Modification de l'icone par défaut de MyLocationOverlay

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package com.anis.telgps;

import java.util.ArrayList;
import java.util.List;

/*import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;*/
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.KeyEvent;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
//import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
//import com.google.android.maps.Projection;


public class userposition extends MapActivity implements LocationListener {
	TextView txtInfo;

	private MapView	mapView = null;;
	private  LocationManager lm = null;;
	private double lat = 0;
	 private double lng = 0;
	 private MapController  mc = null;
	// private Projection projection; 
	 @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(17);
    
     
  
    
	 }
	 
	 
	@Override
	protected boolean isRouteDisplayed() {
		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);
		 
		   MonOverlay object = new MonOverlay(getResources().getDrawable(R.drawable.map)) ;
		     object.addpoint(p);
		     mapView.getOverlays().add(object);	
		     mapView.setTraffic(true);
		     mapView.setSatellite(true);
		    

	}
	

	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
		
	}
	
	public class MonOverlay extends ItemizedOverlay<OverlayItem>{
		List<GeoPoint> points = new ArrayList<GeoPoint>();		

		public MonOverlay(Drawable defaultMarker) {
			super(boundCenterBottom(defaultMarker));
			// TODO Auto-generated constructor stub
		}

		@Override
		protected OverlayItem createItem(int i) {
			GeoPoint point = points.get(i);
			
			return new OverlayItem(point,"Titre","description");
		}

		@Override
		public int size() {
			
			return points.size();
		}
		public void addpoint(GeoPoint point){
			this.points.add(point);
			populate();
		}
		
	}
}