How to parse RSS Feed in Flutter?

dependencies:
  flutter:
    sdk: flutter
  webfeed: ^0.4.2
  https: ^0.12.1

class NewsModel {
  final String title;
  final String description;

  NewsModel({this.title, this.description});
}

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:webfeed/domain/rss_feed.dart';

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

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

class MyApp extends StatelessWidget {
  static String rssUrl = 'https://feeds.bbci.co.uk/news/rss.xml';
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,

        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: Scaffold(
        body: Container(

          child: FutureBuilder(
            future: fetchNews(),
            builder: (context, snap) {
              if (snap.hasData) {
                final List _news = snap.data;
                return ListView.separated(
                  itemBuilder: (context, i) {
                    final NewsModel _item = _news[i];
                    return ListTile(
                      title: Text('${_item.title}'),
                      subtitle: Text(
                        '${_item.description}',
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                    );
                  },
                  separatorBuilder: (context, i) => Divider(),
                  itemCount: _news.length,
                );
              } else if (snap.hasError) {
                return Center(
                  child: Text(snap.error.toString()),
                );
              } else {
                return Center(
                  child: CircularProgressIndicator(),
                );
              }
            },
          ),
        ),
      ),
    );
  }
  Future> fetchNews() async {
    final _response = await http.get(rssUrl);

    if (_response.statusCode == 200) {
      var _decoded = new RssFeed.parse(_response.body);
      return _decoded.items
          .map((item) => NewsModel(
        title: item.title,
        description: item.description,
      ))
          .toList();
    } else {
      throw HttpException('Failed to fetch the data');
    }
  }
}