title: How to display timer in activity?
body: <p>I need to display a time duration on a few of my Activities within the application. The timer starts when one of the Activity starts.   </p>
  
  <ul>
  <li>Should I use service for the timer ?</li>
  <li>Is this the best way ?  </li>
  <li>Or should I start thread from one of the Activity ?</li>
  </ul>