Advanced open-source NES/Famicom emulator based on FCEUX 2.2.3-svn, designed and tested on the original Droid/Milestone, Xoom, Galaxy S2, Nexus 4, Nexus 7, NVidia Shield, and Xperia Play, but works on virtually any device with similar or better specs.

Features include:

• Backup memory and save state support, state files from FCEUX should work on NES.emu and vice-versa.
• Supports ROM-based games in .nes and .unf formats, optionally in zip files
• Famicom Disk System emulation using .fds files (select your BIOS in the options first)
• VS UniSystem support, push Start to insert coins
• Uses FCEU-compatible cheat files (.cht extension) with editing features
• Zapper/Gun support, touch screen to fire, touch & hold outside of display area to simulate firing away from the TV
• Configurable on-screen multi-touch controls
• HID Bluetooth/USB gamepad & keyboard support compatible with any input device recognized by the OS (MOGA Pro, etc.), Wii controllers also supported if running Android 4.1 or lower, all devices support custom key profiles
• Works in any orientation

What's New:

• Added Prescale 2x effect, gives sharp edges at any zoom level without turning off linear filter
• Improved shader effect compatibility with some older GPUs
• Fixed some text input issues

More info:

https://play.google.com/store/apps/details?id=com.explusalpha.NesEmu