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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.4. Iterator mode2. Expansion and development are not restricted by regions;李左车投降了，是投降了韩信，这一点尹旭还是比较高兴的。樊哙出面道：汉王，能否确定这些关中策略确实是出自韩信本人之手？能够拿得出谋略，可能否实际执行？怕也是有待商榷的项羽说着与范增相视大笑。于是严厉地瞪了他们一眼，道：都进来上药吧。