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="1000"
6       android:repeatCount="-1"
7       android:repeatMode="reverse"
8       android:fillAfter="true"/>