via http://www.aep-emu.de/

NeoDroid is a SNK Neo-Geo emulator for Android and is based on GnGeo.

Quote:
- Download and install neodroid apk AND gngeolibs apk
- Put bios archive (neogeo.zip) inside your roms directory
- Put roms anywhere but in the same directory as your bios file (neogeo.zip)
- Compatible with mame roms format
- Run at full speed on 1GHZ+ devices
- Compatibility should be the same as the GnGeo version 0.8 emulator