How to send email through Gmail using OAuth in Java/Android?

Question

I have successfully sent emails in my application using OAuth 1.0a (using Signpost) by constructing an XOAUTH string as described here. The problem is that access tokens expire after an hour and this XOAUTH won't authenticate the user for SMTP server after that.

Is there a way to extend/refresh the access token's lifetime without user's intervention? I know this Android app does that, but how?

I managed to upgrade to OAuth 2.0 (using Scribe) where I'm given a refresh token as well, but it looks like Gmail XOAUTH doesn't support OAuth 2.0 tokens. Does Google provide another way to send emails?

UPDATE: GMail now supports XOAUTH with IMAP and SMTP on OAuth 2.0. — n0rmzzz
– n0rmzzz, Commented Feb 10, 2014 at 11:26

n0rmzzz · Accepted Answer · 2012-08-10 01:28:24Z

1

I just managed to fix it. The OAuth 1.0 access token is actually long-lived, but the XOAUTH string is valid for a short period of time, hence needs to be created/signed frequently.

answered Aug 10, 2012 at 1:28

n0rmzzz

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n0rmzzz Over a year ago

This is my code: beansgocrazy.blogspot.com.au/2012/08/…

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