android:dither="true" does not dither, what's wrong?
Ran into this problem too today and found and used your solution : Create the png in photoshop with transparency set AND having at least one pixel using the alpha. Actually what i did is set the layer to a 99% opacity. Doesn't affect the colors or anything and make the Android compiler leave my png alone.
Try to put this line
getWindow().setFormat(PixelFormat.RGBA_8888);
just after super.onCreate() and see if it helps.