Marqueur sur la carte Google Maps

bonjour,
je vais afficher une marqueur à chaque fois que je deplace càd chaque fois que je deplace la marqueur se positionne sur la nouvelle place comment faire ???
voila ma code:
Code:
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package com.anis.telgps;
 
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
 
import android.location.LocationManager;
 
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.Toast;
 
 
public class userposition extends MapActivity implements LocationListener {
	private MapView	mapView = null;;
	private  LocationManager lm = null;;
	private double lat = 0;
	 private double lng = 0;
	 private MapController  mc = null;
 
	 @Override
	 public void onCreate(Bundle savedInstanceState) {
	 super.onCreate(savedInstanceState);
	 setContentView(R.layout.userposition);
	 mapView = (MapView) this.findViewById(R.id.mapView);
     mapView.setBuiltInZoomControls(true);
     lm = (LocationManager) this.getSystemService(LOCATION_SERVICE);
     lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 0, this);
     lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 10000, 0, this);
     mc = mapView.getController();
     mc.setZoom(12);
 
	 }
 
	@Override
	protected boolean isRouteDisplayed() {
		// TODO Auto-generated method stub
		return false;
	}
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event)
	{
		if (keyCode == KeyEvent.KEYCODE_S)
		{
			mapView.setSatellite(!mapView.isSatellite());
			return true;
		}
		return super.onKeyDown(keyCode, event);
}
 
	public final  void onLocationChanged(Location location)
	{
		lat = location.getLatitude();
		 lng = location.getLongitude();
		 Toast.makeText(getBaseContext(),
		 "Place change à : Latitude = " + lat + " Longitude = " + lng,
		 Toast.LENGTH_SHORT).show();
		 GeoPoint p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
		 mc.animateTo(p);
		 mc.setCenter(p);
 
 
 
 
 
 
	}
 
	public void onProviderDisabled(String provider) {
		// TODO Auto-generated method stub
 
	}
 
	public void onProviderEnabled(String provider) {
		// TODO Auto-generated method stub
 
	}
 
	public void onStatusChanged(String provider, int status, Bundle extras) {
		// TODO Auto-generated method stub
 
	}
}