android studio onKeyUp real or documentation error - android-studio

Question

I am trying to use the documentation example provided in the reference
https://developer.android.com/training/keyboard-input/commands
for implementing the onKeyUp override function. In simplified form this is
override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean {
when (keyCode) {
KeyEvent.KEYCODE_SYSTEM_NAVIGATION_DOWN -> {
// do stuff here
return true
}
else -> super.onKeyUp(keyCode,event)
}
}// end override fun onKeyUp
the problem is that Android Studio doesn't recognize the super.onKeyUp function. Apparently I haven't established the input source correctly as the override isn't recognized either. I can get the result I want, sort of, by starting the class as follows
class KeyboardController(view: View, fragmentActivity: FragmentActivity) : InputController(),
View.OnKeyListener {// start class KeyboardController
then creating the override function
override fun onKey(v: View?, keyCode: Int, event: KeyEvent?): Boolean {
and then checking event.action and testing the key up and down keycodes individually but I seem to be missing something basic in order to use the example code above. Additionally the documentation at https://developer.android.com/guide/topics/ui/ui-events
indicates that View.OnKeyListener class supports the onKeyUp function but as indicated above android studio doesn't recognize the onKeyUp function so I cannot override it. What am I missing or is the documentation wrong?
I am using Android Studio Chipmunk (2021.2.1) with Kotlin.
Any feedback appreciated.