<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate 
        android:fromDegrees="0"  
        android:toDegrees="359"  
        android:duration="1000"  
        android:repeatCount="-1"  
        android:pivotX="50%"  
        android:pivotY="50%" />

</set>
