This app was mentioned in 3 comments, with an average of 1.00 upvote
https://play.google.com/store/apps/details?id=com.johnemulators.johngba
John GBA. Dont know if its still available though, have had it for years.
Edit: link: https://play.google.com/store/apps/details?id=com.johnemulators.johngba