title: android:digits not working with _ and ,
body: <p>I want to allow only letters, numbers, <code></code> and _ in a edittext.</p>
  
  <p>So I added:</p>
  
  <pre><code>android:digits="0123456789,qwertzuiopasdfghjklyxcvbnm,_, "
  </code></pre>
  
  <p>the problem is it allows sometimes <code>,</code>.</p>
  
  <p>And only allow <code>_</code> if I type it in my real keyboard, but not in android keyboard.</p>
  
  <p>Any ideas what I did wrong?</p>