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In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:Ningxia Hui Autonomous Region1. The four bars are Captain Captain: the highest person in charge of the whole plane, who is a very experienced pilot; Sitting in the left driver's seat in the cockpit; According to international law, anyone on board the plane, including passengers, must abide by the legal instructions issued by the captain. (Passengers in our country once called out the captain of China Southern Airlines to criticize him in the air because of flight delays! ! ! )"Go to sleep with you through more than half of China" ignited the most basic and secret part of human nature. Yu Xiuhua's directness and even rudeness have hit the soft rib of modern people's fake ornaments. People hate fake ornaments and rely on fake ornaments. Once attacked, they collapse. (Novelist and Cultural Critic Ma Xiaoyan)新的一年，奥蒂斯开始了休闲性行为，埃里克和亚当正式牵手，珍也怀孕了。与此同时，新校长霍普试图让莫戴尔重新成为卓越的代名词，艾梅探索女权主义，杰克逊陷入单相思，丢失的语音信箱成为伏笔。为守约动物、外星现象、外阴纸杯蛋糕以及格罗夫夫人的更多精彩演出做好准备。This process is just speculation. I didn't analyze the source code in depth, but I typed a log and the result was that a series of dispatchTouchEvent () did return true. In other words, ViewGroup1 and ViewGroup2 did not have a consumption event, but dispatchTouchEvent () returned true, so an online saying: DispatchTouchEvent () returned true is a consumption event. This statement may not be completely accurate, but we still need to go to the source code to find the answer. We will not analyze it here, but only explain one problem: don't rewrite dispatchTouchEvent () easily. Even if overridden, try to ensure that the super method is called and the return value is consistent with the super result. In fact, the source code already provides two interfaces to indirectly rewrite it, namely onInterceptTouchEvent () and onTouchEvent (), which can be known from the source code that they are eventually called by dispatchTouchEvent (). Moreover, it is no problem to use the return value of onTouchEvent () to describe whether to consume the event (View that does not consume the event cannot call onTouchEvent () at all).