@Override
    public Boolean filter(final Geocache cache) {
        if (cache == null) {
            return null;
        }
        if (listId < 0) {
            return true;
        }
        return cache.getLists().contains(listId);
    }
filters for any one listid. Supports Storedlist as well as Psuedolist
main/src/main/java/cgeo/geocaching/filters/core/ListIdGeocacheFilter.java