Android N brought the "cancel" feature directly on the download notification if you're using the DownloadManager.
Did they add any intent-filter action to catch this event ?
At this point DownloadManager gets only 3 actions :
The DownloadManager should send
ACTION_DOWNLOAD_COMPLETE broadcast to your app if user click on Cancel. But it is a known bug in Android N, Android team is working on it:
We have to wait for fix!