MapsFragment.java

package fr.imt_atlantique.myfirstapplication;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.Toolbar;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.Fragment;

import android.Manifest;
import android.app.AlertDialog;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsFragment extends Fragment {

    private Toolbar toolbar;

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

    public static MapsFragment newInstance() {
        return new MapsFragment();
    }

    private OnMapReadyCallback callback = new OnMapReadyCallback() {

        /**
         * Manipulates the map once available.
         * This callback is triggered when the map is ready to be used.
         * This is where we can add markers or lines, add listeners or move the camera.
         * In this case, we just add a marker near Sydney, Australia.
         * If Google Play services is not installed on the device, the user will be prompted to
         * install it inside the SupportMapFragment. This method will only be triggered once the
         * user has installed Google Play services and returned to the app.
         */
        @Override
        public void onMapReady(GoogleMap googleMap) {
            // We check for the application "Call permission"
            if (ContextCompat.checkSelfPermission(requireContext(),
                    Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                grantPermissionAlertDialog();
                return;
            }
            try {
                googleMap.setMyLocationEnabled(true);
                googleMap.getUiSettings().setZoomGesturesEnabled(true);
                googleMap.getUiSettings().setCompassEnabled(true);
                googleMap.getUiSettings().setMyLocationButtonEnabled(true);
            } catch (SecurityException e) {
                Log.e("MapsFragment", "Error while enabling location", e);
            }
        }
    };

    private void grantPermissionAlertDialog() {
        new AlertDialog.Builder(requireContext())
                .setTitle(getString(R.string.position_permission_title))
                .setMessage(getString(R.string.position_permission_message))
                .setNegativeButton(getString(R.string.cancel), (dialog, which) -> Toast.makeText(requireContext(), getString(R.string.permission_denied), Toast.LENGTH_SHORT)
                        .show())
                .setPositiveButton("Ok", (dialog, which) -> ActivityCompat.requestPermissions(requireActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 3))
                .create()
                .show();
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater,
                             @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_maps, container, false);

    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        toolbar = view.findViewById(R.id.mapsToolbar);
        toolbar.inflateMenu(R.menu.menu_maps);
        SupportMapFragment mapFragment =
                (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map);
        if (mapFragment != null) {
            mapFragment.getMapAsync(callback);
        }
    }
}