diff --git a/java/res/anim/alt_code_key_while_typing_fadein.xml b/java/res/anim/alt_code_key_while_typing_fadein.xml
new file mode 100644
index 0000000..3f5fd5d
--- /dev/null
+++ b/java/res/anim/alt_code_key_while_typing_fadein.xml
@@ -0,0 +1,26 @@
+<?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.
+*/
+-->
+
+<animator
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:valueType="intType"
+    android:duration="100"
+    android:valueFrom="128"
+    android:valueTo="255" />
diff --git a/java/res/anim/alt_code_key_while_typing_fadeout.xml b/java/res/anim/alt_code_key_while_typing_fadeout.xml
new file mode 100644
index 0000000..88deb31
--- /dev/null
+++ b/java/res/anim/alt_code_key_while_typing_fadeout.xml
@@ -0,0 +1,26 @@
+<?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.
+*/
+-->
+
+<animator
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:valueType="intType"
+    android:duration="400"
+    android:valueFrom="255"
+    android:valueTo="128" />
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index e56778a..e619ad0 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -134,6 +134,9 @@
         <attr name="spacebarTextShadowColor" format="color" />
         <!-- Fadeout animator for spacebar language label. -->
         <attr name="languageOnSpacebarFadeoutAnimator" format="reference" />
+        <!-- Fadeout and fadein animator for altCodeWhileTyping keys. -->
+        <attr name="altCodeKeyWhileTypingFadeoutAnimator" format="reference" />
+        <attr name="altCodeKeyWhileTypingFadeinAnimator" format="reference" />
         <!-- Key detection hysteresis distance. -->
         <attr name="keyHysteresisDistance" format="dimension" />
         <!-- Touch noise threshold time in millisecond -->
@@ -153,7 +156,7 @@
         <!-- Long press timeout of space key in millisecond. -->
         <attr name="longPressSpaceKeyTimeout" format="integer" />
         <!-- Ignore special key timeout while typing in millisecond. -->
-        <attr name="ignoreSpecialKeyTimeout" format="integer" />
+        <attr name="ignoreAltCodeKeyTimeout" format="integer" />
         <!-- More keys keyboard will shown at touched point. -->
         <attr name="showMoreKeysKeyboardAtTouchedPoint" format="boolean" />
     </declare-styleable>
diff --git a/java/res/values/config.xml b/java/res/values/config.xml
index a02b84f..c51800f 100644
--- a/java/res/values/config.xml
+++ b/java/res/values/config.xml
@@ -65,7 +65,7 @@
     <!-- Long pressing space will invoke IME switcher if > 0, never invoke IME switcher if == 0 -->
     <integer name="config_long_press_space_key_timeout">
             @integer/config_long_press_key_timeout</integer>
-    <integer name="config_ignore_special_key_timeout">700</integer>
+    <integer name="config_ignore_alt_code_key_timeout">700</integer>
     <!-- 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>
diff --git a/java/res/values/styles.xml b/java/res/values/styles.xml
index 741ad99..7d8b7dd 100644
--- a/java/res/values/styles.xml
+++ b/java/res/values/styles.xml
@@ -76,9 +76,11 @@
         <item name="longPressKeyTimeout">@integer/config_long_press_key_timeout</item>
         <item name="longPressShiftKeyTimeout">@integer/config_long_press_shift_key_timeout</item>
         <item name="longPressSpaceKeyTimeout">@integer/config_long_press_space_key_timeout</item>
-        <item name="ignoreSpecialKeyTimeout">@integer/config_ignore_special_key_timeout</item>
+        <item name="ignoreAltCodeKeyTimeout">@integer/config_ignore_alt_code_key_timeout</item>
         <item name="showMoreKeysKeyboardAtTouchedPoint">@bool/config_show_more_keys_keyboard_at_touched_point</item>
         <item name="languageOnSpacebarFadeoutAnimator">@anim/language_on_spacebar_fadeout</item>
+        <item name="altCodeKeyWhileTypingFadeoutAnimator">@anim/alt_code_key_while_typing_fadeout</item>
+        <item name="altCodeKeyWhileTypingFadeinAnimator">@anim/alt_code_key_while_typing_fadein</item>
     </style>
     <style
         name="LatinKeyboardView"