How to convert GeoPoint in Firestore to LatLng

Question

Hi I'm using Android Studio and I'm having trouble of converting data that I've got from Firestore. I saved data in my Firestore type GeoPoint and I want to query it and convert to Object type LatLng.

Here is my code:

    final FirebaseFirestore db = FirebaseFirestore.getInstance();
    final CollectionReference stores = db.collection("stores");
    stores.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                @Override
                public void onComplete(@NonNull Task<QuerySnapshot> task) {
                    if (task.isSuccessful()) {
                        for (QueryDocumentSnapshot document : task.getResult()) {
                            Log.i(TAG,document.getData().get("position").toString());
                        }
                    } else {
                        Log.w(TAG, "Error getting documents.", task.getException());
                    }
                }
            });

and Here is what i got

    12-16 10:59:21.557 28239-28239/com.company.yummy.yummy I/firebaseCatch: GeoPoint { latitude=29.339555, longitude=169.715858 }
    12-16 10:59:21.557 28239-28239/com.company.yummy.yummy I/firebaseCatch: GeoPoint { latitude=68.085393, longitude=-42.081575 }
    12-16 10:59:21.557 28239-28239/com.company.yummy.yummy I/firebaseCatch: GeoPoint { latitude=16.503923, longitude=90.196118 }
    12-16 10:59:21.557 28239-28239/com.company.yummy.yummy I/firebaseCatch: GeoPoint { latitude=-69.424524, longitude=-71.356333 }
    12-16 10:59:21.557 28239-28239/com.company.yummy.yummy I/firebaseCatch: GeoPoint { latitude=69.502257, longitude=71.100474 }

All i need is to get latitude,longtitude value to set into LatLng object.

Celestial

Answer 1

You need to extract the Latitude and Longitude from the Geopoint object received,

and make a new LatLng object, like so

double lat = document.getData().get("position").getLatitude();
double lng = document.getData().get("position").getLongitude ();
LatLng latLng = new LatLng(lat, lng);

Cortese

How to extract the Latitude and Longitude from the Geopoint I'm sorry I'm a beginner of android studio Thank you very much – Celestial

@SupagonSrisawas check the docs developers.google.com/android/reference/com/google/firebase/… – Cortese

Answer 2

To solve this, you can simply use getGeoPoint() method like this:

GeoPoint geoPoint = document.getGeoPoint("position");

And then use:

double lat = geoPoint.getLatitude();
double lng = geoPoint.getLongitude();
LatLng latLng = new LatLng(lat, lng);

Levelheaded

how if in nested object?. Products products = documentSnapshot.toObject(Products.class); System.out.println(products.getLocation().get("geoPoint").toString()); – Grijalva

@LatiefAnwar In that case you should simply use: System.out.println(products.getLocation().toString()); which will return a Geopoint objct. If you have hard time solving that, please post another fresh question using its own MCVE, so me and other Firebase developers can help you. – Levelheaded

can't we simplify it more by LatLng latLng = new LatLng(document.getGeoPoint("position").getLatitude(), document.getGeoPoint("position").getLongitude()); – Biblio

@IzhanAli You can do it if you want. – Levelheaded

Hey Supagon. Can you please explain what was wrong with my answer? – Levelheaded

Answer 3

This has worked for me with flutter cloud_firestore

void getData() {
databaseReference
    .collection("stores")
    .getDocuments()
    .then((QuerySnapshot snapshot) {
  snapshot.documents.forEach((f) {
    print('${f.data}}');
    GeoPoint pos = f.data['position'];
    LatLng latLng = new LatLng(pos.latitude, pos.longitude);

  });
});
}

Reference - https://fireship.io/lessons/flutter-realtime-geolocation-firebase/

Sobriety