How can I retrieve nearby bakeries to users using firebase

Question

I know that this question has been asked over and over but I just can't seem to get a good answer. I am trying to retrieve data based off of the users location. For example lets say my database has a list of bakeries. Each bakery has an address, the longitude and latitude,postal code,city,state. Now I want to display all of the bakeries to customers but only the ones that are around their area lets say 5 miles away how would I go about doing that. I've been looking for answers for the past few days and nothing seems to be working. I even tried this answer I saw on Stack overflow and its not working. Someone please please please help me with this. Below is my code

//This page is where after the user registers it will automatically save the longitude and latitude and that's when it will save the Geohash etc

     mFusedLocationClient.getLastLocation()
                .addOnSuccessListener(this, new OnSuccessListener<Location>() {
                    @Override
                    public void onSuccess(final Location location) {
                        // Got last known location. In some rare situations this can be null.
                        if (location != null) {
                            // Logic to handle location object
                            Double latittude = location.getLatitude();
                            Double longitude = location.getLongitude();

                            String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
                            DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference("Users");
                            DatabaseReference update = rootRef.child(uid);
                            GeoFire geoFire=new GeoFire(rootRef);

                            geoFire.setLocation("latandlong", new GeoLocation(location.getLatitude(), location.getLongitude()), new GeoFire.CompletionListener() {
                                @Override
                                public void onComplete(String key, DatabaseError error) {
                                    if (error != null) {
                                        System.err.println("There was an error saving the location to GeoFire: " + error);
                                    } else {
                                        System.out.println("Location saved on server successfully!");
                                    }
                                }
                            });


                            geoFire.getLocation("latandlong", new LocationCallback() {
                                @Override
                                public void onLocationResult(String key, GeoLocation location) {
                                    if (location != null) {
                                        System.out.println(String.format("The location for key %s is [%f,%f]", key, location.latitude, location.longitude));
// save longitude and latitude to db

                                        String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
                                        DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
                                        DatabaseReference update = rootRef.child("Users").child(uid);
                                        Double longi = location.longitude;
                                        Double lat = location.latitude;




                                        update.child("latandlong").setValue(location.latitude+ "," +location.longitude);
                                        //update.child("longitude").setValue(longi);
                                        //update.child("latitude").setValue(lat);
                                    } else {
                                        System.out.println(String.format("There is no location for key %s in GeoFire", key));
                                    }
                                }

                                @Override
                                public void onCancelled(DatabaseError databaseError) {
                                    System.err.println("There was an error getting the GeoFire location: " + databaseError);
                                }
                            });



     protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_news_feed);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR);



        menuItem=(MenuItem)findViewById(R.id.item_sign_in);




        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);


        recycler=findViewById(R.id.recyclerView);
        recycler.setLayoutManager(new LinearLayoutManager(this));

        final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();

        mFusedLocationClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() {
            @Override
            public void onSuccess(Location location) {

                Double lat=location.getLatitude();
                Double longi=location.getLongitude();

                firebaseDatabase=FirebaseDatabase.getInstance().getReference("Users");
                GeoFire geoFire=new GeoFire(firebaseDatabase.child("latandlong"));

                GeoQuery geoQuery=geoFire.queryAtLocation(new GeoLocation(lat,longi),5);

                geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
                    @Override
                    public void onKeyEntered(String key, GeoLocation location) {
                        firebaseDatabase.child(key).addValueEventListener(new ValueEventListener() {
                            @Override
                            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                                if(dataSnapshot.exists()){
                                    list=new ArrayList<UserInformation>();

                                    for(DataSnapshot dataSnapshot1:dataSnapshot.getChildren()){
                                        UserInformation uuu=dataSnapshot1.getValue(UserInformation.class);
                                        list.add(uuu);

                                    }
                                }

                                adapter=new MyAdapter(NewsFeedActivity.this,list);
                                recycler.setAdapter(adapter);

                            }

                            @Override
                            public void onCancelled(@NonNull DatabaseError databaseError) {

                            }
                        });
                    }

                    @Override
                    public void onKeyExited(String key) {

                    }

                    @Override
                    public void onKeyMoved(String key, GeoLocation location) {

                    }

                    @Override
                    public void onGeoQueryReady() {

                    }

                    @Override
                    public void onGeoQueryError(DatabaseError error) {

                    }
                });




            }
        });

Answer 1

First of all you need to check that data for that location is added to geofire or not. You can add that data while adding bakery data to firebase like below

geoFire.setLocation("your key", new GeoLocation(37.7853889, -122.4056973));

and geofire query method takes distance in km not miles so you have to convert 5 miles to km.

GeoQuery geoQuery=geoFire.queryAtLocation(new GeoLocation(lat,longi),5); //distance in km

Answer 2

This is how you initialize GeoFire:

firebaseDatabase=FirebaseDatabase.getInstance().getReference("Users");
GeoFire geoFire=new GeoFire(firebaseDatabase.child("latandlong"));

This means that in your database you're expected to have a node /Users/latandlong, under which you have a node with the geohash and lat/lon for each key you want to track. So:

Users: {
  latandlong: {
    "IEvLcwll....SQkbp2": {
      g: "..."
      l: { 0: ..., 1: ... }
    }
  }
}

This structure is different from what's in the screenshot you shared, as you are missing the key level: "IEvLcwll....SQkbp2". This explains why any geoquery you fire on geoFire won't find any keys.

I highly recommend reading the GeoFire documentation on:

1. How to initialize the GeoFire object, which you'll typically want to point to a top-level node.
2. Then set the location data for a specific key, which will then become a child node under the top-level node you set in the previous step.

Only once you've done these two steps correctly, will you be able to execute a geoquery against the data.