ProjectProto: Android-Arduino Communication via USB OTG
USB Communication between Android and Arduino - The Engineering Projects
Serial Tutorial - Tutorials - Particle
USB Serial Communication Using Android Devices - MATLAB & Simulink - MathWorks 日本
Android Arduino Comms - USB Host | B4X Programming Forum
CQRobot RS485 or RS422 to USB Serial Communication Port Converter Adapter Cable. with FTDI FT232 Chipset, 300-921600bps Rate, 2.2 Meters, for Win7 / Win8 / Win10, ME, Linux, MAC, SCM, Android, etc. :