I'm working on an android application, and I have a drawable that I'm loading 
up from a source image. On this image, I'd like to convert all of the white 
pixels to a different color, say blue, and then cache the resultant Drawable 
object so I can use it later.

So for example say I have a 20x20 PNG file that has a white circle in the 
middle, and that everything outside the circle is transparent. What's the best 
way to turn that white circle blue and cache the results? Does the answer 
change if I want to use that source image to create several new Drawables (say 
blue, red, green, orange, etc)?

I'm guessing that I'll want to use a ColorMatrix in some way, but I'm not sure 
how.

Thanks

Matt

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