1 <alpha xmlns:android="http://schemas.android.com/apk/res/android" 2 android:interpolator="@android:anim/accelerate_decelerate_interpolator" 3 android:fromAlpha="1.0" 4 android:toAlpha="0.0" 5 android:duration="500" 6 android:repeatCount="-1" 7 android:repeatMode="reverse" 8 android:fillAfter="true"/>
