[K] coroutine > Kotlin

coroutine 

fun getNetwork() {
    CoroutineScope(Dispatchers.Main).launch {
        // Show progress from UI thread
        var data = ""
        CoroutineScope(Dispatchers.Default).async {
            // background thread
            data = loadNetworkSomething()
        }.await()
        text_home.text = data
        // UI data update from UI thread
        // Hide Progress from UI thread
    }
}

fun loadNetworkSomething():String{
    return "20"
}

//launch-리턴값 없음
    fun setup() {
        val job = GlobalScope.launch(Dispatchers.Main) { // launch coroutine in the main thread
            delay(2000)
            val mProgressDialog =indeterminateProgressDialog(message = "Please wait a bit…", title = "Fetching data")
            mProgressDialog.show()
            for (i in 10 downTo 1) { // countdown from 10 to 1
                text_home.text = "Countdown $i ..." // update text
                delay(1000) // wait half a second
            }
            mProgressDialog.dismiss()
            text_home.text = "Done!"
            btn_home.visibility=View.INVISIBLE
        }
        btn_home.setOnClickListener {
            job.cancel() // cancel coroutine on click
        }
    }