Question

我正在尝试在Android应用中从Dagger 2.7升级到Dagger 2.21。到目前为止，这主要涉及向子组件添加新的作用域，因为这在Dagger 2.8+中得到了实施，但在Dagger 2.7中却没有。我因一个错误被困了几个小时，我希望有人可以帮助我过去。错误是这样的：

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

尽管我在模块中有一个@Provides方法：

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

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

我从片段中提供了SurveyCampaign：

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

似乎无法获得调查广告系列的类是SurveyTracker，其构造函数如下所示：

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

是的，我们的项目是Kotlin和Java的混合，逐渐向越来越多的Kotlin过渡。

错误消息的其余部分，为简洁起见，已删除软件包名称：

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]

完整的，未编辑的错误堆栈：

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]

这是组件：

@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

我终于明白了。我一直在想：“感觉SurveyTracker和SurveyPlayerFragment（实际上是创建模块并将surveyCampaign传递到模块）不在同一范围内。”我从非Dagger的角度考虑这个问题，但事实证明，SurveyTracker类是用@ActivityScope范围注释的，而不是像组件和模块中的其他所有注释那样的@FragmentScope注释的。将其更改为@FragmentScope可以修复它。由于某些原因，我没有考虑过检查SurveyTracker上的注释，因为我不认为这是您可以做的。大卫，谢谢您的帮助。

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

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