KotlinCoroutineLiveData

kotlin Coroutin using retrofit and Live Data with MVVM Architecture

Add below dependencies in app level build.gradle file

For kotlin coroutine:

                  implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1'
                  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1"
                  implementation 'com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:0.9.2'

For Live data using android lifrecycle:

                   implementation "android.arch.lifecycle:extensions:1.1.1"
                   annotationProcessor "android.arch.lifecycle:compiler:1.1.1"
                   kapt "com.android.databinding:compiler:3.1.4"
                   implementation "android.arch.lifecycle:runtime:1.1.1"

For retrofit:

                   implementation 'com.squareup.retrofit2:retrofit:2.4.0'
                   implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
                   implementation 'com.squareup.okhttp3:logging-interceptor:3.10.0'

For coroutin use "Deferred" keyword to call API using retrofit in Api interface class like below:

                   @GET("CountryApi/image.json")
                       fun getImageList(): Deferred<List<ApiResponseModel>>

Use CoroutineCallAdapterFactory() in retrofit object like below:

                   val retrofit: Retrofit = Retrofit.Builder()
                              .baseUrl(BASEURL)
                              .client(client)
                              .addConverterFactory(GsonConverterFactory.create())
                              .addCallAdapterFactory(CoroutineCallAdapterFactory())
                              .build()

Call API as per below:

                   fun getImageList(): LiveData<List<ApiResponseModel>> {

                          val data = MutableLiveData<List<ApiResponseModel>>()
                          GlobalScope.launch(Dispatchers.Main) {
                              val result = apiInterface?.getImageList()
                              try {
                                  data.value = result!!.await()
                              } catch (e: HttpException) {
                                  data.value = null
                                  e.printStackTrace()
                              } catch (e: Throwable) {
                                  data.value = null
                                  e.printStackTrace()
                              }
                          }
                          return data
                      }