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PS2 Emulators for Android: All the best options available
There are only a few great PS2 emulators on Android at the moment.
NetherSX2 features settings that can be adjusted on a per-game level, touchscreen and Bluetooth controller support, save states, widescreen patches and upscaling, and a lot more. There's no official way to install Aether or Nether, but there are plenty of great guides online that will help you get your favorite PS2 games running on your Android device in no time. There seems to be no "funny business" taking place, and since both are open source, this makes it easier for bugs to get squashed and the development process to continue to progress.
Or read this on Android Central