[android-developers] Drawable.mutate().setAlpha() not working pre 2.2?

I have an ImageView and do this:

Drawable d = getResources().getDrawable(R.drawable.my_image);
d.mutate().setAlpha(50);
myImageView.setImageDrawable(d);

This works fine on 2.2 but on 1.6 and 2.1 (the only other ones I've
tested on) the alpha has not been changed.

Is this a bug or am I doing something wrong?

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