Questions tagged [flutter-state]
369 questions
0
votes
0 answers
setState() or markNeedsBuild called during build while setting Provider value
class UserModel extends ChangeNotifier{
User _user;
set setuser(User user)
{
_user = user;
notifyListeners();
}
User get getuser{
return _user;
}
}
class UserLoader extends…
narayan rathod
- 81
- 11
0
votes
0 answers
Variables reset to default whenever I navigate with the bottomNavigationBar but reappear if I add a new item to my list
The Function of the App
It has a two items in the bottom navigation bar where in the first section (Courses) the user can add a list of courses and it will update their overall GPA and highest average for them each time they add a new one. The other…
Rohan Saxena
- 1
- 1
0
votes
1 answer
How to retrieve metadata from firebase storage?
info(String choice) async {
print(choice);
if (choice == 'Created on') {
print('hii');
StorageReference imageRef = storageRef.child(imageLocation);
await imageRef
.getMetadata()
.then((value) =>…
Rishabh Shukla
- 49
- 7
0
votes
1 answer
In Flutter, how can I read data from a child widget when callbacks are not available within the build method of the child?
I have an AppBar button where I want to read a childData list and do something with it:
class _ParentState extends State {
....
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
actions: [
…
Luke
- 37
- 7
0
votes
1 answer
How to use bloc in flutter without using any library
I want to manage the states of my app with bloc pattern, I have searched on the internet and find a lot of topics, but all are using third party libraries as I don't want.
So is there any resources or example which can help us to use bloc pattern…
Muhammad
- 2,572
- 4
- 24
- 46
0
votes
1 answer
How to call an async method in initState in flutter
I need to get some information from an endpoint. I have this method:
List cardsList = List();
List cardsId = List();
addToList() async {
var jsonData = await Provider.of(context).cardsList;
print(jsonData);
…
The Mir
- 400
- 1
- 8
- 17
0
votes
1 answer
Unable to access fetched data in initState in Flutter
I have class named Cards that has a method getCards that returns back a Future. I use this method to get cards from an endpoint.
Cards:
import 'dart:convert';
import 'package:http/http.dart' as http;
import…
The Mir
- 400
- 1
- 8
- 17
0
votes
1 answer
Flutter Bloc conflicting states
I'm trying to build a login activity using Bloc, with the help of the tutorials available at https://bloclibrary.dev/. I've successfully combined the Form Validation and Login Flow into a working solution, but things took a messy turn when adding a…
PM4
- 624
- 1
- 5
- 18
0
votes
0 answers
Streambuilder not getting called inside dialog box in flutter
I am using below code.
I click some button and if my OTP match below method is getting called. and in that method i am calling bloc.
Widget i am using is Statefulwidget.
void matchOtp() {
showDialog(
context: context,
builder:…
ios developer
- 3,363
- 3
- 51
- 111
0
votes
2 answers
save state from outer widget
I have an outer scaffold with an app bar with an action button that when clicked I want to save the state of an inner Stateful widget to perm storage - what is the best way to be able to call the inner widget method from the outer app bar and also…
Damian Hamill
- 83
- 1
- 6
0
votes
1 answer
In flutter, can you set the appbar backgorund to change base on the value of a dropdown box?
my drop down box cycles through 5 strings
['blue','red','yellow','orange','grey']
I want my appbar title to be that dropdown box and for the value in the dropdown to determine the appbar color
DropDownWidget ddw = DropDownWidget();
var color = {
…
Cdlrrcb
- 3
- 1
- 3
0
votes
1 answer
Flutter provider throwing error setState() or markNeedsBuild() called during build
I am trying to learn how to use the provider package, version 4.0+. I have copy-pasted solution provided by flutter team and run it on my emulator. The problem is, when I run it for the first time (cold start), I am getting the following error…
Robert J.
- 2,631
- 8
- 32
- 59
0
votes
1 answer
Issues with Flutter state
This is an experiment with Flutter. I was trying to create a paragraph generator in Flutter. Made a UI
Loaded the data from a List.
data.dart
class MyData {
static final List data1 = [
'0Title Of Page',
'3Paragraph title…
Vettiyanakan
- 7,957
- 6
- 37
- 55
0
votes
1 answer
Which one is faster and performant Provider, bloc pattern or flutter_redux?
I need manage the states globally, I find a lot of way, in terms of managing the state by using Provider bloc pattern redux and etc.
But actually I dont know, which one is faster and performant?
Example: I am working on chat application, which I…
Muhammad
- 2,572
- 4
- 24
- 46
-1
votes
0 answers
after update qty I call get cart details but screen not showing updates in cart in flutter
enter code here onChanged: (value) { setState(() {
cartProduct_list[0].products![index].quantity = value.toString();
});
isload = true;
…
Jaini Shah
- 45
- 3