How to add overlay which changes size/position along with zoom and position

Issue

I have been searching for solution on this problem for a couple of days now. I want to add a image as an overlay(or whatever is the best solution). The image visualize a part of the map but with it's own graphics. So it's important that it scales, positions and behaves as if it were a part of the map.

The image is quite large(800x1200) so maybe it can be an advantage to use som type of tilebased solution.

Solution

I found a solution!! (http://groups.google.com/group/android-developers/browse_thread/thread/79b233ab9ec64e1e#)

I am using a overlay and in the draw method i do this.

public void draw(Canvas canvas, MapView mapView, boolean shadow) {
        if(shadow){
       return;
    }

    super.draw(canvas, mapView, shadow);

    // convert bitmap's bounding box into pixels 
        Point top_left = new Point(); 
        mapView.getProjection().toPixels(topLeft, top_left); 
        Point bottom_right = new Point(); 
        mapView.getProjection().toPixels(bottomRight, bottom_right); 
        // Prepare two rectangles (pixels) 
        Rect src = new Rect( 0,0,bmp.getWidth() - 1, bmp.getHeight() - 1 ); 
        Rect dst = new Rect( top_left.x, top_left.y, bottom_right.x,bottom_right.y ); 

        // draw bitmap 
        canvas.drawBitmap(bmp, src, dst, null); 


}

// I set the geoPoints (geoPointTopLeft,geoPointBottomRight) of the picture in the constructor

Answered By - Jonas Törnqvist