use a pysical gamepad to operate android application

Question

I need to use a gamepad (physical joystick and button) to opeate my android application. I check the related offical documentation:enter link description here. and my code: but no toast when I connect and operate the gamepad. Do I need other related libraries? I didn't make any set-up action, nor did we set the manifest. I found that most joystick related examples are virtual joystick on the phone, but in my case, I am connecting a physical gamepad to my android application.

 private View.OnKeyListener mCorkyListener = new View.OnKeyListener() {
    public boolean onKey(View v, int i, KeyEvent event) {
        // do something when the button is clicked
        Toast.makeText(getApplicationContext(), event.getKeyCode() ,Toast.LENGTH_SHORT).show();
        switch (event.getAction()){
            case KeyEvent.ACTION_UP:
                break;
            case KeyEvent.ACTION_DOWN:
                break;
        }
        return true;
    }
};