adding multiple marker on google map in android

Question

I am triyng to add multiple marker on google map. Here is my code section

public class GoogleMap extends MapView 
 {
     MapController mc;
     MapView mapView; 
     GeoPoint p; 

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
    ....

         double lat = Double.parseDouble(bundle.getString("paramLat"));
         double lng = Double.parseDouble(bundle.getString("paramLong"));

         mc = mapView.getController();
         p = new GeoPoint( (int) (lat * 1E6),  (int) (lng * 1E6));
         mc.animateTo(p);
         mc.setZoom(17);

         //---Add a location marker---
         MapOverlay mapOverlay = new MapOverlay();
         List<Overlay> listOfOverlays = mapView.getOverlays();
         listOfOverlays.clear();
         listOfOverlays.add(mapOverlay);    

         mapView.invalidate();
  }




class MapOverlay extends com.google.android.maps.Overlay
    {

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


                //---translate the GeoPoint to screen pixels---
                    Point screenPts = new Point();
                    mapView.getProjection().toPixels(p, screenPts);

                   //---add the marker---
                   Bitmap bmp = BitmapFactory.decodeResource(getResources(),  R.drawable.pushpin);            
                   canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);     


                   return true;



         }
}

I have two question here. When i tried to add only one marker, it works but draw method is invoked many times. But why? and when is it invoked?

The second question is how can i add new marker. I created second geoPoint named p2 and after that what should i do? Thank you very much.

Answer 1

I have implemented the multiple markers in my project. Here is the sample code; some things that you need to change is the marker image, the length (number of marker you want define in the for loop). Hope this will help!!!

public class ShowMapActivity extends MapActivity{
    private MapController mapControll;
    private GeoPoint geoPoint=null;
    private MapView mapview;
    private MyItemizedOverlay userPicOverlay;
    private MyItemizedOverlay nearPicOverlay;
    private Drawable userPic,atmPic;
    private OverlayItem nearatms[] = new OverlayItem[50];
    public static Context context;

    @Override
    protected void onCreate(Bundle icicle) {
        // TODO Auto-generated method stub
        super.onCreate(icicle);
        context = getApplicationContext();
        setContentView(R.layout.your layout xml);
        showMap();
    }

    public void showMap() {
        // TODO Auto-generated method stub

        try {
            geoPoint = new GeoPoint((int)(latitude * 1E6),(int)(longitude * 1E6));          
            mapview = (MapView)findViewById(R.id.mapview);
            mapControll= mapview.getController();
            mapview.setBuiltInZoomControls(true);
            mapview.setStreetView(true);
            mapControll.setZoom(16);
            mapControll.animateTo(geoPoint);

            userPic = this.getResources().getDrawable(R.drawable.your pic);
            userPicOverlay = new MyItemizedOverlay(userPic);
            OverlayItem overlayItem = new OverlayItem(geoPoint, "I'm Here!!!", null);
            userPicOverlay.addOverlay(overlayItem);
            mapview.getOverlays().add(userPicOverlay);


            atmPic = this.getResources().getDrawable(R.drawable.your pic);
            nearPicOverlay = new MyItemizedOverlay(atmPic);
            for (int i = 0; i < define your length here; i++) {
                nearatms[i] = new OverlayItem(new GeoPoint((int)((latitude) * 1E6)),(int)(longitude) * 1E6)),"Name", null);//just check the brackets i just made change here so....
                nearPicOverlay.addOverlay(nearatms[i]);
            }
            mapview.getOverlays().add(nearPicOverlay);
            //Added symbols will be displayed when map is redrawn so force redraw now
            mapview.postInvalidate();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub
        return false;
    }

}

Itemized Class for placing the marker

public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {

    private ArrayList<OverlayItem> myOverlays ;

    public MyItemizedOverlay(Drawable defaultMarker) {
        super(boundCenterBottom(defaultMarker));
        myOverlays = new ArrayList<OverlayItem>();
        populate();
    }

    public void addOverlay(OverlayItem overlay){
        myOverlays.add(overlay);
        populate();
    }

    @Override
    protected OverlayItem createItem(int i) {
        return myOverlays.get(i);
    }

    // Removes overlay item i
    public void removeItem(int i){
        myOverlays.remove(i);
        populate();
    }

    // Returns present number of items in list
    @Override
    public int size() {
        return myOverlays.size();
    }


    public void addOverlayItem(OverlayItem overlayItem) {
        myOverlays.add(overlayItem);
        populate();
    }


    public void addOverlayItem(int lat, int lon, String title) {
        try {
            GeoPoint point = new GeoPoint(lat, lon);
            OverlayItem overlayItem = new OverlayItem(point, title, null);
            addOverlayItem(overlayItem);    
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
    }

    @Override
    protected boolean onTap(int index) {
        // TODO Auto-generated method stub
        String title = myOverlays.get(index).getTitle();
        Toast.makeText(ShowMapActivity.context, title, Toast.LENGTH_LONG).show();
        return super.onTap(index);
    }
}