val handler = Handler(Looper.getMainLooper())
val runnable = object : Runnable {
    override fun run() {
        if (countProgress.progress > 0) {
            val new_time = countProgress.progress.toInt() - 1
            timeLabel.text = "$new_time segundos"
            countProgress.progress = new_time
        }

        handler.postDelayed(this, 1000)
    }
}

playCount.setOnClickListener() {
    handler.postDelayed(runnable, 1000)
}
pauseCount.setOnClickListener() {
    handler.removeCallbacks(runnable)
}