꿈 많은 개발자가 되자! Tae-hwan

fun setup() {
    val job = GlobalScope.launch(Dispatchers.Main) { // launch coroutine in the main thread
        for (i in 10 downTo 1) { // countdown from 10 to 1
            tv_message.text = "Countdown $i ..." // update text
            delay(500) // wait half a second
        }
        tv_message.text = "Done!"
    }
    fab.setOnClickListener {
        job.cancel() // cancel coroutine on click
    }
}