i have to block status bar and home navigation bar. i used below code to block it

Question

 private void hideSystemUI() {

 View decorView = getWindow().getDecorView();

 int uiOptions = 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;

  decorView.setSystemUiVisibility(uiOptions);
   }

and also:

@Override

public void onWindowFocusChanged(boolean hasFocus)
{

 super.onWindowFocusChanged(hasFocus);

  View decorView = getWindow().getDecorView();

  decorView.setOnSystemUiVisibilityChangeListener( 
        newView.OnSystemUiVisibilityChangeListener() {

         @Override

         public void onSystemUiVisibilityChange(int i) {

            if (i == View.VISIBLE){
                hideSystemUI();
            }
            else {
                hideSystemUI();
            }
        }
    });

wrote the hidesystemUI() code in onCreate() and onResume() also, including with decorView.setOnSystemUiVisibilityChangeListener(). So i have to block it. Once i swipe at the top, it is coming and going back ( like a blink). But i have to block it. Once we swipe at the top it should not appear. help me out of this.

Answer 1

If you do not want it to blink, you may delay hiding. For example, you can give it a 2 seconds delay by Handler.postDelayed() .

private void hideSystemUI() {
    final int uiOptions = 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;

    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            getWindow().getDecorView().setSystemUiVisibility(uiOptions);
        }
    }, 2000); //2 seconds delay
}

If you are always calling this on the main thread, you can simply call new Handler() to return a Handler on the main thread. Otherwise, you will need to call new Handler(Looper.getMainLooper()) .