無法在線程內調用任務

Question

我試圖在地圖上顯示多個針位置，即我的位置和從雲服務器獲得的另一個位置。

基於下面的代碼：

我不斷收到一個空指針錯誤消息時，我嘗試來標記我的字符串。這意味着我的CloudTask活動永遠不會被解僱....我無法弄清楚爲什麼Eclipse調試器不會通過線程...任何幫助表示讚賞。

public class MapsActivity extends com.google.android.maps.MapActivity { 
    private static final String TAG = null; 


    private MapController mapController; 
    private MapView mapView; 
    private LocationManager locationManager; 
    private MyOverlays itemizedoverlay; 
    private MyLocationOverlay myLocationOverlay; 
    private MyLocationOverlay otherLocationOverlay; 
    private Handler handler; 

    private String message; 
    StringTokenizer tokens; 

    Integer p1 = null; 
    Integer p2; 

    GeoPoint point; 
    static Context mContext = null; 

    public void onCreate(Bundle bundle) { 
     super.onCreate(bundle); 
     setContentView(R.layout.main); // bind the layout to the activity 


      // Configure the Map 
      mapView = (MapView) findViewById(R.id.mapview); 
      mapView.setBuiltInZoomControls(true); 
      mapView.setSatellite(true); 
      mapController = mapView.getController(); 
      mapController.setZoom(14); // Zoon 1 is world view 
      locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 


      locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2500, 
        0,(LocationListener) new GeoUpdateHandler()); 
        //new Intent("android.intent.action.LOCATION_CHANGED"); 
        //(LocationListener) new GeoUpdateHandler()); 

      myLocationOverlay = new MyLocationOverlay(this, mapView); 


      mapView.getOverlays().add(myLocationOverlay); 


      handler = new Handler(); 
     // new AsyncTask<Void, Void, String>() { 
      myLocationOverlay.runOnFirstFix(new Runnable(){ 
      public void run(){ 



        MyRequestFactory requestFactory = Util.getRequestFactory(mContext, 
          MyRequestFactory.class); 
        final CloudTask1Request request = requestFactory.cloudTask1Request(); 
        Log.i(TAG, "Sending request to server"); 


        request.queryTasks().fire(new Receiver<List<TaskProxy>>() { 


         @Override 
         public void onSuccess(List<TaskProxy> taskList) { 
          //message = result; 


          message = "\n"; 

          for (TaskProxy task : taskList) { 

           message += task.getId()+","+task.getNote()+",";         

          } 


         } 
        }); 
        //return message; 
       //} 



         if(message.length() == 0){ 

          Log.i("MESSAGE","Did not get any points from cloud"); 
         } 

        tokens = new StringTokenizer(message,","); 


        tokens.nextToken(); 
        p1 = Integer.parseInt(tokens.nextToken()); 
        p2 = Integer.parseInt(tokens.nextToken()); 
        point = new GeoPoint(p1,p2); 

        mapView.getController().animateTo(point); 


     } 


    }); 

      Drawable drawable = this.getResources().getDrawable(R.drawable.pushpin); 
       itemizedoverlay = new MyOverlays(this, drawable); 
       createMarker(); 

      myLocationOverlay.runOnFirstFix(new Runnable() { 
       public void run() { 
        mapView.getController().animateTo(
          myLocationOverlay.getMyLocation()); 
       } 
      }); 

      //Drawable drawable = this.getResources().getDrawable(R.drawable.pushpin); 
      itemizedoverlay = new MyOverlays(this, drawable); 
      createMarker(); 


    } 




    @Override 
    protected boolean isRouteDisplayed() { 
     return false; 
    } 

    public class GeoUpdateHandler implements LocationListener { 

     @Override 
     public void onLocationChanged(Location location) { 
      int lat = (int) (location.getLatitude() * 1E6); 
      int lng = (int) (location.getLongitude() * 1E6); 
      GeoPoint point = new GeoPoint(lat, lng); 
      createMarker(); 
      mapController.animateTo(point); // mapController.setCenter(point); 

     } 

     @Override 
     public void onProviderDisabled(String provider) { 
     } 

     @Override 
     public void onProviderEnabled(String provider) { 
     } 

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


    } 

    private void createMarker() { 
     GeoPoint p = mapView.getMapCenter(); 
     OverlayItem overlayitem = new OverlayItem(p, "", ""); 
     itemizedoverlay.addOverlay(overlayitem); 
     if (itemizedoverlay.size() > 0) { 
      mapView.getOverlays().add(itemizedoverlay); 
     } 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     myLocationOverlay.enableMyLocation(); 
     myLocationOverlay.enableCompass(); 
    } 

    @Override 
    protected void onPause() { 
     super.onResume(); 
     myLocationOverlay.disableMyLocation(); 
     myLocationOverlay.disableCompass(); 
    } 


} 

Answer 1

把這些內部的onSuccess（）

if(message.length() == 0){ 

    Log.i("MESSAGE","Did not get any points from cloud"); 
} 

tokens = new StringTokenizer(message,","); 


tokens.nextToken(); 
p1 = Integer.parseInt(tokens.nextToken()); 
p2 = Integer.parseInt(tokens.nextToken()); 
point = new GeoPoint(p1,p2); 

mapView.getController().animateTo(point);