I recently heard from another user who had a similar problem with his Tango 2 radio on android. I thought I'd share his workaround here in case someone else has the same issue.
(Note that this worked for him using the Tango 2 - it might not work with the Literadio 2, but it might be worth a try).
"I downloaded an app called Gamepad Tester
https://play.google.com/store/apps/details?id=ru.elron.gamepadtester&hl=en_IN&gl...
So I connect the TBS Tango 2, put it on joystick mode. Go in this app and it will detect movement when I move the joystick. Then I open the Freerider app and voila go to calibration and it detects it.
The only issue is ( which really isn't an issue for me ), that I have to mostly do the calibration every time. Sometimes disconnect and reconnect Tango 2-3 times until the GamepadTester App detects it. "