anim_clockwise_rotation.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">

    <rotate
        android:duration="5000"
        android:fromDegrees="0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="360"></rotate>

    <rotate
        android:duration="5000"
        android:fromDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%"
        android:startOffset="5000"
        android:toDegrees="0"></rotate>

</set>