SMART EVB G2 : SC 200E, Android Firmware Doubt

Hey,
Thanks, it greatly helped to remove status bar, navigation bar. Moving forward I wanted to ask about access to UART and GPIOs through this type of app. I tried to use UsbManager(for UART access) which seems to not be made for this and I am not too sure which direction to go from here. Something along these lines: How to test the Main UART port of SC20 Module