title: How to know when user has deleted a notification
body: <p>I'm developing an app that download something data from server and make notifications every time when this data is downloaded successfully. But also i need to send a statistic when user has opened a notify or has deleted it. It simple to send if user has opened a notify - just add a boolean key in intent, and in activity just execute "send" code by this key. But what about the another user action - delete the notify. Here goes my problem -  i can't create any intent cause no activity will be created by this action, how i can know when user has deleted a notification?</p>