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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:Let's start from the beginning. MotionEvent.ACTION_DOWN was introduced before. What is mFirstTouchTarget? The following code indicates that when the ViewGroup click event is consumed by the sub-View, the mFirstTouchTarget will point to the sub-View. Therefore, if the event is consumed by the View or is an ACTION_DOWN event, then access the ViewGroup's onInterceptTouchEvent, and if not, it is all intercepted by the current ViewGroup. In other words, if the View decides to intercept events, then this sequence of events will be handled by the View.Public interface Visitor {Gracia Nilbas　　举办羊羊运动会的目的是通过各种竞技比赛选出最强壮的羊，来出任羊族里至高无上的职位——族长，负责看守那片最鲜嫩、最肥沃、最广阔的草原——世外草原。这是件很辛苦的差事，族长要把世外草原的草籽播撒到地球的每一个角落，供养整个羊族。高大威武的盘羊、疾驰如飞的藏羚羊、性能优越的机械羊、身强力壮的黑山羊，羊村小羊们要面对的强劲对手数不胜数。没有。杰克和他的朋友查尔斯、阿贝等人痴迷于UFO，经常到森林“狩猎UFO”，遗憾的是他们并没有找到任何外星生物的痕迹，却意外收集了一些奇怪的粘质物，并将其带回了家。机缘巧合之下，杰克用粘质物创造出了一只恐龙，一只十分可爱的、充满好奇心、形似剑龙的变色恐龙，并取名 “马格纳斯”。为了避免马格纳斯人们被发现，杰克决心要把它藏起来，但是随着小恐龙的身体呈指数增长，杰克和他的小伙伴们再也无法向军方和岌岌可危的小镇隐瞒这个秘密……