Collision detection with bitmaps on SurfaceView's canvas in Android?

If it is ball collision you can perform analitical collision detection - it will be much faster then per-pixel detection. You only need to have two centers of balls (x1,y1) and (x2,y2) and radius r1 for the first ball and r2 for second one. Now if distance between centers of ball is less or equal of sum of radius then the balls are colliding.

Another method I can think of will work with simple objects that can be constructed using Paths.

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