via http://emu-russia.net/en/

Nintendo GameBoy/GameBoy Color emulator for Android has been updated. Changes:
- Added floating action button that starts the last played game.
- Added "Show Action Button" option to the Settings.
- Optimized controls for Nvidia SHIELD Portable and similar devices.
- FIRE-R, FIRE-Y, and SELECT buttons open File Selector main menu.
- FIRE-X button opens File Selector navigation menu.
- FIRE-L button opens Gallery from the File Selector.
- FIRE-B button now exits File Selector.
News source: https://play.google.com