Activité qui met à jour la position de l’appareil

Bonsoir
Voici l'exemple d'Activité qui met à jour la position de l’appareil sous Android :

public class MaPositionMaj extends Activity {
private LocationManager locationManager;
private String locationProvider = LocationManager.GPS_PROVIDER;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String locationContext = Context.LOCATION_SERVICE;
locationManager = (LocationManager) getSystemService(locationContext);
if (locationManager != null && locationProvider != null) {
majCoordonnes();
locationManager.requestLocationUpdates(locationProvider, 6000,
100, new MajListener());
}
}

public void majCoordonnes() {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("Fournisseurs:");
stringBuilder.append("\n");
stringBuilder.append(locationProvider);
stringBuilder.append(" : ");
Location location =
locationManager.getLastKnownLocation(locationProvider);
if (location != null) {
double latitude = location.getLatitude();
double longitude = location.getLongitude();
stringBuilder.append(latitude);
stringBuilder.append(", ");
stringBuilder.append(longitude);
} else {
stringBuilder.append("Non déterminée");
}
Log.d("MaPositionMaj", stringBuilder.toString());
}

class MajListener implements android.location.LocationListener {
public void onLocationChanged(Location location) {
majCoordonnes();
}
public void onProviderDisabled(String provider){
}
public void onProviderEnabled(String provider){
}
public void onStatusChanged(String provider, int status, Bundle extras){
}
};
}