title: How to remove all notifications when an android app (activity or service) is killed?
body: <p>I have an app with an activity and an intent service running in the background.</p>
  <p>There's also a notification which shows a progress bar with the progress of the background process (it's downloading a lot of files from a server).</p>
  <p>The activity shows the download progress ( user can't meaningfully use the app before these assets are downloaded). When this activity is closed, the notification with the progress bar is shown.</p>
  <p>My issue: When the application is killed via the &quot;task manager&quot; (accessible via right button on android 4.0, the one with the two rectangles), the notification is still there. But it's basically a zombie, because the service that used to update it is dead.</p>
  <p>Put in a different way: How can I remove a (or all) notification(s) when my application is killed?</p>