MainActivity.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        //Notice that I didn't need to call findViewById(), thanks to Synthetic Binding!
        btndownload.setOnClickListener { downloadData() }
    }

    fun downloadData() {
        doAsync {
            //Execute all the lon running tasks here
            val s: String = makeNetworkCall()
            uiThread {
                //Update the UI thread here
                alert("Downloaded data is $s", "Hi I'm an alert") {
                    yesButton { toast("Yay !") }
                    noButton { toast(":( !") }
                }.show()
            }
        }
    }
}