public static TrackableComparator getTrackableComparator() {
        return TrackableComparator.findByName(getString(R.string.pref_trackable_inventory_sort, ""));
    }
Get Trackable inventory sort method based on the last Trackable inventory sort method.

@return The Trackable Sort Method previously used.
main/src/main/java/cgeo/geocaching/settings/Settings.java