I am currently on chapter 25 of course 30days with flutter by mtechviral. My issue is as per your code, VxState.listen must work but to me its showing error.
The error is "The method 'listen' isn't defined for the type 'VxState'.
Try correcting the name to the name of an existing method, or defining a method named 'listen'."

Any help would be appreciated.

after using dart class file generator as per the video, app tries to fetch the json file but it keeps loading and loading and unable to fetch the images and their related items

I am having problem in this file.

textTheme: Theme.of(context).textTheme,

can't understand this line

https://github.com/iampawan/30DaysOfFlutter/blob/02f7ca0a43705d89ef9836eebec74ece6e331d93/lib/widgets/themes.dart

This does not work anymore, it gives an error

The property 'isEmpty' can't be unconditionally accessed because the receiver can be 'null'. 

Similarly,

This also give error

The method 'validate' can't be unconditionally invoked because the receiver can be 'null'. 

I have already opened the original issues here on Flutter's official Github Issues page, but as I'm doing 30 Days of Flutter , I thought that I should share my issue here to.

Anyone can please check the original issue here - https://github.com/flutter/flutter/issues/82411

@iampawan @arps18

I removed the first item which is added on catalog.dart . Logically if we see, it can be null so that we fetch data from network or json files. But after removing that first item. It shows an error.
class CatalogModel { static List<Item> items; }
Please review it once.

Encountered following bugs and applied undermentioned fixes

items were not initialized -> initialized as empty list
static List<Item> items = List.empty();
required field missing in Item() constructor -> added required keyword
Item({required this.id, ....});
Null safety found missing in copyWith()
Item copyWith({ String? id ...
In factory fromMap() the line which checks map nullability throwing error -> commented
//if (map == null) return null;
In home.dart list was not mapping to model -> distributed into two assignments
List<Item> list = List.from(productsData)
.map<Item>((item) => Item.fromMap(item))
.toList();
CatalogModel.items = list;

onPressed: () {
_cart.remove(_cart.items[index]) ;
setState() {} ;
},
g a
// this code is being applied but not removing the items from cart

Error in Chapter 27 (HTTP | API | Networking | Badge) while Fetching data from the jsonbin.io API

Error: Unhandled Exception: type 'Null' is not a subtype of type 'Iterable'

**Effect: ** Screen stuck in loading screen

I guess the size problem comes from parent widgets. I tried using SingleChildScrolView but didnt work.

Hello Pawan,

I know this is not an issue, but I need your help, if we have a list of items of 2-3 pages with different JSON data, how we can manage the code of add to favourite, it will work with one list(one JSON data), when we go to another page with another JSON data it's not working. It's working one at a time with the list. Can you please suggest the code, how we can do this.

On line number 110: catalog.desc.text.textStyle(context.captionStyle).make(),

Got this issue: The argument type 'TextStyle?' can't be assigned to the parameter type 'TextStyle'.

I tried and fixed by:
catalog.desc.text.caption(context).make(),

Please review this also.

In integration_test,inside app_test.dart it is showing the function run isn't defined....

That's why the system can't debug the app......

please suggest any solution

The function 'run' isn't defined.
Try importing the library that defines 'run', correcting the name to the name of an existing function, or defining a function named 'run'.

VxBuilder(
            mutations: {RemoveMutation},
            builder: (context) {
              return "\$${_cart.totalPrice}"
                  .text
                  .xl5
                  .color(context.theme.accentColor)
                  .make();
            },
)

)

error messege: The argument type 'Widget Function(BuildContext)' can't be assigned to the parameter type 'Widget Function(BuildContext, dynamic, VxStatus?)'.dartargument_type_not_assignable

After clicking Login button the screen is changing even if the text and password fields are empty

import 'package:first_app/utils/approutes.dart';
import 'package:flutter/material.dart';

class Login extends StatefulWidget {
  @override
  _LoginState createState() => _LoginState();
}

class _LoginState extends State<Login> {
  String name = "";
  bool changebtn = false;
  final _formkey = GlobalKey<FormState>();

  movetohome(BuildContext context) async {
    if (_formkey.currentState!.validate()) {
      setState(() {
        changebtn = true;
      });
    }
    // push to move to next route

    await Future.delayed(Duration(seconds: 1));
    await Navigator.pushNamed(context, Approutes.homeRoute);
    setState(() {
      changebtn = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Material(
        color: Colors.white,
        child: SingleChildScrollView(
          child: Form(
            key: _formkey,
            child: Column(
              children: [
                Image.asset(
                  "assets/images/top.png",
                  fit: BoxFit.cover,
                ),
                SizedBox(
                  height: 80.0,
                ),
                Text(
                  "Welcome $name",
                  style: TextStyle(fontWeight: FontWeight.bold, fontSize: 28),
                ),
                Padding(
                  padding: const EdgeInsets.symmetric(
                      vertical: 30.0, horizontal: 40.0),
                  child: Column(
                    children: [
                      TextFormField(
                        onChanged: (value) {
                          name = value;
                          setState(() {});
                        },
                        style: TextStyle(fontSize: 20),
                        decoration: InputDecoration(
                            hintText: "Enter username", labelText: "username"),
                        validator: (value) {
                          if (value!.isEmpty) {
                            return "Username cannot be empty";
                          }
                          return null;
                        },
                      ),
                      TextFormField(
                        style: TextStyle(fontSize: 20),
                        obscureText: true,
                        decoration: InputDecoration(
                            hintText: "Enter password", labelText: "password"),
                        validator: (value) {
                          if (value!.isEmpty) {
                            return "Password cannot be empty";
                          } else if (value.length < 6) {
                            return "Password length should be atleast 6";
                          }
                          return null;
                        },
                      ),
                      SizedBox(
                        height: 50.0,
                      ),
                      Material(
                        color: Colors.pinkAccent,
                        borderRadius: BorderRadius.circular(changebtn ? 60 : 8),
                        child: InkWell(
                          splashColor: Colors.yellow,
                          onTap: () => movetohome(context),
                          child: AnimatedContainer(
                            duration: Duration(seconds: 1),
                            width: changebtn ? 60 : 160,
                            height: 60,
                            // styling

                            alignment: Alignment.center,
                            child: changebtn
                                ? Icon(Icons.done)
                                : Text(
                                    "Login",
                                    style: TextStyle(
                                        fontSize: 25,
                                        color: Colors.white,
                                        fontWeight: FontWeight.bold),
                                  ),
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ));
  }
}

Thanks for making this tutorial series. These are classic 🚀

After change focus , Shortcuts keys are not working again.

For example :
Suppose that If we have TextField in the same screen and focus on the textField (or remove focus from the textField after get once focused on it) and using the same shortcut key for the same. Shortcut keys are not working again.

I am such error while running after encoding json file

please help

this is my code
class CatalogModel {
static List items = [
Item(
id: 1,
name: "Monkey D. Luffy",
desc: "KING OF THE PIRATES",
price: 999,
color: "#ed1111",
image:
"data:image/jpeg;base64,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",
)
];
}

class Item {
final int id;
final String name;
final String desc;
final num price;
final String color;
final String image;

Item(
{required this.id,
required this.name,
required this.desc,
required this.price,
required this.color,
required this.image});

factory Item.fromMap(Map<String, dynamic> map) {
return Item(
id: map["id"],
name: map["name"],
desc: map["desc"],
color: map["color"],
image: map["image"],
price: map["price"],
);
}
}

Day 12 : I'm not able to scroll down in the catalog app when we are adding 50 items
class HomePage extends StatelessWidget {
const HomePage({super.key});

@OverRide
Widget build(BuildContext context) {
// int days = 30;
// String name = "codepur";
final dummyList = List.generate(50, (index) => CatalogModel.items[0]);

return Scaffold(  
  appBar: AppBar(
    title: Text("Catalog App",
    ),
    
  ),
  body: Padding(
    padding: const EdgeInsets.all(16.0),
    child: ListView.builder(
      itemCount: dummyList.length,
      itemBuilder: (context, index) {
        return ItemWidget(
          item : dummyList[index],

I use it with the F1 ,F3, F11 keys on my keyboard when I press them repeatedly. It will drop and go to work in the browser instead.

Hi, I wanna ask can we do like that the items which get added to the cart should still be visible in the cart after reopening the app with shared preferences ?

when I use if statement to validate talking about this if statement:
movetoHome(BuildContext context) async { if (_formKey.currentState!.validate()) { setState(() { changebutton = true; }); await Future.delayed(Duration(seconds: 1)); await Navigator.pushNamed(context, Myroutes.homeRoute); setState(() { changebutton = false; }); } }

1. 1. If I run using f5 it takes me to breaking point in feedback.dart at line 107 "return Future.value();"
2. if I run using terminal it gives me this error:
   Error: Unexpected null value.
   at Object.throw_ [as throw] (http://localhost:53848/dart_sdk.js:5348:11)
   at Object.nullCheck (http://localhost:53848/dart_sdk.js:5681:30)
   at login_page._LoginPageState.new.movetoHome (http://localhost:53848/packages/learning/pages/login_page.dart.lib.js:644:28)
   at movetoHome.next ()
   at runBody (http://localhost:53848/dart_sdk.js:39250:34)
   at Object._async [as async] (http://localhost:53848/dart_sdk.js:39281:7)
   at login_page._LoginPageState.new.movetoHome (http://localhost:53848/packages/learning/pages/login_page.dart.lib.js:643:20)
   at http://localhost:53848/packages/learning/pages/login_page.dart.lib.js:677:569
   at ink_well._InkResponseState.new.[_handleTap] (http://localhost:53848/packages/flutter/src/material/icon_button.dart.lib.js:50393:31)
   at tap.TapGestureRecognizer.new.invokeCallback (http://localhost:53848/packages/flutter/src/gestures/recognizer.dart.lib.js:194:18)
   at tap.TapGestureRecognizer.new.handleTapUp (http://localhost:53848/packages/flutter/src/gestures/tap.dart.lib.js:408:40)
   at tap.TapGestureRecognizer.new.[_checkUp] (http://localhost:53848/packages/flutter/src/gestures/tap.dart.lib.js:214:12)
   at tap.TapGestureRecognizer.new.handlePrimaryPointer (http://localhost:53848/packages/flutter/src/gestures/tap.dart.lib.js:160:23)
   at tap.TapGestureRecognizer.new.handleEvent (http://localhost:53848/packages/flutter/src/gestures/recognizer.dart.lib.js:449:16)
   at pointer_router.PointerRouter.new.[_dispatch] (http://localhost:53848/packages/flutter/src/gestures/pointer_router.dart.lib.js:93:9)
   at http://localhost:53848/packages/flutter/src/gestures/pointer_router.dart.lib.js:128:26
   at LinkedMap.new.forEach (http://localhost:53848/dart_sdk.js:26346:11)
   at pointer_router.PointerRouter.new.[_dispatchEventToRoutes]
   (http://localhost:53848/packages/flutter/src/gestures/pointer_router.dart.lib.js:125:29)
   at pointer_router.PointerRouter.new.route (http://localhost:53848/packages/flutter/src/gestures/pointer_router.dart.lib.js:117:37)
   at binding$5.WidgetsFlutterBinding.new.handleEvent (http://localhost:53848/packages/flutter/src/gestures/binding.dart.lib.js:389:26)
   at binding$5.WidgetsFlutterBinding.new.dispatchEvent (http://localhost:53848/packages/flutter/src/gestures/binding.dart.lib.js:372:24)
   at binding$5.WidgetsFlutterBinding.new.dispatchEvent (http://localhost:53848/packages/flutter/src/rendering/layer.dart.lib.js:5376:13)
   at binding$5.WidgetsFlutterBinding.new.[_handlePointerEventImmediately]
   (http://localhost:53848/packages/flutter/src/gestures/binding.dart.lib.js:343:14)
   at binding$5.WidgetsFlutterBinding.new.handlePointerEvent
   (http://localhost:53848/packages/flutter/src/gestures/binding.dart.lib.js:316:43)
   at binding$5.WidgetsFlutterBinding.new.[_flushPointerEventQueue]
   (http://localhost:53848/packages/flutter/src/gestures/binding.dart.lib.js:305:14)
   at binding$5.WidgetsFlutterBinding.new.[_handlePointerDataPacket]
   (http://localhost:53848/packages/flutter/src/gestures/binding.dart.lib.js:295:65)
   at Object.invoke1 (http://localhost:53848/dart_sdk.js:186355:7)
   at _engine.EnginePlatformDispatcher..invokeOnPointerDataPacket (http://localhost:53848/dart_sdk.js:166281:15)
   at _engine.PointerBinding..[_onPointerData] (http://localhost:53848/dart_sdk.js:166941:49)
   at http://localhost:53848/dart_sdk.js:167399:28
   at http://localhost:53848/dart_sdk.js:167352:16
   at http://localhost:53848/dart_sdk.js:167045:11