A: 5 - ui/main/MainActivityModule.java

MainActivityModule.java

@Module(includes = BaseActivityModule.class,
        subcomponents = MainFragmentSubcomponent.class)
abstract class MainActivityModule {

    // TODO (ContributesAndroidInjector) remove this in favor of @ContributesAndroidInjector
    @Binds
    @IntoMap
    @FragmentKey(MainFragment.class)
    abstract AndroidInjector.Factory<? extends Fragment>
    mainFragmentInjectorFactory(MainFragmentSubcomponent.Builder builder);

    @Binds
    @PerActivity
    abstract Activity activity(MainActivity mainActivity);

    @Binds
    @PerActivity
    abstract MainFragmentListener mainFragmentListener(MainActivity mainActivity);

}