In Android, what is the difference between getAction() and getActionMasked() in MotionEvent?

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getAction() returns a pointer id and an event (i.e., up, down, move) information.

getActionMasked() returns just an event (i.e., up, down, move) information. Other info is masked out.

For example:

getAction() returns 0x0105.
getActionMasked() will return 0x0005, which is 0x0105 && ACTION_MASK.

  1. The value of ACTION_MASK is 0xFF. It masks the following actions.
    • ACTION_DOWN 0, UP 1, MOVE 2
    • ACTION_POINTER_DOWN 5, UP 6
  2. The value of ACTION_POINTER_ID_MASK is 0xFF00. It masked the pointer ID from following deprecated constants.
    • ACTION_POINTER_1_DOWN 0x0005
    • ACTION_POINTER_2_DOWN 0x0105
    • ACTION_POINTER_3_DOWN 0x0205
    • …

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