Merge "Employ "bigram link" for handling moved bigram target."
diff --git a/java/res/xml-sw600dp/key_f2.xml b/java/res/xml/key_f2.xml
similarity index 83%
rename from java/res/xml-sw600dp/key_f2.xml
rename to java/res/xml/key_f2.xml
index 674153a..473dd21 100644
--- a/java/res/xml-sw600dp/key_f2.xml
+++ b/java/res/xml/key_f2.xml
@@ -26,11 +26,13 @@
             latin:mode="email|url"
         >
             <Key
-                latin:keyStyle="comKeyStyle" />
+                latin:keyStyle="comKeyStyle"
+                latin:keyWidth="fillRight" />
         </case>
         <default>
             <Key
-                latin:keyStyle="emojiKeyStyle" />
+                latin:keyStyle="emojiKeyStyle"
+                latin:keyWidth="fillRight" />
         </default>
     </switch>
 </merge>
diff --git a/java/res/xml/keyboard_layout_set_armenian_phonetic.xml b/java/res/xml/keyboard_layout_set_armenian_phonetic.xml
index b374fae..35bd43f 100644
--- a/java/res/xml/keyboard_layout_set_armenian_phonetic.xml
+++ b/java/res/xml/keyboard_layout_set_armenian_phonetic.xml
@@ -28,6 +28,9 @@
         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
diff --git a/java/res/xml/row_symbols_shift4.xml b/java/res/xml/row_symbols_shift4.xml
index 57a2ec0..72d24a3 100644
--- a/java/res/xml/row_symbols_shift4.xml
+++ b/java/res/xml/row_symbols_shift4.xml
@@ -24,8 +24,7 @@
         latin:keyboardLayout="@xml/key_space_symbols" />
     <include latin:keyboardLayout="@xml/keys_comma_period" />
 
-    <Key
-        latin:keyStyle="enterKeyStyle"
-        latin:keyWidth="fillRight" />
+    <include
+        latin:keyboardLayout="@xml/key_f2" />
 
 </merge>
diff --git a/java/res/xml/rowkeys_nepali_traditional2.xml b/java/res/xml/rowkeys_nepali_traditional2.xml
index 2c53b3b..45620a9 100644
--- a/java/res/xml/rowkeys_nepali_traditional2.xml
+++ b/java/res/xml/rowkeys_nepali_traditional2.xml
@@ -29,13 +29,13 @@
             <Key
                 latin:keyLabel="&#x0906;"
                 latin:keyLabelFlags="fontNormal" />
-            <!-- U+0919/U+094D/U+0915: "ङ्क" DEVANAGARI LETTER NGA/DEVANAGARI SIGN VIRAMA/DEVANAGARI LETTER KA -->
+            <!-- U+0919/U+094D: "ङ्" DEVANAGARI LETTER NGA/DEVANAGARI SIGN VIRAMA -->
             <Key
-                latin:keyLabel="&#x0919;&#x094D;&#x0915;"
+                latin:keyLabel="&#x0919;&#x094D;"
                 latin:keyLabelFlags="fontNormal|followKeyLetterRatio" />
-            <!-- U+0919/U+094D/U+0917: "ङ्ग" DEVANAGARI LETTER NGA/DEVANAGARI SIGN VIRAMA/DEVANAGARI LETTER GA -->
+            <!-- U+0921/U+094D/U+0921: "ड्ड" DEVANAGARI LETTER DDA/DEVANAGARI SIGN VIRAMA/DEVANAGARI LETTER DDA -->
             <Key
-                latin:keyLabel="&#x0919;&#x094D;&#x0917;"
+                latin:keyLabel="&#x0921;&#x094D;&#x0921;"
                 latin:keyLabelFlags="fontNormal|followKeyLetterRatio" />
             <!-- Because the font rendering system prior to API version 16 can't automatically
                  render dotted circle for incomplete combining letter of some scripts, different
diff --git a/java/res/xml/rowkeys_nepali_traditional3_left6.xml b/java/res/xml/rowkeys_nepali_traditional3_left6.xml
index d4388e0..1cacced 100644
--- a/java/res/xml/rowkeys_nepali_traditional3_left6.xml
+++ b/java/res/xml/rowkeys_nepali_traditional3_left6.xml
@@ -25,9 +25,9 @@
         <case
             latin:keyboardLayoutSetElement="alphabetManualShifted|alphabetShiftLocked|alphabetShiftLockShifted"
         >
-            <!-- U+0915/U+094D/U+0915: "क्क" DEVANAGARI LETTER KA/DEVANAGARI SIGN VIRAMA/DEVANAGARI LETTER KA -->
+            <!-- U+0915/U+094D: "क्" DEVANAGARI LETTER KA/DEVANAGARI SIGN VIRAMA -->
             <Key
-                latin:keyLabel="&#x0915;&#x094D;&#x0915;"
+                latin:keyLabel="&#x0915;&#x094D;"
                 latin:keyLabelFlags="fontNormal|followKeyLetterRatio" />
             <!-- U+0939/U+094D/U+092E: "ह्म" DEVANAGARI LETTER HA/DEVANAGARI SIGN VIRAMA/DEVANAGARI LETTER MA -->
             <Key
diff --git a/java/src/com/android/inputmethod/keyboard/EmojiKeyboardView.java b/java/src/com/android/inputmethod/keyboard/EmojiKeyboardView.java
index 437ba18..9996a6d 100644
--- a/java/src/com/android/inputmethod/keyboard/EmojiKeyboardView.java
+++ b/java/src/com/android/inputmethod/keyboard/EmojiKeyboardView.java
@@ -37,7 +37,7 @@
 import android.widget.TabHost.OnTabChangeListener;
 import android.widget.TextView;
 
-import com.android.inputmethod.keyboard.internal.RecentsKeyboard;
+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.latin.Constants;
@@ -125,7 +125,7 @@
                 mShownCategories.add(CATEGORY_NATURE);
                 mShownCategories.add(CATEGORY_PLACES);
                 // TODO: Restore last saved category
-                mCurrentCategory = CATEGORY_PLACES;
+                mCurrentCategory = CATEGORY_PEOPLE;
             } else {
                 // TODO: Restore last saved category
                 mCurrentCategory = CATEGORY_SYMBOLS;
@@ -156,7 +156,7 @@
 
         public int getCurrentCategory() {
             // TODO: Record current category.
-            return CATEGORY_PEOPLE;
+            return mCurrentCategory;
         }
 
         public void setCurrentCategory(int category) {
@@ -376,7 +376,7 @@
     private static class EmojiKeyboardAdapter extends PagerAdapter {
         private final ScrollKeyboardView.OnKeyClickListener mListener;
         private final KeyboardLayoutSet mLayoutSet;
-        private final RecentsKeyboard mRecentsKeyboard;
+        private final DynamicGridKeyboard mRecentsKeyboard;
         private final SparseArray<ScrollKeyboardView> mActiveKeyboardView =
                 CollectionUtils.newSparseArray();
         private final EmojiCategory mEmojiCategory;
@@ -388,7 +388,7 @@
             mEmojiCategory = emojiCategory;
             mListener = listener;
             mLayoutSet = layoutSet;
-            mRecentsKeyboard = new RecentsKeyboard(
+            mRecentsKeyboard = new DynamicGridKeyboard(
                     layoutSet.getKeyboard(KeyboardId.ELEMENT_EMOJI_RECENTS));
         }
 
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
index d128d35..cc1ffd1 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardSwitcher.java
@@ -314,15 +314,19 @@
         mState.onCodeInput(code, mLatinIME.getCurrentAutoCapsState());
     }
 
+    public boolean isShowingEmojiKeyboard() {
+        return mEmojiKeyboardView.getVisibility() == View.VISIBLE;
+    }
+
     public boolean isShowingMoreKeysPanel() {
-        if (mEmojiKeyboardView.getVisibility() == View.VISIBLE) {
+        if (isShowingEmojiKeyboard()) {
             return false;
         }
         return mKeyboardView.isShowingMoreKeysPanel();
     }
 
     public View getVisibleKeyboardView() {
-        if (mEmojiKeyboardView.getVisibility() == View.VISIBLE) {
+        if (isShowingEmojiKeyboard()) {
             return mEmojiKeyboardView;
         }
         return mKeyboardView;
diff --git a/java/src/com/android/inputmethod/keyboard/internal/RecentsKeyboard.java b/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
similarity index 95%
rename from java/src/com/android/inputmethod/keyboard/internal/RecentsKeyboard.java
rename to java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
index 629c604..a226891 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/RecentsKeyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/DynamicGridKeyboard.java
@@ -26,10 +26,10 @@
 import java.util.Random;
 
 /**
- * This is a Keyboard class to host recently used keys.
+ * This is a Keyboard class where you can add keys dynamically shown in a grid layout
  */
 // TODO: Save/restore recent keys from/to preferences.
-public class RecentsKeyboard extends Keyboard {
+public class DynamicGridKeyboard extends Keyboard {
     private static final int TEMPLATE_KEY_CODE_0 = 0x30;
     private static final int TEMPLATE_KEY_CODE_1 = 0x31;
 
@@ -42,7 +42,7 @@
 
     private Key[] mCachedRecentKeys;
 
-    public RecentsKeyboard(final Keyboard templateKeyboard) {
+    public DynamicGridKeyboard(final Keyboard templateKeyboard) {
         super(templateKeyboard);
         final Key key0 = getTemplateKey(TEMPLATE_KEY_CODE_0);
         final Key key1 = getTemplateKey(TEMPLATE_KEY_CODE_1);
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index c884e7b..2a90764 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -617,4 +617,14 @@
         });
         return holder.get(false, TIMEOUT_FOR_READ_OPS_IN_MILLISECONDS);
     }
+
+    @UsedForTesting
+    public void shutdownExecutorForTests() {
+        getExecutor(mFilename).shutdown();
+    }
+
+    @UsedForTesting
+    public boolean isTerminatedForTests() {
+        return getExecutor(mFilename).isTerminated();
+    }
 }
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index cdd6c92..5657ed7 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -1234,7 +1234,10 @@
         int visibleTopY = extraHeight;
         // Need to set touchable region only if input view is being shown
         if (visibleKeyboardView.isShown()) {
-            if (mSuggestionStripView.getVisibility() == View.VISIBLE) {
+            // Note that the height of Emoji layout is the same as the height of the main keyboard
+            // and the suggestion strip
+            if (mKeyboardSwitcher.isShowingEmojiKeyboard()
+                    || mSuggestionStripView.getVisibility() == View.VISIBLE) {
                 visibleTopY -= suggestionsHeight;
             }
             final int touchY = mKeyboardSwitcher.isShowingMoreKeysPanel() ? 0 : visibleTopY;
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
index 21e9811..f333b0d 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictEncoderUtils.java
@@ -126,8 +126,14 @@
      */
     private static int getPtNodeMaximumSize(final PtNode ptNode, final FormatOptions options) {
         int size = getNodeHeaderSize(ptNode, options);
-        // If terminal, one byte for the frequency
-        if (ptNode.isTerminal()) size += FormatSpec.PTNODE_FREQUENCY_SIZE;
+        if (ptNode.isTerminal()) {
+            // If terminal, one byte for the frequency or four bytes for the terminal id.
+            if (options.mHasTerminalId) {
+                size += FormatSpec.PTNODE_TERMINAL_ID_SIZE;
+            } else {
+                size += FormatSpec.PTNODE_FREQUENCY_SIZE;
+            }
+        }
         size += FormatSpec.PTNODE_MAX_ADDRESS_SIZE; // For children address
         size += getShortcutListSize(ptNode.mShortcutTargets);
         if (null != ptNode.mBigrams) {
@@ -345,7 +351,13 @@
                 changed = true;
             }
             int nodeSize = getNodeHeaderSize(ptNode, formatOptions);
-            if (ptNode.isTerminal()) nodeSize += FormatSpec.PTNODE_FREQUENCY_SIZE;
+            if (ptNode.isTerminal()) {
+                if (formatOptions.mHasTerminalId) {
+                    nodeSize += FormatSpec.PTNODE_TERMINAL_ID_SIZE;
+                } else {
+                    nodeSize += FormatSpec.PTNODE_FREQUENCY_SIZE;
+                }
+            }
             if (formatOptions.mSupportsDynamicUpdate) {
                 nodeSize += FormatSpec.SIGNED_CHILDREN_ADDRESS_SIZE;
             } else if (null != ptNode.mChildren) {
@@ -787,7 +799,6 @@
                         + FormatSpec.MAX_TERMINAL_FREQUENCY
                         + " : " + ptNode.mFrequency);
             }
-
             dictEncoder.writePtNode(ptNode, parentPosition, formatOptions, dict);
         }
         if (formatOptions.mSupportsDynamicUpdate) {
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index 44ae33d..96ccd8e 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -198,9 +198,12 @@
 
     public static final int MAGIC_NUMBER = 0x9BC13AFE;
     static final int MINIMUM_SUPPORTED_VERSION = 2;
-    static final int MAXIMUM_SUPPORTED_VERSION = 3;
+    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 options need to be the same numeric values as the one in the native reading code.
     static final int GERMAN_UMLAUT_PROCESSING_FLAG = 0x1;
@@ -251,11 +254,17 @@
     static final int PTNODE_TERMINATOR_SIZE = 1;
     static final int PTNODE_FLAGS_SIZE = 1;
     static final int PTNODE_FREQUENCY_SIZE = 1;
+    static final int PTNODE_TERMINAL_ID_SIZE = 4;
     static final int PTNODE_MAX_ADDRESS_SIZE = 3;
     static final int PTNODE_ATTRIBUTE_FLAGS_SIZE = 1;
     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.
+    static final String TRIE_FILE_EXTENSION = ".trie";
+    static final String FREQ_FILE_EXTENSION = ".freq";
+    static final int FREQUENCY_AND_FLAGS_SIZE = 2;
+
     static final int NO_CHILDREN_ADDRESS = Integer.MIN_VALUE;
     static final int NO_PARENT_ADDRESS = 0;
     static final int NO_FORWARD_LINK_ADDRESS = 0;
@@ -264,6 +273,7 @@
     static final int MAX_PTNODES_FOR_ONE_BYTE_PTNODE_COUNT = 0x7F; // 127
     static final int MAX_PTNODES_IN_A_PT_NODE_ARRAY = 0x7FFF; // 32767
     static final int MAX_BIGRAMS_IN_A_PTNODE = 10000;
+    static final int MAX_SHORTCUT_LIST_SIZE_IN_A_PTNODE = 0xFFFF;
 
     static final int MAX_TERMINAL_FREQUENCY = 255;
     static final int MAX_BIGRAM_FREQUENCY = 15;
@@ -287,6 +297,7 @@
     public static final class FormatOptions {
         public final int mVersion;
         public final boolean mSupportsDynamicUpdate;
+        public final boolean mHasTerminalId;
         @UsedForTesting
         public FormatOptions(final int version) {
             this(version, false);
@@ -300,6 +311,7 @@
                         + FIRST_VERSION_WITH_DYNAMIC_UPDATE + " and ulterior.");
             }
             mSupportsDynamicUpdate = supportsDynamicUpdate;
+            mHasTerminalId = (version >= FIRST_VERSION_WITH_TERMINAL_ID);
         }
     }
 
diff --git a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
index 3e685a3..be653fe 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
@@ -111,6 +111,7 @@
         ArrayList<WeightedString> mShortcutTargets;
         ArrayList<WeightedString> mBigrams;
         int mFrequency; // NOT_A_TERMINAL == mFrequency indicates this is not a terminal.
+        int mTerminalId; // NOT_A_TERMINAL == mTerminalId indicates this is not a terminal.
         PtNodeArray mChildren;
         boolean mIsNotAWord; // Only a shortcut
         boolean mIsBlacklistEntry;
@@ -129,6 +130,7 @@
                 final boolean isNotAWord, final boolean isBlacklistEntry) {
             mChars = chars;
             mFrequency = frequency;
+            mTerminalId = frequency;
             mShortcutTargets = shortcutTargets;
             mBigrams = bigrams;
             mChildren = null;
@@ -156,6 +158,10 @@
             mChildren.mData.add(n);
         }
 
+        public int getTerminalId() {
+            return mTerminalId;
+        }
+
         public boolean isTerminal() {
             return NOT_A_TERMINAL != mFrequency;
         }
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
index 48a823d..222a0f4 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
@@ -68,7 +68,7 @@
     @Override
     public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
             throws IOException, UnsupportedFormatException {
-        if (formatOptions.mVersion > 3) {
+        if (formatOptions.mVersion > FormatSpec.VERSION3) {
             throw new UnsupportedFormatException(
                     "The given format options has wrong version number : "
                     + formatOptions.mVersion);
@@ -200,7 +200,7 @@
             mPosition += shortcutShift;
         }
         final int shortcutByteSize = mPosition - indexOfShortcutByteSize;
-        if (shortcutByteSize > 0xFFFF) {
+        if (shortcutByteSize > FormatSpec.MAX_SHORTCUT_LIST_SIZE_IN_A_PTNODE) {
             throw new RuntimeException("Shortcut list too large");
         }
         BinaryDictEncoderUtils.writeUIntToBuffer(mBuffer, indexOfShortcutByteSize, shortcutByteSize,
diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
new file mode 100644
index 0000000..75b75ae
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver4DictEncoder.java
@@ -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.
+ */
+
+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.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 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.
+ */
+@UsedForTesting
+public class Ver4DictEncoder implements DictEncoder {
+    private final File mDictPlacedDir;
+    private byte[] mTrieBuf;
+    private byte[] mFreqBuf;
+    private int mTriePos;
+    private OutputStream mTrieOutStream;
+    private OutputStream mFreqOutStream;
+
+    @UsedForTesting
+    public Ver4DictEncoder(final File dictPlacedDir) {
+        mDictPlacedDir = dictPlacedDir;
+    }
+
+    private void openStreams(final FormatOptions formatOptions, final DictionaryOptions dictOptions)
+            throws FileNotFoundException, IOException {
+        final FileHeader header = new FileHeader(0, dictOptions, formatOptions);
+        final String filename = header.getId() + "." + header.getVersion();
+        final File mDictDir = new File(mDictPlacedDir, filename);
+        final File trieFile = new File(mDictDir, filename + FormatSpec.TRIE_FILE_EXTENSION);
+        final File freqFile = new File(mDictDir, filename + FormatSpec.FREQ_FILE_EXTENSION);
+        if (!mDictDir.isDirectory()) {
+            if (mDictDir.exists()) mDictDir.delete();
+            mDictDir.mkdirs();
+        }
+        if (!trieFile.exists()) trieFile.createNewFile();
+        if (!freqFile.exists()) freqFile.createNewFile();
+        mTrieOutStream = new FileOutputStream(trieFile);
+        mFreqOutStream = new FileOutputStream(freqFile);
+    }
+
+    private void close() throws IOException {
+        try {
+            if (mTrieOutStream != null) {
+                mTrieOutStream.close();
+            }
+            if (mFreqOutStream != null) {
+                mFreqOutStream.close();
+            }
+        } finally {
+            mTrieOutStream = null;
+            mFreqOutStream = null;
+        }
+    }
+
+    @Override
+    public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
+            throws IOException, UnsupportedFormatException {
+        if (formatOptions.mVersion != FormatSpec.VERSION4) {
+            throw new UnsupportedFormatException("File header has a wrong version number : "
+                    + formatOptions.mVersion);
+        }
+        if (!mDictPlacedDir.isDirectory()) {
+            throw new UnsupportedFormatException("Given path is not a directory.");
+        }
+
+        if (mTrieOutStream == null) {
+            openStreams(formatOptions, dict.mOptions);
+        }
+
+        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++;
+            }
+        }
+
+        MakedictLog.i("Computing addresses...");
+        BinaryDictEncoderUtils.computeAddresses(dict, flatNodes, formatOptions);
+        if (MakedictLog.DBG) BinaryDictEncoderUtils.checkFlatPtNodeArrayList(flatNodes);
+
+        final PtNodeArray lastNodeArray = flatNodes.get(flatNodes.size() - 1);
+        final int bufferSize = lastNodeArray.mCachedAddressAfterUpdate + lastNodeArray.mCachedSize;
+        mTrieBuf = new byte[bufferSize];
+        mFreqBuf = new byte[terminalCount * FormatSpec.FREQUENCY_AND_FLAGS_SIZE];
+
+        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);
+        mFreqOutStream.write(mFreqBuf);
+
+        MakedictLog.i("Done");
+        close();
+    }
+
+    @Override
+    public void setPosition(int position) {
+        if (mTrieBuf == null || position < 0 || position >- mTrieBuf.length) return;
+        mTriePos = position;
+    }
+
+    @Override
+    public int getPosition() {
+        return mTriePos;
+    }
+
+    @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);
+        }
+        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos, ptNodeCount,
+                countSize);
+    }
+
+    private void writePtNodeFlags(final PtNode ptNode, final int parentAddress,
+            final FormatOptions formatOptions) {
+        final int childrenPos = BinaryDictEncoderUtils.getChildrenPosition(ptNode, formatOptions);
+        mTriePos = BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, mTriePos,
+                BinaryDictEncoderUtils.makePtNodeFlags(ptNode, mTriePos, 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 writeFrequency(final int frequency, final int terminalId) {
+        final int freqPos = terminalId * FormatSpec.FREQUENCY_AND_FLAGS_SIZE;
+        BinaryDictEncoderUtils.writeUIntToBuffer(mFreqBuf, freqPos, frequency,
+                FormatSpec.FREQUENCY_AND_FLAGS_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 writeShortcuts(ArrayList<WeightedString> shortcuts) {
+        if (null == shortcuts || shortcuts.isEmpty()) return;
+
+        final int indexOfShortcutByteSize = mTriePos;
+        mTriePos += FormatSpec.PTNODE_SHORTCUT_LIST_SIZE_SIZE;
+        final Iterator<WeightedString> shortcutIterator = shortcuts.iterator();
+        while (shortcutIterator.hasNext()) {
+            final WeightedString target = shortcutIterator.next();
+            final int shortcutFlags = BinaryDictEncoderUtils.makeShortcutFlags(
+                    shortcutIterator.hasNext(),
+                    target.mFrequency);
+            mTrieBuf[mTriePos++] = (byte)shortcutFlags;
+            final int shortcutShift = CharEncoding.writeString(mTrieBuf, mTriePos,
+                    target.mWord);
+            mTriePos += shortcutShift;
+        }
+        final int shortcutByteSize = mTriePos - indexOfShortcutByteSize;
+        if (shortcutByteSize > FormatSpec.MAX_SHORTCUT_LIST_SIZE_IN_A_PTNODE) {
+            throw new RuntimeException("Shortcut list too large : " + shortcutByteSize);
+        }
+        BinaryDictEncoderUtils.writeUIntToBuffer(mTrieBuf, indexOfShortcutByteSize,
+                shortcutByteSize, FormatSpec.PTNODE_SHORTCUT_LIST_SIZE_SIZE);
+    }
+
+    private void writeBigrams(ArrayList<WeightedString> bigrams, FusionDictionary dict) {
+        if (bigrams == null) return;
+
+        final Iterator<WeightedString> bigramIterator = bigrams.iterator();
+        while (bigramIterator.hasNext()) {
+            final WeightedString bigram = bigramIterator.next();
+            final PtNode target =
+                    FusionDictionary.findWordInTree(dict.mRootNodeArray, bigram.mWord);
+            final int addressOfBigram = target.mCachedAddressAfterUpdate;
+            final int unigramFrequencyForThisWord = target.mFrequency;
+            final int offset = addressOfBigram
+                    - (mTriePos + FormatSpec.PTNODE_ATTRIBUTE_FLAGS_SIZE);
+            int bigramFlags = BinaryDictEncoderUtils.makeBigramFlags(bigramIterator.hasNext(),
+                    offset, bigram.mFrequency, unigramFrequencyForThisWord, bigram.mWord);
+            mTrieBuf[mTriePos++] = (byte) bigramFlags;
+            mTriePos += BinaryDictEncoderUtils.writeChildrenPosition(mTrieBuf,
+                    mTriePos, Math.abs(offset));
+        }
+    }
+
+    @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, parentPosition, formatOptions);
+        writeParentPosition(parentPosition, ptNode, formatOptions);
+        writeCharacters(ptNode.mChars, ptNode.hasSeveralChars());
+        if (ptNode.isTerminal()) {
+            writeTerminalId(ptNode.mTerminalId);
+            writeFrequency(ptNode.mFrequency, ptNode.mTerminalId);
+        }
+        writeChildrenPosition(ptNode, formatOptions);
+        writeShortcuts(ptNode.mShortcutTargets);
+        writeBigrams(ptNode.mBigrams, dict);
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java b/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
index 3c1db65..5dc0b58 100644
--- a/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
+++ b/java/src/com/android/inputmethod/latin/utils/PrioritizedSerialExecutor.java
@@ -31,6 +31,7 @@
     private static final int TASK_QUEUE_CAPACITY = 1000;
     private final Queue<Runnable> mTasks;
     private final Queue<Runnable> mPrioritizedTasks;
+    private boolean mIsShutdown;
 
     // The task which is running now.
     private Runnable mActive;
@@ -38,6 +39,7 @@
     public PrioritizedSerialExecutor() {
         mTasks = new ArrayDeque<Runnable>(TASK_QUEUE_CAPACITY);
         mPrioritizedTasks = new ArrayDeque<Runnable>(TASK_QUEUE_CAPACITY);
+        mIsShutdown = false;
     }
 
     /**
@@ -56,9 +58,11 @@
      */
     public void execute(final Runnable r) {
         synchronized(mLock) {
-            mTasks.offer(r);
-            if (mActive == null) {
-                scheduleNext();
+            if (!mIsShutdown) {
+                mTasks.offer(r);
+                if (mActive == null) {
+                    scheduleNext();
+                }
             }
         }
     }
@@ -69,9 +73,11 @@
      */
     public void executePrioritized(final Runnable r) {
         synchronized(mLock) {
-            mPrioritizedTasks.offer(r);
-            if (mActive ==  null) {
-                scheduleNext();
+            if (!mIsShutdown) {
+                mPrioritizedTasks.offer(r);
+                if (mActive ==  null) {
+                    scheduleNext();
+                }
             }
         }
     }
@@ -123,4 +129,19 @@
             execute(newTask);
         }
     }
+
+    public void shutdown() {
+        synchronized(mLock) {
+            mIsShutdown = true;
+        }
+    }
+
+    public boolean isTerminated() {
+        synchronized(mLock) {
+            if (!mIsShutdown) {
+                return false;
+            }
+            return mPrioritizedTasks.isEmpty() && mTasks.isEmpty() && mActive == null;
+        }
+    }
 }
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
index c2bc2d8..56ef60a 100644
--- 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
@@ -58,7 +58,7 @@
         mChildrenPosFieldPos += mBuffer->getOriginalBufferSize();
     }
     mChildrenPos = DynamicPatriciaTrieReadingUtils::readChildrenPositionAndAdvancePosition(
-            dictBuf, mFlags, &pos);
+            dictBuf, &pos);
     if (usesAdditionalBuffer && mChildrenPos != NOT_A_DICT_POS) {
         mChildrenPos += mBuffer->getOriginalBufferSize();
     }
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp
index 5d979fa..c7e89ff 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.cpp
@@ -29,18 +29,14 @@
 const DptReadingUtils::NodeFlags DptReadingUtils::FLAG_IS_DELETED = 0x80;
 
 /* static */ int DptReadingUtils::readChildrenPositionAndAdvancePosition(
-        const uint8_t *const buffer, const NodeFlags flags, int *const pos) {
-    if ((flags & MASK_MOVED) == FLAG_IS_NOT_MOVED) {
-        const int base = *pos;
-        const int offset = ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
-        if (offset == 0) {
-            // 0 offset means that the node does not have children.
-            return NOT_A_DICT_POS;
-        } else {
-            return base + offset;
-        }
-    } else {
+        const uint8_t *const buffer, int *const pos) {
+    const int base = *pos;
+    const int offset = ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
+    if (offset == 0) {
+        // 0 offset means that the node does not have children.
         return NOT_A_DICT_POS;
+    } else {
+        return base + offset;
     }
 }
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h
index 2e604a2..5a2ad9c 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h
@@ -42,8 +42,7 @@
         return ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
     }
 
-    static int readChildrenPositionAndAdvancePosition(const uint8_t *const buffer,
-            const NodeFlags flags, int *const pos);
+    static int readChildrenPositionAndAdvancePosition(const uint8_t *const buffer, int *const pos);
 
     /**
      * Node Flags
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 f727ecf..6bafb64 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
@@ -172,6 +172,7 @@
         int codePoint = readCodePointAndAdvancePosition(buffer, pos);
         while (NOT_A_CODE_POINT != codePoint && length < maxLength) {
             codePoint = readCodePointAndAdvancePosition(buffer, pos);
+            length++;
         }
         return length;
     }
diff --git a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
index 2d57100..807c252 100644
--- a/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
+++ b/tests/src/com/android/inputmethod/latin/makedict/BinaryDictDecoderEncoderTests.java
@@ -25,6 +25,7 @@
 import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.CharEncoding;
 import com.android.inputmethod.latin.makedict.BinaryDictDecoderUtils.DictBuffer;
 import com.android.inputmethod.latin.makedict.FormatSpec.FileHeader;
+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;
@@ -264,6 +265,27 @@
         return result + ", supportsDynamicUpdate = " + formatOptions.mSupportsDynamicUpdate;
     }
 
+    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;
+    }
+
     // Tests for readDictionaryBinary and writeDictionaryBinary
 
     private long timeReadingAndCheckDict(final File file, final List<String> words,
@@ -292,17 +314,13 @@
             final SparseArray<List<Integer>> bigrams, final HashMap<String, List<String>> shortcuts,
             final int bufferType, final FormatSpec.FormatOptions formatOptions,
             final String message) {
-        File file = null;
-        try {
-            file = File.createTempFile("runReadAndWrite", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-            Log.e(TAG, "IOException", e);
-        }
-        assertNotNull(file);
+
+        final String dictName = "runReadAndWrite";
+        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));
+                getDictionaryOptions(dictName, dictVersion));
         addUnigrams(words.size(), dict, words, shortcuts);
         addBigrams(dict, words, bigrams);
         checkDictionary(dict, words, bigrams, shortcuts);
@@ -454,19 +472,13 @@
     private String runReadUnigramsAndBigramsBinary(final ArrayList<String> words,
             final SparseArray<List<Integer>> bigrams, final int bufferType,
             final FormatSpec.FormatOptions formatOptions, final String message) {
-        File file = null;
-        try {
-            file = File.createTempFile("runReadUnigrams", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-            Log.e(TAG, "IOException", e);
-        }
-        assertNotNull(file);
+        final String dictName = "runReadUnigrams";
+        final String dictVersion = Long.toString(System.currentTimeMillis());
+        final File file = setUpDictionaryFile(dictName, dictVersion);
 
         // making the dictionary from lists of words.
         final FusionDictionary dict = new FusionDictionary(new PtNodeArray(),
-                new FusionDictionary.DictionaryOptions(
-                        new HashMap<String, String>(), false, false));
+                getDictionaryOptions(dictName, dictVersion));
         addUnigrams(words.size(), dict, words, null /* shortcutMap */);
         addBigrams(dict, words, bigrams);
 
@@ -552,18 +564,12 @@
     }
 
     public void testGetTerminalPosition() {
-        File file = null;
-        try {
-            file = File.createTempFile("testGetTerminalPosition", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-            // do nothing
-        }
-        assertNotNull(file);
+        final String dictName = "testGetTerminalPosition";
+        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));
+                getDictionaryOptions(dictName, dictVersion));
         addUnigrams(sWords.size(), dict, sWords, null /* shortcutMap */);
         timeWritingDictToFile(file, dict, VERSION3_WITH_DYNAMIC_UPDATE);
 
@@ -609,14 +615,9 @@
     }
 
     public void testDeleteWord() {
-        File file = null;
-        try {
-            file = File.createTempFile("testDeleteWord", TEST_DICT_FILE_EXTENSION,
-                    getContext().getCacheDir());
-        } catch (IOException e) {
-            // do nothing
-        }
-        assertNotNull(file);
+        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(
diff --git a/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
index d15e88b..bf44a14 100644
--- a/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
@@ -46,6 +46,7 @@
     };
 
     private static final int MIN_USER_HISTORY_DICTIONARY_FILE_SIZE = 1000;
+    private static final int WAIT_TERMINATING_IN_MILLISECONDS = 100;
 
     @Override
     public void setUp() {
@@ -122,8 +123,14 @@
                     true /* checksContents */);
         } finally {
             try {
+                final UserHistoryPredictionDictionary dict =
+                        PersonalizationHelper.getUserHistoryPredictionDictionary(getContext(),
+                                testFilenameSuffix, mPrefs);
                 Log.d(TAG, "waiting for writing ...");
-                Thread.sleep(TimeUnit.MILLISECONDS.convert(5L, TimeUnit.SECONDS));
+                dict.shutdownExecutorForTests();
+                while (!dict.isTerminatedForTests()) {
+                    Thread.sleep(WAIT_TERMINATING_IN_MILLISECONDS);
+                }
             } catch (InterruptedException e) {
                 Log.d(TAG, "InterruptedException: " + e);
             }
@@ -146,11 +153,11 @@
         final int numberOfWordsInsertedForEachLanguageSwitch = 100;
 
         final File dictFiles[] = new File[numberOfLanguages];
+        final String testFilenameSuffixes[] = new String[numberOfLanguages];
         try {
             final Random random = new Random(123456);
 
             // Create filename suffixes for this test.
-            String testFilenameSuffixes[] = new String[numberOfLanguages];
             for (int i = 0; i < numberOfLanguages; i++) {
                 testFilenameSuffixes[i] = "testSwitchingLanguages" + i;
                 final String fileName = UserHistoryPredictionDictionary.NAME + "." +
@@ -174,7 +181,15 @@
         } finally {
             try {
                 Log.d(TAG, "waiting for writing ...");
-                Thread.sleep(TimeUnit.MILLISECONDS.convert(5L, TimeUnit.SECONDS));
+                for (int i = 0; i < numberOfLanguages; i++) {
+                    final UserHistoryPredictionDictionary dict =
+                            PersonalizationHelper.getUserHistoryPredictionDictionary(getContext(),
+                                    testFilenameSuffixes[i], mPrefs);
+                    dict.shutdownExecutorForTests();
+                    while (!dict.isTerminatedForTests()) {
+                        Thread.sleep(WAIT_TERMINATING_IN_MILLISECONDS);
+                    }
+                }
             } catch (InterruptedException e) {
                 Log.d(TAG, "InterruptedException: " + e);
             }