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When x=3, ViewGroup2 has already blocked the event when x=3. Why did MyView still receive an event? If the action value of this event received by MyView is printed out with log, it is found to be ACTION_CANCEL, which indicates that this event has ended for non-human reasons. Let me give an example of the ACTION_CANCEL event. Generally, when we handle the event, we will record something in the down event and then clear the record in the up event. If you have a Button in ListView, When we hold down the Button, the button receives the down event. At this moment, the finger starts to slide, and the event will be intercepted by ListView. At this time, the button will never receive the up event again. However, when ListView intercepts the event, the button will receive the cancel event, indicating that the event is ended for non-human reasons. Therefore, Cancel can do what the up event wants to do at this time.秦始皇统一六国的时候。汪魁等他们说完了，总结道：总之，时辰一到，你们不退兵，不给我们留下一半粮食，就等着替南雀公主收尸吧。大难当前，再大的才子也是扛不住的，正如后世俗话所说，是社会磨平了我的棱角。不仅是在事业上，如今连生命也要落到尹旭手里了。Forty years after the resumption of the college entrance examination, the college entrance examination day: June 9 (this Friday) at 19:40, please pay attention to Shanghai Education Television.