A couple of comments above.
In terms of starting an activity, I think it is maybe a bit too much, but let's do that for now.
In the long term, I think having a dialog would be better maybe?

Yes, a dialog would be better. I wasn't certain how to go about doing it since the activity is used elsewhere (when you first sync, signup). Would we replace all of it with the same dialog?

Probably it would make sense to use the same dialog everywhere.
Right now when you try to sync, you are prompted with the activity and you need to press back and sync again, while, if it were a dialog, we could just continue after the user is signed in.

Let's do that at a later time.

Let's do this for now and iterate on the strings and the hkey/username issue.

Sure. They're small changes. I was just about to get to them. Mind if I send another pull request in a bit?

Please do sent pull requests at any time!
Thanks for all the help and contributions to the project.