Hello,
I am painting on the map overlay successively. Each time I want to
paint new information on the overaly, I call the Map.invalidate()
method and the Overlay.draw() method is calling fine and I am able to
paint the new information.

However, the problem is I want to not lose the stuff on the Overlay
canvas that I have already painted in previous calls. Currently, only
the new information is painted on map and none of the previous one.

I am thinking that Invalidate() clears the map completely. But don't
know for sure.

Thanks in advance
Hasan

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