First You need to check whether the latitude that generated is existed in database fields or not. Check it out official documentation.

Firestore documentation

Then if existed you will get the document id and you can use that.

I created a fragment and took a Mapview on it. My Firestore database has a collection called Job Post1 which contains some documents and some fields in it. With that, I fetch Longitude and Latitude with the help of a marker shown on the Mapview.

What I want to do: after clicking on the marker on the Mapview, I want to show all fields in that document (the document from which i have plotted the marker with the help of longitude and latitude) on a Bottomsheet which I created.

What I did: I fetched the fields using documentsnapshot and in the updateBottomSheetContent() method I created a Strings and setText it.
After doing this, when I click on the marker, the hidden sheet is open and data fetch on it of his document but when I click another marker same data fetch instead of his own document. This is my problem.

My Java Code

package part.time.job.v2;


import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.constraintlayout.widget.Constraints;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
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.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.android.libraries.places.api.Places;
import com.google.android.libraries.places.api.model.Place;
import com.google.android.libraries.places.api.model.PlaceLikelihood;
import com.google.android.libraries.places.api.net.FindCurrentPlaceRequest;
import com.google.android.libraries.places.api.net.FindCurrentPlaceResponse;
import com.google.android.libraries.places.api.net.PlacesClient;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.bottomsheet.BottomSheetBehavior;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QueryDocumentSnapshot;
import com.google.firebase.firestore.QuerySnapshot;
import com.google.maps.android.ui.IconGenerator;

import java.util.Arrays;
import java.util.List;
import java.util.Objects;

import model.Jobpost;
import model.Journal;

import static com.android.volley.VolleyLog.TAG;


/**
 * A simple {@link Fragment} subclass.
 */
public class LabourFragment extends Fragment  implements OnMapReadyCallback {
    private GoogleMap mGoogleMap;
    private MapView mMapview;


    private Location mLastKnownLocation;
    Dialog myDialog;
    private BottomSheetBehavior bottomSheetBehavior;
    private View bottomSheet;
    private String title1;
    private String desc1;
    private String cate1;
    private String age1;
    private String vac1;
    private String loc1;
    private String jdate1;
    private String time1;
    private String whour1;


    FirebaseFirestore mDatabase = FirebaseFirestore.getInstance();
    CollectionReference mOrderRef = mDatabase.collection("Job Post1");

    public LabourFragment() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {



        if (savedInstanceState != null) {
            mLastKnownLocation = savedInstanceState.getParcelable(KEY_LOCATION);
            mCameraPosition = savedInstanceState.getParcelable(KEY_CAMERA_POSITION);
        }
        // Inflate the layout for this fragment
        View view= inflater.inflate(R.layout.fragment_labour, container, false);
//        myDialog = new Dialog(getActivity());
        bottomSheet = view.findViewById(R.id.bottom_sheet);
        bottomSheetBehavior = BottomSheetBehavior.from(bottomSheet);
        bottomSheetBehavior.setPeekHeight(120);
        bottomSheetBehavior.setHideable(true);
        bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);

        Places.initialize(getActivity(), getString(R.string.google_maps_key));
        mPlacesClient = Places.createClient(getActivity());


        mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(getActivity());


        return view;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        if (mGoogleMap != null) {
            outState.putParcelable(KEY_CAMERA_POSITION, mGoogleMap.getCameraPosition());
            outState.putParcelable(KEY_LOCATION, mLastKnownLocation);
            super.onSaveInstanceState(outState);
        }
    }

    @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) {

        mGoogleMap=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");
                        title1= (String) documentSnapshot.get("title");
                        desc1= (String) documentSnapshot.get("desc");
                        cate1= (String) documentSnapshot.get("category");
                        age1= (String) documentSnapshot.get("age");
                        vac1= (String) documentSnapshot.get("vacancy");
                        loc1= (String) documentSnapshot.get("location");
                        jdate1= (String) documentSnapshot.get("jobdate");
                        time1= (String) documentSnapshot.get("time");
                        whour1=(String) documentSnapshot.get("workinghours");

                            if(lat != null && lon != null && !lat.isEmpty() && !lon.isEmpty()) {
                            double latitude = Double.parseDouble(lat.trim());
                            double longitude = Double.parseDouble(lon.trim());
                            IconGenerator iconGen = new IconGenerator(getActivity());

                            googleMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title(title1).icon(BitmapDescriptorFactory.fromBitmap(iconGen.makeIcon(title1))));
                            googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude, longitude), 18.0f));

                            googleMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {

                                @Override
                                public boolean onMarkerClick(Marker marker) {
                                    marker.getTitle();

                                    updateBottomSheetContent(marker);
                                    return true;
                                }
                            });
                            googleMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
                                @Override
                                public void onMapClick(LatLng latLng) {
                                    bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
                                }
                            });

                        }

                    }
                }



            }

        });

         }

    private void updateBottomSheetContent(final Marker marker) {
        final TextView jobT = (TextView) bottomSheet.findViewById(R.id.jobTitle);
       final TextView desc = (TextView) bottomSheet.findViewById(R.id.jobDesc);
        final TextView cate = (TextView) bottomSheet.findViewById(R.id.categ);
        final TextView age = (TextView) bottomSheet.findViewById(R.id.ageLimit);
        final TextView vac = (TextView) bottomSheet.findViewById(R.id.vacan);
        final TextView loc = (TextView) bottomSheet.findViewById(R.id.locat);
        final TextView workingH = (TextView) bottomSheet.findViewById(R.id.workingHour);
        final TextView date = (TextView) bottomSheet.findViewById(R.id.jobDate);
        final TextView expire = (TextView) bottomSheet.findViewById(R.id.jobExpire);
        final TextView uid = (TextView) bottomSheet.findViewById(R.id.uid);
        final TextView time = (TextView) bottomSheet.findViewById(R.id.timeStart);



        jobT.setText(title1);
        desc.setText(desc1);
        cate.setText(cate1);
        age.setText(age1);
        vac.setText(vac1);
        loc.setText(loc1);
        workingH.setText(whour1);
        date.setText(jdate1);
        time.setText(time1);


        bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED);
    }


}

This is Database Structure