Is there a way to set drawable's Alpha using XML?

Question

Easy like itself . I wanna make an alpha button , which would have a selected drawable this way:

Answer 1

It's been a while since the OP, but personally found a solution that worked a lot better for me than the suggested answers. Creating a BitmapDrawable makes is easily possible to set the alpha:

Alpha can be any value between 0 and 255. Note that it is sort of the inverse of the HEX color value alpha, as for example 70% alpha would be B3 in HEX and 77 in the BitmapDrawable.