LiveDataSampleViewModel_3

class MainViewModel : ViewModel() {
...
    fun onClick() {
        val handler = Handler()
        handler.postDelayed(runnable, 1500)

        val asyncTask = BackGroundTask(eventData)
        asyncTask.execute()
    }
}

class BackGroundTask(private val eventData: MutableLiveData<String>) : AsyncTask<String, String, Int>() {
    override fun doInBackground(vararg p0: String?): Int {
        Thread.sleep(500)
        eventData.postValue("AsyncTask")

        return 0
    }
}