@Override
    public void updateSelectedBottomNavItemId() {
        super.updateSelectedBottomNavItemId();

        // Always show c:geo logo for this activity
        final ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.setHomeAsUpIndicator(R.drawable.cgeo_actionbar_squircle);
            actionBar.setHomeActionContentDescription(R.string.about);
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }
if no connector can log in, set visibility of warning message accordingly
main/src/main/java/cgeo/geocaching/MainActivity.java