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The system configuration change here refers to the change of activity life cycle caused by the switching of horizontal and vertical screens, thus causing the change of resources. In Android, system configuration changes will cause activity destruction and reconstruction, such as horizontal and vertical screen switching, but the switching time difference is too small for the user's eyes to detect. When the activity is rebuilt, just before the previous activity is destroyed, the system will call onSaveInstanceState (Bundle outState) to store various states at that time. In the new activity, Android will read the data through onRestoreInstanceState (Bundle savedInstanceState) and automatically restore to the View of the previous activity. Of course, in the activity, the developer's own code logic needs to be processed by himself.劇中以派出所為舞台，描述基層警察中發生的故事……During this period of practice, We walk through the streets and come into contact with all kinds of people and things, which cannot be felt in the school. There may be teachers in the school who say what to do on this day and what to do tomorrow, but there will be no one who will tell you this. You must understand what to do, do it yourself, and do your best.I. Original Sin of Formula这是一段尘封多年的传奇往事，发生在一个由帮会、租界、平民、警匪、日军、特工们组成的传奇上海。1931年，九一八的血雨腥风刮进了上海的十里洋场，三个来自不同家庭的年轻人因缘际会，在上海滩相遇。两个男孩一个出身于上海里弄的普通人家，一个被国民党军校校长收养，他们的小妹则是漕帮大佬最心爱的女儿。时代的洪流将他们扔进命运的熔炉，他们的青春、爱情、理想、信仰都受到了严酷的淬炼。随着他们身世之谜的逐步揭开，一幅巨大的上海俗世画卷也缓缓铺陈在眼前。当日本蚕食中国的阴谋浮出水面，当残酷的命运撕裂家庭与感情，当恐怖的谍影重重笼罩，党派斗争相互倾轧，在上海这座无助的孤岛上，他们兄妹三人也走上了完全不同的人生道路。1932年1月，严冬肃杀，日军终于对上海发动了蓄谋已久的攻势。无数的血性上海民众自发加入了这场旷日持久的战争中，他们与19路军同仇敌忾，不懈努力，谱写了一曲壮烈的悲歌，三个年轻人的命运也一起在此交缠纠葛，走向终点。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:Unicom