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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 ().Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:22岁的金妍雨在海边长大，性格开朗、诚实正直，为了赚钱谋生，她放弃了上大学的机会来到汉城，并在有线电视台购物频道当节目主持人。南雀军见他那紧张的样子，再次大笑起来。Unicom二零一零年，国家航天局挑选了一个香港科研团队作合作伙伴，于杰教授就是团队的掌舵人，他将会为登月任务研发「相机指向系统」。未来某时，一种丑陋凶恶、仿佛来自地狱的怪物肆虐人间，大肆屠杀人类。某小镇在怪物的荼毒下宛如一座死城，生存者战战兢兢，惶恐度日。