CODEWITHSUNDEEP
androiditemizedoverlay
bubbly
bubbly

Reputation: 493

Remove a specific GeoPoint from ItemizedOverlay?

I have a map with lots of points on it added to an ItemizedOverlay.

OverlayItem overlayItem = new OverlayItem(theGeoPoint, title, description);
itemizedOverlay.addOverlay(overlayItem);
mapOverlays.add(itemizedOverlay);

Is there a way to remove a specific point from the itemizedOverlay?

Example, say I've added lots of point at different latitudes/longitudes and I wish to remove a point at latitude: 32.3121212 and longitude: 33.1230912, which was added earlier.

How can I remove JUST that point??

I really need this so I hope someone can help.

Thanks.

Full story scenario (in case you have a different idea on how to solve this): Adding events to a map that are caught from a database. Now when events are deleted from the database, I wish to sync the map and remove just those which were deleted. (please don't suggest I re-download all points excluding the deleted ones even though I've thought of that but it isn't an option concerning what I want to do. :p)

Upvotes: 0

Views: 334

Answers (1)

goodm
goodm

Reputation: 7295

Create your MapOverlay with GeoPoints Array and override the draw function:

public class MapOverlay extends Overlay 
{

    private ArrayList<GeoPoints>points;
    ...


    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) 
    {
            super.draw(canvas, mapView, shadow);      
            int len = points.size();  
            if(len > 0)
            {
                for(int i = 0; i < len; i++)
                {
                   // do with your points whatever you want
                   // you connect them, draw a bitmap over them  and etc.
                   // for example:
                   Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.pointer);
                   mapView.getProjection().toPixels(points.get(i), screenPts);
                   canvas.drawBitmap(bmp, screenPts.x-bmp.getWidth()/2, screenPts.y - bmp.getHeight()/2, null);  
                } 
            }
    }

    public void addPoint(GeoPoint p)
    {
       // add point to the display array
    }

    public void removePointByIndex(int i)
    {
       points.remove(i);
    }

    public void removePointByCordinate(Double lat, Double lng)
    {
        int index = -1;
        int len = points.size();  
        if(len > 0)
        {
                for(int i = 0; i < len; i++)
                {
                     if((int)(lat*1E6) == points.get(i).getLatitudeE6() && (int)(lng*1E6) == points.get(i).getLongitudeE6())
                     {
                          index = i;
                     }
                } 
            }

            if(index != -1)
            {
                points.remove(index);
            }
        }
    }

    public void removePoint(GeoPoint p)
    {
        int index = -1;
        int len = points.size();  
        if(len > 0)
        {
                for(int i = 0; i < len; i++)
                {
                     if(p == points.get(i))
                     {
                          index = i;
                     }
                } 
            }

            if(index != -1)
            {
                points.remove(index);
            }
        }
    }

}

(I didn't test above class)

and then in your MapActivity class you can just:

MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setClickable(true);
MapOverlay mapOverlay = new MapOverlay();                       
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.add(mapOverlay);

Try google some GoogleMap tutorials and maybe you will find more solutions.

Upvotes: 4

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