CODEWITHSUNDEEP
javaandroidkotlindagger-2
Sirop4ik
Sirop4ik

Reputation: 5233

Why I get @Provides-annotated error?

I have already spent hours try to find in google what is the difference of my two dagger implementation. It was implemented like this

@Module
class MatchesModule
{
@Provides
@NetworkScope
@IntoMap
@RetrofitModulesName(eRetrofitModules.MATCHES)
fun retrofitMatches(okHttpClient: OkHttpClient, rxAdaptor: RxJava2CallAdapterFactory, iBuilder: Retrofit.Builder): Retrofit = iBuilder.addConverterFactory(GsonConverterFactory.create(mDeserializerMatches));
}

This method provide Retrofit object, also I am using annotation @IntoMap and @RetrofitModulesName(...) in order to put all of this Retrofit objects to map.

@Module
class PreviewModule
{
@Provides
@PreviewScope
fun provideMatchesPresenter(retrofitModules: Map<eRetrofitModules, Retrofit>): IMatchPresenter = MatchPresenter(retrofitModules)
}

I am getting all Retrofit object and passing them to MathcPresenter all is ok and fine. But I would like to get Map<Foo, Provider<Retrovit>> in my presenter. So, I added this word Provider to argument 

@Provides
@PreviewScope
fun provideMatchesPresenter(retrofitModules: Map<eRetrofitModules, 
Provider<Retrofit>>): IMatchPresenter = MatchPresenter(retrofitModules)

as well as to the constructor of MathcPresenter

class MatchPresenter(retrofitModules: Map<eRetrofitModules, Provider<Retrofit>>): IMatchPresenter

And now I can not undersand why, but I get such error

Error:(6, 1) error: [com.example.alexeyt.sunshinekotlin.moduls.previewmodule.PreviewComponent.inject(com.example.alexeyt.sunshinekotlin.ui.fragments.previewFragments.PreviewFragment)] java.util.Map> cannot be provided without an @Provides-annotated method.

PreviewScope

@Scope
@Retention(AnnotationRetention.RUNTIME)
annotation class PreviewScope

What am I doing wrong?

Upvotes: 0

Views: 98

Answers (1)

Thibault Seisel
Thibault Seisel

Reputation: 1257

This might be a problem with how Kotlin handles generics wildcards.

When using Dagger 2 Multibindinds, the type of the Map is interpreted by Dagger (which uses Java Reflection to analyse your code and generate Component implementations) as Map<eRetrofitModules, ? extends Provider<Retrofit>>. This happens because maps in Kotlin have their V type parameter marked as out.

@JvmSuppressWildcards annotation removes that information from the compiled code. Just use that annotation on Provider<Retrofit>:

Map<eRetrofitModules, @JvmSuppressWildcards Provider<Retrofit>>.

You may also find this answer interesting.

Upvotes: 2

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