via http://www.aep-emu.de/
Marat Fayzullin has ported his (commercial) GameBoy Advance emulator VGBA to the Android platform: VGBA for Android
Quote:
New in 3.6.12:
- Enabled sampled sound channels.
- Added configurable custom key mappings.
- Added optional haptic feedback.
- Restored MENU button on Android Honeycomb.
- Finger joystick now shows up on tablets in portrait orientation.
- Optimized joystick drawing routines.