onKeyUp doesn't handle Enter from hard keyboard

Question

I have an activity with a set of buttons on it, it resembles a NumPad keyboard.

My purpose: to do some terminal for input data with help of little (hard) “usb NumPad keyboard” – so interface looks as NumPad – just a set of Buttons.

I want to handle all the keyboard events to do with them what I need to do (my own function for each button). Overrided functions onKeyUp and onKeyDown – and they do all that I need, except handling the Enter key. In these two functions it’s not an event at all as I see. On Enter activity opens menu, so Enter is some special function – not for me, but for system.

All the topics here that I saw (how to handle “Enter”) are about soft keyboard or EditView. I don’t have on my activity any editable, I just want to catch Enter event, or maybe possible link Enter with some of the Buttons on activity.

    override fun onKeyUp(keyCode: Int, event: KeyEvent): Boolean {
    Toast.makeText(this,keyCode.toString(),Toast.LENGTH_SHORT).show()

    val res: Int = when (keyCode) {
        KeyEvent.KEYCODE_NUMPAD_0 -> 0
        KeyEvent.KEYCODE_0 -> 0

        KeyEvent.KEYCODE_NUMPAD_1 -> 1
        KeyEvent.KEYCODE_1 -> 1
        KeyEvent.KEYCODE_DPAD_DOWN_LEFT -> 1

        KeyEvent.KEYCODE_NUMPAD_DOT -> 10

        KeyEvent.KEYCODE_NUM_LOCK -> 11

        KeyEvent.KEYCODE_NUMPAD_ENTER -> 16 //never happens

        else -> -1
    }
    if (res>=0) doAction(res)

    return if (res == -1) super.onKeyUp(keyCode, event)
    else true
}

Answer 1

Use dispatchKeyEvent to handle enter:

override fun dispatchKeyEvent(event:KeyEvent):Boolean {
   if (event.getAction() === KeyEvent.ACTION_UP)
   {
      Toast.makeText(this,event.getKeyCode().toString(),Toast.LENGTH_SHORT).show()
      return true
   }
}