<?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>