Volume control for Casting with CastPlayer and custom notification

I want to use my own notification for casting in Player Service. I use:

public class CastOptionsProvider implements OptionsProvider {

    @Override
    public CastOptions getCastOptions(Context context) {

        CastMediaOptions mediaOptions = new CastMediaOptions.Builder().setNotificationOptions(null).build();
        return new CastOptions.Builder().setReceiverApplicationId(context.getString(R.string.app_id)).setCastMediaOptions(mediaOptions).build();
    }

    @Override
    public List<SessionProvider> getAdditionalSessionProviders(Context context) {
        return null;
    }
}

But with that code I lose ability to control Chromecast volume with physical buttons. With default options I have 2 notifications (one from foreground service and one from OptionsProvider). Do you have any solutions?

I have solved this with:

player.setOnCastAvailabilityChangeListener(isAvailable -> {
    if(isAvailable){
        final int MAX_VOLUME = 20; //Steps of volume

        CastContext castContext = CastContext.getSharedInstance(URLPlayerService.this);
        SessionManager sessionManager = castContext.getSessionManager();
        CastSession castSession = sessionManager.getCurrentCastSession();

        if (castSession != null) {
            int initialVolume = (int) (castSession.getVolume() * MAX_VOLUME);

            mediaSessionCompat.setPlaybackToRemote(new VolumeProviderCompat(
                    VOLUME_CONTROL_RELATIVE, MAX_VOLUME, initialVolume) {

                @Override
                public void onAdjustVolume(int direction) {
                    super.onAdjustVolume(direction);

                    if (castSession.isConnected()) {
                        int currentVolume = getCurrentVolume();
                        int newVolume = Math.max(0, Math.min(currentVolume + direction, MAX_VOLUME)); // Clamp within range

                        try {
                            castSession.setVolume((double) newVolume / MAX_VOLUME);
                            setCurrentVolume(newVolume);
                        } catch (IOException e) {
                            throw new RuntimeException(e);
                        }

                        Timber.tag("Cast").d("Volume changed from %s to %s (Max: %s)", currentVolume, newVolume, MAX_VOLUME);
                    } else {
                        Timber.tag("Cast").e("No active Cast session");
                    }
                }
            });
        }
    }
});