<?xml version="1.0" encoding="utf-8"?>  
<set android:shareInterpolator="false" xmlns:android="http://schemas.android.com/apk/res/android">  
    <rotate   
        android:interpolator="@android:anim/linear_interpolator"  
        android:pivotX="50%"  
        android:pivotY="50%"  
        android:fromDegrees="0"  
        android:toDegrees="+360"  
        android:duration="1500"  
        android:startOffset="-1"  
        android:repeatMode="restart"  
        android:repeatCount="-1"/>  
</set>