How do I fix my problem with routes in Flutter? - flutter

Question

good evening. I am currently doing a To-do List in Flutter and I want to pass the Title of my List and the Description of my List when I click on a new screen but upon setting up Routes and and declaring the values on my next, it shows the "2 positional arguments expected, but 0 found" on the routes I've set up. Here are my codes:
Here is my 1st screen:
import 'package:flutter/material.dart';
import 'package:todo_list/details.dart';
import 'package:todo_list/note.dart';
class MyApp extends StatelessWidget {
final String text;
final int number;
final String listDescription;
const MyApp(
{super.key,
required this.text,
required this.number,
required this.listDescription});
#override
Widget build(BuildContext context) {
return MaterialApp(
routes: {
DetailsPage.routeName: (ctx) => DetailsPage(),
},
home: CustomListTile(
text: text,
number: number,
listDescription: listDescription,
),
);
}
}
class CustomListTile extends StatelessWidget {
final String text;
final int number;
final String listDescription;
const CustomListTile(
{super.key,
required this.text,
required this.number,
required this.listDescription});
#override
Widget build(BuildContext context) {
return InkWell(
onTap: () {
Navigator.pushNamed(context, DetailsPage.routeName,
arguments: Note(title: text, description: listDescription));
},
/* onTap: () {
Widget okButton = TextButton(
child: const Text("CLOSE"),
onPressed: () {
Navigator.of(context).pop();
},
);
AlertDialog alert = AlertDialog(
title: Text(text),
content: Text('This item in the list contains $listDescription'),
actions: [
okButton,
]);
showDialog(
context: context,
builder: (BuildContext context) {
return alert;
});
}, */
child: Padding(
padding: const EdgeInsets.only(left: 20.0, right: 20.0, top: 20.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text("$number. $text",
style: const TextStyle(
fontSize: 20,
)),
const Icon(Icons.chevron_right)
],
),
Text(
listDescription,
style: const TextStyle(fontSize: 14, color: Colors.grey),
),
const Divider()
],
),
),
);
}
}
and here is my 2nd screen:
import 'package:flutter/material.dart';
import 'note.dart';
class DetailsPage extends StatefulWidget {
static const String routeName = "/details";
final String text;
final String listDescription;
const DetailsPage(this.text, this.listDescription, {super.key});
#override
State<DetailsPage> createState() => _DetailsPageState();
}
class _DetailsPageState extends State<DetailsPage> {
late Note params;
#override
void didChangeDependencies() {
params = ModalRoute.of(context)!.settings.arguments! as Note;
super.didChangeDependencies();
}
#override
Widget build(BuildContext context) {
Widget titleSection = Container(
padding: const EdgeInsets.all(32),
child: Row(
children: [
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Container(
padding: const EdgeInsets.only(bottom: 0),
child: Text(
params.title,
style: const TextStyle(
fontWeight: FontWeight.bold,
fontSize: 25,
),
),
),
],
),
),
],
),
);
Color color = Theme.of(context).primaryColor;
Widget buttonSection = Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
_buildButtonColumn(
color,
Icons.edit,
'EDIT',
),
_buildButtonColumn(color, Icons.delete, 'DELETE'),
],
);
Widget textSection = Padding(
padding: const EdgeInsets.all(20),
child: Text(
params.description,
softWrap: true,
),
);
return MaterialApp(
title: 'Layout for a New Screen',
theme: ThemeData(
primarySwatch: Colors.brown,
),
home: Scaffold(
appBar: AppBar(
leading: IconButton(
icon: const Icon(Icons.arrow_back),
onPressed: () {
Navigator.pop(context);
},
),
title: Text(params.title),
),
body: ListView(
children: [
Image.asset(
'lib/images/placeholder.jpg',
width: 600,
height: 240,
fit: BoxFit.cover,
),
titleSection,
buttonSection,
textSection,
],
),
),
);
}
Column _buildButtonColumn(
Color color,
IconData icon,
String label,
) {
return Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(icon, color: color),
Container(
margin: const EdgeInsets.only(top: 8),
child: Text(
label,
style: TextStyle(
fontSize: 12,
fontWeight: FontWeight.w400,
color: color,
),
),
),
],
);
}
}
/* return Scaffold(
appBar: AppBar(title: Text(text)),
body: Center(
child: Row(
children: [Text(description)],
),
));
}
} */
How do I make it so that the data I'll pass such as the Title and the Description will appear on the 2nd screen without the error "2 positional argument(s) expected, but 0 found.
Try adding the missing arguments." appearing.
I tried the Quick Fixes on VS Code such as adding a const modifier but I think the const modifier wouldn't do a fix since both data I'm trying to pass are dynamic and may change from time to time.

Answer 1

As you've define details page
class DetailsPage extends StatefulWidget {
static const String routeName = "/details";
final String text;
final String listDescription;
const DetailsPage(this.text, this.listDescription, {super.key});
You need to pass two string as positional argument.
So it can be
routes: {
DetailsPage.routeName: (ctx) => DetailsPage("text","description"),
},
also while you are using route arguments, you can remove theses from widget class and just accept from state class context with ModalRoute.
You can check this example and development/ui/navigation .