Control Arduino via USB OTG from Android | Brookepedia
Serial USB Terminal - Apps on Google Play
Amazon.com: USB TTL uart Cable USB Console Serial Cables for Galileo Boards ttl-ft232r-5v 6pin 2.54mm ftdi chipset Support win8 10 Android mac etc : Electronics
FT232 USB UART Board (Type A) USB TO UART solution with USB Type A connector
Connect Android to Arduino via USB on the go
Amazon.com: Suamdoen USB to TTL Serial 5V 3.3V Adapter Cable TX RX VCC GND Pinout with 4 Pin 0.1 inch Pitch Female Socket FTDI Chip for Windows 10 8 7 XP Vista
Amazon.com: USB to TTL UART Serial 5V 3.3V Adapter Converter Cable 6 Pin 0.1 inch Pitch Female Socket TTL-232r-RPI Debug Terminal Cable With FTDI Chip for Windows 10 8 7 XP Vista
USB Communication between Android and Arduino - The Engineering Projects
Android Things - Discovering the UART API
Delock Products 62533 Delock Adapter Micro USB > Serial RS-232 for Android devices
Android+Arduino serial(USB) communication. Source code+APP. Robot car project#11 - YouTube