The easiest way to do that is use a library. Take a look at this one: https://github.com/wasabeef/Blurry
With the library you only need to do this:
Blurry.with(context)
.radius(10)
.sampling(8)
.color(Color.argb(66, 255, 255, 0))
.async()
.onto(rootView);
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