How Do You Sort A Realmlist Or Realmresult By Distance?

Given a RealmObject that has the fields latitude and longitude and you have a RealmList or a RealmResult of such objects. How do you sort by distance by for example your current Lo

Solution 1:

Something like this really requires Geo spatial support to work in any efficient manner.

Right now I think your best bet is copying the data out of Realm and do manual processing in a worker thread.

If you implement it in a HandlerThread you can do something like this

RealmResults<City> results = realm.where(City.class).findAllAsync();
results.addChangeListener(new RealmChangeListener<Results<City>>() {
  @Overridepublic void onChange(RealmResults<City> cities) {
    List<City> standaloneCities = realm.copyFromRealm(cities);
    doManualSorting(standaloneCities);
    sendToUiThread(standaloneCities);
  }
});