<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="@string/google_maps_key" />
        

package net.sadaji.mapbasic;

import androidx.fragment.app.FragmentActivity;

import android.os.Bundle;

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;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationSettingsRequest;
import com.google.android.gms.location.LocationSettingsResponse;
import com.google.android.gms.location.SettingsClient;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import androidx.core.app.ActivityCompat;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Looper;
import com.google.android.gms.maps.model.Marker;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;
    private FusedLocationProviderClient mFusedClient;
    private SettingsClient mSettingClient;
    private LocationSettingsRequest mSettingRequst;
    private LocationCallback mLocCallback;
    private LocationRequest mLocReq;
    private Marker mMarker;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

        mFusedClient = LocationServices.getFusedLocationProviderClient(this);
        mSettingClient = LocationServices.getSettingsClient(this);
        if (ActivityCompat.checkSelfPermission(this,android.Manifest.permission.ACCESS_FINE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,
                    new String[] {android.Manifest.permission.ACCESS_FINE_LOCATION}, 1);
        }

        mLocCallback = new LocationCallback() {
            @Override
            public void onLocationResult(LocationResult locationResult) {
                super.onLocationResult(locationResult);
                Location loc = locationResult.getLastLocation();
                LatLng latlng = new LatLng(loc.getLatitude(), loc.getLongitude());
                mMap.animateCamera(CameraUpdateFactory.newLatLng(latlng));
                mMarker.setPosition(latlng);
            }
        };

        mLocReq = new LocationRequest();
        mLocReq.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY).
                setInterval(5000).
                setFastestInterval(1000);

        LocationSettingsRequest.Builder builder =
                new LocationSettingsRequest.Builder();
        mSettingRequst = builder.addLocationRequest(mLocReq).build();

        startFusedLocation();
    }

    private void startFusedLocation() {
        mSettingClient.checkLocationSettings(mSettingRequst)
                .addOnSuccessListener(this,
                        new OnSuccessListener() {
                            @Override
                            public void onSuccess(
                                    LocationSettingsResponse locationSettingsResponse) {
                                        if (ActivityCompat.checkSelfPermission(MapsActivity.this,
                                            android.Manifest.permission.ACCESS_FINE_LOCATION) !=
                                            PackageManager.PERMISSION_GRANTED ) {
                                            return;
                                        }
                                        mFusedClient.requestLocationUpdates(
                                            mLocReq, mLocCallback, Looper.myLooper());
                                    }
                        })
                .addOnFailureListener(this, new OnFailureListener() {
                    @Override
                    public void onFailure(Exception e) {
                        // nothing now
                    }
                });
    }


    /**
     * 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) {
        mMap = googleMap;

        // Add a marker in Tokyo and move the camera
        LatLng tokyo = new LatLng(35.695056, 139.69885);
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(tokyo,13f));
        mMarker = mMap.addMarker(new MarkerOptions().position(tokyo).title("Marker"));
    }

    @Override
    protected void onPause() {
        super.onPause();
        mFusedClient.removeLocationUpdates(mLocCallback);
    }

    @Override
    protected void onResume() {
        super.onResume();
        startFusedLocation();
    }

}