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This is the basis of the opening and closing principle, and the specific content: interface-oriented programming, relying on abstraction rather than concreteness. When a specific class is used when writing code, it does not interact with the specific class, but interacts with the upper interface of the specific class.[Look at the Dialogue, Attending Doctor Wang Fengya, Girl with Eye Cancer: Family Never Gives Up Treatment]Next, we will finish writing other codes. First, we will define the Upload class. The objects that control the upload process will be created from the Upload class: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.由不得嘴巴直哆嗦，牙齿打颤——全酸倒了。《Cross》讲述怀着复仇之心进入了监狱医务室的天才医生姜仁奎(高庚杓 饰)与阻止其杀人的医生高正勋(曹在显 饰)在生死岔路口发生的故事。