Manipulating overlays over Google maps v2 in android application

Question

I'm trying to create android application uses Google maps API v2 and put overlay on map that contains bitmap. I used addGroundOverlay method which attaches bitmap to the overlay. But when new position comes from LocationManager I would like to modify bitmap (erase something and draw something else). There is one problem because according to the specification when I drew the bitmap on overlay I can't modify it. So I remove overlay and add it again with manipulated bitmap:

public void draw(Bitmap modifiedBmp) {
    if (overlay != null) {
        overlay.remove();
    }

    BitmapDescriptor descriptor = BitmapDescriptorFactory.fromBitmap(modifiedBmp);
overlay = map.addGroundOverlay(new GroundOverlayOptions().image(descriptor).positionFromBounds(bounds).zIndex(100));

}

Bitmap is previously modfied using

p.setXfermode(new PorterDuffXfermode(Mode.CLEAR));

to erase some area of the bitmap and draw another one

But that solution has weak performance and what is worse bitmap reloading is visible on the map. Can someone indicate better solution for that problem?

Can you be more specific on the problem? Code and `something`s you want to draw can help. — MaciejGórski, Jul 14 '13 at 20:38

score -3 · Answer 1 · answered Jul 15 '13 at 06:33

Try this code

private void drawMarker() {

        if (googleMap != null) {
            googleMap.clear();

            double lati = 25.16828;
            double longi = 55.28818;
            LatLng dest = new LatLng(lati, longi);              

            MarkerOptions options = new MarkerOptions();
            options.position(dest);
            options.title("title here")
                    .snippet("")
                    .icon(BitmapDescriptorFactory
                            .fromResource(R.drawable.icon_blue));

            googleMap.addMarker(options);

        }       

}

Manipulating overlays over Google maps v2 in android application

1 Answers1