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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.皇家跑马场位于皇城东面。PS: Many forums have seen beginners ask whether WCF still needs to learn in depth, because they think these technologies may be outdated. Maybe Microsoft will launch a new SOA implementation scheme at that time. Wouldn't it be a waste of time to learn in depth, so they feel that there is no need to learn in depth and just know how to use them. I had the same feeling about this problem before, but now I think that although WCF technology may be replaced, the key to understanding a technology in depth is not to know some more advanced API calls, but to understand its implementation mechanism and way of thinking. Even if the latter technology is replaced, the mechanism behind it is definitely similar. Therefore, if you have a thorough understanding of a technology, you will feel familiar with the new technology and relaxed about it. In addition, after you have a thorough understanding of a technology, you dare to say that you have mastered the technology well during the interview, instead of saying that you use it a lot at ordinary times. Once you ask deeply, you do not know the implementation principle behind it. This is also why I want to write WCF series. I hope this opinion is helpful to some beginners.本剧讲诉了杉并中央署集合了几个专门处理麻烦的「万能咨询室」的成员的故事为音乐梦想在城市打拼的李晓武在某天迎来了妹妹李晓雯的探望，与此同时，邂逅了欧吕妙以及任小飞。性格迥异，生活不同的四个年轻人经历了各自的感情冲突，对人生有了新的认识。