CODEWITHSUNDEEP
androidkotlindagger-2
Artur A
Artur A

Reputation: 297

why Dagger could not recognize @Provides in AppModule?

I am getting this error:

[Dagger/MissingBinding] SessionFetcher cannot be provided without an @Inject constructor or an @Provides-annotated method. while you can see I have defined SessionFetcher

in AppModule class 


@Suppress("unused")
@Module
abstract class ViewModelModule {
  @Binds
  @IntoMap
  @ViewModelKey(AccountViewModel::class)
  abstract fun bindAccountViewModel(accountViewModel: AccountViewModel): ViewModel

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

@Module(includes = [ViewModelModule::class])
class AppModule(private val applicationContext: Context) {

  @Provides
  fun sessionFetcher(@Named("UserPreferences") userPreferences: SharedPreferences): ISessionFetcher {
    return SessionFetcher(userPreferences)
  }

  @Singleton
  @Provides
  @Named("UserPreferences")
  fun userPreferences(context: Context): SharedPreferences {
    return context.getSharedPreferences(USER_CONFIG_NAME, Context.MODE_PRIVATE)
  }



class AccountViewModel @Inject constructor(sessionFetcher: SessionFetcher) :
    SessionViewModel(sessionFetcher), AppComponent.Injectable {

Upvotes: 1

Views: 110

Answers (1)

Bartek Lipinski
Bartek Lipinski

Reputation: 31458

You're providing ISessionFetcher inside your graph, but you're trying to inject an instance of SessionFetcher.

What you're providing to the graph is the type you can inject. Dagger does not analyze bodies of @Providing functions (or types for the eventual implementing class).

Just inject the interface instead of the implementing class.

class AccountViewModel @Inject constructor(sessionFetcher: ISessionFetcher) :
    SessionViewModel(sessionFetcher), AppComponent.Injectable {
    //...
}

if you need to use methods of SessionFetcher that are not exposed by the ISessionFetcher, then your ISessionFetcher is probably incomplete.

Upvotes: 1

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