我想创建一个新闻应用程序，并且已将newsapi.org用作源。

我正在尝试获取Http库提供的JSON数据。

我在下面提供了完整的代码。

它没有给我任何错误，但是没有加载任何数据，当我打印数据时，它可以打印所有内容，但是我无法显示。

我不是问题所在，但是我所有的项目都已停止解决此问题。

我正在寻找此代码的解决方案，因为它不起作用。

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart';
import 'package:newly/services/networking.dart';
import 'package:newly/widgets/article.dart';

class NewsScreen extends StatefulWidget {
  @override
  _NewsScreenState createState() => _NewsScreenState();
}

class _NewsScreenState extends State<NewsScreen> {

  List<Article> articles = [];

  NetworkHelper networkHelper = NetworkHelper(
    url:
        'https://newsapi.org/v2/everything?q=bitcoin&apiKey=392495172bab4b3885ae93760df54b91',);

  Future<List<Widget>> getNews() async {
    var newsData = await networkHelper.getData();

    for (int i = 0; i < await newsData['articles'].length; i++) {
      var title = await newsData['articles'][i]['title'];
      var urlToImage = await newsData['articles'][i]['urlToImage'];
      var content = await newsData['articles'][i]['content'];
      var author = await newsData['articles'][i]['author'];
      var url = await newsData['articles'][i]['url'];

      print(title);
      print(urlToImage);
      print(url);
      print(content);
      print(author);
      print('123456789123456789123456789123456789');

      articles.add(
        Article(
          author: author,content: content,title: title,url: url,urlToImage: urlToImage,),);

      print(articles[0].author);

    }

    return articles;
  }

  Future<List<Article>> showArticles() async {
    var data = await get(
      'https://newsapi.org/v2/everything?q=bitcoin&apiKey=392495172bab4b3885ae93760df54b91',);

    var dataDecoded = await json.decode(data.body);

    List<Article> articles = [];

    await dataDecoded.forEach(
      (article) {
        articles.add(
          Article(
            author: article['author'],content: article['content'],title: article['title'],url: article['url'],urlToImage: article['urlToImage'],);
      },);

    return articles;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.black,centerTitle: true,title: Text(
          'Newly',style: TextStyle(
            color: Colors.white,body: FutureBuilder(
        future: getNews(),builder: (context,snapshot) {
          return ListView(
            children: articles,);
        },);
  }
}

网络助手：

import 'package:http/http.dart' as http;
import 'dart:convert';

class NetworkHelper {
  NetworkHelper({this.url});

  final String url;

  Future getData() async {
    http.Response response = await http.get(url);

    if (response.statusCode == 200) {
      String data = response.body;

      return json.decode(data);
    } else {
      print('something wrong');
      print(response.statusCode);
    }
  }
}