gps를 이용해서 이동경로를 선으로 그을려고 하는데, 똑같은 좌표를 가지고도 , drawLine()은 그려지고 drawPath는 안그려지네요..

왜그럴까요?? ㅠㅠ

public class traceOverlay extends MyLocationOverlay (제가 만든 오버레이 클래스입니다.)

{

MapView _mapview;
 Context _context;
 
 Path path;
 
 GeoPoint startPoint;
 Point P_startPoint;
 GeoPoint endPoint;
 Point P_endPoint;
 
 
 public traceOverlay(Context context, MapView mapView)
 {
  
  super(context, mapView);
  
     _context = context;
     _mapview = mapView;
          
     if(super.getMyLocation()!=null)
         startPoint=super.getMyLocation();
        else
         startPoint=new GeoPoint ((int)(35.86060548139674*1E6),(int)(128.52770182270893*1E6));
   
 }

 public boolean draw(Canvas canvas, MapView mapView, boolean shadow,long when)
 {
  super.draw(canvas, mapView, shadow);
  
  path =new Path();   
    
     P_startPoint=new Point();
     P_endPoint=new Point();
     
  
  Paint paint1=new Paint();
  

  paint1.setAntiAlias(true);
     paint1.setDither(true);
     paint1.setColor(Color.RED);
     paint1.setStyle(Paint.Style.STROKE);
     paint1.setStrokeJoin(Paint.Join.ROUND);
     paint1.setStrokeCap(Paint.Cap.ROUND);
     paint1.setStrokeWidth(3);
     paint1.setStyle(Paint.Style.FILL);
  
  mapView.getProjection().toPixels(startPoint, P_startPoint);
  
  if(endPoint!=null)
  mapView.getProjection().toPixels(endPoint, P_endPoint);
  else
  {
   P_endPoint=P_startPoint;
  }
 
  
     path.moveTo(P_startPoint.x,P_startPoint.y);
     path.lineTo( P_endPoint.x,P_endPoint.y);

  
   
     canvas.drawLine(P_startPoint.x, P_startPoint.y, P_endPoint.x,P_endPoint.y, paint1); (이부분에서 똑같은 경로를 가지고 drawLine()과 drawPath를 했을때, drawLine()은 그려지고 drawPath()로 했을때는 안그려지네요..)
     canvas.drawPath(path,paint1);
  
  return shadow;
 }
 
  public void onLocationChanged(Location location){
  
    super.onLocationChanged(location);
  
      endPoint=new GeoPoint((int)(location.getLatitude()*1E6),(int)(location.getLongitude()*1E6));
      
      //P_startPoint=P_endPoint;
      
  }

}