视频播放时全屏显示UI

定义在你的Activity中，onResume()的时候调用即可

protected void fullScreen()
  {
  requestWindowFeature(Window.FEATURE_NO_TITLE);
    
  getWindow().setFlags(
  WindowManager.LayoutParams.FLAG_FULLSCREEN,
  WindowManager.LayoutParams.FLAG_FULLSCREEN);
    
  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
  }