How to clear / reset an ItemizedOverlay in Android?

Question

I have a program that is creating an ItemizedOverlay and a map. Everything works fine upon startup.

When you close ande re-open the app, I am using onRestart() to get u

Answer 1

You create your own ItemizedOverlay sublcass when using a MapView. You can add a clear() method if you want.

Answer 2

A typical custom overlay looks like this. it encapsulates the various OverlayItems displayed on the map in a list.

public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem>{

    private List<OverlayItem> mOverlays = new ArrayList<OverlayItem>();

    public MyItemizedOverlay(Drawable defaultMarker) {
        super(boundCenterBottom(defaultMarker));        
    }

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

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

    public void removeOverlay(OverlayItem overlay) {
        mOverlays.remove(overlay);
        populate();
    }


    public void clear() {
        mOverlays.clear();
        populate();
    }

    @Override
    public int size() {
        return mOverlays.size();
    }
}

Methods can be exposed to add / remove individual overlayitems, but also the remove all overlayitems (clear method).

Remove a single overlayitem

MyItemizedOverlay sitesOverlay =  (MyItemizedOverlay ) map.getOverlays().get(0);
sitesOverlay.removeOverlay(overlay);

Add a single overlayItem

MyItemizedOverlay sitesOverlay =  (MyItemizedOverlay ) map.getOverlays().get(0);
sitesOverlay.addOverlay(new OverlayItem(p, "title", "snippet"));

Remove all overlayItems

MyItemizedOverlay sitesOverlay =  (MyItemizedOverlay ) map.getOverlays().get(0);
sitesOverlay.clear();