Android Dagger get Parent Fragment into child fragment

I have been trying to, unsuccessfully, inject the Parent Fragment into its sub fragments for navigation purposes. I have followed a couple of different posts but I can't seem to understand what am I missing in my implementation.

I have a MainActivity that contains a ViewPager with one such page containing EventsFragment. This fragment in turn has two child fragments EventsListFragment and EventsDetailFragment. I wanted to inject EventsFragment fragment into EventsListFragment so that I can tell it to navigate to EventsDetailFragment.

MainActivity

ViewPager

EventsFragment

EventsListFragment

EventsDetailFragment

EventsFragment

EventsListFragment

EventsDetailFragment

I know this is probably a repetition of the posts below and I really apologize for that but I honestly cannot see what am I missing. These are the posts I've found:

My implementation is as follows:

ApplicationComponent

@Singleton
@Component(modules = [
AndroidSupportInjectionModule::class,
ActivityModule::class,
BaseApplicationModule::class,
ApplicationModule::class])
interface ApplicationComponent : AndroidInjector<AndroidApplication>

@Component.Builder
abstract class Builder : AndroidInjector.Builder<AndroidApplication>()



ActivityModule

@Module(includes = [MainActivityProvider::class])
abstract class ActivityModule




MainActivityProvider

@Module(includes = [EventsFragmentProvider::class])
abstract class MainActivityProvider
@PerActivity
@ContributesAndroidInjector(modules = [MainActivityModule::class])
abstract fun provideMainActivityFactory(): MainActivity



EventsFragmentProvider

@Module(includes = [EventsListProvider::class,
EventsDetailProvider::class])
abstract class EventsFragmentProvider
@PerFragment
@ContributesAndroidInjector(modules = [EventsFragmentModule::class])
abstract fun provideEventsFragmentFactory(): EventsFragment



EventsFragmentModule

@Module
class EventsFragmentModule
@Binds
abstract fun providesEventListView(eventsFragment: EventsFragment): EventContract.Flow



EventsListProvider

@Module
abstract class EventsListProvider
@PerFragment
@ContributesAndroidInjector(modules = [EventsListModule::class])
abstract fun provideEventsListFragmentFactory(): EventsListFragment



EventsFragment

class EventsFragment : DaggerFragment(), EventContract.Flow
override fun navigateToList()
addFragment(navigator.getEventsListFragment(context!!))


override fun navigateToDetail(id: String)
println("id = $id")


...



EventContract

interface EventContract
interface Flow
fun navigateToList()

fun navigateToDetail(id: String)




EventsListFragment

class EventsListFragment : DaggerFragment()
@Inject
lateinit var eventsFlow: EventContract.Flow

...




[Dagger/MissingBinding] [dagger.android.AndroidInjector.inject(T)] EventContract.Flow cannot be provided without an @Provides-annotated method.
public abstract interface ApplicationComponent extends dagger.android.AndroidInjector<AndroidApplication> {
^
EventContract.Flow is injected at
EventsListFragment.eventsFlow
EventsListFragment is injected at
dagger.android.AndroidInjector.inject(T)
component path: ApplicationComponent →EventsListProvider_ProvideEventsListFragmentFactory.EventsListFragmentSubcomponent


I may be using a anti-pattern but this is what got me working to this point. Im open to changes that may help me achieve this

1 Answer
1

The error is caused by the following module:

@Module
class EventsFragmentModule
@Binds
abstract fun providesEventListView(eventsFragment: EventsFragment): EventContract.Flow



Dagger would not provide you with a Fragment and you shouldn't do that.

Fragment

Moreover, I think you misunderstand the meaning of @ContributesAndroidInjector. It means creating an AndroidInjector for you but proving an instance.

@ContributesAndroidInjector

AndroidInjector

@Module
abstract class EventsListProvider
@PerFragment
@ContributesAndroidInjector(modules = [EventsListModule::class])
abstract fun provideEventsListFragmentFactory(): EventsListFragment



So you should pass your EventsFragment instance into the module like this post instead of using field injection.

EventsFragment

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