包括小部件内url的内容

编程问答 2022-08-10

问题描述

我想获取调用URL的已解析json值的内容

style.map("myButton.TButton",background=[('active','green')])

如您所见，我可以从json获取URL并使用它

import 'dart:async';
import 'dart:convert';
import 'package:Flutter/foundation.dart';
import 'package:Flutter/material.dart';
import 'package:http/http.dart' as http;
Future<List<Photo>> fetchPhotos(http.Client client) async {
  final response =
  await client.get('https://pastebin.com/raw/RfNvKVPp');
  return compute(parsePhotos,response.body);
}
List<Photo> parsePhotos(String responseBody) {
  final parsed = jsonDecode(responseBody)['body'][0]['children'] as List;
  return parsed.map<Photo>((json) => Photo.fromJson(json)).toList();
}
class Photo {
  final String URL;
  final String text;
  Photo({this.URL,this.text});
  factory Photo.fromJson(Map<String,dynamic> json) {
    return Photo(
      text: json['text'] as String,URL: json['URL'] as String,);
  }
}
void main() {

  runApp(MyApp());}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final appTitle = 'Isolate Demo';
    return MaterialApp(
      title: appTitle,home: MyHomePage(title: appTitle),);
  }
}
class MyHomePage extends StatefulWidget {
  final String title;
  MyHomePage({Key key,this.title}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

  @override
  void initState() {

    super.initState();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),),body: FutureBuilder<List<Photo>>(
        future: fetchPhotos(http.Client()),builder: (context,snapshot) {
          if (snapshot.hasError) print(snapshot.error);
          return snapshot.hasData
              ? PhotosList(photos: snapshot.data)
              : Center(child: CircularProgressIndicator());
        },);
  }
}
class PhotosList extends StatelessWidget {
  final List<Photo> photos;
  PhotosList({Key key,this.photos}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: photos.length,itemBuilder: (context,index) {
        return ListTile(
          title:Text(photos[index].URL,style: TextStyle(color: Colors.blueGrey,fontSize: 14),subtitle:Text(photos[index].text,style: TextStyle(color: Colors.red,leading: Icon(Icons.threed_rotation,color: Colors.pink,);
      },);
  }
}

但是我想要的是获取内部文件的内容

title:Text(photos[index].URL,

我们可以通过读取响应引发http或通过使用httpclient直接获取内容来实现。

http 

photos[index].URL

httpclient 

 Future<String> _initFuture(String url) async {
var resp = await http.get(url);
return resp.body;
  }

所以问题是我不知道如何在代码中调用ip函数或_initFuture函数

获取网址的内容

  Future<String> ip(String url)
  async {
    HttpClient client = new HttpClient();
    var request = await client.postUrl(Uri.parse(url));
    var response = await request.close(); 
    return response.single.then(utf8.decode);
  }

代替网址

title:Text(here i need the response or the content of the url not the url itself,

预先感谢

解决方法

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darthttphttphttpclienthttpclientresponse