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 3.8.25:
* Added virtual joystick layout editor (see "Edit Layout" in Settings).
* Improved sound quality.

VGBA-Android 3.8.22
* Enabled "Move to SD Card" feature. VGBA can now be installed to SD
card.
* Added Harvest Moon cheats to Cheatopedia.
* Added Final Fantasy Tactics cheats to Cheatopedia.
* Added "infinite money" cheat to the Pokemon Emerald Cheatopedia