安卓：MVP + 刀柄 + 改造

Question

I'm trying add Hilt in Android with MVP and Retrofit, but I don't know how inject Api Service from Retrofit into Presenter. The Android Studio show me this error:

error: [Dagger/DependencyCycle] Found a dependency cycle: public abstract static class SingletonC implements App_GeneratedInjector

My code is this:

HomeActivity

@AndroidEntryPoint
class HomeActivity : AppCompatActivity(), HomeContract.View {
    @Inject lateinit var presenter: HomeContract.Presenter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        presenter.helloM()
    }

    override fun hello() {
        Toast.makeText(this, "Hello World", Toast.LENGTH_SHORT).show()
    }
}

HomeModule

@Module
@InstallIn(ActivityComponent::class)
abstract class HomeModule {
    @Binds
    abstract fun bindActivity(homeActivity: HomeActivity): HomeContract.View

    @Binds
    abstract fun bindPresenter(homePresenter: HomePresenter): HomeContract.Presenter
}

@Module
@InstallIn(ActivityComponent::class)
object HomeActivityModule {
    @Provides
    fun povideActivity(activity: Activity): HomeActivity = activity as HomeActivity
}

RetrofitModule

@Module(includes = [AppModule::class])
@InstallIn(SingletonComponent::class)
class RetrofitModule {
    companion object {
        private const val BASE_URL = "https://url.com/"
    }

    @Provides
    @Singleton
    fun provideInterceptor() = HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY)

    @Provides
    @Singleton
    fun provideCacheFile(context: Context): File = context.cacheDir

    @Provides
    @Singleton
    fun provideCache(cacheFile: File) = Cache(cacheFile, (10 * 1024 * 1024).toLong()) //10MB Cahe

    @Provides
    @Singleton
    fun provideOkHttpClient(loggingInterceptor: HttpLoggingInterceptor, cache: Cache?): OkHttpClient {
        return OkHttpClient.Builder()
                .readTimeout(60, TimeUnit.SECONDS)
                .connectTimeout(60, TimeUnit.SECONDS)
                .addInterceptor(loggingInterceptor)
                .addInterceptor(Interceptor { chain: Interceptor.Chain ->
                    val request = chain.request()
                        .newBuilder()
                        .header("Accept", "application/json")
                        .header("Content-Type", "application/json")
                        .build()

                    chain.proceed(request)
                })
                .cache(cache)
                .build()
    }

    @Provides
    @Singleton
    fun provideGsonConverterFactory(): GsonConverterFactory = GsonConverterFactory.create()

    @Provides
    @Singleton
    fun provideRetrofit(okHttpClient: OkHttpClient, gson: GsonConverterFactory): Retrofit {
        return Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(gson)
                .client(okHttpClient)
                .build()
    }

    @Provides
    @Singleton
    fun provideHomeApi(retrofit: Retrofit): HomeApi = retrofit.create(HomeApi::class.java)
}

HomePresenter

class HomePresenter @Inject constructor(
    private val view: HomeContract.View?,
    private val homeApi: HomeApi
    ) : HomeContract.Presenter {

    override fun helloM() {
        view?.hello()
    }
}

HomeApi

interface HomeApi {
    @GET("users")
    fun getUsers(): Call<Any>?
}

I want to use HomeApi in HomePresenter to call REST API requests

Answer 1

Hilt comes with support for the most common Android classes. However, you might need to perform field injection in classes that Hilt doesn't support.In those cases, you can create an entry point using the @EntryPoint annotation , you can read more about it here , see this example for usage di module , ui