I don't believe that you can just pass the KML file to maps, at least
I have not seen a way to do this.

I am currently doing something similar, and I think you will need to
draw the polygon manually on the canvas.

As I'm approaching the problem, the individual OverlayItem (or child
class derived from it) will need to draw itself based on the
coordinates of the polygon.  This means that the ItemizedOverlay (or
child class derived from it) will need to pass the Canvas, MapView and
parameters down to the individual OverlayItem for doing the draw
(rather than just calling "super" and being done with it).

You should be able to set the Alpha channel of the polygon during the
draw to, that's just a factor of the Paint object used during it's
construction.

Good luck,
DD

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