How to exchange data between Arduino board and Anrdoid phone via OTG USB as through COM port?

Question

Android

Hello!
It is necessary to carry out two-way data transfer from the Anrdoid phone and Arduino with a scarf. I found an Arduino ADK board that can do this. But I don't want to buy another board. Maybe using some libraries on the phone side, you can simulate COM to USB, so that by connecting Phone <--> OTG cable <--> Arduino board they can communicate as if 2 devices are connected via COM?
Thanks to all!

Answer 1

Android 4.x (API 15+) has functions for working directly with USB - a Java application acts as a driver - the market is full of such programs, there are even open source ones.
www.java2s.com/Open-Source/Android_Free_Code/Devel...

Answer 2

if OTG works (not a fact), if the android has all the necessary drivers and kernel modules (not a fact), then you can read and write to the COM port without any problems, it is visible there as a regular file, reading and writing, respectively, as in a file