How can I blur and dim an image to be used as an activity background?

Like the title says: I want to blur and darken a downloaded image.

开发者_运维技巧The BlurMaskFilter in the SDK sounds relevant, but I can't find any documentation on it.

Any suggestions?

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I've only used this once and just for fun (not an expert). Try something like:

paint.setMaskFilter(new BlurMaskFilter(20, Blur.OUTER));

for more there is a nice blog here.