안드로이드 하단 네비게이션바(메뉴바) 가리기

        int uiOptions = getWindow().getDecorView().getSystemUiVisibility();
        int newUiOptions = uiOptions;

        
        newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
        newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;
        newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
        getWindow().getDecorView().setSystemUiVisibility(newUiOptions);