title: Updating data and issuing notifications from outside of an Activity
body: <p>I'd like to solve the following problem:</p>
  
  <p>An application displays something via a <code>WebView</code>, but to alert the user when the content has been changed, a notification should be issued that leads the user to the <code>Activity</code>.</p>
  
  <p>The question is: how do I constantly check for updates even though the user probably hasn't even started the application another time? Is that even possible, since I don't think you can have a service starting when the phone boots or something comparable - if any of you have an idea, I'd be grateful to hear it.</p>
  
  <p>Cheers!</p>