res/anim/button_slide.xml - platform/external/replicaisland - Git at Google

 <?xml version="1.0" encoding="utf-8"?>
 <alpha xmlns:android="http://schemas.android.com/apk/res/android"
 	android:fromAlpha="0.0"
 	android:toAlpha="1.0"
 	android:duration="1000" />
	<?xml version="1.0" encoding="utf-8"?>
	<alpha xmlns:android="http://schemas.android.com/apk/res/android"
	android:fromAlpha="0.0"
	android:toAlpha="1.0"
	android:duration="1000" />