Capture volume key events in Android TV Box from Android version 8.1 on wards

[MSPL Dev]

We have Android TV (ATV) box running on Android version 8.1 and above. We need to get key events for volume keys when pressed from ATV remote. Unfortunately we couldn't get volume key events from Android version 8.1. But we can get volume key events from Android version Nougat 7.0 box.

Question : How I need to capture volume key events in Android TV box versions 8.1 and 9 [pie] ?

We have tried following callback API : onKeyDown(), onKeyUp(), dispatchKeyEvent(), onKeyLongPress() and onKeyEvent() in activity class.

Code :
override
public boolean onKeyDown(int keyCode, KeyEvent event){
Log.d(TAG,"Key code pressed:" + event.getKeycode);
}

Actual output : onkeydown not get triggered for volume keys

Expected output : Key code pressed :25 Key code pressed: 24

Image : Remote used for capturing key events