Flutter: give Map to Routes option from other file - dart

Question

I'm a bit at loss here.
return MaterialApp(
title: 'App Title',
theme: ThemeData(brightness: Brightness.dark),
initialRoute: '/',
routes: SOMETHING_HERE,
);
I want to push SOMETHING_HERE from a different file, but I can't seem to push a correct value there.
Other file (attempt):
import '../screens/home.dart';
import '../screens/charts.dart';
class Routes {
factory Routes(context) {
Map<String, Widget Function(BuildContext)> _routes;
_routes = {
'/': (context) => ScreenHome(),
'/charts': (context) => ScreenCharts(),
};
return _routes;
}
}
This doesn't work cause it says:
The argument type 'Routes' can't be assigned to the parameter type 'Map<String, (BuildContext) → Widget>'
OF course I can just pass a Map to this argument but I want to define my routes in a separate file.
Any suggestions on how to accomplish this?

Answer 1

I just had the same problem and found the solution.
You don't need to create a class, just create a var that equals your routes Map
main.dart:
import 'package:flutter/material.dart';
import './custom_routes.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(brightness: Brightness.dark),
initialRoute: '/',
routes: customRoutes,
);
}
}
custom_routes.dart:
import 'package:flutter/material.dart';
import '../screens/home.dart';
import '../screens/charts.dart';
var customRoutes = <String, WidgetBuilder>{
'/': (context) => ScreenHome(),
'/charts': (context) => ScreenCharts(),
};

Answer 2

**
There is another way you can try if you wish
**
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return MaterialApp(
initialRoute: LoginScreen.id,
routes: route,
);
},
}
Create your route dart file. No need to create a class
var route = <String, WidgetBuilder>{
LoginScreen.id: (_) => const LoginScreen(),
// call the classes
Dashboard.id: (_) => const Dashboard(),
// with value
Dashboard.id: (_) => const Dashboard(value: ''),
};
If you don't use call by id. You can do that as well. Also you can pass values shown example

Answer 3

Just create any function with return of Map<String, WidgetBuilder>, here i will show how to do that with pass data to your routes class:
1- Create new file routes.dart, this full code (i used my custom variables like serverToken, notifierThemeMode) to fully explain the process:
import 'package:rxdart/rxdart.dart';
import 'package:flutter/material.dart';
import 'package:path/to/home_screen.dart';
import 'package:path/to/login_screen.dart';
class AppRoutes{
// get initial route
static getInitialRoute({String? serverToken}){
return serverToken == null
? LoginScreen.routeName
: HomeScreen.routeName;
}
// get all app routes
static Map<String, WidgetBuilder> getRoutes({
required BehaviorSubject<ThemeMode?> notifierThemeMode,
required BehaviorSubject<Locale?> notifierLocale,
}){
return {
HomeScreen.routeName: (BuildContext context) => HomeScreen(
notifierThemeMode: notifierThemeMode,
),
LoginScreen.routeName: (BuildContext context) => LoginScreen(
notifierLocale: notifierLocale,
),
}
}
2- In MaterialApp widget call the previous functions:
MaterialApp(
...
routes: AppRoutes.getRoutes(
notifierThemeMode: _notifierThemeMode,
notifierLocale: _notifierLocale
),
initialRoute: AppRoutes.getInitialRoute(
serverToken: _appServerToken
),
);