Android Tutorial: Geolocation of the user's phone on a GoogleMap V2 through a Marker

Geolocation of the  phone on a GoogleMap

In a previous tutorial we learned how to integrate Google Maps V2 in an application.
This article is a continuation of the previous tutorial and could be performed only after completing the work presented in this tutorial: Integrating Google Map V2 in an Android app with Android Studio .
Now after integrating the Map. we will learn :

how to geo-locate the user's device on the Map through a marker. 

To geo-locate the user we must implement the interface OnLocationListener. The code of our activity will explain better:

public class Map extends AppCompatActivity implements LocationListener{
LocationManager l;
    GoogleMap gMap;
    Marker marker;
    String providerFine;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map);

        gMap = ((MapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
        marker=gMap.addMarker((new MarkerOptions().title("Vous êtes ici")
                .position(new LatLng(0,0))));

    }
public void getLocation()
{
    l=(LocationManager) getSystemService(LOCATION_SERVICE);
     Criteria criteria = new Criteria();
    criteria.setAltitudeRequired(false);
    criteria.setBearingRequired(false);
    criteria.setCostAllowed(false);
    criteria.setPowerRequirement(Criteria.POWER_LOW);
   
  //  criteria.setAccuracy(Criteria.ACCURACY_FINE);
     providerFine = l.getBestProvider(criteria, true);


l.requestLocationUpdates(providerFine,0,20,this);
}
    @Override
    protected void onResume() {
        super.onResume();
        getLocation();
    }

    @Override
    public void onLocationChanged(Location location) {

            gMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), 8));

        //    marker.setPosition(new LatLng(location.getLatitude(), location.getLongitude()));

        marker.setPosition(new LatLng(location.getLatitude(), location.getLongitude()));
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {
       getLocation();
    }

    @Override
    public void onProviderDisabled(String provider) {
    l.removeUpdates(this);
    }
}

Finally do not forget to add the following two permissions to your manifest.xml :
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>