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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.The next four patterns, including this pattern, are all the relationships between classes and do not involve inheritance. When learning, you should remember induction and the diagram at the beginning of this article. The observer mode is well understood, similar to email subscription and RSS subscription. When we browse some blogs or wikis, we often see RSS icons. This means that when you subscribe to the article, you will be notified in time if there are subsequent updates. In fact, in a nutshell, when an object changes, other objects that depend on the object will be notified and will change with it! Objects are a one-to-many relationship. Let's look at the diagram first:Top田遥自然知道这客是谁，就没问了。红衣少女徐彤无论如何也想象不到，站在自己面前的会是那个几乎是叱咤风云，年轻有为，一表人才……刚刚到达山阴不久的，越国所有者——越王尹旭。讲述了小燕子虽与五阿哥永琪结为连理，但是却丝毫不改调皮顽劣的本性，同永琪、尔康、紫薇又惹出不少乱子，更时不时假传圣旨安排晴儿和箫剑见面。在此过程中，小燕子渐渐弄清了自己的身世，由此对永琪和一向亲近的皇阿玛产生了矛盾复杂的感情。皇太后担心永琪的子嗣问题，遂将大家闺秀知画送到永琪身边，也使得小燕子和永琪之间产生了...