ContributesAndroidInjector in a Subcomponent

Is there a way to add ContributesAndroidInjector for activity in a Subcomponent? I am trying to create a scope that works across a few activities.

What I have is this:

AppComponent

@Component(modules = [
    AndroidInjectionModule::class,
    AndroidSupportInjectionModule::class
])
interface AppComponent: AndroidInjector<DaggerApplication> {
    override fun inject(instance: DaggerApplication)
    fun chatComponent(): ChatComponent.Builder
    fun inject(needle: Needle)

    @Component.Builder
    interface Builder {
        @BindsInstance
        fun application(application: Application): AppComponent.Builder
        fun build(): AppComponent
    }
}

ChatScope

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

ChatComponent

@Subcomponent(modules = [ChatBindingModule::class])
@ChatScope
interface ChatComponent {

    @Subcomponent.Builder
    interface Builder {
        fun chatModule(chatModule: ChatModule): Builder
        fun build(): ChatComponent
    }

}

ChatBindingModule

@Module
abstract class ChatBindingModule {
    @ActivityScoped
    @ContributesAndroidInjector(modules = [])
    abstract fun chatListActivity(): ChatListActivity

    @ActivityScoped
    @ContributesAndroidInjector(modules = [])
    abstract fun chatDetailActivity(): ChatDetailActivity
}

With this code dagger fails to find injector for both activities. I guess I do know why that is happening but no idea how to solve this problem

[ronshapiro]

You’d need to provide custom code in your Application instance that would know how to access ChatComponent. Something like this:

class MyApplication : DaggerApplication {
  override fun activityInjector(): AndroidInjector<Activity> {
      return object : AndroidInjector<Activity> {
        override fun inject(activity: Activity) {
            if (activity.isChatActivity()) { 
              component.chatComponent().activityInjector().inject(activity)
            } else {
              component.activityInjector().inject(activity)
         }
     }
  }
}

[mladen1nf]

It seems there is no elegant way of doing this, so at the end I implemented it with standard Dagger approach