俺的 Dagger ベストプラクティス ref: http://qiita.com/eccyan/items/434349e112efac4dee52

file0.txt

[root: ApplicationModule] >[injects: Application.java]
　└──<[includes: AwesomeModule] 
　　　　　└──>[injects: LoginActivity.java]
　　　　　└──>[injects: ListActivity.java]
　　　　　└──>[injects: DetailActivity.java]

file1.java

@Module(
  includes = AwesomeModule.class,
  library = true
)
public class ApplicationModule {
  ...
}

file10.java

@Module(complete = false, library = true)
public class ApiModule.java {
  @Provides @Singleton
  public VideoDao provideYourService(RestAdapter adapter) { ... }
}

file11.java

public class AwesomeActivity extends Activity {
  @Inject
  VideoDao mVideoDao;

  @Inject
  UserDao mUserDao;

  ...
}

file12.java

@Module(
  injects = AwesomeActivity.class,
  includes = ApiModule.class
)
public class DaoModule {
  @Provides @Singleton
  public VideoDao provideVideoDao(YourService service) { ... }

  @Provides @Singleton
  public VideoDao provideUserDao(YourService service) { ... }
}

file13.diff

+ @Singleton
public class final VideoDao {
  final YourService mService;

+ @Inject
  public VideoDao(YourService service) { mService = service; }

  public Observable<VideoModel> get(int id) {
    return service.getVideo(id).first();
  }
}

+ @Singleton
public class final UserDao {
  final YourService mService;

+ @Inject
  public UserDao(YourService service) { mService = service; }

  public Observable<UserModel> get(int id) {
    return service.getUser(id).first();
  }
}

file14.java

// Application Module
@Module(
  includes = ApiModule.class,
  injects = YourApplication.class
)
public class ApplicationModule {
  ...
}

file15.java

// Awesome domain Module
@Module(
  injects = AwesomeActivity.class,
  addsTo = ApplicationModule.class,
  library = true
)
public class AwesomeModule {
}

file16.java

class MainPresenter {
  @Inject Provider<ChildPresenter> mChildProvider;

  private final List<ChildPresenter> mChilds = new ArrayList<>();

  public void OnViewInflated() {
    // Has 5 childs
    for (int i=0; i < childCount; i++) {
      final ChildPresenter presenter = mChildProvider.get();
      ((ChildView) getView().getChildAt(i)).setPresenter(presenter);
      mChilds.add(presenter);
    }    
  }

  public void fireChildEvent(int id) {
     mChilds.get(id).fire();
  }
}

class ChildPresenter {
  public void fire() { ... }
}

file17.java

class ChildView extend View {
  private ChildPresenter mPresenter;

  public void setPresenter(ChildPresenter presenter) { mPresenter = presenter; }
}

file18.java

class MainPresenter {　
  public void fireChildEvent(int id) {
     ((ChildView) getView().getChildAt(id)).getPresenter().fire();
  }
}

class ChildPresenter {
  public void fire() { ... }
}

file19.java

class ChildView extend View {
  @Inject
  Lazy<ChildPresenter> mPresenter;

  public ChildPresenter getPresenter() { return mPresenter.get(); }
}

file2.java

@Module(
  injects = {
    LoginActivity.class,
    ListActivity.class,
    DetailActivity.class
  },
  library = true
)
public class AwesomeModule {
  ...
}

file20.java

public class AwesomeFragment extends Fragment {
  final ObjectGraph mObjectGraph;

  @Override
  public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mObjectGraph = MainApplication.get(getActivity()).getObjectGraph()
          .plus(getDaggerModule());
        mObjectGraph.inject(this);
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
    final View view = inflater.inflate(R.layout.awesome_fragment,
      container, false);
    mObjectGraph.inject(view.findViewById(R.layout.awesome_view));
    return view;
  }

  ...
}

file21.java

public class AwesomeView extends FrameLayout {
  static public class Factory implements LayoutInflater.Factory {
    final ObjectGraph mObjectGraph;

    public Factory(ObjectGraph objectGraph) { mObjectGraph = objectGraph; }

    @Override
    public View onCreateView(String name, Context context, AttributeSet attrs) {
    // null を返すと標準のファクトリを使うので、型名で判定する。
    if (!name.equalsIgnoreCase(AwesomeView.class.getName())) {
      return null;
    }

    return new AwesomeView(context, attrs, mObjectGraph);
  }

  public AwesomeView(Context context, AttributeSet attrs, ObjectGraph objectGraph) {
    objectGraph.inject(this);
  }

  ...
}

file22.java

public class AwesomeFragment extends Fragment {
  final ObjectGraph mObjectGraph;

  @Override
  public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mObjectGraph = MainApplication.get(getActivity()).getObjectGraph()
          .plus(getDaggerModule());
        mObjectGraph.inject(this);
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
    final LayoutInflater daggerInflater = inflater.cloneInContext(getActivity);
    daggerInflater.setFactory(new AwesomeView.Factory(mObjectGraph));

    final View view = inflater.inflate(R.layout.awesome_fragment,
      container, false);
    return view;
  }

  ...
}

file3.txt

[root: ApplicationModule] >[injects: Application.java]
　├──<[addsTo: LoginModule] 
　│　　　└──>[injects: LoginActivity.java]
　├──<[addsTo: ListModule]
　│　　　└──>[injects: ListActivity.java]
　└──<[addsTo: DetailModule]
　　　　　└──>[injects: DetailActivity.java]

file4.java

@Module(
  includes = AwesomeModule.class,
  library = true
)
public class ApplicationModule {
  ...
}

file5.java

@Module(
  injects = LoginActivity.class,         
  addsTo = ApplicationModule.class,
  library = true
)
public class LoginModule {
  ...
}

file6.java

@Module(
  injects = ListActivity.class,         
  addsTo = ApplicationModule.class,
  library = true
)
public class ListModule {
  ...
}

file7.java

@Module(
  injects = DetailActivity.class,         
  addsTo = ApplicationModule.class,
  library = true
)
public class DetailModule {
  ...
}

file8.java

// Retrofit interface
interface YourService {
  getVideo(int id);
  getUser(int id);
}

file9.java

public class final VideoDao {
  final YourService mService;

  public VideoDao(YourService service) { mService = service; }

  public Observable<VideoModel> get(int id) {
    return service.getVideo(id).first();
  }
}

public class final UserDao {
  final YourService mService;

  public UserDao(YourService service) { mService = service; }

  public Observable<VideoModel> get(int id) {
    return service.getUser(id).first();
  }
}