[ContributeAndroidInjector] #dagger #subcomponent #activityscope

ActivityBuilderModule.kt

import dagger.Module
// required imports
@Module
class ActivityBuilderModule{
    @ActivityScope
    @ContributeAndoridInjector(modules = [ActivityModule::class])
    fun bindFeatureActivity(): FeatureActivity
}

ActivityModule.kt

import dagger.Module
import dagger.Provides
@Module(include = [FragmentBuilderModule::class]
class ActivityModule {
  
	@Provides
    fun providePresenter(): FeatureActivityPresenter = FeatureActivityPresenter()
	
  	@ActivityScope    
    @Provides
    fun provideFoo(): Foo = Foo()
    
}

AppComponent.kt

@Component(modules = [ActivityBuilderModule::class)
public interface AppComponent{
    fun inject(application: Application);
}

FeatureActivity.kt

import android.app.Activity
import android.os.Bundle
import javax.inject.Inject
class FeatureActivity : Activity() {
 
   @Inject
   lateinit var featureActivityPresenter: FeatureActivityPresenter
 
   override fun onCreate(savedInstanceState: Bundle?) {
       AndroidInjection.inject(this)
       super.onCreate(savedInstanceState)
   }
}

FeatureFragment.kt

import android.app.Fragment
import android.content.Context
import javax.inject.Inject
class FeatureFragment : Fragment() {
    @Inject
    lateinit var featureFragmentPresenter: FeatureFragmentPresenter
    override fun onAttach(context: Context?) {
        AndroidSupportInjection.inject(this)
        super.onAttach(context)
    }
}

FragmentBuilderModule.kt

import dagger.Module
// required imports
@Module
class FragmentBuilderModule {
  
	@FragmentScope
    @ContributeAndoridInjector(modules = [FragmentModule::class])
    fun bindFeatureFragment(): FeatureFragment
  
}

FragmentModule.kt

import dagger.Module
import dagger.Provides
@Module
class FragmentModule {
  
	@FragmentScope
    @Provides
    fun providePresenter(foo: Foo, bar: Bar): 
    FeatureFragmentPresenter = FeatureFragmentPresenter(foo)
    
	@Provides
    fun provideBar(): Bar = Bar()
    
}