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The environment created is independent and does not interfere with each other. Pip can be used for package management without sudo permission.Pack an egg! It was passed out again, this time super was called, and DecorView inherited from ViewGroup, so DispatchTouchEvent of ViewGroup was called! Then let's take a look at the source code in ViewGroup first!Remember when I was working on the front end, That is, the first company that has just graduated, It is a company that does outsourcing projects. The company generally outsources Taobao activity pages and Tencent's game pages, We should have called it cutting the front end of the page at that time. Do some html and css work, So when I was doing Tencent's game page, Often help them make static pages, For example, put a few buttons on the page, We just helped Tencent games to fix the style according to the design draft. For example, the buttons on the page and so on, For example, how to operate the specified buttons, What happens when the button is clicked, We don't know, We don't know what their business is. Of course, what we know will definitely be a click event. We don't know exactly what business to deal with. Here we can use command mode to deal with it: after clicking the button, we must send requests to some objects responsible for specific behaviors, which are the recipients of the requests. However, at present we do not know what the receiver is or what the receiver will do. At this time, we can use command mode to eliminate the code coupling relationship between the sender and the receiver.(未完待续……) show_style();。　　黑娃、春生几个年轻人不甘心等死，他们向长老花贵爷提议，请附近陟岵寺的武僧来帮助他们对抗山贼。然而，灾荒之年，陟岵寺的武僧因饥荒化缘而走，只剩下守寺的七个僧人------2.5. 3 Requirements for V-grooves for splicing plates