private static void putCoords(final ContentValues values, final String colnamePraefix, final Geopoint coords) {
        values.put(colnamePraefix + "latitude", coords == null ? null : coords.getLatitude());
        values.put(colnamePraefix +  "longitude", coords == null ? null : coords.getLongitude());
    }
Save coordinates into a ContentValues

@param values a ContentValues to save coordinates in
@param coords coordinates to save, or null to save empty coordinates
main/src/main/java/cgeo/geocaching/storage/DataStore.java