Hi,

I have a map in my android application that shows many markers (~20-50). But the app performs very poor when i try to scroll/zoom (in Google Android Maps i did a sample search for pizza and there were also some 20-50 results found and i didn't notice any particular performance problems when zooming/scrolling through the map).

Here is my (pseudo)code:

onCreate() {
    ....
    drawable = this.getResources().getDrawable(R.drawable.marker1);
    itemizedOverlay = new MyItemizedOverlay(drawable,mapView);
    ...
    callWebServiceToRetrieveData();

    createMarkers();
}

createMarkers(){
    for(elem:bigList){
        GeoPoint geoPoint = new GeoPoint((int)(elem.getLat()*1000000), (int) (elem.getLon()*1000000));
        OverlayItem overlayItem = new OverlayItem(geoPoint, elem.getName(), elem.getData());
        itemizedOverlay.addOverlay(overlayItem);

        mapOverlays.add(itemizedOverlay);
}
mapView.invalidate();

}

the MyItemizedOverlay.addOverlay looks like this:

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