Android Maps NullPointerException ItemizedOverlay

Question

Cela ne se réfère à aucun endroit dans mon code du tout. Comment puis-je aller au fond des choses?

java.lang.NullPointerException 
at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:42) 
at com.google.android.maps.MapView.onDraw(MapView.java:494) 
at android.view.View.draw(View.java:6739) 
at android.view.ViewGroup.drawChild(ViewGroup.java:1648) 
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1375) 
at android.view.ViewGroup.drawChild(ViewGroup.java:1646) 
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1375) 
at android.view.View.draw(View.java:6742) 
at android.widget.FrameLayout.draw(FrameLayout.java:352) 
at android.view.ViewGroup.drawChild(ViewGroup.java:1648) 
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1375) 
at android.view.View.draw(View.java:6742) 
at android.widget.FrameLayout.draw(FrameLayout.java:352) 
at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1872) 
at android.view.ViewRoot.draw(ViewRoot.java:1422) 
at android.view.ViewRoot.performTraversals(ViewRoot.java:1167) 
at android.view.ViewRoot.handleMessage(ViewRoot.java:1744) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:144) 
at android.app.ActivityThread.main(ActivityThread.java:4937) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:521) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
at dalvik.system.NativeStart.main(Native Method) 

Voici la méthode de tirage de la ItemizedOverlay

public void draw(Canvas canvas, MapView mapView, boolean shadow) { 

      try { 
      super.draw(canvas, mapView, false); 

      if (getMainOverlayArray().size() != 0){ 

      pfOverlayItem tempOver = null; 
      for (int i = 0; i < getMainOverlayArray().size(); i++) { 

       tempOver = getMainOverlayArray().get(i); 

      boolean isMatch = false; 

      if (tempOver.getTitle().equals(selectedName)) 
      { 
       isMatch = true; 
      } 

      if (isMatch){ 

      Projection projection = mapView.getProjection(); 
      Point point = new Point(); 
      projection.toPixels(tempOver.getPoint(), point); 

      Paint background = new Paint(); 
      background.setColor(Color.WHITE); 
      background.setAlpha(150); 
      RectF rect = new RectF(); 
      rect.set(point.x - 55, point.y +15, 
        point.x + 100, point.y + 65); 
      canvas.drawRoundRect(rect, 5, 5, background); 


      Paint text = new Paint(); 
      text.setAntiAlias(true); 
      text.setColor(Color.BLUE); 
      text.setTextSize(14); 
      text.setTypeface(Typeface.MONOSPACE); 

      canvas.drawText(tempOver.getTitle() , point.x -50 , point.y + 30, text); 
      canvas.drawText(tempOver.getTypeTextOut(), point.x -50 , point.y + 45, text); 
      canvas.drawText(tempOver.getdestination(), point.x -50 , point.y + 60, text); 
      } 
      } 
      } 
      }catch (Exception e){ 
       Log.e("Error", "Problem drawing view", e); 
       e.printStackTrace(); 
      } 
     } 

imprimer maintenant le stacktrace et aucune différence! :-(

Est-ce que quelqu'un a des idées qui pourraient aider à aller au fond de cette

EDIT - dernier code 28/11 CLASSE COMPLET

private class SitesOverlay extends ItemizedOverlay<pfOverlayItem> { 
     private List<pfOverlayItem> items = new ArrayList<pfOverlayItem>(); 

     private PopupPanel panel=new PopupPanel(R.layout.popup); 
     private MapLocation selectedMapLocation; 
     private static final int CIRCLERADIUS = 2; 
     private ArrayList<pfOverlayItem> mOverlays = new ArrayList<pfOverlayItem>(); 



     public SitesOverlay() { 

      super(null); 
      //super(boundCenter(defaultMarker)); 
      //items = getMainOverlayArray(); 
      //items = mOverlays; 
      populate(); 

     } 



public void finishedLoading(){ 

    populate(); 

} 

     @Override 
     protected pfOverlayItem createItem(int i) { 
      // Log.i("CREATE","MARKER"); 
      return (items.get(i)); 

     } 

     public void addItem(OverlayItem overlay) { 
      overlay.setMarker(boundCenter(overlay.getMarker(0))); 
      items.add((pfOverlayItem) overlay); 
      //populate(); 
     } 

     public void clearItems(){ 
      runOnUiThread(new Runnable() { 
       public void run() { 
        items.clear(); 
        myMapView.invalidate(); 
       } 
      }); 


     } 

     public void clear() { 
      mOverlays.clear(); 
      myMapView.removeAllViews(); 
      //numItems = 0; 
      // Workaround for another bug with this class: 
      // http://groups.google.com/group/android-developers/browse_thread/thread/38b11314e34714c3 
      setLastFocusedIndex(-1); 
      populate(); 
     } 

     @Override 
     public void draw(Canvas canvas, MapView mapView, boolean shadow) { 
      super.draw(canvas, mapView, false); 

      try { 


      if (getMainOverlayArray().size() != 0){ 

      pfOverlayItem tempOver = null; 
      for (int i = 0; i < getMainOverlayArray().size(); i++) { 

       tempOver = getMainOverlayArray().get(i); 

      boolean isMatch = false; 

      //Log.i("Selected Name",selectedName); 

      if (tempOver.getTitle().equals(selectedName)) 
      { 
       isMatch = true; 
      } 

      if (isMatch){ 

      Projection projection = mapView.getProjection(); 
      Point point = new Point(); 
      projection.toPixels(tempOver.getPoint(), point); 

      Paint background = new Paint(); 
      background.setColor(Color.WHITE); 
      background.setAlpha(150); 
      RectF rect = new RectF(); 
      rect.set(point.x - 50, point.y +15, 
        point.x + 90, point.y + 50); 
      canvas.drawRoundRect(rect, 5, 5, background); 


      Paint text = new Paint(); 
      text.setAntiAlias(true); 
      text.setColor(Color.BLUE); 
      text.setTextSize(14); 
      text.setTypeface(Typeface.MONOSPACE); 

      //canvas.drawRoundRect(rect, 2, 2, background); 
      canvas.drawText(tempOver.getTitle() + " " + tempOver.getcallsign(), point.x -50 , point.y + 30, text); 
      canvas.drawText(tempOver.getdestination() + " " + tempOver.getdraft(), point.x -50 , point.y + 45, text); 
      } 
      } 
      } 
      }catch (Exception e){ 
       Log.e("Error", "Problem drawing view", e); 
       e.printStackTrace(); 

      } 
     } 

     @Override 
     protected boolean onTap(int i) { 

      pfOverlayItem item = getItem(i); 

      if (selectedName.equals(item.getTitle())){ 

       //Toast.makeText(PlaneFinderMain.this, "SECOND MOFO PRESS", 3000).show(); 
       try{  
       Intent myIntent = new Intent(PlaneFinderMain.this, DetailActivity.class); 
       myIntent.putExtra("int", i); 
       myIntent.putExtra("string", selectedName); 
       PlaneFinderMain.this.startActivity(myIntent); 
       }catch (Exception e){ 
        Log.e("Error", "Cannot launch", e); 
       } 
      } 

      currentadshex = item.getmmsi(); 
      new GetRouteTask(item.getmmsi()).execute(); 

      selectedItem = i; 
      selectedName = item.getTitle(); 
      selectedPlanePoint = item.getPoint(); 

      GeoPoint geo=item.getPoint(); 
      Point pt=myMapView.getProjection().toPixels(geo, null); 

      View view=panel.getView(); 

      ((TextView)view.findViewById(R.id.reg)).setText(item.getTitle()); 
      ((TextView)view.findViewById(R.id.flightno)).setText(item.getcallsign()); 
      ((TextView)view.findViewById(R.id.route)).setText(item.getdestination()); 
      ((TextView)view.findViewById(R.id.height)).setText(item.getdraft()); 

      return (true); 
     } 

     @Override 
     public boolean onTouchEvent(MotionEvent event, MapView mapView) { 

      if (event.getAction() == MotionEvent.ACTION_DOWN){ 

       if (selectedPlanePoint != null){ 
        Projection projection = mapView.getProjection(); 
        Point point = new Point(); 
        projection.toPixels(selectedPlanePoint, point); 

        Point pointHit = new Point(); 
        pointHit.x=(int)event.getX(); 
        pointHit.y=(int)event.getY(); 

        if ((point.x - pointHit.x) >-100 && (point.x - pointHit.x) <70 && (point.y - pointHit.y) < -25 && (point.y - pointHit.y) > -95){ 

          try{  
           Intent myIntent = new Intent(PlaneFinderMain.this, DetailActivity.class); 

            myIntent.putExtra("int", selectedItem); 
            myIntent.putExtra("string", selectedName); 
            PlaneFinderMain.this.startActivity(myIntent); 

           }catch (Exception e){ 
            Log.e("Error", "Cannot launch", e); 
           } 

        }else{ 

        } 


       } 


      } 



      return false; 


     } 



     @Override 
     public int size() { 
      return (items.size()); 
     } 

     public void addOverlay(OverlayItem o){ 
      setLastFocusedIndex(-1); 
      populate(); 
     } 



    } 

Answer 1

En fait, le problème ne réside pas dans l'implémentation de votre ItemizedOverlay, mais dans l'implémentation de votre MapActivity. Comme vous pouvez le voir à partir d'une trace de pile similaire here à la ligne 42, OverlayBundle appelle la méthode draw() d'une superposition. Cela pointe vers une superposition nulle que vous avez ajoutée à votre mapView quelque part.

Quelques conseils utiles: vous devriez certainement passer un drawable à votre constructeur super (utilisé des essais à succès) par décommentant la première ligne de code que vous avez déjà là:

 public SitesOverlay() { 

     //super(null); 
     super(boundCenter(defaultMarker)); 
     //items = getMainOverlayArray(); 
     //items = mOverlays; 
     populate(); 

    } 

et potentiellement pas appeler super.draw() dans votre méthode draw().

@Override 
    public void draw(Canvas canvas, MapView mapView, boolean shadow) { 
     // why do you do this if you paint it yourself later on. 
     super.draw(canvas, mapView, false 

Très probablement, vous devrez réellement faire les deux.

Editer: Pensez-y, vous devriez certainement passer un dessinable à votre super constructeur car il est utilisé pour les tests d'impact. Modifié le texte ci-dessus pour refléter cela.

Answer 2

pfOverlayItem tempOver = null; 
      for (int i = 0; i < getMainOverlayArray().size(); i++) { 

       tempOver = getMainOverlayArray().get(i); 
boolean isMatch = false; 

      if (tempOver.getTitle().equals(selectedName)) 
      { 
       isMatch = true; 
      } 

Est-tempOver pas être affecté

canvas.drawText(tempOver.getTitle() , point.x -50 , point.y + 30, text); 
      canvas.drawText(tempOver.getTypeTextOut(), point.x -50 , point.y + 45, text); 
      canvas.drawText(tempOver.getdestination(), point.x -50 , point.y + 60, text); 

est tempOver.getTitle(), .getTypeTex tOut() ou .getdestination() null?