title: Button drop shadow on all sides in Android
body: <p>I would like to make my button shadow look like this:
  <a href="https://i.stack.imgur.com/BX4lY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BX4lY.png" alt="Desired shadow"></a></p>
  
  <p>So far i tried several approaches, e.g. with a layer-list and a gradient, but i wasn't really successful so far.
  Does anyone know how to achieve this? Any help will be very much appreciated!</p>