按照GPS距离由近到远排序

List<Shop> sortByGPS(List<Shop> list) {
    Collections.sort(list, new Comparator<Shop>() {
        @Override
        public int compare(Shop o1, Shop o2) {
            double dist1 = GPS.distance(o1.getLat(), o1.getLng());
            double dist2 = GPS.distance(o2.getLat(), o2.getLng());
            return (int) (dist1 - dist2);
        }
    });
    return list;
}