flutter:安装使用第三方库：以dio为例(flutter 3.7.0 / dio 4.0.6)

一，dio库的地址:

国外:

https://pub.dev/packages/dio

国内:

https://pub.flutter-io.cn/packages/dio

如图：可以看到最新版本是4.0.6

说明：刘宏缔的架构森林是一个专注架构的博客，

网站：https://blog.imgtouch.com
原文: https://blog.imgtouch.com/index.php/2023/06/04/flutter-an-zhuang-shi-yong-di-san-fang-ku-yi-dio-wei-li/

         对应的源码可以访问这里获取： https://github.com/liuhongdi/
         或: https://gitee.com/liuhongdi

说明：作者:刘宏缔 邮箱: 371125307@qq.com

二，在项目中添加dio

1，修改:  pubspec.yaml

添加dio,如图:

2,下载：

点击 Pub get 按钮

如图:

更新后pubspec.lock中会记录有dio的详累信息，如图:

三，在项目中实际应用dio

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';
import 'dart:convert';
import 'dart:io';

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

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

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  //int _counter = 0;
  String _title = "标题";
  String _author = "作者";
  String _content = "静夜思";

  void setContent(String content,title,author) {
    setState(() {
      _content = content;
      _title = title;
      _author = author;
    });
  }

  void getHttp() async {
    String url = 'http://www.lhdtest.com/item/one?id=1';
    try {
      var response = await Dio().get(url);
      print(response);

      if (response.statusCode == HttpStatus.ok) {
        var data= jsonDecode(response.toString());
        print(data);
        setContent(data['data']['content'],data['data']['title'],data['data']['author']);
      }
    } catch (e) {
      print(e);
    }
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[

            ElevatedButton(
              onPressed: (){
                print("按钮被点击了：");
                getHttp();
              },
              child: Text(
                '获取远程数据',
                style: TextStyle(
                  color: Colors.white,
                ),
              ),
            ),

            Text(
              '$_title',
            ),
            Text(
              '$_author',
            ),

            Text(
              '$_content',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
    );
  }
}

四，运行测试效果

五，查看flutter的版本:

liuhongdi@liuhongdideMBP ~ % flutter --version
Flutter 3.7.0 • channel stable • https://github.com/flutter/flutter.git
Framework • revision b06b8b2710 (7 days ago) • 2023-01-23 16:55:55 -0800
Engine • revision b24591ed32
Tools • Dart 2.19.0 • DevTools 2.20.1