How to make an overlapped image clickable in android?

I have a image of a map and i want t开发者_JS百科o plot some points/markers on the map. These markers must be clickable. I have used a custom view class to plot the markers at my required points.The markers are getting plotted but the problem is that either the marker is not clickable or when i set onClick listener on the custom view,the whole image receives the click event(whereever i click on image, onClick is called,but i want only click on the marker to initiate onClick). Can someone please help me with this?

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You have to create your custom MapOverlay and inside put the code the function. In this code above, Override the OnTap method.

  public class MapOverlay extends ItemizedOverlay {

private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;

public MapOverlay(Drawable defaultMarker,Context context) {
    super(boundCenterBottom(defaultMarker));
    mContext = context;
}

@Override
protected OverlayItem createItem(int i) {
    // TODO Auto-generated method stub
    return mOverlays.get(i);
}

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

public void clearOverlay() {
    mOverlays.clear();
    populate();
}
@Override
public int size() {
    // TODO Auto-generated method stub
    return mOverlays.size();
}



@Override
protected boolean onTap(int index) {
  OverlayItem item = mOverlays.get(index);
  AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
  dialog.setTitle(item.getTitle());
  dialog.setMessage(item.getSnippet());
  dialog.show();
  return true;
}

}