(Android lock screen source code, such as LockScreenActivity. To understand the process, first of all, we need to obtain android device management. LockScreen is inherited from DeviceAdminReceiver and gets whether the current device manager has been activated. If it has not been activated, we will prompt the user to activate it (when running the program for the first time). If it has been activated, we will immediately lock the screen and kill Myself. After locking the screen, we will immediately kill our Activity to prevent the waste of resources.)
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