MainViewModel.kt

// PostRepository.kt
class PostRepository(private val typicodeService: TypicodeService) {

    fun getPosts(liveData: MutableLiveData<Result>, stateLiveData: MutableLiveData<UIState>) {

        stateLiveData.postValue(UIState.Loading)

        typicodeService.getPosts().enqueue(object : Callback<List<Post>> {

            override fun onResponse(call: Call<List<Post>>, response: Response<List<Post>>) {
                liveData.postValue(Result.Success(response.body()!!))
                stateLiveData.postValue(UIState.Complete)
            }

            override fun onFailure(call: Call<List<Post>>, t: Throwable) {
                liveData.postValue(Result.Failure())
                stateLiveData.postValue(UIState.Complete)
            }
        })
    }
}


 // MainViewModel.kt
class MainViewModel : ViewModel() {

    private val postRepository = PostRepository(RetrofitFactory.typicodeService)
    private val postLiveData = MutableLiveData<Result>()
    private val stateLiveData = MutableLiveData(UIState.Complete)

    val posts: LiveData<Result> = postLiveData
    val uiState: LiveData<UIState> = stateLiveData

    fun loadPosts() {
        postRepository.getPosts(postLiveData, stateLiveData)
    }
}