title: non removable notification
body: <p>In my app, there is service running on background. I want to notify user that the service is running. But I need that user cannot delete the notification - by pressing clear button or by swipe it out, in notification bar</p>
  
  <p><img src="https://i.stack.imgur.com/1vAWt.jpg" alt="enter image description here"></p>
  
  <p>It means I need to show my notification above Notification area</p>