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In fact, the code only sets the newly opened WeChat in the new task stack, which is to intercept the return key in the page of WeChat LauncherUI in time "just hide the application in the background without exiting and then return to the desktop", thus our App is the launcher, so we return to our App. In the same way, WeChat can be seen by looking at the real running tasks in the navigation bar.季木霖收起无语的表情，继续吃早饭。Dark-brown: jiuxiong*, waxberry*, chestnut …即便是暂时停战对峙，韩信也会想办法把汉国和梁国变成他的势力范围，如此一来在中原，我们的既得利益和战略就会全部受到压制。南瓜见了低声问道：想吃那个？那是一碟辣味豆（蚕豆），喝茶的时候用来磨牙的。Next, we will talk about the responsibility chain mode. There are multiple objects, each of which holds a reference to the next object, thus forming a chain on which requests are passed until an object decides to process the request. However, the sender does not know which object will process the request in the end, so the responsibility chain mode can be implemented to dynamically adjust the system without concealing the client. Let's look at the diagram first: