title: android button with double border and gradient
body: <p>I want to create a custom button.
  This button should have a gradient and a two pixel border, but the inner and outer edge should be in a different color (example: inner is red and outer is yellow).</p>
  
  <p>My question: how do I program the double border (like in the image)?!</p>
  
  <p>Image:</p>
  
  <p><img src="https://i.stack.imgur.com/IeUGs.png" alt="Example Button Image"></p>
  
  <p>I tried with an XML file with two strokes, but it doesn't work.</p>
  
  <p>I could do this with a 9png file, but I want to do it with pure coding.</p>