You can copy paste run full code below
You can use package https://pub.dev/packages/xml2json and parse to related Payload class , you can see class definition in full code
code snippet
http.Response response = await http.get("http://www.rssmix.com/u/11631847/rss.xml"); if (response.statusCode == 200) { xml2json.parse(response.body); String jsonData = xml2json.toGData(); Payload payload = payloadFromJson(jsonData); print(payload.rss.channel.item[0].mediaContent[1]["url"]); for (int i = 0; i < payload.rss.channel.item.length; i++) { var mediaContent = payload.rss.channel.item[i].mediaContent; if (mediaContent != null && mediaContent.length >= 2) { var mediaContentItem1 = payload.rss.channel.item[i].mediaContent[1]; if (mediaContentItem1!= null && mediaContentItem1.containsKey("url")) { var url = mediaContentItem1["url"]; if (url != null) { print(url); } } } } }output
I/flutter (27743): https://chrcph.files.wordpress.com/2020/05/tuborg-classic.jpg?w=566I/flutter (27743): https://chrcph.files.wordpress.com/2020/05/tuborg-classic.jpg?w=566I/flutter (27743): https://ousensoel.files.wordpress.com/2020/05/img_20200506_095714_846.jpg?w=1024I/flutter (27743): https://chrcph.files.wordpress.com/2020/04/45-days-extra-natural-octo.jpg?w=1024I/flutter (27743): https://chrcph.files.wordpress.com/2020/04/paulanersalvator.jpg?w=300I/flutter (27743): https://chrcph.files.wordpress.com/2020/04/pc3a5skebryg-herslev.jpg?w=640I/flutter (27743): https://chrcph.files.wordpress.com/2020/03/gb_witbier.png?w=800I/flutter (27743): https://2.gravatar.com/avatar/80b9081c0062489b95364a72652cd533?s=96&d=identicon&r=GI/flutter (27743): https://2.gravatar.com/avatar/80b9081c0062489b95364a72652cd533?s=96&d=identicon&r=GI/flutter (27743): https://ousensoel.files.wordpress.com/2020/02/img_20200103_162444_232.jpg?w=1024I/flutter (27743): https://chrcph.files.wordpress.com/2020/02/interic3b8r-the-phil-.jpg?w=550I/flutter (27743): https://chrcph.files.wordpress.com/2020/01/mikkeller-weird-weather.jpg?w=683I/flutter (27743): https://chrcph.files.wordpress.com/2020/01/chai-de-lermitage-.jpg?w=1000I/flutter (27743): https://chrcph.files.wordpress.com/2020/01/dab-frisch-vom-fass.jpg?w=474I/flutter (27743): https://2.gravatar.com/avatar/80b9081c0062489b95364a72652cd533?s=96&d=identicon&r=GI/flutter (27743): https://2.gravatar.com/avatar/80b9081c0062489b95364a72652cd533?s=96&d=identicon&r=GI/flutter (27743): https://chrcph.files.wordpress.com/2019/12/foerster-udenfor.jpg?w=1000full code
import 'package:flutter/material.dart';import 'package:xml2json/xml2json.dart';import 'dart:convert';import 'package:http/http.dart' as http;Payload payloadFromJson(String str) => Payload.fromJson(json.decode(str));String payloadToJson(Payload data) => json.encode(data.toJson());class Payload { String version; String encoding; Rss rss; Payload({ this.version, this.encoding, this.rss, }); factory Payload.fromJson(Map<String, dynamic> json) => Payload( version: json["version"], encoding: json["encoding"], rss: Rss.fromJson(json["rss"]), ); Map<String, dynamic> toJson() => {"version": version,"encoding": encoding,"rss": rss.toJson(), };}class Rss { String version; List<Xmln> xmlns; String xmlnsContent; String xmlnsDc; Channel channel; Rss({ this.version, this.xmlns, this.xmlnsContent, this.xmlnsDc, this.channel, }); factory Rss.fromJson(Map<String, dynamic> json) => Rss( version: json["version"], xmlns: List<Xmln>.from(json["xmlns"].map((x) => Xmln.fromJson(x))), xmlnsContent: json["xmlns\u0024content"], xmlnsDc: json["xmlns\u0024dc"], channel: Channel.fromJson(json["channel"]), ); Map<String, dynamic> toJson() => {"version": version,"xmlns": List<dynamic>.from(xmlns.map((x) => x.toJson())),"xmlns\u0024content": xmlnsContent,"xmlns\u0024dc": xmlnsDc,"channel": channel.toJson(), };}class Channel { Description title; Description link; Description description; Description generator; List<Item> item; Channel({ this.title, this.link, this.description, this.generator, this.item, }); factory Channel.fromJson(Map<String, dynamic> json) => Channel( title: Description.fromJson(json["title"]), link: Description.fromJson(json["link"]), description: Description.fromJson(json["description"]), generator: Description.fromJson(json["generator"]), item: List<Item>.from(json["item"].map((x) => Item.fromJson(x))), ); Map<String, dynamic> toJson() => {"title": title.toJson(),"link": link.toJson(),"description": description.toJson(),"generator": generator.toJson(),"item": List<dynamic>.from(item.map((x) => x.toJson())), };}class Description { String t; Description({ this.t, }); factory Description.fromJson(Map<String, dynamic> json) => Description( t: json["\u0024t"], ); Map<String, dynamic> toJson() => {"\u0024t": t, };}class Item { Description title; Description link; WfwCommentRss wfwCommentRss; SlashComments slashComments; dynamic mediaContent; Description description; Description contentEncoded; dynamic category; Description pubDate; Description comments; Guid guid; Description dcCreator; Description dcDate; PostId postId; MediaThumbnail mediaThumbnail; Item({ this.title, this.link, this.wfwCommentRss, this.slashComments, this.mediaContent, this.description, this.contentEncoded, this.category, this.pubDate, this.comments, this.guid, this.dcCreator, this.dcDate, this.postId, this.mediaThumbnail, }); factory Item.fromJson(Map<String, dynamic> json) => Item( title: Description.fromJson(json["title"]), link: Description.fromJson(json["link"]), wfwCommentRss: json["wfw\u0024commentRss"] == null ? null : WfwCommentRss.fromJson(json["wfw\u0024commentRss"]), slashComments: json["slash\u0024comments"] == null ? null : SlashComments.fromJson(json["slash\u0024comments"]), mediaContent: json["media\u0024content"], description: Description.fromJson(json["description"]), contentEncoded: json["content\u0024encoded"] == null ? null : Description.fromJson(json["content\u0024encoded"]), category: json["category"], pubDate: Description.fromJson(json["pubDate"]), comments: json["comments"] == null ? null : Description.fromJson(json["comments"]), guid: Guid.fromJson(json["guid"]), dcCreator: Description.fromJson(json["dc\u0024creator"]), dcDate: Description.fromJson(json["dc\u0024date"]), postId: json["post-id"] == null ? null : PostId.fromJson(json["post-id"]), mediaThumbnail: json["media\u0024thumbnail"] == null ? null : MediaThumbnail.fromJson(json["media\u0024thumbnail"]), ); Map<String, dynamic> toJson() => {"title": title.toJson(),"link": link.toJson(),"wfw\u0024commentRss": wfwCommentRss == null ? null : wfwCommentRss.toJson(),"slash\u0024comments": slashComments == null ? null : slashComments.toJson(),"media\u0024content": mediaContent,"description": description.toJson(),"content\u0024encoded": contentEncoded == null ? null : contentEncoded.toJson(),"category": category,"pubDate": pubDate.toJson(),"comments": comments == null ? null : comments.toJson(),"guid": guid.toJson(),"dc\u0024creator": dcCreator.toJson(),"dc\u0024date": dcDate.toJson(),"post-id": postId == null ? null : postId.toJson(),"media\u0024thumbnail": mediaThumbnail == null ? null : mediaThumbnail.toJson(), };}class Guid { String isPermaLink; String t; Guid({ this.isPermaLink, this.t, }); factory Guid.fromJson(Map<String, dynamic> json) => Guid( isPermaLink: json["isPermaLink"], t: json["\u0024t"], ); Map<String, dynamic> toJson() => {"isPermaLink": isPermaLink,"\u0024t": t, };}class MediaContentElement { String url; Medium medium; List<Xmln> xmlns; String xmlnsMedia; MediaTitle mediaTitle; MediaContentElement({ this.url, this.medium, this.xmlns, this.xmlnsMedia, this.mediaTitle, }); factory MediaContentElement.fromJson(Map<String, dynamic> json) => MediaContentElement( url: json["url"], medium: mediumValues.map[json["medium"]], xmlns: List<Xmln>.from(json["xmlns"].map((x) => Xmln.fromJson(x))), xmlnsMedia: json["xmlns\u0024media"], mediaTitle: json["media\u0024title"] == null ? null : MediaTitle.fromJson(json["media\u0024title"]), ); Map<String, dynamic> toJson() => {"url": url,"medium": mediumValues.reverse[medium],"xmlns": List<dynamic>.from(xmlns.map((x) => x.toJson())),"xmlns\u0024media": xmlnsMedia,"media\u0024title": mediaTitle == null ? null : mediaTitle.toJson(), };}class MediaTitle { Type type; String t; MediaTitle({ this.type, this.t, }); factory MediaTitle.fromJson(Map<String, dynamic> json) => MediaTitle( type: typeValues.map[json["type"]], t: json["\u0024t"], ); Map<String, dynamic> toJson() => {"type": typeValues.reverse[type],"\u0024t": t, };}enum Type { HTML }final typeValues = EnumValues({"html": Type.HTML});enum Medium { IMAGE }final mediumValues = EnumValues({"image": Medium.IMAGE});class Xmln { Xmln(); factory Xmln.fromJson(Map<String, dynamic> json) => Xmln(); Map<String, dynamic> toJson() => {};}class MediaThumbnail { String url; List<Xmln> xmlns; String xmlnsMedia; MediaThumbnail({ this.url, this.xmlns, this.xmlnsMedia, }); factory MediaThumbnail.fromJson(Map<String, dynamic> json) => MediaThumbnail( url: json["url"], xmlns: List<Xmln>.from(json["xmlns"].map((x) => Xmln.fromJson(x))), xmlnsMedia: json["xmlns\u0024media"], ); Map<String, dynamic> toJson() => {"url": url,"xmlns": List<dynamic>.from(xmlns.map((x) => x.toJson())),"xmlns\u0024media": xmlnsMedia, };}class PostId { Xmlns xmlns; String t; PostId({ this.xmlns, this.t, }); factory PostId.fromJson(Map<String, dynamic> json) => PostId( xmlns: xmlnsValues.map[json["xmlns"]], t: json["\u0024t"], ); Map<String, dynamic> toJson() => {"xmlns": xmlnsValues.reverse[xmlns],"\u0024t": t, };}enum Xmlns { COM_WORDPRESS_FEED_ADDITIONS_1 }final xmlnsValues = EnumValues( {"com-wordpress:feed-additions:1": Xmlns.COM_WORDPRESS_FEED_ADDITIONS_1});class SlashComments { List<Xmln> xmlns; String xmlnsSlash; String t; SlashComments({ this.xmlns, this.xmlnsSlash, this.t, }); factory SlashComments.fromJson(Map<String, dynamic> json) => SlashComments( xmlns: List<Xmln>.from(json["xmlns"].map((x) => Xmln.fromJson(x))), xmlnsSlash: json["xmlns\u0024slash"], t: json["\u0024t"], ); Map<String, dynamic> toJson() => {"xmlns": List<dynamic>.from(xmlns.map((x) => x.toJson())),"xmlns\u0024slash": xmlnsSlash,"\u0024t": t, };}class WfwCommentRss { List<Xmln> xmlns; String xmlnsWfw; String t; WfwCommentRss({ this.xmlns, this.xmlnsWfw, this.t, }); factory WfwCommentRss.fromJson(Map<String, dynamic> json) => WfwCommentRss( xmlns: List<Xmln>.from(json["xmlns"].map((x) => Xmln.fromJson(x))), xmlnsWfw: json["xmlns\u0024wfw"], t: json["\u0024t"], ); Map<String, dynamic> toJson() => {"xmlns": List<dynamic>.from(xmlns.map((x) => x.toJson())),"xmlns\u0024wfw": xmlnsWfw,"\u0024t": t, };}class EnumValues<T> { Map<String, T> map; Map<T, String> reverseMap; EnumValues(this.map); Map<T, String> get reverse { if (reverseMap == null) { reverseMap = map.map((k, v) => new MapEntry(v, k)); } return reverseMap; }}void main() { runApp(MyApp());}class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.blue, visualDensity: VisualDensity.adaptivePlatformDensity, ), home: MyHomePage(title: 'Flutter Demo Home Page'), ); }}class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String title; @override _MyHomePageState createState() => _MyHomePageState();}class _MyHomePageState extends State<MyHomePage> { int _counter = 0; Xml2Json xml2json = Xml2Json(); void _incrementCounter() async { http.Response response = await http.get("http://www.rssmix.com/u/11631847/rss.xml"); if (response.statusCode == 200) { xml2json.parse(response.body); String jsonData = xml2json.toGData(); Payload payload = payloadFromJson(jsonData); print(payload.rss.channel.item[0].mediaContent[1]["url"]); for (int i = 0; i < payload.rss.channel.item.length; i++) { var mediaContent = payload.rss.channel.item[i].mediaContent; if (mediaContent != null && mediaContent.length >= 2) { var mediaContentItem1 = payload.rss.channel.item[i].mediaContent[1]; if (mediaContentItem1!= null && mediaContentItem1.containsKey("url")) { var url = mediaContentItem1["url"]; if (url != null) { print(url); } } } } } setState(() { _counter++; }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(widget.title), ), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text('You have pushed the button this many times:', ), Text('$_counter', style: Theme.of(context).textTheme.headline4, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: Icon(Icons.add), ), ); }}