0

lib/dao/car_dao.dart

@@ -0,0 +1,26 @@
+import 'package:flutter_provider_demo/model/car_model.dart';
+
+class CarDao {
+  /// get cars from sqlite
+  static Future<List<CarModel>> getCars() async {
+    return [
+      CarModel(id: 1, brand: "大众", type: "朗逸"),
+      CarModel(id: 2, brand: "大众", type: "帕萨特"),
+    ];
+  }
+
+  /// add car to sqlite
+  /// @param car
+  /// @return
+  /// @throws Exception
+  static Future<int> addCar(CarModel car) async {
+    return 0;
+  }
+
+  /// delete car from sqlite
+  /// @param car
+  /// @throws Exception
+  static Future<bool> deleteCar(CarModel car) {
+    return Future.value(true);
+  }
+}

lib/main.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_provider_demo/provider/car_provider.dart';
+import 'package:flutter_provider_demo/provider/theme_provider.dart';
 import 'package:flutter_provider_demo/routes.dart';
 import 'package:provider/provider.dart';
 
@@ -14,9 +16,8 @@ class MyApp extends StatelessWidget {
   Widget build(BuildContext context) {
     return MultiProvider(
       providers: [
-        // Provider<Counter>.value(value: Counter()),
-        ChangeNotifierProvider<Counter>(create: (_) => Counter()),
-        ChangeNotifierProvider<ThemeModel>(create: (_) => ThemeModel()),
+        ChangeNotifierProvider<CarProvider>(create: (_) => CarProvider()),
+        ChangeNotifierProvider<ThemeProvider>(create: (_) => ThemeProvider()),
       ],
       child: MaterialApp(
         title: 'Provider Demo',

lib/model/base_model.dart

@@ -3,8 +3,13 @@ class BaseModel {
 }
 
 class BaseEntity {
+  ///状态码 0：成功 其他异常
   int code = 0;
+
+  /// 提示信息
   String msg = "";
+
+  /// 数据
   BaseModel? data;
   BaseEntity({required this.code, required this.msg, this.data});
   BaseEntity.fromJson(Map<String, dynamic> json) {

lib/model/car_model.dart

@@ -0,0 +1,31 @@
+/// Description: car model
+/// Time       : 09/04/2023 Monday
+/// Author     : liuyuqi.gov@msn.cn
+class CarModel {
+  int id;
+  String brand;
+  String type;
+  bool start;
+
+  CarModel({
+    required this.id,
+    required this.brand,
+    required this.type,
+    this.start = false,
+  });
+
+  CarModel.fromJson(Map<String, dynamic> json)
+      : id = json['id'],
+        brand = json['brand'],
+        type = json['type'],
+        start = json['start'] == 1 ? true : false;
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'brand': brand,
+      'type': type,
+      'start': start == true ? 1 : 0,
+    };
+  }
+}

lib/model/entity_factory.dart

@@ -0,0 +1,13 @@
+import 'package:flutter_provider_demo/model/base_model.dart';
+import 'package:flutter_provider_demo/model/user_model.dart';
+
+class EntityFactory {
+  // 把api获得的 json 中的 data 字段于Model 绑定
+  static T generateOBJ<T>(dynamic json) {
+    if (T.toString() == "UserEntity") {
+      return UserEntity.fromJson(json) as T;
+    } else {
+      return BaseEntity(code: -1, msg: "No such Model") as T;
+    }
+  }
+}

lib/model/user_model.dart

@@ -1,8 +1,9 @@
+import 'package:flutter_provider_demo/model/base_model.dart';
+
 /// Description:
 /// Time       : 09/03/2023 Sunday
 /// Author     : liuyuqi.gov@msn.cn
-class UserModel {
-  int id = 0;
+class UserModel extends BaseModel {
   String name = "";
   int age = 18;
   String email = "";
@@ -14,7 +15,6 @@ class UserModel {
   String createdAt = "";
 
   UserModel({
-    required this.id,
     required this.name,
     required this.age,
     required this.email,
@@ -54,3 +54,18 @@ class UserModel {
     };
   }
 }
+
+class UserEntity extends BaseEntity {
+  UserEntity({required int code, required String msg, UserModel? data})
+      : super(code: code, msg: msg, data: data);
+
+  UserEntity.fromJson(Map<String, dynamic> json)
+      : super(
+          code: int.parse(json["code"]),
+          msg: json["msg"],
+        ) {
+    if (json['data'] != null) {
+      data = UserModel.fromJson(json['data']);
+    }
+  }
+}

lib/provider/car_provider.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_provider_demo/dao/car_dao.dart';
+import 'package:flutter_provider_demo/model/car_model.dart';
+
+/// Description: car provider
+/// Time       : 09/04/2023 Monday
+/// Author     : liuyuqi.gov@msn.cn
+class CarProvider extends ChangeNotifier {
+  late List<CarModel> _cars;
+  int _count = 0;
+
+  Future<List<CarModel>> getCars() async {
+    _cars = await CarDao.getCars();
+    notifyListeners();
+    return _cars;
+  }
+
+  void deleteCar(BuildContext context, CarModel car) async {
+    await CarDao.deleteCar(car);
+    _cars.remove(car);
+    notifyListeners();
+  }
+}

lib/provider/theme_provider.dart

@@ -1,3 +1,5 @@
+import 'package:flutter/material.dart';
+
 class ThemeProvider extends ChangeNotifier {
   
 }

lib/routes.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_provider_demo/index_page.dart';
 
 /// Description: routes
 /// Time       : 09/03/2023 Sunday
@@ -15,6 +16,11 @@ class Routes {
           builder: (_) => const Scaffold(),
           settings: settings,
         );
+      case index:
+        return MaterialPageRoute<dynamic>(
+          builder: (_) => const IndexPage(),
+          settings: settings,
+        );
       default:
         return MaterialPageRoute<dynamic>(
           builder: (_) => const Scaffold(),