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For MotionEvent.ACTION_POINTER_DOWN or MotionEvent.ACTION_POINTER_UP as returned by MotionEvent.ActionMasked, this returns the associated pointer index. The index may be used with MotionEvent.GetPointerId(int), MotionEvent.GetX(int), MotionEvent.GetY(int), MotionEvent.GetPressure(int), and MotionEvent.GetSize(int) to get information about the pointer that has gone down or up.