How to add a blurred drop shadow to a button?

Question

I need to add blurred drop shadow to my button:

I tried to create background with layer-list xml drawable, but it not looks like blur.

Answer 1

I add this as background drawable (grey drop shadow):

Ensures the height/width/padding of textview large enough to contains above shadow 3dp (1dp+1dp+1dp for all colors from #3f000000 until #1f000000).