I wanted to put images which were in assets folder but this error happens repeatly: The argument type ‘Object?’ can’t be assigned to the parameter type ‘String’. this is my product.dart: class Product { final String title, description; final List<String> images; final double rating, price; final bool isFavourite, isPopular; Product( {required this.images, this.rating = 0.0,… Read More How can I resolve "The argument type 'Object?' can't be assigned to the parameter type 'String'"?

I have a button in my Flutter app. onPressed: () async { try { final newUser = await _auth.createUserWithEmailAndPassword(email: email, password: password); if (newUser.user != null) { await Future.delayed(Duration.zero); Navigator.of(context).pushNamed(ChatScreen.id); } } catch (e) { print(e); } }, The IDE reports "Don’t use BuildContext across sync gaps.". What am I doing wrong ? >Solution :… Read More Don't use BuildContext across sync gaps

So, as far as I know to be able to create a const object of a class in dart you are required to declare const constructor and mark all the fields as final. Then to create a const object of the class you put a const key word before instantiating and to create non-const you… Read More How to create both const and non-const objects of one class?

I know, It is asked many time but none of the solution is working. There is a bank list in first drop down, On bank selection an api is being called for branch in second drop down after selection of branch for first time it is working fine, When bank is changed again api is… Read More Flutter Issue: Either zero or 2 or more [DropdownMenuItem]s were detected with the same value

Intro I have new project. I have pub.spec generated by Android studio official flutter plugin. Nothing manually added / changed in config. Problem When I run pub get I receive error: The current Dart SDK version is 3.1.3. Because my_app depends on dependencies any which doesn’t support null safety, version solving failed. The lower bound… Read More Dart null safety block me even without dependencies

I am trying to generate a list of widget after a null check for my object, but I get an error of "Expected an Identifier". The below is my example code: Column( children: [ <condition> ? for (var A in <List of object>) <MyWidget> : const SizedBox(height: 20, width: 20) ], ), >Solution : In… Read More Flutter generate list of widget in ternary operator prompt "Expected an Identifier"

I am getting this error message from timepicker in my flutter app: Don’t use ‘BuildContext’s across async gaps. Try rewriting the code to not reference the ‘BuildContext’. Here is the code I am using: if (selectedDay != null) { timeOfDay = await showTimePicker( context: context, initialTime: TimeOfDay.fromDateTime( now.add( const Duration(minutes: 1), ), ), builder: (BuildContext… Read More Flutter timepicker error: Don't use 'BuildContext's across async gaps. Try rewriting the code to not reference the 'BuildContext'

I’m using image_picker library to pick multiple images and using the uuid library to assign a unique uuid to each image. I have a line which is the following : final String ImageUuid = _uuid.v4(); which is equipped to return uuid for a single image. So, I have to transform the above to take a… Read More Declare a List of Uuid's from the uuid package

The Problem The isEmpty check is returning true for a non-empty String field. My guess is – TextEditingController’s String metadata is not updating with string update from an async load. I’m not sure if I’m missing something obvious or if this is a Dart/Flutter bug. Is there an idiomatic way to accomplish this check? Here’s… Read More IsEmpty check returning wrong value for TextEditingController

class Node { List<Node> children; } class TreeNode extends Node { @Override List<TreeNode> children; // ERROR: could not override writer method. } Is there a way to make generic so that: treeNode.children is List<TreeNode> >Solution : Create an abstract Node class with a generic type parameter T. This T will represent the type of children… Read More How to make a class itself generic?