private int countVisibleCaches() {
        return caches != null ? caches.getVisibleCachesCount() : 0;
    }
Get the current map state from the map view if it exists or from the mapStateIntent field otherwise.

@return the current map state as an array of int, or null if no map state is available
main/src/main/java/cgeo/geocaching/maps/mapsforge/v6/NewMap.java