Storing LatLng using Android Realm

Question

What is there cleaner whay of storing a RealmObject that contains a Google\'s LatLng object int Realm?

Area {
Latlat coord;
String name
}

Answer 1

You can create Model like this which is in java :

public class ActionDataModel extends RealmObject
{
  private LocationDataModel targetLatLong;

  @NonNull
  public LatLng getTargetLatLong()
  {
    return new LatLng(targetLatLong.getLatitude(), targetLatLong.getLongitude());
  }

  public void setTargetLatLong(@NonNull LatLng targetLatLong)
  {
    this.targetLatLong = new LocationDataModel(targetLatLong);
  }

}

Here is the parent model which is in kotlin :

open class LocationDataModel(latLng: LatLng? = null)
: RealmObject() {
  var latitude = latLng?.latitude
  var longitude = latLng?.longitude
}

Answer 2

Although it might seem natural to save the data as an object

LatLng { 
 double lat; 
 double lng; 
}

remember that Realm is an object store - if you create an object, it will be stored in a table (entity). As suggested by Mohammed Ra (in the comment above), you should store an object which contains the fields latitude and longitude, both as double

class Area extends RealmObject {
  double lat; 
  double lng;
  String name;
  ...
}

This solution also improves the performance of queries involving the coordinates - in which case you should put @Index annotation on them.