Develop Reference

The following _CastError was thrown building ThemeSwitchingArea(dirty): Null check operator used on a null value

I am receiving the following error:
The following _CastError was thrown building ThemeSwitchingArea(dirty):
Null check operator used on a null value
I have highlighted the part where I am receiving the error. What are the necessary changes do I need to make? Any code fixation or anything that I should have to get the code working?
class EditProfilePage extends StatefulWidget {
#override
_EditProfilePageState createState() => _EditProfilePageState();
}
class _EditProfilePageState extends State<EditProfilePage> {
User user;
#override
void initState() {
super.initState();
user = UserPreferences.getUser();
}
#override
**Widget build(BuildContext context) => ThemeSwitchingArea(**
child: Builder(
builder: (context) => Scaffold(
appBar: buildAppBar(context),
body: ListView(
padding: EdgeInsets.symmetric(horizontal: 32),
physics: BouncingScrollPhysics(),
children: [
ProfileWidget(
imagePath: user.imagePath,
isEdit: true,
onClicked: () async {
final image = await ImagePicker()
.getImage(source: ImageSource.gallery);
if (image == null) return;
final directory = await getApplicationDocumentsDirectory();
final name = basename(image.path);
final imageFile = File('${directory.path}/$name');
final newImage =
await File(image.path).copy(imageFile.path);
setState(() => user = user.copy(imagePath: newImage.path));
},
),
const SizedBox(height: 24),
TextFieldWidget(
label: 'Full Name',
text: user.name,
onChanged: (name) => user = user.copy(name: name),
),
const SizedBox(height: 24),
TextFieldWidget(
label: 'Email',
text: user.email,
onChanged: (email) => user = user.copy(email: email),
),
const SizedBox(height: 24),
ButtonWidget(
text: 'Save',
onClicked: () {
UserPreferences.setUser(user);
Navigator.of(context).pop();
},
),
],
),
),
),
);
}

LateInitializationError: Field 'chatRoomsStream' has not been initialized in Flutter

I'm building a Messenger app on Flutter using Firebase and when I click to chat with another user - I get this exception before the previous messages are loaded.
======== Exception caught by widgets library =======================================================
The following LateError was thrown building ChatRoom(dirty, state: _ChatRoomState#be2bb):
LateInitializationError: Field 'chatRoomsStream' has not been initialized.
The relevant error-causing widget was:
ChatRoom file:///D:/Android/chat_app/lib/main.dart:47:55
When the exception was thrown, this was the stack:
#0 _ChatRoomState.chatRoomsStream (package:chat_app/views/chatRoomsScreen.dart)
#1 _ChatRoomState.chatRoomList (package:chat_app/views/chatRoomsScreen.dart:29:15)
#2 _ChatRoomState.build (package:chat_app/views/chatRoomsScreen.dart:83:15)
#3 StatefulElement.build (package:flutter/src/widgets/framework.dart:4691:27)
#4 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4574:15)
...
====================================================================================================
This is the chatRoomsScreen.dart page that is causing the issue, this is the page that is loaded every time a user wants to chat with another user:
import 'package:chat_app/helper/authenticate.dart';
import 'package:chat_app/helper/constants.dart';
import 'package:chat_app/helper/helperfunctions.dart';
import 'package:chat_app/services/auth.dart';
import 'package:chat_app/services/database.dart';
import 'package:chat_app/views/conversationScreen.dart';
import 'package:chat_app/views/search.dart';
import 'package:chat_app/views/signin.dart';
import 'package:chat_app/widgets/widgets.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
class ChatRoom extends StatefulWidget {
const ChatRoom({Key? key}) : super(key: key);
#override
_ChatRoomState createState() => _ChatRoomState();
}
class _ChatRoomState extends State<ChatRoom> {
AuthMethods authMethods = new AuthMethods();
DatabaseMethods databaseMethods = new DatabaseMethods();
late Stream<QuerySnapshot> chatRoomsStream;
Widget chatRoomList() {
return StreamBuilder(
stream: chatRoomsStream,
builder: (context, snapshot) {
return snapshot.hasData ? ListView.builder(
itemCount: (snapshot.data as QuerySnapshot).docs.length,
itemBuilder: (context, index) {
return ChatRoomsTile(
(snapshot.data as QuerySnapshot).docs[index]["chatroomid"]
.toString().replaceAll("_", "")
.replaceAll(Constants.myName, ""),
(snapshot.data as QuerySnapshot).docs[index]["chatroomid"]
);
},
) : Container();
},
);
}
#override
void initState() {
getUserInfo();
super.initState();
}
getUserInfo() async {
Constants.myName = (await HelperFunctions.getUserNameSharedPreference())!;
databaseMethods.getChatRooms(Constants.myName).then((value) {
setState(() {
chatRoomsStream = value;
});
});
setState(() {
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Image.asset("assets/images/logo.png", height: 50.0),
actions: [
GestureDetector(
onTap: () {
authMethods.signOut();
Navigator.pushReplacement(context,
MaterialPageRoute(builder: (context) => Authenticate()
));
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 16),
child: Icon(Icons.exit_to_app)),
),
],),
body: chatRoomList(),
floatingActionButton: FloatingActionButton(
onPressed: () {
Navigator.pushReplacement(context, MaterialPageRoute(
builder: (context) => SearchScreen()
));
},
child: Icon(Icons.search),
),
);
}
}
class ChatRoomsTile extends StatelessWidget {
late final String userName;
late final String chatRoomId;
ChatRoomsTile(this.userName,this.chatRoomId);
#override
Widget build(BuildContext context) {
return GestureDetector(
onTap: () {
Navigator.push(context, MaterialPageRoute(
builder: (context) => ConversationScreen(chatRoomId: chatRoomId)
));
},
child: Container(
padding: EdgeInsets.symmetric(horizontal: 24, vertical: 20),
child: Row(
children: [
Container(
height: 40,
width: 40,
alignment: Alignment.center,
decoration: BoxDecoration(
color: Colors.amber,
borderRadius: BorderRadius.circular(30)),
child: Text(userName.substring(0, 1),
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.white,
fontSize: 16,
fontFamily: 'OverpassRegular',
fontWeight: FontWeight.w300)),
),
SizedBox(width: 12,),
Text(userName, style: mediumTextStyle(),),
],
),
),
);
}
}
What am I doing wrong with chatRoomsStream? I'm initializing it as early as I can and to me, it's done as it should be. Perhaps one of you can point out why I'm getting this exception every time this page is loaded - help would be greatly appreciated, thanks.

instead of late Stream<QuerySnapshot> chatRoomsStream;
use Stream<QuerySnapshot>? chatRoomsStream;
and when you call the chatRoomStream
call it as chatRoomStream!
this is null safety
know about null safety

For your kind information, Using late keyword means that the instant will be initialized when you use it for the first time.
Like:
late int value = 5;
late int value; // you got the error
For more about sound null safety
More about lazy initialization
N.B: In your case, you can remove late, otherwise initialize it.

Use Provider to update Scaffold from a second screen

I want to have a Settings screen where I can choose a color to be returned to the first screen.
I can't get the first screen to update when the Setting screen is closed.
I'm using the Provider as a change notifier. But I can't see how to trigger the update of the first screen. The third button creates an event which updates the screen, but can this be done automatically?
What am I missing...?
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
void main() => runApp(MyApp());
Color bgColor = Colors.yellow[100];
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(home: MyHomeScreen());
}
}
class MyHomeScreen extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider(create: (context) => ColorModel()),
],
child: Consumer<ColorModel>(builder: (context, colorModel, child) {
return Scaffold(
appBar: AppBar(title: Text('Thanks for your help :)')),
body: Container(
constraints: BoxConstraints.expand(),
color: bgColor,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text('Change background color on this screen'),
OutlinedButton(
style: OutlinedButton.styleFrom(
backgroundColor: Colors.green[600],
),
child:
Text('Button1', style: TextStyle(color: Colors.white)),
onPressed: () {
var result = Navigator.push(
context, MaterialPageRoute(builder: (context) => Screen2()));
print('>>> Button1-onPressed completed, result=$result');
},
),
OutlinedButton(
style: OutlinedButton.styleFrom(
backgroundColor: Colors.green[600],
),
child:
Text('Choose a colour', style: TextStyle(color: Colors.white)),
onPressed: () {
asyncButton(context);
print('>>> Screen1 Button-onPressed completed');
},
),
OutlinedButton(
style: OutlinedButton.styleFrom(
backgroundColor: Colors.green[600],
),
child:
Text('Now try me', style: TextStyle(color: Colors.white)),
onPressed: () {
colorModel.notifyListeners();
},
),
],
),
),
);
}),
);
}
void asyncButton(BuildContext context) async {
var result = await Navigator.push(
context, MaterialPageRoute(builder: (context) => Screen2()));
print('>>> asyncButton completed: result = $result');
bgColor = result;
}
}
class ColorModel with ChangeNotifier {
void updateDisplay() {
notifyListeners();
}
}
class Screen2 extends StatelessWidget {
int _value;
List<String> names = ['Red', 'Green', 'Blue'];
List<Color> colors = [Colors.red[100], Colors.green[100], Colors.blue[100]];
#override
Widget build(BuildContext context) {
return MultiProvider(
providers: [
ChangeNotifierProvider(create: (context) => ColorModel()),
],
child: Scaffold(
appBar: AppBar(
toolbarHeight: 80,
backgroundColor: Colors.blue,
title: Center(child: Text('Screen2')),
),
body: Container(
constraints: BoxConstraints.expand(),
color: Colors.white,
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Consumer<ColorModel>(builder: (context, colorModel, child) {
return DropdownButton(
value: _value,
hint: Text("Select a color"),
focusColor: Colors.lightBlue,
onChanged: (int value) {
Navigator.pop(context, colors[value]);
},
items: [
DropdownMenuItem(value: 0, child: Text(names[0])),
DropdownMenuItem(value: 1, child: Text(names[1])),
DropdownMenuItem(value: 2, child: Text(names[2])),
],
);
}),
],
),
),
),
);
}
}

Navigator.push is tricky to use with Provider. It causes a lot of "Could not find the correct Provider above this Navigator Widget" errors. I've explained why in this answer to a related question.
Here's a quick overview of your situation:
Provider Scope
Architecture in question code:
MaterialApp
> provider(Screen A)
> provider(Screen B)
Architecture in solution below:
provider(MaterialApp)
> Screen A
> Screen B
Here's your code sample, shortened up, working with Provider, updating the background color on Page 1 from the Page 2.
I've put comments throughout the code to explain changes.
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
// - global var removed -
// Color bgColor = Colors.yellow[100];
void main() {
runApp(ProviderApp());
}
class ProviderApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
/// Define your Provider here, above MaterialApp
return ChangeNotifierProvider(
create: (context) => ColorModel(),
child: MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
home: ScreenA()
),
);
}
}
class ScreenA extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Thanks for your help :)')),
body: Container(
constraints: BoxConstraints.expand(),
//
// color: bgColor // - global var removed -
color: Provider.of<ColorModel>(context).bgColor,
// ↑ use your Provider state-stored value here ↑
//
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text('Change background color on this screen'),
OutlinedButton(
style: OutlinedButton.styleFrom(
backgroundColor: Colors.green[600],
),
child: Text('Go Screen B', style: TextStyle(color: Colors.white)),
// Navigator.push returns a Future, must async/await to use return value
onPressed: () async {
var result = await Navigator.of(context).push(
MaterialPageRoute(builder: (context) => ScreenB()));
// note that this context is not Screen A context, but MaterialApp context
// see https://stackoverflow.com/a/66485893/2301224
print('>>> Button1-onPressed completed, result=$result');
},
),
],
),
),
);
}
}
/// This is your state object. Store your state here.
/// Create this once and use anywhere you need. Don't re-create this unless
/// you want to wipe out all state data you were holding/sharing.
class ColorModel with ChangeNotifier {
// color is the state info you want to store & share
Color bgColor = Colors.yellow[100]; // initialized to yellow
/// Update your state value and notify any interested listeners
void updateBgColor(Color newColor) {
bgColor = newColor;
notifyListeners();
}
/// - removed - replaced with updateBgColor ↑
/*void updateDisplay() {
notifyListeners();
}*/
}
class ScreenB extends StatelessWidget {
// all fields in StatelessWidgets should be final
//final int value; // this value isn't needed
final List<String> names = ['Red', 'Green', 'Blue'];
final List<Color> colors = [Colors.red[100], Colors.green[100], Colors.blue[100]];
#override
Widget build(BuildContext context) {
/// Instantiating your model & giving it to Provider to should only happen once per
/// Widget Tree that needs access to that state. e.g. MaterialApp for this solution
/// The state object & Provider below was repeated & has been commented out / removed.
/// This was wiping out any previously stored state and creating a new Provider / Inherited scope
/// to all children.
/*return MultiProvider(
providers: [
ChangeNotifierProvider(create: (context) => ColorModel()),
],
child: ,
);*/
// - end of duplicate Provider removal -
return Scaffold(
appBar: AppBar(
title: Text('Screen2'),
),
body: Container(
alignment: Alignment.center,
child: Consumer<ColorModel>(builder: (context, colorModel, child) {
return DropdownButton(
//value: value, // this value isn't needed
hint: Text("Select a color"),
onChanged: (int value) {
colorModel.updateBgColor(colors[value]);
Navigator.pop(context, colors[value]);
},
items: [
DropdownMenuItem(value: 0, child: Text(names[0])),
DropdownMenuItem(value: 1, child: Text(names[1])),
DropdownMenuItem(value: 2, child: Text(names[2])),
],
);
}),
),
);
}
}

Flutter/Dart Android App NoSuchMethodError

I got a quick question about a flutter/dart app I am making throwing this certain error.
It has something to do with my showadddialog class. When I press the flatbutton with the text "save" in _showAddDialog() it works fine but my app crashes if I tap out of the alert dialog window without entering anything or if I press the flatbutton named "delete", and both actions give the same error. however, when I restart I can see that the delete button still worked to delete the events from the shared preferences, it just crashed afterward. What could be causing this in my code? Idk where it could be calling a map on null...
Screenshot reference: https://gyazo.com/f894ae742ea50cd714026b1bbe753678
════════ Exception caught by widgets library ═══════════════════════════════════
The following NoSuchMethodError was thrown building HomePage(dirty, dependencies: [_LocalizationsScope-[GlobalKey#42494], _InheritedTheme], state: _HomePageState#acde6):
The method 'map' was called on null.
Receiver: null
Tried calling: map<Widget>(Closure: (dynamic) => ListTile)
The relevant error-causing widget was
HomePage
package:hello_world/main.dart:16
When the exception was thrown, this was the stack
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1 _HomePageState.build
package:hello_world/main.dart:135
#2 StatefulElement.build
package:flutter/…/widgets/framework.dart:4334
#3 ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4223
#4 Element.rebuild
package:flutter/…/widgets/framework.dart:3947
...
════════════════════════════════════════════════════════════════════════════════
Code here:
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:table_calendar/table_calendar.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Calendar',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: HomePage(),
);
}
}
class HomePage extends StatefulWidget {
#override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
CalendarController _controller;
Map<DateTime, List<dynamic>> _events;
List<dynamic> _selectedEvents;
TextEditingController _eventController;
SharedPreferences prefs;
#override
void initState() {
super.initState();
_controller = CalendarController();
_eventController = TextEditingController();
_events = {};
_selectedEvents = [];
initPrefs();
}
initPrefs() async {
prefs = await SharedPreferences.getInstance();
setState(() {
_events = Map<DateTime, List<dynamic>>.from(
decodeMap(json.decode(prefs.getString("events") ?? "{}"))
);
});
}
Map<String, dynamic> encodeMap(Map<DateTime, dynamic> map) {
Map<String, dynamic> newMap = {};
map.forEach((key, value) {
newMap[key.toString()] = map[key];
});
return newMap;
}
Map<DateTime, dynamic> decodeMap(Map<String, dynamic> map) {
Map<DateTime, dynamic> newMap = {};
map.forEach((key, value) {
newMap[DateTime.parse(key)] = map[key];
});
return newMap;
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flutter Calendar'),
),
body: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
TableCalendar(
events: _events,
initialCalendarFormat: CalendarFormat.week,
calendarStyle: CalendarStyle(
canEventMarkersOverflow: true,
todayColor: Colors.orange,
selectedColor: Theme.of(context).primaryColor,
todayStyle: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 18.0,
color: Colors.white
)
),
headerStyle: HeaderStyle(
centerHeaderTitle: true,
formatButtonDecoration: BoxDecoration(
color: Colors.orange,
borderRadius: BorderRadius.circular(20.0),
),
formatButtonTextStyle: TextStyle(color: Colors.white),
formatButtonShowsNext: false,
),
startingDayOfWeek: StartingDayOfWeek.sunday,
onDaySelected: (date, events) {
setState(() {
_selectedEvents = events;
});
},
builders: CalendarBuilders(
selectedDayBuilder: (context, date, events) => Container(
margin: const EdgeInsets.all(4.0),
alignment: Alignment.center,
decoration: BoxDecoration(
color: Theme.of(context).primaryColor,
borderRadius: BorderRadius.circular(10.0)
),
child: Text(
date.day.toString(),
style: TextStyle(color: Colors.white),
)
),
todayDayBuilder: (context, date, events) => Container(
margin: const EdgeInsets.all(4.0),
alignment: Alignment.center,
decoration: BoxDecoration(
color: Colors.orange,
borderRadius: BorderRadius.circular(10.0)
),
child: Text(
date.day.toString(),
style: TextStyle(color: Colors.white),
)
),
),
calendarController: _controller,
),
..._selectedEvents.map((event) => ListTile(
title: Text(event),
)),
],
),
),
floatingActionButton: FloatingActionButton(
child: Icon(Icons.add),
onPressed: _showAddDialog,
),
);
}
_showAddDialog() async {
await showDialog(
context: context,
builder: (context) => AlertDialog(
content: TextField(
controller: _eventController,
),
actions: <Widget>[
FlatButton(
child: Text("Save"),
onPressed: () {
if (_eventController.text.isEmpty) return;
if (_events[_controller.selectedDay] != null) {
_events[_controller.selectedDay].add(_eventController.text);
} else {
_events[_controller.selectedDay] = [
_eventController.text
];
}
prefs.setString("events", json.encode(encodeMap(_events)));
_eventController.clear();
Navigator.pop(context);
},
),
FlatButton(
child: Text("Delete Events"),
onPressed: () {
setState(() {
_events.remove(_controller.selectedDay);
prefs.setString("events", json.encode(encodeMap(_events)));
_eventController.clear();
Navigator.pop(context);
},
);
}
)
],
)
);
setState(() {
_selectedEvents = _events[_controller.selectedDay];
});
}
}

I have gone through your code, and handled delete event null exception as per below.
Change your last setState code with below:
setState(() {
_selectedEvents = _events[_controller.selectedDay] ?? [];
});
Conclusion:
_selectedEvents null value can be handled by ?? [] in your code.

ListTile at Home screen is not updating with InheritedWidget

I'm getting started with flutter/dart and I'm trying to implement a simple note app using InheritedWidget and TextControllers, but when I add or edit some note it doesn't update the main screen. I printed the new notes list in console and it is updated with the addings and editings but is not updated in main screen, still showing the initial note list ({'title': 'someTitle1', 'text': 'someText1'}, ...).
main.dart :
void main() => runApp(NoteInheritedWidget(
MaterialApp(
title: 'Notes App',
home: HomeList(),
),
));
home screen scaffold body :
List<Map<String, String>> get _notes => NoteInheritedWidget.of(context).notes;
...
body: ListView.builder(
itemCount: _notes.length,
itemBuilder: (context, index) {
return Card(
margin: EdgeInsets.symmetric(vertical: 5, horizontal: 7),
child: ListTile(
onTap: () {
Navigator.push(context,
MaterialPageRoute(builder: (context) => NotePage(noteMode: NoteMode.Editing, index: index))
);
print(_notes);
},
trailing: Icon(Icons.more_vert),
title: _NoteTitle(_notes[index]['title']),
subtitle: _NoteText(_notes[index]['text']),
),
);
},
),
Add/Edit Note page :
enum NoteMode {
Adding,
Editing
}
class NotePage extends StatefulWidget {
final NoteMode noteMode;
final int index;
const NotePage ({this.noteMode, this.index});
#override
_NotePageState createState() => _NotePageState();
}
class _NotePageState extends State<NotePage> {
final TextEditingController _titleController = TextEditingController();
final TextEditingController _textController = TextEditingController();
List<Map<String, String>> get _notes => NoteInheritedWidget.of(context).notes;
#override
void didChangeDependencies() {
if (widget.noteMode == NoteMode.Editing) {
_titleController.text = _notes[widget.index]['text'];
_textController.text = _notes[widget.index]['title'];
}
super.didChangeDependencies();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(
widget.noteMode == NoteMode.Adding ? 'Add Note' : 'Edit Note'
),
centerTitle: true,
backgroundColor: Colors.indigo[700],
),
body: Padding(
padding: const EdgeInsets.symmetric(vertical: 30, horizontal: 20),
child: SingleChildScrollView(
child: Column(
children: <Widget>[
TextField(
controller: _titleController,
decoration: InputDecoration(
hintText: 'Note Title',
border: OutlineInputBorder(),
),
),
SizedBox(height: 20),
TextField(
controller: _textController,
maxLines: 20,
decoration: InputDecoration(
hintText: 'Note Text',
border: OutlineInputBorder(),
),
),
SizedBox(height: 10),
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
_NoteButton(Icons.save, 'Save', () {
final title = _titleController.text;
final text = _textController.text;
if (widget.noteMode == NoteMode.Adding) {
_notes.add({'title': title, 'text': text});
print(_notes);
} else if (widget.noteMode == NoteMode.Editing) {
_notes[widget.index] = {'title': title, 'text': text};
print(_notes);
}
Navigator.pop(context);
}),
_NoteButton(Icons.clear, 'Discard', () {
Navigator.pop(context);
}),
if (widget.noteMode == NoteMode.Editing)
_NoteButton(Icons.delete, 'Delete', () {
_notes.removeAt(widget.index);
Navigator.pop(context);
}),
],
),
],
),
),
),
);
}
}
InheritedWidget :
class NoteInheritedWidget extends InheritedWidget {
final notes = [
{'title': 'someTitle1', 'text': 'someText1'},
{'title': 'someTitle2', 'text': 'someText2'},
{'title': 'someTitle3', 'text': 'someText3'}
];
NoteInheritedWidget(Widget child) : super(child: child);
static NoteInheritedWidget of(BuildContext context) {
return context.dependOnInheritedWidgetOfExactType<NoteInheritedWidget>();
}
#override
bool updateShouldNotify(NoteInheritedWidget old) {
return old.notes != notes;
}
}
Home screen after add a note :
HomeScreen
List of notes printed in console after add a note :
I/flutter (18079): [{title: someTitle1, text: someText1}, {title: someTitle2, text: someText2}, {title: someTitle3, text: someText3}, {title: NewAddNoteTitle, text: NewAddNoteText}]
I'm using Android Studio and a real device instead an emulator.
I can't find the error and if you have another way to do this 'update' please show me.

I found a solution using the onPressed method as async and then an empty setState, is there any problem for the code doing this?
code:
child: ListTile(
onTap: () async {
await Navigator.push(context,
MaterialPageRoute(builder: (context) => NotePage(noteMode: NoteMode.Editing, index: index))
);
setState(() {});
print(_notes);
},
...
floatingActionButton: FloatingActionButton(
onPressed: () async {
await Navigator.push(context,
MaterialPageRoute(builder: (context) => NotePage(noteMode: NoteMode.Adding))
);
setState(() {});
print(_notes.length);
print(_notes);
},