title: How do I create a custom Android keyboard with numbers-only?
body: <p>I need to create a custom keyboard containing numbers only.<br>
  But all the tutorials I found are about regular keyboards (qwerty).</p>
  
  <p>I need a layout like this, but I don't know where to even start with it.</p>
  
  <p><a href="https://i.stack.imgur.com/fbKbt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fbKbt.png" alt="enter image description here"></a></p>
  
  <p>Note, that just using the <code>numbers</code> or <code>phone</code> input method for my editTexts won't do.</p>