FPse for Android is the fastest and most compatible PSone emulator for handheld devices.(also known as PSX or Playstation 1)
More than 150.000 active users and rated up to 4,5 stars on google play!
FPse support OpenGL which gives outstanding graphics!
Take a look to the Official Documentation to understand requirements and how it works:
Create an ISO image from your favorite games and enjoy playing them on your Android phone.
FPse features the following:
-High sound quality
-Real-time save states
-Audio track emulation (using .cue files)
-Dynamically loadable Overlay Pads
-Analog Stick emulation
-Compatible with G-Sensor, Touchscreen and Hardware keys
-Supports .img, .iso, .bin, .cue, .nrg , .mdf and .Z disc image formats
-Full Support for IcontrolPAD, BGP100,Zeemote (via Bluez IME)
-OpenGL support via external plugin! Install and play with modded Google play by ChelpuS or
Remove license verification with Lucky patcher via 'Custom patch' by SanX