CODE EXAMPLE FOR JAVA

android hide system bar programmatically

  private void hideSystemBars() {
        WindowInsetsControllerCompat windowInsetsController =
                ViewCompat.getWindowInsetsController(window.getDecorView());
        if (windowInsetsController == null) {
            return;
        }
        // Configure the behavior of the hidden system bars
        windowInsetsController.setSystemBarsBehavior(
                WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
        );
        // Hide both the status bar and the navigation bar
        windowInsetsController.hide(WindowInsetsCompat.Type.systemBars());
    }