title: Notifications Cancel Button in android
body: <p><img src="https://i.stack.imgur.com/ml32d.png" alt="There is a croos button in notification, how to add that??"></p>
  
  <p>the screenshot contains notifications from two different applications.
  in the upper notification , there is a cancel button, How to add that  button in notification.
  Any help will be extremely thankful.</p>