title: Silly question about android activty lifecycle
body: <p>I have activity+service classes.</p>
  
  <p>When program runs activity will be shown and service will be started in <code>onCreate</code>  method of activity.</p>
  
  <p>When I clicked on HOME button of virtual machine, HOME SCREEN will be appear but activity will have been gone</p>
  
  <ol>
  <li>at this point, I wonder that program in which situation -paused/stopped- ???</li>
  <li>what happened to the service? (is it still running?)</li>
  <li>how can I bring the activity to front using the service?</li>
  </ol>
  
  <p>Thank you...</p>