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android - 如果没有 @Provides-annotated 方法就无法提供，组件中存在具有匹配键的绑定

问题描述

我正在尝试在种子项目中添加 dagger2 来学习 pourposes（我不是专家），但我遇到了同样的问题：

e：/Users/foca/projects/personalProjects/bar-droid-application/bar-droid/app/build/tmp/kapt3/stubs/debug/com/bar/bar_droid/di/AppComponent.java:8：错误：[ Dagger/MissingBinding] com.bar.bar_droid.domain.repository.RegisterRepository 不能在没有@Provides-annotated 方法的情况下提供。public abstract interface AppComponent extends dagger.android.AndroidInjector { ^ 组件中存在具有匹配键的绑定：com.bar.bar_droid.ui.accessflow.di.AccessScreenProvider_ProvideRoleSelectorFragmentFactory.RoleSelectionFragmentSubcomponent com.bar.bar_droid.domain.repository.RegisterRepository 注入com.bar.bar_droid.domain.interactor.userregistration.UserRegistrationUseCase(registerRepository, ...) com.bar.bar_droid.domain.interactor.userregistration。

这是我的代码：

应用：

class MainApplication : Application(), HasAndroidInjector {

    @Inject lateinit var androidInjector : DispatchingAndroidInjector<Any>

    override fun onCreate() {
        super.onCreate()

        // Starts Dagger
        DaggerAppComponent.builder()
            .application(this)
            .build()
            .inject(this)
    }

    override fun androidInjector(): AndroidInjector<Any> = androidInjector
}

匕首组件：

@Singleton
@Component(
    modules = [AndroidSupportInjectionModule::class,
        ApplicationModule::class,
        RoomDatabaseModule::class,
        FirebaseModule::class,
        GoogleModule::class,
        ActivityBuilderModule::class]
)
interface AppComponent : AndroidInjector<MainApplication> {

    @Component.Builder
    interface Builder {
        @BindsInstance
        fun application(app: Application): Builder
        fun build(): AppComponent
    }
}

活动生成器模块：

@Module
abstract class ActivityBuilderModule {

    @PerActivity
    @ContributesAndroidInjector(modules = [AccessScreenProvider::class, AccessScreenDependencyProvider::class])
    abstract fun bindAccessActivity(): AccessActivity

    @PerActivity
    @ContributesAndroidInjector(modules = [MainFlowProvider::class])
    abstract fun bindMainActivity(): MainActivity
}

AccessActivity 的片段：

@Module
abstract class AccessScreenProvider {

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class, LoginSelectorProvider::class])
    abstract fun provideLoginSelectorFragmentFactory(): LoginFragment

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class])
    abstract fun provideMailPasswordFragmentFactory(): MailPasswordSignUpFragment

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class, RoleSelectionProvider::class])
    abstract fun provideRoleSelectorFragmentFactory(): RoleSelectionFragment
}

视图模型模块：

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
@Retention(AnnotationRetention.RUNTIME)
@MapKey
internal annotation class ViewModelKey(val value: KClass<out ViewModel>)

@Module
abstract class ViewModelModule {

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

    @Binds
    @PerFragment
    @IntoMap
    @ViewModelKey(LoginViewModel::class)
    abstract fun provideLoginViewModel(loginViewModel: LoginViewModel): ViewModel

    @Binds
    @PerFragment
    @IntoMap
    @ViewModelKey(MailPasswordSignUpViewModel::class)
    abstract fun provideMailPasswordSighUpViewModel(mailPasswordSignUpViewModel: MailPasswordSignUpViewModel): ViewModel

    @Binds
    @PerFragment
    @IntoMap
    @ViewModelKey(RoleSelectionViewModel::class)
    abstract fun provideRoleSelectionViewModel(roleSelectionViewModel: RoleSelectionViewModel): ViewModel
}

最后对于 RoleSelectionProvide：

@Module
class RoleSelectionProvider {

    @Provides
    @PerFragment
    fun provideRealAuthDataSource(fireBaseAuth: FirebaseAuth): UserAuthDataSource = RealUserAuthDataSource(fireBaseAuth)

    @Provides
    @PerFragment
    fun provideRegisterRepository(realUserAuthDataSource: RealUserAuthDataSource, userProfileDao: UserProfileDao): RegisterRepository {
        return RegisterRepositoryImpl(realUserAuthDataSource, userProfileDao)
    }
}

我注入RegisterRepositoryImpl的唯一地方是UserRegistrationUseCase，我不知道我做错了什么。

标签： androidkotlindependency-injectiondagger-2dagger

解决方案

奇怪的是你在两个地方使用它：ViewModelModule。这很可能是问题和重复键错误。“组件中存在具有匹配键的绑定：”

同样在provideMailPasswordFragmentFactory 中，您只传递了ViewModelModule，但在providerRoleSelectorFragmentFactory 中，您同时传递了ViewModelModule 和RoleSelectionProvider。在第一种情况下，您缺少提供存储库的 RoleSelectionProvider 提供的依赖项。

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class])
    abstract fun provideMailPasswordFragmentFactory(): MailPasswordSignUpFragment

    @PerFragment
    @ContributesAndroidInjector(modules = [ViewModelModule::class, RoleSelectionProvider::class])
    abstract fun provideRoleSelectorFragmentFactory(): RoleSelectionFragment

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