This app was mentioned in 1 comment, with an average of 1.00 upvote
Just need to pick a better keyboard.
There's probably better ones, give me a second to look.
EDIT: Swiftkey has a one handed mode. It's called "compact."
Swiftkey is definitely worth using, it's so much better than the normal keyboard.
Market link: https://play.google.com/store/apps/details?id=com.touchtype.swiftkey&hl=en