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並前往https://developer.android.com/reference/android/view/MotionEvent

MotionEvent | Android Developers

Views should always be prepared to handle ACTION_CANCEL and should tolerate anomalous situations such as receiving a new ACTION_DOWN without ...

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查詢 「ACTION_CANCEL」的人也找了：

  1. MotionEvent
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  2. Received an action_cancel touch event for which we have no corresponding action_down
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  3. Action_cancel action_up
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  4. getEventTime
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  5. MotionEvent action_mask
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  6. FLAG_WINDOW_IS_PARTIALLY_OBSCURED
    7.
  7. ACTION_CANCEL
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  8. action_cancel事件何时触发
    9.