title: Communicating with serial USB device over Android
body: <p>I have one custom made device for measuring current. This device can be connected to PC and communication is done over USB. It is based on FTDI chip. I have application written in Java and that application is using rxtxSerial.dll library and gnu.io.rxtx_2.1.7.4.jar. Now I want to port this application on my android device and I'm litte bit confused what to do that? All I have is android tablet (os version 4.1.1), OTG cable and this measuring device.</p>
  
  <p>Should my device be rooted? Is there any kind of library that I can simply add to my Java Android application and read data over USB? Where to start?</p>
  
  <p>I have tried to port existing application for PC using same library, but rxtxSerial.dll is missing and I can't transfer it to my android device. </p>