1. getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置成全屏模式
  2. setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//强制为横屏
  3. requestWindowFeature(Window.FEATURE_NO_TITLE);//无标题栏

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