This app was mentioned in 2 comments, with an average of 2.00 upvotes
You can both register accounts on DGS ( www.dragongoserver.net/)
Then use this app ( https://play.google.com/store/apps/details?id=com.timk.ogsclient) to play. It's made for correspondence go so you can resume whenever.
For Dragon Go, I use: https://play.google.com/store/apps/details?id=com.timk.ogsclient&hl=en
It has notifications and pretty decent features overall.