Как сделать секундомер с handler на kotlin?

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class Stopwatch {
    private var startTime: Long = 0
    private var elapsedTime: Long = 0
    private var isRunning: Boolean = false

    private val handler = Handler()
    private val tick = object : Runnable {
        override fun run() {
            val now = System.currentTimeMillis()
            elapsedTime += now - startTime
            startTime = now
            val minutes = (elapsedTime / 1000) / 60
            val seconds = (elapsedTime / 1000) % 60
            val milliseconds = elapsedTime % 1000
            val time = String.format("%02d:%02d:%03d", minutes, seconds, milliseconds)
            onTickListener?.onTick(time)
            handler.postDelayed(this, INTERVAL)
        }
    }

    private var onTickListener: OnTickListener? = null

    fun start() {
        if (!isRunning) {
            startTime = System.currentTimeMillis()
            handler.post(tick)
            isRunning = true
        }
    }

    fun stop() {
        if (isRunning) {
            handler.removeCallbacks(tick)
            isRunning = false
        }
    }

    fun reset() {
        elapsedTime = 0
        onTickListener?.onTick("00:00:000")
    }

    fun setOnTickListener(listener: OnTickListener) {
        onTickListener = listener
    }

    interface OnTickListener {
        fun onTick(time: String)
    }

    companion object {
        private const val INTERVAL = 10L // update interval in milliseconds
    }
}

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val stopwatch = Stopwatch()
stopwatch.setOnTickListener(object : Stopwatch.OnTickListener {
    override fun onTick(time: String) {
        // обновлять UI с текущим временем
    }
})

stopwatch.start() // запуск секундомера