Android LiveData sur Kotlin utilisant Retrofit et coroutines

 import android.arch.lifecycle.MutableLiveData import android.util.Log import com.jakewharton.retrofit2.adapter.kotlin.coroutines.experimental.CoroutineCallAdapterFactory import kotlinx.coroutines.experimental.android.UI import kotlinx.coroutines.experimental.async import retrofit2.Retrofit import retrofit2.converter.gson.GsonConverterFactory import okhttp3.OkHttpClient import okhttp3.logging.HttpLoggingInterceptor import retrofit2.Call import retrofit2.http.* import ru.gildor.coroutines.retrofit.Result import ru.gildor.coroutines.retrofit.awaitResult object ServerAPI { var API_BASE_URL: String = getNetworkHost(); var httpClient = OkHttpClient.Builder().addInterceptor( HttpLoggingInterceptor().apply { level = if (BuildConfig.DEBUG) HttpLoggingInterceptor.Level.BODY else HttpLoggingInterceptor.Level.NONE }) var builder: Retrofit.Builder = Retrofit.Builder() .baseUrl(API_BASE_URL) .addCallAdapterFactory(CoroutineCallAdapterFactory()) .addConverterFactory(GsonConverterFactory.create()) var retrofit = builder .client(httpClient.build()) .build() var netService = retrofit.create<NetService>( NetService::class.java!!) interface NetService { @GET("api/stores") fun getStoreAll(@Header("Authorization") bearer: String): Call<Array<Store>> } } 

  class Repository { fun getStores(token: String) : MutableLiveData<Resource<Array<Store>>>{ val mutableLiveData = MutableLiveData<Resource<Array<Store>>>() mutableLiveData.value = Resource.loading(null) val req = PostsAPI.netService.getStoreAll(token) try { async(UI) { val result = req.awaitResult() // Check result type when (result) { //Successful HTTP result is Result.Ok -> { mutableLiveData.value = Resource.success(result.value) } // Any HTTP error is Result.Error -> { mutableLiveData.value = Resource.error("Http Error!", null) } // Exception while request invocation is Result.Exception -> Log.d(TAG, result.exception.message) } } } catch (e: Exception) { Log.d(TAG, e.toString()) } return mutableLiveData } } 

 // A generic class that contains data and status about loading this data. public class Resource<T> { @NonNull public final Status status; @Nullable public final T data; @Nullable public final String message; private Resource(@NonNull Status status, @Nullable T data, @Nullable String message) { this.status = status; this.data = data; this.message = message; } public static <T> Resource<T> success(@NonNull T data) { return new Resource<>(Status.SUCCESS, data, null); } public static <T> Resource<T> error(String msg, @Nullable T data) { return new Resource<>(Status.ERROR, data, msg); } public static <T> Resource<T> loading(@Nullable T data) { return new Resource<>(Status.LOADING, data, null); } public enum Status { SUCCESS, ERROR, LOADING } } 

 class StoresViewModel (context: Context, token: String) : ViewModel() { val stores: MutableLiveData<Resource<Array<Store>>> init { val api = Repository() stores = api.getStores(token) } } 

 class AppViewModelFactory(private val contect: Context, vararg params: Any) : ViewModelProvider.NewInstanceFactory() { private val mParams: Array<out Any> init { mParams = params } override fun <T : ViewModel> create(modelClass: Class<T>): T { return if (modelClass == LoginViewModel::class.java) { LoginViewModel(contect, mParams[0] as String, mParams[1] as String) as T } else if (modelClass == StoresViewModel::class.java) { StoresViewModel(contect, mParams[0] as String) as T } else { super.create(modelClass) } } } 

  override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { val view = inflater.inflate(R.layout.stores_fragment, container, false) val tokenHolder = TokenHolder(PreferenceManager.getDefaultSharedPreferences(requireActivity())) viewModel = ViewModelProviders.of(this, AppViewModelFactory(requireActivity(), tokenHolder.token)).get(StoresViewModel::class.java) recyclerView = view.findViewById<RecyclerView>(R.id.store_list).apply { setHasFixedSize(true) } return view } override fun onActivityCreated(savedInstanceState: Bundle?) { super.onActivityCreated(savedInstanceState) // Observe data on the ViewModel, exposed as a LiveData viewModel.stores.observe(this, Observer<Resource<Array<Store>>> { storesResource -> val stores = storesResource?.data stores?.let { viewAdapter = StoresAdapter(stores!!) recyclerView.adapter = viewAdapter } if (storesResource?.status == Resource.LOADING){ log("Loading...") } if (storesResource?.status == Resource.ERROR){ log("Error : " + storesResource?.message) } }) }