MovieListViewModel.kt

class MovieListViewModel(private val repository: MovieRepository) : BaseViewModel() {

    private val mMovies = StateMutableLiveData<List<Movie>, Throwable>()
    val movies : StateLiveData<List<Movie>, Throwable> get() = mMovies

    fun findMovies() {
        jobs add launch {
            mMovies.loading.value = true
            try {
                val response = repository.findMovies().await().results
                mMovies.success.value = response.sortedByDescending { it.releaseDate }
            } catch (t: Throwable) {
                mMovies.error.value = t
            }
            finally {
                mMovies.loading.value = false
            }
        }
    }
}

MoviesActivity.kt

        viewModel.movies.observe(this,
            onSuccess = { list: List<Movie> ->
                rvMovies.adapter = MoviesAdapter(list) {
                    flowController.openMovieDetail(it)
                }
            },
            onLoading = { isLoading: Boolean ->
               progress.show(isLoading)     
            },
            onError = { throwable: Throwable ->
                toast(throwable.message.toString())
            }
        )