Getting Nearby Users Android With Firebase

i am using firebase realtime database to store two types of users for two apps, users A will use App A to update their info and such, and users B will use app B to search nearby us

Solution 1:

For anyone who will find this useful i managed to do it by placing the addValueEventListenermethod of firebase within the addQueryEventListener and pass the String key that is returned by the onKeyEnteredmethod as part of the path in my database reference,

something like this

  temp2=FirebaseDatabase.getInstance().getReference("users/A");
  GeoFire geofire=newGeoFire(temp2.child("A_location"));
  GeoQuery geoQuery=geofire.queryAtLocation(newGeoLocation(lat,lng),10);

  geoQuery.addGeoQueryEventListener(newGeoQueryEventListener() {
      @OverridepublicvoidonKeyEntered(String key, GeoLocation location) {
          temp2.child(key).addValueEventListener(newValueEventListener() {
              @OverridepublicvoidonDataChange(DataSnapshot dataSnapshot) {


                  Person person1 = dataSnapshot.getValue(Person.class);

                  String name = person1.getName();
                  String imageUri = person1.getImageUri();
                  System.out.print(name + "   " + imageUri);
                  Toast.makeText(getActivity(),name,Toast.LENGTH_LONG).show();

                  personList.add(newPerson(name, imageUri));

                  RVAdapter adapter=newRVAdapter(getActivity(),personList);
                  rv.setAdapter(adapter);

              }

My only question is now is this method efficient if there are alot of users?