MainPresenter.kt

data class Result<out T>(val success: T? = null, val error: Throwable? = null)
 
private fun loadData() = launch(uiContext) {
    view.showLoading() // ui thread
 
    val task = async(bgContext) { dataProvider.loadData("Task") }
    val result: Result<String> = task.await() // non ui thread, suspend until the task is finished
 
    if (result.success != null) {
        view.showData(result.success) // ui thread
    } else if (result.error != null) {
        result.error.printStackTrace()
    }
}