Hey, look! It’s the Android 4.2 keyboard pulled from a Nexus 4 dump! It’s probably an early build, hence the ugly white and blue floating word prediction, which is unlike the subtle floating word prediction that Hugo Barra showed off yesterday. No matter what though, it’s neat to use and it works well. It predicts on the fly, corrects as needed, and flows like butter.
For Non-stock Android devices:
1. If you have a non-stock Android device, like a Galaxy S3 or RAZR HD, just install it.
2. Download the app from above, and install it like you would any other 3rd party app.
3. Then head into Keyboard settings and activate the keyboard.
4. Then open a text box and change to this new keyboard.
For Stock Android devices:
1. You will have to flash a .zip file to overwrite your current stock keyboard.
2. You can download it here.
3. Yes, you need to be rooted.
4. Yes, you should backup your old keyboard, just in case.
5. If you are running a ROM, feel free to try and install it.
Via: Android Police