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公元2008年5月12日14时28分，中国四川省汶川县发生里氏8级大地震，强烈的地震甚至波及全国十几个省，而位于震中附近的周边城镇则蒙受巨大灾难。　　是否还记得17岁那年　　第一次脸红心跳的样子　　面对喜欢的人，　　你会主动出击亦或是默默守候？香荽望着他的身影消失在门帘外，转眼门帘弹回来，轻轻晃动，出了会神。Event Handler: It consists of multiple callback methods, which constitute an application-related feedback mechanism for an event. There is no event handler mechanism in the Java NIO field for us to call or make callbacks, but we write our own code. Netty has made an upgrade in the role of event handler compared with Java NIO. It provides us developers with a large number of callback methods for us to implement corresponding callback methods for business logic processing when specific events are generated, namely ChannelHandler. The methods in ChannelHandler correspond to callbacks to each event.混战中，刀枪无眼，老兵也极有可能丢掉性命。Extension: From the above analysis, it can be seen that the dispatchTouchEvent () method is called by the parent View, and the child View tells the parent View whether to consume the event through the return value of this method, which is known to all. However, consider a question, Activity-> ViewGroup 1-> ViewGroup 2-> View. If the events are distributed in this order and the View finally consumes the down event, how does Activity know whether the View consumes the event? The process must be like this.When I heard this, I coughed gently and motioned for his words to be a bit off the topic. Wang Zeduan was embarrassed at first. Looking at his expression, he did feel that what he said had nothing to do with the topic, but then he smiled and didn't care, but went on to say: