I have just published VGB-Android 3.7.12, a new version of my GameBoy Classic and GameBoy Color emulator for Android, which will also do Super GameBoy emulation:

https://play.google.com/store/apps/details?id=com.fms.vgb

The new version fixes timings on a few common Z80 instructions, which should hopefully stop random slowdowns during emulation. Also, if you are using a Bluetooth joystick or keyboard, the new VGB will automatically hide the on-screen controls. Touch the screen to make them reappear, or you can disable this feature completely in the Settings. Finally, I have introduced some assembler optimizations to the "Soften Video" mode, previously added to my other emulators.

Fixed "JR offset" and "JR Z,offset" instruction timings.

Added option to hide virtual gamepad when using the real one (enabled by default).

Optimized "Soften Video" algorithm in assembler and gained +15fps.

Added Android menu and action items to the Gallery.