I have an app component and a dependent component. The app component declares explicit dependencies, and the dependent component can inject those. However, when I have a dependency that I have to disambiguate with a @Qualifier, the dependent component is not able to inject that dependency.
This is the app component
@Component(modules = [AppModule::class, SchedulersModule::class, StorageModule::class])
@ApplicationScope
interface AppComponent {
fun inject(app: Application)
/* other stuff omitted for brevity */
val bitmapCache: BitmapCache
@UiScheduler fun uiScheduler(): Scheduler
}
This is the scheduler module:
@Module
class SchedulersModule {
@ApplicationScope
@Provides
@IoScheduler
fun provideIoScheduler(): Scheduler = Schedulers.io()
@ApplicationScope
@Provides
@UiScheduler
fun provideMainThreadScheduler(): Scheduler = AndroidSchedulers.mainThread()
}
This is the qualifier:
@Qualifier
@Retention(AnnotationRetention.RUNTIME)
annotation class UiScheduler
And this is the dependent component:
@Component(
dependencies = [AppComponent::class],
modules = [EditEntryActivityModule::class, ViewModelModule::class]
)
@ActivityScope
interface EditEntryActivityComponent {
fun inject(editEntryActivity: EditEntryActivity)
fun inject(editEntryFragment: EditEntryFragment)
}
This is how the scheduler is injected in the fragment:
class EditEntryFragment : Fragment() {
@Inject @UiScheduler lateinit var uiScheduler: Scheduler
/* other stuff */
}
So why can the dependent component inject the bitmap cache, declared in the parent component, but not the UI scheduler? This is the error I get:
error: io.reactivex.Scheduler cannot be provided without an @Provides- or @Produces-annotated method.
io.reactivex.Scheduler is injected at
com.test.edit.EditEntryFragment.uiScheduler
com.test.edit.EditEntryFragment is injected at
com.test.edit.EditEntryActivityComponent.inject(arg0)
1 error