Any way to avoid overlapping of 2 images on android ?

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Mobile

Android

animation

For an anroid app, Im doing infinite Translate Animation.
imageview starts first and after a delay of 1 second, imageview2 starts.

Animation animation = new TranslateAnimation(0, 0, -500, 500);
animation.setDuration(4000);
imageview.startAnimation(animation);
animation.setRepeatCount(Animation.INFINITE);

Animation animation2 = new TranslateAnimation(0, 0, -500, 500);
animation2.setDuration(4000);
imageview2.startAnimation(animation2);
imageview2.setStartOffset(1000);
animation2.setRepeatCount(Animation.INFINITE);

The problem is that, after sometime imageview overlaps imageview2.
What Can I do to avoid the overlapping of 2 images ?

Any pointer would be appreciated.