Here is talo@ suggested solution:

1. User starts to download a page or a file but doesn't have space
2. Download is paused (notification is in paused state)
3. Notification now reads:
Helper text: "Not enough space on device."
Actions: "Free up space", "Cancel"
4. Tapping "Free up space" takes users to android storage settings
5. Once there is enough space on the device, download automatically resumes

If the change in actions, is difficult, we could also just change the helper text and keep the current actions.

Issue 667817 has been merged into this issue.

- We can detect the free space on disk where we're saving the file (ApiCompatibilityUtils has the helper methods for this and it's how we drive the UI).  I think using a native call to stat would probably return the same data.

- As for loading the storage settings, we can try kicking off an intent with ACTION_INTERNAL_STORAGE_SETTINGS and seeing if that works.  Not sure though.