title: Format text within a button
body: <p>I'm working on a custom numberpicker and I have a button with a '+' and '-' sign.<br>
  At the moment I just have this code to create the button.</p>
  
  <pre><code>increment = new Button(context);
  increment.setTextSize(25);
  increment.setText("+");
  </code></pre>
  
  <p>Now, i want to add the minimum and maximum value to be shown on the button like this.   </p>
  
  <p><img src="https://i.stack.imgur.com/iJbeX.png" alt="example of target look"><br>
  How can I achieve this?<br>
  So I need to center the max label, and give it a different size as the plus sign.</p>
  
  <p>Any help would be greatly appreciated! :)</p>