// Event/Data wrapper

sealed class Event<out T> {
    class Loading<out T> : Event<T>()
    data class Success<out T>(val data: T) : Event<T>()
    data class Failure<out T>(val throwable: Throwable) : Event<T>()
}

// ViewModel

class HomeViewModel : ViewModel() {
    val text: LiveData<Event<String>> = liveData {
        emit(Event.Loading())
        try {
            emit(Event.Success("This is home fragment"))
        } catch(exception: Exception) {
            emit(Event.Failure(exception))
        }
    }
}

// Fragment

class HomeFragment : Fragment() {

    private lateinit var homeViewModel: HomeViewModel

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        homeViewModel = ViewModelProvider(this).get(HomeViewModel::class.java)
        val root = inflater.inflate(R.layout.fragment_home, container, false)
        val textView: TextView = root.findViewById(R.id.text_home)

        homeViewModel.text.observe(viewLifecycleOwner, Observer {
            when (it) {
                is Event.Loading -> { /*show progress*/ }
                is Event.Success -> textView.text = it.data
                is Event.Failure -> { /*show progress, show error*/ }
            }
        })

        return root
    }
}