title: Android : start activity from background service
body: <p>I have a background service running all the time after bootup.
  Based on some condition I have to start activity from service and get the response from activity. After getting the response I have to do some processing in service.</p>
  
  <p>I google searched and found that I should use notifications. But its not clear how to send the response back from activity to service.</p>
  
  <p>Can anyone please help me out.</p>
  
  <p>Thnaks.</p>