I want to show an overlay on the whole app so I tried to insert an overlay entry on the context of MaterialApp (root widget) but the problem is I'm getting the null value on invoking the following method :
Overlay.of(context);
GetMaterialApp.router(
debugShowCheckedModeBanner: false,
theme: AppTheme.lightTheme,
scaffoldMessengerKey: Keys.scaffold,
scrollBehavior: MyCustomScrollBehavior(),
routeInformationParser: WebRoutes.goRouter.routeInformationParser,
routerDelegate: WebRoutes.goRouter.routerDelegate,
routeInformationProvider: WebRoutes.goRouter.routeInformationProvider,
builder: (context, child) {
WidgetsBinding.instance.addPostFrameCallback((_){
addOverlay(context);
});
return child;
}
void addOverlay(BuildContext context) {
print(Overlay.of(context));
return Overlay.of(context)?.insert(OverlayEntry(
builder: (context) {
return SomeWidget();
},
));
}
Is there any way to get the state of overlay using the context of this root widget as I want to show the overlay globally.
Thanks alot, I really appreciate that If someone helps me.
MaterialApp(
navigatorKey: getIt.get<NavigatorService>().navigatorKey,
theme: AppTheme.defaultTheme,
initialRoute: AppRoutes.splashScreen,
builder: (context, child) {
return Scaffold(
body: Stack(
children: [
child!,
Positioned(
top: 15,
child: Container(
color: Colors.red,
height: 50,
width: MediaQuery.of(context).size.width,
child: const Center(child: Text("HI I AM AN OVERLAY")),
),
),
],
),
);
},
onGenerateRoute: AppRoutes.onGenerateRoute,
),
You can achieve that by create a class responsible to display/remove the overlay, this class need receive a BuildContext when creating to be able to create an instance of Overlay.
Basically what you need to do are:
Create a class OverlayScreen that build the OverlayState && OverlayEntry (in this case the OverylayEntry will be a list of OverlayEntry since we might have more than one Overlay on the screen so we can remove all of them at once).
Create an instance of this class earlier in your app (e.g MyApp). In your case you'll need to call this inside Material.router...builder param.
Access this overlayScreen in your HomePage to display|removeAll overlays
Lets create our OverlayScreen
import 'package:flutter/material.dart';
class OverlayScreen {
/// Create an Overlay on the screen
/// Declared [overlayEntrys] as List<OverlayEntry> because we might have
/// more than one Overlay on the screen, so we keep it on a list and remove all at once
BuildContext _context;
OverlayState? overlayState;
List<OverlayEntry>? overlayEntrys;
void closeAll() {
for (final overlay in overlayEntrys ?? <OverlayEntry>[]) {
overlay.remove();
}
overlayEntrys?.clear();
}
void show() {
overlayEntrys?.add(
OverlayEntry(
builder: (context) {
return _buildOverlayWidget();
},
),
);
overlayState?.insert(overlayEntrys!.last);
}
OverlayScreen._create(this._context) {
overlayState = Overlay.of(_context);
overlayEntrys = [];
}
factory OverlayScreen.of(BuildContext context) {
return OverlayScreen._create(context);
}
Widget _buildOverlayWidget() {
return Positioned(
top: 20,
left: 20,
right: 20,
child: Container(
width: 300,
color: Colors.black,
height: 300,
child: const Text("MY CHAT"),
),
);
}
}
Now lets create an instance on MyApp
// Need to have it global to be able to access everywhere
OverlayScreen? overlayScreen;
void main() {
runApp(
const MyApp(),
);
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
#override
Widget build(BuildContext context) {
return MaterialApp(
home: const HomePage(),
builder: (context, child) {
return Overlay(
initialEntries: [
OverlayEntry(
builder: (context) {
// Create an instance of `OverlayScreen` to be accessed globally
overlayScreen = OverlayScreen.of(context);
return child ?? const SizedBox();
},
),
],
);
},
);
}
}
To finalise lets create our HomePage and access our overlayScreen there there
import 'package:flutter/material.dart';
import 'package:overlay_all_app/src/overlay_screen.dart';
class HomePage extends StatelessWidget {
const HomePage({super.key});
#override
Widget build(BuildContext context) {
// Create an instance of OverlayScreen
final overlayScreen = OverlayScreen.of(context);
return Scaffold(
appBar: AppBar(
title: const Text('Home'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
TextButton(
onPressed: () {
// display the overlay
overlayScreen.show();
},
child: const Text('Display Overlay'),
),
const SizedBox(height: 30),
TextButton(
onPressed: () {
// Call your next screen here
},
child: const Text('Go to next page'),
),
const SizedBox(height: 30),
TextButton(
onPressed: () {
// removed all overlays on the screen
overlayScreen.closeAll();
},
child: const Text('Close Overlay'),
),
],
),
),
);
}
}
That's it. You can use this class OverlayScreen to show/removeAll wherever you want.
I created a PR with sample code, check it out https://github.com/antonio-nicolau/flutter-working-with-overlay
import 'package:flutter/material.dart';
import 'package:get/get_navigation/src/root/get_material_app.dart';
import 'package:go_router/go_router.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
runApp(App2());
}
class App2 extends StatelessWidget {
App2({super.key});
final _router = GoRouter(
routes: [
GoRoute(
path: '/',
builder: (context, state) => const OverlayWrapper(),
),
],
);
#override
Widget build(BuildContext context) {
return GetMaterialApp.router(
routeInformationParser: _router.routeInformationParser,
routerDelegate: _router.routerDelegate,
routeInformationProvider: _router.routeInformationProvider,
);
}
}
class OverlayWrapper extends StatefulWidget {
const OverlayWrapper({Key? key}) : super(key: key);
#override
State<OverlayWrapper> createState() => _OverlayWrapperState();
}
class _OverlayWrapperState extends State<OverlayWrapper> {
#override
void initState() {
super.initState();
}
showOverLay() {
OverlayEntry overlayEntry = OverlayEntry(
builder: (context) => Container(
color: Colors.red,
child: const Text('data'),
),
);
Overlay.of(context).insert(overlayEntry);
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: ElevatedButton(
onPressed: () {
showOverLay();
},
child: const Text(
'ShowOverlay',
style: TextStyle(),
),
),
),
);
}
}
i have a book for flutter beginner programmer. At the first section it show me how to create splash screen, but the problem is that splash screen is doesn't show, just a blank black screen and after that the apps is showing.
This is my splash_screen.dart
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:wisata_yogya/main.dart';
void main() =>runApp(SplashScreen());
// ignore: use_key_in_widget_constructors
class SplashScreen extends StatelessWidget{
#override
Widget build(BuildContext context){
return MaterialApp(
home: _SplashScreenBody(),
);
}
}
class _SplashScreenBody extends StatefulWidget{
#override
State<StatefulWidget> createState(){
return _SplashScreenBodyState();
}
}
class _SplashScreenBodyState extends State<_SplashScreenBody>{
#override
Widget build(BuildContext context){
Future.delayed(const Duration(seconds: 3), (){
Navigator.pushAndRemoveUntil(context,
// ignore: prefer_const_constructors
MaterialPageRoute(builder: (context) => MyApp()), (Route route) => false);
});
return const Scaffold(
body: Center(
child: Image(
image: AssetImage("graphics/logo.png"),
height: 75,
width: 75,
)
)
);
}
}
And there's no error in the code.
Method 1
You can use animated_splash_screen its easy to use,
home: AnimatedSplashScreen(
splash: Scaffold(
body: Center(
child: Image.asset(
'assets/logo.png',
width: double.infinity,
height: double.infinity,
),
),
),
duration: 100,
nextScreen: Login(),
splashTransition: SplashTransition.fadeTransition,
backgroundColor: Colors.white,
Method 2
Or Use Timer for delay some seconds in the initState()
Timer(
Duration(seconds: 2),
() => Navigator.pushReplacement(context,
MaterialPageRoute(builder: (context) => HomePage())));
class _SplashState extends State<Splash> {
#override
void initState() {
super.initState();
Timer(Duration(seconds: 3),
()=>Navigator.pushReplacement(context,
MaterialPageRoute(builder:
(context) =>First()
)
)
);
}
return Scaffold(
body: SizedBox.expand(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Container(
child: Image.asset('Assets/Group.png'),
padding: const EdgeInsets.all(8.0),
height: 200,
width: 200,
),
CircularProgressIndicator(color: HexColor('#22178F'),),
],
),
),
);
Try to add timer in initState instead of what you doing something like this
void initState() {
super.initState();
Timer(Duration(seconds: 5),
()=>Navigator.pushReplacement(context,
MaterialPageRoute(builder:
(context) => HomeScreen()
)
)
);
}
I didn't find any example for constructor CupertinoFullscreenDialogTransition
https://api.flutter.dev/flutter/cupertino/CupertinoFullscreenDialogTransition-class.html
I tried to understand below code but I didn't get it.
CupertinoFullscreenDialogTransition({
Key key,
#required Animation<double> animation,
#required this.child,
}) : _positionAnimation = CurvedAnimation(
parent: animation,
curve: Curves.linearToEaseOut,
// The curve must be flipped so that the reverse animation doesn't play
// an ease-in curve, which iOS does not use.
reverseCurve: Curves.linearToEaseOut.flipped,
).drive(_kBottomUpTween),
super(key: key);
Here's a more complete example
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
static const String _title = 'AppBar tutorial';
#override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
brightness: Brightness.light,
primaryColor: Colors.blue[900],
appBarTheme: AppBarTheme(iconTheme: IconThemeData(color: Colors.white)),
),
title: _title,
home: CupertinoFullscreenDialogTransitionPage(),
);
}
}
//First Page
class CupertinoFullscreenDialogTransitionPage extends StatefulWidget {
#override
_CupertinoFullscreenDialogTransitionState createState() =>
_CupertinoFullscreenDialogTransitionState();
}
class _CupertinoFullscreenDialogTransitionState
extends State<CupertinoFullscreenDialogTransitionPage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: PreferredSize(
preferredSize: Size.fromHeight(60),
child: AppBar(
title: Text("Cupertino Screen Transition"),
centerTitle: true,
),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
CupertinoButton.filled(
child: Text("Next Page Cupertino Transition"),
onPressed: () => Navigator.of(context).push(
PageRouteBuilder(
opaque: false,
pageBuilder: (context, _, __) {
return FullDialogPage();
},
),
),
),
],
)),
);
}
}
//Second Page
class FullDialogPage extends StatefulWidget {
#override
_FullDialogPageState createState() => _FullDialogPageState();
}
class _FullDialogPageState extends State<FullDialogPage>
with TickerProviderStateMixin {
AnimationController _primary, _secondary;
Animation<double> _animationPrimary, _animationSecondary;
#override
void initState() {
//Primaty
_primary = AnimationController(vsync: this, duration: Duration(seconds: 1));
_animationPrimary = Tween<double>(begin: 0, end: 1)
.animate(CurvedAnimation(parent: _primary, curve: Curves.easeOut));
//Secondary
_secondary =
AnimationController(vsync: this, duration: Duration(seconds: 1));
_animationSecondary = Tween<double>(begin: 0, end: 1)
.animate(CurvedAnimation(parent: _secondary, curve: Curves.easeOut));
_primary.forward();
super.initState();
}
#override
void dispose() {
_primary.dispose();
_secondary.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return CupertinoFullscreenDialogTransition(
primaryRouteAnimation: _animationPrimary,
secondaryRouteAnimation: _animationSecondary,
linearTransition: false,
child: Scaffold(
appBar: AppBar(
backgroundColor: Colors.indigo[900],
title: Text("Testing"),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {
_primary.reverse();
Future.delayed(Duration(seconds: 1), () {
Navigator.of(context).pop();
});
},
),
),
),
);
}
}
I've made this simple example, I hope it helps you understand how to implement the CupertinoFullscreenDialogTransition Widget.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.orange,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin{
AnimationController _animationController;
#override
void initState() {
_animationController = AnimationController(
vsync: this,
duration: Duration(milliseconds: 500),
);
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Stackoverflow playground'),
),
body: Container(
child: Column(
children: <Widget>[
CupertinoFullscreenDialogTransition(
primaryRouteAnimation: _animationController,
secondaryRouteAnimation: _animationController,
linearTransition: false,
child: Center(
child: Container(
color: Colors.blueGrey,
width: 300,
height: 300,
),
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
RaisedButton(
onPressed: () => _animationController.forward(),
child: Text('Forward'),
),
RaisedButton(
onPressed: () => _animationController.reverse(),
child: Text('Reverse'),
),
],
),
],
),
)
);
}
}
I'm trying to start a new screen within an onTap but I get the following error:
Navigator operation requested with a context that does not include a
Navigator.
The code I am using to navigate is:
onTap: () { Navigator.of(context).pushNamed('/settings'); },
I have set up a route in my app as follows:
routes: <String, WidgetBuilder>{
'/settings': (BuildContext context) => new SettingsPage(),
},
I've tried to copy the code using the stocks sample application. I've looked at the Navigator and Route documentation and can't figure out how the context can be made to include a Navigator. The context being used in the onTap is referenced from the parameter passed into the build method:
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
SettingsPage is a class as follows:
class SettingsPage extends Navigator {
Widget buildAppBar(BuildContext context) {
return new AppBar(
title: const Text('Settings')
);
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: buildAppBar(context),
);
}
}
TLDR: Wrap the widget which needs to access to Navigator into a Builder or extract that sub-tree into a class. And use the new BuildContext to access Navigator.
This error is unrelated to the destination. It happens because you used a context that doesn't contain a Navigator instance as parent.
How do I create a Navigator instance then ?
This is usually done by inserting in your widget tree a MaterialApp or WidgetsApp. Although you can do it manually by using Navigator directly but less recommended. Then, all children of such widget can access NavigatorState using Navigator.of(context).
Wait, I already have a MaterialApp/WidgetsApp !
That's most likely the case. But this error can still happens when you use a context that is a parent of MaterialApp/WidgetsApp.
This happens because when you do Navigator.of(context), it will start from the widget associated to the context used. And then go upward in the widget tree until it either find a Navigator or there's no more widget.
In the first case, everything is fine. In the second, it throws a
Navigator operation requested with a context that does not include a Navigator.
So, how do I fix it ?
First, let's reproduce this error :
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Center(
child: RaisedButton(
child: Text("Foo"),
onPressed: () => Navigator.pushNamed(context, "/"),
),
),
);
}
}
This example creates a button that attempts to go to '/' on click but will instead throw an exception.
Notice here that in the
onPressed: () => Navigator.pushNamed(context, "/"),
we used context passed by to build of MyApp.
The problem is, MyApp is actually a parent of MaterialApp. As it's the widget who instantiate MaterialApp! Therefore MyApp's BuildContext doesn't have a MaterialApp as parent!
To solve this problem, we need to use a different context.
In this situation, the easiest solution is to introduce a new widget as child of MaterialApp. And then use that widget's context to do the Navigator call.
There are a few ways to achieve this. You can extract home into a custom class :
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: MyHome()
);
}
}
class MyHome extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Center(
child: RaisedButton(
child: Text("Foo"),
onPressed: () => Navigator.pushNamed(context, "/"),
),
);
}
}
Or you can use Builder :
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Builder(
builder: (context) => Center(
child: RaisedButton(
child: Text("Foo"),
onPressed: () => Navigator.pushNamed(context, "/"),
),
),
),
);
}
}
Hy guys, i have the same problem. This is occur for me. The solution what i found is very simple. Only what i did is in a simple code:
void main() {
runApp(MaterialApp(
home: YOURAPP() ,
),
);
}
I hope was useful.
Make sure your current parent widget not with same level with MaterialApp
Wrong Way
class HomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
centerTitle: true,
title: Text('Title'),
),
body: Center(
child: Padding(
padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
child: RaisedButton(
onPressed: () {
//wrong way: use context in same level tree with MaterialApp
Navigator.push(context,
MaterialPageRoute(builder: (context) => ScanScreen()));
},
child: const Text('SCAN')),
)),
),
);
}
}
Right way
void main() => runApp(MaterialApp(
title: "App",
home: HomeScreen(),
));
class HomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
centerTitle: true,
title: Text('Title'),
),
body: Center(
child: Padding(
padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
child: RaisedButton(
onPressed: () {
//right way: use context in below level tree with MaterialApp
Navigator.push(context,
MaterialPageRoute(builder: (context) => ScanScreen()));
},
child: const Text('SCAN')),
)),
);
}
}
Just like with a Scaffold you can use a GlobalKey. It doesn't need context.
final _navKey = GlobalKey<NavigatorState>();
void _navigateToLogin() {
_navKey.currentState.popUntil((r) => r.isFirst);
_navKey.currentState.pushReplacementNamed(LoginRoute.name);
}
#override
Widget build(BuildContext context) {
return MaterialApp(
navigatorKey: _navKey,
...
);
}
I set up this simple example for routing in a flutter app:
import 'package:flutter/material.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
home: new MyHomePage(),
routes: <String, WidgetBuilder>{
'/settings': (BuildContext context) => new SettingsPage(),
},
);
}
}
class MyHomePage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('TestProject'),
),
body: new Center(
child: new FlatButton(
child: const Text('Go to Settings'),
onPressed: () => Navigator.of(context).pushNamed('/settings')
)
)
);
}
}
class SettingsPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('SettingsPage'),
),
body: new Center(
child: new Text('Settings')
)
);
}
}
Note, that the SettingsPage extends StatelessWidget and not Navigator. I'm not able to reproduce your error.
Does this example help you in building your app? Let me know if I can help you with anything else.
You should rewrite your code in main.dart
FROM:
void main() => runApp(MyApp());
TO
void main() {
runApp(MaterialApp(
title: 'Your title',
home: MyApp(),));}
The point is to have the home property to be your first page
this worked for me, I hope it will help someone in the future
A complete and tested solution:
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:my-app/view/main-view.dart';
class SplashView extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
home: Builder(
builder: (context) => new _SplashContent(),
),
routes: <String, WidgetBuilder>{
'/main': (BuildContext context) => new MainView()}
);
}
}
class _SplashContent extends StatefulWidget{
#override
_SplashContentState createState() => new _SplashContentState();
}
class _SplashContentState extends State<_SplashContent>
with SingleTickerProviderStateMixin {
var _iconAnimationController;
var _iconAnimation;
startTimeout() async {
var duration = const Duration(seconds: 3);
return new Timer(duration, handleTimeout);
}
void handleTimeout() {
Navigator.pushReplacementNamed(context, "/main");
}
#override
void initState() {
super.initState();
_iconAnimationController = new AnimationController(
vsync: this, duration: new Duration(milliseconds: 2000));
_iconAnimation = new CurvedAnimation(
parent: _iconAnimationController, curve: Curves.easeIn);
_iconAnimation.addListener(() => this.setState(() {}));
_iconAnimationController.forward();
startTimeout();
}
#override
Widget build(BuildContext context) {
return new Center(
child: new Image(
image: new AssetImage("images/logo.png"),
width: _iconAnimation.value * 100,
height: _iconAnimation.value * 100,
)
);
}
}
As per this comment If your navigator is inside Material context navigator push will give this error. if you create a new widget and assign it to the material app home navigator will work.
This won't work
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
home: new Scaffold(
appBar: new AppBar(
title: new Text("Title"),
),
body: new Center(child: new Text("Click Me")),
floatingActionButton: new FloatingActionButton(
child: new Icon(Icons.add),
backgroundColor: Colors.orange,
onPressed: () {
print("Clicked");
Navigator.push(
context,
new MaterialPageRoute(builder: (context) => new AddTaskScreen()),
);
},
),
),
);
}
}
This will work
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new MaterialApp(
home: new HomeScreen());
}
}
class HomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text("Title"),
),
body: new Center(child: new Text("Click Me")),
floatingActionButton: new FloatingActionButton(
child: new Icon(Icons.add),
backgroundColor: Colors.orange,
onPressed: () {
print("Clicked");
Navigator.push(
context,
new MaterialPageRoute(builder: (context) => new AddTaskScreen()),
);
},
),
);
}
}
I was facing the same problem and solved by removing home from MaterialApp and use initialRoute instead.
return MaterialApp(
debugShowCheckedModeBanner: false,
initialRoute: '/',
routes: {
'/': (context) => MyApp(),
'/settings': (context) => SettingsPage(),
},
);
And
onTap: () => {
Navigator.pushNamed(context, "/settings")
},
It is Simple
instead using this normal code
`runApp(BasicBankingSystem());`
wrap it with MaterialApp
runApp(MaterialApp(home: BasicBankingSystem()));
It happens because the context on the widget that tries to navigate is still using the material widget.
The short answer for the solution is to :
extract your widget
that has navigation to new class so it has a different context when calling the navigation
When your screen is not navigated from other screen,you don't initially have access to the navigator,Because it is not instantiated yet.So in that case wrap your widget with builder and extract context from there.This worked for me.
builder: (context) => Center(
child: RaisedButton(
child: Text("Foo"),
onPressed: () => Navigator.pushNamed(context, "/"),
),
You ca use this plugin
https://pub.dev/packages/get/versions/2.0.2
in The MaterialApp assign property navigatorKey: Get.key,
MaterialApp(
navigatorKey: Get.key,
initialRoute: "/",
);
you can access Get.toNamed("Your route name");
Change your main function example:
void main() {
runApp(
MaterialApp(
title: 'Your title',
home: MyApp(),
)
);
}
use this
void main() {
runApp(MaterialApp(debugShowCheckedModeBanner: false, home: MyApp()),);
}
instead of this
void main() {runApp(MyApp());}
Wrap with materialapp
reproduce code
import 'dart:convert';
import 'package:flutter/material.dart';
void main() {
// reproduce code
runApp(MyApp());
// working switch //
// runApp(
//
// MaterialApp(debugShowCheckedModeBanner: false, home: MyApp()),);
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body:
Column(mainAxisAlignment: MainAxisAlignment.center, children: [
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Container(
height: 100,
width: 100,
child: ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => IntroPage(Isscar4: true)),
);
},
child: RichText(
text: TextSpan(
text: 'CAR',
style: TextStyle(
letterSpacing: 3,
color: Colors.white,
fontWeight: FontWeight.w400),
children: [
TextSpan(
text: '4',
style: TextStyle(
fontSize: 25,
color: Colors.red,
fontWeight: FontWeight.bold))
],
)),
),
),
],
),
SizedBox(
height: 10,
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Container(
height: 100,
width: 100,
child: ElevatedButton(
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => IntroPage(Isscar4: false)),
);
},
child: RichText(
text: TextSpan(
text: 'BIKE',
style: TextStyle(
letterSpacing: 3,
color: Colors.white,
fontWeight: FontWeight.w400),
children: [
TextSpan(
text: '2',
style: TextStyle(
fontSize: 25,
color: Colors.red,
fontWeight: FontWeight.bold))
],
)),
),
),
],
)
])));
}
MaterialApp Swithwidget(istrue) {
return MaterialApp(
home: Scaffold(
body: IntroPage(
Isscar4: istrue,
),
),
);
}
}
class Hi extends StatelessWidget {
const Hi({Key? key}) : super(key: key);
#override
Widget build(BuildContext context) {
return Container(
child: Text("df"),
);
}
}
class IntroPage extends StatelessWidget {
final Isscar4;
IntroPage({
Key? key,
required this.Isscar4,
}) : super(key: key);
List<Widget> listPagesViewModel = [];
List<IntroModel> models = [];
#override
Widget build(BuildContext context) {
List<dynamic> intro = fetchIntroApi(Isscar4);
intro.forEach((element) {
var element2 = element as Map<String, dynamic>;
var cd = IntroModel.fromJson(element2);
models.add(cd);
});
models.forEach((element) {
listPagesViewModel.add(Text(""));
});
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body: Container(),
));
}
List fetchIntroApi(bool bool) {
var four = bool;
if (four) {
var data =
'[ {"name_Title": "title name1","description": "description1"}, {"name_Title": "title name2","description": "description2"}, {"name_Title": "title name3","description": "description3"}, {"name_Title": "title name4","description": "description4"} ]';
return json.decode(data);
} else {
var data =
'[ {"name_Title": "title name","description": "description1"}, {"name_Title": "title name2","description": "description2"}, {"name_Title": "title name3","description": "description3"} ]';
return json.decode(data);
}
}
}
class IntroModel {
String? nameTitle;
String? description;
IntroModel({this.nameTitle, this.description});
IntroModel.fromJson(Map<String, dynamic> json) {
nameTitle = json['name_Title'];
description = json['description'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['name_Title'] = this.nameTitle;
data['description'] = this.description;
return data;
}
}
class Splash extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Splash Screen',
theme: ThemeData(
primarySwatch: Colors.green,
),
home: MyState(),
debugShowCheckedModeBanner: false,
);
}
void main() {
runApp(Splash());
}
class MyState extends StatefulWidget{
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyState> {
#override
void initState() {
super.initState();
Timer(Duration(seconds: 3),
()=>Navigator.pushReplacement(context,
MaterialPageRoute(builder:
(context) =>
Login()
)
)
);
}
#override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center ,
children: [
Container(
child:
Image.asset("assets/images/herosplash.png"),
),
],
),
);
}
}
Builder(
builder: (context) {
return TextButton(
child: const Text('Bearbeiten'),
onPressed:(){
Navigator.push(
context,
MaterialPageRoute(builder: (context) => const gotothesiteyouwant()),
);
});
}
),
Here, all you need is to make MaterialApp the parent of your Build. This is because the context that you've used to navigate to a different screen is finding a MaterialApp or a WidgetApp as a parent of the build.
And Since in your case, the situation is the opposite, therefore you need to modify it by either calling a new Stateless widget the parent of is the MaterialApp or by simply using a Builder as home: Builder in MaterialApp.
Hope this would help!