Error: The getter 'title' isn't defined for the type 'RSSParser' - flutter

Question

I wanted to implements a simple tutorial of how parsing an Rss Feed with Flutter, here is my code:
import 'package:flutter/material.dart';
import 'package:webfeed/webfeed.dart';
import 'package:http/http.dart' as http;
import 'package:url_launcher/url_launcher.dart';
import 'package:cached_network_image/cached_network_image.dart';
class RSSParser extends StatefulWidget {
#override
_RSSParserState createState() => _RSSParserState();
}
class _RSSParserState extends State<RSSParser> {
final String url = "https://www.90min.com/posts.rss";
RssFeed _feed;
String _title;
static const String loadingFeedMsg = 'Loading Feed...';
static const String feedLoadErrorMsg = 'Error Loading Feed.';
static const String feedOpenErrorMsg = 'Error Opening Feed.';
Future<RssFeed> loadFeed() async{
try{
final client = http.Client();
final response = await client.get(url);
return RssFeed.parse(response.body);
}
catch(e){
}
return null;
}
updateTitle(title){
setState(() {
_title = title;
});
}
#override
void initState() {
// TODO: implement initState
super.initState();
updateTitle(widget.title);
}
updateFeed(feed){
setState(() {
_feed = feed;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(_title),
),
);
}
}
The problem is that i got a compilation error in that instruction
updateTitle(widget.title);
with the following error message:
The getter 'title' isn't defined for the type 'RSSParser'
In the tutorial, it works fine!!
Do you have an idea how to solve this?
Thank you

Answer 1

You haven't declared title for you RSS widget. It should look something like ths:
class RSSParser extends StatefulWidget {
final String title;
const RSSParser({required this.title});
This should solve your error.

Answer 2

This is not working because there is not title in RSS class.
I think you are not clear with use of widget.something. It means that in the class which extends StatefulWidget there is a something parameter which i need to get in stateObject.
See the code to understand.
class YellowBird extends StatefulWidget {
const YellowBird({ Key? key }) : super(key: key);
String someData = 'SomeData'; // Some data
#override
_YellowBirdState createState() => _YellowBirdState();
}
//This is the state object
class _YellowBirdState extends State<YellowBird> {
// Now that if you need some data from the above class. You use use this widget.someData to get it here
String getHere = widget.someData ;
#override
Widget build(BuildContext context) {
return Container(color: const Color(0xFFFFE306));
}
}