MainPresenter.kt

var job: Job? = null
 
fun startPresenting() {
    job = loadData()
}
 
fun stopPresenting() {
    job?.cancel()
}
 
private fun loadData() = launch(uiContext) {
    view.showLoading() // ui thread
 
    val task = async(bgContext) { dataProvider.loadData("Task") }
    val result = task.await() // non ui thread, suspend until finished
 
    view.showData(result) // ui thread
}