FPse for android $3.63

FPse for Android is the fastest and most compatible PSone emulator for handheld devices.(also known as PSX or Playstation 1)
More than 200.000 active users and rated up to 4,5 stars on google play!
FPse is able to render PSone games in high resolution by using OpenGL which gives outstanding graphics!

Take a look to the Official Documentation to understand requirements and how it works:

http://www.fpsece.net/faq.html

Create an ISO image from your favorite games and enjoy playing them on your Android phone.

FPse features the following:
-Impressive UI which scan and draw covers games automatically!
-High performance
-High compatibility
-High sound quality
-Real-time save states
-Audio track emulation (using .cue files)
-Force-feedback
-Dynamically loadable Overlay Pads
-Guncon emulation
-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)
- Full native support for Xbox 360 pads, PS3 Sixasis pads and MOGA controllers!!
-OpenGL support via external plugin!
-Experimental LAN multi Players mode using two Android devices! Play with two players mode with games that wasn't made for that! IE: Tekken3!
-Exclusive automatic cheats search engine.

And much more impressive features!

From the new UI you can load and share covers and even compress games...
Please visit Forum if you have any question.

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