Cooking Clean Architecture sample code, used to present on Codemotion Tel Aviv 2015 (Absolutely non compilable pseudocode samples to show concepts)

clean_arch_samples.java

// Sample basket data entity

class BasketItem{
  int id;
  String name;
  String imageUrl;
  int quantity;
  float price;
}

// Model - location wrapper

interface LocationWrapper {
  void requestLocation(…);
}

class LocationWrapperImpl implements LocationWrapper {

GoogleApiClient apiClient;

  @Override void requestLocation(…){

// setup callbacks etc…

LocationServices.FusedLocationApi.getLastLocation( apiClient);
  }
}

// Presenter 

interface BasketPresenter {

  void initialise(BasketView view);

  void itemQuantityChanged(BasketItem basketItem);

void viewDestroyed();

}

// Clean presenter with interactors

interface Interactor<T> {

  void performAction<T action>(InteractionCallback<T> actionCallback);
} 

class CleanBasketPresenterImpl implements BasketPresenter {

  @Override void initialise(BasketView view){
    basketView = view;
  }

  @Override void itemQuantityChanged(BasketItem basketItem){
    updateItemQuantityInteractor.performAction(basketItem);
  }
}

// Cleanish presenter with tight coupling to the API

class CleanishBasketPresenterImpl implements BasketPresenter {

  @Override void initialise(BasketView view){
    basketView = view;
  }

  @Override void itemQuantityChanged(BasketItem basketItem){
    basketAPI.updateItemQuantity(basketItem);
  }
}

// View

interface BasketView {

  void showItems(List<BasketItem> basketItems);

  void update(BasketItem basketItem);

  void proceedToCheckout();
}

class BasketActivity extends Activity implements BasketView {

  BasketPresenter presenter;
  Button button;
  
  @Override public void onCreate(Bundle icicle){
    // view stuff
    
    presenter.initialise(this);
    button.setOnClickListener(addToBasketListener);
  }

  OnClickListener addToBasketListener = new OnClickListener {
    @Override public void onClick(View v){
      presenter.itemQuantityChanged(basketItemWithNewQuantity);
    }
  }

  @Override void update(BasketItem basketItem){
    
    basketViewsList.getView(basketItem.id).setData(basketItem);
  }

  @Override void proceedToCheckout(){
    startActivity(CheckoutActivity.buildIntent(this, basketItems));
  }
}