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

Marat Fayzullin has ported his (commercial) GameBoy Advance emulator VGBA to the Android platform: VGBA for Android

Quote:
What´s in this version:
* Enabled exporting VBA-formatted .SAV files via Advanced Settings menu.
* Added x4 scaling factor, for 1280x800 and larger screens.
* Added disclaimers when entering Cheatopedia or Cheat Editor.
* Removed "Quit" option from the VGBA Advanced Settings.
* Audio no longer skips and stutters when exiting emulation.
* Enabled ability to press several virtual buttons at once.
* Added Shining Soul, Shining Soul 2, Fire Emblem, Metroid Fusion, and Italian Pokemon Emerald entries to the Cheatopedia.