كامل الشاشه

 @Override 

   public void onWindowFocusChanged(boolean hasFocus) 

{

        super.onWindowFocusChanged(hasFocus);

        if (hasFocus) {

            hideSystemUI();

        }

    }

    private void hideSystemUI() {

        // Enables regular immersive mode.

        // For "lean back" mode, remove SYSTEM_UI_FLAG_IMMERSIVE.

        // Or for "sticky immersive," replace it with SYSTEM_UI_FLAG_IMMERSIVE_STICKY

        View decorView = getWindow().getDecorView();

        decorView.setSystemUiVisibility(

                View.SYSTEM_UI_FLAG_IMMERSIVE    

                    // Set the content to appear under the system bars so that the

                        // content doesn't resize when the system bars hide and show.

                        | View.SYSTEM_UI_FLAG_LAYOUT_STABLE  

                      | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION     

                   | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN        

                // Hide the nav bar and status bar

                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION    

              

      | View.SYSTEM_UI_FLAG_FULLSCREEN);

    }

    // Shows the system bars by removing all the flags

// except for the ones that make the content appear under the system bars.

    private void showSystemUI() {

        View decorView = getWindow().getDecorView();

        decorView.setSystemUiVisibility(

                View.SYSTEM_UI_FLAG_LAYOUT_STABLE 

  

                  

   | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION   

                     | 

View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);

    }