Legacy MV vs MVP

MVvsMVP.java

/**
 * Legacy
 */
public class ActivityA {
  public void onCreate(A state) {
    Volley.getList(new Callback() {
      public void onSuccess(List<Image> list) {
        showImageList(List<Image> list);
      }

      public void onError() {
        // todo handling error
      }
    });
  }

  public void showImageList(List<Image> list) {
    // todo update RecyclerView
  }
}


/**
 * MVP
 */
 public interface MainView {
  public void showImageList(List<Image> list);
}

public interface MainPresenter {
  void setView(MainView view);
  void getIOIImages();
}

public interface IOIImageManager {
  void setPresenter(MainPresenter presenter);
  void getIOIImages();
}
// view
public class ActivityA implement MainView {
  MainPresenter presenter;

  public void onCreate(A state) {
    // presenter = new MainPresenterImpl();
    presenter.setView(this);
    presenter.getIOIImages();
  }

  public void showImageList(List<Image> list) {
    // todo update RecyclerView
  }
}

// presenter
public class MainPresenterImpl implements MainPresenter{
  WeakReference<MainView> view;
  IOIImageManager model = new IOIImageManagerImpl();

  void setView(MainView view) {
    this.view = new WeakReference<>(view);
  }

  void getIOIImages() {
    // todo access remote data
    manager.getIOIImages(new Callback() {
      public void onResponse(List<Image> list) {
        // sorting. filtering. businessl logic.
        if(view.get() != null)
          view.get().showImageList(list);
      }
    });
  }
}

// model
public class IOIImageManagerImpl implements IOIImageManager {
  MainPresenter presenter;
  void setPresenter(MainPresenter presenter) {
    this.presenter = presenter;
  }
  public void getIOIImages() {
    // todo real access to remote data
    presenter.onResponse(list);
  }
}