title: Listen outgoing SMS or sent box in Android
body: <p>I am developing an application which will store all the incoming and outgoing sms in a text file in SD card. </p>
  
  <p>I am able to listen incoming messages using broadcast receiver. I am finding it very difficult to listen to outgoing SMS. </p>
  
  <p>I know to some extent that a content observer on the sent box or outbox needs to be set, but I don't know how to do it. </p>
  
  <p>How can this be done?</p>