public static boolean onMenuItemSelected(final MenuItem item, final Activity activity, final Geocache cache) {
        final App menuItem = getAppFromMenuItem(item);
        navigateCache(activity, cache, menuItem);
        return menuItem != null;
    }
Handles menu selections for menu entries created with
{@link #showNavigationMenu(Activity, Geocache, Waypoint, Geopoint)}.
main/src/main/java/cgeo/geocaching/apps/navi/NavigationAppFactory.java