dart-null-safety Questions
11
Solved
I'm trying to create a "copyWith" method for my class, and it works with most scenarios.
The problem is when I try to set a nullable property to null, because my function cannot recognize...
Broeker asked 16/6, 2021 at 20:6
5
Solved
when running flutter pub run build_runner build I get this error.
Failed to build build_runner:build_runner:
../../snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/analyzer-0.41.2/lib...
Fellmonger asked 23/2, 2022 at 10:18
3
Solved
[INFO] Precompiling build script......
[WARNING] ../../flutter/.pub-cache/hosted/pub.dartlang.org/gql_code_builder-0.2.0/lib/src/ast.dart:618:12: Error: A non-null value must be returned since the ...
Damon asked 22/4, 2022 at 1:20
21
Solved
I want to achieve to make a drawer with different items on it, so I am creating a separate file for the DrawerItems and the with the constructor, pass the data to the main file. But I get the follo...
Lundy asked 22/10, 2020 at 14:11
4
I'm trying to create a Textbutton widget with a disabled property like this:
class AppTextButton extends StatelessWidget {
final String title;
final void Function(BuildContext context) onPress;
...
Warnock asked 31/8, 2021 at 8:12
5
Solved
Question
I am using AppLocalizations.of(context).myString to internationalize strings in my null safe flutter app.
My IDE tells me that AppLocalizations.of(context) can return null. What's the best...
Huai asked 10/1, 2021 at 19:13
5
Solved
Just started Flutter with native iOS background, so I just have a quick question about Dart beta null safety.
So in Swift, because they have the idea of null safety from the beginning just like Kot...
Blida asked 28/1, 2021 at 12:44
3
Solved
I am getting a "nullable expression" error. The problem is occurring in the following lines:
left: isSideBarOpenedAsync.data ? 0 : 0,
right: isSideBarOpenedAsync.data ? 0 : screenWidth - ...
Alabaster asked 28/5, 2021 at 13:52
3
Solved
I've been trying to debug this error type 'Null' is not a subtype of type 'String' in type cast but could not find the the exact place where the error is being produced besides that it is genereate...
Blodget asked 18/12, 2021 at 4:55
3
Solved
I'm in the process of migrating over a large project to null safety and I'm coming across a strange error I'm not entirely sure how to fix.
"Error: Type argument 'T' doesn't conform to the bou...
Ranjiv asked 18/4, 2021 at 6:44
5
Solved
Whenever I try to run a dart tool like Dart Migrate I get the following error and I am unable to run that tool. Is there a way to solve this problem or I have to reinstall Flutter?
Btw every thing...
Dejesus asked 13/4, 2021 at 12:0
17
Solved
I have followed "Enabling null safety" on dart.dev and also migrated my whole Flutter application to null safety.
Now, I am trying to run it using flutter run. However, it will not start ...
Nashbar asked 19/11, 2020 at 18:23
10
I have a null-safe library and in the example folder I'm using the following import:
import 'package:flutter/material.dart';
However, the linter is giving me the following warning:
The library 'p...
Grisons asked 29/1, 2021 at 5:0
4
I'm new to flutter and dart and I am trying to make a clone of instagram for studying purposes, but I am getting the error below.
Could you help me identify where the code is incorrect?
The output ...
Firenew asked 21/7, 2022 at 20:44
8
Solved
I tried to use null safety, but it's giving me this error:
This requires the 'non-nullable' language feature to be enabled. Try
updating your pubspec.yaml to set the minimum SDK constraint to 2.10...
Leavings asked 31/10, 2020 at 11:9
5
Solved
I don't know what is the problem is / how to fix this while I tring to code it shows this error on the test folder widget_test.dart
x
testWidgets('Counter increments smoke test', (WidgetTester tes...
Anguine asked 11/10, 2021 at 14:17
5
Solved
The property 'settings' can't be unconditionally accessed because the receiver can be 'null',
what to do
my code :
class DressDetailsScreen extends StatelessWidget {
static const routeName = '/Dre...
Farrow asked 23/5, 2021 at 12:20
3
Solved
I am trying to migrate a project into null safety mode,after migrating and clearing all the errors, I am getting this problem named 'Sort pub dependencies.dart(sort_pub_dependencies)'. I searched G...
Ginglymus asked 9/3, 2021 at 10:58
8
Solved
Dart function
I have the following Dart function and I am now using null safety:
void calculate({int factor}) {
// ...
}
The analyzer complains that:
The parameter 'factor' can't have a value of...
Radborne asked 27/10, 2020 at 18:9
3
Solved
i'm new at dart. I don't know what kind of mistake i have made, but this code didn't work.
Is a simple code, just read the age in terminal and say it's underage or over 18.
import 'dart:io';
main...
Caren asked 18/3, 2021 at 16:40
4
Solved
I changed my SDK version for flutter to min , so that I can fix my code for null safety.
There is one issue that I don't understand,
this line produces the following error:
The argument type 'Color...
Attorneyatlaw asked 19/3, 2021 at 10:11
4
I'm new to Flutter. I am trying to develop an application.
I want to show the staff list in the Firebase database. However, I am getting the following error.
Error :
The method '[]' can't be uncon...
Gruchot asked 17/5, 2021 at 19:25
5
Solved
After the release of Flutter 2, I've migrated my code to sdk: '>=2.12.0 <3.0.0' and all codes are "sound null safety" now. But I encountered errors in unit tests with mockito 5.0.0
...
Master asked 11/3, 2021 at 12:40
2
Suppose there are two models User and City
@JsonSerializable()
class User {
int id;
String name;
City? city;
List<Map<String, City>>? listMapCity;
}
@JsonSerializable()
class City...
Milissa asked 23/5, 2021 at 10:2
3
Im trying to migrate dart null safety but I get the following error when I run dart migrate
Bad state: Error: package has unmigrated dependencies.
Before migrating your package, we recommend ensur...
Suspense asked 6/10, 2021 at 17:48
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