Detecting when system buttons are visible while using 'immersive mode'

Question

I'm currently using immersive mode (API 19) for one of my Activities as follows:

getWindow().getDecorView()
            .setSystemUiVisibility(
                    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
                            | View.SYSTEM_UI_FLAG_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                            | View.INVISIBLE);

This hides the system buttons and notification bar until the user swipes for them back. This works fine, however I wish to detect when the user makes the buttons visible again. I've tried a OnSystemUiVisibilityChangeListener but it does not trigger for this particular event.

Any ideas?

Answer 1

From Android Developers video, when you're in immersive sticky mode, the app isn't notified.

Immersive sticky mode starts at 6:56 and around 7:25 Roman Nurik tells that the listener won't be triggered.

This is the video: http://youtu.be/cBi8fjv90E4?t=6m56s

Answer 2

I have found a solution that suits me even though it's not perfect. I set the UI visiblity to View.SYSTEM_UI_FLAG_IMMERSIVE instead of View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY and when I receive the onSystemUiVisibilityChange callback, I delay a message to an Handler to reset the UI Visibility. Here is the code :

private static final int FULL_SREEN_MSG = 10;
private static final long TIME_BEFORE_HIDE_UI = 2 * DateUtils.SECOND_IN_MILLIS;

private final Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        if (msg.what == FULL_SREEN_MSG) {
            setFullscreen();
        }
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setFullscreen();
    getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(this);
}

private void setFullscreen() {
    getWindow().getDecorView().setSystemUiVisibility(
            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);
}

@Override
public void onSystemUiVisibilityChange(int visibility) {
    if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
        mHandler.sendEmptyMessageDelayed(FULL_SREEN_MSG, TIME_BEFORE_HIDE_UI);
    }
}