public static void setContentView(@NonNull final AbstractNavigationBarActivity activity, final View contentView, final boolean showSpacer) {
        setStableLayout(activity, showSpacer);
        activity.setContentView(contentView);
        showActionBarSpacer(activity, showSpacer);
    }
use this instead of AbstractBottomNavigationActivity.setContentView for being able to use a action bar toogle
main/src/main/java/cgeo/geocaching/utils/HideActionBarUtils.java