dagger2 subcomponent

ActivitiesModule.java

@Module abstract class ActivitiesModule {

  @ActivityScope @ContributesAndroidInjector(modules = { MainActivityModule.class })
  abstract MainActivity mainActivity();
}

ApplicationComponent.java

@Singleton @Component(modules = {
    RepositoryModule.class, AndroidSupportInjectionModule.class, ActivitiesModule.class
}) public interface MyApplicationComponent extends AndroidInjector<MyApplication> {

  @Component.Builder abstract class Builder extends AndroidInjector.Builder<MyApplication> {
  }
}

BaseActivity.java

public abstract class BaseActivity extends RxAppCompatActivity {
  ...
  @CallSuper @Override protected void onCreate(@Nullable Bundle savedInstanceState) {
    AndroidInjection.inject(this);
    super.onCreate(savedInstanceState);
  }
  ...
}

BaseFragment.java

public abstract class BaseFragment extends RxFragment {
  ...
  @CallSuper @Override public void onAttach(Activity activity) {
    AndroidSupportInjection.inject(this);
    super.onAttach(activity);
  }
  ...
}

HomeFragment.java

public class HomeFragment extends BaseFragment {
  @Inject HomePresenter presenter;
}

MainActivity.java

 @ActivityScope public class MainActivity extends BaseActivity implements HasSupportFragmentInjector {
      @Inject DispatchingAndroidInjector<Fragment> fragmentInjector;
     
     ...
   
     @Override public AndroidInjector<Fragment> supportFragmentInjector() {
    return fragmentInjector;
  } 
 }

MainActivityModule.java

@Module public abstract class MainActivityModule {

  @Provides @Reusable static RxPermissions provideRxPermissions(MainActivity mainActivity) {
    return new RxPermissions(mainActivity);
  }

  @ContributesAndroidInjector abstract HomeFragment homeFragment();
}

RepositoryModule.java

@Module public class RepositoryModule {

  @Provides @Singleton
  public SharedPreferences provideSharedPreferences(MyApplication app) {
    return app.getSharedPreferences("default", Context.MODE_PRIVATE);
  }

}