Questions tagged [dart]
Dart is a class-based, statically(& strongly)-typed programming language for building web and mobile applications. Dart compiles to modern JavaScript to run in the browser and compiles to native code to run on mobile platforms like Android and iOS. Dart also runs on the command-line for scripting and server-side apps.
95,699
questions
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Can't figure out how to delete the numbers that I have generated with onPressed
I made a simple program with a Plus Button and a Minus Button that generates numbers successively.
Generating the numbers with the Plus Button works fine but, I tried to delete the numbers with the ...
- 49
7
votes
2
answers
8k
views
Clearing the terminal screen in a command-line Dart app
This one don't work (on Windows in a Cmd-Box):
import 'dart:io';
void main() {
print("Hello, World!");
Process.start('cls', [], runInShell: true).then((process) {
stdout.addStream(...
- 1
0
votes
0
answers
9
views
Horizontal tree indent guides is missing
I am using Android Studio . but I am unable to see this tree indent guides (like the fig. 2)
Please help me how to enable this option. I've tried to check the option in Settings -> Languages & ...
- 159
-1
votes
0
answers
9
views
My screen is blank when I start the application. It's a flutter app made using bloc cubit and custom backend using Node
https://github.com/varun-wahi/LeafNotes/tree/243eda07f55cf18537c0ad51d650abf1d9c167cd
if someone is willing to run and check the code. Or just give me tips where the error could be producing from. I ...
1
vote
3
answers
8k
views
Flutter how to share PDF files?
I'm trying to implement some new functionalities to my Flutter app such as sharing PDF files with people.
So I got 10 different pages and 10 different PDF files. On each page I want to implement a ...
- 66
2
votes
0
answers
311
views
Fabric.js Canvas equivalent widget in flutter
Is there any flutter widget like fabric.js canvas? We want to do image editing like multiple images drag and drop inside the canvas, freetransforming the image and entire canvas should be zoom in, ...
- 1
4
votes
4
answers
22k
views
Flutter Scrollbar in vertical and horizontal axis
I have two scrollbars in my flutter project for scrolling the data table. Here are the codes.
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: ...
- 256
1
vote
2
answers
9k
views
Unable to install dart-sdk?
I want to get stated with flutter-web so I am trying to install dart-sdk.
I tried to install it by ...
choco install dart-sdk
and its setup
... but it just doesn't install.
Instead, a script gives ...
- 659
0
votes
4
answers
1k
views
How to put a Divider between DropdownMenu items in Flutter
I have a DropdownMenu and I want to draw a horizontal divider(line) between DropDownMenuEntries.
'dropdownMenuEntries' property only expects a List of DropDownMenuEntry Widgets.
Any help would be ...
- 1,396
0
votes
2
answers
45
views
Access ThemeData property inside ThemeData definition
In my Flutter app I declare ThemeData with a colorSchemeSeed:
return MaterialApp(
...
theme: ThemeData(
useMaterial3: true,
visualDensity: VisualDensity.adaptivePlatformDensity,
...
- 7,891
11
votes
2
answers
2k
views
HTTP3 Client for flutter
Is There a HTTP3 client for dart? There is Flupke in Java, Aioqic in python but I didn't find one for dart as well as flutter
- 632
3
votes
2
answers
2k
views
How to throttle events in bloc?
How to throttle events in bloc? Let's say, I want to trigger file save on user input, but perform file system access not more often than once per 100ms?
Example bloc event handler:
on<StoreFile>(...
- 517
0
votes
0
answers
17
views
Flutter PDF Content on New Page Even if Space Above
I am trying to my _contentFooter() to break into page. When there are 4 row in _contentTable() It come exactly Bellow the table, but more row it comes on second page. Using flutter package https://pub....
- 2,080
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votes
0
answers
24
views
Using FirebaseAuth stateChanges to switch pageView index
I am trying to write an app and I have a section to display the users profile and a login/register prompt if they aren't signed in yet. I am using a pageView to switch between the 2 as I want to keep ...
0
votes
1
answer
14
views
List inside in two column show overflow issue
I have a overflow issue. I have list view inside of 2 column which show overflow issue.
Widget getViewMethod() {
return Column(children: [
Container(color: ColorConst.whiteColor, height: 40),
...
- 183
0
votes
0
answers
11
views
How to correctly handle dynamic content height with SliverOverlapAbsorber in NestedScrollView?
I’m working on a Flutter application where I’m using a NestedScrollView with a SliverAppBar, SliverList, and a SliverPersistentHeader that contains a TabBar. My goal is to manage overlapping content ...
- 59
0
votes
1
answer
20
views
Update of didChangeDependencies (Flutter)
I have a Dashboard homepage that allows me to access another page called Brand.
GoRoute(
name: DashboardPage.routeName,
path: DashboardPage.routeName,
builder: (context,...
0
votes
0
answers
28
views
How can I design piano buttons in dart?
I'm trying to design some piano buttons in Dart like in the image below.
I also want the piano keys to be horizontally scrollable. I don't want to have a specific width or height for the piano ...
0
votes
1
answer
13
views
how to set persian language to flutter_tts package
I am going to change the text to voice in flutter and I'm installed flutterTts package so its just read English text and its unable to read Persian language.
I also set the language to
flutterTts....
- 150
9
votes
4
answers
16k
views
Clear state in providers when using Flutter and Riverpod
How can I clear the current state of my Riverpod providers manually in my Flutter app? The use case I have is when a user signs out of my app then signs up as a new/different user the previous users ...
4
votes
3
answers
13k
views
ValueNotifier not updating the widget on updating the list
import 'package:flutter/material.dart';
import '../../Data/Globalvariable.dart' as global;
class MenuBar extends StatefulWidget {
final key = UniqueKey();
// final pin;
// MenuBar({this.pin='...
- 10.3k
0
votes
2
answers
53
views
+50
Flutter fixed component with scrollable widgets are all scrolling
I'm learning flutter and trying to implement a screen with a fixed component and the rest scrollable. The SingleChildScrollView class looks like what I want but I cannot get it to work. This is a ...
7
votes
2
answers
6k
views
Flutter folder picker
I have a button on screen, when you click button I need to open some folder picker.
I have searched for package, but I didn't found any package that also support Android and iOS.
Does someone knows ...
1
vote
1
answer
232
views
flutter : Your project requires a newer version of the Kotlin Gradle plugin
I am trying to build my app after some modification but I get error as shown below
.gradle/caches/transforms-3/431ce31617111116ed092b20fb775fda/transformed/jetified-kotlin-stdlib-1.9.0.jar!/META-INF/...
- 21
0
votes
1
answer
24
views
Flutter Open Specific page upon Notification Click
Iam using oneSignal and want to navigate to a specific page in my app when clicking on the recived notification
the problem the code can't find context
this probably from the fact that iam declaring ...
- 193
18
votes
5
answers
13k
views
Bottom navigation bar is reloading all the widgets each time I press a navigation item
The following code is almost a copy-paste from the official flutter GitHub example for the bottom navigation bar. The problem is, at the opening of the widget containing the views, everything is ...
0
votes
0
answers
18
views
kIsWasm always return false / How to compile for WebAssembly support?
Following the official Flutter Wasm documentation (https://docs.flutter.dev/platform-integration/web/wasm) I tried to compile my Flutter Web App for Wasm-support, but constant kIsWasm returns always ...
- 3,316
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votes
0
answers
27
views
type 'Null' is not a subtype of type 'String' with shared_preferences
import 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/localizations.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:shared_preferences/...
- 27
0
votes
2
answers
39
views
Title: TypeError in Flutter Test: Null is not a subtype of Future<String>
I'm writing a Flutter test where I'm trying to mock a method that calculates the BMI. Despite using when(...).thenReturn(...) to return a future value, I'm encountering the following error:
══╡ ...
- 1
0
votes
1
answer
22
views
Calling parent class methods using the implements keyword
Using extends and implements keyword in Dart. Trying to call methods of the base class from the child class using both extends and implements keyword.
void main() {
Dog d = Dog();
d.walking();
...
- 5,659
0
votes
0
answers
23
views
Why is the onClose Button Not Working on My Subscription Banner?
I'm creating a promotional banner for my customers to encourage subscription purchases. This banner includes a button at the top intended to close the banner. Despite multiple attempts and various ...
13
votes
7
answers
12k
views
stripe_android:compileReleaseJavaWithJavac'. error: invalid source release: 17
I am facing this issue while running my flutter project on VS code, after multiple attepmts still stuck here.
Anyone please help me to resolve this issue.
Even i have updated the java version by ...
- 98
2
votes
1
answer
536
views
How can I make a camera application using flutter desktop? [closed]
I want to make a custom camera application using the flutter desktop but unfortunately I'm not able to find any suitable plugin for that. Is there a way to make a custom plugin that would help me ...
- 1
6
votes
1
answer
849
views
Dart uuid can't be extended
I updated dependencies by dart pub upgrade, but here i thought due to some cache already there causing this error. i have tried dart clean cache but problem is still there. kindly take this issue ...
- 1
0
votes
0
answers
8
views
I want to send parameters to a GraphQL query from my flutter application
I want to send parameters to a GraphQL query from my flutter application, but it doesn't work. I declared a variable and write to it when I select by which criteria I am going to sort the query.
Query ...
0
votes
0
answers
15
views
How do I make Ffmpeg work for subtitles in flutter?
I'm trying to burn subtitles in a video. I'm going to show you the manual command I used:
String newCmd =
'-i /storage/emulated/0/ffmpeg/video.avi -vf subtitles=\'/storage/emulated/0/ffmpeg/...
- 20.3k
1
vote
0
answers
13
views
Dartfrog websocket broadcast message
i was digging inside of dart_frog to know it capabilities , it sounds awesome until i've started using websocket ,
i've implemented it like this way
final handler = webSocketHandler(
(channel, ...
- 7,891
10
votes
6
answers
10k
views
Alternative to popUntil in go router in flutter
I was wonder if there is alternative to Navigator's popUntil() method, or any workaround to achieve the same.
If i were to use Navigator. I would use like so:
void _logout() {
Navigator.popUntil(...
- 184
0
votes
1
answer
204
views
Flutter: Text to Speech - No Sound in İOS
I'm using flutter_tts package for text to speech. In android, everything is okay. It's works. But no sound in İOS. I don't know why. There is no error in console. It's very interesting i think. Here ...
- 306
-6
votes
0
answers
33
views
How to optimally allocate stocks to fulfill multiple requirements? [closed]
I'm trying to solve a problem where I have multiple stocks and requirements. Each requirement needs to be fulfilled by the available stocks. The goal is to minimize the remaining requirements while ...
- 1
-1
votes
2
answers
1k
views
Flutter AppBar leading and actions buttons should have the exact same size
the fist IconButton in leading and the second IconButton in actions. Have different sizes although i have explicitly specified the same sizes. (width: 56, height: 56)
this is how it looks
i want to ...
- 744
1
vote
1
answer
6k
views
How to embed a powerbi report within a flutter android application?
I'm creating an android application using flutter where I need to embed a powerbi report within the app itself. I could not find a single resource to aid me with this task. I've already created a web ...
0
votes
0
answers
16
views
How To Insert query in Flutter with PostgreSQL new package? postgres: ^3.2.1
How To Insert query in Flutter with PostgreSQL new package? postgres: ^3.2.1
all the other documentation are old, deprecated and not working anymore, could you someone please help on this..?
How to ...
1
vote
1
answer
546
views
Quran App a surah view like uthmanic quran 15 line how to make it like quran for android app
I want to make a full Islamic app but I have an issue I want to make the surah view like the "Quran for Android" application I can make it in qcf font but it is too long way.
I found an ...
- 2,392
4
votes
1
answer
1k
views
Is there any way to run a Flutter app through background on macOS or Windows desktop?
I want to make a clipboard application for macOS operating system. For this, the application I wrote with Flutter should continue to work in the background without dying. I've looked at a few ...
17
votes
13
answers
31k
views
'flutterfire configure' command not working, I need to set firebase in my flutter project
I followed "https://firebase.flutter.dev/docs/overview" instruction to set firebase in my flutter project.
step i took:
"flutter pub add firebase_core" then dependencies were ...
- 11
0
votes
1
answer
29
views
Riverpod - share data between providers
What's the canonical way to share data between two providers created with riverpod? In addition those two providers might only be very loosely connected logically speaking...
Let's assume we've got an ...
- 81
1
vote
3
answers
1k
views
Expanded widget not taking entire width or height
I was learning about Expanded widget in Flutter.
What I understand is that Expanded widget takes entire width/height depending or Row / Column.
So,this is the code I used for Row:
class DicePage ...
- 201
42
votes
3
answers
9k
views
Is it possible to make characters in Flutter to have the same width?
As you can see in the picture below, the texts have the same amount of characters, but since the number "1" is slimmer than the "5" and "2", both texts get a different ...
- 18.2k
1
vote
1
answer
24
views
Unable to pass required argument to parent class using super
After super method in the child class, I am unable to pass a parameter value to the parent class.
void main() {
MobilePhone mp = new MobilePhone(modelName: "7T", brandName: "...
- 30.5k