Updating overview buttons click feedback
  > Using xml bitmap for changing alpha, instead of a new bitmap
  > using state list animator, which changes the alpha of the
    whole view, and not just the icon

Change-Id: I2dda9bfba390a24a83b162c3cf4bcb9a0865f4c2
diff --git a/res/layout-v21/overview_panel.xml b/res/layout-v21/overview_panel.xml
new file mode 100644
index 0000000..fb6b512
--- /dev/null
+++ b/res/layout-v21/overview_panel.xml
@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2015 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.
+-->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_gravity="center_horizontal|bottom"
+    android:gravity="top"
+    android:orientation="horizontal" >
+
+    <TextView
+        android:id="@+id/wallpaper_button"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:drawablePadding="4dp"
+        android:drawableTop="@drawable/ic_wallpaper"
+        android:fontFamily="sans-serif-condensed"
+        android:gravity="center_horizontal"
+        android:stateListAnimator="@animator/overview_button_anim"
+        android:text="@string/wallpaper_button_text"
+        android:textAllCaps="true"
+        android:textColor="@android:color/white"
+        android:textSize="12sp" />
+
+    <TextView
+        android:id="@+id/widget_button"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:drawablePadding="4dp"
+        android:drawableTop="@drawable/ic_widget"
+        android:fontFamily="sans-serif-condensed"
+        android:gravity="center_horizontal"
+        android:stateListAnimator="@animator/overview_button_anim"
+        android:text="@string/widget_button_text"
+        android:textAllCaps="true"
+        android:textColor="@android:color/white"
+        android:textSize="12sp" />
+
+    <TextView
+        android:id="@+id/settings_button"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:drawablePadding="4dp"
+        android:drawableTop="@drawable/ic_setting"
+        android:fontFamily="sans-serif-condensed"
+        android:gravity="center_horizontal"
+        android:stateListAnimator="@animator/overview_button_anim"
+        android:text="@string/settings_button_text"
+        android:textAllCaps="true"
+        android:textColor="@android:color/white"
+        android:textSize="12sp" />
+
+</LinearLayout>
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