flutter 进行网络请求

本片博客进行基本网络的请求，

了解更多

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源码：

import 'package:flutter/material.dart';
import 'package:flutter_shop/index_page_test/index_page.dart';

///能套一个方便的组件的话，就套一个，方便以后修改
void main() => runApp(MyApp());

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

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

///实现简单从网络获取数据并在页面进行显示
import 'package:flutter/material.dart';
import 'package:dio/dio.dart';

class IndexPage extends StatefulWidget {
  IndexPage({Key key}) : super(key: key);

  _IndexPageState createState() => _IndexPageState();
}

class _IndexPageState extends State {

  TextEditingController questionController;
  String responseText;

  @override
  void initState() { 
    super.initState();
    questionController = TextEditingController();
    responseText = '';
  }

  @override
  void dispose() { 
    questionController.dispose();
    super.dispose();
  }

  _showDialog() async{
    if(questionController.text.toString() != null){
      
      getHttp().then((val){
        setState(() {
          responseText = val;
        });
      });
     
    }else{
      showDialog(
        context: context,
        builder: (val)=> AlertDialog(title: Text('内容不能为空'),),
      );
    }
  }

  Future getHttp() async{
    Response response;
    response = await Dio().get('http://www.baidu.com',
      queryParameters: {
        'jik':'nkj',
      });
    return response.data;
  }

  @override
  Widget build(BuildContext context) {

      Widget body = Container(
      padding: EdgeInsets.symmetric(vertical: 10),
      child: Column(
        children: [
          TextField(
            controller: questionController,
            autofocus: false,
            decoration: InputDecoration(
              labelText: '问题',
              helperText: '请输入您的要搜索的内容',
            ),
          ),
          RaisedButton(
            child: Text('搜索'),
            onPressed: _showDialog,
          ),
          Text(
            responseText,
            textAlign: TextAlign.center,
            maxLines: 10,
            overflow: TextOverflow.ellipsis,
          )
        ],
      ),
    );

    return Scaffold(
      appBar: AppBar(title: Text('我的“搜索”'),),
      body: body,
    );
  }
}

运用 Dio 开发，使用 Get 方法，Future 返回值

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也可以使用 Post 方法