A couple things:

This might help your pivot point that you have: instead of converting to 
float after the division, try doing it before the division. Like this: 
((float)mBitmap.getHeight())/2f   -- I believe you are losing some accuracy 
by doing it the other way around. As in (float)(7/2) would equal 3, not 3.5.

Secondly, if you're end goal is to just draw a rotated image to the canvas 
during the onDraw call (which I suspect that it is), then there's no reason 
to create a second bitmap. Something like this should work:

   float px = ((float)mBitmap.getHeight())/2f;
   float py = ((float)mBitmap.getWidth())/2f;
   m.setRotate(mRotation, px, py);
   canvas.drawBitmap(mBitmap, m, null);

Also, if you're not doing anything funky with your paint (like ColorFilters, 
etc.), then just leave it null.

--Nick

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