How to retain the rotation position of objective in android

How to retain the rotation position of objective in android

I use the following code to rotate an imageview .. How to keep the last
position of the image after rotation ?
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="true" >
<rotate
android:duration="500"
android:interpolator="@android:anim/linear_interpolator"
android:pivotX="50%"
android:pivotY="50%"
android:repeatMode="restart"
android:repeatCount="1"
android:toDegrees="-90" />
</set>
I mean : I don't want the imageview go back to the original position after
the rotation