使用Firestore Cloud数据库中的经度和纬度在地图视图上绘制多个标记？

Question

[你好

我已将经度和纬度存储在Firestore集合中，并使用标记将其显示在地图上。但在地图上仅显示一个标记。我想使用Firestore集合中存储的经度和纬度在地图上显示多个标记1

这是我的Java代码

    package part.time.job.v2;
    import android.os.Bundle;
    import android.view.LayoutInflater;
    import android.view.MenuItem;
    import android.view.View;
    import android.view.ViewGroup;
    import androidx.annotation.NonNull;
    import androidx.fragment.app.Fragment;
    import androidx.fragment.app.FragmentTransaction;
    import com.google.android.gms.maps.CameraUpdateFactory;
    import com.google.android.gms.maps.GoogleMap;
    import com.google.android.gms.maps.MapView;
    import com.google.android.gms.maps.OnMapReadyCallback;
    import com.google.android.gms.maps.model.LatLng;
    import com.google.android.gms.maps.model.MarkerOptions;
    import com.google.android.gms.tasks.OnSuccessListener;
    import com.google.android.material.bottomnavigation.BottomNavigationView;
    import com.google.firebase.firestore.CollectionReference;
    import com.google.firebase.firestore.FirebaseFirestore;
    import com.google.firebase.firestore.QueryDocumentSnapshot;
    import com.google.firebase.firestore.QuerySnapshot;

  public class LabourFragment extends Fragment  implements OnMapReadyCallback {
        GoogleMap mGoogleMap;
        MapView mMapview;
       public LabourFragment() {
            // Required empty public constructor
        }


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            // Inflate the layout for this fragment
            View view= inflater.inflate(R.layout.fragment_labour, container, false);

  return view;
        }

        @Override
        public void onViewCreated(@NonNull View view,  Bundle savedInstanceState) {
            super.onViewCreated(view, savedInstanceState);
            mMapview = (MapView) view.findViewById(R.id.mapView);
            if (mMapview!=null){
                mMapview.onCreate(null);
                mMapview.onResume();
                mMapview.getMapAsync(this);
            }
        }

   @Override
        public void onMapReady(final GoogleMap googleMap) {
     FirebaseFirestore mDatabase = FirebaseFirestore.getInstance();
            CollectionReference mOrderRef = mDatabase.collection("Job Post1");

            mOrderRef.get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
                @Override
                public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
                    for(QueryDocumentSnapshot documentSnapshot : queryDocumentSnapshots) {
                        if(documentSnapshot.contains("lat") && documentSnapshot.contains("lon")) {
                            String lat = (String) documentSnapshot.get("lat");
                            String lon = (String) documentSnapshot.get("lon");
                            String title = (String) documentSnapshot.get("title");

                            if(lat != null && lon != null && !lat.isEmpty() && !lon.isEmpty()) {
                                double latitude = Double.parseDouble(lat.trim());
                                double longitude = Double.parseDouble(lon.trim());
                                LatLng latLng = new LatLng(latitude, longitude);
                                googleMap.addMarker(new MarkerOptions().position(latLng).title(title));
                                googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));


                            }
                        }
                    }
                }
            });
        }
    }

这里我正在使用mapView和firebase firestore云数据库

Answer 1

用于多个标记

 @Override
        public void onMapReady(GoogleMap googleMap) {
            MapsInitializer.initialize(context);
            mgoogleMap = googleMap;
            if(Models!=null){
               for(int i=0;i<Models.size();i++){
                   if(Models.get(i).getLatitude()!=null && Models.get(i).getLongitude()!=null){
                       try {
                           addresses = geocoder.getFromLocation(Models.get(i).getLatitude(), Models.get(i).getLongitude(), 1);
                           String address = addresses.get(0).getAddressLine(0);
                           addmarker(Models.get(i).getLatitude(), Models.get(i).getLongitude(), address);
                       }catch (Exception e){

                       }

                   }

               }
            }


        }

        private void addmarker(Float latitude, Float longitude,String address) {
            mgoogleMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title(address));
            mgoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude, longitude), 12.0f));
        }