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Some software developers always want to set up a certain design pattern when designing programs. In fact, this is wrong and they do not really master the idea of design pattern. In fact, many times readers use a certain design pattern, but they just don't know what the name of this pattern is. Therefore, when designing programs, we should use appropriate design patterns according to our own understanding.This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:该剧讲述了经侦队长萧剑与金融天才胥枫屡屡交手，最终破获跨国金融案件的故事。不等郑氏开口，话锋一转道，那也不成，谁让她是刘家闺女哩。The top ViewGroup here is MainActivity (DecorView). First, the down event is sent to the child view, then the child view does not consume it, and then it is handed over to the parent view for consumption layer by layer. Finally, no one consumes it back to MainActivity, and the down event ends. From the above source code analysis, it can be seen that the mFirstTouchTarget is empty at this time. If the move event comes, the else interception event of the source code number 2 part will be directly executed, so the log of the subsequent event will not be distributed as above (and the log of the onInterceptTouchEvent () method will not be called at the same time). If the child view consumes the down event, mFirstTouchTarget is not empty, and the process of subsequent events is similar to down. Readers can modify MyView's onTouchEvent () to consume the down event and try to consume the down event.四月一日，所有武侠爱好者，所有书友都在等着那一天。阴差阳错之间，打算开拍新电影的顾维邦结识了孟思凡，两人在丽宫电影院遇见，准备拍摄一部以戏院为背景的惊悚爱情电影。电影前期准备完毕，剧组准备在丽宫电影院开机，这一家电影院正是传说中的灵异剧院。