Dagger Android@ActivityKey未找到，如何显式创建子组件

Question

在dagger 2.25.2中找不到import dagger.android.ActivityKey，因此我无法显式添加子组件，而不是使用@ContributesInjector，使用ApplicationModule

@Module(subcomponents = [MainActivitySubComponent::class], includes = [DummyDependencyModule::class])
abstract class AppModule {
@Binds
abstract fun bindContext(application: Application): Context
@Binds
@IntoMap
@ActivityKey(MainActivity::class)
abstract fun bindInjectorFactory(builder: MainActivitySubComponent.Builder)
: AndroidInjector.Factory<out Activity>
@Module
companion object DummyDependencyModule {
@Provides
fun provideDummyDependency(context: Context): DummyDependency {
return DummyDependency(context)
}
}
}

应用程序组件是

@Component(modules = [AndroidSupportInjectionModule::class, AppModule::class])
interface AppComponent : AndroidInjector<DaggerApplication> {
@Component.Builder
interface Builder {
@BindsInstance
fun application(application: Application): Builder
fun build(): AppComponent
}
}

MainActivity子组件是

@Subcomponent
interface MainActivitySubComponent : AndroidInjector<MainActivity> {
@Subcomponent.Builder
abstract class Builder : AndroidInjector.Builder<MainActivity>()
}

我创建了一个活动密钥，因为它在dagger库中找不到

错误

错误：找不到符号，@ActivityKey(MainActivity.class(^symbol：类活动密钥位置：类应用程序模块

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_SETTER, AnnotationTarget.PROPERTY_GETTER)
@Retention(AnnotationRetention.RUNTIME)
@MapKey
internal annotation class ActivityKey(val value: KClass<out Activity>)

错误是

IllegalArgumentException: No injector factory bound for Class<cMainActivity>

Answer 1

检查生成的代码后，我发现它现在在AppModule 中用作@ClassKey

@ClassKey(MainActivity::class)
abstract fun bindInjectorFactory(builder: MainActivitySubComponent.Builder)
: AndroidInjector.Factory<*>

而不是

@Binds
@IntoMap
@ActivityKey(MainActivity::class)
abstract fun bindInjectorFactory(builder: MainActivitySubComponent.Builder)
: AndroidInjector.Factory<out Activity>

ClassKey代码为

@Documented
@Target(METHOD)
@Retention(RUNTIME)
@MapKey
public @interface ClassKey {
Class<?> value();
}