public static void setDisplayHomeAsUpEnabled(final AppCompatActivity activity, final boolean enabled) {
        final ActionBar actionbar = activity.getSupportActionBar();
        if (actionbar != null) {
            actionbar.setDisplayHomeAsUpEnabled(enabled);
        }
    }
should be used after calling {@link Activity#startActivity(Intent)} when switching between two BottomNavigationActivities
main/src/main/java/cgeo/geocaching/activity/ActivityMixin.java