private void openImmersiveMode() {

        if (android.os.Build.VERSION.SDK_INT > 18) {

            Window window = getWindow();

            this.getWindow()

                    .getDecorView()

                    .setSystemUiVisibility(

                            View.SYSTEM_UI_FLAG_HIDE_NAVIGATION

                                    | View.SYSTEM_UI_FLAG_FULLSCREEN

                                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);

        }

    }

@Override

    public void onWindowFocusChanged(boolean hasFocus) {

        // TODO Auto-generated method stub

        if (hasFocus) {

            Log.i("AppActivity",

                    "onWindowFocusChanged->hasFocus="

                            + String.valueOf(hasFocus));

            openImmersiveMode();

        }

        super.onWindowFocusChanged(hasFocus);

    }