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MotionEvent.ACTION_CANCEL is not triggered during onTouch

It seems that ACTION_UP is the only MotionEvent that is called after ACTION_DOWN . I wanted to trigger ACTION_CANCEL once my finger is not anymore in the view ...

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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
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  7. ACTION_CANCEL
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  8. action_cancel事件何时触发
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