Rotate ImageView vertically

I want to do flipping animation of Image View horizontally ( around x-axis ). I have done the clockwise and anti-clockwise animation. Here is the code I have used ...

<set xmlns:android="http://ift.tt/nIICcg"> 
    <rotate 
        android:fromDegrees="0" 
        android:toDegrees="180" 
        android:pivotX="50%" 
        android:pivotY="50%" 
        android:duration="300" 
        android:fillAfter="true" 
        android:fillEnabled="true" />
</set>

I also want to rotate it continuously and it should halt for a moment after each flip.