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Then there is why you always call to ViewGroup2's onTouchEvent () method, because ViewGroup2 has no child View to handle the event, so you will call ViewGroup2's super.dispatchTouchEvent (), that is, the parent class View.dispatchTouchEvent () method, so if you don't set onTouchListener, you will inevitably call onTouchEvent ().The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu舰队常年补给无惊无险，此时也并未有人放哨，两队人直至潜到梯板前依然未被发现。……沙加路瞪着杨长帆片刻，突然转望徐文长，您曾在欧洲或者美洲大陆游历过么？徐文长闻言大笑：中华儿女，如鸥鸟豚鱼，遍布四海，鄙人不过一只井底之蛙。Int result = new Minus (). Pret ((new Context (new Plus ())Principal offender Weng Siliang, male, from Shanwei, Guangdong, was 25 years old at that time.小瓶盖因母亲因交通意外离世被送到泰瑞莎之家。同院的小泽亚一直守护着她直到被SET董事长徐若谷接走，临走前约好回来接她，但等他再次回来时小瓶盖己离开。多年后，学成回国的徐泽亚(许绍洋 饰) 已经成了SET电视公司的总经理，而他人生继续下去只剩下与“小瓶盖”的约定。在寻找小瓶盖的过程中他在海豚湾邂逅了易天边(张韶涵 饰) ，天边坚强乐观的个性吸引着他，两人间似乎产生了情愫。金牌制作人钟晓刚(霍建华 饰) 要做一张《漫步云端》的专辑，一直在寻找理想的声音。酷爱音乐的天边有一把动人的嗓子，梦想成为歌星，经过层层筛选取得SET的歌唱比赛表格，最终成为《漫步云端》的演唱者。而SET董事长徐若谷似乎也隐藏着另一个众人所不知道的秘密，泽亚是否能追寻已久的真相呢？他能否找到当年的小瓶盖呢？