Google documents four solutions here for accessing a serial port within Android.  Another TDG forum user also suggested the android-serialport-api as a solution in another TDG forum post found here..

I tried the android-serialport-api and it works fine.

For everyone's information:

/dev/ttyO2 is UARTB on the development board

/dev/ttyO1 is the bluetooth port. I think if you are not using this port, you can probably re-purpose it as a generic UART

/dev/ttyO0 might be UARTC on the dev board, but I can't seem to get it to work.

The other UARTs are not accessible if you use the current android 2.3.4 image.

Hopefully this is extraneous information for most, but one must chmod the /dev/tty ports before using them. Otherwise, the android-serial-api does not have permission to use them.