我使用带有限定符的@Provides方法跟随模块
@Module
class VocabularyModule {
@VocabularyProviders
@Singleton
@Provides
fun provideVocabularies(): List<VocabularyProvider> {
return listOf(
AnimalsVocabularyProvider(),
FamilyVocabularyProvider(),
FoodVocabularyProvider(),
NumberVocabularyProvider(),
ColorsVocabularyProvider(),
FreeTimeVocabularyProvider(),
SportVocabularyProvider(),
NatureVocabularyProvider(),
PeopleVocabularyProvider(),
TransportationVocabularyProvider()
)
}
}
@Qualifier
@Retention(AnnotationRetention.RUNTIME)
annotation class VocabularyProviders
然后有我的类,我想将此列表注入via构造函数和限定符:
class VocabularyFactory
@Inject constructor(@param:VocabularyProviders val providers: List<VocabularyProvider>) {
fun getVocabulary(category: VocabularyCategory): Vocabulary {
for (provider in providers) {
if (category == provider.category) {
return provider.vocabulary
}
}
throw IllegalStateException("didn't find provider that could provide vocabulary of $category category")
}
}
我收到此错误,但一切看起来都正确
11: error: [Dagger/MissingBinding] [dagger.android.AndroidInjector.inject(T)] @cz.ejstn.learnlanguageapp.core.dagger.module.vocabulary.VocabularyProviders java.util.List<? extends cz.ejstn.learnlanguageapp.vocabulary.model.factory.VocabularyProvider> cannot be provided without an @Provides-annotated method.
我继续翻阅类似的问题并遇到了这个问题:Dagger 2 multibindings with Kotlin
所以从我的理解kotlin编译器“混乱”与参数中的泛型类型,这导致匕首无法链接这些我猜。
我改变了工厂的构造函数,以避免这种情况 - addind @JvmSuppressWildcards注释:
class VocabularyFactory
@Inject constructor(@param:VocabularyProviders val providers:@JvmSuppressWildcards List<VocabularyProvider>) {
...
}
保持这个问题,因为更多的人可能会遇到这个问题