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@Module
public abstract class BaseFragmentModule {

    public static final String FRAGMENT = "BaseFragmentModule.fragment";

    static final String CHILD_FRAGMENT_MANAGER = "BaseFragmentModule.childFragmentManager";

    @Provides
    @Named(CHILD_FRAGMENT_MANAGER)
    @PerFragment

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@Module
public abstract class BaseChildFragmentModule {
  
    public static final String CHILD_FRAGMENT = "BaseChildFragmentModule.childFragment";
}

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@Singleton
public final class SingletonUtil {

    @Inject
    SingletonUtil() {
    }
  
    public String doSomething() {
        return "SingletonUtil: " + hashCode();
    }

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@PerActivity
public final class PerActivityUtil {

    private final Activity activity;

    @Inject
    PerActivityUtil(Activity activity) {
        this.activity = activity;
    }

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@PerFragment
public final class PerFragmentUtil {

    private final Fragment fragment;

    @Inject
    PerFragmentUtil(@Named(BaseFragmentModule.FRAGMENT) Fragment fragment) {
        this.fragment = fragment;
    }
  

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@PerChildFragment
public final class PerChildFragmentUtil {

    private final Fragment childFragment;

    @Inject
    PerChildFragmentUtil(@Named(BaseChildFragmentModule.CHILD_FRAGMENT) Fragment childFragment) {
        this.childFragment = childFragment;
    }

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public final class MainFragment extends BaseFragment implements View.OnClickListener {

    @Inject
    MainFragmentListener listener;

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.main_fragment, container, false);
    }

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interface MainFragmentListener {

    void onExample1Clicked();

    void onExample2Clicked();

    void onExample3Clicked();
}

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@Module(includes = BaseFragmentModule.class)
abstract class MainFragmentModule {

    @Binds
    @Named(BaseFragmentModule.FRAGMENT)
    @PerFragment
    abstract Fragment fragment(MainFragment mainFragment);
}

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// TODO (ContributesAndroidInjector) remove this in favor of @ContributesAndroidInjector
@PerFragment
@Subcomponent(modules = MainFragmentModule.class)
public interface MainFragmentSubcomponent extends AndroidInjector<MainFragment> {

    @Subcomponent.Builder
    abstract class Builder extends AndroidInjector.Builder<MainFragment> {
    }
}