hideSystemUI

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@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void hideSystemUI() {
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){
      View rootView  = this.getWindow().getDecorView();
      if (rootView != null){
         rootView.setSystemUiVisibility(
                  View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                  | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                  | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                  | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
                  | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
                  | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
      }
   }
}