如何重寫Android 功能鍵？

override fun onKeyLongPress(
    keyCode: Int, 
    event: KeyEvent?
): Boolean {
    println("onKeyLongPress " +
            "keyCode = $keyCode, " +
            "event = ${event?.action}"
    )
    return super.onKeyLongPress(keyCode, event)
}

override fun onKeyUp(
    keyCode: Int, 
    event: KeyEvent?
): Boolean {
    println("onKeyUp " +
            "keyCode = $keyCode, " +
            "event = ${event?.action}"
    )
    return super.onKeyUp(keyCode, event)
}

override fun onKeyDown(
    keyCode: Int, 
    event: KeyEvent?
): Boolean {
    println("onKeyDown " +
            "keyCode = $keyCode, " +
            "event = ${event?.action}"
    )
    when(keyCode) {
        KeyEvent.KEYCODE_BACK -> {
        }
        else -> {
            //依照super方式處理
            return super.onKeyDown(keyCode, event)
        }
    }
    //true = 攔截事件
    //false = 未處理
    //onKeyDown如果未依照super方式處理
    //將無法監聽到onKeyLongPress
    return true
}

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