public static boolean anyConnectorLoggedIn() {
        final ILogin[] activeConnectors = ConnectorFactory.getActiveLiveConnectors();
        for (final ILogin conn : activeConnectors) {
            if (conn.isLoggedIn()) {
                return true;
            }
        }
        return false;
    }
check if at least one connector has been logged in successfully
main/src/main/java/cgeo/geocaching/activity/AbstractNavigationBarActivity.java