I am struggling with drawing on my custom View. I can make it all work
but just not very efficiently. I am using invalidate causing the
entire screen to be redrawn. I only need to redraw a small portion of
the screen. I tried calling invalidate with a rectangle but that left
everything else black. I don't know what is causing everything else to
go black if I only invalidated a small rectangle.

I see many posts on these similar issues and think that everybody
would have a much better experience if there was a 2D scene graph API
for android. Then I can just worry about my scene primitive attributes
and let the scene graph engine handle all the drawing in the most
efficient way possible.

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