title: Uri to default sound notification?
body: <p>I use the <a href="http://developer.android.com/reference/android/app/Notification.Builder.html" rel="noreferrer">Notification.Builder</a> to build a notification.
  Now I want to use the default sound notification with:</p>
  
  <pre><code>builder.setSound(Uri sound)
  </code></pre>
  
  <p>But where is the Uri to the default notification?</p>