title: Why is Android ContentObserver's onChange() not getting called?
body: <p>I am trying to create a ContentObserver that will inform me when an SMS is sent from my device.  When I use the following my onChange() gets called:</p>
  
  <pre><code>public static final Uri uriSMS = Uri.parse("content://sms");
  </code></pre>
  
  <p>However, when I try to limit it to just sent SMS messages using this:</p>
  
  <pre><code>public static final Uri uriSMS = Uri.parse("content://sms/sent");
  </code></pre>
  
  <p>it does not work; the onChange() method simply doesn't get called.  Can anyone help me troubleshoot this?</p>