（三二）HarmonyOS Design 的应用架构设计：常用架构与实践 原创

// 模型层：处理计算逻辑                class CalculatorModel {                    public int add(int a, int b) {                        return a + b;                    }                                    public int subtract(int a, int b) {                        return a - b;                    }                }                                // 视图层：展示界面                import ohos.aafwk.ability.AbilitySlice;                import ohos.agp.components.Button;                import ohos.agp.components.Text;                import ohos.agp.components.TextField;                                public class CalculatorView extends AbilitySlice {                    private TextField num1Field;                    private TextField num2Field;                    private Button addButton;                    private Button subtractButton;                    private Text resultText;                                    @Override                    public void onStart(ohos.aafwk.content.Intent intent) {                        super.onStart(intent);                        super.setUIContent(ResourceTable.Layout_ability_calculator);                                        num1Field = (TextField) findComponentById(ResourceTable.Id_num1_field);                        num2Field = (TextField) findComponentById(ResourceTable.Id_num2_field);                        addButton = (Button) findComponentById(ResourceTable.Id_add_button);                        subtractButton = (Button) findComponentById(ResourceTable.Id_subtract_button);                        resultText = (Text) findComponentById(ResourceTable.Id_result_text);                    }                                    public String getNum1() {                        return num1Field.getText();                    }                                    public String getNum2() {                        return num2Field.getText();                    }                                    public void setResult(String result) {                        resultText.setText(result);                    }                                    public void setAddButtonClickListener(ohos.agp.components.Component.ClickedListener listener) {                        addButton.setClickedListener(listener);                    }                                    public void setSubtractButtonClickListener(ohos.agp.components.Component.ClickedListener listener) {                        subtractButton.setClickedListener(listener);                    }                }                                // 控制器层：处理用户输入和调用模型                public class CalculatorController {                    private CalculatorModel model;                    private CalculatorView view;                                    public CalculatorController(CalculatorModel model, CalculatorView view) {                        this.model = model;                        this.view = view;                                        view.setAddButtonClickListener(new ohos.agp.components.Component.ClickedListener() {                            @Override                            public void onClick(ohos.agp.components.Component component) {                                int num1 = Integer.parseInt(view.getNum1());                                int num2 = Integer.parseInt(view.getNum2());                                int result = model.add(num1, num2);                                view.setResult(String.valueOf(result));                            }                        });                                        view.setSubtractButtonClickListener(new ohos.agp.components.Component.ClickedListener() {                            @Override                            public void onClick(ohos.agp.components.Component component) {                                int num1 = Integer.parseInt(view.getNum1());                                int num2 = Integer.parseInt(view.getNum2());                                int result = model.subtract(num1, num2);                                view.setResult(String.valueOf(result));                            }                        });                    }                }                
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// 模型层：数据类                import ohos.data.orm.OrmContext;                import ohos.data.rdb.RdbStore;                import ohos.data.rdb.StoreConfig;                                 class Item {                    private String name;                                     public Item(String name) {                        this.name = name;                    }                                     public String getName() {                        return name;                    }                                     public void setName(String name) {                        this.name = name;                    }                }                                 // ViewModel层：处理业务逻辑和数据转换                import ohos.event.notification.NotificationHelper;                import ohos.event.notification.NotificationRequest;                import ohos.miscservices.pasteboard.PasteData;                import ohos.miscservices.pasteboard.Pasteboard;                import ohos.miscservices.pasteboard.SystemPasteboard;                import ohos.rpc.RemoteException;                import java.util.ArrayList;                import java.util.List;                                 class ItemViewModel {                    private List<Item> itemList;                                     public ItemViewModel() {                        itemList = new ArrayList<>();                        itemList.add(new Item("Item 1"));                        itemList.add(new Item("Item 2"));                        itemList.add(new Item("Item 3"));                    }                                     public List<Item> getItemList() {                        return itemList;                    }                }                                 // 视图层：展示界面                import ohos.aafwk.ability.AbilitySlice;                import ohos.agp.components.Component;                import ohos.agp.components.DirectionalLayout;                import ohos.agp.components.Text;                import java.util.List;                                 public class ItemView extends AbilitySlice {                    private DirectionalLayout itemLayout;                    private ItemViewModel viewModel;                                     @Override                    public void onStart(ohos.aafwk.content.Intent intent) {                        super.onStart(intent);                        super.setUIContent(ResourceTable.Layout_ability_item);                                         itemLayout = (DirectionalLayout) findComponentById(ResourceTable.Id_item_layout);                        viewModel = new ItemViewModel();                                         showItems();                    }                                     private void showItems() {                        List<Item> itemList = viewModel.getItemList();                        for (Item item : itemList) {                            Text text = new Text(getContext());                            text.setText(item.getName());                            itemLayout.addComponent(text);                        }                    }                }
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