Rotate animation not working in android 4.0

Question

In my Android application, I apply programmatically a rotation animation to a drawable object :

    Animation rotation = AnimationUtils.loadAnimation(this, R.animator.rotate);
    rotation.setRepeatCount(Animation.INFINITE);
    progressDialog.findViewById(R.id.progress).startAnimation(rotation);

This is working fine in Android 2.3, but fails in 4.0. The drawable is not animated in 4.0. What could be the problem here ?

EDIT Here is my rotate.xml file :

<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
    <rotate
        android:fromDegrees="0"
        android:toDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%" 
        android:duration="2000"
        android:repeatCount="-1"
        android:interpolator="@android:anim/linear_interpolator"/>
</set>

Answer 1

I moved the code just before the call of the show method of the container view and it's working now, both in 2.3 and 4.0 :

Animation rotation = AnimationUtils.loadAnimation(MainView.this, R.animator.rotate);
progressDialog.findViewById(R.id.progress).startAnimation(rotation);
progressDialog.show();