如果没有@Providers注释的方法，则无法提供，组件中存在具有匹配键的绑定

Question

我试图在learn pourposes的种子项目中添加dagger2（我不是专家），但我有同样的问题：

E： /Users/foca/projects/personalProjects/bar-droid-application/bar-droid/app/build/tmp/kapt3/stubs/debug/com/bar/bar_droid/di/AppC： 8：错误：[Dagger/MissingBind]AccessScreenProvider_ProvideRoleSelectorFragmentFactory_javax.inject.如果没有@Provides-anttated方法，则无法提供注册库。公共抽象接口AppComponent扩展dagger.android.AndroidInjector{^A具有匹配键的绑定存在于组件：_com.bar.bar_java.util.。RoleSelectionFragmentSub_droid.ui.accessflow.di._注册库注入_com.bar.bar_UserSignstrationUseCase（registerRepository，...）_droid.domain.repository._UserregistrationUseCase注入_com.bar.bardroid.ui.accessflow.roleselectordroid.domain.interactor.userregistration.fragment.viewmodel.RoleSelectionViewModel（...，userregistrationUseCase）com.bar.bardroid.ui.accessflow.roleselectordroid.domain.interactor.userregistration.RoleSelectionViewModel注入com.bar.barcom.bar.bardroid.ui.di.ViewModelMomponent.javaRoleSelectionViewModel（角色选择视图模型）com.bar.bar地图，droid.domain.repository.提供商

这里我的代码：

应用程序：

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
    }
}

ActivityBuilderModule：

@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
}

ViewModelModule：

@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，为角色选择提供：

@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)
    }
}

我唯一的地方，我注入注册RepositoryImpl是在用户注册用例，我不知道我做错了什么。

Answer 1

奇怪的是，您在两个地方使用它：ViewModelModule。这很可能是问题和密钥复制错误。“组件中存在具有匹配键的绑定：”

此外，在provideMailPasswordFragmentFactory中，您只传递ViewModelModule，但在provideRoleSelectorFragmentFactory中，您同时传递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