Android Hilt 使用两个 Retrofit2 客户端答案

【问题标题】：Android Hilt use two Retrofit2 clientsAndroid Hilt 使用两个 Retrofit2 客户端
【发布时间】：2021-02-23 09:29:43
【问题描述】：

我想用 Dagger Hilt 设置两个 Retrofit2 客户端，因为我的应用程序从两个不同的 api 获取信息。但是当我运行我的代码时，会引发以下异常 ->

App_HiltComponents.java:128: error: [Dagger/DuplicateBindings] retrofit2.Retrofit is bound multiple times:
      public abstract static class SingletonC implements HiltWrapper_ActivityRetainedComponentManager_ActivityRetainedComponentBuilderEntryPoint,
                             ^
          @org.jetbrains.annotations.NotNull @Provides retrofit2.Retrofit de.kotlinbooks.di.NetworkBooksModule.retrofitBooks(okhttp3.OkHttpClient)
          @org.jetbrains.annotations.NotNull @Provides retrofit2.Retrofit de.kotlinbooks.di.NetworkNYTModule.retrofitNYT(okhttp3.OkHttpClient)

我知道改造客户端是单例的，所以我将我的模块分成两个文件用于不同的 api。这是我的代码 ->

NetworkBooksModule

@Module
@InstallIn(SingletonComponent::class)
class NetworkBooksModule {

    @Provides
    fun okHttpClient(): OkHttpClient {
        val levelType: HttpLoggingInterceptor.Level = if (BuildConfig.DEBUG)
            HttpLoggingInterceptor.Level.BODY else HttpLoggingInterceptor.Level.NONE

        val logging = HttpLoggingInterceptor()
        logging.setLevel(levelType)

        return OkHttpClient.Builder()
            .addInterceptor(logging)
            .build()
    }

    @Provides
    fun retrofitBooks(okHttpClient: OkHttpClient): Retrofit {
        return Retrofit.Builder()
            .baseUrl("https://www.googleapis.com/books/v1/")
            .client(okHttpClient)
            .addConverterFactory(MoshiConverterFactory.create())
            .build()
    }

    @Provides
    fun bookService(retrofit: Retrofit): BookService {
        return retrofit.create(BookService::class.java)
    }

    @Provides
    fun bookClient(bookService: BookService): BookClient {
        return BookClient(bookService)
    }
}

NetworkNYTModule

@Module
@InstallIn(SingletonComponent::class)
class NetworkNYTModule {

    @Provides
    fun okHttpClient(): OkHttpClient {
        val levelType: HttpLoggingInterceptor.Level = if (BuildConfig.DEBUG)
            HttpLoggingInterceptor.Level.BODY else HttpLoggingInterceptor.Level.NONE

        val logging = HttpLoggingInterceptor()
        logging.setLevel(levelType)

        return OkHttpClient.Builder()
            .addInterceptor(logging)
            .build()
    }

    @Provides
    fun retrofitNYT(okHttpClient: OkHttpClient): Retrofit {
        return Retrofit.Builder()
            .baseUrl("https://api.nytimes.com/svc/books/v3/")
            .client(okHttpClient)
            .addConverterFactory(MoshiConverterFactory.create())
            .build()
    }

    @Provides
    fun nytService(retrofit: Retrofit): NYTService {
        return retrofit.create(NYTService::class.java)
    }

    @Provides
    fun nytClient(nytService: NYTService): NYTClient {
        return NYTClient(nytService)
    }
}

【问题讨论】：

使用限定符来提供相同类型的多个实现。更多细节在这里：developer.android.com/training/dependency-injection/…
你可以按照这个实现homanhuang.medium.com/…

标签： android kotlin retrofit2 dagger-hilt

【解决方案1】：

您可以使用界面来提供改造而不是改造本身

@Module
@InstallIn(SingletonComponent::class)
class NetworModule {

    @Provides
    fun retrofitNYT(okHttpClient: OkHttpClient): NYTService{
        return Retrofit.Builder()
            .baseUrl("https://api.nytimes.com/svc/books/v3/")
            .client(okHttpClient)
            .addConverterFactory(MoshiConverterFactory.create())
            .build()
            .create(NYTService::class.java)
    }

    @Provides
    fun retrofitBooks(okHttpClient: OkHttpClient): BookService{
        return Retrofit.Builder()
            .baseUrl("https://www.googleapis.com/books/v1/")
            .client(okHttpClient)
            .addConverterFactory(MoshiConverterFactory.create())
            .build()
            .create(BookService::class.java)
    }

}

【讨论】：