Hi,

I've been reading the (shoddy) documentation for the Google Maps API
(MapActivity et al), and I think I have roughly worked out how it
works. It seems that if you want to add a marker overlay you can use
ItemizedOverlay easily, but you have to add all your markers at once.

What I want to do is query markers from an online database as the user
pans around (in the same way the actual map tiles are fetched). Is
there a simple way to do this?

As far as I can tell I need to subclass Overlay and implement the draw
method, but where is the best place to put the code that fetches new
markers when the map is panned? There doesn't seem to be an
onMapChanged() method anywhere. My best guess is MapController.onKey()
but that seems wrong.

Any suggestions?

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