers.get()->isUpdatable()) {
+        AKLOGI("Warning: addBigramWords() is called for non-updatable dictionary.");
+        return false;
+    }
+    if (mDictBuffer->getTailPosition() >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS) {
+        AKLOGE("The dictionary is too large to dynamically update. Dictionary size: %d",
+                mDictBuffer->getTailPosition());
+        return false;
+    }
+    const int word0Pos = getTerminalPtNodePositionOfWord(word0, length0,
+            false /* forceLowerCaseSearch */);
+    if (word0Pos == NOT_A_DICT_POS) {
+        return false;
+    }
+    const int word1Pos = getTerminalPtNodePositionOfWord(word1, length1,
+            false /* forceLowerCaseSearch */);
+    if (word1Pos == NOT_A_DICT_POS) {
+        return false;
+    }
+    if (mUpdatingHelper.removeBigramWords(word0Pos, word1Pos)) {
+        mBigramCount--;
+        return true;
+    } else {
+        return false;
+    }
+}
+
+void Ver4PatriciaTriePolicy::flush(const char *const filePath) {
+    if (!mBuffers.get()->isUpdatable()) {
+        AKLOGI("Warning: flush() is called for non-updatable dictionary. filePath: %s", filePath);
+        return;
+    }
+    mWritingHelper.writeToDictFile(filePath, mUnigramCount, mBigramCount);
+}
+
+void Ver4PatriciaTriePolicy::flushWithGC(const char *const filePath) {
+    if (!mBuffers.get()->isUpdatable()) {
+        AKLOGI("Warning: flushWithGC() is called for non-updatable dictionary.");
+        return;
+    }
+    mWritingHelper.writeToDictFileWithGC(getRootPosition(), filePath);
+}
+
+bool Ver4PatriciaTriePolicy::needsToRunGC(const bool mindsBlockByGC) const {
+    if (!mBuffers.get()->isUpdatable()) {
+        AKLOGI("Warning: needsToRunGC() is called for non-updatable dictionary.");
+        return false;
+    }
+    if (mBuffers.get()->isNearSizeLimit()) {
+        // Additional buffer size is near the limit.
+        return true;
+    } else if (mHeaderPolicy->getExtendedRegionSize() + mDictBuffer->getUsedAdditionalBufferSize()
+            > Ver4DictConstants::MAX_DICT_EXTENDED_REGION_SIZE) {
+        // Total extended region size of the trie exceeds the limit.
+        return true;
+    } else if (mDictBuffer->getTailPosition() >= MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS
+            && mDictBuffer->getUsedAdditionalBufferSize() > 0) {
+        // Needs to reduce dictionary size.
+        return true;
+    } else if (mHeaderPolicy->isDecayingDict()) {
+        return ForgettingCurveUtils::needsToDecay(mindsBlockByGC, mUnigramCount, mBigramCount,
+                mHeaderPolicy);
+    }
+    return false;
+}
+
+void Ver4PatriciaTriePolicy::getProperty(const char *const query, const int queryLength,
+        char *const outResult, const int maxResultLength) {
+    const int compareLength = queryLength + 1 /* terminator */;
+    int timestamp = NOT_A_TIMESTAMP;
+    if (strncmp(query, UNIGRAM_COUNT_QUERY, compareLength) == 0) {
+        snprintf(outResult, maxResultLength, "%d", mUnigramCount);
+    } else if (strncmp(query, BIGRAM_COUNT_QUERY, compareLength) == 0) {
+        snprintf(outResult, maxResultLength, "%d", mBigramCount);
+    } else if (strncmp(query, MAX_UNIGRAM_COUNT_QUERY, compareLength) == 0) {
+        snprintf(outResult, maxResultLength, "%d",
+                mHeaderPolicy->isDecayingDict() ? ForgettingCurveUtils::MAX_UNIGRAM_COUNT :
+                        static_cast<int>(Ver4DictConstants::MAX_DICTIONARY_SIZE));
+    } else if (strncmp(query, MAX_BIGRAM_COUNT_QUERY, compareLength) == 0) {
+        snprintf(outResult, maxResultLength, "%d",
+                mHeaderPolicy->isDecayingDict() ? ForgettingCurveUtils::MAX_BIGRAM_COUNT :
+                        static_cast<int>(Ver4DictConstants::MAX_DICTIONARY_SIZE));
+    } else if (sscanf(query, SET_CURRENT_TIME_FOR_TESTING_QUERY_FORMAT, &timestamp) == 1) {
+        TimeKeeper::startTestModeWithForceCurrentTime(timestamp);
+    } else if (strncmp(query, GET_CURRENT_TIME_QUERY, compareLength) == 0) {
+        snprintf(outResult, maxResultLength, "%d", TimeKeeper::peekCurrentTime());
+    } else if (strncmp(query, QUIT_TIMEKEEPER_TEST_MODE_QUERY, compareLength) == 0) {
+        TimeKeeper::stopTestMode();
+    }
+}
+
+const UnigramProperty Ver4PatriciaTriePolicy::getUnigramProperty(const int *const codePoints,
+        const int codePointCount) const {
+    const int ptNodePos = getTerminalPtNodePositionOfWord(codePoints, codePointCount,
+            false /* forceLowerCaseSearch */);
+    if (ptNodePos == NOT_A_DICT_POS) {
+        AKLOGE("fetchUnigramProperty is called for invalid word.");
+        return UnigramProperty();
+    }
+    const PtNodeParams ptNodeParams = mNodeReader.fetchNodeInfoInBufferFromPtNodePos(ptNodePos);
+    const ProbabilityEntry probabilityEntry =
+            mBuffers.get()->getProbabilityDictContent()->getProbabilityEntry(
+                    ptNodeParams.getTerminalId());
+    const HistoricalInfo *const historicalInfo = probabilityEntry.getHistoricalInfo();
+    // Fetch shortcut information.
+    std::vector<std::vector<int> > shortcutTargets;
+    std::vector<int> shortcutProbabilities;
+    int shortcutPos = getShortcutPositionOfPtNode(ptNodePos);
+    if (shortcutPos != NOT_A_DICT_POS) {
+        int shortcutTarget[MAX_WORD_LENGTH];
+        const ShortcutDictContent *const shortcutDictContent =
+                mBuffers.get()->getShortcutDictContent();
+        bool hasNext = true;
+        while (hasNext) {
+            int shortcutTargetLength = 0;
+            int shortcutProbability = NOT_A_PROBABILITY;
+            shortcutDictContent->getShortcutEntryAndAdvancePosition(MAX_WORD_LENGTH, shortcutTarget,
+                    &shortcutTargetLength, &shortcutProbability, &hasNext, &shortcutPos);
+            std::vector<int> target(shortcutTarget, shortcutTarget + shortcutTargetLength);
+            shortcutTargets.push_back(target);
+            shortcutProbabilities.push_back(shortcutProbability);
+        }
+    }
+    return UnigramProperty(ptNodeParams.getCodePoints(), ptNodeParams.getCodePointCount(),
+            ptNodeParams.isNotAWord(), ptNodeParams.isBlacklisted(), ptNodeParams.hasBigrams(),
+            ptNodeParams.hasShortcutTargets(), ptNodeParams.getProbability(),
+            historicalInfo->getTimeStamp(), historicalInfo->getLevel(),
+            historicalInfo->getCount(), &shortcutTargets, &shortcutProbabilities);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
new file mode 100644
index 0000000..8187b7a
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_PATRICIA_TRIE_POLICY_H
+#define LATINIME_VER4_PATRICIA_TRIE_POLICY_H
+
+#include "defines.h"
+#include "suggest/core/policy/dictionary_structure_with_buffer_policy.h"
+#include "suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.h"
+#include "suggest/policyimpl/dictionary/header/header_policy.h"
+#include "suggest/policyimpl/dictionary/shortcut/ver4_shortcut_list_policy.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_updating_helper.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+class DicNode;
+class DicNodeVector;
+
+// TODO: Implement.
+class Ver4PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
+ public:
+    Ver4PatriciaTriePolicy(const Ver4DictBuffers::Ver4DictBuffersPtr &buffers)
+            : mBuffers(buffers), mHeaderPolicy(mBuffers.get()->getHeaderPolicy()),
+              mDictBuffer(mBuffers.get()->getWritableTrieBuffer()),
+              mBigramPolicy(mBuffers.get()->getMutableBigramDictContent(),
+                      mBuffers.get()->getTerminalPositionLookupTable(), mHeaderPolicy),
+              mShortcutPolicy(mBuffers.get()->getMutableShortcutDictContent(),
+                      mBuffers.get()->getTerminalPositionLookupTable()),
+              mNodeReader(mDictBuffer, mBuffers.get()->getProbabilityDictContent()),
+              mNodeWriter(mDictBuffer, mBuffers.get(), &mNodeReader, &mBigramPolicy,
+                      &mShortcutPolicy),
+              mUpdatingHelper(mDictBuffer, &mNodeReader, &mNodeWriter),
+              mWritingHelper(mBuffers.get()),
+              mUnigramCount(mHeaderPolicy->getUnigramCount()),
+              mBigramCount(mHeaderPolicy->getBigramCount()) {};
+
+    AK_FORCE_INLINE int getRootPosition() const {
+        return 0;
+    }
+
+    void createAndGetAllChildDicNodes(const DicNode *const dicNode,
+            DicNodeVector *const childDicNodes) const;
+
+    int getCodePointsAndProbabilityAndReturnCodePointCount(
+            const int terminalPtNodePos, const int maxCodePointCount, int *const outCodePoints,
+            int *const outUnigramProbability) const;
+
+    int getTerminalPtNodePositionOfWord(const int *const inWord,
+            const int length, const bool forceLowerCaseSearch) const;
+
+    int getProbability(const int unigramProbability, const int bigramProbability) const;
+
+    int getUnigramProbabilityOfPtNode(const int ptNodePos) const;
+
+    int getShortcutPositionOfPtNode(const int ptNodePos) const;
+
+    int getBigramsPositionOfPtNode(const int ptNodePos) const;
+
+    const DictionaryHeaderStructurePolicy *getHeaderStructurePolicy() const {
+        return mHeaderPolicy;
+    }
+
+    const DictionaryBigramsStructurePolicy *getBigramsStructurePolicy() const {
+        return &mBigramPolicy;
+    }
+
+    const DictionaryShortcutsStructurePolicy *getShortcutsStructurePolicy() const {
+        return &mShortcutPolicy;
+    }
+
+    bool addUnigramWord(const int *const word, const int length, const int probability,
+            const int *const shortcutTargetCodePoints, const int shortcutLength,
+            const int shortcutProbability, const bool isNotAWord, const bool isBlacklisted,
+            const int timestamp);
+
+    bool addBigramWords(const int *const word0, const int length0, const int *const word1,
+            const int length1, const int probability, const int timestamp);
+
+    bool removeBigramWords(const int *const word0, const int length0, const int *const word1,
+            const int length1);
+
+    void flush(const char *const filePath);
+
+    void flushWithGC(const char *const filePath);
+
+    bool needsToRunGC(const bool mindsBlockByGC) const;
+
+    void getProperty(const char *const query, const int queryLength, char *const outResult,
+            const int maxResultLength);
+
+    const UnigramProperty getUnigramProperty(const int *const codePoints,
+            const int codePointCount) const;
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(Ver4PatriciaTriePolicy);
+
+    static const char *const UNIGRAM_COUNT_QUERY;
+    static const char *const BIGRAM_COUNT_QUERY;
+    static const char *const MAX_UNIGRAM_COUNT_QUERY;
+    static const char *const MAX_BIGRAM_COUNT_QUERY;
+    static const char *const SET_CURRENT_TIME_FOR_TESTING_QUERY_FORMAT;
+    static const char *const GET_CURRENT_TIME_QUERY;
+    static const char *const QUIT_TIMEKEEPER_TEST_MODE_QUERY;
+    // When the dictionary size is near the maximum size, we have to refuse dynamic operations to
+    // prevent the dictionary from overflowing.
+    static const int MARGIN_TO_REFUSE_DYNAMIC_OPERATIONS;
+    static const int MIN_DICT_SIZE_TO_REFUSE_DYNAMIC_OPERATIONS;
+
+    Ver4DictBuffers::Ver4DictBuffersPtr mBuffers;
+    const HeaderPolicy *const mHeaderPolicy;
+    BufferWithExtendableBuffer *const mDictBuffer;
+    Ver4BigramListPolicy mBigramPolicy;
+    Ver4ShortcutListPolicy mShortcutPolicy;
+    Ver4PatriciaTrieNodeReader mNodeReader;
+    Ver4PatriciaTrieNodeWriter mNodeWriter;
+    DynamicPtUpdatingHelper mUpdatingHelper;
+    Ver4PatriciaTrieWritingHelper mWritingHelper;
+    int mUnigramCount;
+    int mBigramCount;
+};
+} // namespace latinime
+#endif // LATINIME_VER4_PATRICIA_TRIE_POLICY_H
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.cpp
new file mode 100644
index 0000000..254022d
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.cpp
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.h"
+
+#include "suggest/policyimpl/dictionary/utils/byte_array_utils.h"
+
+namespace latinime {
+
+/* static */ int Ver4PatriciaTrieReadingUtils::getTerminalIdAndAdvancePosition(
+        const uint8_t *const buffer, int *pos) {
+    return ByteArrayUtils::readUint32AndAdvancePosition(buffer, pos);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.h
new file mode 100644
index 0000000..e418c49
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_reading_utils.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_PATRICIA_TRIE_READING_UTILS_H
+#define LATINIME_VER4_PATRICIA_TRIE_READING_UTILS_H
+
+#include <stdint.h>
+
+#include "defines.h"
+
+namespace latinime {
+
+class BufferWithExtendableBuffer;
+
+class Ver4PatriciaTrieReadingUtils {
+ public:
+    static int getTerminalIdAndAdvancePosition(const uint8_t *const buffer,
+            int *const pos);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(Ver4PatriciaTrieReadingUtils);
+};
+} // namespace latinime
+#endif /* LATINIME_VER4_PATRICIA_TRIE_READING_UTILS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
new file mode 100644
index 0000000..4322763
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
@@ -0,0 +1,285 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.h"
+
+#include <cstring>
+#include <queue>
+
+#include "suggest/policyimpl/dictionary/bigram/ver4_bigram_list_policy.h"
+#include "suggest/policyimpl/dictionary/header/header_policy.h"
+#include "suggest/policyimpl/dictionary/shortcut/ver4_shortcut_list_policy.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_constants.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_reader.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/file_utils.h"
+#include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
+
+namespace latinime {
+
+void Ver4PatriciaTrieWritingHelper::writeToDictFile(const char *const dictDirPath,
+        const int unigramCount, const int bigramCount) const {
+    const HeaderPolicy *const headerPolicy = mBuffers->getHeaderPolicy();
+    BufferWithExtendableBuffer headerBuffer(
+            BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE);
+    const int extendedRegionSize = headerPolicy->getExtendedRegionSize()
+            + mBuffers->getTrieBuffer()->getUsedAdditionalBufferSize();
+    if (!headerPolicy->writeHeaderToBuffer(&headerBuffer, false /* updatesLastUpdatedTime */,
+            false /* updatesLastDecayedTime */, unigramCount, bigramCount, extendedRegionSize)) {
+        AKLOGE("Cannot write header structure to buffer. updatesLastUpdatedTime: %d, "
+                "updatesLastDecayedTime: %d, unigramCount: %d, bigramCount: %d, "
+                "extendedRegionSize: %d", false, false, unigramCount, bigramCount,
+                extendedRegionSize);
+        return;
+    }
+    mBuffers->flushHeaderAndDictBuffers(dictDirPath, &headerBuffer);
+}
+
+void Ver4PatriciaTrieWritingHelper::writeToDictFileWithGC(const int rootPtNodeArrayPos,
+        const char *const dictDirPath) {
+    const HeaderPolicy *const headerPolicy = mBuffers->getHeaderPolicy();
+    Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers(
+            Ver4DictBuffers::createVer4DictBuffers(headerPolicy));
+    int unigramCount = 0;
+    int bigramCount = 0;
+    if (!runGC(rootPtNodeArrayPos, headerPolicy, dictBuffers.get(), &unigramCount, &bigramCount)) {
+        return;
+    }
+    BufferWithExtendableBuffer headerBuffer(
+            BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE);
+    if (!headerPolicy->writeHeaderToBuffer(&headerBuffer, true /* updatesLastUpdatedTime */,
+            true /* updatesLastDecayedTime */, unigramCount, bigramCount,
+            0 /* extendedRegionSize */)) {
+        return;
+    }
+    dictBuffers.get()->flushHeaderAndDictBuffers(dictDirPath, &headerBuffer);
+}
+
+bool Ver4PatriciaTrieWritingHelper::runGC(const int rootPtNodeArrayPos,
+        const HeaderPolicy *const headerPolicy, Ver4DictBuffers *const buffersToWrite,
+        int *const outUnigramCount, int *const outBigramCount) {
+    Ver4PatriciaTrieNodeReader ptNodeReader(mBuffers->getTrieBuffer(),
+            mBuffers->getProbabilityDictContent());
+    Ver4BigramListPolicy bigramPolicy(mBuffers->getMutableBigramDictContent(),
+            mBuffers->getTerminalPositionLookupTable(), headerPolicy);
+    Ver4ShortcutListPolicy shortcutPolicy(mBuffers->getMutableShortcutDictContent(),
+            mBuffers->getTerminalPositionLookupTable());
+    Ver4PatriciaTrieNodeWriter ptNodeWriter(mBuffers->getWritableTrieBuffer(),
+            mBuffers, &ptNodeReader, &bigramPolicy, &shortcutPolicy);
+
+    DynamicPtReadingHelper readingHelper(mBuffers->getTrieBuffer(), &ptNodeReader);
+    readingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
+    DynamicPtGcEventListeners
+            ::TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
+                    traversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted(
+                            &ptNodeWriter);
+    if (!readingHelper.traverseAllPtNodesInPostorderDepthFirstManner(
+            &traversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted)) {
+        return false;
+    }
+    const int unigramCount = traversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
+            .getValidUnigramCount();
+    if (headerPolicy->isDecayingDict()
+            && unigramCount > ForgettingCurveUtils::MAX_UNIGRAM_COUNT_AFTER_GC) {
+        if (!truncateUnigrams(&ptNodeReader, &ptNodeWriter,
+                ForgettingCurveUtils::MAX_UNIGRAM_COUNT_AFTER_GC)) {
+            AKLOGE("Cannot remove unigrams. current: %d, max: %d", unigramCount,
+                    ForgettingCurveUtils::MAX_UNIGRAM_COUNT_AFTER_GC);
+            return false;
+        }
+    }
+
+    readingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
+    DynamicPtGcEventListeners::TraversePolicyToUpdateBigramProbability
+            traversePolicyToUpdateBigramProbability(&ptNodeWriter);
+    if (!readingHelper.traverseAllPtNodesInPostorderDepthFirstManner(
+            &traversePolicyToUpdateBigramProbability)) {
+        return false;
+    }
+    const int bigramCount = traversePolicyToUpdateBigramProbability.getValidBigramEntryCount();
+    if (headerPolicy->isDecayingDict()
+            && bigramCount > ForgettingCurveUtils::MAX_BIGRAM_COUNT_AFTER_GC) {
+        if (!truncateBigrams(ForgettingCurveUtils::MAX_BIGRAM_COUNT_AFTER_GC)) {
+            AKLOGE("Cannot remove bigrams. current: %d, max: %d", bigramCount,
+                    ForgettingCurveUtils::MAX_BIGRAM_COUNT_AFTER_GC);
+            return false;
+        }
+    }
+
+    // Mapping from positions in mBuffer to positions in bufferToWrite.
+    PtNodeWriter::DictPositionRelocationMap dictPositionRelocationMap;
+    readingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
+    Ver4PatriciaTrieNodeWriter ptNodeWriterForNewBuffers(buffersToWrite->getWritableTrieBuffer(),
+            buffersToWrite, &ptNodeReader, &bigramPolicy, &shortcutPolicy);
+    DynamicPtGcEventListeners::TraversePolicyToPlaceAndWriteValidPtNodesToBuffer
+            traversePolicyToPlaceAndWriteValidPtNodesToBuffer(&ptNodeWriterForNewBuffers,
+                    buffersToWrite->getWritableTrieBuffer(), &dictPositionRelocationMap);
+    if (!readingHelper.traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
+            &traversePolicyToPlaceAndWriteValidPtNodesToBuffer)) {
+        return false;
+    }
+
+    // Create policy instances for the GCed dictionary.
+    Ver4PatriciaTrieNodeReader newPtNodeReader(buffersToWrite->getTrieBuffer(),
+            buffersToWrite->getProbabilityDictContent());
+    Ver4BigramListPolicy newBigramPolicy(buffersToWrite->getMutableBigramDictContent(),
+            buffersToWrite->getTerminalPositionLookupTable(), headerPolicy);
+    Ver4ShortcutListPolicy newShortcutPolicy(buffersToWrite->getMutableShortcutDictContent(),
+            buffersToWrite->getTerminalPositionLookupTable());
+    Ver4PatriciaTrieNodeWriter newPtNodeWriter(buffersToWrite->getWritableTrieBuffer(),
+            buffersToWrite, &newPtNodeReader, &newBigramPolicy, &newShortcutPolicy);
+    // Re-assign terminal IDs for valid terminal PtNodes.
+    TerminalPositionLookupTable::TerminalIdMap terminalIdMap;
+    if(!buffersToWrite->getMutableTerminalPositionLookupTable()->runGCTerminalIds(
+            &terminalIdMap)) {
+        return false;
+    }
+    // Run GC for probability dict content.
+    if (!buffersToWrite->getMutableProbabilityDictContent()->runGC(&terminalIdMap,
+            mBuffers->getProbabilityDictContent())) {
+        return false;
+    }
+    // Run GC for bigram dict content.
+    if(!buffersToWrite->getMutableBigramDictContent()->runGC(&terminalIdMap,
+            mBuffers->getBigramDictContent(), outBigramCount)) {
+        return false;
+    }
+    // Run GC for shortcut dict content.
+    if(!buffersToWrite->getMutableShortcutDictContent()->runGC(&terminalIdMap,
+            mBuffers->getShortcutDictContent())) {
+        return false;
+    }
+    DynamicPtReadingHelper newDictReadingHelper(buffersToWrite->getTrieBuffer(),
+            &newPtNodeReader);
+    newDictReadingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
+    DynamicPtGcEventListeners::TraversePolicyToUpdateAllPositionFields
+            traversePolicyToUpdateAllPositionFields(&newPtNodeWriter, &dictPositionRelocationMap);
+    if (!newDictReadingHelper.traverseAllPtNodesInPtNodeArrayLevelPreorderDepthFirstManner(
+            &traversePolicyToUpdateAllPositionFields)) {
+        return false;
+    }
+    newDictReadingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
+    TraversePolicyToUpdateAllPtNodeFlagsAndTerminalIds
+            traversePolicyToUpdateAllPtNodeFlagsAndTerminalIds(&newPtNodeWriter, &terminalIdMap);
+    if (!newDictReadingHelper.traverseAllPtNodesInPostorderDepthFirstManner(
+            &traversePolicyToUpdateAllPtNodeFlagsAndTerminalIds)) {
+        return false;
+    }
+    *outUnigramCount = traversePolicyToUpdateAllPositionFields.getUnigramCount();
+    return true;
+}
+
+bool Ver4PatriciaTrieWritingHelper::truncateUnigrams(
+        const Ver4PatriciaTrieNodeReader *const ptNodeReader,
+        Ver4PatriciaTrieNodeWriter *const ptNodeWriter, const int maxUnigramCount) {
+    const TerminalPositionLookupTable *const terminalPosLookupTable =
+            mBuffers->getTerminalPositionLookupTable();
+    const int nextTerminalId = terminalPosLookupTable->getNextTerminalId();
+    std::priority_queue<DictProbability, std::vector<DictProbability>, DictProbabilityComparator>
+            priorityQueue;
+    for (int i = 0; i < nextTerminalId; ++i) {
+        const int terminalPos = terminalPosLookupTable->getTerminalPtNodePosition(i);
+        if (terminalPos == NOT_A_DICT_POS) {
+            continue;
+        }
+        const ProbabilityEntry probabilityEntry =
+                mBuffers->getProbabilityDictContent()->getProbabilityEntry(i);
+        const int probability = probabilityEntry.hasHistoricalInfo() ?
+                ForgettingCurveUtils::decodeProbability(probabilityEntry.getHistoricalInfo()) :
+                        probabilityEntry.getProbability();
+        priorityQueue.push(DictProbability(terminalPos, probability,
+                probabilityEntry.getHistoricalInfo()->getTimeStamp()));
+    }
+
+    // Delete unigrams.
+    while (static_cast<int>(priorityQueue.size()) > maxUnigramCount) {
+        const int ptNodePos = priorityQueue.top().getDictPos();
+        const PtNodeParams ptNodeParams =
+                ptNodeReader->fetchNodeInfoInBufferFromPtNodePos(ptNodePos);
+        if (!ptNodeWriter->markPtNodeAsWillBecomeNonTerminal(&ptNodeParams)) {
+            AKLOGE("Cannot mark PtNode as willBecomeNonterminal. PtNode pos: %d", ptNodePos);
+            return false;
+        }
+        priorityQueue.pop();
+    }
+    return true;
+}
+
+bool Ver4PatriciaTrieWritingHelper::truncateBigrams(const int maxBigramCount) {
+    const TerminalPositionLookupTable *const terminalPosLookupTable =
+            mBuffers->getTerminalPositionLookupTable();
+    const int nextTerminalId = terminalPosLookupTable->getNextTerminalId();
+    std::priority_queue<DictProbability, std::vector<DictProbability>, DictProbabilityComparator>
+            priorityQueue;
+    BigramDictContent *const bigramDictContent = mBuffers->getMutableBigramDictContent();
+    for (int i = 0; i < nextTerminalId; ++i) {
+        const int bigramListPos = bigramDictContent->getBigramListHeadPos(i);
+        if (bigramListPos == NOT_A_DICT_POS) {
+            continue;
+        }
+        bool hasNext = true;
+        int readingPos = bigramListPos;
+        while (hasNext) {
+            const int entryPos = readingPos;
+            const BigramEntry bigramEntry =
+                    bigramDictContent->getBigramEntryAndAdvancePosition(&readingPos);
+            hasNext = bigramEntry.hasNext();
+            if (!bigramEntry.isValid()) {
+                continue;
+            }
+            const int probability = bigramEntry.hasHistoricalInfo() ?
+                    ForgettingCurveUtils::decodeProbability(bigramEntry.getHistoricalInfo()) :
+                            bigramEntry.getProbability();
+            priorityQueue.push(DictProbability(entryPos, probability,
+                    bigramEntry.getHistoricalInfo()->getTimeStamp()));
+        }
+    }
+
+    // Delete bigrams.
+    while (static_cast<int>(priorityQueue.size()) > maxBigramCount) {
+        const int entryPos = priorityQueue.top().getDictPos();
+        const BigramEntry bigramEntry = bigramDictContent->getBigramEntry(entryPos);
+        const BigramEntry invalidatedBigramEntry = bigramEntry.getInvalidatedEntry();
+        if (!bigramDictContent->writeBigramEntry(&invalidatedBigramEntry, entryPos)) {
+            AKLOGE("Cannot write bigram entry to remove. pos: %d", entryPos);
+            return false;
+        }
+        priorityQueue.pop();
+    }
+    return true;
+}
+
+bool Ver4PatriciaTrieWritingHelper::TraversePolicyToUpdateAllPtNodeFlagsAndTerminalIds
+        ::onVisitingPtNode(const PtNodeParams *const ptNodeParams) {
+    if (!ptNodeParams->isTerminal()) {
+        return true;
+    }
+    TerminalPositionLookupTable::TerminalIdMap::const_iterator it =
+            mTerminalIdMap->find(ptNodeParams->getTerminalId());
+    if (it == mTerminalIdMap->end()) {
+        AKLOGE("terminal Id %d is not in the terminal position map. map size: %zd",
+                ptNodeParams->getTerminalId(), mTerminalIdMap->size());
+        return false;
+    }
+    if (!mPtNodeWriter->updateTerminalId(ptNodeParams, it->second)) {
+        AKLOGE("Cannot update terminal id. %d -> %d", it->first, it->second);
+    }
+    return mPtNodeWriter->updatePtNodeHasBigramsAndShortcutTargetsFlags(ptNodeParams);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.h
new file mode 100644
index 0000000..c3a155e
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.h
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_VER4_PATRICIA_TRIE_WRITING_HELPER_H
+#define LATINIME_VER4_PATRICIA_TRIE_WRITING_HELPER_H
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_gc_event_listeners.h"
+#include "suggest/policyimpl/dictionary/structure/v4/content/terminal_position_lookup_table.h"
+
+namespace latinime {
+
+class HeaderPolicy;
+class Ver4DictBuffers;
+class Ver4PatriciaTrieNodeReader;
+class Ver4PatriciaTrieNodeWriter;
+
+class Ver4PatriciaTrieWritingHelper {
+ public:
+    Ver4PatriciaTrieWritingHelper(Ver4DictBuffers *const buffers)
+            : mBuffers(buffers) {}
+
+    void writeToDictFile(const char *const dictDirPath, const int unigramCount,
+            const int bigramCount) const;
+
+    void writeToDictFileWithGC(const int rootPtNodeArrayPos, const char *const dictDirPath);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(Ver4PatriciaTrieWritingHelper);
+
+    class TraversePolicyToUpdateAllPtNodeFlagsAndTerminalIds
+            : public DynamicPtReadingHelper::TraversingEventListener {
+     public:
+        TraversePolicyToUpdateAllPtNodeFlagsAndTerminalIds(
+                Ver4PatriciaTrieNodeWriter *const ptNodeWriter,
+                const TerminalPositionLookupTable::TerminalIdMap *const terminalIdMap)
+                : mPtNodeWriter(ptNodeWriter), mTerminalIdMap(terminalIdMap) {}
+
+        bool onAscend() { return true; }
+
+        bool onDescend(const int ptNodeArrayPos) { return true; }
+
+        bool onReadingPtNodeArrayTail() { return true; }
+
+        bool onVisitingPtNode(const PtNodeParams *const ptNodeParams);
+
+     private:
+        DISALLOW_IMPLICIT_CONSTRUCTORS(TraversePolicyToUpdateAllPtNodeFlagsAndTerminalIds);
+
+        Ver4PatriciaTrieNodeWriter *const mPtNodeWriter;
+        const TerminalPositionLookupTable::TerminalIdMap *const mTerminalIdMap;
+    };
+
+    // For truncateUnigrams() and truncateBigrams().
+    class DictProbability {
+     public:
+        DictProbability(const int dictPos, const int probability, const int timestamp)
+                : mDictPos(dictPos), mProbability(probability), mTimestamp(timestamp) {}
+
+        int getDictPos() const {
+            return mDictPos;
+        }
+
+        int getProbability() const {
+            return mProbability;
+        }
+
+        int getTimestamp() const {
+            return mTimestamp;
+        }
+
+     private:
+        DISALLOW_DEFAULT_CONSTRUCTOR(DictProbability);
+
+        int mDictPos;
+        int mProbability;
+        int mTimestamp;
+    };
+
+    // For truncateUnigrams() and truncateBigrams().
+    class DictProbabilityComparator {
+     public:
+        bool operator()(const DictProbability &left, const DictProbability &right) {
+            if (left.getProbability() != right.getProbability()) {
+                return left.getProbability() > right.getProbability();
+            }
+            if (left.getTimestamp() != right.getTimestamp()) {
+                return left.getTimestamp() < right.getTimestamp();
+            }
+            return left.getDictPos() > right.getDictPos();
+        }
+
+     private:
+        DISALLOW_ASSIGNMENT_OPERATOR(DictProbabilityComparator);
+    };
+
+    bool runGC(const int rootPtNodeArrayPos, const HeaderPolicy *const headerPolicy,
+            Ver4DictBuffers *const buffersToWrite, int *const outUnigramCount,
+            int *const outBigramCount);
+
+    bool truncateUnigrams(const Ver4PatriciaTrieNodeReader *const ptNodeReader,
+            Ver4PatriciaTrieNodeWriter *const ptNodeWriter, const int maxUnigramCount);
+
+    bool truncateBigrams(const int maxBigramCount);
+
+    Ver4DictBuffers *const mBuffers;
+};
+} // namespace latinime
+
+#endif /* LATINIME_VER4_PATRICIA_TRIE_WRITING_HELPER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.cpp
index f692882..259dae4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.cpp
@@ -18,11 +18,42 @@
 
 namespace latinime {
 
-const size_t BufferWithExtendableBuffer::MAX_ADDITIONAL_BUFFER_SIZE = 1024 * 1024;
+const size_t BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE = 1024 * 1024;
 const int BufferWithExtendableBuffer::NEAR_BUFFER_LIMIT_THRESHOLD_PERCENTILE = 90;
 // TODO: Needs to allocate larger memory corresponding to the current vector size.
 const size_t BufferWithExtendableBuffer::EXTEND_ADDITIONAL_BUFFER_SIZE_STEP = 128 * 1024;
 
+uint32_t BufferWithExtendableBuffer::readUint(const int size, const int pos) const {
+    const bool readingPosIsInAdditionalBuffer = isInAdditionalBuffer(pos);
+    const int posInBuffer = readingPosIsInAdditionalBuffer ? pos - mOriginalBufferSize : pos;
+    return ByteArrayUtils::readUint(getBuffer(readingPosIsInAdditionalBuffer), size, posInBuffer);
+}
+
+uint32_t BufferWithExtendableBuffer::readUintAndAdvancePosition(const int size,
+        int *const pos) const {
+    const int value = readUint(size, *pos);
+    *pos += size;
+    return value;
+}
+
+void BufferWithExtendableBuffer::readCodePointsAndAdvancePosition(const int maxCodePointCount,
+        int *const outCodePoints, int *outCodePointCount, int *const pos) const {
+    const bool readingPosIsInAdditionalBuffer = isInAdditionalBuffer(*pos);
+    if (readingPosIsInAdditionalBuffer) {
+        *pos -= mOriginalBufferSize;
+    }
+    *outCodePointCount = ByteArrayUtils::readStringAndAdvancePosition(
+            getBuffer(readingPosIsInAdditionalBuffer), maxCodePointCount, outCodePoints, pos);
+    if (readingPosIsInAdditionalBuffer) {
+        *pos += mOriginalBufferSize;
+    }
+}
+
+bool BufferWithExtendableBuffer::writeUint(const uint32_t data, const int size, const int pos) {
+    int writingPos = pos;
+    return writeUintAndAdvancePosition(data, size, &writingPos);
+}
+
 bool BufferWithExtendableBuffer::writeUintAndAdvancePosition(const uint32_t data, const int size,
         int *const pos) {
     if (!(size >= 1 && size <= 4)) {
@@ -46,7 +77,7 @@
 }
 
 bool BufferWithExtendableBuffer::writeCodePointsAndAdvancePosition(const int *const codePoints,
-        const int codePointCount, const bool writesTerminator ,int *const pos) {
+        const int codePointCount, const bool writesTerminator, int *const pos) {
     const size_t size = ByteArrayUtils::calculateRequiredByteCountToStoreCodePoints(
             codePoints, codePointCount, writesTerminator);
     if (!checkAndPrepareWriting(*pos, size)) {
@@ -100,4 +131,21 @@
     return true;
 }
 
+bool BufferWithExtendableBuffer::copy(const BufferWithExtendableBuffer *const sourceBuffer) {
+    int copyingPos = 0;
+    const int tailPos = sourceBuffer->getTailPosition();
+    const int maxDataChunkSize = sizeof(uint32_t);
+    while (copyingPos < tailPos) {
+        const int remainingSize = tailPos - copyingPos;
+        const int copyingSize = (remainingSize >= maxDataChunkSize) ?
+                maxDataChunkSize : remainingSize;
+        const uint32_t data = sourceBuffer->readUint(copyingSize, copyingPos);
+        if (!writeUint(data, copyingSize, copyingPos)) {
+            return false;
+        }
+        copyingPos += copyingSize;
+    }
+    return true;
+}
+
 }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h b/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h
index 9dc3482..76be165 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h
@@ -32,12 +32,20 @@
 // raw pointer but provides several methods that handle boundary checking for writing data.
 class BufferWithExtendableBuffer {
  public:
+    static const size_t DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE;
+
     BufferWithExtendableBuffer(uint8_t *const originalBuffer, const int originalBufferSize,
-            const int maxAdditionalBufferSize = MAX_ADDITIONAL_BUFFER_SIZE)
+            const int maxAdditionalBufferSize)
             : mOriginalBuffer(originalBuffer), mOriginalBufferSize(originalBufferSize),
               mAdditionalBuffer(EXTEND_ADDITIONAL_BUFFER_SIZE_STEP), mUsedAdditionalBufferSize(0),
               mMaxAdditionalBufferSize(maxAdditionalBufferSize) {}
 
+    // Without original buffer.
+    BufferWithExtendableBuffer(const int maxAdditionalBufferSize)
+            : mOriginalBuffer(0), mOriginalBufferSize(0),
+              mAdditionalBuffer(EXTEND_ADDITIONAL_BUFFER_SIZE_STEP), mUsedAdditionalBufferSize(0),
+              mMaxAdditionalBufferSize(maxAdditionalBufferSize) {}
+
     AK_FORCE_INLINE int getTailPosition() const {
         return mOriginalBufferSize + mUsedAdditionalBufferSize;
     }
@@ -63,6 +71,13 @@
         }
     }
 
+    uint32_t readUint(const int size, const int pos) const;
+
+    uint32_t readUintAndAdvancePosition(const int size, int *const pos) const;
+
+    void readCodePointsAndAdvancePosition(const int maxCodePointCount,
+            int *const outCodePoints, int *outCodePointCount, int *const pos) const;
+
     AK_FORCE_INLINE int getOriginalBufferSize() const {
         return mOriginalBufferSize;
     }
@@ -78,15 +93,18 @@
      * Writing is allowed for original buffer, already written region of additional buffer and the
      * tail of additional buffer.
      */
+    bool writeUint(const uint32_t data, const int size, const int pos);
+
     bool writeUintAndAdvancePosition(const uint32_t data, const int size, int *const pos);
 
     bool writeCodePointsAndAdvancePosition(const int *const codePoints, const int codePointCount,
             const bool writesTerminator, int *const pos);
 
+    bool copy(const BufferWithExtendableBuffer *const sourceBuffer);
+
  private:
     DISALLOW_COPY_AND_ASSIGN(BufferWithExtendableBuffer);
 
-    static const size_t MAX_ADDITIONAL_BUFFER_SIZE;
     static const int NEAR_BUFFER_LIMIT_THRESHOLD_PERCENTILE;
     static const size_t EXTEND_ADDITIONAL_BUFFER_SIZE_STEP;
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/byte_array_utils.h b/native/jni/src/suggest/policyimpl/dictionary/utils/byte_array_utils.h
index 0c15768..ebdd523 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/byte_array_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/byte_array_utils.h
@@ -114,6 +114,24 @@
         return buffer[(*pos)++];
     }
 
+    static AK_FORCE_INLINE int readUint(const uint8_t *const buffer,
+            const int size, const int pos) {
+        // size must be in 1 to 4.
+        ASSERT(size >= 1 && size <= 4);
+        switch (size) {
+            case 1:
+                return ByteArrayUtils::readUint8(buffer, pos);
+            case 2:
+                return ByteArrayUtils::readUint16(buffer, pos);
+            case 3:
+                return ByteArrayUtils::readUint24(buffer, pos);
+            case 4:
+                return ByteArrayUtils::readUint32(buffer, pos);
+            default:
+                return 0;
+        }
+    }
+
     /**
      * Code Point Reading
      *
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp
index 994826f..442373b 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp
@@ -17,12 +17,14 @@
 #include "suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h"
 
 #include <cstdio>
-#include <cstring>
 
 #include "suggest/policyimpl/dictionary/header/header_policy.h"
-#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h"
+#include "suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_writing_utils.h"
+#include "suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h"
 #include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/file_utils.h"
 #include "suggest/policyimpl/dictionary/utils/format_utils.h"
+#include "utils/time_keeper.h"
 
 namespace latinime {
 
@@ -30,60 +32,81 @@
 
 /* static */ bool DictFileWritingUtils::createEmptyDictFile(const char *const filePath,
         const int dictVersion, const HeaderReadWriteUtils::AttributeMap *const attributeMap) {
+    TimeKeeper::setCurrentTime();
     switch (dictVersion) {
-        case 3:
-            return createEmptyV3DictFile(filePath, attributeMap);
+        case FormatUtils::VERSION_4:
+            return createEmptyV4DictFile(filePath, attributeMap);
         default:
-            // Only version 3 dictionary is supported for now.
+            AKLOGE("Cannot create dictionary %s because format version %d is not supported.",
+                    filePath, dictVersion);
             return false;
     }
 }
 
-/* static */ bool DictFileWritingUtils::createEmptyV3DictFile(const char *const filePath,
+/* static */ bool DictFileWritingUtils::createEmptyV4DictFile(const char *const dirPath,
         const HeaderReadWriteUtils::AttributeMap *const attributeMap) {
-    BufferWithExtendableBuffer headerBuffer(0 /* originalBuffer */, 0 /* originalBufferSize */);
-    HeaderPolicy headerPolicy(FormatUtils::VERSION_3, attributeMap);
-    headerPolicy.writeHeaderToBuffer(&headerBuffer, true /* updatesLastUpdatedTime */,
-            true /* updatesLastDecayedTime */, 0 /* unigramCount */, 0 /* bigramCount */,
-            0 /* extendedRegionSize */);
-    BufferWithExtendableBuffer bodyBuffer(0 /* originalBuffer */, 0 /* originalBufferSize */);
-    if (!DynamicPatriciaTrieWritingUtils::writeEmptyDictionary(&bodyBuffer, 0 /* rootPos */)) {
+    HeaderPolicy headerPolicy(FormatUtils::VERSION_4, attributeMap);
+    Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers =
+            Ver4DictBuffers::createVer4DictBuffers(&headerPolicy);
+    headerPolicy.writeHeaderToBuffer(dictBuffers.get()->getWritableHeaderBuffer(),
+            true /* updatesLastUpdatedTime */, true /* updatesLastDecayedTime */,
+            0 /* unigramCount */, 0 /* bigramCount */, 0 /* extendedRegionSize */);
+    if (!DynamicPtWritingUtils::writeEmptyDictionary(
+            dictBuffers.get()->getWritableTrieBuffer(), 0 /* rootPos */)) {
+        AKLOGE("Empty ver4 dictionary structure cannot be created on memory.");
         return false;
     }
-    return flushAllHeaderAndBodyToFile(filePath, &headerBuffer, &bodyBuffer);
+    return dictBuffers.get()->flush(dirPath);
 }
 
 /* static */ bool DictFileWritingUtils::flushAllHeaderAndBodyToFile(const char *const filePath,
         BufferWithExtendableBuffer *const dictHeader, BufferWithExtendableBuffer *const dictBody) {
-    const int tmpFileNameBufSize = strlen(filePath)
-            + strlen(TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE) + 1 /* terminator */;
+    const int tmpFileNameBufSize = FileUtils::getFilePathWithSuffixBufSize(filePath,
+            TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE);
     // Name of a temporary file used for writing that is a connected string of original name and
     // TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE.
     char tmpFileName[tmpFileNameBufSize];
-    snprintf(tmpFileName, tmpFileNameBufSize, "%s%s", filePath,
-            TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE);
-    FILE *const file = fopen(tmpFileName, "wb");
+    FileUtils::getFilePathWithSuffix(filePath, TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE,
+            tmpFileNameBufSize, tmpFileName);
+    if (!DictFileWritingUtils::flushBufferToFile(tmpFileName, dictHeader)) {
+        AKLOGE("Dictionary header cannot be written to %s.", tmpFileName);
+        return false;
+    }
+    if (!DictFileWritingUtils::flushBufferToFile(tmpFileName, dictBody)) {
+        AKLOGE("Dictionary structure cannot be written to %s.", tmpFileName);
+        return false;
+    }
+    if (rename(tmpFileName, filePath) != 0) {
+        AKLOGE("Dictionary file %s cannot be renamed to %s", tmpFileName, filePath);;
+        return false;
+    }
+    return true;
+}
+
+/* static */ bool DictFileWritingUtils::flushBufferToFileWithSuffix(const char *const basePath,
+        const char *const suffix, const BufferWithExtendableBuffer *const buffer) {
+    const int filePathBufSize = FileUtils::getFilePathWithSuffixBufSize(basePath, suffix);
+    char filePath[filePathBufSize];
+    FileUtils::getFilePathWithSuffix(basePath, suffix, filePathBufSize, filePath);
+    return flushBufferToFile(filePath, buffer);
+}
+
+/* static */ bool DictFileWritingUtils::flushBufferToFile(const char *const filePath,
+        const BufferWithExtendableBuffer *const buffer) {
+    FILE *const file = fopen(filePath, "wb");
     if (!file) {
-        AKLOGE("Dictionary file %s cannnot be opened.", tmpFileName);
+        AKLOGE("File %s cannot be opened.", filePath);
         ASSERT(false);
         return false;
     }
-    // Write the dictionary header.
-    if (!writeBufferToFile(file, dictHeader)) {
-        remove(tmpFileName);
-        AKLOGE("Dictionary header cannnot be written. size: %d", dictHeader->getTailPosition());
-        ASSERT(false);
-        return false;
-    }
-    // Write the dictionary body.
-    if (!writeBufferToFile(file, dictBody)) {
-        remove(tmpFileName);
-        AKLOGE("Dictionary body cannnot be written. size: %d", dictBody->getTailPosition());
+    if (!writeBufferToFile(file, buffer)) {
+        remove(filePath);
+        AKLOGE("Buffer cannot be written to the file %s. size: %d", filePath,
+                buffer->getTailPosition());
         ASSERT(false);
         return false;
     }
     fclose(file);
-    rename(tmpFileName, filePath);
     return true;
 }
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h b/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h
index bd4ac66..bdf9fd6 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.h
@@ -28,6 +28,8 @@
 
 class DictFileWritingUtils {
  public:
+    static const char *const TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE;
+
     static bool createEmptyDictFile(const char *const filePath, const int dictVersion,
             const HeaderReadWriteUtils::AttributeMap *const attributeMap);
 
@@ -35,14 +37,18 @@
             BufferWithExtendableBuffer *const dictHeader,
             BufferWithExtendableBuffer *const dictBody);
 
+    static bool flushBufferToFileWithSuffix(const char *const basePath, const char *const suffix,
+            const BufferWithExtendableBuffer *const buffer);
+
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(DictFileWritingUtils);
 
-    static const char *const TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE;
-
-    static bool createEmptyV3DictFile(const char *const filePath,
+    static bool createEmptyV4DictFile(const char *const filePath,
             const HeaderReadWriteUtils::AttributeMap *const attributeMap);
 
+    static bool flushBufferToFile(const char *const filePath,
+            const BufferWithExtendableBuffer *const buffer);
+
     static bool writeBufferToFile(FILE *const file,
             const BufferWithExtendableBuffer *const buffer);
 };
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp
new file mode 100644
index 0000000..9441a75
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.cpp
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/utils/file_utils.h"
+
+#include <cstdio>
+#include <cstring>
+#include <dirent.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+namespace latinime {
+
+// Returns -1 on error.
+/* static */ int FileUtils::getFileSize(const char *const filePath) {
+    const int fd = open(filePath, O_RDONLY);
+    if (fd == -1) {
+        return -1;
+    }
+    struct stat statBuf;
+    if (fstat(fd, &statBuf) != 0) {
+        close(fd);
+        return -1;
+    }
+    close(fd);
+    return static_cast<int>(statBuf.st_size);
+}
+
+/* static */ bool FileUtils::existsDir(const char *const dirPath) {
+    DIR *const dir = opendir(dirPath);
+    if (dir == NULL) {
+        return false;
+    }
+    closedir(dir);
+    return true;
+}
+
+// Remove a directory and all files in the directory.
+/* static */ bool FileUtils::removeDirAndFiles(const char *const dirPath) {
+    return removeDirAndFiles(dirPath, 5 /* maxTries */);
+}
+
+// Remove a directory and all files in the directory, trying up to maxTimes.
+/* static */ bool FileUtils::removeDirAndFiles(const char *const dirPath, const int maxTries) {
+    DIR *const dir = opendir(dirPath);
+    if (dir == NULL) {
+        AKLOGE("Cannot open dir %s.", dirPath);
+        return true;
+    }
+    struct dirent *dirent;
+    while ((dirent = readdir(dir)) != NULL) {
+        if (dirent->d_type == DT_DIR) {
+            continue;
+        }
+        const int filePathBufSize = getFilePathBufSize(dirPath, dirent->d_name);
+        char filePath[filePathBufSize];
+        getFilePath(dirPath, dirent->d_name, filePathBufSize, filePath);
+        if (remove(filePath) != 0) {
+            AKLOGE("Cannot remove file %s.", filePath);
+            closedir(dir);
+            return false;
+        }
+    }
+    closedir(dir);
+    if (remove(dirPath) != 0) {
+        if (maxTries > 0) {
+            // On NFS, deleting files sometimes creates new files. I'm not sure what the
+            // correct way of dealing with this is, but for the time being, this seems to work.
+            removeDirAndFiles(dirPath, maxTries - 1);
+        } else {
+            AKLOGE("Cannot remove directory %s.", dirPath);
+            return false;
+        }
+    }
+    return true;
+}
+
+/* static */ int FileUtils::getFilePathWithSuffixBufSize(const char *const filePath,
+        const char *const suffix) {
+    return strlen(filePath) + strlen(suffix) + 1 /* terminator */;
+}
+
+/* static */ void FileUtils::getFilePathWithSuffix(const char *const filePath,
+        const char *const suffix, const int filePathBufSize, char *const outFilePath) {
+    snprintf(outFilePath, filePathBufSize, "%s%s", filePath, suffix);
+}
+
+/* static */ int FileUtils::getFilePathBufSize(const char *const dirPath,
+        const char *const fileName) {
+    return strlen(dirPath) + 1 /* '/' */ + strlen(fileName) + 1 /* terminator */;
+}
+
+/* static */ void FileUtils::getFilePath(const char *const dirPath, const char *const fileName,
+        const int filePathBufSize, char *const outFilePath) {
+    snprintf(outFilePath, filePathBufSize, "%s/%s", dirPath, fileName);
+}
+
+/* static */ bool FileUtils::getFilePathWithoutSuffix(const char *const filePath,
+        const char *const suffix, const int outDirPathBufSize, char *const outDirPath) {
+    const int filePathLength = strlen(filePath);
+    const int suffixLength = strlen(suffix);
+    if (filePathLength <= suffixLength) {
+        AKLOGE("File path length (%s:%d) is shorter that suffix length (%s:%d).",
+                filePath, filePathLength, suffix, suffixLength);
+        return false;
+    }
+    const int resultFilePathLength = filePathLength - suffixLength;
+    if (outDirPathBufSize <= resultFilePathLength) {
+        AKLOGE("outDirPathBufSize is too small. filePath: %s, suffix: %s, outDirPathBufSize: %d",
+                filePath, suffix, outDirPathBufSize);
+        return false;
+    }
+    if (strncmp(filePath + resultFilePathLength, suffix, suffixLength) != 0) {
+        AKLOGE("File Path %s does not have %s as a suffix", filePath, suffix);
+        return false;
+    }
+    snprintf(outDirPath, resultFilePathLength + 1 /* terminator */, "%s", filePath);
+    return true;
+}
+
+/* static */ void FileUtils::getDirPath(const char *const filePath, const int outDirPathBufSize,
+        char *const outDirPath) {
+    for (int i = strlen(filePath) - 1; i >= 0; --i) {
+        if (filePath[i] == '/') {
+            if (i >= outDirPathBufSize) {
+                AKLOGE("outDirPathBufSize is too small. filePath: %s, outDirPathBufSize: %d",
+                        filePath, outDirPathBufSize);
+                ASSERT(false);
+                return;
+            }
+            snprintf(outDirPath, i + 1 /* terminator */, "%s", filePath);
+            return;
+        }
+    }
+}
+
+/* static */ void FileUtils::getBasename(const char *const filePath,
+        const int outNameBufSize, char *const outName) {
+    const int filePathBufSize = strlen(filePath) + 1 /* terminator */;
+    char filePathBuf[filePathBufSize];
+    snprintf(filePathBuf, filePathBufSize, "%s", filePath);
+    const char *const baseName = basename(filePathBuf);
+    const int baseNameLength = strlen(baseName);
+    if (baseNameLength >= outNameBufSize) {
+        AKLOGE("outNameBufSize is too small. filePath: %s, outNameBufSize: %d",
+                filePath, outNameBufSize);
+        return;
+    }
+    snprintf(outName, baseNameLength + 1 /* terminator */, "%s", baseName);
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.h b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.h
new file mode 100644
index 0000000..4f1b93a
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/file_utils.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_FILE_UTILS_H
+#define LATINIME_FILE_UTILS_H
+
+#include "defines.h"
+
+namespace latinime {
+
+class FileUtils {
+ public:
+    // Returns -1 on error.
+    static int getFileSize(const char *const filePath);
+
+    static bool existsDir(const char *const dirPath);
+
+    // Remove a directory and all files in the directory.
+    static bool removeDirAndFiles(const char *const dirPath);
+
+    static int getFilePathWithSuffixBufSize(const char *const filePath, const char *const suffix);
+
+    static void getFilePathWithSuffix(const char *const filePath, const char *const suffix,
+            const int filePathBufSize, char *const outFilePath);
+
+    static int getFilePathBufSize(const char *const dirPath, const char *const fileName);
+
+    static void getFilePath(const char *const dirPath, const char *const fileName,
+            const int filePathBufSize, char *const outFilePath);
+
+    // Returns whether the filePath have the suffix.
+    static bool getFilePathWithoutSuffix(const char *const filePath, const char *const suffix,
+            const int dirPathBufSize, char *const outDirPath);
+
+    static void getDirPath(const char *const filePath, const int dirPathBufSize,
+            char *const outDirPath);
+
+    static void getBasename(const char *const filePath, const int outNameBufSize,
+            char *const outName);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(FileUtils);
+
+    static bool removeDirAndFiles(const char *const dirPath, const int maxTries);
+};
+} // namespace latinime
+#endif /* LATINIME_FILE_UTILS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.cpp
index 1632fd0..4050ad3 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.cpp
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-#include <cmath>
-#include <ctime>
-#include <stdlib.h>
-
 #include "suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h"
 
+#include <cmath>
+#include <stdlib.h>
+
 #include "suggest/core/policy/dictionary_header_structure_policy.h"
 #include "suggest/policyimpl/dictionary/utils/probability_utils.h"
+#include "utils/time_keeper.h"
 
 namespace latinime {
 
@@ -31,76 +31,86 @@
 const int ForgettingCurveUtils::MAX_BIGRAM_COUNT_AFTER_GC = 10000;
 
 const int ForgettingCurveUtils::MAX_COMPUTED_PROBABILITY = 127;
-const int ForgettingCurveUtils::MAX_ENCODED_PROBABILITY = 15;
-const int ForgettingCurveUtils::MIN_VALID_ENCODED_PROBABILITY = 3;
-const int ForgettingCurveUtils::ENCODED_PROBABILITY_STEP = 1;
-// Currently, we try to decay each uni/bigram once every 2 hours. Accordingly, the expected
-// duration of the decay is approximately 66hours.
-const float ForgettingCurveUtils::MIN_PROBABILITY_TO_DECAY = 0.03f;
 const int ForgettingCurveUtils::DECAY_INTERVAL_SECONDS = 2 * 60 * 60;
 
-const ForgettingCurveUtils::ProbabilityTable ForgettingCurveUtils::sProbabilityTable;
-ForgettingCurveUtils::TimeKeeper ForgettingCurveUtils::sTimeKeeper;
+const int ForgettingCurveUtils::MAX_LEVEL = 3;
+const int ForgettingCurveUtils::MAX_COUNT = 3;
+const int ForgettingCurveUtils::MIN_VALID_LEVEL = 1;
+const int ForgettingCurveUtils::TIME_STEP_DURATION_IN_SECONDS = 6 * 60 * 60;
+const int ForgettingCurveUtils::MAX_ELAPSED_TIME_STEP_COUNT = 15;
+const int ForgettingCurveUtils::DISCARD_LEVEL_ZERO_ENTRY_TIME_STEP_COUNT_THRESHOLD = 14;
 
-void ForgettingCurveUtils::TimeKeeper::setCurrentTime() {
-    mCurrentTime = time(0);
+const ForgettingCurveUtils::ProbabilityTable ForgettingCurveUtils::sProbabilityTable;
+
+/* static */ const HistoricalInfo ForgettingCurveUtils::createUpdatedHistoricalInfo(
+        const HistoricalInfo *const originalHistoricalInfo,
+        const int newProbability, const int timestamp) {
+    if (newProbability != NOT_A_PROBABILITY && originalHistoricalInfo->getLevel() == 0) {
+        return HistoricalInfo(timestamp, MIN_VALID_LEVEL /* level */, 0 /* count */);
+    } else if (!originalHistoricalInfo->isValid()) {
+        // Initial information.
+        return HistoricalInfo(timestamp, 0 /* level */, 1 /* count */);
+    } else {
+        const int updatedCount = originalHistoricalInfo->getCount() + 1;
+        if (updatedCount > MAX_COUNT) {
+            // The count exceeds the max value the level can be incremented.
+            if (originalHistoricalInfo->getLevel() >= MAX_LEVEL) {
+                // The level is already max.
+                return HistoricalInfo(timestamp, originalHistoricalInfo->getLevel(),
+                        originalHistoricalInfo->getCount());
+            } else {
+                // Level up.
+                return HistoricalInfo(timestamp, originalHistoricalInfo->getLevel() + 1,
+                        0 /* count */);
+            }
+        } else {
+            return HistoricalInfo(timestamp, originalHistoricalInfo->getLevel(), updatedCount);
+        }
+    }
 }
 
-/* static */ int ForgettingCurveUtils::getProbability(const int encodedUnigramProbability,
-        const int encodedBigramProbability) {
-    if (encodedUnigramProbability == NOT_A_PROBABILITY) {
+/* static */ int ForgettingCurveUtils::decodeProbability(
+        const HistoricalInfo *const historicalInfo) {
+    const int elapsedTimeStepCount = getElapsedTimeStepCount(historicalInfo->getTimeStamp());
+    return sProbabilityTable.getProbability(historicalInfo->getLevel(),
+            min(max(elapsedTimeStepCount, 0), MAX_ELAPSED_TIME_STEP_COUNT));
+}
+
+/* static */ int ForgettingCurveUtils::getProbability(const int unigramProbability,
+        const int bigramProbability) {
+    if (unigramProbability == NOT_A_PROBABILITY) {
         return NOT_A_PROBABILITY;
-    } else if (encodedBigramProbability == NOT_A_PROBABILITY) {
-        return backoff(decodeProbability(encodedUnigramProbability));
+    } else if (bigramProbability == NOT_A_PROBABILITY) {
+        return min(backoff(unigramProbability), MAX_COMPUTED_PROBABILITY);
     } else {
-        const int unigramProbability = decodeProbability(encodedUnigramProbability);
-        const int bigramProbability = decodeProbability(encodedBigramProbability);
         return min(max(unigramProbability, bigramProbability), MAX_COMPUTED_PROBABILITY);
     }
 }
 
-// Caveat: Unlike getProbability(), this method doesn't assume special bigram probability encoding
-// (i.e. unigram probability + bigram probability delta).
-/* static */ int ForgettingCurveUtils::getUpdatedEncodedProbability(
-        const int originalEncodedProbability, const int newProbability) {
-    if (originalEncodedProbability == NOT_A_PROBABILITY) {
-        // The bigram relation is not in this dictionary.
-        if (newProbability == NOT_A_PROBABILITY) {
-            // The bigram target is not in other dictionaries.
-            return 0;
-        } else {
-            return MIN_VALID_ENCODED_PROBABILITY;
-        }
-    } else {
-        if (newProbability != NOT_A_PROBABILITY
-                && originalEncodedProbability < MIN_VALID_ENCODED_PROBABILITY) {
-            return MIN_VALID_ENCODED_PROBABILITY;
-        }
-        return min(originalEncodedProbability + ENCODED_PROBABILITY_STEP, MAX_ENCODED_PROBABILITY);
-    }
+/* static */ bool ForgettingCurveUtils::needsToKeep(const HistoricalInfo *const historicalInfo) {
+    return historicalInfo->getLevel() > 0
+            || getElapsedTimeStepCount(historicalInfo->getTimeStamp())
+                    < DISCARD_LEVEL_ZERO_ENTRY_TIME_STEP_COUNT_THRESHOLD;
 }
 
-/* static */ int ForgettingCurveUtils::isValidEncodedProbability(const int encodedProbability) {
-    return encodedProbability >= MIN_VALID_ENCODED_PROBABILITY;
-}
-
-/* static */ int ForgettingCurveUtils::getEncodedProbabilityToSave(const int encodedProbability,
-        const DictionaryHeaderStructurePolicy *const headerPolicy) {
-    const int elapsedTime = sTimeKeeper.peekCurrentTime() - headerPolicy->getLastDecayedTime();
-    const int decayIterationCount = max(elapsedTime / DECAY_INTERVAL_SECONDS, 1);
-    int currentEncodedProbability = max(min(encodedProbability, MAX_ENCODED_PROBABILITY), 0);
-    // TODO: Implement the decay in more proper way.
-    for (int i = 0; i < decayIterationCount; ++i) {
-        const float currentRate = static_cast<float>(currentEncodedProbability)
-                / static_cast<float>(MAX_ENCODED_PROBABILITY);
-        const float thresholdToDecay = (1.0f - MIN_PROBABILITY_TO_DECAY) * currentRate;
-        const float randValue = static_cast<float>(rand()) / static_cast<float>(RAND_MAX);
-        if (thresholdToDecay < randValue) {
-            currentEncodedProbability = max(currentEncodedProbability - ENCODED_PROBABILITY_STEP,
-                    0);
-        }
+/* static */ const HistoricalInfo ForgettingCurveUtils::createHistoricalInfoToSave(
+        const HistoricalInfo *const originalHistoricalInfo) {
+    if (originalHistoricalInfo->getTimeStamp() == NOT_A_TIMESTAMP) {
+        return HistoricalInfo();
     }
-    return currentEncodedProbability;
+    const int elapsedTimeStep = getElapsedTimeStepCount(originalHistoricalInfo->getTimeStamp());
+    if (elapsedTimeStep <= MAX_ELAPSED_TIME_STEP_COUNT) {
+        // No need to update historical info.
+        return *originalHistoricalInfo;
+    }
+    // Level down.
+    const int maxLevelDownAmonut = elapsedTimeStep / (MAX_ELAPSED_TIME_STEP_COUNT + 1);
+    const int levelDownAmount = (maxLevelDownAmonut >= originalHistoricalInfo->getLevel()) ?
+            originalHistoricalInfo->getLevel() : maxLevelDownAmonut;
+    const int adjustedTimestamp = originalHistoricalInfo->getTimeStamp() +
+            levelDownAmount * (MAX_ELAPSED_TIME_STEP_COUNT + 1) * TIME_STEP_DURATION_IN_SECONDS;
+    return HistoricalInfo(adjustedTimestamp,
+            originalHistoricalInfo->getLevel() - levelDownAmount, 0 /* count */);
 }
 
 /* static */ bool ForgettingCurveUtils::needsToDecay(const bool mindsBlockByDecay,
@@ -116,21 +126,14 @@
     if (mindsBlockByDecay) {
         return false;
     }
-    if (headerPolicy->getLastDecayedTime() + DECAY_INTERVAL_SECONDS < time(0)) {
+    if (headerPolicy->getLastDecayedTime() + DECAY_INTERVAL_SECONDS
+            < TimeKeeper::peekCurrentTime()) {
         // Time to decay.
         return true;
     }
     return false;
 }
 
-/* static */ int ForgettingCurveUtils::decodeProbability(const int encodedProbability) {
-    if (encodedProbability < MIN_VALID_ENCODED_PROBABILITY) {
-        return NOT_A_PROBABILITY;
-    } else {
-        return min(sProbabilityTable.getProbability(encodedProbability), MAX_ENCODED_PROBABILITY);
-    }
-}
-
 // See comments in ProbabilityUtils::backoff().
 /* static */ int ForgettingCurveUtils::backoff(const int unigramProbability) {
     if (unigramProbability == NOT_A_PROBABILITY) {
@@ -140,15 +143,29 @@
     }
 }
 
+/* static */ int ForgettingCurveUtils::getElapsedTimeStepCount(const int timestamp) {
+    return (TimeKeeper::peekCurrentTime() - timestamp) / TIME_STEP_DURATION_IN_SECONDS;
+}
+
 ForgettingCurveUtils::ProbabilityTable::ProbabilityTable() : mTable() {
-    // Table entry is as follows:
-    // 1, 1, 1, 2, 3, 5, 6, 9, 13, 18, 25, 34, 48, 66, 91, 127.
-    // Note that first MIN_VALID_ENCODED_PROBABILITY values are not used.
-    mTable.resize(MAX_ENCODED_PROBABILITY + 1);
-    for (int i = 0; i <= MAX_ENCODED_PROBABILITY; ++i) {
-        const int probability = static_cast<int>(powf(static_cast<float>(MAX_COMPUTED_PROBABILITY),
-                static_cast<float>(i) / static_cast<float>(MAX_ENCODED_PROBABILITY)));
-         mTable[i] = min(MAX_COMPUTED_PROBABILITY, max(0, probability));
+    mTable.resize(MAX_LEVEL + 1);
+    for (int level = 0; level <= MAX_LEVEL; ++level) {
+        mTable[level].resize(MAX_ELAPSED_TIME_STEP_COUNT + 1);
+        const float initialProbability =
+                static_cast<float>(MAX_COMPUTED_PROBABILITY / (1 << (MAX_LEVEL - level)));
+        for (int timeStepCount = 0; timeStepCount <= MAX_ELAPSED_TIME_STEP_COUNT; ++timeStepCount) {
+            if (level == 0) {
+                mTable[level][timeStepCount] = NOT_A_PROBABILITY;
+                continue;
+            }
+            const int elapsedTime = timeStepCount * TIME_STEP_DURATION_IN_SECONDS;
+            const float probability = initialProbability
+                    * powf(2.0f, -1.0f * static_cast<float>(elapsedTime)
+                            / static_cast<float>(TIME_STEP_DURATION_IN_SECONDS
+                                    * (MAX_ELAPSED_TIME_STEP_COUNT + 1)));
+            mTable[level][timeStepCount] =
+                    min(max(static_cast<int>(probability), 1), MAX_COMPUTED_PROBABILITY);
+        }
     }
 }
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h b/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h
index 2ad4238..6ac8dc5 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h
@@ -20,45 +20,33 @@
 #include <vector>
 
 #include "defines.h"
+#include "suggest/policyimpl/dictionary/utils/historical_info.h"
 
 namespace latinime {
 
 class DictionaryHeaderStructurePolicy;
 
-// TODO: Check the elapsed time and decrease the probability depending on the time. Time field is
-// required to introduced to each terminal PtNode and bigram entry.
 // TODO: Quit using bigram probability to indicate the delta.
 class ForgettingCurveUtils {
  public:
-    class TimeKeeper {
-     public:
-        TimeKeeper() : mCurrentTime(0) {}
-        void setCurrentTime();
-        int peekCurrentTime() const { return mCurrentTime; };
-
-     private:
-        DISALLOW_COPY_AND_ASSIGN(TimeKeeper);
-
-        int mCurrentTime;
-    };
-
     static const int MAX_UNIGRAM_COUNT;
     static const int MAX_UNIGRAM_COUNT_AFTER_GC;
     static const int MAX_BIGRAM_COUNT;
     static const int MAX_BIGRAM_COUNT_AFTER_GC;
 
-    static TimeKeeper sTimeKeeper;
+    static const HistoricalInfo createUpdatedHistoricalInfo(
+            const HistoricalInfo *const originalHistoricalInfo, const int newProbability,
+            const int timestamp);
+
+    static const HistoricalInfo createHistoricalInfoToSave(
+            const HistoricalInfo *const originalHistoricalInfo);
+
+    static int decodeProbability(const HistoricalInfo *const historicalInfo);
 
     static int getProbability(const int encodedUnigramProbability,
             const int encodedBigramProbability);
 
-    static int getUpdatedEncodedProbability(const int originalEncodedProbability,
-            const int newProbability);
-
-    static int isValidEncodedProbability(const int encodedProbability);
-
-    static int getEncodedProbabilityToSave(const int encodedProbability,
-            const DictionaryHeaderStructurePolicy *const headerPolicy);
+    static bool needsToKeep(const HistoricalInfo *const historicalInfo);
 
     static bool needsToDecay(const bool mindsBlockByDecay, const int unigramCount,
             const int bigramCount, const DictionaryHeaderStructurePolicy *const headerPolicy);
@@ -70,31 +58,32 @@
      public:
         ProbabilityTable();
 
-        int getProbability(const int encodedProbability) const {
-            if (encodedProbability < 0 || encodedProbability > static_cast<int>(mTable.size())) {
-                return NOT_A_PROBABILITY;
-            }
-            return mTable[encodedProbability];
+        int getProbability(const int level, const int elapsedTimeStepCount) const {
+            return mTable[level][elapsedTimeStepCount];
         }
 
      private:
         DISALLOW_COPY_AND_ASSIGN(ProbabilityTable);
 
-        std::vector<int> mTable;
+        std::vector<std::vector<int> > mTable;
     };
 
     static const int MAX_COMPUTED_PROBABILITY;
-    static const int MAX_ENCODED_PROBABILITY;
-    static const int MIN_VALID_ENCODED_PROBABILITY;
-    static const int ENCODED_PROBABILITY_STEP;
-    static const float MIN_PROBABILITY_TO_DECAY;
     static const int DECAY_INTERVAL_SECONDS;
 
+    static const int MAX_LEVEL;
+    static const int MAX_COUNT;
+    static const int MIN_VALID_LEVEL;
+    static const int TIME_STEP_DURATION_IN_SECONDS;
+    static const int MAX_ELAPSED_TIME_STEP_COUNT;
+    static const int DISCARD_LEVEL_ZERO_ENTRY_TIME_STEP_COUNT_THRESHOLD;
+    static const int HALF_LIFE_TIME_IN_SECONDS;
+
     static const ProbabilityTable sProbabilityTable;
 
-    static int decodeProbability(const int encodedProbability);
-
     static int backoff(const int unigramProbability);
+
+    static int getElapsedTimeStepCount(const int timestamp);
 };
 } // namespace latinime
 #endif /* LATINIME_FORGETTING_CURVE_UTILS_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.cpp
index 1d77d5c..cd3c403 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.cpp
@@ -41,10 +41,13 @@
             // Dictionary format version number (2 bytes)
             // Options (2 bytes)
             // Header size (4 bytes) : integer, big endian
-            if (ByteArrayUtils::readUint16(dict, 4) == 2) {
+            // Conceptually this converts the hardcoded value of the bytes in the file into
+            // the symbolic value we use in the code. But we want the constants to be the
+            // same so we use them for both here.
+            if (ByteArrayUtils::readUint16(dict, 4) == VERSION_2) {
                 return VERSION_2;
-            } else if (ByteArrayUtils::readUint16(dict, 4) == 3) {
-                return VERSION_3;
+            } else if (ByteArrayUtils::readUint16(dict, 4) == VERSION_4) {
+                return VERSION_4;
             } else {
                 return UNKNOWN_VERSION;
             }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.h b/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.h
index 79ed0de..7c6a21d 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/format_utils.h
@@ -29,9 +29,10 @@
 class FormatUtils {
  public:
     enum FORMAT_VERSION {
-        VERSION_2,
-        VERSION_3,
-        UNKNOWN_VERSION
+        // These MUST have the same values as the relevant constants in FormatSpec.java.
+        VERSION_2 = 2,
+        VERSION_4 = 401,
+        UNKNOWN_VERSION = -1
     };
 
     // 32 bit magic number is stored at the beginning of the dictionary header to reject
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/historical_info.h b/native/jni/src/suggest/policyimpl/dictionary/utils/historical_info.h
new file mode 100644
index 0000000..428ca86
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/historical_info.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_HISTORICAL_INFO_H
+#define LATINIME_HISTORICAL_INFO_H
+
+#include "defines.h"
+
+namespace latinime {
+
+class HistoricalInfo {
+ public:
+    // Invalid historical info.
+    HistoricalInfo()
+            : mTimestamp(NOT_A_TIMESTAMP), mLevel(0), mCount(0) {}
+
+    HistoricalInfo(const int timestamp, const int level, const int count)
+            : mTimestamp(timestamp), mLevel(level), mCount(count) {}
+
+    bool isValid() const {
+        return mTimestamp != NOT_A_TIMESTAMP;
+    }
+
+    int getTimeStamp() const {
+        return mTimestamp;
+    }
+
+    int getLevel() const {
+        return mLevel;
+    }
+
+    int getCount() const {
+        return mCount;
+    }
+
+ private:
+    // Copy constructor is public to use this class as a type of return value.
+    DISALLOW_ASSIGNMENT_OPERATOR(HistoricalInfo);
+
+    const int mTimestamp;
+    const int mLevel;
+    const int mCount;
+};
+} // namespace latinime
+#endif /* LATINIME_HISTORICAL_INFO_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.cpp
new file mode 100644
index 0000000..e88d6e0
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
+
+#include <cerrno>
+#include <climits>
+#include <cstdio>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "suggest/policyimpl/dictionary/utils/file_utils.h"
+
+namespace latinime {
+
+/* static */ MmappedBuffer::MmappedBufferPtr MmappedBuffer::openBuffer(
+        const char *const path, const int bufferOffset, const int bufferSize,
+        const bool isUpdatable) {
+    const int mmapFd = open(path, O_RDONLY);
+    if (mmapFd < 0) {
+        AKLOGE("DICT: Can't open the source. path=%s errno=%d", path, errno);
+        return MmappedBufferPtr(0);
+    }
+    const int pagesize = sysconf(_SC_PAGESIZE);
+    const int offset = bufferOffset % pagesize;
+    int alignedOffset = bufferOffset - offset;
+    int alignedSize = bufferSize + offset;
+    const int protMode = isUpdatable ? PROT_READ | PROT_WRITE : PROT_READ;
+    void *const mmappedBuffer = mmap(0, alignedSize, protMode, MAP_PRIVATE, mmapFd,
+            alignedOffset);
+    if (mmappedBuffer == MAP_FAILED) {
+        AKLOGE("DICT: Can't mmap dictionary. errno=%d", errno);
+        close(mmapFd);
+        return MmappedBufferPtr(0);
+    }
+    uint8_t *const buffer = static_cast<uint8_t *>(mmappedBuffer) + offset;
+    if (!buffer) {
+        AKLOGE("DICT: buffer is null");
+        close(mmapFd);
+        return MmappedBufferPtr(0);
+    }
+    return MmappedBufferPtr(new MmappedBuffer(buffer, bufferSize, mmappedBuffer, alignedSize,
+            mmapFd, isUpdatable));
+}
+
+/* static */ MmappedBuffer::MmappedBufferPtr MmappedBuffer::openBuffer(
+        const char *const path, const bool isUpdatable) {
+    const int fileSize = FileUtils::getFileSize(path);
+    if (fileSize == -1) {
+        return MmappedBufferPtr(0);
+    } else if (fileSize == 0) {
+        return MmappedBufferPtr(new MmappedBuffer(isUpdatable));
+    } else {
+        return openBuffer(path, 0 /* bufferOffset */, fileSize, isUpdatable);
+    }
+}
+
+/* static */ MmappedBuffer::MmappedBufferPtr MmappedBuffer::openBuffer(
+        const char *const dirPath, const char *const fileName, const bool isUpdatable) {
+    const int filePathBufferSize = PATH_MAX + 1 /* terminator */;
+    char filePath[filePathBufferSize];
+    const int filePathLength = snprintf(filePath, filePathBufferSize, "%s%s", dirPath,
+            fileName);
+    if (filePathLength >= filePathBufferSize) {
+        return 0;
+    }
+    return openBuffer(filePath, isUpdatable);
+}
+
+MmappedBuffer::~MmappedBuffer() {
+    if (mAlignedSize == 0) {
+        return;
+    }
+    int ret = munmap(mMmappedBuffer, mAlignedSize);
+    if (ret != 0) {
+        AKLOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno);
+    }
+    ret = close(mMmapFd);
+    if (ret != 0) {
+        AKLOGE("DICT: Failure in close. ret=%d errno=%d", ret, errno);
+    }
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
index 6b69116..73a733b 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
@@ -17,58 +17,27 @@
 #ifndef LATINIME_MMAPPED_BUFFER_H
 #define LATINIME_MMAPPED_BUFFER_H
 
-#include <cerrno>
-#include <fcntl.h>
 #include <stdint.h>
-#include <sys/mman.h>
-#include <unistd.h>
 
 #include "defines.h"
+#include "utils/exclusive_ownership_pointer.h"
 
 namespace latinime {
 
 class MmappedBuffer {
  public:
-    static MmappedBuffer* openBuffer(const char *const path, const int bufferOffset,
-            const int bufferSize, const bool isUpdatable) {
-        const int openMode = isUpdatable ? O_RDWR : O_RDONLY;
-        const int mmapFd = open(path, openMode);
-        if (mmapFd < 0) {
-            AKLOGE("DICT: Can't open the source. path=%s errno=%d", path, errno);
-            return 0;
-        }
-        const int pagesize = getpagesize();
-        const int offset = bufferOffset % pagesize;
-        int alignedOffset = bufferOffset - offset;
-        int alignedSize = bufferSize + offset;
-        const int protMode = isUpdatable ? PROT_READ | PROT_WRITE : PROT_READ;
-        void *const mmappedBuffer = mmap(0, alignedSize, protMode, MAP_PRIVATE, mmapFd,
-                alignedOffset);
-        if (mmappedBuffer == MAP_FAILED) {
-            AKLOGE("DICT: Can't mmap dictionary. errno=%d", errno);
-            close(mmapFd);
-            return 0;
-        }
-        uint8_t *const buffer = static_cast<uint8_t *>(mmappedBuffer) + offset;
-        if (!buffer) {
-            AKLOGE("DICT: buffer is null");
-            close(mmapFd);
-            return 0;
-        }
-        return new MmappedBuffer(buffer, bufferSize, mmappedBuffer, alignedSize, mmapFd,
-                isUpdatable);
-    }
+    typedef ExclusiveOwnershipPointer<MmappedBuffer> MmappedBufferPtr;
 
-    ~MmappedBuffer() {
-        int ret = munmap(mMmappedBuffer, mAlignedSize);
-        if (ret != 0) {
-            AKLOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno);
-        }
-        ret = close(mMmapFd);
-        if (ret != 0) {
-            AKLOGE("DICT: Failure in close. ret=%d errno=%d", ret, errno);
-        }
-    }
+    static MmappedBufferPtr openBuffer(const char *const path,
+            const int bufferOffset, const int bufferSize, const bool isUpdatable);
+
+    // Mmap entire file.
+    static MmappedBufferPtr openBuffer(const char *const path, const bool isUpdatable);
+
+    static MmappedBufferPtr openBuffer(const char *const dirPath, const char *const fileName,
+            const bool isUpdatable);
+
+    ~MmappedBuffer();
 
     AK_FORCE_INLINE uint8_t *getBuffer() const {
         return mBuffer;
@@ -89,6 +58,11 @@
             : mBuffer(buffer), mBufferSize(bufferSize), mMmappedBuffer(mmappedBuffer),
               mAlignedSize(alignedSize), mMmapFd(mmapFd), mIsUpdatable(isUpdatable) {}
 
+    // Empty file. We have to handle an empty file as a valid part of a dictionary.
+    AK_FORCE_INLINE MmappedBuffer(const bool isUpdatable)
+            : mBuffer(0), mBufferSize(0), mMmappedBuffer(0), mAlignedSize(0), mMmapFd(0),
+              mIsUpdatable(isUpdatable) {}
+
     DISALLOW_IMPLICIT_CONSTRUCTORS(MmappedBuffer);
 
     uint8_t *const mBuffer;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/sparse_table.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/sparse_table.cpp
new file mode 100644
index 0000000..c380429
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/sparse_table.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "suggest/policyimpl/dictionary/utils/sparse_table.h"
+
+namespace latinime {
+
+const int SparseTable::NOT_EXIST = -1;
+const int SparseTable::INDEX_SIZE = 4;
+
+bool SparseTable::contains(const int id) const {
+    const int readingPos = getPosInIndexTable(id);
+    if (id < 0 || mIndexTableBuffer->getTailPosition() <= readingPos) {
+        return false;
+    }
+    const int index = mIndexTableBuffer->readUint(INDEX_SIZE, readingPos);
+    return index != NOT_EXIST;
+}
+
+uint32_t SparseTable::get(const int id) const {
+    const int indexTableReadingPos = getPosInIndexTable(id);
+    const int index = mIndexTableBuffer->readUint(INDEX_SIZE, indexTableReadingPos);
+    const int contentTableReadingPos = getPosInContentTable(id, index);
+    const int contentValue = mContentTableBuffer->readUint(mDataSize, contentTableReadingPos);
+    return contentValue == NOT_EXIST ? NOT_A_DICT_POS : contentValue;
+}
+
+bool SparseTable::set(const int id, const uint32_t value) {
+    const int posInIndexTable = getPosInIndexTable(id);
+    // Extends the index table if needed.
+    if (mIndexTableBuffer->getTailPosition() < posInIndexTable) {
+        int tailPos = mIndexTableBuffer->getTailPosition();
+        while(tailPos < posInIndexTable) {
+            if (!mIndexTableBuffer->writeUintAndAdvancePosition(NOT_EXIST, INDEX_SIZE, &tailPos)) {
+                AKLOGE("cannot extend index table. tailPos: %d to: %d", tailPos, posInIndexTable);
+                return false;
+            }
+        }
+    }
+    if (contains(id)) {
+        // The entry is already in the content table.
+        const int index = mIndexTableBuffer->readUint(INDEX_SIZE, posInIndexTable);
+        if (!mContentTableBuffer->writeUint(value, mDataSize, getPosInContentTable(id, index))) {
+            AKLOGE("cannot update value %d. pos: %d, tailPos: %d, mDataSize: %d", value,
+                    getPosInContentTable(id, index), mContentTableBuffer->getTailPosition(),
+                    mDataSize);
+            return false;
+        }
+        return true;
+    }
+    // The entry is not in the content table.
+    // Create new entry in the content table.
+    const int index = getIndexFromContentTablePos(mContentTableBuffer->getTailPosition());
+    if (!mIndexTableBuffer->writeUint(index, INDEX_SIZE, posInIndexTable)) {
+        AKLOGE("cannot write index %d. pos %d", index, posInIndexTable);
+        return false;
+    }
+    // Write a new block that containing the entry to be set.
+    int writingPos = getPosInContentTable(0 /* id */, index);
+    for (int i = 0; i < mBlockSize; ++i) {
+        if (!mContentTableBuffer->writeUintAndAdvancePosition(NOT_EXIST, mDataSize,
+                &writingPos)) {
+            AKLOGE("cannot write content table to extend. writingPos: %d, tailPos: %d, "
+                    "mDataSize: %d", writingPos, mContentTableBuffer->getTailPosition(), mDataSize);
+            return false;
+        }
+    }
+    return mContentTableBuffer->writeUint(value, mDataSize, getPosInContentTable(id, index));
+}
+
+int SparseTable::getIndexFromContentTablePos(const int contentTablePos) const {
+    return contentTablePos / mDataSize / mBlockSize;
+}
+
+int SparseTable::getPosInIndexTable(const int id) const {
+    return (id / mBlockSize) * INDEX_SIZE;
+}
+
+int SparseTable::getPosInContentTable(const int id, const int index) const {
+    const int offset = id % mBlockSize;
+    return (index * mBlockSize + offset) * mDataSize;
+}
+
+} // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/sparse_table.h b/native/jni/src/suggest/policyimpl/dictionary/utils/sparse_table.h
new file mode 100644
index 0000000..21c1675
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/sparse_table.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_SPARSE_TABLE_H
+#define LATINIME_SPARSE_TABLE_H
+
+#include <stdint.h>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+// Note that there is a corresponding implementation in SparseTable.java.
+// TODO: Support multiple content buffers.
+class SparseTable {
+ public:
+    SparseTable(BufferWithExtendableBuffer *const indexTableBuffer,
+            BufferWithExtendableBuffer *const contentTableBuffer, const int blockSize,
+            const int dataSize)
+            : mIndexTableBuffer(indexTableBuffer), mContentTableBuffer(contentTableBuffer),
+              mBlockSize(blockSize), mDataSize(dataSize) {}
+
+    bool contains(const int id) const;
+
+    uint32_t get(const int id) const;
+
+    bool set(const int id, const uint32_t value);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(SparseTable);
+
+    int getIndexFromContentTablePos(const int contentTablePos) const;
+
+    int getPosInIndexTable(const int id) const;
+
+    int getPosInContentTable(const int id, const int index) const;
+
+    static const int NOT_EXIST;
+    static const int INDEX_SIZE;
+
+    BufferWithExtendableBuffer *const mIndexTableBuffer;
+    BufferWithExtendableBuffer *const mContentTableBuffer;
+    const int mBlockSize;
+    const int mDataSize;
+};
+} // namespace latinime
+#endif /* LATINIME_SPARSE_TABLE_H */
diff --git a/native/jni/src/suggest/policyimpl/typing/scoring_params.cpp b/native/jni/src/suggest/policyimpl/typing/scoring_params.cpp
index 104eb2a..7b33206 100644
--- a/native/jni/src/suggest/policyimpl/typing/scoring_params.cpp
+++ b/native/jni/src/suggest/policyimpl/typing/scoring_params.cpp
@@ -22,6 +22,12 @@
 const int ScoringParams::THRESHOLD_NEXT_WORD_PROBABILITY = 40;
 const int ScoringParams::THRESHOLD_NEXT_WORD_PROBABILITY_FOR_CAPPED = 120;
 const float ScoringParams::AUTOCORRECT_OUTPUT_THRESHOLD = 1.0f;
+
+const float ScoringParams::EXACT_MATCH_PROMOTION = 1.1f;
+const float ScoringParams::CASE_ERROR_PENALTY_FOR_EXACT_MATCH = 0.01f;
+const float ScoringParams::ACCENT_ERROR_PENALTY_FOR_EXACT_MATCH = 0.02f;
+const float ScoringParams::DIGRAPH_PENALTY_FOR_EXACT_MATCH = 0.03f;
+
 // TODO: Unlimit max cache dic node size
 const int ScoringParams::MAX_CACHE_DIC_NODE_SIZE = 170;
 const int ScoringParams::MAX_CACHE_DIC_NODE_SIZE_FOR_SINGLE_POINT = 310;
diff --git a/native/jni/src/suggest/policyimpl/typing/scoring_params.h b/native/jni/src/suggest/policyimpl/typing/scoring_params.h
index 7d4b5c3..de7410d 100644
--- a/native/jni/src/suggest/policyimpl/typing/scoring_params.h
+++ b/native/jni/src/suggest/policyimpl/typing/scoring_params.h
@@ -32,6 +32,11 @@
     static const int MAX_CACHE_DIC_NODE_SIZE_FOR_SINGLE_POINT;
     static const int THRESHOLD_SHORT_WORD_LENGTH;
 
+    static const float EXACT_MATCH_PROMOTION;
+    static const float CASE_ERROR_PENALTY_FOR_EXACT_MATCH;
+    static const float ACCENT_ERROR_PENALTY_FOR_EXACT_MATCH;
+    static const float DIGRAPH_PENALTY_FOR_EXACT_MATCH;
+
     // Numerically optimized parameters (currently for tap typing only).
     // TODO: add ability to modify these constants programmatically.
     // TODO: explore optimization of gesture parameters.
diff --git a/native/jni/src/suggest/policyimpl/typing/typing_scoring.h b/native/jni/src/suggest/policyimpl/typing/typing_scoring.h
index 56ffcc9..186e3ba 100644
--- a/native/jni/src/suggest/policyimpl/typing/typing_scoring.h
+++ b/native/jni/src/suggest/policyimpl/typing/typing_scoring.h
@@ -18,7 +18,9 @@
 #define LATINIME_TYPING_SCORING_H
 
 #include "defines.h"
+#include "suggest/core/dictionary/error_type_utils.h"
 #include "suggest/core/policy/scoring.h"
+#include "suggest/core/session/dic_traverse_session.h"
 #include "suggest/policyimpl/typing/scoring_params.h"
 
 namespace latinime {
@@ -52,12 +54,26 @@
     }
 
     AK_FORCE_INLINE int calculateFinalScore(const float compoundDistance,
-            const int inputSize, const bool forceCommit) const {
+            const int inputSize, const ErrorTypeUtils::ErrorType containedErrorTypes,
+            const bool forceCommit) const {
         const float maxDistance = ScoringParams::DISTANCE_WEIGHT_LANGUAGE
                 + static_cast<float>(inputSize) * ScoringParams::TYPING_MAX_OUTPUT_SCORE_PER_INPUT;
-        const float score = ScoringParams::TYPING_BASE_OUTPUT_SCORE
-                - compoundDistance / maxDistance
-                + (forceCommit ? ScoringParams::AUTOCORRECT_OUTPUT_THRESHOLD : 0.0f);
+        float score = ScoringParams::TYPING_BASE_OUTPUT_SCORE - compoundDistance / maxDistance;
+        if (forceCommit) {
+            score += ScoringParams::AUTOCORRECT_OUTPUT_THRESHOLD;
+        }
+        if (ErrorTypeUtils::isExactMatch(containedErrorTypes)) {
+            score += ScoringParams::EXACT_MATCH_PROMOTION;
+            if ((ErrorTypeUtils::MATCH_WITH_CASE_ERROR & containedErrorTypes) != 0) {
+                score -= ScoringParams::CASE_ERROR_PENALTY_FOR_EXACT_MATCH;
+            }
+            if ((ErrorTypeUtils::MATCH_WITH_ACCENT_ERROR & containedErrorTypes) != 0) {
+                score -= ScoringParams::ACCENT_ERROR_PENALTY_FOR_EXACT_MATCH;
+            }
+            if ((ErrorTypeUtils::MATCH_WITH_DIGRAPH & containedErrorTypes) != 0) {
+                score -= ScoringParams::DIGRAPH_PENALTY_FOR_EXACT_MATCH;
+            }
+        }
         return static_cast<int>(score * SUGGEST_INTERFACE_OUTPUT_SCALE);
     }
 
@@ -71,6 +87,16 @@
         return false;
     }
 
+    AK_FORCE_INLINE bool autoCorrectsToMultiWordSuggestionIfTop() const {
+        return true;
+    }
+
+    AK_FORCE_INLINE bool sameAsTyped(
+            const DicTraverseSession *const traverseSession, const DicNode *const dicNode) const {
+        return traverseSession->getProximityInfoState(0)->sameAsTyped(
+                dicNode->getOutputWordBuf(), dicNode->getNodeCodePointCount());
+    }
+
  private:
     DISALLOW_COPY_AND_ASSIGN(TypingScoring);
     static const TypingScoring sInstance;
diff --git a/native/jni/src/suggest/policyimpl/typing/typing_traversal.h b/native/jni/src/suggest/policyimpl/typing/typing_traversal.h
index 007c19e..3db00ad 100644
--- a/native/jni/src/suggest/policyimpl/typing/typing_traversal.h
+++ b/native/jni/src/suggest/policyimpl/typing/typing_traversal.h
@@ -81,7 +81,7 @@
             return false;
         }
         const int point0Index = dicNode->getInputIndex(0);
-        return dicNode->isTerminalWordNode()
+        return dicNode->isTerminalDicNode()
                 && traverseSession->getProximityInfoState(0)->
                         hasSpaceProximity(point0Index);
     }
@@ -96,7 +96,7 @@
         if (dicNode->isCompletion(inputSize)) {
             return false;
         }
-        if (!dicNode->isTerminalWordNode()) {
+        if (!dicNode->isTerminalDicNode()) {
             return false;
         }
         const int16_t pointIndex = dicNode->getInputIndex(0);
@@ -137,20 +137,10 @@
         return ScoringParams::MAX_SPATIAL_DISTANCE;
     }
 
-    AK_FORCE_INLINE bool autoCorrectsToMultiWordSuggestionIfTop() const {
-        return true;
-    }
-
     AK_FORCE_INLINE int getDefaultExpandDicNodeSize() const {
         return DicNodeVector::DEFAULT_NODES_SIZE_FOR_OPTIMIZATION;
     }
 
-    AK_FORCE_INLINE bool sameAsTyped(
-            const DicTraverseSession *const traverseSession, const DicNode *const dicNode) const {
-        return traverseSession->getProximityInfoState(0)->sameAsTyped(
-                dicNode->getOutputWordBuf(), dicNode->getNodeCodePointCount());
-    }
-
     AK_FORCE_INLINE int getMaxCacheSize(const int inputSize) const {
         return (inputSize <= 1) ? ScoringParams::MAX_CACHE_DIC_NODE_SIZE_FOR_SINGLE_POINT
                 : ScoringParams::MAX_CACHE_DIC_NODE_SIZE;
diff --git a/native/jni/src/suggest/policyimpl/typing/typing_weighting.cpp b/native/jni/src/suggest/policyimpl/typing/typing_weighting.cpp
index 5b6b5e8..54f65c7 100644
--- a/native/jni/src/suggest/policyimpl/typing/typing_weighting.cpp
+++ b/native/jni/src/suggest/policyimpl/typing/typing_weighting.cpp
@@ -23,39 +23,64 @@
 
 const TypingWeighting TypingWeighting::sInstance;
 
-ErrorType TypingWeighting::getErrorType(const CorrectionType correctionType,
+ErrorTypeUtils::ErrorType TypingWeighting::getErrorType(const CorrectionType correctionType,
         const DicTraverseSession *const traverseSession, const DicNode *const parentDicNode,
         const DicNode *const dicNode) const {
     switch (correctionType) {
         case CT_MATCH:
             if (isProximityDicNode(traverseSession, dicNode)) {
-                return ET_PROXIMITY_CORRECTION;
+                return ErrorTypeUtils::PROXIMITY_CORRECTION;
+            } else if (dicNode->isInDigraph()) {
+                return ErrorTypeUtils::MATCH_WITH_DIGRAPH;
             } else {
-                return ET_NOT_AN_ERROR;
+                // Compare the node code point with original primary code point on the keyboard.
+                const ProximityInfoState *const pInfoState =
+                        traverseSession->getProximityInfoState(0);
+                const int primaryOriginalCodePoint = pInfoState->getPrimaryOriginalCodePointAt(
+                        dicNode->getInputIndex(0));
+                const int nodeCodePoint = dicNode->getNodeCodePoint();
+                if (primaryOriginalCodePoint == nodeCodePoint) {
+                    // Node code point is same as original code point on the keyboard.
+                    return ErrorTypeUtils::NOT_AN_ERROR;
+                } else if (CharUtils::toLowerCase(primaryOriginalCodePoint) ==
+                        CharUtils::toLowerCase(nodeCodePoint)) {
+                    // Only cases of the code points are different.
+                    return ErrorTypeUtils::MATCH_WITH_CASE_ERROR;
+                } else if (CharUtils::toBaseCodePoint(primaryOriginalCodePoint) ==
+                        CharUtils::toBaseCodePoint(nodeCodePoint)) {
+                    // Node code point is a variant of original code point.
+                    return ErrorTypeUtils::MATCH_WITH_ACCENT_ERROR;
+                } else {
+                    // Node code point is a variant of original code point and the cases are also
+                    // different.
+                    return ErrorTypeUtils::MATCH_WITH_ACCENT_ERROR
+                            | ErrorTypeUtils::MATCH_WITH_CASE_ERROR;
+                }
             }
+            break;
         case CT_ADDITIONAL_PROXIMITY:
-            return ET_PROXIMITY_CORRECTION;
+            return  ErrorTypeUtils::PROXIMITY_CORRECTION;
         case CT_OMISSION:
             if (parentDicNode->canBeIntentionalOmission()) {
-                return ET_INTENTIONAL_OMISSION;
+                return ErrorTypeUtils::INTENTIONAL_OMISSION;
             } else {
-                return ET_EDIT_CORRECTION;
+                return ErrorTypeUtils::EDIT_CORRECTION;
             }
             break;
         case CT_SUBSTITUTION:
         case CT_INSERTION:
         case CT_TERMINAL_INSERTION:
         case CT_TRANSPOSITION:
-            return ET_EDIT_CORRECTION;
+            return ErrorTypeUtils::EDIT_CORRECTION;
         case CT_NEW_WORD_SPACE_OMISSION:
         case CT_NEW_WORD_SPACE_SUBSTITUTION:
-            return ET_NEW_WORD;
+            return ErrorTypeUtils::NEW_WORD;
         case CT_TERMINAL:
-            return ET_NOT_AN_ERROR;
+            return ErrorTypeUtils::NOT_AN_ERROR;
         case CT_COMPLETION:
-            return ET_COMPLETION;
+            return ErrorTypeUtils::COMPLETION;
         default:
-            return ET_NOT_AN_ERROR;
+            return ErrorTypeUtils::NOT_AN_ERROR;
     }
 }
 }  // namespace latinime
diff --git a/native/jni/src/suggest/policyimpl/typing/typing_weighting.h b/native/jni/src/suggest/policyimpl/typing/typing_weighting.h
index 9f0a331..41314ef 100644
--- a/native/jni/src/suggest/policyimpl/typing/typing_weighting.h
+++ b/native/jni/src/suggest/policyimpl/typing/typing_weighting.h
@@ -19,6 +19,7 @@
 
 #include "defines.h"
 #include "suggest/core/dicnode/dic_node_utils.h"
+#include "suggest/core/dictionary/error_type_utils.h"
 #include "suggest/core/layout/touch_position_correction_utils.h"
 #include "suggest/core/policy/weighting.h"
 #include "suggest/core/session/dic_traverse_session.h"
@@ -204,7 +205,7 @@
         return cost * traverseSession->getMultiWordCostMultiplier();
     }
 
-    ErrorType getErrorType(const CorrectionType correctionType,
+    ErrorTypeUtils::ErrorType getErrorType(const CorrectionType correctionType,
             const DicTraverseSession *const traverseSession,
             const DicNode *const parentDicNode, const DicNode *const dicNode) const;
 
diff --git a/native/jni/src/utils/exclusive_ownership_pointer.h b/native/jni/src/utils/exclusive_ownership_pointer.h
new file mode 100644
index 0000000..081802e
--- /dev/null
+++ b/native/jni/src/utils/exclusive_ownership_pointer.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H
+#define LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H
+
+#include "defines.h"
+
+namespace latinime {
+
+template<class T>
+class ExclusiveOwnershipPointer {
+ public:
+    // This instance become an owner of the raw pointer.
+    AK_FORCE_INLINE ExclusiveOwnershipPointer(T *const rawPointer)
+            : mPointer(rawPointer),
+              mSharedOwnerPtr(new (ExclusiveOwnershipPointer<T> *)(this)) {}
+
+    // Move the ownership.
+    AK_FORCE_INLINE ExclusiveOwnershipPointer(const ExclusiveOwnershipPointer<T> &pointer)
+            : mPointer(pointer.mPointer), mSharedOwnerPtr(pointer.mSharedOwnerPtr) {
+        transferOwnership(&pointer);
+    }
+
+    AK_FORCE_INLINE ~ExclusiveOwnershipPointer() {
+        deletePointersIfHavingOwnership();
+    }
+
+    AK_FORCE_INLINE T *get() const {
+        return mPointer;
+    }
+
+ private:
+    // This class allows to copy and ensures only one instance has the ownership of the
+    // managed pointer.
+    DISALLOW_DEFAULT_CONSTRUCTOR(ExclusiveOwnershipPointer);
+    DISALLOW_ASSIGNMENT_OPERATOR(ExclusiveOwnershipPointer);
+
+    void transferOwnership(const ExclusiveOwnershipPointer<T> *const src) {
+        if (*mSharedOwnerPtr != src) {
+           AKLOGE("Failed to transfer the ownership because src is not the current owner."
+                   "src: %p, owner: %p", src, *mSharedOwnerPtr);
+           ASSERT(false);
+           return;
+        }
+        // Transfer the ownership from src to this instance.
+        *mSharedOwnerPtr = this;
+    }
+
+    void deletePointersIfHavingOwnership() {
+        if (mSharedOwnerPtr && *mSharedOwnerPtr == this) {
+            if (mPointer) {
+                if (DEBUG_DICT) {
+                    AKLOGI("Releasing pointer: %p", mPointer);
+                }
+                delete mPointer;
+            }
+            delete mSharedOwnerPtr;
+        }
+    }
+
+    T *mPointer;
+    // mSharedOwnerPtr points a shared memory space where the instance which has the ownership is
+    // stored.
+    ExclusiveOwnershipPointer<T> **mSharedOwnerPtr;
+};
+} // namespace latinime
+#endif /* LATINIME_EXCLUSIVE_OWNERSHIP_POINTER_H */
diff --git a/native/jni/src/utils/time_keeper.cpp b/native/jni/src/utils/time_keeper.cpp
new file mode 100644
index 0000000..0262840
--- /dev/null
+++ b/native/jni/src/utils/time_keeper.cpp
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "utils/time_keeper.h"
+
+#include <ctime>
+
+namespace latinime {
+
+int TimeKeeper::sCurrentTime;
+bool TimeKeeper::sSetForTesting;
+
+/* static  */ void TimeKeeper::setCurrentTime() {
+    if (!sSetForTesting) {
+        sCurrentTime = time(0);
+    }
+}
+
+/* static */ void TimeKeeper::startTestModeWithForceCurrentTime(const int currentTime) {
+    sCurrentTime = currentTime;
+    sSetForTesting = true;
+}
+
+/* static */ void TimeKeeper::stopTestMode() {
+    sSetForTesting = false;
+}
+
+} // namespace latinime
diff --git a/native/jni/src/utils/time_keeper.h b/native/jni/src/utils/time_keeper.h
new file mode 100644
index 0000000..d066757
--- /dev/null
+++ b/native/jni/src/utils/time_keeper.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_TIME_KEEPER_H
+#define LATINIME_TIME_KEEPER_H
+
+#include "defines.h"
+
+namespace latinime {
+
+class TimeKeeper {
+ public:
+    static void setCurrentTime();
+
+    static void startTestModeWithForceCurrentTime(const int currentTime);
+
+    static void stopTestMode();
+
+    static int peekCurrentTime() { return sCurrentTime; };
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(TimeKeeper);
+
+    static int sCurrentTime;
+    static bool sSetForTesting;
+};
+} // namespace latinime
+#endif /* LATINIME_TIME_KEEPER_H */
diff --git a/tests/AndroidManifest.xml b/tests/AndroidManifest.xml
index 09a63c5..4ca846b 100644
--- a/tests/AndroidManifest.xml
+++ b/tests/AndroidManifest.xml
@@ -17,7 +17,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.inputmethod.latin.tests">
 
-    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="17" />
+    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="19" />
 
     <uses-permission android:name="android.permission.READ_CONTACTS" />
 
diff --git a/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserSplitTests.java b/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserSplitTests.java
index 2eb448c..cbe2d59 100644
--- a/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserSplitTests.java
+++ b/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserSplitTests.java
@@ -116,6 +116,16 @@
     private static final String SURROGATE1 = PAIR1 + PAIR2;
     private static final String SURROGATE2 = PAIR1 + PAIR2 + PAIR3;
 
+    public void testResolveNullText() {
+        assertNull("resolve null", KeySpecParser.resolveTextReference(
+                null, mTextsSet));
+    }
+
+    public void testResolveEmptyText() {
+        assertNull("resolve empty text", KeySpecParser.resolveTextReference(
+                "!text/empty_string", mTextsSet));
+    }
+
     public void testSplitZero() {
         assertTextArray("Empty string", "");
         assertTextArray("Empty entry", ",");
diff --git a/tests/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueueTests.java b/tests/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueueTests.java
index 279559c..7908b26 100644
--- a/tests/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueueTests.java
+++ b/tests/src/com/android/inputmethod/keyboard/internal/PointerTrackerQueueTests.java
@@ -27,7 +27,7 @@
 
         public final int mId;
         public boolean mIsModifier;
-        public boolean mIsInSlidingKeyInput;
+        public boolean mIsInDraggingFinger;
         public long mPhantomUpEventTime = NOT_HAPPENED;
 
         public Element(int id) {
@@ -40,8 +40,8 @@
         }
 
         @Override
-        public boolean isInSlidingKeyInput() {
-            return mIsInSlidingKeyInput;
+        public boolean isInDraggingFinger() {
+            return mIsInDraggingFinger;
         }
 
         @Override
@@ -297,19 +297,19 @@
         assertEquals(Element.NOT_HAPPENED, mElement4.mPhantomUpEventTime);
     }
 
-    public void testIsAnyInSlidingKeyInput() {
+    public void testIsAnyInDraggingFinger() {
         Element.sPhantomUpCount = 0;
-        assertFalse(mQueue.isAnyInSlidingKeyInput());
+        assertFalse(mQueue.isAnyInDraggingFinger());
 
         mQueue.add(mElement1);
         mQueue.add(mElement2);
         mQueue.add(mElement3);
         mQueue.add(mElement4);
 
-        assertFalse(mQueue.isAnyInSlidingKeyInput());
+        assertFalse(mQueue.isAnyInDraggingFinger());
 
-        mElement3.mIsInSlidingKeyInput = true;
-        assertTrue(mQueue.isAnyInSlidingKeyInput());
+        mElement3.mIsInDraggingFinger = true;
+        assertTrue(mQueue.isAnyInDraggingFinger());
 
         assertEquals(0, Element.sPhantomUpCount);
         assertEquals(4, mQueue.size());
diff --git a/tests/src/com/android/inputmethod/latin/AppWorkaroundsTests.java b/tests/src/com/android/inputmethod/latin/AppWorkaroundsTests.java
new file mode 100644
index 0000000..c29257d
--- /dev/null
+++ b/tests/src/com/android/inputmethod/latin/AppWorkaroundsTests.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin;
+
+import com.android.inputmethod.latin.settings.Settings;
+
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.os.Build.VERSION_CODES;
+import android.test.suitebuilder.annotation.LargeTest;
+import android.view.inputmethod.EditorInfo;
+
+@LargeTest
+public class AppWorkaroundsTests extends InputTestsBase {
+    String packageNameOfAppBeforeJellyBean;
+    String packageNameOfAppAfterJellyBean;
+
+    @Override
+    protected void setUp() throws Exception {
+        // NOTE: this will fail if there is no app installed that targets an SDK
+        // before Jelly Bean. For the moment, it's fine.
+        final PackageManager pm = getContext().getPackageManager();
+        for (ApplicationInfo ai : pm.getInstalledApplications(0 /* flags */)) {
+            if (ai.targetSdkVersion < VERSION_CODES.JELLY_BEAN) {
+                packageNameOfAppBeforeJellyBean = ai.packageName;
+            } else {
+                packageNameOfAppAfterJellyBean = ai.packageName;
+            }
+        }
+        super.setUp();
+    }
+
+    // We want to test if the app package info is correctly retrieved by LatinIME. Since it
+    // asks this information to the package manager from the package name, and that it takes
+    // the package name from the EditorInfo, all we have to do it put the correct package
+    // name in the editor info.
+    // To this end, our base class InputTestsBase offers a hook for us to touch the EditorInfo.
+    // We override this hook to write the package name that we need.
+    @Override
+    protected EditorInfo enrichEditorInfo(final EditorInfo ei) {
+        if ("testBeforeJellyBeanTrue".equals(getName())) {
+            ei.packageName = packageNameOfAppBeforeJellyBean;
+        } else if ("testBeforeJellyBeanFalse".equals(getName())) {
+            ei.packageName = packageNameOfAppAfterJellyBean;
+        }
+        return ei;
+    }
+
+    public void testBeforeJellyBeanTrue() {
+        assertTrue("Couldn't successfully detect this app targets < Jelly Bean (package is "
+                + packageNameOfAppBeforeJellyBean + ")",
+                Settings.getInstance().getCurrent().isBeforeJellyBean());
+    }
+
+    public void testBeforeJellyBeanFalse() {
+        assertFalse("Couldn't successfully detect this app targets >= Jelly Bean (package is "
+                + packageNameOfAppAfterJellyBean + ")",
+                Settings.getInstance().getCurrent().isBeforeJellyBean());
+    }
+}
\ No newline at end of file
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
index cd5384e..098b211 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryDecayingTests.java
@@ -22,6 +22,7 @@
 
 import com.android.inputmethod.latin.makedict.CodePointUtils;
 import com.android.inputmethod.latin.makedict.FormatSpec;
+import com.android.inputmethod.latin.utils.FileUtils;
 
 import java.io.File;
 import java.io.IOException;
@@ -30,6 +31,7 @@
 import java.util.Locale;
 import java.util.Map;
 import java.util.Random;
+import java.util.concurrent.TimeUnit;
 
 @LargeTest
 public class BinaryDictionaryDecayingTests extends AndroidTestCase {
@@ -37,61 +39,143 @@
     private static final String TEST_LOCALE = "test";
 
     // Note that these are corresponding definitions in native code in
-    // latinime::DynamicPatriciaTriePolicy.
-    private static final String SET_NEEDS_TO_DECAY_FOR_TESTING_KEY =
-            "SET_NEEDS_TO_DECAY_FOR_TESTING";
+    // latinime::Ver4PatriciaTriePolicy.
+    private static final String SET_CURRENT_TIME_FOR_TESTING_QUERY =
+            "SET_CURRENT_TIME_FOR_TESTING";
+    private static final String GET_CURRENT_TIME_QUERY = "GET_CURRENT_TIME";
+    private static final String QUIT_TIMEKEEPER_TEST_MODE_QUERY = "QUIT_TIMEKEEPER_TEST_MODE";
 
     private static final int DUMMY_PROBABILITY = 0;
 
+    private int mCurrentTime = 0;
+
     @Override
     protected void setUp() throws Exception {
         super.setUp();
+        mCurrentTime = 0;
     }
 
     @Override
     protected void tearDown() throws Exception {
         super.tearDown();
+        try {
+            final File dictFile =
+                    createEmptyDictionaryAndGetFile("TestBinaryDictionary", FormatSpec.VERSION4);
+            final BinaryDictionary binaryDictionary =
+                    new BinaryDictionary(dictFile.getAbsolutePath(), 0 /* offset */,
+                            dictFile.length(), true /* useFullEditDistance */, Locale.getDefault(),
+                            TEST_LOCALE, true /* isUpdatable */);
+            binaryDictionary.getPropertyForTests(QUIT_TIMEKEEPER_TEST_MODE_QUERY);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+    }
+
+    private void addUnigramWord(final BinaryDictionary binaryDictionary, final String word,
+            final int probability) {
+        binaryDictionary.addUnigramWord(word, probability, "" /* shortcutTarget */,
+                BinaryDictionary.NOT_A_PROBABILITY /* shortcutProbability */,
+                false /* isNotAWord */, false /* isBlacklisted */,
+                mCurrentTime /* timestamp */);
+    }
+
+    private void addBigramWords(final BinaryDictionary binaryDictionary, final String word0,
+            final String word1, final int probability) {
+        binaryDictionary.addBigramWords(word0, word1, probability,
+                mCurrentTime /* timestamp */);
     }
 
     private void forcePassingShortTime(final BinaryDictionary binaryDictionary) {
-        // Entries having low probability would be suppressed once in 3 GCs.
-        final int count = 3;
-        for (int i = 0; i < count; i++) {
-            binaryDictionary.getPropertyForTests(SET_NEEDS_TO_DECAY_FOR_TESTING_KEY);
-            binaryDictionary.flushWithGC();
-        }
+        // 4 days.
+        final int timeToElapse = (int)TimeUnit.SECONDS.convert(4, TimeUnit.DAYS);
+        mCurrentTime += timeToElapse;
+        setCurrentTime(binaryDictionary, mCurrentTime);
+        binaryDictionary.flushWithGC();
     }
 
     private void forcePassingLongTime(final BinaryDictionary binaryDictionary) {
-        // Currently, probabilities are decayed when GC is run. All entries that have never been
-        // typed in 128 GCs would be removed.
-        final int count = 128;
-        for (int i = 0; i < count; i++) {
-            binaryDictionary.getPropertyForTests(SET_NEEDS_TO_DECAY_FOR_TESTING_KEY);
-            binaryDictionary.flushWithGC();
+        // 60 days.
+        final int timeToElapse = (int)TimeUnit.SECONDS.convert(60, TimeUnit.DAYS);
+        mCurrentTime += timeToElapse;
+        setCurrentTime(binaryDictionary, mCurrentTime);
+        binaryDictionary.flushWithGC();
+    }
+
+    private File createEmptyDictionaryAndGetFile(final String dictId,
+            final int formatVersion) throws IOException {
+        if (formatVersion == FormatSpec.VERSION4) {
+            return createEmptyVer4DictionaryAndGetFile(dictId);
+        } else {
+            throw new IOException("Dictionary format version " + formatVersion
+                    + " is not supported.");
+        }
+    }
+    private File createEmptyVer4DictionaryAndGetFile(final String dictId) throws IOException {
+        final File file = File.createTempFile(dictId, TEST_DICT_FILE_EXTENSION,
+                getContext().getCacheDir());
+        FileUtils.deleteRecursively(file);
+        Map<String, String> attributeMap = new HashMap<String, String>();
+        attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        attributeMap.put(FormatSpec.FileHeader.HAS_HISTORICAL_INFO_ATTRIBUTE,
+                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
+        if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
+                FormatSpec.VERSION4, attributeMap)) {
+            return file;
+        } else {
+            throw new IOException("Empty dictionary " + file.getAbsolutePath()
+                    + " cannot be created.");
         }
     }
 
-    private File createEmptyDictionaryAndGetFile(final String filename) throws IOException {
-        final File file = File.createTempFile(filename, TEST_DICT_FILE_EXTENSION,
-                getContext().getCacheDir());
-        Map<String, String> attributeMap = new HashMap<String, String>();
-        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
-                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
-        attributeMap.put(FormatSpec.FileHeader.USES_FORGETTING_CURVE_ATTRIBUTE,
-                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
-        if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
-                3 /* dictVersion */, attributeMap)) {
-            return file;
-        } else {
-            throw new IOException("Empty dictionary cannot be created.");
+    private static int getCurrentTime(final BinaryDictionary binaryDictionary) {
+        return Integer.parseInt(binaryDictionary.getPropertyForTests(GET_CURRENT_TIME_QUERY));
+    }
+
+    private static void setCurrentTime(final BinaryDictionary binaryDictionary,
+            final int currentTime) {
+        final String query = SET_CURRENT_TIME_FOR_TESTING_QUERY + ":" + currentTime;
+        binaryDictionary.getPropertyForTests(query);
+    }
+
+    public void testControlCurrentTime() {
+        testControlCurrentTime(FormatSpec.VERSION4);
+    }
+
+    private void testControlCurrentTime(final int formatVersion) {
+        final int TEST_COUNT = 1000;
+        final long seed = System.currentTimeMillis();
+        final Random random = new Random(seed);
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
         }
+        BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+        binaryDictionary.getPropertyForTests(QUIT_TIMEKEEPER_TEST_MODE_QUERY);
+        final int startTime = getCurrentTime(binaryDictionary);
+        for (int i = 0; i < TEST_COUNT; i++) {
+            final int currentTime = random.nextInt(Integer.MAX_VALUE);
+            setCurrentTime(binaryDictionary, currentTime);
+            assertEquals(currentTime, getCurrentTime(binaryDictionary));
+        }
+        binaryDictionary.getPropertyForTests(QUIT_TIMEKEEPER_TEST_MODE_QUERY);
+        final int endTime = getCurrentTime(binaryDictionary);
+        final int MAX_ALLOWED_ELAPSED_TIME = 10;
+        assertTrue(startTime <= endTime && endTime <= startTime + MAX_ALLOWED_ELAPSED_TIME);
     }
 
     public void testAddValidAndInvalidWords() {
+        testAddValidAndInvalidWords(FormatSpec.VERSION4);
+    }
+
+    private void testAddValidAndInvalidWords(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -99,36 +183,35 @@
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
 
-        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", Dictionary.NOT_A_PROBABILITY);
         assertFalse(binaryDictionary.isValidWord("a"));
-        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", Dictionary.NOT_A_PROBABILITY);
         assertFalse(binaryDictionary.isValidWord("a"));
-        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", Dictionary.NOT_A_PROBABILITY);
         assertFalse(binaryDictionary.isValidWord("a"));
-        binaryDictionary.addUnigramWord("a", Dictionary.NOT_A_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", Dictionary.NOT_A_PROBABILITY);
         assertTrue(binaryDictionary.isValidWord("a"));
 
-        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "b", DUMMY_PROBABILITY);
         assertTrue(binaryDictionary.isValidWord("b"));
 
-        final int unigramProbability = binaryDictionary.getFrequency("a");
-        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", Dictionary.NOT_A_PROBABILITY);
         assertFalse(binaryDictionary.isValidBigram("a", "b"));
-        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", Dictionary.NOT_A_PROBABILITY);
         assertFalse(binaryDictionary.isValidBigram("a", "b"));
-        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", Dictionary.NOT_A_PROBABILITY);
         assertFalse(binaryDictionary.isValidBigram("a", "b"));
-        binaryDictionary.addBigramWords("a", "b", Dictionary.NOT_A_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", Dictionary.NOT_A_PROBABILITY);
         assertTrue(binaryDictionary.isValidBigram("a", "b"));
 
-        binaryDictionary.addUnigramWord("c", DUMMY_PROBABILITY);
-        binaryDictionary.addBigramWords("a", "c", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "c", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "c", DUMMY_PROBABILITY);
         assertTrue(binaryDictionary.isValidBigram("a", "c"));
 
         // Add bigrams of not valid unigrams.
-        binaryDictionary.addBigramWords("x", "y", Dictionary.NOT_A_PROBABILITY);
+        addBigramWords(binaryDictionary, "x", "y", Dictionary.NOT_A_PROBABILITY);
         assertFalse(binaryDictionary.isValidBigram("x", "y"));
-        binaryDictionary.addBigramWords("x", "y", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "x", "y", DUMMY_PROBABILITY);
         assertFalse(binaryDictionary.isValidBigram("x", "y"));
 
         binaryDictionary.close();
@@ -136,9 +219,13 @@
     }
 
     public void testDecayingProbability() {
+        testDecayingProbability(FormatSpec.VERSION4);
+    }
+
+    private void testDecayingProbability(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -146,39 +233,44 @@
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
 
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
         assertTrue(binaryDictionary.isValidWord("a"));
         forcePassingShortTime(binaryDictionary);
         assertFalse(binaryDictionary.isValidWord("a"));
 
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        assertTrue(binaryDictionary.isValidWord("a"));
         forcePassingShortTime(binaryDictionary);
         assertTrue(binaryDictionary.isValidWord("a"));
         forcePassingLongTime(binaryDictionary);
         assertFalse(binaryDictionary.isValidWord("a"));
 
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
-        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "b", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", DUMMY_PROBABILITY);
         assertTrue(binaryDictionary.isValidBigram("a", "b"));
         forcePassingShortTime(binaryDictionary);
         assertFalse(binaryDictionary.isValidBigram("a", "b"));
 
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
-        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
-        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
-        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("a", DUMMY_PROBABILITY);
-        binaryDictionary.addUnigramWord("b", DUMMY_PROBABILITY);
-        binaryDictionary.addBigramWords("a", "b", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "b", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "b", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "b", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "b", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "a", DUMMY_PROBABILITY);
+        addUnigramWord(binaryDictionary, "b", DUMMY_PROBABILITY);
+        addBigramWords(binaryDictionary, "a", "b", DUMMY_PROBABILITY);
         assertTrue(binaryDictionary.isValidBigram("a", "b"));
         forcePassingShortTime(binaryDictionary);
         assertTrue(binaryDictionary.isValidBigram("a", "b"));
@@ -190,6 +282,10 @@
     }
 
     public void testAddManyUnigramsToDecayingDict() {
+        testAddManyUnigramsToDecayingDict(FormatSpec.VERSION4);
+    }
+
+    private void testAddManyUnigramsToDecayingDict(final int formatVersion) {
         final int unigramCount = 30000;
         final int unigramTypedCount = 100000;
         final int codePointSetSize = 50;
@@ -198,13 +294,14 @@
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+        setCurrentTime(binaryDictionary, mCurrentTime);
 
         final int[] codePointSet = CodePointUtils.generateCodePointSet(codePointSetSize, random);
         final ArrayList<String> words = new ArrayList<String>();
@@ -218,14 +315,14 @@
                 binaryDictionary.getPropertyForTests(BinaryDictionary.MAX_UNIGRAM_COUNT_QUERY));
         for (int i = 0; i < unigramTypedCount; i++) {
             final String word = words.get(random.nextInt(words.size()));
-            binaryDictionary.addUnigramWord(word, DUMMY_PROBABILITY);
+            addUnigramWord(binaryDictionary, word, DUMMY_PROBABILITY);
 
             if (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
                 final int unigramCountBeforeGC =
                         Integer.parseInt(binaryDictionary.getPropertyForTests(
                                 BinaryDictionary.UNIGRAM_COUNT_QUERY));
                 while (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
-                    binaryDictionary.flushWithGC();
+                    forcePassingShortTime(binaryDictionary);
                 }
                 final int unigramCountAfterGC =
                         Integer.parseInt(binaryDictionary.getPropertyForTests(
@@ -238,9 +335,75 @@
                 BinaryDictionary.UNIGRAM_COUNT_QUERY)) > 0);
         assertTrue(Integer.parseInt(binaryDictionary.getPropertyForTests(
                 BinaryDictionary.UNIGRAM_COUNT_QUERY)) <= maxUnigramCount);
+        forcePassingLongTime(binaryDictionary);
+        assertEquals(0, Integer.parseInt(binaryDictionary.getPropertyForTests(
+                BinaryDictionary.UNIGRAM_COUNT_QUERY)));
+    }
+
+    public void testOverflowUnigrams() {
+        testOverflowUnigrams(FormatSpec.VERSION4);
+    }
+
+    private void testOverflowUnigrams(final int formatVersion) {
+        final int unigramCount = 20000;
+        final int eachUnigramTypedCount = 5;
+        final int strongUnigramTypedCount = 20;
+        final int weakUnigramTypedCount = 1;
+        final int codePointSetSize = 50;
+        final long seed = System.currentTimeMillis();
+        final Random random = new Random(seed);
+
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+        BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+        setCurrentTime(binaryDictionary, mCurrentTime);
+        final int[] codePointSet = CodePointUtils.generateCodePointSet(codePointSetSize, random);
+
+        final String strong = "strong";
+        final String weak = "weak";
+        for (int j = 0; j < strongUnigramTypedCount; j++) {
+            addUnigramWord(binaryDictionary, strong, DUMMY_PROBABILITY);
+        }
+        for (int j = 0; j < weakUnigramTypedCount; j++) {
+            addUnigramWord(binaryDictionary, weak, DUMMY_PROBABILITY);
+        }
+        assertTrue(binaryDictionary.isValidWord(strong));
+        assertTrue(binaryDictionary.isValidWord(weak));
+
+        for (int i = 0; i < unigramCount; i++) {
+            final String word = CodePointUtils.generateWord(random, codePointSet);
+            for (int j = 0; j < eachUnigramTypedCount; j++) {
+                addUnigramWord(binaryDictionary, word, DUMMY_PROBABILITY);
+            }
+            if (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
+                final int unigramCountBeforeGC =
+                        Integer.parseInt(binaryDictionary.getPropertyForTests(
+                                BinaryDictionary.UNIGRAM_COUNT_QUERY));
+                assertTrue(binaryDictionary.isValidWord(strong));
+                assertTrue(binaryDictionary.isValidWord(weak));
+                binaryDictionary.flushWithGC();
+                final int unigramCountAfterGC =
+                        Integer.parseInt(binaryDictionary.getPropertyForTests(
+                                BinaryDictionary.UNIGRAM_COUNT_QUERY));
+                assertTrue(unigramCountBeforeGC > unigramCountAfterGC);
+                assertFalse(binaryDictionary.isValidWord(weak));
+                assertTrue(binaryDictionary.isValidWord(strong));
+                break;
+            }
+        }
     }
 
     public void testAddManyBigramsToDecayingDict() {
+        testAddManyBigramsToDecayingDict(FormatSpec.VERSION4);
+    }
+
+    private void testAddManyBigramsToDecayingDict(final int formatVersion) {
         final int unigramCount = 5000;
         final int bigramCount = 30000;
         final int bigramTypedCount = 100000;
@@ -250,13 +413,14 @@
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
         BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
                 0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+        setCurrentTime(binaryDictionary, mCurrentTime);
 
         final int[] codePointSet = CodePointUtils.generateCodePointSet(codePointSetSize, random);
         final ArrayList<String> words = new ArrayList<String>();
@@ -282,16 +446,16 @@
                 binaryDictionary.getPropertyForTests(BinaryDictionary.MAX_BIGRAM_COUNT_QUERY));
         for (int i = 0; i < bigramTypedCount; ++i) {
             final Pair<String, String> bigram = bigrams.get(random.nextInt(bigrams.size()));
-            binaryDictionary.addUnigramWord(bigram.first, DUMMY_PROBABILITY);
-            binaryDictionary.addUnigramWord(bigram.second, DUMMY_PROBABILITY);
-            binaryDictionary.addBigramWords(bigram.first, bigram.second, DUMMY_PROBABILITY);
+            addUnigramWord(binaryDictionary, bigram.first, DUMMY_PROBABILITY);
+            addUnigramWord(binaryDictionary, bigram.second, DUMMY_PROBABILITY);
+            addBigramWords(binaryDictionary, bigram.first, bigram.second, DUMMY_PROBABILITY);
 
             if (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
                 final int bigramCountBeforeGC =
                         Integer.parseInt(binaryDictionary.getPropertyForTests(
                                 BinaryDictionary.BIGRAM_COUNT_QUERY));
                 while (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
-                    binaryDictionary.flushWithGC();
+                    forcePassingShortTime(binaryDictionary);
                 }
                 final int bigramCountAfterGC =
                         Integer.parseInt(binaryDictionary.getPropertyForTests(
@@ -304,5 +468,87 @@
                 BinaryDictionary.BIGRAM_COUNT_QUERY)) > 0);
         assertTrue(Integer.parseInt(binaryDictionary.getPropertyForTests(
                 BinaryDictionary.BIGRAM_COUNT_QUERY)) <= maxBigramCount);
+        forcePassingLongTime(binaryDictionary);
+        assertEquals(0, Integer.parseInt(binaryDictionary.getPropertyForTests(
+                BinaryDictionary.BIGRAM_COUNT_QUERY)));
+    }
+
+    public void testOverflowBigrams() {
+        testOverflowBigrams(FormatSpec.VERSION4);
+    }
+
+    private void testOverflowBigrams(final int formatVersion) {
+        final int bigramCount = 20000;
+        final int unigramCount = 1000;
+        final int unigramTypedCount = 20;
+        final int eachBigramTypedCount = 5;
+        final int strongBigramTypedCount = 20;
+        final int weakBigramTypedCount = 1;
+        final int codePointSetSize = 50;
+        final long seed = System.currentTimeMillis();
+        final Random random = new Random(seed);
+
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+        BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+        setCurrentTime(binaryDictionary, mCurrentTime);
+        final int[] codePointSet = CodePointUtils.generateCodePointSet(codePointSetSize, random);
+
+        final ArrayList<String> words = new ArrayList<String>();
+        for (int i = 0; i < unigramCount; i++) {
+            final String word = CodePointUtils.generateWord(random, codePointSet);
+            words.add(word);
+            for (int j = 0; j < unigramTypedCount; j++) {
+                addUnigramWord(binaryDictionary, word, DUMMY_PROBABILITY);
+            }
+        }
+        final String strong = "strong";
+        final String weak = "weak";
+        final String target = "target";
+        for (int j = 0; j < unigramTypedCount; j++) {
+            addUnigramWord(binaryDictionary, strong, DUMMY_PROBABILITY);
+            addUnigramWord(binaryDictionary, weak, DUMMY_PROBABILITY);
+            addUnigramWord(binaryDictionary, target, DUMMY_PROBABILITY);
+        }
+        binaryDictionary.flushWithGC();
+        for (int j = 0; j < strongBigramTypedCount; j++) {
+            addBigramWords(binaryDictionary, strong, target, DUMMY_PROBABILITY);
+        }
+        for (int j = 0; j < weakBigramTypedCount; j++) {
+            addBigramWords(binaryDictionary, weak, target, DUMMY_PROBABILITY);
+        }
+        assertTrue(binaryDictionary.isValidBigram(strong, target));
+        assertTrue(binaryDictionary.isValidBigram(weak, target));
+
+        for (int i = 0; i < bigramCount; i++) {
+            final int word0Index = random.nextInt(words.size());
+            final String word0 = words.get(word0Index);
+            final int index = random.nextInt(words.size() - 1);
+            final int word1Index = (index >= word0Index) ? index + 1 : index;
+            final String word1 = words.get(word1Index);
+
+            for (int j = 0; j < eachBigramTypedCount; j++) {
+                addBigramWords(binaryDictionary, word0, word1, DUMMY_PROBABILITY);
+            }
+            if (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
+                final int bigramCountBeforeGC =
+                        Integer.parseInt(binaryDictionary.getPropertyForTests(
+                                BinaryDictionary.BIGRAM_COUNT_QUERY));
+                binaryDictionary.flushWithGC();
+                final int bigramCountAfterGC =
+                        Integer.parseInt(binaryDictionary.getPropertyForTests(
+                                BinaryDictionary.BIGRAM_COUNT_QUERY));
+                assertTrue(bigramCountBeforeGC > bigramCountAfterGC);
+                assertTrue(binaryDictionary.isValidBigram(strong, target));
+                assertFalse(binaryDictionary.isValidBigram(weak, target));
+                break;
+            }
+        }
     }
 }
diff --git a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
index 5b8f0e9..65c70a6 100644
--- a/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/BinaryDictionaryTests.java
@@ -21,8 +21,12 @@
 import android.text.TextUtils;
 import android.util.Pair;
 
+import com.android.inputmethod.latin.BinaryDictionary.LanguageModelParam;
 import com.android.inputmethod.latin.makedict.CodePointUtils;
 import com.android.inputmethod.latin.makedict.FormatSpec;
+import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
+import com.android.inputmethod.latin.utils.FileUtils;
+import com.android.inputmethod.latin.utils.UnigramProperty;
 
 import java.io.File;
 import java.io.IOException;
@@ -33,6 +37,7 @@
 import java.util.Map;
 import java.util.Random;
 
+// TODO Use the seed passed as an argument for makedict test.
 @LargeTest
 public class BinaryDictionaryTests extends AndroidTestCase {
     private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
@@ -48,24 +53,39 @@
         super.tearDown();
     }
 
-    private File createEmptyDictionaryAndGetFile(final String filename) throws IOException {
-        final File file = File.createTempFile(filename, TEST_DICT_FILE_EXTENSION,
+    private File createEmptyDictionaryAndGetFile(final String dictId,
+            final int formatVersion) throws IOException {
+       if (formatVersion == FormatSpec.VERSION4) {
+            return createEmptyVer4DictionaryAndGetFile(dictId);
+        } else {
+            throw new IOException("Dictionary format version " + formatVersion
+                    + " is not supported.");
+        }
+    }
+
+    private File createEmptyVer4DictionaryAndGetFile(final String dictId) throws IOException {
+        final File file = File.createTempFile(dictId, TEST_DICT_FILE_EXTENSION,
                 getContext().getCacheDir());
+        file.delete();
+        file.mkdir();
         Map<String, String> attributeMap = new HashMap<String, String>();
-        attributeMap.put(FormatSpec.FileHeader.SUPPORTS_DYNAMIC_UPDATE_ATTRIBUTE,
-                FormatSpec.FileHeader.ATTRIBUTE_VALUE_TRUE);
         if (BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
-                3 /* dictVersion */, attributeMap)) {
+                FormatSpec.VERSION4, attributeMap)) {
             return file;
         } else {
-            throw new IOException("Empty dictionary cannot be created.");
+            throw new IOException("Empty dictionary " + file.getAbsolutePath()
+                    + " cannot be created.");
         }
     }
 
     public void testIsValidDictionary() {
+        testIsValidDictionary(FormatSpec.VERSION4);
+    }
+
+    private void testIsValidDictionary(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -77,7 +97,7 @@
         binaryDictionary.close();
         assertFalse("binaryDictionary must be invalid after closing.",
                 binaryDictionary.isValidDictionary());
-        dictFile.delete();
+        FileUtils.deleteRecursively(dictFile);
         binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(), 0 /* offset */,
                 dictFile.length(), true /* useFullEditDistance */, Locale.getDefault(),
                 TEST_LOCALE, true /* isUpdatable */);
@@ -86,10 +106,28 @@
         binaryDictionary.close();
     }
 
+    private void addUnigramWord(final BinaryDictionary binaryDictionary, final String word,
+            final int probability) {
+        binaryDictionary.addUnigramWord(word, probability, "" /* shortcutTarget */,
+                BinaryDictionary.NOT_A_PROBABILITY /* shortcutProbability */,
+                false /* isNotAWord */, false /* isBlacklisted */,
+                BinaryDictionary.NOT_A_VALID_TIMESTAMP /* timestamp */);
+    }
+
+    private void addBigramWords(final BinaryDictionary binaryDictionary, final String word0,
+            final String word1, final int probability) {
+        binaryDictionary.addBigramWords(word0, word1, probability,
+                BinaryDictionary.NOT_A_VALID_TIMESTAMP /* timestamp */);
+    }
+
     public void testAddUnigramWord() {
+        testAddUnigramWord(FormatSpec.VERSION4);
+    }
+
+    private void testAddUnigramWord(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -98,21 +136,21 @@
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
 
         final int probability = 100;
-        binaryDictionary.addUnigramWord("aaa", probability);
+        addUnigramWord(binaryDictionary, "aaa", probability);
         // Reallocate and create.
-        binaryDictionary.addUnigramWord("aab", probability);
+        addUnigramWord(binaryDictionary, "aab", probability);
         // Insert into children.
-        binaryDictionary.addUnigramWord("aac", probability);
+        addUnigramWord(binaryDictionary, "aac", probability);
         // Make terminal.
-        binaryDictionary.addUnigramWord("aa", probability);
+        addUnigramWord(binaryDictionary, "aa", probability);
         // Create children.
-        binaryDictionary.addUnigramWord("aaaa", probability);
+        addUnigramWord(binaryDictionary, "aaaa", probability);
         // Reallocate and make termianl.
-        binaryDictionary.addUnigramWord("a", probability);
+        addUnigramWord(binaryDictionary, "a", probability);
 
         final int updatedProbability = 200;
         // Update.
-        binaryDictionary.addUnigramWord("aaa", updatedProbability);
+        addUnigramWord(binaryDictionary, "aaa", updatedProbability);
 
         assertEquals(probability, binaryDictionary.getFrequency("aab"));
         assertEquals(probability, binaryDictionary.getFrequency("aac"));
@@ -125,13 +163,17 @@
     }
 
     public void testRandomlyAddUnigramWord() {
+        testRandomlyAddUnigramWord(FormatSpec.VERSION4);
+    }
+
+    private void testRandomlyAddUnigramWord(final int formatVersion) {
         final int wordCount = 1000;
         final int codePointSetSize = 50;
         final long seed = System.currentTimeMillis();
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -148,7 +190,7 @@
             probabilityMap.put(word, random.nextInt(0xFF));
         }
         for (String word : probabilityMap.keySet()) {
-            binaryDictionary.addUnigramWord(word, probabilityMap.get(word));
+            addUnigramWord(binaryDictionary, word, probabilityMap.get(word));
         }
         for (String word : probabilityMap.keySet()) {
             assertEquals(word, (int)probabilityMap.get(word), binaryDictionary.getFrequency(word));
@@ -157,9 +199,13 @@
     }
 
     public void testAddBigramWords() {
+        testAddBigramWords(FormatSpec.VERSION4);
+    }
+
+    private void testAddBigramWords(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -170,13 +216,13 @@
         final int unigramProbability = 100;
         final int bigramProbability = 10;
         final int updatedBigramProbability = 15;
-        binaryDictionary.addUnigramWord("aaa", unigramProbability);
-        binaryDictionary.addUnigramWord("abb", unigramProbability);
-        binaryDictionary.addUnigramWord("bcc", unigramProbability);
-        binaryDictionary.addBigramWords("aaa", "abb", bigramProbability);
-        binaryDictionary.addBigramWords("aaa", "bcc", bigramProbability);
-        binaryDictionary.addBigramWords("abb", "aaa", bigramProbability);
-        binaryDictionary.addBigramWords("abb", "bcc", bigramProbability);
+        addUnigramWord(binaryDictionary, "aaa", unigramProbability);
+        addUnigramWord(binaryDictionary, "abb", unigramProbability);
+        addUnigramWord(binaryDictionary, "bcc", unigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "abb", bigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "bcc", bigramProbability);
+        addBigramWords(binaryDictionary, "abb", "aaa", bigramProbability);
+        addBigramWords(binaryDictionary, "abb", "bcc", bigramProbability);
 
         final int probability = binaryDictionary.calculateProbability(unigramProbability,
                 bigramProbability);
@@ -189,7 +235,7 @@
         assertEquals(probability, binaryDictionary.getBigramProbability("abb", "aaa"));
         assertEquals(probability, binaryDictionary.getBigramProbability("abb", "bcc"));
 
-        binaryDictionary.addBigramWords("aaa", "abb", updatedBigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "abb", updatedBigramProbability);
         final int updatedProbability = binaryDictionary.calculateProbability(unigramProbability,
                 updatedBigramProbability);
         assertEquals(updatedProbability, binaryDictionary.getBigramProbability("aaa", "abb"));
@@ -205,22 +251,26 @@
                 binaryDictionary.getBigramProbability("aaa", "aaa"));
 
         // Testing bigram link.
-        binaryDictionary.addUnigramWord("abcde", unigramProbability);
-        binaryDictionary.addUnigramWord("fghij", unigramProbability);
-        binaryDictionary.addBigramWords("abcde", "fghij", bigramProbability);
-        binaryDictionary.addUnigramWord("fgh", unigramProbability);
-        binaryDictionary.addUnigramWord("abc", unigramProbability);
-        binaryDictionary.addUnigramWord("f", unigramProbability);
+        addUnigramWord(binaryDictionary, "abcde", unigramProbability);
+        addUnigramWord(binaryDictionary, "fghij", unigramProbability);
+        addBigramWords(binaryDictionary, "abcde", "fghij", bigramProbability);
+        addUnigramWord(binaryDictionary, "fgh", unigramProbability);
+        addUnigramWord(binaryDictionary, "abc", unigramProbability);
+        addUnigramWord(binaryDictionary, "f", unigramProbability);
         assertEquals(probability, binaryDictionary.getBigramProbability("abcde", "fghij"));
         assertEquals(Dictionary.NOT_A_PROBABILITY,
                 binaryDictionary.getBigramProbability("abcde", "fgh"));
-        binaryDictionary.addBigramWords("abcde", "fghij", updatedBigramProbability);
+        addBigramWords(binaryDictionary, "abcde", "fghij", updatedBigramProbability);
         assertEquals(updatedProbability, binaryDictionary.getBigramProbability("abcde", "fghij"));
 
         dictFile.delete();
     }
 
     public void testRandomlyAddBigramWords() {
+        testRandomlyAddBigramWords(FormatSpec.VERSION4);
+    }
+
+    private void testRandomlyAddBigramWords(final int formatVersion) {
         final int wordCount = 100;
         final int bigramCount = 1000;
         final int codePointSetSize = 50;
@@ -229,7 +279,7 @@
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -249,7 +299,7 @@
             words.add(word);
             final int unigramProbability = random.nextInt(0xFF);
             unigramProbabilities.put(word, unigramProbability);
-            binaryDictionary.addUnigramWord(word, unigramProbability);
+            addUnigramWord(binaryDictionary, word, unigramProbability);
         }
 
         for (int i = 0; i < bigramCount; i++) {
@@ -262,7 +312,7 @@
             bigramWords.add(bigram);
             final int bigramProbability = random.nextInt(0xF);
             bigramProbabilities.put(bigram, bigramProbability);
-            binaryDictionary.addBigramWords(word0, word1, bigramProbability);
+            addBigramWords(binaryDictionary, word0, word1, bigramProbability);
         }
 
         for (final Pair<String, String> bigram : bigramWords) {
@@ -278,9 +328,13 @@
     }
 
     public void testRemoveBigramWords() {
+        testRemoveBigramWords(FormatSpec.VERSION4);
+    }
+
+    private void testRemoveBigramWords(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -289,13 +343,13 @@
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
         final int unigramProbability = 100;
         final int bigramProbability = 10;
-        binaryDictionary.addUnigramWord("aaa", unigramProbability);
-        binaryDictionary.addUnigramWord("abb", unigramProbability);
-        binaryDictionary.addUnigramWord("bcc", unigramProbability);
-        binaryDictionary.addBigramWords("aaa", "abb", bigramProbability);
-        binaryDictionary.addBigramWords("aaa", "bcc", bigramProbability);
-        binaryDictionary.addBigramWords("abb", "aaa", bigramProbability);
-        binaryDictionary.addBigramWords("abb", "bcc", bigramProbability);
+        addUnigramWord(binaryDictionary, "aaa", unigramProbability);
+        addUnigramWord(binaryDictionary, "abb", unigramProbability);
+        addUnigramWord(binaryDictionary, "bcc", unigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "abb", bigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "bcc", bigramProbability);
+        addBigramWords(binaryDictionary, "abb", "aaa", bigramProbability);
+        addBigramWords(binaryDictionary, "abb", "bcc", bigramProbability);
 
         assertEquals(true, binaryDictionary.isValidBigram("aaa", "abb"));
         assertEquals(true, binaryDictionary.isValidBigram("aaa", "bcc"));
@@ -304,7 +358,7 @@
 
         binaryDictionary.removeBigramWords("aaa", "abb");
         assertEquals(false, binaryDictionary.isValidBigram("aaa", "abb"));
-        binaryDictionary.addBigramWords("aaa", "abb", bigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "abb", bigramProbability);
         assertEquals(true, binaryDictionary.isValidBigram("aaa", "abb"));
 
 
@@ -324,9 +378,13 @@
     }
 
     public void testFlushDictionary() {
+        testFlushDictionary(FormatSpec.VERSION4);
+    }
+
+    private void testFlushDictionary(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -335,8 +393,8 @@
                 Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
 
         final int probability = 100;
-        binaryDictionary.addUnigramWord("aaa", probability);
-        binaryDictionary.addUnigramWord("abcd", probability);
+        addUnigramWord(binaryDictionary, "aaa", probability);
+        addUnigramWord(binaryDictionary, "abcd", probability);
         // Close without flushing.
         binaryDictionary.close();
 
@@ -347,8 +405,8 @@
         assertEquals(Dictionary.NOT_A_PROBABILITY, binaryDictionary.getFrequency("aaa"));
         assertEquals(Dictionary.NOT_A_PROBABILITY, binaryDictionary.getFrequency("abcd"));
 
-        binaryDictionary.addUnigramWord("aaa", probability);
-        binaryDictionary.addUnigramWord("abcd", probability);
+        addUnigramWord(binaryDictionary, "aaa", probability);
+        addUnigramWord(binaryDictionary, "abcd", probability);
         binaryDictionary.flush();
         binaryDictionary.close();
 
@@ -358,7 +416,7 @@
 
         assertEquals(probability, binaryDictionary.getFrequency("aaa"));
         assertEquals(probability, binaryDictionary.getFrequency("abcd"));
-        binaryDictionary.addUnigramWord("bcde", probability);
+        addUnigramWord(binaryDictionary, "bcde", probability);
         binaryDictionary.flush();
         binaryDictionary.close();
 
@@ -372,9 +430,13 @@
     }
 
     public void testFlushWithGCDictionary() {
+        testFlushWithGCDictionary(FormatSpec.VERSION4);
+    }
+
+    private void testFlushWithGCDictionary(final int formatVersion) {
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -384,13 +446,13 @@
 
         final int unigramProbability = 100;
         final int bigramProbability = 10;
-        binaryDictionary.addUnigramWord("aaa", unigramProbability);
-        binaryDictionary.addUnigramWord("abb", unigramProbability);
-        binaryDictionary.addUnigramWord("bcc", unigramProbability);
-        binaryDictionary.addBigramWords("aaa", "abb", bigramProbability);
-        binaryDictionary.addBigramWords("aaa", "bcc", bigramProbability);
-        binaryDictionary.addBigramWords("abb", "aaa", bigramProbability);
-        binaryDictionary.addBigramWords("abb", "bcc", bigramProbability);
+        addUnigramWord(binaryDictionary, "aaa", unigramProbability);
+        addUnigramWord(binaryDictionary, "abb", unigramProbability);
+        addUnigramWord(binaryDictionary, "bcc", unigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "abb", bigramProbability);
+        addBigramWords(binaryDictionary, "aaa", "bcc", bigramProbability);
+        addBigramWords(binaryDictionary, "abb", "aaa", bigramProbability);
+        addBigramWords(binaryDictionary, "abb", "bcc", bigramProbability);
         binaryDictionary.flushWithGC();
         binaryDictionary.close();
 
@@ -415,8 +477,12 @@
         dictFile.delete();
     }
 
-    // TODO: Evaluate performance of GC
     public void testAddBigramWordsAndFlashWithGC() {
+        testAddBigramWordsAndFlashWithGC(FormatSpec.VERSION4);
+    }
+
+    // TODO: Evaluate performance of GC
+    private void testAddBigramWordsAndFlashWithGC(final int formatVersion) {
         final int wordCount = 100;
         final int bigramCount = 1000;
         final int codePointSetSize = 30;
@@ -425,7 +491,7 @@
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -446,7 +512,7 @@
             words.add(word);
             final int unigramProbability = random.nextInt(0xFF);
             unigramProbabilities.put(word, unigramProbability);
-            binaryDictionary.addUnigramWord(word, unigramProbability);
+            addUnigramWord(binaryDictionary, word, unigramProbability);
         }
 
         for (int i = 0; i < bigramCount; i++) {
@@ -459,7 +525,7 @@
             bigramWords.add(bigram);
             final int bigramProbability = random.nextInt(0xF);
             bigramProbabilities.put(bigram, bigramProbability);
-            binaryDictionary.addBigramWords(word0, word1, bigramProbability);
+            addBigramWords(binaryDictionary, word0, word1, bigramProbability);
         }
 
         binaryDictionary.flushWithGC();
@@ -480,7 +546,11 @@
         dictFile.delete();
     }
 
-    public void testRandomOperetionsAndFlashWithGC() {
+    public void testRandomOperationsAndFlashWithGC() {
+        testRandomOperationsAndFlashWithGC(FormatSpec.VERSION4);
+    }
+
+    private void testRandomOperationsAndFlashWithGC(final int formatVersion) {
         final int flashWithGCIterationCount = 50;
         final int operationCountInEachIteration = 200;
         final int initialUnigramCount = 100;
@@ -494,7 +564,7 @@
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -513,7 +583,7 @@
             words.add(word);
             final int unigramProbability = random.nextInt(0xFF);
             unigramProbabilities.put(word, unigramProbability);
-            binaryDictionary.addUnigramWord(word, unigramProbability);
+            addUnigramWord(binaryDictionary, word, unigramProbability);
         }
         binaryDictionary.flushWithGC();
         binaryDictionary.close();
@@ -529,7 +599,7 @@
                     words.add(word);
                     final int unigramProbability = random.nextInt(0xFF);
                     unigramProbabilities.put(word, unigramProbability);
-                    binaryDictionary.addUnigramWord(word, unigramProbability);
+                    addUnigramWord(binaryDictionary, word, unigramProbability);
                 }
                 // Add bigram.
                 if (random.nextFloat() < addBigramProb && words.size() > 2) {
@@ -547,7 +617,7 @@
                     final Pair<String, String> bigram = new Pair<String, String>(word0, word1);
                     bigramWords.add(bigram);
                     bigramProbabilities.put(bigram, bigramProbability);
-                    binaryDictionary.addBigramWords(word0, word1, bigramProbability);
+                    addBigramWords(binaryDictionary, word0, word1, bigramProbability);
                 }
                 // Remove bigram.
                 if (random.nextFloat() < removeBigramProb && !bigramWords.isEmpty()) {
@@ -588,6 +658,10 @@
     }
 
     public void testAddManyUnigramsAndFlushWithGC() {
+        testAddManyUnigramsAndFlushWithGC(FormatSpec.VERSION4);
+    }
+
+    private void testAddManyUnigramsAndFlushWithGC(final int formatVersion) {
         final int flashWithGCIterationCount = 3;
         final int codePointSetSize = 50;
 
@@ -596,7 +670,7 @@
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -615,7 +689,7 @@
                 words.add(word);
                 final int unigramProbability = random.nextInt(0xFF);
                 unigramProbabilities.put(word, unigramProbability);
-                binaryDictionary.addUnigramWord(word, unigramProbability);
+                addUnigramWord(binaryDictionary, word, unigramProbability);
             }
 
             for (int j = 0; j < words.size(); j++) {
@@ -632,6 +706,10 @@
     }
 
     public void testUnigramAndBigramCount() {
+        testUnigramAndBigramCount(FormatSpec.VERSION4);
+    }
+
+    private void testUnigramAndBigramCount(final int formatVersion) {
         final int flashWithGCIterationCount = 10;
         final int codePointSetSize = 50;
         final int unigramCountPerIteration = 1000;
@@ -641,7 +719,7 @@
 
         File dictFile = null;
         try {
-            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary");
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
         } catch (IOException e) {
             fail("IOException while writing an initial dictionary : " + e);
         }
@@ -659,7 +737,7 @@
                 final String word = CodePointUtils.generateWord(random, codePointSet);
                 words.add(word);
                 final int unigramProbability = random.nextInt(0xFF);
-                binaryDictionary.addUnigramWord(word, unigramProbability);
+                addUnigramWord(binaryDictionary, word, unigramProbability);
             }
             for (int j = 0; j < bigramCountPerIteration; j++) {
                 final String word0 = words.get(random.nextInt(words.size()));
@@ -669,7 +747,7 @@
                 }
                 bigrams.add(new Pair<String, String>(word0, word1));
                 final int bigramProbability = random.nextInt(0xF);
-                binaryDictionary.addBigramWords(word0, word1, bigramProbability);
+                addBigramWords(binaryDictionary, word0, word1, bigramProbability);
             }
             assertEquals(new HashSet<String>(words).size(), Integer.parseInt(
                     binaryDictionary.getPropertyForTests(BinaryDictionary.UNIGRAM_COUNT_QUERY)));
@@ -685,4 +763,246 @@
 
         dictFile.delete();
     }
+
+    public void testAddMultipleDictionaryEntries() {
+        testAddMultipleDictionaryEntries(FormatSpec.VERSION4);
+    }
+
+    private void testAddMultipleDictionaryEntries(final int formatVersion) {
+        final int codePointSetSize = 20;
+        final int lmParamCount = 1000;
+        final double bigramContinueRate = 0.9;
+        final long seed = System.currentTimeMillis();
+        final Random random = new Random(seed);
+
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+
+        final int[] codePointSet = CodePointUtils.generateCodePointSet(codePointSetSize, random);
+        final HashMap<String, Integer> unigramProbabilities = new HashMap<String, Integer>();
+        final HashMap<Pair<String, String>, Integer> bigramProbabilities =
+                new HashMap<Pair<String, String>, Integer>();
+
+        final LanguageModelParam[] languageModelParams = new LanguageModelParam[lmParamCount];
+        String prevWord = null;
+        for (int i = 0; i < languageModelParams.length; i++) {
+            final String word = CodePointUtils.generateWord(random, codePointSet);
+            final int probability = random.nextInt(0xFF);
+            final int bigramProbability = random.nextInt(0xF);
+            unigramProbabilities.put(word, probability);
+            if (prevWord == null) {
+                languageModelParams[i] = new LanguageModelParam(word, probability,
+                        BinaryDictionary.NOT_A_VALID_TIMESTAMP);
+            } else {
+                languageModelParams[i] = new LanguageModelParam(prevWord, word, probability,
+                        bigramProbability, BinaryDictionary.NOT_A_VALID_TIMESTAMP);
+                bigramProbabilities.put(new Pair<String, String>(prevWord, word),
+                        bigramProbability);
+            }
+            prevWord = (random.nextDouble() < bigramContinueRate) ? word : null;
+        }
+
+        final BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+        binaryDictionary.addMultipleDictionaryEntries(languageModelParams);
+
+        for (Map.Entry<String, Integer> entry : unigramProbabilities.entrySet()) {
+            assertEquals((int)entry.getValue(), binaryDictionary.getFrequency(entry.getKey()));
+        }
+
+        for (Map.Entry<Pair<String, String>, Integer> entry : bigramProbabilities.entrySet()) {
+            final String word0 = entry.getKey().first;
+            final String word1 = entry.getKey().second;
+            final int unigramProbability = unigramProbabilities.get(word1);
+            final int bigramProbability = entry.getValue();
+            final int probability = binaryDictionary.calculateProbability(
+                    unigramProbability, bigramProbability);
+            assertEquals(probability, binaryDictionary.getBigramProbability(word0, word1));
+        }
+    }
+
+    public void testGetUnigramProperties() {
+        testGetUnigramProperties(FormatSpec.VERSION4);
+    }
+
+    private void testGetUnigramProperties(final int formatVersion) {
+        final long seed = System.currentTimeMillis();
+        final Random random = new Random(seed);
+        final int ITERATION_COUNT = 1000;
+        final int codePointSetSize = 20;
+        final int[] codePointSet = CodePointUtils.generateCodePointSet(codePointSetSize, random);
+
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+        final BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+
+        final UnigramProperty invalidUnigramProperty =
+                binaryDictionary.getUnigramProperty("dummyWord");
+        assertFalse(invalidUnigramProperty.isValid());
+
+        for (int i = 0; i < ITERATION_COUNT; i++) {
+            final String word = CodePointUtils.generateWord(random, codePointSet);
+            final int unigramProbability = random.nextInt(0xFF);
+            final boolean isNotAWord = random.nextBoolean();
+            final boolean isBlacklisted = random.nextBoolean();
+            // TODO: Add tests for historical info.
+            binaryDictionary.addUnigramWord(word, unigramProbability,
+                    null /* shortcutTarget */, BinaryDictionary.NOT_A_PROBABILITY,
+                    isNotAWord, isBlacklisted, BinaryDictionary.NOT_A_VALID_TIMESTAMP);
+            final UnigramProperty unigramProperty =
+                    binaryDictionary.getUnigramProperty(word);
+            assertEquals(word, unigramProperty.mCodePoints);
+            assertTrue(unigramProperty.isValid());
+            assertEquals(isNotAWord, unigramProperty.mIsNotAWord);
+            assertEquals(isBlacklisted, unigramProperty.mIsBlacklisted);
+            assertEquals(false, unigramProperty.mHasBigrams);
+            assertEquals(false, unigramProperty.mHasShortcuts);
+            assertEquals(unigramProbability, unigramProperty.mProbability);
+            assertTrue(unigramProperty.mShortcutTargets.isEmpty());
+        }
+    }
+
+    public void testAddShortcuts() {
+        testAddShortcuts(FormatSpec.VERSION4);
+    }
+
+    private void testAddShortcuts(final int formatVersion) {
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+        final BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+
+        final int unigramProbability = 100;
+        final int shortcutProbability = 10;
+        binaryDictionary.addUnigramWord("aaa", unigramProbability, "zzz",
+                shortcutProbability, false /* isNotAWord */, false /* isBlacklisted */,
+                0 /* timestamp */);
+        UnigramProperty unigramProperty = binaryDictionary.getUnigramProperty("aaa");
+        assertEquals(1, unigramProperty.mShortcutTargets.size());
+        assertEquals("zzz", unigramProperty.mShortcutTargets.get(0).mWord);
+        assertEquals(shortcutProbability, unigramProperty.mShortcutTargets.get(0).mFrequency);
+        final int updatedShortcutProbability = 2;
+        binaryDictionary.addUnigramWord("aaa", unigramProbability, "zzz",
+                updatedShortcutProbability, false /* isNotAWord */, false /* isBlacklisted */,
+                0 /* timestamp */);
+        unigramProperty = binaryDictionary.getUnigramProperty("aaa");
+        assertEquals(1, unigramProperty.mShortcutTargets.size());
+        assertEquals("zzz", unigramProperty.mShortcutTargets.get(0).mWord);
+        assertEquals(updatedShortcutProbability,
+                unigramProperty.mShortcutTargets.get(0).mFrequency);
+        binaryDictionary.addUnigramWord("aaa", unigramProbability, "yyy",
+                shortcutProbability, false /* isNotAWord */, false /* isBlacklisted */,
+                0 /* timestamp */);
+        final HashMap<String, Integer> shortcutTargets = new HashMap<String, Integer>();
+        shortcutTargets.put("zzz", updatedShortcutProbability);
+        shortcutTargets.put("yyy", shortcutProbability);
+        unigramProperty = binaryDictionary.getUnigramProperty("aaa");
+        assertEquals(2, unigramProperty.mShortcutTargets.size());
+        for (WeightedString shortcutTarget : unigramProperty.mShortcutTargets) {
+            assertTrue(shortcutTargets.containsKey(shortcutTarget.mWord));
+            assertEquals((int)shortcutTargets.get(shortcutTarget.mWord), shortcutTarget.mFrequency);
+            shortcutTargets.remove(shortcutTarget.mWord);
+        }
+        shortcutTargets.put("zzz", updatedShortcutProbability);
+        shortcutTargets.put("yyy", shortcutProbability);
+        binaryDictionary.flushWithGC();
+        unigramProperty = binaryDictionary.getUnigramProperty("aaa");
+        assertEquals(2, unigramProperty.mShortcutTargets.size());
+        for (WeightedString shortcutTarget : unigramProperty.mShortcutTargets) {
+            assertTrue(shortcutTargets.containsKey(shortcutTarget.mWord));
+            assertEquals((int)shortcutTargets.get(shortcutTarget.mWord), shortcutTarget.mFrequency);
+            shortcutTargets.remove(shortcutTarget.mWord);
+        }
+    }
+
+    public void testAddManyShortcuts() {
+        testAddManyShortcuts(FormatSpec.VERSION4);
+    }
+
+    private void testAddManyShortcuts(final int formatVersion) {
+        final long seed = System.currentTimeMillis();
+        final Random random = new Random(seed);
+        final int UNIGRAM_COUNT = 1000;
+        final int SHORTCUT_COUNT = 10000;
+        final int codePointSetSize = 20;
+        final int[] codePointSet = CodePointUtils.generateCodePointSet(codePointSetSize, random);
+
+        final ArrayList<String> words = new ArrayList<String>();
+        final HashMap<String, Integer> unigramProbabilities = new HashMap<String, Integer>();
+        final HashMap<String, HashMap<String, Integer>> shortcutTargets =
+                new HashMap<String, HashMap<String, Integer>>();
+
+        File dictFile = null;
+        try {
+            dictFile = createEmptyDictionaryAndGetFile("TestBinaryDictionary", formatVersion);
+        } catch (IOException e) {
+            fail("IOException while writing an initial dictionary : " + e);
+        }
+        final BinaryDictionary binaryDictionary = new BinaryDictionary(dictFile.getAbsolutePath(),
+                0 /* offset */, dictFile.length(), true /* useFullEditDistance */,
+                Locale.getDefault(), TEST_LOCALE, true /* isUpdatable */);
+
+        for (int i = 0; i < UNIGRAM_COUNT; i++) {
+            final String word = CodePointUtils.generateWord(random, codePointSet);
+            final int unigramProbability = random.nextInt(0xFF);
+            addUnigramWord(binaryDictionary, word, unigramProbability);
+            words.add(word);
+            unigramProbabilities.put(word, unigramProbability);
+            if (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
+                binaryDictionary.flushWithGC();
+            }
+        }
+        for (int i = 0; i < SHORTCUT_COUNT; i++) {
+            final String shortcutTarget = CodePointUtils.generateWord(random, codePointSet);
+            final int shortcutProbability = random.nextInt(0xF);
+            final String word = words.get(random.nextInt(words.size()));
+            final int unigramProbability = unigramProbabilities.get(word);
+            binaryDictionary.addUnigramWord(word, unigramProbability, shortcutTarget,
+                    shortcutProbability, false /* isNotAWord */, false /* isBlacklisted */,
+                    0 /* timestamp */);
+            if (shortcutTargets.containsKey(word)) {
+                final HashMap<String, Integer> shortcutTargetsOfWord = shortcutTargets.get(word);
+                shortcutTargetsOfWord.put(shortcutTarget, shortcutProbability);
+            } else {
+                final HashMap<String, Integer> shortcutTargetsOfWord =
+                        new HashMap<String, Integer>();
+                shortcutTargetsOfWord.put(shortcutTarget, shortcutProbability);
+                shortcutTargets.put(word, shortcutTargetsOfWord);
+            }
+            if (binaryDictionary.needsToRunGC(true /* mindsBlockByGC */)) {
+                binaryDictionary.flushWithGC();
+            }
+        }
+
+        for (final String word : words) {
+            final UnigramProperty unigramProperty = binaryDictionary.getUnigramProperty(word);
+            assertEquals((int)unigramProbabilities.get(word), unigramProperty.mProbability);
+            if (!shortcutTargets.containsKey(word)) {
+                // The word does not have shortcut targets.
+                continue;
+            }
+            assertEquals(shortcutTargets.get(word).size(), unigramProperty.mShortcutTargets.size());
+            for (final WeightedString shortcutTarget : unigramProperty.mShortcutTargets) {
+                final String targetCodePonts = shortcutTarget.mWord;
+                assertEquals((int)shortcutTargets.get(word).get(targetCodePonts),
+                        shortcutTarget.mFrequency);
+            }
+        }
+    }
 }
diff --git a/tests/src/com/android/inputmethod/latin/BlueUnderlineTests.java b/tests/src/com/android/inputmethod/latin/BlueUnderlineTests.java
index c4fd5a0..cdd8f6b 100644
--- a/tests/src/com/android/inputmethod/latin/BlueUnderlineTests.java
+++ b/tests/src/com/android/inputmethod/latin/BlueUnderlineTests.java
@@ -61,6 +61,7 @@
 
     public void testBlueUnderlineOnBackspace() {
         final String STRING_TO_TYPE = "tgis";
+        final int typedLength = STRING_TO_TYPE.length();
         final int EXPECTED_SUGGESTION_SPAN_START = -1;
         final int EXPECTED_UNDERLINE_SPAN_START = 0;
         final int EXPECTED_UNDERLINE_SPAN_END = 4;
@@ -68,6 +69,8 @@
         sleep(DELAY_TO_WAIT_FOR_UNDERLINE);
         runMessages();
         type(Constants.CODE_SPACE);
+        // typedLength + 1 because we also typed a space
+        mLatinIME.onUpdateSelection(0, 0, typedLength + 1, typedLength + 1, -1, -1);
         sleep(DELAY_TO_WAIT_FOR_UNDERLINE);
         runMessages();
         type(Constants.CODE_DELETE);
diff --git a/tests/src/com/android/inputmethod/latin/ExpandableDictionaryTests.java b/tests/src/com/android/inputmethod/latin/ExpandableDictionaryTests.java
deleted file mode 100644
index 6aae104..0000000
--- a/tests/src/com/android/inputmethod/latin/ExpandableDictionaryTests.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright (C) 2013 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin;
-
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
-
-/**
- * Unit test for ExpandableDictionary
- */
-@SmallTest
-public class ExpandableDictionaryTests extends AndroidTestCase {
-
-    private final static int UNIGRAM_FREQ = 50;
-    // See UserBinaryDictionary for more information about this variable.
-    // For tests, its actual value does not matter.
-    private final static int SHORTCUT_FREQ = 14;
-
-    public void testAddWordAndGetWordFrequency() {
-        final ExpandableDictionary dict = new ExpandableDictionary(Dictionary.TYPE_USER);
-
-        // Add words
-        dict.addWord("abcde", "abcde", UNIGRAM_FREQ, SHORTCUT_FREQ);
-        dict.addWord("abcef", null, UNIGRAM_FREQ + 1, 0);
-
-        // Check words
-        assertFalse(dict.isValidWord("abcde"));
-        assertEquals(UNIGRAM_FREQ, dict.getWordFrequency("abcde"));
-        assertTrue(dict.isValidWord("abcef"));
-        assertEquals(UNIGRAM_FREQ+1, dict.getWordFrequency("abcef"));
-
-        dict.addWord("abc", null, UNIGRAM_FREQ + 2, 0);
-        assertTrue(dict.isValidWord("abc"));
-        assertEquals(UNIGRAM_FREQ + 2, dict.getWordFrequency("abc"));
-
-        // Add existing word with lower frequency
-        dict.addWord("abc", null, UNIGRAM_FREQ, 0);
-        assertEquals(UNIGRAM_FREQ + 2, dict.getWordFrequency("abc"));
-
-        // Add existing word with higher frequency
-        dict.addWord("abc", null, UNIGRAM_FREQ + 3, 0);
-        assertEquals(UNIGRAM_FREQ + 3, dict.getWordFrequency("abc"));
-    }
-}
diff --git a/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java b/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java
index cadd0f8..e211d94 100644
--- a/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/FusionDictionaryTests.java
@@ -31,7 +31,7 @@
 public class FusionDictionaryTests extends AndroidTestCase {
     public void testFindWordInTree() {
         FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(new HashMap<String,String>(), false, false));
+                new FusionDictionary.DictionaryOptions(new HashMap<String,String>()));
 
         dict.add("abc", 10, null, false /* isNotAWord */);
         assertNull(FusionDictionary.findWordInTree(dict.mRootNodeArray, "aaa"));
diff --git a/tests/src/com/android/inputmethod/latin/InputLogicTests.java b/tests/src/com/android/inputmethod/latin/InputLogicTests.java
index 8ad8689..039f581 100644
--- a/tests/src/com/android/inputmethod/latin/InputLogicTests.java
+++ b/tests/src/com/android/inputmethod/latin/InputLogicTests.java
@@ -307,12 +307,14 @@
     }
 
     public void testResumeSuggestionOnBackspace() {
-        final String WORD_TO_TYPE = "and this ";
-        type(WORD_TO_TYPE);
+        final String STRING_TO_TYPE = "and this ";
+        final int typedLength = STRING_TO_TYPE.length();
+        type(STRING_TO_TYPE);
         assertEquals("resume suggestion on backspace", -1,
                 BaseInputConnection.getComposingSpanStart(mEditText.getText()));
         assertEquals("resume suggestion on backspace", -1,
                 BaseInputConnection.getComposingSpanEnd(mEditText.getText()));
+        mLatinIME.onUpdateSelection(0, 0, typedLength, typedLength, -1, -1);
         type(Constants.CODE_DELETE);
         assertEquals("resume suggestion on backspace", 4,
                 BaseInputConnection.getComposingSpanStart(mEditText.getText()));
@@ -348,4 +350,39 @@
         helperTestComposing("a'", true);
     }
     // TODO: Add some tests for non-BMP characters
+
+    public void testPredictionsAfterSpace() {
+        final String WORD_TO_TYPE = "Barack ";
+        type(WORD_TO_TYPE);
+        sleep(DELAY_TO_WAIT_FOR_PREDICTIONS);
+        runMessages();
+        // Test the first prediction is displayed
+        final SuggestedWords suggestedWords = mLatinIME.getSuggestedWords();
+        assertEquals("predictions after space", "Obama",
+                suggestedWords.size() > 0 ? suggestedWords.getWord(0) : null);
+    }
+
+    public void testPredictionsAfterManualPick() {
+        final String WORD_TO_TYPE = "Barack";
+        type(WORD_TO_TYPE);
+        // Choose the auto-correction, which is always in position 0. For "Barack", the
+        // auto-correction should be "Barack".
+        pickSuggestionManually(0, WORD_TO_TYPE);
+        runMessages();
+        sleep(DELAY_TO_WAIT_FOR_PREDICTIONS);
+        // Test the first prediction is displayed
+        final SuggestedWords suggestedWords = mLatinIME.getSuggestedWords();
+        assertEquals("predictions after manual pick", "Obama",
+                suggestedWords.size() > 0 ? suggestedWords.getWord(0) : null);
+    }
+
+    public void testNoPredictionsAfterPeriod() {
+        final String WORD_TO_TYPE = "Barack. ";
+        type(WORD_TO_TYPE);
+        sleep(DELAY_TO_WAIT_FOR_PREDICTIONS);
+        runMessages();
+        // Test the first prediction is displayed
+        final SuggestedWords suggestedWords = mLatinIME.getSuggestedWords();
+        assertEquals("no prediction after period", 0, suggestedWords.size());
+    }
 }
diff --git a/tests/src/com/android/inputmethod/latin/InputLogicTestsLanguageWithoutSpaces.java b/tests/src/com/android/inputmethod/latin/InputLogicTestsLanguageWithoutSpaces.java
index 0f0ebaf..89021b4 100644
--- a/tests/src/com/android/inputmethod/latin/InputLogicTestsLanguageWithoutSpaces.java
+++ b/tests/src/com/android/inputmethod/latin/InputLogicTestsLanguageWithoutSpaces.java
@@ -99,7 +99,8 @@
         assertEquals("predictions in lang without spaces", "Barack",
                 mEditText.getText().toString());
         // Test the first prediction is displayed
+        final SuggestedWords suggestedWords = mLatinIME.getSuggestedWords();
         assertEquals("predictions in lang without spaces", "Obama",
-                mLatinIME.getFirstSuggestedWord());
+                suggestedWords.size() > 0 ? suggestedWords.getWord(0) : null);
     }
 }
diff --git a/tests/src/com/android/inputmethod/latin/InputLogicTestsNonEnglish.java b/tests/src/com/android/inputmethod/latin/InputLogicTestsNonEnglish.java
index 2d736e3..a474c6a 100644
--- a/tests/src/com/android/inputmethod/latin/InputLogicTestsNonEnglish.java
+++ b/tests/src/com/android/inputmethod/latin/InputLogicTestsNonEnglish.java
@@ -84,8 +84,9 @@
             type(WORD_TO_TYPE);
             sleep(DELAY_TO_WAIT_FOR_UNDERLINE);
             runMessages();
+            final SuggestedWords suggestedWords = mLatinIME.getSuggestedWords();
             assertEquals("type word then type space yields predictions for French",
-                    EXPECTED_RESULT, mLatinIME.getFirstSuggestedWord());
+                    EXPECTED_RESULT, suggestedWords.size() > 0 ? suggestedWords.getWord(0) : null);
         } finally {
             setBooleanPreference(NEXT_WORD_PREDICTION_OPTION, previousNextWordPredictionOption,
                     defaultNextWordPredictionOption);
diff --git a/tests/src/com/android/inputmethod/latin/InputTestsBase.java b/tests/src/com/android/inputmethod/latin/InputTestsBase.java
index b9b52a6..cee73c9 100644
--- a/tests/src/com/android/inputmethod/latin/InputTestsBase.java
+++ b/tests/src/com/android/inputmethod/latin/InputTestsBase.java
@@ -30,6 +30,7 @@
 import android.view.ViewGroup;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputConnection;
+import android.view.inputmethod.InputMethodSubtype;
 import android.widget.EditText;
 import android.widget.FrameLayout;
 
@@ -37,15 +38,20 @@
 import com.android.inputmethod.keyboard.Keyboard;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.utils.LocaleUtils;
+import com.android.inputmethod.latin.utils.SubtypeLocaleUtils;
 
 import java.util.Locale;
 
 public class InputTestsBase extends ServiceTestCase<LatinIMEForTests> {
 
     private static final String PREF_DEBUG_MODE = "debug_mode";
+    private static final String PREF_AUTO_CORRECTION_THRESHOLD = "auto_correction_threshold";
+    // Default value for auto-correction threshold. This is the string representation of the
+    // index in the resources array of auto-correction threshold settings.
+    private static final String DEFAULT_AUTO_CORRECTION_THRESHOLD = "1";
 
-    // The message that sets the underline is posted with a 200 ms delay
-    protected static final int DELAY_TO_WAIT_FOR_UNDERLINE = 200;
+    // The message that sets the underline is posted with a 500 ms delay
+    protected static final int DELAY_TO_WAIT_FOR_UNDERLINE = 500;
     // The message that sets predictions is posted with a 200 ms delay
     protected static final int DELAY_TO_WAIT_FOR_PREDICTIONS = 200;
 
@@ -54,6 +60,8 @@
     protected MyEditText mEditText;
     protected View mInputView;
     protected InputConnection mInputConnection;
+    private boolean mPreviousDebugSetting;
+    private String mPreviousAutoCorrectSetting;
 
     // A helper class to ease span tests
     public static class SpanGetter {
@@ -135,7 +143,17 @@
         final boolean previousSetting = prefs.getBoolean(key, defaultValue);
         final SharedPreferences.Editor editor = prefs.edit();
         editor.putBoolean(key, value);
-        editor.commit();
+        editor.apply();
+        return previousSetting;
+    }
+
+    protected String setStringPreference(final String key, final String value,
+            final String defaultValue) {
+        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(mLatinIME);
+        final String previousSetting = prefs.getString(key, defaultValue);
+        final SharedPreferences.Editor editor = prefs.edit();
+        editor.putString(key, value);
+        editor.apply();
         return previousSetting;
     }
 
@@ -144,6 +162,13 @@
         return setBooleanPreference(PREF_DEBUG_MODE, value, false);
     }
 
+    protected EditorInfo enrichEditorInfo(final EditorInfo ei) {
+        // Some tests that inherit from us need to add some data in the EditorInfo (see
+        // AppWorkaroundsTests#enrichEditorInfo() for a concrete example of this). Since we
+        // control the EditorInfo, we supply a hook here for children to override.
+        return ei;
+    }
+
     @Override
     protected void setUp() throws Exception {
         super.setUp();
@@ -154,15 +179,17 @@
         mEditText.setEnabled(true);
         setupService();
         mLatinIME = getService();
-        final boolean previousDebugSetting = setDebugMode(true);
+        mPreviousDebugSetting = setDebugMode(true);
+        mPreviousAutoCorrectSetting = setStringPreference(PREF_AUTO_CORRECTION_THRESHOLD,
+                DEFAULT_AUTO_CORRECTION_THRESHOLD, DEFAULT_AUTO_CORRECTION_THRESHOLD);
         mLatinIME.onCreate();
-        setDebugMode(previousDebugSetting);
-        final EditorInfo ei = new EditorInfo();
+        EditorInfo ei = new EditorInfo();
         final InputConnection ic = mEditText.onCreateInputConnection(ei);
         final LayoutInflater inflater =
                 (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         final ViewGroup vg = new FrameLayout(getContext());
         mInputView = inflater.inflate(R.layout.input_view, vg);
+        ei = enrichEditorInfo(ei);
         mLatinIME.onCreateInputMethodInterface().startInput(ic, ei);
         mLatinIME.setInputView(mInputView);
         mLatinIME.onBindInput();
@@ -172,6 +199,14 @@
         changeLanguage("en_US");
     }
 
+    @Override
+    protected void tearDown() {
+        mLatinIME.mHandler.removeAllMessages();
+        setStringPreference(PREF_AUTO_CORRECTION_THRESHOLD, mPreviousAutoCorrectSetting,
+                DEFAULT_AUTO_CORRECTION_THRESHOLD);
+        setDebugMode(mPreviousDebugSetting);
+    }
+
     // We need to run the messages added to the handler from LatinIME. The only way to do
     // that is to call Looper#loop() on the right looper, so we're going to get the looper
     // object and call #loop() here. The messages in the handler actually run on the UI
@@ -244,7 +279,18 @@
 
     protected void changeLanguageWithoutWait(final String locale) {
         mEditText.mCurrentLocale = LocaleUtils.constructLocaleFromString(locale);
-        SubtypeSwitcher.getInstance().forceLocale(mEditText.mCurrentLocale);
+        final InputMethodSubtype subtype = new InputMethodSubtype(
+            R.string.subtype_no_language_qwerty, R.drawable.ic_ime_switcher_dark,
+            locale, "keyboard", "KeyboardLayoutSet="
+                    // TODO: this is forcing a QWERTY keyboard for all locales, which is wrong.
+                    // It's still better than using whatever keyboard is the current one, but we
+                    // should actually use the default keyboard for this locale.
+                    + SubtypeLocaleUtils.QWERTY
+                    + "," + Constants.Subtype.ExtraValue.ASCII_CAPABLE
+                    + "," + Constants.Subtype.ExtraValue.ENABLED_WHEN_DEFAULT_IS_NOT_ASCII_CAPABLE
+                    + "," + Constants.Subtype.ExtraValue.EMOJI_CAPABLE,
+                    false /* isAuxiliary */, false /* overridesImplicitlyEnabledSubtype */);
+        SubtypeSwitcher.getInstance().forceSubtype(subtype);
         mLatinIME.loadKeyboard();
         runMessages();
         mKeyboard = mLatinIME.mKeyboardSwitcher.getKeyboard();
diff --git a/tests/src/com/android/inputmethod/latin/LatinImeStressTests.java b/tests/src/com/android/inputmethod/latin/LatinImeStressTests.java
index 5e98cdf..db14b83 100644
--- a/tests/src/com/android/inputmethod/latin/LatinImeStressTests.java
+++ b/tests/src/com/android/inputmethod/latin/LatinImeStressTests.java
@@ -41,7 +41,7 @@
             }
         }
     }
-    public void testSwitchLanguagesAndInputRandamCodePoints() {
+    public void testSwitchLanguagesAndInputRandomCodePoints() {
         final String[] locales = {"en_US", "de", "el", "es", "fi", "it", "nl", "pt", "ru"};
         final int switchCount = 50;
         final int maxWordCountToTypeInEachIteration = 20;
diff --git a/tests/src/com/android/inputmethod/latin/PunctuationTests.java b/tests/src/com/android/inputmethod/latin/PunctuationTests.java
index 84ff6b30..d5c06e2 100644
--- a/tests/src/com/android/inputmethod/latin/PunctuationTests.java
+++ b/tests/src/com/android/inputmethod/latin/PunctuationTests.java
@@ -16,6 +16,7 @@
 
 package com.android.inputmethod.latin;
 
+import android.provider.Settings.Secure;
 import android.test.suitebuilder.annotation.LargeTest;
 
 import com.android.inputmethod.latin.R;
@@ -153,7 +154,9 @@
         final String WORD_TO_TYPE = "you'f ";
         final String EXPECTED_RESULT = "you'd ";
         type(WORD_TO_TYPE);
-        assertEquals("auto-correction with single quote inside",
+        assertEquals("auto-correction with single quote inside. ID = "
+                + Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID)
+                + " ; Suggestions = " + mLatinIME.getSuggestedWords(),
                 EXPECTED_RESULT, mEditText.getText().toString());
     }
 
@@ -161,7 +164,9 @@
         final String WORD_TO_TYPE = "'tgis' ";
         final String EXPECTED_RESULT = "'this' ";
         type(WORD_TO_TYPE);
-        assertEquals("auto-correction with single quotes around",
+        assertEquals("auto-correction with single quotes around. ID = "
+                + Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID)
+                + " ; Suggestions = " + mLatinIME.getSuggestedWords(),
                 EXPECTED_RESULT, mEditText.getText().toString());
     }
 }
diff --git a/tests/src/com/android/inputmethod/latin/RichInputConnectionAndTextRangeTests.java b/tests/src/com/android/inputmethod/latin/RichInputConnectionAndTextRangeTests.java
index c0dd993..6ad1250 100644
--- a/tests/src/com/android/inputmethod/latin/RichInputConnectionAndTextRangeTests.java
+++ b/tests/src/com/android/inputmethod/latin/RichInputConnectionAndTextRangeTests.java
@@ -16,6 +16,7 @@
 
 package com.android.inputmethod.latin;
 
+import com.android.inputmethod.latin.settings.SettingsValues;
 import com.android.inputmethod.latin.utils.TextRange;
 
 import android.inputmethodservice.InputMethodService;
@@ -39,7 +40,8 @@
 
     // The following is meant to be a reasonable default for
     // the "word_separators" resource.
-    private static final String sSeparators = ".,:;!?-";
+    private static final SettingsValues sSettings =
+            SettingsValues.makeDummySettingsValuesForTest(Locale.ENGLISH);
 
     @Override
     protected void setUp() throws Exception {
@@ -137,9 +139,9 @@
      */
     public void testGetPreviousWord() {
         // If one of the following cases breaks, the bigram suggestions won't work.
-        assertEquals(RichInputConnection.getNthPreviousWord("abc def", sSeparators, 2), "abc");
-        assertNull(RichInputConnection.getNthPreviousWord("abc", sSeparators, 2));
-        assertNull(RichInputConnection.getNthPreviousWord("abc. def", sSeparators, 2));
+        assertEquals(RichInputConnection.getNthPreviousWord("abc def", sSettings, 2), "abc");
+        assertNull(RichInputConnection.getNthPreviousWord("abc", sSettings, 2));
+        assertNull(RichInputConnection.getNthPreviousWord("abc. def", sSettings, 2));
 
         // The following tests reflect the current behavior of the function
         // RichInputConnection#getNthPreviousWord.
@@ -148,15 +150,15 @@
         // this function if needed - especially since it does not seem very
         // logical. These tests are just there to catch any unintentional
         // changes in the behavior of the RichInputConnection#getPreviousWord method.
-        assertEquals(RichInputConnection.getNthPreviousWord("abc def ", sSeparators, 2), "abc");
-        assertEquals(RichInputConnection.getNthPreviousWord("abc def.", sSeparators, 2), "abc");
-        assertEquals(RichInputConnection.getNthPreviousWord("abc def .", sSeparators, 2), "def");
-        assertNull(RichInputConnection.getNthPreviousWord("abc ", sSeparators, 2));
+        assertEquals(RichInputConnection.getNthPreviousWord("abc def ", sSettings, 2), "abc");
+        assertEquals(RichInputConnection.getNthPreviousWord("abc def.", sSettings, 2), "abc");
+        assertEquals(RichInputConnection.getNthPreviousWord("abc def .", sSettings, 2), "def");
+        assertNull(RichInputConnection.getNthPreviousWord("abc ", sSettings, 2));
 
-        assertEquals(RichInputConnection.getNthPreviousWord("abc def", sSeparators, 1), "def");
-        assertEquals(RichInputConnection.getNthPreviousWord("abc def ", sSeparators, 1), "def");
-        assertNull(RichInputConnection.getNthPreviousWord("abc def.", sSeparators, 1));
-        assertNull(RichInputConnection.getNthPreviousWord("abc def .", sSeparators, 1));
+        assertEquals(RichInputConnection.getNthPreviousWord("abc def", sSettings, 1), "def");
+        assertEquals(RichInputConnection.getNthPreviousWord("abc def ", sSettings, 1), "def");
+        assertNull(RichInputConnection.getNthPreviousWord("abc def.", sSettings, 1));
+        assertNull(RichInputConnection.getNthPreviousWord("abc def .", sSettings, 1));
     }
 
     /**
diff --git a/tests/src/com/android/inputmethod/latin/WordComposerTests.java b/tests/src/com/android/inputmethod/latin/WordComposerTests.java
index 1434c6b..1336c6d 100644
--- a/tests/src/com/android/inputmethod/latin/WordComposerTests.java
+++ b/tests/src/com/android/inputmethod/latin/WordComposerTests.java
@@ -26,8 +26,15 @@
 public class WordComposerTests extends AndroidTestCase {
     public void testMoveCursor() {
         final WordComposer wc = new WordComposer();
+        // BMP is the Basic Multilingual Plane, as defined by Unicode. This includes
+        // most characters for most scripts, including all Roman alphabet languages,
+        // CJK, Arabic, Hebrew. Notable exceptions include some emoji and some
+        // very rare Chinese ideograms. BMP characters can be encoded on 2 bytes
+        // in UTF-16, whereas those outside the BMP need 4 bytes.
+        // http://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane
         final String STR_WITHIN_BMP = "abcdef";
-        wc.setComposingWord(STR_WITHIN_BMP, null);
+        final String PREVWORD = "prevword";
+        wc.setComposingWord(STR_WITHIN_BMP, PREVWORD, null /* keyboard */);
         assertEquals(wc.size(),
                 STR_WITHIN_BMP.codePointCount(0, STR_WITHIN_BMP.length()));
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
@@ -43,13 +50,20 @@
         // Move the cursor to after the 'f'
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(1));
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
+        // Check the previous word is still there
+        assertEquals(PREVWORD, wc.getPreviousWordForSuggestion());
         // Move the cursor past the end of the word
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(1));
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(15));
+        // Do what LatinIME does when the cursor is moved outside of the word,
+        // and check the behavior is correct.
+        wc.reset();
+        assertNull(wc.getPreviousWordForSuggestion());
 
         // \uD861\uDED7 is 𨛗, a character outside the BMP
         final String STR_WITH_SUPPLEMENTARY_CHAR = "abcde\uD861\uDED7fgh";
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null /* previousWord */,
+                null /* keyboard */);
         assertEquals(wc.size(), STR_WITH_SUPPLEMENTARY_CHAR.codePointCount(0,
                         STR_WITH_SUPPLEMENTARY_CHAR.length()));
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
@@ -59,34 +73,46 @@
         assertTrue(wc.isCursorFrontOrMiddleOfComposingWord());
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(1));
         assertFalse(wc.isCursorFrontOrMiddleOfComposingWord());
+        assertNull(wc.getPreviousWordForSuggestion());
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, STR_WITHIN_BMP, null /* keyboard */);
         wc.setCursorPositionWithinWord(3);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(7));
+        assertEquals(STR_WITHIN_BMP, wc.getPreviousWordForSuggestion());
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, STR_WITH_SUPPLEMENTARY_CHAR,
+                null /* keyboard */);
         wc.setCursorPositionWithinWord(3);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(7));
+        assertEquals(STR_WITH_SUPPLEMENTARY_CHAR, wc.getPreviousWordForSuggestion());
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, STR_WITHIN_BMP, null /* keyboard */);
         wc.setCursorPositionWithinWord(3);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(-3));
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(-1));
+        assertEquals(STR_WITHIN_BMP, wc.getPreviousWordForSuggestion());
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null /* previousWord */,
+                null /* keyboard */);
         wc.setCursorPositionWithinWord(3);
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(-9));
+        assertNull(wc.getPreviousWordForSuggestion());
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, STR_WITH_SUPPLEMENTARY_CHAR,
+                null /* keyboard */);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(-10));
+        assertEquals(STR_WITH_SUPPLEMENTARY_CHAR, wc.getPreviousWordForSuggestion());
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null /* previousWord */,
+                null /* keyboard */);
         assertFalse(wc.moveCursorByAndReturnIfInsideComposingWord(-11));
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null /* previousWord */,
+                null /* keyboard */);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(0));
 
-        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null);
+        wc.setComposingWord(STR_WITH_SUPPLEMENTARY_CHAR, null /* previousWord */,
+                null /* keyboard */);
         wc.setCursorPositionWithinWord(2);
         assertTrue(wc.moveCursorByAndReturnIfInsideComposingWord(0));
     }
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
index 32c07e1..b5a71f0 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
@@ -26,15 +26,14 @@
 import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
 import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
-import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
+import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
 import com.android.inputmethod.latin.utils.ByteArrayDictBuffer;
 import com.android.inputmethod.latin.utils.CollectionUtils;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -52,18 +51,18 @@
 @LargeTest
 public class BinaryDictDecoderEncoderTests extends AndroidTestCase {
     private static final String TAG = BinaryDictDecoderEncoderTests.class.getSimpleName();
-    private static final int DEFAULT_MAX_UNIGRAMS = 100;
+    private static final int DEFAULT_MAX_UNIGRAMS = 300;
     private static final int DEFAULT_CODE_POINT_SET_SIZE = 50;
+    private static final int LARGE_CODE_POINT_SET_SIZE = 300;
     private static final int UNIGRAM_FREQ = 10;
     private static final int BIGRAM_FREQ = 50;
     private static final int TOLERANCE_OF_BIGRAM_FREQ = 5;
     private static final int NUM_OF_NODES_HAVING_SHORTCUTS = 50;
     private static final int NUM_OF_SHORTCUTS = 5;
 
-    private static final int USE_BYTE_ARRAY = 1;
-    private static final int USE_BYTE_BUFFER = 2;
-
     private static final ArrayList<String> sWords = CollectionUtils.newArrayList();
+    private static final ArrayList<String> sWordsWithVariousCodePoints =
+            CollectionUtils.newArrayList();
     private static final SparseArray<List<Integer>> sEmptyBigrams =
             CollectionUtils.newSparseArray();
     private static final SparseArray<List<Integer>> sStarBigrams = CollectionUtils.newSparseArray();
@@ -71,21 +70,6 @@
             CollectionUtils.newSparseArray();
     private static final HashMap<String, List<String>> sShortcuts = CollectionUtils.newHashMap();
 
-    private static final FormatSpec.FormatOptions VERSION2 = new FormatSpec.FormatOptions(2);
-    private static final FormatSpec.FormatOptions VERSION3_WITHOUT_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(3, false /* supportsDynamicUpdate */);
-    private static final FormatSpec.FormatOptions VERSION3_WITH_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(3, true /* supportsDynamicUpdate */);
-    private static final FormatSpec.FormatOptions VERSION4_WITHOUT_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(4, false /* supportsDynamicUpdate */);
-    private static final FormatSpec.FormatOptions VERSION4_WITH_DYNAMIC_UPDATE =
-            new FormatSpec.FormatOptions(4, true /* supportsDynamicUpdate */);
-    private static final FormatSpec.FormatOptions VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP =
-            new FormatSpec.FormatOptions(4, true /* supportsDynamicUpdate */,
-                    true /* hasTimestamp */);
-
-    private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
-
     public BinaryDictDecoderEncoderTests() {
         this(System.currentTimeMillis(), DEFAULT_MAX_UNIGRAMS);
     }
@@ -95,9 +79,8 @@
         Log.e(TAG, "Testing dictionary: seed is " + seed);
         final Random random = new Random(seed);
         sWords.clear();
-        final int[] codePointSet = CodePointUtils.generateCodePointSet(DEFAULT_CODE_POINT_SET_SIZE,
-                random);
-        generateWords(maxUnigrams, random, codePointSet);
+        sWordsWithVariousCodePoints.clear();
+        generateWords(maxUnigrams, random);
 
         for (int i = 0; i < sWords.size(); ++i) {
             sChainBigrams.put(i, new ArrayList<Integer>());
@@ -124,23 +107,22 @@
         }
     }
 
-    private DictEncoder getDictEncoder(final File file, final FormatOptions formatOptions) {
-        if (formatOptions.mVersion == FormatSpec.VERSION4) {
-            return new Ver4DictEncoder(getContext().getCacheDir());
-        } else if (formatOptions.mVersion == 3 || formatOptions.mVersion == 2) {
-            return new Ver3DictEncoder(file);
-        } else {
-            throw new RuntimeException("The format option has a wrong version : "
-                    + formatOptions.mVersion);
-        }
-    }
-
-    private void generateWords(final int number, final Random random, final int[] codePointSet) {
+    private void generateWords(final int number, final Random random) {
+        final int[] codePointSet = CodePointUtils.generateCodePointSet(DEFAULT_CODE_POINT_SET_SIZE,
+                random);
         final Set<String> wordSet = CollectionUtils.newHashSet();
         while (wordSet.size() < number) {
             wordSet.add(CodePointUtils.generateWord(random, codePointSet));
         }
         sWords.addAll(wordSet);
+
+        final int[] largeCodePointSet = CodePointUtils.generateCodePointSet(
+                LARGE_CODE_POINT_SET_SIZE, random);
+        wordSet.clear();
+        while (wordSet.size() < number) {
+            wordSet.add(CodePointUtils.generateWord(random, largeCodePointSet));
+        }
+        sWordsWithVariousCodePoints.addAll(wordSet);
     }
 
     /**
@@ -186,7 +168,7 @@
         long now = -1, diff = -1;
 
         try {
-            final DictEncoder dictEncoder = getDictEncoder(file, formatOptions);
+            final DictEncoder dictEncoder = BinaryDictUtils.getDictEncoder(file, formatOptions);
 
             now = System.currentTimeMillis();
             // If you need to dump the dict to a textual file, uncomment the line below and the
@@ -241,54 +223,20 @@
     private String outputOptions(final int bufferType,
             final FormatSpec.FormatOptions formatOptions) {
         String result = " : buffer type = "
-                + ((bufferType == USE_BYTE_BUFFER) ? "byte buffer" : "byte array");
-        result += " : version = " + formatOptions.mVersion;
-        return result + ", supportsDynamicUpdate = " + formatOptions.mSupportsDynamicUpdate;
+                + ((bufferType == BinaryDictUtils.USE_BYTE_BUFFER) ? "byte buffer" : "byte array");
+        return result + " : version = " + formatOptions.mVersion;
     }
 
-    private DictionaryOptions getDictionaryOptions(final String id, final String version) {
-        final DictionaryOptions options = new DictionaryOptions(new HashMap<String, String>(),
-                false, false);
-        options.mAttributes.put("version", version);
-        options.mAttributes.put("dictionary", id);
-        return options;
-    }
-
-    private File setUpDictionaryFile(final String name, final String version) {
-        File file = null;
-        try {
-            file = new File(getContext().getCacheDir(), name + "." + version
-                    + TEST_DICT_FILE_EXTENSION);
-            file.createNewFile();
-        } catch (IOException e) {
-            // do nothing
-        }
-        assertTrue("Failed to create the dictionary file.", file.exists());
-        return file;
-    }
-
-    private DictDecoder getDictDecoder(final File file, final int bufferType,
-            final FormatOptions formatOptions, final DictionaryOptions dictOptions) {
-        if (formatOptions.mVersion == FormatSpec.VERSION4) {
-            final FileHeader header = new FileHeader(0, dictOptions, formatOptions);
-            return FormatSpec.getDictDecoder(new File(getContext().getCacheDir(),
-                    header.getId() + "." + header.getVersion()), bufferType);
-        } else {
-            return FormatSpec.getDictDecoder(file, bufferType);
-        }
-    }
     // Tests for readDictionaryBinary and writeDictionaryBinary
 
     private long timeReadingAndCheckDict(final File file, final List<String> words,
             final SparseArray<List<Integer>> bigrams,
-            final HashMap<String, List<String>> shortcutMap, final int bufferType,
-            final FormatOptions formatOptions, final DictionaryOptions dictOptions) {
+            final HashMap<String, List<String>> shortcutMap, final int bufferType) {
         long now, diff = -1;
 
         FusionDictionary dict = null;
         try {
-            final DictDecoder dictDecoder = getDictDecoder(file, bufferType, formatOptions,
-                    dictOptions);
+            final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file, bufferType);
             now = System.currentTimeMillis();
             dict = dictDecoder.readDictionaryBinary(null, false /* deleteDictIfBroken */);
             diff  = System.currentTimeMillis() - now;
@@ -310,17 +258,17 @@
 
         final String dictName = "runReadAndWrite";
         final String dictVersion = Long.toString(System.currentTimeMillis());
-        final File file = setUpDictionaryFile(dictName, dictVersion);
+        final File file = BinaryDictUtils.getDictFile(dictName, dictVersion, formatOptions,
+                getContext().getCacheDir());
 
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                getDictionaryOptions(dictName, dictVersion));
+                BinaryDictUtils.makeDictionaryOptions(dictName, dictVersion));
         addUnigrams(words.size(), dict, words, shortcuts);
         addBigrams(dict, words, bigrams);
         checkDictionary(dict, words, bigrams, shortcuts);
 
         final long write = timeWritingDictToFile(file, dict, formatOptions);
-        final long read = timeReadingAndCheckDict(file, words, bigrams, shortcuts, bufferType,
-                formatOptions, dict.mOptions);
+        final long read = timeReadingAndCheckDict(file, words, bigrams, shortcuts, bufferType);
 
         return "PROF: read=" + read + "ms, write=" + write + "ms :" + message
                 + " : " + outputOptions(bufferType, formatOptions);
@@ -340,6 +288,9 @@
                 "chain with shortcuts"));
         results.add(runReadAndWrite(sWords, sStarBigrams, sShortcuts, bufferType, formatOptions,
                 "star with shortcuts"));
+        results.add(runReadAndWrite(sWordsWithVariousCodePoints, sEmptyBigrams,
+                null /* shortcuts */, bufferType, formatOptions,
+                "unigram with various code points"));
     }
 
     // Unit test for CharEncoding.readString and CharEncoding.writeString.
@@ -349,8 +300,7 @@
         final byte[] buffer = new byte[50 * 3];
         final DictBuffer dictBuffer = new ByteArrayDictBuffer(buffer);
         for (final String word : sWords) {
-            Log.d("testReadAndWriteString", "write : " + word);
-            Arrays.fill(buffer, (byte)0);
+            Arrays.fill(buffer, (byte) 0);
             CharEncoding.writeString(buffer, 0, word);
             dictBuffer.position(0);
             final String str = CharEncoding.readString(dictBuffer);
@@ -361,12 +311,12 @@
     public void testReadAndWriteWithByteBuffer() {
         final List<String> results = CollectionUtils.newArrayList();
 
-        runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION2);
-        runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION3_WITHOUT_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_BUFFER, VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION2_OPTIONS);
+        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -376,12 +326,12 @@
     public void testReadAndWriteWithByteArray() {
         final List<String> results = CollectionUtils.newArrayList();
 
-        runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION2);
-        runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION3_WITHOUT_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadAndWriteTests(results, USE_BYTE_ARRAY, VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION2_OPTIONS);
+        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runReadAndWriteTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -405,25 +355,25 @@
         }
 
         // check bigrams
-        final HashMap<String, List<String>> expBigrams = new HashMap<String, List<String>>();
+        final HashMap<String, Set<String>> expBigrams = new HashMap<String, Set<String>>();
         for (int i = 0; i < expectedBigrams.size(); ++i) {
             final String word1 = expectedWords.get(expectedBigrams.keyAt(i));
             for (int w2 : expectedBigrams.valueAt(i)) {
                 if (expBigrams.get(word1) == null) {
-                    expBigrams.put(word1, new ArrayList<String>());
+                    expBigrams.put(word1, new HashSet<String>());
                 }
                 expBigrams.get(word1).add(expectedWords.get(w2));
             }
         }
 
-        final HashMap<String, List<String>> actBigrams = new HashMap<String, List<String>>();
+        final HashMap<String, Set<String>> actBigrams = new HashMap<String, Set<String>>();
         for (Entry<Integer, ArrayList<PendingAttribute>> entry : resultBigrams.entrySet()) {
             final String word1 = resultWords.get(entry.getKey());
             final int unigramFreq = resultFrequencies.get(entry.getKey());
             for (PendingAttribute attr : entry.getValue()) {
                 final String word2 = resultWords.get(attr.mAddress);
                 if (actBigrams.get(word1) == null) {
-                    actBigrams.put(word1, new ArrayList<String>());
+                    actBigrams.put(word1, new HashSet<String>());
                 }
                 actBigrams.get(word1).add(word2);
 
@@ -432,15 +382,11 @@
                 assertTrue(Math.abs(bigramFreq - BIGRAM_FREQ) < TOLERANCE_OF_BIGRAM_FREQ);
             }
         }
-
         assertEquals(actBigrams, expBigrams);
     }
 
     private long timeAndCheckReadUnigramsAndBigramsBinary(final File file, final List<String> words,
-            final SparseArray<List<Integer>> bigrams, final int bufferType,
-            final FormatOptions formatOptions, final DictionaryOptions dictOptions) {
-        FileInputStream inStream = null;
-
+            final SparseArray<List<Integer>> bigrams, final int bufferType) {
         final TreeMap<Integer, String> resultWords = CollectionUtils.newTreeMap();
         final TreeMap<Integer, ArrayList<PendingAttribute>> resultBigrams =
                 CollectionUtils.newTreeMap();
@@ -448,8 +394,7 @@
 
         long now = -1, diff = -1;
         try {
-            final DictDecoder dictDecoder = getDictDecoder(file, bufferType, formatOptions,
-                    dictOptions);
+            final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file, bufferType);
             now = System.currentTimeMillis();
             dictDecoder.readUnigramsAndBigramsBinary(resultWords, resultFreqs, resultBigrams);
             diff = System.currentTimeMillis() - now;
@@ -457,14 +402,6 @@
             Log.e(TAG, "IOException", e);
         } catch (UnsupportedFormatException e) {
             Log.e(TAG, "UnsupportedFormatException", e);
-        } finally {
-            if (inStream != null) {
-                try {
-                    inStream.close();
-                } catch (IOException e) {
-                    // do nothing
-                }
-            }
         }
 
         checkWordMap(words, bigrams, resultWords, resultFreqs, resultBigrams);
@@ -476,20 +413,20 @@
             final FormatSpec.FormatOptions formatOptions, final String message) {
         final String dictName = "runReadUnigrams";
         final String dictVersion = Long.toString(System.currentTimeMillis());
-        final File file = setUpDictionaryFile(dictName, dictVersion);
+        final File file = BinaryDictUtils.getDictFile(dictName, dictVersion, formatOptions,
+                getContext().getCacheDir());
 
         // making the dictionary from lists of words.
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                getDictionaryOptions(dictName, dictVersion));
+                BinaryDictUtils.makeDictionaryOptions(dictName, dictVersion));
         addUnigrams(words.size(), dict, words, null /* shortcutMap */);
         addBigrams(dict, words, bigrams);
 
         timeWritingDictToFile(file, dict, formatOptions);
 
-        long wordMap = timeAndCheckReadUnigramsAndBigramsBinary(file, words, bigrams, bufferType,
-                formatOptions, dict.mOptions);
+        long wordMap = timeAndCheckReadUnigramsAndBigramsBinary(file, words, bigrams, bufferType);
         long fullReading = timeReadingAndCheckDict(file, words, bigrams, null /* shortcutMap */,
-                bufferType, formatOptions, dict.mOptions);
+                bufferType);
 
         return "readDictionaryBinary=" + fullReading + ", readUnigramsAndBigramsBinary=" + wordMap
                 + " : " + message + " : " + outputOptions(bufferType, formatOptions);
@@ -508,13 +445,12 @@
     public void testReadUnigramsAndBigramsBinaryWithByteBuffer() {
         final ArrayList<String> results = CollectionUtils.newArrayList();
 
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION2);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION3_WITHOUT_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER, VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_BUFFER,
-                VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION2_OPTIONS);
+        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -524,13 +460,12 @@
     public void testReadUnigramsAndBigramsBinaryWithByteArray() {
         final ArrayList<String> results = CollectionUtils.newArrayList();
 
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION2);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION3_WITHOUT_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION3_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY, VERSION4_WITH_DYNAMIC_UPDATE);
-        runReadUnigramsAndBigramsTests(results, USE_BYTE_ARRAY,
-                VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION2_OPTIONS);
+        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runReadUnigramsAndBigramsTests(results, BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
@@ -550,7 +485,7 @@
             return null;
         }
         if (fileHeader == null) return null;
-        return BinaryDictDecoderUtils.getWordAtPosition(dictDecoder, fileHeader.mHeaderSize,
+        return BinaryDictDecoderUtils.getWordAtPosition(dictDecoder, fileHeader.mBodyOffset,
                 address, fileHeader.mFormatOptions).mWord;
     }
 
@@ -578,20 +513,21 @@
             final FormatOptions formatOptions, final String message) {
         final String dictName = "testGetTerminalPosition";
         final String dictVersion = Long.toString(System.currentTimeMillis());
-        final File file = setUpDictionaryFile(dictName, dictVersion);
+        final File file = BinaryDictUtils.getDictFile(dictName, dictVersion, formatOptions,
+                getContext().getCacheDir());
 
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                getDictionaryOptions(dictName, dictVersion));
+                BinaryDictUtils.makeDictionaryOptions(dictName, dictVersion));
         addUnigrams(sWords.size(), dict, sWords, null /* shortcutMap */);
         addBigrams(dict, words, bigrams);
         timeWritingDictToFile(file, dict, formatOptions);
 
-        final DictDecoder dictDecoder = getDictDecoder(file, DictDecoder.USE_BYTEARRAY,
-                formatOptions, dict.mOptions);
+        final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file, DictDecoder.USE_BYTEARRAY);
         try {
             dictDecoder.openDictBuffer();
         } catch (IOException e) {
-            // ignore
+            Log.e(TAG, "IOException while opening the buffer", e);
+        } catch (UnsupportedFormatException e) {
             Log.e(TAG, "IOException while opening the buffer", e);
         }
         assertTrue("Can't get the buffer", dictDecoder.isDictBufferOpen());
@@ -638,65 +574,22 @@
     public void testGetTerminalPosition() {
         final ArrayList<String> results = CollectionUtils.newArrayList();
 
-        runGetTerminalPositionTests(USE_BYTE_ARRAY, VERSION2);
-        runGetTerminalPositionTests(USE_BYTE_ARRAY, VERSION3_WITHOUT_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_ARRAY, VERSION3_WITH_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_ARRAY, VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_ARRAY, VERSION4_WITH_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_ARRAY, VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION2_OPTIONS);
+        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_ARRAY,
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
-        runGetTerminalPositionTests(USE_BYTE_BUFFER, VERSION2);
-        runGetTerminalPositionTests(USE_BYTE_BUFFER, VERSION3_WITHOUT_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_BUFFER, VERSION3_WITH_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_BUFFER, VERSION4_WITHOUT_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_BUFFER, VERSION4_WITH_DYNAMIC_UPDATE);
-        runGetTerminalPositionTests(USE_BYTE_BUFFER, VERSION4_WITH_DYNAMIC_UPDATE_AND_TIMESTAMP);
+        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION2_OPTIONS);
+        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION4_OPTIONS_WITHOUT_TIMESTAMP);
+        runGetTerminalPositionTests(BinaryDictUtils.USE_BYTE_BUFFER,
+                BinaryDictUtils.VERSION4_OPTIONS_WITH_TIMESTAMP);
 
         for (final String result : results) {
             Log.d(TAG, result);
         }
     }
-
-    private void runTestDeleteWord(final FormatOptions formatOptions) {
-        final String dictName = "testDeleteWord";
-        final String dictVersion = Long.toString(System.currentTimeMillis());
-        final File file = setUpDictionaryFile(dictName, dictVersion);
-
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(
-                        new HashMap<String, String>(), false, false));
-        addUnigrams(sWords.size(), dict, sWords, null /* shortcutMap */);
-        timeWritingDictToFile(file, dict, formatOptions);
-
-        final DictUpdater dictUpdater;
-        if (formatOptions.mVersion == 3) {
-            dictUpdater = new Ver3DictUpdater(file, DictDecoder.USE_WRITABLE_BYTEBUFFER);
-        } else if (formatOptions.mVersion == 4) {
-            dictUpdater = new Ver4DictUpdater(file, DictDecoder.USE_WRITABLE_BYTEBUFFER);
-        } else {
-            throw new RuntimeException("DictUpdater for version " + formatOptions.mVersion
-                    + " doesn't exist.");
-        }
-
-        try {
-            MoreAsserts.assertNotEqual(FormatSpec.NOT_VALID_WORD,
-                    dictUpdater.getTerminalPosition(sWords.get(0)));
-            dictUpdater.deleteWord(sWords.get(0));
-            assertEquals(FormatSpec.NOT_VALID_WORD,
-                    dictUpdater.getTerminalPosition(sWords.get(0)));
-
-            MoreAsserts.assertNotEqual(FormatSpec.NOT_VALID_WORD,
-                    dictUpdater.getTerminalPosition(sWords.get(5)));
-            dictUpdater.deleteWord(sWords.get(5));
-            assertEquals(FormatSpec.NOT_VALID_WORD,
-                    dictUpdater.getTerminalPosition(sWords.get(5)));
-        } catch (IOException e) {
-        } catch (UnsupportedFormatException e) {
-        }
-    }
-
-    public void testDeleteWord() {
-        runTestDeleteWord(VERSION3_WITH_DYNAMIC_UPDATE);
-        runTestDeleteWord(VERSION4_WITH_DYNAMIC_UPDATE);
-    }
 }
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java
deleted file mode 100644
index afe5adb..0000000
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtilsTests.java
+++ /dev/null
@@ -1,389 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.makedict;
-
-import android.test.AndroidTestCase;
-import android.test.MoreAsserts;
-import android.test.suitebuilder.annotation.LargeTest;
-import android.util.Log;
-
-import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
-import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
-import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
-import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
-import com.android.inputmethod.latin.utils.CollectionUtils;
-
-import java.io.File;
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.Random;
-
-@LargeTest
-public class BinaryDictIOUtilsTests extends AndroidTestCase {
-    private static final String TAG = BinaryDictIOUtilsTests.class.getSimpleName();
-    private static final FormatSpec.FormatOptions FORMAT_OPTIONS =
-            new FormatSpec.FormatOptions(3, true);
-
-    private static final ArrayList<String> sWords = CollectionUtils.newArrayList();
-    public static final int DEFAULT_MAX_UNIGRAMS = 1500;
-    private final int mMaxUnigrams;
-
-    private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
-
-    private static final int VERSION3 = 3;
-    private static final int VERSION4 = 4;
-
-    private static final String[] CHARACTERS = {
-        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
-        "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
-        "\u00FC" /* ü */, "\u00E2" /* â */, "\u00F1" /* ñ */, // accented characters
-        "\u4E9C" /* 亜 */, "\u4F0A" /* 伊 */, "\u5B87" /* 宇 */, // kanji
-        "\uD841\uDE28" /* 𠘨 */, "\uD840\uDC0B" /* 𠀋 */, "\uD861\uDED7" /* 𨛗 */ // surrogate pair
-    };
-
-    public BinaryDictIOUtilsTests() {
-        // 1500 is the default max unigrams
-        this(System.currentTimeMillis(), DEFAULT_MAX_UNIGRAMS);
-    }
-
-    public BinaryDictIOUtilsTests(final long seed, final int maxUnigrams) {
-        super();
-        Log.d(TAG, "Seed for test is " + seed + ", maxUnigrams is " + maxUnigrams);
-        mMaxUnigrams = maxUnigrams;
-        final Random random = new Random(seed);
-        sWords.clear();
-        for (int i = 0; i < maxUnigrams; ++i) {
-            sWords.add(generateWord(random.nextInt()));
-        }
-    }
-
-    // Utilities for test
-    private String generateWord(final int value) {
-        final int lengthOfChars = CHARACTERS.length;
-        StringBuilder builder = new StringBuilder("");
-        long lvalue = Math.abs((long)value);
-        while (lvalue > 0) {
-            builder.append(CHARACTERS[(int)(lvalue % lengthOfChars)]);
-            lvalue /= lengthOfChars;
-        }
-        if (builder.toString().equals("")) return "a";
-        return builder.toString();
-    }
-
-    private static void printPtNode(final PtNodeInfo info) {
-        Log.d(TAG, "    PtNode at " + info.mOriginalAddress);
-        Log.d(TAG, "        flags = " + info.mFlags);
-        Log.d(TAG, "        parentAddress = " + info.mParentAddress);
-        Log.d(TAG, "        characters = " + new String(info.mCharacters, 0,
-                info.mCharacters.length));
-        if (info.mFrequency != -1) Log.d(TAG, "        frequency = " + info.mFrequency);
-        if (info.mChildrenAddress == FormatSpec.NO_CHILDREN_ADDRESS) {
-            Log.d(TAG, "        children address = no children address");
-        } else {
-            Log.d(TAG, "        children address = " + info.mChildrenAddress);
-        }
-        if (info.mShortcutTargets != null) {
-            for (final WeightedString ws : info.mShortcutTargets) {
-                Log.d(TAG, "        shortcuts = " + ws.mWord);
-            }
-        }
-        if (info.mBigrams != null) {
-            for (final PendingAttribute attr : info.mBigrams) {
-                Log.d(TAG, "        bigram = " + attr.mAddress);
-            }
-        }
-        Log.d(TAG, "    end address = " + info.mEndAddress);
-    }
-
-    private static void printNode(final Ver3DictDecoder dictDecoder,
-            final FormatSpec.FormatOptions formatOptions) {
-        final DictBuffer dictBuffer = dictDecoder.getDictBuffer();
-        Log.d(TAG, "Node at " + dictBuffer.position());
-        final int count = BinaryDictDecoderUtils.readPtNodeCount(dictBuffer);
-        Log.d(TAG, "    ptNodeCount = " + count);
-        for (int i = 0; i < count; ++i) {
-            final PtNodeInfo currentInfo = dictDecoder.readPtNode(dictBuffer.position(),
-                    formatOptions);
-            printPtNode(currentInfo);
-        }
-        if (formatOptions.mSupportsDynamicUpdate) {
-            final int forwardLinkAddress = dictBuffer.readUnsignedInt24();
-            Log.d(TAG, "    forwardLinkAddress = " + forwardLinkAddress);
-        }
-    }
-
-    @SuppressWarnings("unused")
-    private static void printBinaryFile(final Ver3DictDecoder dictDecoder)
-            throws IOException, UnsupportedFormatException {
-        final FileHeader fileHeader = dictDecoder.readHeader();
-        final DictBuffer dictBuffer = dictDecoder.getDictBuffer();
-        while (dictBuffer.position() < dictBuffer.limit()) {
-            printNode(dictDecoder, fileHeader.mFormatOptions);
-        }
-    }
-
-    private int getWordPosition(final File file, final String word) {
-        int position = FormatSpec.NOT_VALID_WORD;
-
-        try {
-            final Ver3DictDecoder dictDecoder = new Ver3DictDecoder(file,
-                    DictDecoder.USE_READONLY_BYTEBUFFER);
-            position = dictDecoder.getTerminalPosition(word);
-        } catch (IOException e) {
-        } catch (UnsupportedFormatException e) {
-        }
-        return position;
-    }
-
-    /**
-     * Find a word using the DictDecoder.
-     *
-     * @param dictDecoder the dict decoder
-     * @param word the word searched
-     * @return the found ptNodeInfo
-     * @throws IOException
-     * @throws UnsupportedFormatException
-     */
-    private static PtNodeInfo findWordByBinaryDictReader(final DictDecoder dictDecoder,
-            final String word) throws IOException, UnsupportedFormatException {
-        int position = dictDecoder.getTerminalPosition(word);
-        if (position != FormatSpec.NOT_VALID_WORD) {
-            dictDecoder.setPosition(0);
-            final FileHeader header = dictDecoder.readHeader();
-            dictDecoder.setPosition(position);
-            return dictDecoder.readPtNode(position, header.mFormatOptions);
-        }
-        return null;
-    }
-
-    private PtNodeInfo findWordFromFile(final File file, final String word) {
-        final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file);
-        PtNodeInfo info = null;
-        try {
-            dictDecoder.openDictBuffer();
-            info = findWordByBinaryDictReader(dictDecoder, word);
-        } catch (IOException e) {
-        } catch (UnsupportedFormatException e) {
-        }
-        return info;
-    }
-
-    // return amount of time to insert a word
-    private long insertAndCheckWord(final File file, final String word, final int frequency,
-            final boolean exist, final ArrayList<WeightedString> bigrams,
-            final ArrayList<WeightedString> shortcuts, final int formatVersion) {
-        long amountOfTime = -1;
-        try {
-            final DictUpdater dictUpdater;
-            if (formatVersion == VERSION3) {
-                dictUpdater = new Ver3DictUpdater(file, DictDecoder.USE_WRITABLE_BYTEBUFFER);
-            } else {
-                throw new RuntimeException("DictUpdater for version " + formatVersion + " doesn't"
-                        + " exist.");
-            }
-
-            if (!exist) {
-                assertEquals(FormatSpec.NOT_VALID_WORD, getWordPosition(file, word));
-            }
-            final long now = System.nanoTime();
-            dictUpdater.insertWord(word, frequency, bigrams, shortcuts, false, false);
-            amountOfTime = System.nanoTime() - now;
-            MoreAsserts.assertNotEqual(FormatSpec.NOT_VALID_WORD, getWordPosition(file, word));
-        } catch (IOException e) {
-            Log.e(TAG, "Raised an IOException while inserting a word", e);
-        } catch (UnsupportedFormatException e) {
-            Log.e(TAG, "Raised an UnsupportedFormatException error while inserting a word", e);
-        }
-        return amountOfTime;
-    }
-
-    private void deleteWord(final File file, final String word, final int formatVersion) {
-        try {
-            final DictUpdater dictUpdater;
-            if (formatVersion == VERSION3) {
-                dictUpdater = new Ver3DictUpdater(file, DictDecoder.USE_WRITABLE_BYTEBUFFER);
-            } else {
-                throw new RuntimeException("DictUpdater for version " + formatVersion + " doesn't"
-                        + " exist.");
-            }
-            dictUpdater.deleteWord(word);
-        } catch (IOException e) {
-        } catch (UnsupportedFormatException e) {
-        }
-    }
-
-    private void checkReverseLookup(final File file, final String word, final int position) {
-
-        try {
-            final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file);
-            final FileHeader fileHeader = dictDecoder.readHeader();
-            assertEquals(word,
-                    BinaryDictDecoderUtils.getWordAtPosition(dictDecoder, fileHeader.mHeaderSize,
-                            position, fileHeader.mFormatOptions).mWord);
-        } catch (IOException e) {
-            Log.e(TAG, "Raised an IOException while looking up a word", e);
-        } catch (UnsupportedFormatException e) {
-            Log.e(TAG, "Raised an UnsupportedFormatException error while looking up a word", e);
-        }
-    }
-
-    private void runTestInsertWord(final int formatVersion) {
-        File file = null;
-        try {
-            file = File.createTempFile("testInsertWord", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-            fail("IOException while creating temporary file: " + e);
-        }
-
-        // set an initial dictionary.
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(new HashMap<String,String>(), false, false));
-        dict.add("abcd", 10, null, false);
-
-        try {
-            final DictEncoder dictEncoder = new Ver3DictEncoder(file);
-            dictEncoder.writeDictionary(dict, FORMAT_OPTIONS);
-        } catch (IOException e) {
-            fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
-        }
-
-        MoreAsserts.assertNotEqual(FormatSpec.NOT_VALID_WORD, getWordPosition(file, "abcd"));
-        insertAndCheckWord(file, "abcde", 10, false, null, null, formatVersion);
-
-        insertAndCheckWord(file, "abcdefghijklmn", 10, false, null, null, formatVersion);
-        checkReverseLookup(file, "abcdefghijklmn", getWordPosition(file, "abcdefghijklmn"));
-
-        insertAndCheckWord(file, "abcdabcd", 10, false, null, null, formatVersion);
-        checkReverseLookup(file, "abcdabcd", getWordPosition(file, "abcdabcd"));
-
-        // update the existing word.
-        insertAndCheckWord(file, "abcdabcd", 15, true, null, null, formatVersion);
-
-        // split 1
-        insertAndCheckWord(file, "ab", 20, false, null, null, formatVersion);
-
-        // split 2
-        insertAndCheckWord(file, "ami", 30, false, null, null, formatVersion);
-
-        deleteWord(file, "ami", formatVersion);
-        assertEquals(FormatSpec.NOT_VALID_WORD, getWordPosition(file, "ami"));
-
-        insertAndCheckWord(file, "abcdabfg", 30, false, null, null, formatVersion);
-
-        deleteWord(file, "abcd", formatVersion);
-        assertEquals(FormatSpec.NOT_VALID_WORD, getWordPosition(file, "abcd"));
-    }
-
-    public void testInsertWord() {
-        runTestInsertWord(VERSION3);
-    }
-
-    private void runTestInsertWordWithBigrams(final int formatVersion) {
-        File file = null;
-        try {
-            file = File.createTempFile("testInsertWordWithBigrams", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-            fail("IOException while creating temporary file: " + e);
-        }
-
-        // set an initial dictionary.
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(new HashMap<String,String>(), false, false));
-        dict.add("abcd", 10, null, false);
-        dict.add("efgh", 15, null, false);
-
-        try {
-            final DictEncoder dictEncoder = new Ver3DictEncoder(file); 
-            dictEncoder.writeDictionary(dict, FORMAT_OPTIONS);
-        } catch (IOException e) {
-            fail("IOException while writing an initial dictionary : " + e);
-        } catch (UnsupportedFormatException e) {
-            fail("UnsupportedFormatException while writing an initial dictionary : " + e);
-        }
-
-        final ArrayList<WeightedString> banana = new ArrayList<WeightedString>();
-        banana.add(new WeightedString("banana", 10));
-
-        insertAndCheckWord(file, "banana", 0, false, null, null, formatVersion);
-        insertAndCheckWord(file, "recursive", 60, true, banana, null, formatVersion);
-
-        final PtNodeInfo info = findWordFromFile(file, "recursive");
-        int bananaPos = getWordPosition(file, "banana");
-        assertNotNull(info.mBigrams);
-        assertEquals(info.mBigrams.size(), 1);
-        assertEquals(info.mBigrams.get(0).mAddress, bananaPos);
-    }
-
-    public void testInsertWordWithBigrams() {
-        runTestInsertWordWithBigrams(VERSION3);
-    }
-
-    private void runTestRandomWords(final int formatVersion) {
-        File file = null;
-        try {
-            file = File.createTempFile("testRandomWord", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-        }
-        assertNotNull(file);
-
-        // set an initial dictionary.
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(new HashMap<String, String>(), false,
-                        false));
-        dict.add("initial", 10, null, false);
-
-        try {
-            final DictEncoder dictEncoder = new Ver3DictEncoder(file);
-            dictEncoder.writeDictionary(dict, FORMAT_OPTIONS);
-        } catch (IOException e) {
-            assertTrue(false);
-        } catch (UnsupportedFormatException e) {
-            assertTrue(false);
-        }
-
-        long maxTimeToInsert = 0, sum = 0;
-        long minTimeToInsert = 100000000; // 1000000000 is an upper bound for minTimeToInsert.
-        int cnt = 0;
-        for (final String word : sWords) {
-            final long diff = insertAndCheckWord(file, word,
-                    cnt % FormatSpec.MAX_TERMINAL_FREQUENCY, false, null, null, formatVersion);
-            maxTimeToInsert = Math.max(maxTimeToInsert, diff);
-            minTimeToInsert = Math.min(minTimeToInsert, diff);
-            sum += diff;
-            cnt++;
-        }
-        cnt = 0;
-        for (final String word : sWords) {
-            MoreAsserts.assertNotEqual(FormatSpec.NOT_VALID_WORD, getWordPosition(file, word));
-        }
-
-        Log.d(TAG, "Test version " + formatVersion);
-        Log.d(TAG, "max = " + ((double)maxTimeToInsert/1000000) + " ms.");
-        Log.d(TAG, "min = " + ((double)minTimeToInsert/1000000) + " ms.");
-        Log.d(TAG, "avg = " + ((double)sum/mMaxUnigrams/1000000) + " ms.");
-    }
-
-    public void testRandomWords() {
-        runTestRandomWords(VERSION3);
-    }
-}
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictUtils.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictUtils.java
new file mode 100644
index 0000000..f7a808c
--- /dev/null
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictUtils.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.makedict;
+
+import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
+import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
+import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
+
+import java.io.File;
+import java.util.HashMap;
+
+public class BinaryDictUtils {
+    public static final int USE_BYTE_ARRAY = 1;
+    public static final int USE_BYTE_BUFFER = 2;
+
+    public static final String TEST_DICT_FILE_EXTENSION = ".testDict";
+
+    public static final FormatSpec.FormatOptions VERSION2_OPTIONS =
+            new FormatSpec.FormatOptions(FormatSpec.VERSION2);
+    public static final FormatSpec.FormatOptions VERSION4_OPTIONS_WITHOUT_TIMESTAMP =
+            new FormatSpec.FormatOptions(FormatSpec.VERSION4, false /* hasTimestamp */);
+    public static final FormatSpec.FormatOptions VERSION4_OPTIONS_WITH_TIMESTAMP =
+            new FormatSpec.FormatOptions(FormatSpec.VERSION4, true /* hasTimestamp */);
+
+    public static DictionaryOptions makeDictionaryOptions(final String id, final String version) {
+        final DictionaryOptions options = new DictionaryOptions(new HashMap<String, String>());
+        options.mAttributes.put(FileHeader.DICTIONARY_LOCALE_ATTRIBUTE, "en_US");
+        options.mAttributes.put(FileHeader.DICTIONARY_ID_ATTRIBUTE, id);
+        options.mAttributes.put(FileHeader.DICTIONARY_VERSION_ATTRIBUTE, version);
+        return options;
+    }
+
+    public static File getDictFile(final String name, final String version,
+            final FormatOptions formatOptions, final File directory) {
+        if (formatOptions.mVersion == FormatSpec.VERSION2) {
+            return new File(directory, name + "." + version + TEST_DICT_FILE_EXTENSION);
+        } else if (formatOptions.mVersion == FormatSpec.VERSION4) {
+            return new File(directory, name + "." + version);
+        } else {
+            throw new RuntimeException("the format option has a wrong version : "
+                    + formatOptions.mVersion);
+        }
+    }
+
+    public static DictEncoder getDictEncoder(final File file, final FormatOptions formatOptions) {
+        if (formatOptions.mVersion == FormatSpec.VERSION4) {
+            if (!file.isDirectory()) {
+                file.mkdir();
+            }
+            return new Ver4DictEncoder(file);
+        } else if (formatOptions.mVersion == FormatSpec.VERSION2) {
+            return new Ver2DictEncoder(file);
+        } else {
+            throw new RuntimeException("The format option has a wrong version : "
+                    + formatOptions.mVersion);
+        }
+    }
+}
diff --git a/tests/src/com/android/inputmethod/latin/makedict/Ver3DictDecoderTests.java b/tests/src/com/android/inputmethod/latin/makedict/Ver2DictDecoderTests.java
similarity index 94%
rename from tests/src/com/android/inputmethod/latin/makedict/Ver3DictDecoderTests.java
rename to tests/src/com/android/inputmethod/latin/makedict/Ver2DictDecoderTests.java
index 9611599..a85753e 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/Ver3DictDecoderTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/Ver2DictDecoderTests.java
@@ -32,10 +32,10 @@
 import java.io.IOException;
 
 /**
- * Unit tests for Ver3DictDecoder
+ * Unit tests for Ver2DictDecoder
  */
-public class Ver3DictDecoderTests extends AndroidTestCase {
-    private static final String TAG = Ver3DictDecoderTests.class.getSimpleName();
+public class Ver2DictDecoderTests extends AndroidTestCase {
+    private static final String TAG = Ver2DictDecoderTests.class.getSimpleName();
 
     private final byte[] data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
 
@@ -68,7 +68,7 @@
         }
 
         assertNotNull(testFile);
-        final Ver3DictDecoder dictDecoder = new Ver3DictDecoder(testFile, factory);
+        final Ver2DictDecoder dictDecoder = new Ver2DictDecoder(testFile, factory);
         try {
             dictDecoder.openDictBuffer();
         } catch (Exception e) {
@@ -110,7 +110,7 @@
             Log.e(TAG, "IOException while the creating temporary file", e);
         }
 
-        final Ver3DictDecoder dictDecoder = new Ver3DictDecoder(testFile, factory);
+        final Ver2DictDecoder dictDecoder = new Ver2DictDecoder(testFile, factory);
 
         // the default return value of getBuffer() must be null.
         assertNull("the default return value of getBuffer() is not null",
diff --git a/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
index 7c1decb..17423a7 100644
--- a/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
@@ -16,8 +16,6 @@
 
 package com.android.inputmethod.latin.personalization;
 
-import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
 import android.test.AndroidTestCase;
 import android.test.suitebuilder.annotation.LargeTest;
 import android.util.Log;
@@ -28,6 +26,7 @@
 import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import java.util.Random;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
@@ -38,21 +37,12 @@
 @LargeTest
 public class UserHistoryDictionaryTests extends AndroidTestCase {
     private static final String TAG = UserHistoryDictionaryTests.class.getSimpleName();
-    private SharedPreferences mPrefs;
 
     private static final String[] CHARACTERS = {
         "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
         "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"
     };
 
-    private static final int MIN_USER_HISTORY_DICTIONARY_FILE_SIZE = 1000;
-    private static final int WAIT_TERMINATING_IN_MILLISECONDS = 100;
-
-    @Override
-    public void setUp() {
-        mPrefs = PreferenceManager.getDefaultSharedPreferences(getContext());
-    }
-
     /**
      * Generates a random word.
      */
@@ -78,7 +68,8 @@
     private void addToDict(final UserHistoryDictionary dict, final List<String> words) {
         String prevWord = null;
         for (String word : words) {
-            dict.addToDictionary(prevWord, word, true);
+            dict.addToDictionary(prevWord, word, true,
+                    (int)TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis()));
             prevWord = word;
         }
     }
@@ -92,14 +83,11 @@
         final List<String> words = generateWords(numberOfWords, random);
         final UserHistoryDictionary dict =
                 PersonalizationHelper.getUserHistoryDictionary(getContext(),
-                        testFilenameSuffix /* locale */, mPrefs);
+                        new Locale(testFilenameSuffix));
         // Add random words to the user history dictionary.
         addToDict(dict, words);
         if (checkContents) {
-            try {
-                Thread.sleep(TimeUnit.MILLISECONDS.convert(5L, TimeUnit.SECONDS));
-            } catch (InterruptedException e) {
-            }
+            dict.waitAllTasksForTests();
             for (int i = 0; i < numberOfWords; ++i) {
                 final String word = words.get(i);
                 assertTrue(dict.isInDictionaryForTests(word));
@@ -116,7 +104,7 @@
     private void clearHistory(final String testFilenameSuffix) {
         final UserHistoryDictionary dict =
                 PersonalizationHelper.getUserHistoryDictionary(getContext(),
-                        testFilenameSuffix /* locale */, mPrefs);
+                        new Locale(testFilenameSuffix));
         dict.clearAndFlushDictionary();
         dict.close();
     }
@@ -126,23 +114,16 @@
      * @param testFilenameSuffix file name suffix used for testing.
      */
     private void waitForWriting(final String testFilenameSuffix) {
-        try {
-            final UserHistoryDictionary dict =
-                    PersonalizationHelper.getUserHistoryDictionary(getContext(),
-                            testFilenameSuffix, mPrefs);
-            dict.shutdownExecutorForTests();
-            while (!dict.isTerminatedForTests()) {
-                Thread.sleep(WAIT_TERMINATING_IN_MILLISECONDS);
-            }
-        } catch (InterruptedException e) {
-            Log.d(TAG, "InterruptedException: ", e);
-        }
+        final UserHistoryDictionary dict =
+                PersonalizationHelper.getUserHistoryDictionary(getContext(),
+                        new Locale(testFilenameSuffix));
+        dict.waitAllTasksForTests();
     }
 
     public void testRandomWords() {
         Log.d(TAG, "This test can be used for profiling.");
         Log.d(TAG, "Usage: please set UserHistoryDictionary.PROFILE_SAVE_RESTORE to true.");
-        final String testFilenameSuffix = "testRandomWords" + System.currentTimeMillis();
+        final String testFilenameSuffix = "test_random_words" + System.currentTimeMillis();
         final String fileName = UserHistoryDictionary.NAME + "." + testFilenameSuffix
                 + ExpandableBinaryDictionary.DICT_FILE_EXTENSION;
 
@@ -159,7 +140,6 @@
             final File dictFile = new File(getContext().getFilesDir(), fileName);
             if (dictFile != null) {
                 assertTrue(dictFile.exists());
-                assertTrue(dictFile.length() >= MIN_USER_HISTORY_DICTIONARY_FILE_SIZE);
                 dictFile.delete();
             }
         }
@@ -177,9 +157,9 @@
 
             // Create filename suffixes for this test.
             for (int i = 0; i < numberOfLanguages; i++) {
-                testFilenameSuffixes[i] = "testSwitchingLanguages" + i;
-                final String fileName = UserHistoryDictionary.NAME + "." +
-                        testFilenameSuffixes[i] + ExpandableBinaryDictionary.DICT_FILE_EXTENSION;
+                testFilenameSuffixes[i] = "test_switching_languages" + i;
+                final String fileName = UserHistoryDictionary.NAME + "." + testFilenameSuffixes[i]
+                        + ExpandableBinaryDictionary.DICT_FILE_EXTENSION;
                 dictFiles[i] = new File(getContext().getFilesDir(), fileName);
                 clearHistory(testFilenameSuffixes[i]);
             }
@@ -205,7 +185,6 @@
             for (final File file : dictFiles) {
                 if (file != null) {
                     assertTrue(file.exists());
-                    assertTrue(file.length() >= MIN_USER_HISTORY_DICTIONARY_FILE_SIZE);
                     file.delete();
                 }
             }
@@ -213,10 +192,8 @@
     }
 
     public void testAddManyWords() {
-        final String testFilenameSuffix = "testRandomWords" + System.currentTimeMillis();
-        final int numberOfWords =
-                ExpandableBinaryDictionary.ENABLE_BINARY_DICTIONARY_DYNAMIC_UPDATE ?
-                        10000 : 1000;
+        final String testFilenameSuffix = "test_random_words" + System.currentTimeMillis();
+        final int numberOfWords = 10000;
         final Random random = new Random(123456);
         clearHistory(testFilenameSuffix);
         try {
@@ -230,7 +207,6 @@
             final File dictFile = new File(getContext().getFilesDir(), fileName);
             if (dictFile != null) {
                 assertTrue(dictFile.exists());
-                assertTrue(dictFile.length() >= MIN_USER_HISTORY_DICTIONARY_FILE_SIZE);
                 dictFile.delete();
             }
         }
diff --git a/tests/src/com/android/inputmethod/latin/utils/ForgettingCurveTests.java b/tests/src/com/android/inputmethod/latin/utils/ForgettingCurveTests.java
deleted file mode 100644
index 823bd5d..0000000
--- a/tests/src/com/android/inputmethod/latin/utils/ForgettingCurveTests.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright (C) 2012 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.inputmethod.latin.utils;
-
-import android.test.AndroidTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
-
-@SmallTest
-public class ForgettingCurveTests extends AndroidTestCase {
-    public void testFcToFreq() {
-        for (int i = 0; i < Byte.MAX_VALUE; ++i) {
-            final byte fc = (byte)i;
-            final int e = UserHistoryForgettingCurveUtils.fcToElapsedTime(fc);
-            final int c = UserHistoryForgettingCurveUtils.fcToCount(fc);
-            final int l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            final byte fc2 = UserHistoryForgettingCurveUtils.calcFc(e, c, l);
-            assertEquals(fc, fc2);
-        }
-        byte fc = 0;
-        int l;
-        for (int i = 0; i < 4; ++i) {
-            for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
-                fc = UserHistoryForgettingCurveUtils.pushCount(fc, true);
-            }
-            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            assertEquals(l, Math.max(1, Math.min(i + 1, 3)));
-        }
-        fc = 0;
-        for (int i = 0; i < 4; ++i) {
-            for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
-                fc = UserHistoryForgettingCurveUtils.pushCount(fc, false);
-            }
-            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            assertEquals(l, Math.min(i + 1, 3));
-        }
-        for (int i = 0; i < 4; ++i) {
-            for (int j = 0; j < (UserHistoryForgettingCurveUtils.ELAPSED_TIME_MAX + 1); ++j) {
-                fc = UserHistoryForgettingCurveUtils.pushElapsedTime(fc);
-            }
-            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
-            assertEquals(l, Math.max(0, 2 - i));
-        }
-    }
-}
diff --git a/tests/src/com/android/inputmethod/latin/utils/StringUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/StringAndJsonUtilsTests.java
similarity index 87%
rename from tests/src/com/android/inputmethod/latin/utils/StringUtilsTests.java
rename to tests/src/com/android/inputmethod/latin/utils/StringAndJsonUtilsTests.java
index 4e396a1..0c88f34 100644
--- a/tests/src/com/android/inputmethod/latin/utils/StringUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/utils/StringAndJsonUtilsTests.java
@@ -26,7 +26,7 @@
 import java.util.Locale;
 
 @SmallTest
-public class StringUtilsTests extends AndroidTestCase {
+public class StringAndJsonUtilsTests extends AndroidTestCase {
     public void testContainsInArray() {
         assertFalse("empty array", StringUtils.containsInArray("key", new String[0]));
         assertFalse("not in 1 element", StringUtils.containsInArray("key", new String[] {
@@ -44,7 +44,7 @@
         }));
     }
 
-    public void testContainsInExtraValues() {
+    public void testContainsInCommaSplittableText() {
         assertFalse("null", StringUtils.containsInCommaSplittableText("key", null));
         assertFalse("empty", StringUtils.containsInCommaSplittableText("key", ""));
         assertFalse("not in 1 element",
@@ -56,7 +56,28 @@
         assertTrue("in 2 elements", StringUtils.containsInCommaSplittableText("key", "key1,key"));
     }
 
-    public void testAppendToExtraValuesIfNotExists() {
+    public void testJoinCommaSplittableText() {
+        assertEquals("2 nulls", "",
+                StringUtils.joinCommaSplittableText(null, null));
+        assertEquals("null and empty", "",
+                StringUtils.joinCommaSplittableText(null, ""));
+        assertEquals("empty and null", "",
+                StringUtils.joinCommaSplittableText("", null));
+        assertEquals("2 empties", "",
+                StringUtils.joinCommaSplittableText("", ""));
+        assertEquals("text and null", "text",
+                StringUtils.joinCommaSplittableText("text", null));
+        assertEquals("text and empty", "text",
+                StringUtils.joinCommaSplittableText("text", ""));
+        assertEquals("null and text", "text",
+                StringUtils.joinCommaSplittableText(null, "text"));
+        assertEquals("empty and text", "text",
+                StringUtils.joinCommaSplittableText("", "text"));
+        assertEquals("2 texts", "text1,text2",
+                StringUtils.joinCommaSplittableText("text1", "text2"));
+    }
+
+    public void testAppendToCommaSplittableTextIfNotExists() {
         assertEquals("null", "key",
                 StringUtils.appendToCommaSplittableTextIfNotExists("key", null));
         assertEquals("empty", "key",
@@ -77,7 +98,7 @@
                 StringUtils.appendToCommaSplittableTextIfNotExists("key", "key1,key,key3"));
     }
 
-    public void testRemoveFromExtraValuesIfExists() {
+    public void testRemoveFromCommaSplittableTextIfExists() {
         assertEquals("null", "", StringUtils.removeFromCommaSplittableTextIfExists("key", null));
         assertEquals("empty", "", StringUtils.removeFromCommaSplittableTextIfExists("key", ""));
 
@@ -271,11 +292,25 @@
         assertTrue(bytesStr.equals(bytesStr2));
     }
 
-    public void testJsonStringUtils() {
+    public void testContainsOnlyWhitespace() {
+        assertTrue(StringUtils.containsOnlyWhitespace("   "));
+        assertTrue(StringUtils.containsOnlyWhitespace(""));
+        assertTrue(StringUtils.containsOnlyWhitespace("  \n\t\t"));
+        // U+2002 : EN SPACE
+        // U+2003 : EM SPACE
+        // U+3000 : IDEOGRAPHIC SPACE (commonly "double-width space")
+        assertTrue(StringUtils.containsOnlyWhitespace("\u2002\u2003\u3000"));
+        assertFalse(StringUtils.containsOnlyWhitespace("  a "));
+        assertFalse(StringUtils.containsOnlyWhitespace(". "));
+        assertFalse(StringUtils.containsOnlyWhitespace("."));
+        assertTrue(StringUtils.containsOnlyWhitespace(""));
+    }
+
+    public void testJsonUtils() {
         final Object[] objs = new Object[] { 1, "aaa", "bbb", 3 };
         final List<Object> objArray = Arrays.asList(objs);
-        final String str = StringUtils.listToJsonStr(objArray);
-        final List<Object> newObjArray = StringUtils.jsonStrToList(str);
+        final String str = JsonUtils.listToJsonStr(objArray);
+        final List<Object> newObjArray = JsonUtils.jsonStrToList(str);
         for (int i = 0; i < objs.length; ++i) {
             assertEquals(objs[i], newObjArray.get(i));
         }
diff --git a/tests/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtilsTests.java
index 856b2db..ccdd567 100644
--- a/tests/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/utils/SubtypeLocaleUtilsTests.java
@@ -41,7 +41,9 @@
     InputMethodSubtype ES_US;
     InputMethodSubtype FR;
     InputMethodSubtype FR_CA;
+    InputMethodSubtype FR_CH;
     InputMethodSubtype DE;
+    InputMethodSubtype DE_CH;
     InputMethodSubtype ZZ;
     InputMethodSubtype DE_QWERTY;
     InputMethodSubtype FR_QWERTZ;
@@ -70,8 +72,12 @@
                 Locale.FRENCH.toString(), "azerty");
         FR_CA = mRichImm.findSubtypeByLocaleAndKeyboardLayoutSet(
                 Locale.CANADA_FRENCH.toString(), "qwerty");
+        FR_CH = mRichImm.findSubtypeByLocaleAndKeyboardLayoutSet(
+                "fr_CH", "swiss");
         DE = mRichImm.findSubtypeByLocaleAndKeyboardLayoutSet(
                 Locale.GERMAN.toString(), "qwertz");
+        DE_CH = mRichImm.findSubtypeByLocaleAndKeyboardLayoutSet(
+                "de_CH", "swiss");
         ZZ = mRichImm.findSubtypeByLocaleAndKeyboardLayoutSet(
                 SubtypeLocaleUtils.NO_LANGUAGE, "qwerty");
         DE_QWERTY = AdditionalSubtypeUtils.createAdditionalSubtype(
@@ -112,7 +118,9 @@
         assertEquals("es_US", "spanish", SubtypeLocaleUtils.getKeyboardLayoutSetName(ES_US));
         assertEquals("fr   ", "azerty", SubtypeLocaleUtils.getKeyboardLayoutSetName(FR));
         assertEquals("fr_CA", "qwerty", SubtypeLocaleUtils.getKeyboardLayoutSetName(FR_CA));
+        assertEquals("fr_CH", "swiss", SubtypeLocaleUtils.getKeyboardLayoutSetName(FR_CH));
         assertEquals("de   ", "qwertz", SubtypeLocaleUtils.getKeyboardLayoutSetName(DE));
+        assertEquals("de_CH", "swiss", SubtypeLocaleUtils.getKeyboardLayoutSetName(DE_CH));
         assertEquals("zz   ", "qwerty", SubtypeLocaleUtils.getKeyboardLayoutSetName(ZZ));
     }
 
@@ -125,7 +133,9 @@
     //  es_US spanish F  Spanish (US)            exception
     //  fr    azerty  F  French
     //  fr_CA qwerty  F  French (Canada)
+    //  fr_CH swiss   F  French (Switzerland)
     //  de    qwertz  F  German
+    //  de_CH swiss   F  German (Switzerland)
     //  zz    qwerty  F  Alphabet (QWERTY)
     //  fr    qwertz  T  French (QWERTZ)
     //  de    qwerty  T  German (QWERTY)
@@ -148,8 +158,12 @@
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(FR));
                 assertEquals("fr_CA", "French (Canada)",
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(FR_CA));
+                assertEquals("fr_CH", "French (Switzerland)",
+                        SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(FR_CH));
                 assertEquals("de   ", "German",
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(DE));
+                assertEquals("de_CH", "German (Switzerland)",
+                        SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(DE_CH));
                 assertEquals("zz   ", "Alphabet (QWERTY)",
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(ZZ));
                 return null;
@@ -189,7 +203,9 @@
     //  es_US spanish F  Espagnol (États-Unis)            exception
     //  fr    azerty  F  Français
     //  fr_CA qwerty  F  Français (Canada)
+    //  fr_CH swiss   F  Français (Suisse)
     //  de    qwertz  F  Allemand
+    //  de_CH swiss   F  Allemand (Suisse)
     //  zz    qwerty  F  Aucune langue (QWERTY)
     //  fr    qwertz  T  Français (QWERTZ)
     //  de    qwerty  T  Allemand (QWERTY)
@@ -212,8 +228,12 @@
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(FR));
                 assertEquals("fr_CA", "Français (Canada)",
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(FR_CA));
+                assertEquals("fr_CH", "Français (Suisse)",
+                        SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(FR_CH));
                 assertEquals("de   ", "Allemand",
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(DE));
+                assertEquals("de_CH", "Allemand (Suisse)",
+                        SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(DE_CH));
                 assertEquals("zz   ", "Alphabet latin (QWERTY)",
                         SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(ZZ));
                 return null;
@@ -300,7 +320,9 @@
     //  es_US spanish F  Es  Español   Español (EE.UU.)       exception
     //  fr    azerty  F  Fr  Français  Français
     //  fr_CA qwerty  F  Fr  Français  Français (Canada)
+    //  fr_CH swiss   F  Fr  Français  Français (Suisse)
     //  de    qwertz  F  De  Deutsch   Deutsch
+    //  de_CH swiss   F  De  Deutsch   Deutsch (Schweiz)
     //  zz    qwerty  F      QWERTY    QWERTY
     //  fr    qwertz  T  Fr  Français  Français
     //  de    qwerty  T  De  Deutsch   Deutsch
@@ -317,7 +339,11 @@
             assertEquals("fr   ", "Français",     SubtypeLocaleUtils.getFullDisplayName(FR));
             assertEquals("fr_CA", "Français (Canada)",
                     SubtypeLocaleUtils.getFullDisplayName(FR_CA));
+            assertEquals("fr_CH", "Français (Suisse)",
+                    SubtypeLocaleUtils.getFullDisplayName(FR_CH));
             assertEquals("de   ", "Deutsch",      SubtypeLocaleUtils.getFullDisplayName(DE));
+            assertEquals("de_CH", "Deutsch (Schweiz)",
+                    SubtypeLocaleUtils.getFullDisplayName(DE_CH));
             assertEquals("zz   ", "QWERTY",       SubtypeLocaleUtils.getFullDisplayName(ZZ));
 
             assertEquals("en_US", "English",  SubtypeLocaleUtils.getMiddleDisplayName(EN_US));
@@ -325,7 +351,9 @@
             assertEquals("es_US", "Español",  SubtypeLocaleUtils.getMiddleDisplayName(ES_US));
             assertEquals("fr   ", "Français", SubtypeLocaleUtils.getMiddleDisplayName(FR));
             assertEquals("fr_CA", "Français", SubtypeLocaleUtils.getMiddleDisplayName(FR_CA));
+            assertEquals("fr_CH", "Français", SubtypeLocaleUtils.getMiddleDisplayName(FR_CH));
             assertEquals("de   ", "Deutsch",  SubtypeLocaleUtils.getMiddleDisplayName(DE));
+            assertEquals("de_CH", "Deutsch",  SubtypeLocaleUtils.getMiddleDisplayName(DE_CH));
             assertEquals("zz   ", "QWERTY",   SubtypeLocaleUtils.getMiddleDisplayName(ZZ));
 
             assertEquals("en_US", "En", SubtypeLocaleUtils.getShortDisplayName(EN_US));
@@ -333,7 +361,9 @@
             assertEquals("es_US", "Es", SubtypeLocaleUtils.getShortDisplayName(ES_US));
             assertEquals("fr   ", "Fr", SubtypeLocaleUtils.getShortDisplayName(FR));
             assertEquals("fr_CA", "Fr", SubtypeLocaleUtils.getShortDisplayName(FR_CA));
+            assertEquals("fr_CH", "Fr", SubtypeLocaleUtils.getShortDisplayName(FR_CH));
             assertEquals("de   ", "De", SubtypeLocaleUtils.getShortDisplayName(DE));
+            assertEquals("de_CH", "De", SubtypeLocaleUtils.getShortDisplayName(DE_CH));
             assertEquals("zz   ", "",   SubtypeLocaleUtils.getShortDisplayName(ZZ));
             return null;
         }
diff --git a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
index 1944fd3..ae08b49 100644
--- a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
@@ -24,10 +24,12 @@
 import com.android.inputmethod.latin.makedict.DictDecoder;
 import com.android.inputmethod.latin.makedict.DictEncoder;
 import com.android.inputmethod.latin.makedict.FormatSpec;
+import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
 import com.android.inputmethod.latin.makedict.FusionDictionary;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNode;
-import com.android.inputmethod.latin.makedict.Ver3DictDecoder;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
+import com.android.inputmethod.latin.makedict.Ver2DictDecoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 import com.android.inputmethod.latin.personalization.UserHistoryDictionaryBigramList;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.BigramDictionaryInterface;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.OnAddWordListener;
@@ -52,6 +54,12 @@
     private static final ArrayList<String> NOT_HAVE_BIGRAM = new ArrayList<String>();
     private static final FormatSpec.FormatOptions FORMAT_OPTIONS = new FormatSpec.FormatOptions(2);
     private static final String TEST_DICT_FILE_EXTENSION = ".testDict";
+    private static final HashMap<String, String> HEADER_OPTIONS = new HashMap<String, String>();
+    static {
+        HEADER_OPTIONS.put(FileHeader.DICTIONARY_LOCALE_ATTRIBUTE, "en_US");
+        HEADER_OPTIONS.put(FileHeader.DICTIONARY_ID_ATTRIBUTE, "test");
+        HEADER_OPTIONS.put(FileHeader.DICTIONARY_VERSION_ATTRIBUTE, "1000");
+    }
 
     /**
      * Return same frequency for all words and bigrams
@@ -138,19 +146,15 @@
 
     private void writeDictToFile(final File file,
             final UserHistoryDictionaryBigramList bigramList) {
-        final DictEncoder dictEncoder = new Ver3DictEncoder(file);
-        UserHistoryDictIOUtils.writeDictionary(dictEncoder, this, bigramList, FORMAT_OPTIONS);
+        final DictEncoder dictEncoder = new Ver2DictEncoder(file);
+        UserHistoryDictIOUtils.writeDictionary(dictEncoder, this, bigramList, FORMAT_OPTIONS,
+                HEADER_OPTIONS);
     }
 
-    private void readDictFromFile(final File file, final OnAddWordListener listener) {
+    private void readDictFromFile(final File file, final OnAddWordListener listener)
+            throws IOException, FileNotFoundException, UnsupportedFormatException {
         final DictDecoder dictDecoder = FormatSpec.getDictDecoder(file, DictDecoder.USE_BYTEARRAY);
-        try {
-            dictDecoder.openDictBuffer();
-        } catch (FileNotFoundException e) {
-            Log.e(TAG, "file not found", e);
-        } catch (IOException e) {
-            Log.e(TAG, "IOException", e);
-        }
+        dictDecoder.openDictBuffer();
         UserHistoryDictIOUtils.readDictionaryBinary(dictDecoder, listener);
     }
 
@@ -163,13 +167,14 @@
         addBigramToBigramList("this", "was", addedWords, originalList);
         addBigramToBigramList("hello", "world", addedWords, originalList);
 
-        final FusionDictionary fusionDict =
-                UserHistoryDictIOUtils.constructFusionDictionary(this, originalList);
+        final FusionDictionary fusionDict = UserHistoryDictIOUtils.constructFusionDictionary(
+                this, originalList, HEADER_OPTIONS);
 
         checkWordsInFusionDict(fusionDict, addedWords);
     }
 
-    public void testReadAndWrite() {
+    public void testReadAndWrite() throws IOException, FileNotFoundException,
+            UnsupportedFormatException {
         final Context context = getContext();
 
         File file = null;
diff --git a/tools/dicttool/Android.mk b/tools/dicttool/Android.mk
index 3d09c05..95afb4c 100644
--- a/tools/dicttool/Android.mk
+++ b/tools/dicttool/Android.mk
@@ -27,10 +27,28 @@
 LATINIME_ANNOTATIONS_SOURCE_DIRECTORY := $(LATINIME_BASE_SOURCE_DIRECTORY)/annotations
 LATINIME_CORE_SOURCE_DIRECTORY := $(LATINIME_BASE_SOURCE_DIRECTORY)/latin
 MAKEDICT_CORE_SOURCE_DIRECTORY := $(LATINIME_CORE_SOURCE_DIRECTORY)/makedict
+
+# Dependencies for Dicttool. Most of these files are needed by BinaryDictionary.java. Note that
+# a significant part of the dependencies are mocked in the compat/ directory, with empty or
+# nearly-empty implementations, for parts that we don't use in Dicttool.
 USED_TARGETTED_UTILS := \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/BinaryDictionary.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/DicTraverseSession.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/Dictionary.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/InputPointers.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/LastComposedWord.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/LatinImeLogger.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/SuggestedWords.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/WordComposer.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/settings/NativeSuggestOptions.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/ByteArrayDictBuffer.java \
         $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/CollectionUtils.java \
-        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/JniUtils.java
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/FileUtils.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/JniUtils.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/LocaleUtils.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/ResizableIntArray.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/StringUtils.java \
+        $(LATINIME_CORE_SOURCE_DIRECTORY)/utils/UnigramProperty.java
 
 DICTTOOL_ONDEVICE_TESTS_DIRECTORY := \
         $(LATINIME_LOCAL_DIR)/tests/src/com/android/inputmethod/latin/makedict/
diff --git a/tools/dicttool/NativeLib.mk b/tools/dicttool/NativeLib.mk
index a3d3c02..05e5841 100644
--- a/tools/dicttool/NativeLib.mk
+++ b/tools/dicttool/NativeLib.mk
@@ -20,12 +20,17 @@
 
 LATINIME_DIR_RELATIVE_TO_DICTTOOL := ../..
 
+ifeq ($(FLAG_DBG), true)
+    $(warning Making debug version of native library)
+    LOCAL_CFLAGS += -DFLAG_DBG -funwind-tables -fno-inline
+endif #FLAG_DBG
+
 ifneq ($(strip $(HOST_JDK_IS_64BIT_VERSION)),)
 LOCAL_CFLAGS += -m64
 LOCAL_LDFLAGS += -m64
 endif #HOST_JDK_IS_64BIT_VERSION
 
-LOCAL_CFLAGS += -DHOST_TOOL -fPIC
+LOCAL_CFLAGS += -DHOST_TOOL -fPIC -Wno-deprecated
 LOCAL_NO_DEFAULT_COMPILER_FLAGS := true
 
 LATINIME_NATIVE_JNI_DIR := $(LATINIME_DIR_RELATIVE_TO_DICTTOOL)/native/jni
@@ -33,11 +38,7 @@
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/$(LATINIME_NATIVE_SRC_DIR)
 # Used in jni_common.cpp to avoid registering useless methods.
 
-LATIN_IME_JNI_SRC_FILES := \
-    com_android_inputmethod_latin_makedict_Ver3DictDecoder.cpp \
-    jni_common.cpp
-
-LATIN_IME_CORE_SRC_FILES :=
+include $(LOCAL_PATH)/$(LATINIME_NATIVE_JNI_DIR)/NativeFileList.mk
 
 LOCAL_SRC_FILES := \
     $(addprefix $(LATINIME_NATIVE_JNI_DIR)/, $(LATIN_IME_JNI_SRC_FILES)) \
@@ -48,4 +49,5 @@
 include $(BUILD_HOST_SHARED_LIBRARY)
 
 # Clear our private variables
+include $(LOCAL_PATH)/$(LATINIME_NATIVE_JNI_DIR)/CleanupNativeFileList.mk
 LATINIME_DIR_RELATIVE_TO_DICTTOOL := ../..
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/content/SharedPreferences.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/android/content/SharedPreferences.java
index 07e80f1..cfeb153 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/content/SharedPreferences.java
@@ -14,12 +14,10 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.content;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class SharedPreferences {
+    public interface OnSharedPreferenceChangeListener {
+        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key);
+    }
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/graphics/Rect.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/android/graphics/Rect.java
index 07e80f1..c7b61d7 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/graphics/Rect.java
@@ -14,12 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.graphics;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class Rect {
+}
diff --git a/tools/dicttool/compat/android/text/TextUtils.java b/tools/dicttool/compat/android/text/TextUtils.java
new file mode 100644
index 0000000..5a94b7d
--- /dev/null
+++ b/tools/dicttool/compat/android/text/TextUtils.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.text;
+
+public class TextUtils {
+    private TextUtils() { /* cannot be instantiated */ }
+
+    /**
+     * Returns true if the string is null or 0-length.
+     * @param str the string to be examined
+     * @return true if str is null or zero length
+     */
+    public static boolean isEmpty(CharSequence str) {
+        if (str == null || str.length() == 0)
+            return true;
+        else
+            return false;
+    }
+
+    /**
+     * Returns true if a and b are equal, including if they are both null.
+     * <p><i>Note: In platform versions 1.1 and earlier, this method only worked well if
+     * both the arguments were instances of String.</i></p>
+     * @param a first CharSequence to check
+     * @param b second CharSequence to check
+     * @return true if a and b are equal
+     */
+    public static boolean equals(CharSequence a, CharSequence b) {
+        if (a == b) return true;
+        int length;
+        if (a != null && b != null && (length = a.length()) == b.length()) {
+            if (a instanceof String && b instanceof String) {
+                return a.equals(b);
+            } else {
+                for (int i = 0; i < length; i++) {
+                    if (a.charAt(i) != b.charAt(i)) return false;
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Returns list of multiple {@link CharSequence} joined into a single
+     * {@link CharSequence} separated by localized delimiter such as ", ".
+     *
+     * @hide
+     */
+    public static CharSequence join(Iterable<CharSequence> list) {
+        final CharSequence delimiter = ", ";
+        return join(delimiter, list);
+    }
+
+    /**
+     * Returns a string containing the tokens joined by delimiters.
+     * @param tokens an array objects to be joined. Strings will be formed from
+     *     the objects by calling object.toString().
+     */
+    public static String join(CharSequence delimiter, Object[] tokens) {
+        StringBuilder sb = new StringBuilder();
+        boolean firstTime = true;
+        for (Object token: tokens) {
+            if (firstTime) {
+                firstTime = false;
+            } else {
+                sb.append(delimiter);
+            }
+            sb.append(token);
+        }
+        return sb.toString();
+    }
+
+    /**
+     * Returns a string containing the tokens joined by delimiters.
+     * @param tokens an array objects to be joined. Strings will be formed from
+     *     the objects by calling object.toString().
+     */
+    public static String join(CharSequence delimiter, Iterable tokens) {
+        StringBuilder sb = new StringBuilder();
+        boolean firstTime = true;
+        for (Object token: tokens) {
+            if (firstTime) {
+                firstTime = false;
+            } else {
+                sb.append(delimiter);
+            }
+            sb.append(token);
+        }
+        return sb.toString();
+    }
+
+}
diff --git a/tools/dicttool/compat/android/util/Log.java b/tools/dicttool/compat/android/util/Log.java
index b3b6dd8..9410e74 100644
--- a/tools/dicttool/compat/android/util/Log.java
+++ b/tools/dicttool/compat/android/util/Log.java
@@ -25,13 +25,19 @@
     public static void d(final String tag, final String message) {
         System.out.println(tag + " : " + message);
     }
-    public static void d(final String tag, final String message, final Throwable e) {
-        System.out.println(tag + " : " + message + " : " + e);
+    public static void d(final String tag, final String message, final Throwable t) {
+        System.out.println(tag + " : " + message + " : " + t);
     }
     public static void e(final String tag, final String message) {
         d(tag, message);
     }
-    public static void e(final String tag, final String message, final Throwable e) {
-        d(tag, message, e);
+    public static void e(final String tag, final String message, final Throwable t) {
+        d(tag, message, t);
+    }
+    public static void w(final String tag, final String message) {
+        d(tag, message);
+    }
+    public static void w(final String tag, final String message, final Throwable t) {
+        d(tag, message, t);
     }
 }
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/view/inputmethod/CompletionInfo.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/android/view/inputmethod/CompletionInfo.java
index 07e80f1..fbce725 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/view/inputmethod/CompletionInfo.java
@@ -14,12 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.view.inputmethod;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class CompletionInfo {
+    public final String getText() { return ""; }
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/android/view/inputmethod/EditorInfo.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/android/view/inputmethod/EditorInfo.java
index 07e80f1..9c71181 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/android/view/inputmethod/EditorInfo.java
@@ -14,12 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package android.view.inputmethod;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class EditorInfo {
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/keyboard/Key.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/keyboard/Key.java
index 07e80f1..1e63bb5 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/keyboard/Key.java
@@ -14,12 +14,11 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.keyboard;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class Key {
+    public final int getX() { return 0; }
+    public final int getY() { return 0; }
+    public final int getWidth() { return 0; }
+    public final int getHeight() { return 0; }
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/keyboard/Keyboard.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/keyboard/Keyboard.java
index 07e80f1..61b209f 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/keyboard/Keyboard.java
@@ -14,12 +14,9 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.keyboard;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class Keyboard {
+    private final Key KEY = new Key();
+    public final Key getKey(final int i) { return KEY; }
+}
diff --git a/tools/dicttool/compat/com/android/inputmethod/keyboard/ProximityInfo.java b/tools/dicttool/compat/com/android/inputmethod/keyboard/ProximityInfo.java
new file mode 100644
index 0000000..561b663
--- /dev/null
+++ b/tools/dicttool/compat/com/android/inputmethod/keyboard/ProximityInfo.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard;
+
+public class ProximityInfo {
+    public long getNativeProximityInfo() { return 0l; }
+    private static native long setProximityInfoNative(String locale,
+            int displayWidth, int displayHeight, int gridWidth, int gridHeight,
+            int mostCommonKeyWidth, int mostCommonKeyHeight, int[] proximityCharsArray,
+            int keyCount, int[] keyXCoordinates, int[] keyYCoordinates, int[] keyWidths,
+            int[] keyHeights, int[] keyCharCodes, float[] sweetSpotCenterXs,
+            float[] sweetSpotCenterYs, float[] sweetSpotRadii);
+    private static native void releaseProximityInfoNative(long nativeProximityInfo);
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/latin/LatinIME.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/latin/LatinIME.java
index 07e80f1..e7aa340 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/latin/LatinIME.java
@@ -14,12 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.latin;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class LatinIME {
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/latin/settings/AdditionalFeaturesSettingUtils.java
similarity index 66%
rename from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
rename to tools/dicttool/compat/com/android/inputmethod/latin/settings/AdditionalFeaturesSettingUtils.java
index 07e80f1..6a430d5 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/latin/settings/AdditionalFeaturesSettingUtils.java
@@ -14,12 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.latin.settings;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class AdditionalFeaturesSettingUtils {
+    public static final int ADDITIONAL_FEATURES_SETTINGS_SIZE = 0;
+}
diff --git a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h b/tools/dicttool/compat/com/android/inputmethod/latin/settings/SettingsValues.java
similarity index 66%
copy from native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
copy to tools/dicttool/compat/com/android/inputmethod/latin/settings/SettingsValues.java
index 07e80f1..0a84cde 100644
--- a/native/jni/com_android_inputmethod_latin_makedict_Ver3DictDecoder.h
+++ b/tools/dicttool/compat/com/android/inputmethod/latin/settings/SettingsValues.java
@@ -14,12 +14,10 @@
  * limitations under the License.
  */
 
-#ifndef _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
-#define _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+package com.android.inputmethod.latin.settings;
 
-#include "jni.h"
-
-namespace latinime {
-int register_Ver3DictDecoder(JNIEnv *env);
-} // namespace latinime
-#endif // _COM_ANDROID_INPUTMETHOD_LATIN_MAKEDICT_VER3DICTDECODER_H
+public class SettingsValues {
+    public boolean isWordCodePoint(final int code) {
+        return Character.isLetter(code);
+    }
+}
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java
index 4b67169..16f82da 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/CombinedInputOutput.java
@@ -50,8 +50,6 @@
     private static final String NOT_A_WORD_TAG = "not_a_word";
     private static final String WHITELIST_TAG = "whitelist";
     private static final String OPTIONS_TAG = "options";
-    private static final String GERMAN_UMLAUT_PROCESSING_OPTION = "german_umlaut_processing";
-    private static final String FRENCH_LIGATURE_PROCESSING_OPTION = "french_ligature_processing";
     private static final String COMMENT_LINE_STARTER = "#";
 
     /**
@@ -112,13 +110,9 @@
             attributes.put(keyValue[0], keyValue[1]);
         }
 
-        final boolean processUmlauts =
-                GERMAN_UMLAUT_PROCESSING_OPTION.equals(attributes.get(OPTIONS_TAG));
-        final boolean processLigatures =
-                FRENCH_LIGATURE_PROCESSING_OPTION.equals(attributes.get(OPTIONS_TAG));
         attributes.remove(OPTIONS_TAG);
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(), new DictionaryOptions(
-                attributes, processUmlauts, processLigatures));
+        final FusionDictionary dict =
+                new FusionDictionary(new PtNodeArray(), new DictionaryOptions(attributes));
 
         String line;
         String word = null;
@@ -216,11 +210,6 @@
             destination.write(options.get(DICTIONARY_TAG));
             options.remove(DICTIONARY_TAG);
         }
-        if (dict.mOptions.mGermanUmlautProcessing) {
-            destination.write("," + OPTIONS_TAG + "=" + GERMAN_UMLAUT_PROCESSING_OPTION);
-        } else if (dict.mOptions.mFrenchLigatureProcessing) {
-            destination.write("," + OPTIONS_TAG + "=" + FRENCH_LIGATURE_PROCESSING_OPTION);
-        }
         for (final String key : dict.mOptions.mAttributes.keySet()) {
             final String value = dict.mOptions.mAttributes.get(key);
             destination.write("," + key + "=" + value);
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java
index 5c7e8b4..143bce5 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/DictionaryMaker.java
@@ -23,7 +23,7 @@
 import com.android.inputmethod.latin.makedict.FusionDictionary;
 import com.android.inputmethod.latin.makedict.MakedictLog;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 import com.android.inputmethod.latin.makedict.Ver4DictEncoder;
 
 import java.io.BufferedWriter;
@@ -46,7 +46,6 @@
 
     static class Arguments {
         private static final String OPTION_VERSION_2 = "-2";
-        private static final String OPTION_VERSION_3 = "-3";
         private static final String OPTION_VERSION_4 = "-4";
         private static final String OPTION_INPUT_SOURCE = "-s";
         private static final String OPTION_INPUT_BIGRAM_XML = "-b";
@@ -158,10 +157,8 @@
                 if (arg.charAt(0) == '-') {
                     if (OPTION_VERSION_2.equals(arg)) {
                         // Do nothing, this is the default
-                    } else if (OPTION_VERSION_3.equals(arg)) {
-                        outputBinaryFormatVersion = 3;
                     } else if (OPTION_VERSION_4.equals(arg)) {
-                        outputBinaryFormatVersion = 4;
+                        outputBinaryFormatVersion = FormatSpec.VERSION4;
                     } else if (OPTION_HELP.equals(arg)) {
                         displayHelp();
                     } else {
@@ -358,10 +355,10 @@
         final File outputFile = new File(outputFilename);
         final FormatSpec.FormatOptions formatOptions = new FormatSpec.FormatOptions(version);
         final DictEncoder dictEncoder;
-        if (version == 4) {
+        if (version == FormatSpec.VERSION4) {
             dictEncoder = new Ver4DictEncoder(outputFile);
         } else {
-            dictEncoder = new Ver3DictEncoder(outputFile);
+            dictEncoder = new Ver2DictEncoder(outputFile);
         }
         dictEncoder.writeDictionary(dict, formatOptions);
     }
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java
index 66fd084..7ac3c67 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Diff.java
@@ -85,18 +85,6 @@
 
     private static void diffHeaders(final FusionDictionary dict0, final FusionDictionary dict1) {
         boolean hasDifferences = false;
-        if (dict0.mOptions.mFrenchLigatureProcessing != dict1.mOptions.mFrenchLigatureProcessing) {
-            System.out.println("  French ligature processing : "
-                    + dict0.mOptions.mFrenchLigatureProcessing + " <=> "
-                    + dict1.mOptions.mFrenchLigatureProcessing);
-            hasDifferences = true;
-        }
-        else if (dict0.mOptions.mGermanUmlautProcessing != dict1.mOptions.mGermanUmlautProcessing) {
-            System.out.println("  German umlaut processing : "
-                    + dict0.mOptions.mGermanUmlautProcessing + " <=> "
-                    + dict1.mOptions.mGermanUmlautProcessing);
-            hasDifferences = true;
-        }
         final HashMap<String, String> options1 =
                 new HashMap<String, String>(dict1.mOptions.mAttributes);
         for (final String optionKey : dict0.mOptions.mAttributes.keySet()) {
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Test.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Test.java
index 9174238..48817b1 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Test.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Test.java
@@ -18,7 +18,6 @@
 
 import com.android.inputmethod.latin.makedict.BinaryDictDecoderEncoderTests;
 import com.android.inputmethod.latin.makedict.BinaryDictEncoderFlattenTreeTests;
-import com.android.inputmethod.latin.makedict.BinaryDictIOUtilsTests;
 import com.android.inputmethod.latin.makedict.FusionDictionaryTest;
 
 import java.lang.reflect.Constructor;
@@ -31,15 +30,15 @@
  */
 public class Test extends Dicttool.Command {
     public static final String COMMAND = "test";
+    private static final int DEFAULT_MAX_UNIGRAMS = 1500;
     private long mSeed = System.currentTimeMillis();
-    private int mMaxUnigrams = BinaryDictIOUtilsTests.DEFAULT_MAX_UNIGRAMS;
+    private int mMaxUnigrams = DEFAULT_MAX_UNIGRAMS;
 
     private static final Class<?>[] sClassesToTest = {
         BinaryDictOffdeviceUtilsTests.class,
         FusionDictionaryTest.class,
         BinaryDictDecoderEncoderTests.class,
         BinaryDictEncoderFlattenTreeTests.class,
-        BinaryDictIOUtilsTests.class
     };
     private ArrayList<Method> mAllTestMethods = new ArrayList<Method>();
     private ArrayList<String> mUsedTestMethods = new ArrayList<String>();
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java
index 4e99bf9..d226251 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/XmlDictInputOutput.java
@@ -57,8 +57,6 @@
     private static final String NOT_A_WORD_ATTR = "not_a_word";
 
     private static final String OPTIONS_KEY = "options";
-    private static final String GERMAN_UMLAUT_PROCESSING_OPTION = "german_umlaut_processing";
-    private static final String FRENCH_LIGATURE_PROCESSING_OPTION = "french_ligature_processing";
 
     /**
      * SAX handler for a unigram XML file.
@@ -120,12 +118,8 @@
                     attributes.put(attrName, attrs.getValue(attrIndex));
                 }
                 final String optionsString = attributes.get(OPTIONS_KEY);
-                final boolean processUmlauts =
-                        GERMAN_UMLAUT_PROCESSING_OPTION.equals(optionsString);
-                final boolean processLigatures =
-                        FRENCH_LIGATURE_PROCESSING_OPTION.equals(optionsString);
                 mDictionary = new FusionDictionary(new PtNodeArray(),
-                        new DictionaryOptions(attributes, processUmlauts, processLigatures));
+                        new DictionaryOptions(attributes));
             } else {
                 mState = UNKNOWN;
             }
@@ -361,11 +355,6 @@
         // TODO: use an XMLSerializer if this gets big
         destination.write("<wordlist format=\"2\"");
         final HashMap<String, String> options = dict.mOptions.mAttributes;
-        if (dict.mOptions.mGermanUmlautProcessing) {
-            destination.write(" " + OPTIONS_KEY + "=\"" + GERMAN_UMLAUT_PROCESSING_OPTION + "\"");
-        } else if (dict.mOptions.mFrenchLigatureProcessing) {
-            destination.write(" " + OPTIONS_KEY + "=\"" + FRENCH_LIGATURE_PROCESSING_OPTION + "\"");
-        }
         for (final String key : dict.mOptions.mAttributes.keySet()) {
             final String value = dict.mOptions.mAttributes.get(key);
             destination.write(" " + key + "=\"" + value + "\"");
diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
index 1baeb7a..0c11f86 100644
--- a/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
@@ -24,7 +24,7 @@
 import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions;
 import com.android.inputmethod.latin.makedict.FusionDictionary.PtNodeArray;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
-import com.android.inputmethod.latin.makedict.Ver3DictEncoder;
+import com.android.inputmethod.latin.makedict.Ver2DictEncoder;
 
 import junit.framework.TestCase;
 
@@ -42,10 +42,16 @@
     private static final int TEST_FREQ = 37; // Some arbitrary value unlikely to happen by chance
 
     public void testGetRawDictWorks() throws IOException, UnsupportedFormatException {
+        final String VERSION = "1";
+        final String LOCALE = "test";
+        final String ID = "main:test";
+
         // Create a thrice-compressed dictionary file.
-        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new DictionaryOptions(new HashMap<String, String>(),
-                        false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */));
+        final DictionaryOptions testOptions = new DictionaryOptions(new HashMap<String, String>());
+        testOptions.mAttributes.put(FormatSpec.FileHeader.DICTIONARY_VERSION_ATTRIBUTE, VERSION);
+        testOptions.mAttributes.put(FormatSpec.FileHeader.DICTIONARY_LOCALE_ATTRIBUTE, LOCALE);
+        testOptions.mAttributes.put(FormatSpec.FileHeader.DICTIONARY_ID_ATTRIBUTE, ID);
+        final FusionDictionary dict = new FusionDictionary(new PtNodeArray(), testOptions);
         dict.add("foo", TEST_FREQ, null, false /* isNotAWord */);
         dict.add("fta", 1, null, false /* isNotAWord */);
         dict.add("ftb", 1, null, false /* isNotAWord */);
@@ -59,7 +65,7 @@
                 Compress.getCompressedStream(
                         Compress.getCompressedStream(
                                 new BufferedOutputStream(new FileOutputStream(dst)))));
-        final DictEncoder dictEncoder = new Ver3DictEncoder(out);
+        final DictEncoder dictEncoder = new Ver2DictEncoder(out);
         dictEncoder.writeDictionary(dict, new FormatOptions(2, false));
 
         // Test for an actually compressed dictionary and its contents
@@ -73,6 +79,12 @@
         final FusionDictionary resultDict = dictDecoder.readDictionaryBinary(
                 null /* dict : an optional dictionary to add words to, or null */,
                 false /* deleteDictIfBroken */);
+        assertEquals("Wrong version attribute", VERSION, resultDict.mOptions.mAttributes.get(
+                FormatSpec.FileHeader.DICTIONARY_VERSION_ATTRIBUTE));
+        assertEquals("Wrong locale attribute", LOCALE, resultDict.mOptions.mAttributes.get(
+                FormatSpec.FileHeader.DICTIONARY_LOCALE_ATTRIBUTE));
+        assertEquals("Wrong id attribute", ID, resultDict.mOptions.mAttributes.get(
+                FormatSpec.FileHeader.DICTIONARY_ID_ATTRIBUTE));
         assertEquals("Dictionary can't be read back correctly",
                 FusionDictionary.findWordInTree(resultDict.mRootNodeArray, "foo").getFrequency(),
                 TEST_FREQ);
diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java
index 5505823..c6e4976 100644
--- a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/BinaryDictEncoderFlattenTreeTests.java
@@ -32,8 +32,7 @@
     // that it does not contain any duplicates.
     public void testFlattenNodes() {
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new DictionaryOptions(new HashMap<String, String>(),
-                        false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */));
+                new DictionaryOptions(new HashMap<String, String>()));
         dict.add("foo", 1, null, false /* isNotAWord */);
         dict.add("fta", 1, null, false /* isNotAWord */);
         dict.add("ftb", 1, null, false /* isNotAWord */);
diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java
index 659650a..76dadc2 100644
--- a/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/makedict/FusionDictionaryTest.java
@@ -96,8 +96,7 @@
     // that it does not contain any duplicates.
     public void testFusion() {
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new DictionaryOptions(new HashMap<String, String>(),
-                        false /* germanUmlautProcessing */, false /* frenchLigatureProcessing */));
+                new DictionaryOptions(new HashMap<String, String>()));
         final long time = System.currentTimeMillis();
         prepare(time);
         for (int i = 0; i < sWords.size(); ++i) {
diff --git a/tools/make-keyboard-text/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl b/tools/make-keyboard-text/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
index 4cd9c23..a8ac981 100644
--- a/tools/make-keyboard-text/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
+++ b/tools/make-keyboard-text/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
@@ -87,11 +87,11 @@
         return (text == null) ? LANGUAGE_DEFAULT[id] : text;
     }
 
+    // These texts' name should be aligned with the @string/<name> in
+    // values*/strings-action-keys.xml.
     private static final String[] RESOURCE_NAMES = {
-        // These texts' name should be aligned with the @string/<name> in values/strings.xml.
         // Labels for action.
         "label_go_key",
-        // "label_search_key",
         "label_send_key",
         "label_next_key",
         "label_done_key",
@@ -113,6 +113,8 @@
     };
 
     /* @TEXTS@ */
+    // TODO: Use the language + "_" + region representation for the locale string key.
+    // Currently we are dropping the region from the key.
     private static final Object[] LANGUAGES_AND_TEXTS = {
         /* @LANGUAGES_AND_TEXTS@ */
     };
diff --git a/tools/make-keyboard-text/res/values-ar/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-ar/donottranslate-more-keys.xml
index 8b86b1b..f8050a3 100644
--- a/tools/make-keyboard-text/res/values-ar/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-ar/donottranslate-more-keys.xml
@@ -65,24 +65,27 @@
     <!-- U+060C: "،" ARABIC COMMA -->
     <string name="keylabel_for_comma">&#x060C;</string>
     <string name="more_keys_for_comma">"\\,"</string>
+    <!-- U+0651: "ّ" ARABIC SHADDA -->
+    <string name="keyhintlabel_for_period">&#x0651;</string>
+    <string name="more_keys_for_period">!text/more_keys_for_arabic_diacritics</string>
+    <string name="keyhintlabel_for_tablet_period">&#x0651;</string>
+    <string name="more_keys_for_tablet_period">!text/more_keys_for_arabic_diacritics</string>
     <string name="keylabel_for_symbols_question">&#x061F;</string>
     <string name="keylabel_for_symbols_semicolon">&#x061B;</string>
     <!-- U+066A: "٪" ARABIC PERCENT SIGN -->
     <string name="keylabel_for_symbols_percent">&#x066A;</string>
-    <string name="more_keys_for_symbols_question">\?</string>
+    <!-- U+00BF: "¿" INVERTED QUESTION MARK -->
+    <string name="more_keys_for_question">\?,&#x00BF;</string>
     <string name="more_keys_for_symbols_semicolon">;</string>
     <!-- U+2030: "‰" PER MILLE SIGN -->
     <string name="more_keys_for_symbols_percent">\\%,&#x2030;</string>
-    <!-- U+060C: "،" ARABIC COMMA
-         U+061B: "؛" ARABIC SEMICOLON
-         U+061F: "؟" ARABIC QUESTION MARK -->
-    <string name="keylabel_for_apostrophe">&#x060C;</string>
-    <string name="keyhintlabel_for_apostrophe">&#x061F;</string>
     <!-- U+061F: "؟" ARABIC QUESTION MARK
          U+060C: "،" ARABIC COMMA
          U+061B: "؛" ARABIC SEMICOLON -->
+    <string name="keylabel_for_tablet_comma">"&#x060C;"</string>
+    <string name="keyhintlabel_for_tablet_comma">"&#x061F;"</string>
+    <string name="more_keys_for_tablet_comma">"!fixedColumnOrder!4,:,!,&#x061F;,&#x061B;,-,/,\",\'"</string>
     <string name="more_keys_for_punctuation">"!fixedColumnOrder!8,\",\',#,-,:,!,&#x060C;,&#x061F;,\@,&amp;,\\%,+,&#x061B;,/,(|),)|("</string>
-    <string name="more_keys_for_apostrophe">"&#x061F;,&#x061B;,!,:,-,/,\',\""</string>
     <!-- U+266A: "♪" EIGHTH NOTE -->
     <string name="more_keys_for_bullet">&#x266A;</string>
     <!-- U+2605: "★" BLACK STAR
@@ -121,5 +124,4 @@
     <!-- In order to make Tatweel easily distinguishable from other punctuations, we use consecutive Tatweels only for its displayed label. -->
     <!-- Note: The space character is needed as a preceding letter to draw Arabic diacritics characters correctly. -->
     <string name="more_keys_for_arabic_diacritics">"!fixedColumnOrder!7,&#x20;&#x0655;|&#x0655;,&#x20;&#x0654;|&#x0654;,&#x20;&#x0652;|&#x0652;,&#x20;&#x064D;|&#x064D;,&#x20;&#x064C;|&#x064C;,&#x20;&#x064B;|&#x064B;,&#x20;&#x0651;|&#x0651;,&#x20;&#x0656;|&#x0656;,&#x20;&#x0670;|&#x0670;,&#x20;&#x0653;|&#x0653;,&#x20;&#x0650;|&#x0650;,&#x20;&#x064F;|&#x064F;,&#x20;&#x064E;|&#x064E;,&#x0640;&#x0640;&#x0640;|&#x0640;"</string>
-    <string name="keyhintlabel_for_arabic_diacritics">&#x0651;</string>
 </resources>
diff --git a/tools/make-keyboard-text/res/values-az/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-az-rAZ/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-az/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-az-rAZ/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values-be/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-be-rBY/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-be/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-be-rBY/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values-ca/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-ca/donottranslate-more-keys.xml
index 6639373..f63e85b 100644
--- a/tools/make-keyboard-text/res/values-ca/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-ca/donottranslate-more-keys.xml
@@ -72,7 +72,7 @@
     <string name="more_keys_for_l">l&#x00B7;l,&#x0142;</string>
     <!-- U+00B7: "·" MIDDLE DOT -->
     <string name="more_keys_for_punctuation">"!fixedColumnOrder!9,;,/,(,),#,&#x00B7;,!,\\,,\?,&amp;,\\%,+,\",-,:,',\@"</string>
-    <string name="more_keys_for_period">\?,&#x00B7;</string>
+    <string name="more_keys_for_tablet_punctuation">"!fixedColumnOrder!8,;,/,(,),#,&#x00B7;,',\\,,&amp;,\\%,+,\",-,:,\@"</string>
     <!-- U+00E7: "ç" LATIN SMALL LETTER C WITH CEDILLA -->
     <string name="keylabel_for_spanish_row2_10">&#x00E7;</string>
 </resources>
diff --git a/tools/make-keyboard-text/res/values-de/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-de/donottranslate-more-keys.xml
index 9dc8717..bb8bb72 100644
--- a/tools/make-keyboard-text/res/values-de/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-de/donottranslate-more-keys.xml
@@ -55,6 +55,18 @@
     <!-- U+00F1: "ñ" LATIN SMALL LETTER N WITH TILDE
          U+0144: "ń" LATIN SMALL LETTER N WITH ACUTE -->
     <string name="more_keys_for_n">&#x00F1;,&#x0144;</string>
+    <!-- U+00FC: "ü" LATIN SMALL LETTER U WITH DIAERESIS -->
+    <string name="keylabel_for_swiss_row1_11">&#x00FC;</string>
+    <!-- U+00E8: "è" LATIN SMALL LETTER E WITH GRAVE -->
+    <string name="more_keys_for_swiss_row1_11">&#x00E8;</string>
+    <!-- U+00F6: "ö" LATIN SMALL LETTER O WITH DIAERESIS -->
+    <string name="keylabel_for_swiss_row2_10">&#x00F6;</string>
+    <!-- U+00E9: "é" LATIN SMALL LETTER E WITH ACUTE -->
+    <string name="more_keys_for_swiss_row2_10">&#x00E9;</string>
+    <!-- U+00E4: "ä" LATIN SMALL LETTER A WITH DIAERESIS -->
+    <string name="keylabel_for_swiss_row2_11">&#x00E4;</string>
+    <!-- U+00E0: "à" LATIN SMALL LETTER A WITH GRAVE -->
+    <string name="more_keys_for_swiss_row2_11">&#x00E0;</string>
     <string name="single_quotes">!text/single_9qm_lqm</string>
     <string name="double_quotes">!text/double_9qm_lqm</string>
     <string name="single_angle_quotes">!text/single_raqm_laqm</string>
diff --git a/tools/make-keyboard-text/res/values-es/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-es/donottranslate-more-keys.xml
index 8e6b4ee..f4fe7f7 100644
--- a/tools/make-keyboard-text/res/values-es/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-es/donottranslate-more-keys.xml
@@ -67,16 +67,7 @@
          U+0107: "ć" LATIN SMALL LETTER C WITH ACUTE
          U+010D: "č" LATIN SMALL LETTER C WITH CARON -->
     <string name="more_keys_for_c">&#x00E7;,&#x0107;,&#x010D;</string>
-    <!-- U+00F1: "ñ" LATIN SMALL LETTER N WITH TILDE -->
-    <string name="keylabel_for_spanish_row2_10">&#x00F1;</string>
     <!-- U+00A1: "¡" INVERTED EXCLAMATION MARK
          U+00BF: "¿" INVERTED QUESTION MARK -->
-    <string name="more_keys_for_punctuation">"!fixedColumnOrder!4,;,!,\\,,\?,:,&#x00A1;,\@,&#x00BF;"</string>
-    <!-- U+00A1: "¡" INVERTED EXCLAMATION MARK -->
-    <string name="more_keys_for_tablet_comma">"!,&#x00A1;"</string>
-    <!-- U+00BF: "¿" INVERTED QUESTION MARK -->
-    <string name="more_keys_for_period">"\?,&#x00BF;"</string>
-    <string name="keylabel_for_apostrophe">\"</string>
-    <string name="keyhintlabel_for_apostrophe">\'</string>
-    <string name="more_keys_for_apostrophe">\'</string>
+    <string name="more_keys_for_punctuation">"!fixedColumnOrder!9,&#x00A1;,;,/,(,),#,!,\\,,\?,&#x00BF;,&amp;,\\%,+,\",-,:,',\@"</string>
 </resources>
diff --git a/tools/make-keyboard-text/res/values-et/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-et-rEE/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-et/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-et-rEE/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values-fa/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-fa/donottranslate-more-keys.xml
index ab4fbda..5bcfe7f 100644
--- a/tools/make-keyboard-text/res/values-fa/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-fa/donottranslate-more-keys.xml
@@ -65,11 +65,17 @@
     <!-- U+060C: "،" ARABIC COMMA -->
     <string name="keylabel_for_comma">&#x060C;</string>
     <string name="more_keys_for_comma">"\\,"</string>
+    <!-- U+064B: "ً" ARABIC FATHATAN -->
+    <string name="keyhintlabel_for_period">&#x064B;</string>
+    <string name="more_keys_for_period">!text/more_keys_for_arabic_diacritics</string>
+    <string name="keyhintlabel_for_tablet_period">&#x064B;</string>
+    <string name="more_keys_for_tablet_period">!text/more_keys_for_arabic_diacritics</string>
     <string name="keylabel_for_symbols_question">&#x061F;</string>
     <string name="keylabel_for_symbols_semicolon">&#x061B;</string>
     <!-- U+066A: "٪" ARABIC PERCENT SIGN -->
     <string name="keylabel_for_symbols_percent">&#x066A;</string>
-    <string name="more_keys_for_symbols_question">\?</string>
+    <!-- U+00BF: "¿" INVERTED QUESTION MARK -->
+    <string name="more_keys_for_question">\?,&#x00BF;</string>
     <string name="more_keys_for_symbols_semicolon">;</string>
     <!-- U+2030: "‰" PER MILLE SIGN -->
     <string name="more_keys_for_symbols_percent">\\%,&#x2030;</string>
@@ -79,13 +85,9 @@
          U+00AB: "«" LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
          U+00BB: "»" RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK -->
     <string name="keylabel_for_tablet_comma">"&#x060C;"</string>
-    <string name="keyhintlabel_for_tablet_comma">"!"</string>
-    <string name="more_keys_for_tablet_comma">"!,\\,"</string>
+    <string name="keyhintlabel_for_tablet_comma">"&#x061F;"</string>
+    <string name="more_keys_for_tablet_comma">"!fixedColumnOrder!4,:,!,&#x061F;,&#x061B;,-,/,&#x00AB;|&#x00BB;,&#x00BB;|&#x00AB;"</string>
     <string name="keyhintlabel_for_period">"&#x061F;"</string>
-    <string name="more_keys_for_period">"&#x061F;,\?"</string>
-    <string name="keylabel_for_apostrophe">&#x060C;</string>
-    <string name="keyhintlabel_for_apostrophe">&#x061F;</string>
-    <string name="more_keys_for_apostrophe">"!fixedColumnOrder!4,:,!,&#x061F;,&#x061B;,-,/,&#x00AB;|&#x00BB;,&#x00BB;|&#x00AB;"</string>
     <!-- U+FDFC: "﷼" RIAL SIGN -->
     <string name="keylabel_for_currency">&#xFDFC;</string>
     <!-- U+061F: "؟" ARABIC QUESTION MARK
@@ -130,5 +132,4 @@
     <!-- In order to make Tatweel easily distinguishable from other punctuations, we use consecutive Tatweels only for its displayed label. -->
     <!-- Note: The space character is needed as a preceding letter to draw Arabic diacritics characters correctly. -->
     <string name="more_keys_for_arabic_diacritics">"!fixedColumnOrder!7,&#x20;&#x0655;|&#x0655;,&#x20;&#x0652;|&#x0652;,&#x20;&#x0651;|&#x0651;,&#x20;&#x064C;|&#x064C;,&#x20;&#x064D;|&#x064D;,&#x20;&#x064B;|&#x064B;,&#x20;&#x0654;|&#x0654;,&#x20;&#x0656;|&#x0656;,&#x20;&#x0670;|&#x0670;,&#x20;&#x0653;|&#x0653;,&#x20;&#x064F;|&#x064F;,&#x20;&#x0650;|&#x0650;,&#x20;&#x064E;|&#x064E;,&#x0640;&#x0640;&#x0640;|&#x0640;"</string>
-    <string name="keyhintlabel_for_arabic_diacritics">&#x064B;</string>
 </resources>
diff --git a/tools/make-keyboard-text/res/values-fr/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-fr/donottranslate-more-keys.xml
index 7b11a18..6656776 100644
--- a/tools/make-keyboard-text/res/values-fr/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-fr/donottranslate-more-keys.xml
@@ -65,4 +65,16 @@
     <string name="more_keys_for_c">&#x00E7;,&#x0107;,&#x010D;</string>
     <!-- U+00FF: "ÿ" LATIN SMALL LETTER Y WITH DIAERESIS -->
     <string name="more_keys_for_y">%,&#x00FF;</string>
+    <!-- U+00E8: "è" LATIN SMALL LETTER E WITH GRAVE -->
+    <string name="keylabel_for_swiss_row1_11">&#x00E8;</string>
+    <!-- U+00FC: "ü" LATIN SMALL LETTER U WITH DIAERESIS -->
+    <string name="more_keys_for_swiss_row1_11">&#x00FC;</string>
+    <!-- U+00E9: "é" LATIN SMALL LETTER E WITH ACUTE -->
+    <string name="keylabel_for_swiss_row2_10">&#x00E9;</string>
+    <!-- U+00F6: "ö" LATIN SMALL LETTER O WITH DIAERESIS -->
+    <string name="more_keys_for_swiss_row2_10">&#x00F6;</string>
+    <!-- U+00E0: "à" LATIN SMALL LETTER A WITH GRAVE -->
+    <string name="keylabel_for_swiss_row2_11">&#x00E0;</string>
+    <!-- U+00E4: "ä" LATIN SMALL LETTER A WITH DIAERESIS -->
+    <string name="more_keys_for_swiss_row2_11">&#x00E4;</string>
 </resources>
diff --git a/tools/make-keyboard-text/res/values-hy/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-hy-rAM/donottranslate-more-keys.xml
similarity index 72%
rename from tools/make-keyboard-text/res/values-hy/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-hy-rAM/donottranslate-more-keys.xml
index 2f34128..73fe927 100644
--- a/tools/make-keyboard-text/res/values-hy/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-hy-rAM/donottranslate-more-keys.xml
@@ -26,15 +26,21 @@
     <!-- U+055A: "՚" ARMENIAN APOSTROPHE -->
     <!-- U+055B: "՛" ARMENIAN EMPHASIS MARK -->
     <!-- U+055F: "՟" ARMENIAN ABBREVIATION MARK -->
-    <string name="more_keys_for_punctuation">"!fixedColumnOrder!8,!,?,\\,,.,&#x058A;,&#x055C;,&#x055D;,&#x055E;,:,;,\@,&#x0559;,&#x055A;,&#x055B;,&#x055F;"</string>
+    <string name="more_keys_for_punctuation">"!fixedColumnOrder!8,!,?,&#x0559;,&#x055A;,.,&#x055C;,\\,,&#x055E;,:,;,&#x055F;,&#x00AB;,&#x00BB;,&#x058A;,&#x055D;,&#x055B;"</string>
     <!-- U+055E: "՞" ARMENIAN QUESTION MARK -->
     <!-- U+00BF: "¿" INVERTED QUESTION MARK -->
-    <string name="more_keys_for_symbols_question">&#x055E;,&#x00BF;</string>
+    <string name="more_keys_for_question">&#x055E;,&#x00BF;</string>
     <!-- U+055C: "՜" ARMENIAN EXCLAMATION MARK -->
     <!-- U+00A1: "¡" INVERTED EXCLAMATION MARK -->
-    <string name="more_keys_for_symbols_exclamation">&#x055C;,&#x00A1;</string>
+    <string name="more_keys_for_exclamation">&#x055C;,&#x00A1;</string>
     <!-- U+058F: "֏" ARMENIAN DRAM SIGN -->
     <!-- TODO: Enable this when we have glyph for the following letter
          <string name="keylabel_for_currency">&#x058F;</string>
     -->
+    <!-- U+055D: "՝" ARMENIAN COMMA -->
+    <string name="keylabel_for_tablet_comma">&#x055D;</string>
+    <!-- U+0589: "։" ARMENIAN FULL STOP -->
+    <string name="keylabel_for_period">&#x0589;</string>
+    <string name="keylabel_for_tablet_period">&#x0589;</string>
+    <string name="more_keys_for_tablet_period">!text/more_keys_for_punctuation</string>
 </resources>
diff --git a/tools/make-keyboard-text/res/values-iw/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-iw/donottranslate-more-keys.xml
index 994e35a..e231a39 100644
--- a/tools/make-keyboard-text/res/values-iw/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values-iw/donottranslate-more-keys.xml
@@ -29,6 +29,7 @@
          U+FB29: "﬩" HEBREW LETTER ALTERNATIVE PLUS SIGN -->
     <string name="more_keys_for_plus">&#x00B1;,&#xFB29;</string>
     <string name="more_keys_for_punctuation">"!fixedColumnOrder!8,;,/,(|),)|(,#,!,\\,,\?,&amp;,\\%,+,\",-,:,',\@"</string>
+    <string name="more_keys_for_tablet_punctuation">"!fixedColumnOrder!7,;,/,(|),)|(,#,',\\,,&amp;,\\%,+,\",-,:,\@"</string>
     <!-- The all letters need to be mirrored are found at
          http://www.unicode.org/Public/6.1.0/ucd/BidiMirroring.txt -->
     <string name="more_keys_for_left_parenthesis">!fixedColumnOrder!3,&lt;|&gt;,{|},[|]</string>
@@ -54,8 +55,4 @@
     <string name="double_angle_quotes">!text/double_laqm_raqm_rtl</string>
     <!-- U+20AA: "₪" NEW SHEQEL SIGN -->
     <string name="keylabel_for_currency">&#x20AA;</string>
-    <string name="keyhintlabel_for_tablet_comma">!</string>
-    <string name="more_keys_for_tablet_comma">!</string>
-    <string name="keyhintlabel_for_period">\?</string>
-    <string name="more_keys_for_period">\?</string>
 </resources>
diff --git a/tools/make-keyboard-text/res/values-ka/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-ka-rGE/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-ka/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-ka-rGE/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values-km/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-km-rKH/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-km/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-km-rKH/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values-lo/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-lo-rLA/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-lo/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-lo-rLA/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values-mn/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-mn-rMN/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-mn/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-mn-rMN/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values-ne/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values-ne-rNP/donottranslate-more-keys.xml
similarity index 100%
rename from tools/make-keyboard-text/res/values-ne/donottranslate-more-keys.xml
rename to tools/make-keyboard-text/res/values-ne-rNP/donottranslate-more-keys.xml
diff --git a/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml b/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml
index 3c59b4b..ceb46dc 100644
--- a/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml
+++ b/tools/make-keyboard-text/res/values/donottranslate-more-keys.xml
@@ -63,6 +63,12 @@
     <string name="keylabel_for_south_slavic_row3_8"></string>
     <string name="more_keys_for_cyrillic_ie"></string>
     <string name="more_keys_for_cyrillic_i"></string>
+    <string name="keylabel_for_swiss_row1_11"></string>
+    <string name="keylabel_for_swiss_row2_10"></string>
+    <string name="keylabel_for_swiss_row2_11"></string>
+    <string name="more_keys_for_swiss_row1_11"></string>
+    <string name="more_keys_for_swiss_row2_10"></string>
+    <string name="more_keys_for_swiss_row2_11"></string>
     <!-- Label for "switch to alphabetic" key. -->
     <string name="label_to_alpha_key">ABC</string>
     <string name="single_quotes">!text/single_lqm_rqm</string>
@@ -78,6 +84,7 @@
     <string name="keylabel_for_currency">$</string>
     <string name="more_keys_for_currency">$,&#x00A2;,&#x20AC;,&#x00A3;,&#x00A5;,&#x20B1;</string>
     <string name="more_keys_for_punctuation">"!fixedColumnOrder!8,;,/,(,),#,!,\\,,\?,&amp;,\\%,+,\",-,:,',\@"</string>
+    <string name="more_keys_for_tablet_punctuation">"!fixedColumnOrder!7,;,/,(,),#,',\\,,&amp;,\\%,+,\",-,:,\@"</string>
     <!-- U+2020: "†" DAGGER
          U+2021: "‡" DOUBLE DAGGER
          U+2605: "★" BLACK STAR -->
@@ -103,7 +110,6 @@
     <string name="more_keys_for_less_than">!fixedColumnOrder!3,&#x2039;,&#x2264;,&#x00AB;</string>
     <string name="more_keys_for_greater_than">!fixedColumnOrder!3,&#x203A;,&#x2265;,&#x00BB;</string>
     <string name="more_keys_for_arabic_diacritics"></string>
-    <string name="keyhintlabel_for_arabic_diacritics"></string>
     <string name="keylabel_for_symbols_1">1</string>
     <string name="keylabel_for_symbols_2">2</string>
     <string name="keylabel_for_symbols_3">3</string>
@@ -154,34 +160,37 @@
     <!-- U+207F: "ⁿ" SUPERSCRIPT LATIN SMALL LETTER N
          U+2205: "∅" EMPTY SET -->
     <string name="more_keys_for_symbols_0">&#x207F;,&#x2205;</string>
+    <!-- Comma key -->
     <string name="keylabel_for_comma">,</string>
     <string name="more_keys_for_comma"></string>
+    <string name="keylabel_for_tablet_comma">,</string>
+    <string name="keyhintlabel_for_tablet_comma"></string>
+    <string name="more_keys_for_tablet_comma"></string>
+    <!-- Period key -->
+    <string name="keylabel_for_period">.</string>
+    <string name="keyhintlabel_for_period"></string>
+    <string name="more_keys_for_period">!text/more_keys_for_punctuation</string>
+    <string name="keylabel_for_tablet_period">.</string>
+    <string name="keyhintlabel_for_tablet_period"></string>
+    <string name="more_keys_for_tablet_period">!text/more_keys_for_tablet_punctuation</string>
     <string name="keylabel_for_symbols_question">\?</string>
     <string name="keylabel_for_symbols_semicolon">;</string>
     <string name="keylabel_for_symbols_percent">%</string>
     <!-- U+00A1: "¡" INVERTED EXCLAMATION MARK -->
-    <string name="more_keys_for_symbols_exclamation">&#x00A1;</string>
+    <string name="more_keys_for_exclamation">&#x00A1;</string>
     <!-- U+00BF: "¿" INVERTED QUESTION MARK -->
-    <string name="more_keys_for_symbols_question">&#x00BF;</string>
+    <string name="more_keys_for_question">&#x00BF;</string>
     <string name="more_keys_for_symbols_semicolon"></string>
     <!-- U+2030: "‰" PER MILLE SIGN -->
     <string name="more_keys_for_symbols_percent">&#x2030;</string>
-    <string name="keylabel_for_tablet_comma">,</string>
-    <string name="keyhintlabel_for_tablet_comma"></string>
-    <string name="more_keys_for_tablet_comma"></string>
-    <string name="keyhintlabel_for_period"></string>
-    <!-- U+2026: "…" HORIZONTAL ELLIPSIS -->
-    <string name="more_keys_for_period">&#x2026;</string>
-    <string name="keylabel_for_apostrophe">\'</string>
-    <string name="keyhintlabel_for_apostrophe">\"</string>
-    <string name="more_keys_for_apostrophe">\"</string>
     <string name="more_keys_for_q"></string>
     <string name="more_keys_for_x"></string>
     <string name="keylabel_for_q">q</string>
     <string name="keylabel_for_w">w</string>
     <string name="keylabel_for_y">y</string>
     <string name="keylabel_for_x">x</string>
-    <string name="keylabel_for_spanish_row2_10"></string>
+    <!-- U+00F1: "ñ" LATIN SMALL LETTER N WITH TILDE -->
+    <string name="keylabel_for_spanish_row2_10">&#x00F1;</string>
     <string name="more_keys_for_am_pm">!fixedColumnOrder!2,!hasLabels!,\@string/label_time_am,\@string/label_time_pm</string>
     <string name="settings_as_more_key">!icon/settings_key|!code/key_settings</string>
     <string name="shortcut_as_more_key">!icon/shortcut_key|!code/key_shortcut</string>
diff --git a/tools/make-keyboard-text/src/com/android/inputmethod/keyboard/tools/LocaleUtils.java b/tools/make-keyboard-text/src/com/android/inputmethod/keyboard/tools/LocaleUtils.java
new file mode 100644
index 0000000..9fdc1f6
--- /dev/null
+++ b/tools/make-keyboard-text/src/com/android/inputmethod/keyboard/tools/LocaleUtils.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.keyboard.tools;
+
+import java.util.HashMap;
+import java.util.Locale;
+
+/**
+ * A class to help with handling Locales in string form.
+ *
+ * This is a subset of com/android/inputmethod/latin/utils/LocaleUtils.java in order to use
+ * for the make-keyboard-text tool.
+ */
+public final class LocaleUtils {
+    private LocaleUtils() {
+        // Intentional empty constructor for utility class.
+    }
+
+    private static final HashMap<String, Locale> sLocaleCache = new HashMap<String, Locale>();
+
+    /**
+     * Creates a locale from a string specification.
+     */
+    public static Locale constructLocaleFromString(final String localeStr) {
+        if (localeStr == null) {
+            return null;
+        }
+        synchronized (sLocaleCache) {
+            Locale retval = sLocaleCache.get(localeStr);
+            if (retval != null) {
+                return retval;
+            }
+            String[] localeParams = localeStr.split("_", 3);
+            if (localeParams.length == 1) {
+                retval = new Locale(localeParams[0]);
+            } else if (localeParams.length == 2) {
+                retval = new Locale(localeParams[0], localeParams[1]);
+            } else if (localeParams.length == 3) {
+                retval = new Locale(localeParams[0], localeParams[1], localeParams[2]);
+            }
+            if (retval != null) {
+                sLocaleCache.put(localeStr, retval);
+            }
+            return retval;
+        }
+    }
+}
diff --git a/tools/make-keyboard-text/src/com/android/inputmethod/keyboard/tools/MoreKeysResources.java b/tools/make-keyboard-text/src/com/android/inputmethod/keyboard/tools/MoreKeysResources.java
index 2643e01..a883830 100644
--- a/tools/make-keyboard-text/src/com/android/inputmethod/keyboard/tools/MoreKeysResources.java
+++ b/tools/make-keyboard-text/src/com/android/inputmethod/keyboard/tools/MoreKeysResources.java
@@ -37,7 +37,7 @@
     private static final String MARK_DEFAULT_TEXTS = "@DEFAULT_TEXTS@";
     private static final String MARK_TEXTS = "@TEXTS@";
     private static final String MARK_LANGUAGES_AND_TEXTS = "@LANGUAGES_AND_TEXTS@";
-    private static final String DEFAUT_LANGUAGE_NAME = "DEFAULT";
+    private static final String DEFAULT_LANGUAGE_NAME = "DEFAULT";
     private static final String ARRAY_NAME_FOR_LANGUAGE = "LANGUAGE_%s";
     private static final String EMPTY_STRING_VAR = "EMPTY";
 
@@ -72,7 +72,7 @@
         final int languagePos = dirName.indexOf('-');
         if (languagePos < 0) {
             // Default resource.
-            return DEFAUT_LANGUAGE_NAME;
+            return DEFAULT_LANGUAGE_NAME;
         }
         final String language = dirName.substring(languagePos + 1);
         final int countryPos = language.indexOf("-r");
@@ -84,10 +84,12 @@
 
     public void writeToJava(final String outDir) {
         final ArrayList<String> list = JarUtils.getNameListing(mJar, JAVA_TEMPLATE);
-        if (list.isEmpty())
+        if (list.isEmpty()) {
             throw new RuntimeException("Can't find java template " + JAVA_TEMPLATE);
-        if (list.size() > 1)
+        }
+        if (list.size() > 1) {
             throw new RuntimeException("Found multiple java template " + JAVA_TEMPLATE);
+        }
         final String template = list.get(0);
         final String javaPackage = template.substring(0, template.lastIndexOf('/'));
         PrintStream ps = null;
@@ -131,7 +133,7 @@
     }
 
     private void dumpNames(final PrintStream out) {
-        final StringResourceMap defaultResMap = mResourcesMap.get(DEFAUT_LANGUAGE_NAME);
+        final StringResourceMap defaultResMap = mResourcesMap.get(DEFAULT_LANGUAGE_NAME);
         int id = 0;
         for (final StringResource res : defaultResMap.getResources()) {
             out.format("        /* %2d */ \"%s\",\n", id, res.mName);
@@ -141,17 +143,17 @@
     }
 
     private void dumpDefaultTexts(final PrintStream out) {
-        final StringResourceMap defaultResMap = mResourcesMap.get(DEFAUT_LANGUAGE_NAME);
+        final StringResourceMap defaultResMap = mResourcesMap.get(DEFAULT_LANGUAGE_NAME);
         dumpTextsInternal(out, defaultResMap, defaultResMap);
     }
 
     private void dumpTexts(final PrintStream out) {
-        final StringResourceMap defaultResMap = mResourcesMap.get(DEFAUT_LANGUAGE_NAME);
+        final StringResourceMap defaultResMap = mResourcesMap.get(DEFAULT_LANGUAGE_NAME);
         final ArrayList<String> allLanguages = new ArrayList<String>();
         allLanguages.addAll(mResourcesMap.keySet());
         Collections.sort(allLanguages);
         for (final String language : allLanguages) {
-            if (language.equals(DEFAUT_LANGUAGE_NAME)) {
+            if (language.equals(DEFAULT_LANGUAGE_NAME)) {
                 continue;
             }
             out.format("    /* Language %s: %s */\n", language, getLanguageDisplayName(language));
@@ -174,17 +176,22 @@
         allLanguages.addAll(mResourcesMap.keySet());
         Collections.sort(allLanguages);
         for (final String language : allLanguages) {
-            out.format("        \"%s\", " + ARRAY_NAME_FOR_LANGUAGE + ", /* %s */\n",
-                    language, language, getLanguageDisplayName(language));
+            final Locale locale = LocaleUtils.constructLocaleFromString(language);
+            // If we use a different key, dump the original as comment for now.
+            final String languageKeyToDump = locale.getCountry().isEmpty()
+                    ? String.format("\"%s\"", language)
+                    : String.format("\"%s\" /* \"%s\" */", locale.getLanguage(), language);
+            out.format("        %s, " + ARRAY_NAME_FOR_LANGUAGE + ", /* %s */\n",
+                    languageKeyToDump, language, getLanguageDisplayName(language));
         }
     }
 
     private static String getLanguageDisplayName(final String language) {
-        if (language.equals(NO_LANGUAGE_CODE)) {
+        final Locale locale = LocaleUtils.constructLocaleFromString(language);
+        if (locale.getLanguage().equals(NO_LANGUAGE_CODE)) {
             return NO_LANGUAGE_DISPLAY_NAME;
-        } else {
-            return new Locale(language).getDisplayLanguage();
         }
+        return locale.getDisplayName(Locale.ENGLISH);
     }
 
     private static void dumpTextsInternal(final PrintStream out, final StringResourceMap resMap,