在Android上从Dagger 2.7升级到Dagger 2.21时的Dagger 2构建错误

Question

I am attempting to upgrade from Dagger 2.7 to Dagger 2.21 in an Android app. So far, that has mostly involved adding new scopes to subcomponents, as this is enforced in Dagger 2.8+, but wasn't in Dagger 2.7. I have been stuck for a few hours on an error that I was hoping someone could help me get past. The error is this:

error: [Dagger/MissingBinding] com.experticity.android.member.model.card.survey.SurveyCampaign cannot be provided without an @Inject constructor or an @Provides-annotated method.

I have an @Provides method in a module though:

@Module
class SurveyPlayerModule(private val surveyCampaign: SurveyCampaign) {

    @Provides
    @FragmentScope
    fun provideSurveyCampaign(): SurveyCampaign {
        return surveyCampaign
    }
}

And I provide that surveyCampaign from my fragment:

getComponent().surveyPlayerFragmentComponent(
                    new SurveyPlayerModule(mSurveyCampaign), new FragmentModule(this));

The class that doesn't seem to be able to get the survey campaign is the SurveyTracker and the constructor looks like this:

@Inject
public SurveyTracker(UserRepository userRepository, CampaignRepository campaignRepository, SurveyCampaign surveyCampaign) {// Set all of the fields from the constructor parameters}

And yes, our project is a mix of Kotlin and Java, moving gradually towards more and more Kotlin.

And the rest of the error message, with package names removed for brevity:

SurveyCampaign is injected at SurveyTracker(…, surveyCampaign)

SurveyTracker is provided at SurveyPlayerFragmentComponent.surveyTracker() [ApplicationComponent → SessionComponent → RepositoryComponent → activity.ActivityComponent → activity.SurveyPlayerFragmentComponent]

  The following other entry points also depend on it:
      SurveyPlayerFragmentComponent.inject(SurveyPlayerViewModel) [ApplicationComponent → SessionComponent → RepositoryComponent → activity.ActivityComponent → activity.SurveyPlayerFragmentComponent]

      SurveyPlayerFragmentComponent.inject(SurveyQuestionViewModel) [ApplicationComponent → SessionComponent → RepositoryComponent → activity.ActivityComponent → activity.SurveyPlayerFragmentComponent]

      SurveyPlayerFragmentComponent.inject(SurveyCompletedViewModel) [ApplicationComponent → SessionComponent → RepositoryComponent → activity.ActivityComponent → activity.SurveyPlayerFragmentComponent]

The full, un-edited error stack:

ApplicationComponent.java:11: error: [Dagger/MissingBinding] com.experticity.android.member.model.card.survey.SurveyCampaign cannot be provided without an @Inject constructor or an @Provides-annotated method.
public abstract interface ApplicationComponent {
                ^
      com.experticity.android.member.model.card.survey.SurveyCampaign is injected at
          com.experticity.android.member.domain.SurveyTracker(…, surveyCampaign)
      com.experticity.android.member.domain.SurveyTracker is injected at
          com.experticity.android.member.ui.viewmodel.SurveyPlayerViewModel.mSurveyTracker
      com.experticity.android.member.ui.viewmodel.SurveyPlayerViewModel is injected at
          com.experticity.android.member.injection.component.activity.SurveyPlayerFragmentComponent.inject(com.experticity.android.member.ui.viewmodel.SurveyPlayerViewModel) [com.experticity.android.member.injection.component.ApplicationComponent → com.experticity.android.member.injection.component.SessionComponent → com.experticity.android.member.injection.component.RepositoryComponent → com.experticity.android.member.injection.component.activity.ActivityComponent → com.experticity.android.member.injection.component.activity.SurveyPlayerFragmentComponent]
  The following other entry points also depend on it:
      com.experticity.android.member.injection.component.activity.SurveyPlayerFragmentComponent.inject(com.experticity.android.member.ui.viewmodel.SurveyQuestionViewModel) [com.experticity.android.member.injection.component.ApplicationComponent → com.experticity.android.member.injection.component.SessionComponent → com.experticity.android.member.injection.component.RepositoryComponent → com.experticity.android.member.injection.component.activity.ActivityComponent → com.experticity.android.member.injection.component.activity.SurveyPlayerFragmentComponent]
      com.experticity.android.member.injection.component.activity.SurveyPlayerFragmentComponent.inject(com.experticity.android.member.ui.viewmodel.SurveyCompletedViewModel) [com.experticity.android.member.injection.component.ApplicationComponent → com.experticity.android.member.injection.component.SessionComponent → com.experticity.android.member.injection.component.RepositoryComponent → com.experticity.android.member.injection.component.activity.ActivityComponent → com.experticity.android.member.injection.component.activity.SurveyPlayerFragmentComponent]

And here is the component:

@FragmentScope
@Subcomponent(modules = [SurveyPlayerModule::class, FragmentModule::class])
interface SurveyPlayerFragmentComponent {

    @ChildFragmentManager
    fun childFragmentManager(): FragmentManager

    fun surveyTracker(): SurveyTracker

    //Fragments

    fun inject(fragment: SurveyPlayerFragment)

    // ViewModels

    fun inject(viewModel: SurveyPlayerViewModel)

    fun inject(viewModel: SurveyQuestionViewModel)

    fun inject(viewModel: SurveyCompletedViewModel)

    // Adapters

    fun inject(adapter: SurveyPlayerAdapter)
}

Answer 1

I finally figured it out. I kept on thinking, "It feels like SurveyTracker and SurveyPlayerFragment (which actually creates the module and passes the surveyCampaign to the module) are not in the same scope." I was thinking about this from a non-Dagger perspective, but it turns out that the SurveyTracker class was annotated with the @ActivityScope scope instead of @FragmentScope like everything else in the component and module. Changing it to @FragmentScope fixed it. For some reason I had not thought of checking for annotations on the SurveyTracker , because I didn't think that was something you would do. Thank you for your help, David.