Dagger 2.15:Appcomponent-无法处理此界面 [英] Dagger 2.15: Appcomponent - was unable to process this interface

问题描述

我无法构建我的应用，并出现以下错误:

I cannot build my app with the following error:

 Task :app:kaptDebugKotlin
        debug/AppComponent.java:7: error: [ComponentProcessor:MiscError] dagger.internal.codegen.ComponentProcessor was unable to process this interface because not all of its dependencies could be resolved. Check for compilation errors or a circular dependency with generated code.
public abstract interface AppComponent {
            ^

我正在使用匕首2.15，并包括了所有依赖项:

I'm using dagger 2.15 and got all of it's dependencies included:

    implementation deps.dagger.runtime
    implementation deps.dagger.android
    implementation deps.dagger.android_support
    kapt deps.dagger.android_support_compiler
    kapt deps.dagger.compiler

AppComponent.kt

@Singleton
@Component(
    modules = [
        AndroidInjectionModule::class,
        AppModule::class,
        MainActivityModule::class]
)
interface AppComponent {
    @Component.Builder
    interface Builder {
        @BindsInstance
        fun application(application: Application): Builder
        fun build(): AppComponent
    }

    fun inject(app: App)
}

AppModule.kt 的代码:

@Module(includes = [ViewModelModule::class])
class AppModule {

    @Provides
    @Singleton
    fun provideApplication(app: App): Context = app

    @Singleton
    @Provides
    fun provideRetrofitService(): RetrofitService {
        return Retrofit.Builder()
            .baseUrl("https://dog.ceo/api/")
            .client(createClient())
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(LiveDataCallAdapterFactory())
            .build()
            .create(RetrofitService::class.java)
    }


    @Singleton
    @Provides
    fun provideDb(app: Application): CacheDb {
        return Room
            .databaseBuilder(app, CacheDb::class.java, "cache.db")
            .fallbackToDestructiveMigration()
            .build()
    }

    @Singleton
    @Provides
    fun provideUserDao(db: CacheDb): UserDao {
        return db.dogImagesDao()
    }

    private fun createClient(): OkHttpClient {
        val logger = HttpLoggingInterceptor.Logger { message -> Timber.tag("OkHttp").d(message) }

        val interceptor = HttpLoggingInterceptor(logger)
        interceptor.level = HttpLoggingInterceptor.Level.BODY

        return OkHttpClient.Builder()
                .addInterceptor(interceptor)
                .connectTimeout(30, TimeUnit.SECONDS)
                .writeTimeout(20, TimeUnit.SECONDS)
                .readTimeout(20, TimeUnit.SECONDS)
                .build()
    }
}

MainActivityModule.kt

@Suppress("unused")
@Module
abstract class MainActivityModule {
    @ContributesAndroidInjector(modules = [FragmentBuildersModule::class])
    abstract fun contributeMainActivity(): MainActivity
}

FragmentBuildersModule.kt的代码

Code of FragmentBuildersModule.kt

@Suppress("unused")
@Module
abstract class FragmentBuildersModule {
    @ContributesAndroidInjector
    abstract fun contributeUserFragment(): UserFragment
}

我总是在Dagger中遇到这种有限的错误.试图调试任务，但不再提供任何信息.希望任何人都可以暗示我一些事情.

I always run into this limited errors with Dagger. Tried to debug the task but doesn't give anymore information. Hopefully anyone else can hint me at something.

最后一件事.我还使用了 gradle wrapper 4.7 和 Android Studio 3.1.2

One last thing. I'm also using the gradle wrapper 4.7 and Android Studio 3.1.2

更新:

ViewModelModule.kt

@Suppress("unused")
@Module
abstract class ViewModelModule {
    @Binds
    @IntoMap
    @ViewModelKey(UserViewModel::class)
    abstract fun bindUserViewModel(userViewModel: UserViewModel): ViewModel

    @Binds
    abstract fun bindViewModelFactory(factory: ViewModelFactory): ViewModelProvider.Factory
}

推荐答案

我从Google示例GitHub复制了完全相同的代码，并遇到了相同的问题.事实证明，我解决该问题的方法是清除程序中的所有 other 错误，尤其是与导入模块有关的错误.因此，我的Room数据库部分代码出现了问题，并且出现了构建时错误.最初，我认为它与 AppComponent 错误无关.但是，在我清除它们之后，一切都很好.从某种意义上说，构建失败的模块是无法解析的依赖项.错误消息中的编译错误可能是一般性错误.

I had the exact same code copied from Google sample GitHub and experienced the same problem. The way I solved it, as it turns out, is to clear all other errors in your program, especially those related to the imported modules. So I had problem with my Room database part of the code and had build-time errors. Initially I thought it's unrelated to the AppComponent error. But after I cleared them, everything was fine. It kind of makes sense, an unsuccessfully built module is a dependency that cannot be resolved. And probably the compilation errors in the error message meant errors in general.

希望这对您有帮助

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