آموزش Dio و Retrofit در فلاتر

dependencies:
  flutter:
    sdk: flutter
  dio: ^5.4.0
  retrofit: ^4.0.3
  json_annotation: ^4.8.1
  logger: ^2.0.2+1
  flutter_bloc: ^8.1.3
  equatable: ^2.0.5
  freezed_annotation: ^2.2.0
  build_runner: ^2.3.3
  retrofit_generator: ^8.0.2

flutter pub get

import 'package:json_annotation/json_annotation.dart';

part 'user_model.g.dart';

@JsonSerializable()
class UserModel {
  final int id;
  final String name;
  final String email;

  UserModel({required this.id, required this.name, required this.email});

  factory UserModel.fromJson(Map<String, dynamic> json) => _$UserModelFromJson(json);

  Map<String, dynamic> toJson() => _$UserModelToJson(this);
}

flutter pub run build_runner build --delete-conflicting-outputs

import 'package:dio/dio.dart';
import 'package:retrofit/http.dart';
import '../models/user_model.dart';

part 'api_service.g.dart';

@RestApi(baseUrl: "https://jsonplaceholder.typicode.com")
abstract class ApiService {
  factory ApiService(Dio dio, {String baseUrl}) = _ApiService;

  @GET("/users")
  Future<List<UserModel>> getUsers();

  @POST("/users")
  Future<UserModel> createUser(@Body() UserModel user);

  @PUT("/users/{id}")
  Future<UserModel> updateUser(@Path("id") int id, @Body() UserModel user);

  @DELETE("/users/{id}")
  Future<void> deleteUser(@Path("id") int id);
}

flutter pub run build_runner build --delete-conflicting-outputs

import 'package:dio/dio.dart';
import '../api/api_service.dart';
import '../models/user_model.dart';

class UserRepository {
  final ApiService apiService;

  UserRepository({required this.apiService});

  Future<List<UserModel>> getUsers() async {
    return await apiService.getUsers();
  }

  Future<UserModel> createUser(UserModel user) async {
    return await apiService.createUser(user);
  }

  Future<UserModel> updateUser(int id, UserModel user) async {
    return await apiService.updateUser(id, user);
  }

  Future<void> deleteUser(int id) async {
    await apiService.deleteUser(id);
  }
}

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'api/api_service.dart';
import 'models/user_model.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({super.key});

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  late ApiService apiService;

  @override
  void initState() {
    super.initState();
    final dio = Dio();
    apiService = ApiService(dio);
  }

  Future<void> fetchUsers() async {
    List<UserModel> users = await apiService.getUsers();
    for (var user in users) {
      print('User: ${user.name}');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("Dio + Retrofit")),
      body: Center(
        child: ElevatedButton(
          onPressed: fetchUsers,
          child: const Text("Fetch Users"),
        ),
      ),
    );
  }
}