Issue I upgraded my project to null-safety as they describe here dart migrate. I applied all suggestions but I get an error on one of my screens. How can I fix this? Future<bool> systemBackButtonPressed() { if (navigatorKeys[profileController.selectedIndex.value]! .currentState! .canPop()) {
Continue readingTag: null-safety
The body might complete normally, causing 'null' to be returned, but the return type, 'Future<bool>', is a potentially non-nullable type
Issue I upgraded my project to null-safety as they describe here dart migrate. I applied all suggestions but I get an error on one of my screens. How can I fix this? Future<bool> systemBackButtonPressed() { if (navigatorKeys[profileController.selectedIndex.value]! .currentState! .canPop()) {
Continue readingUnhandled Exception: Looking up a deactivated widget's ancestor is unsafe Navigator.push after migration to null safety
Issue I have migrated all my packages of the project to null safety. Due to some thinks that I have to handle on the Android (Kotlin), extending a third party library. After doing that now I receive the following error:
Continue readingThe argument type 'List<Slots?>?' can't be assigned to the parameter type 'List<Slots>?'
Issue i have recently migrated my code to null safety. got the below error in dart migrate command. The argument type ‘List<Slots?>?’ can’t be assigned to the parameter type ‘List?’ at lib/responsemodels/appointment/calendar/calendar_response.g.dart:17:5 Highlighted the error throwing line below calendar_response.dart //
Continue readingHow not to print a null value received from sqflite database?
Issue I’m making a "Recipes app" to learn. I have this problem now: I’m working with Sqflite and I have a page where I show the ingredients from the recipe, the sql query is OK, but the problem is that
Continue readingHow to initialize Either Right to an empty value in flutter
Issue I recently made the switch to null-safety in my flutter project, which brings a new kind of problem when using the Either type (from the dartz package) For example, before I would have some properties in my class like
Continue readingDart/Flutter widget with optional parameters but at least one required
Issue I’m trying to create a Flutter widget that can be initialized by various parameters, something like this class MyWidget extends StatefulWidget { final int? id; final String? username; MyWidget({this.id, this.username}); @override _MyWidgetState createState() => _MyWidgetState(); } class _MyWidgetState extends
Continue readingNull-aware .firstWhere, .singleWhere, .lastWhere in Dart's List?
Issue I often use .firstWhere((E element) -> bool) -> E in my project. When porting it to support null safety I couldn’t cleanly handle a scenario when an element is not found in a List instance. .firstWhere, .singleWhere and .lastWhere
Continue readingError: The parameter 'onSubmit' can't have a value
Issue Hi I have created a default form field, in a separate dart file called components, and I have login_screen.dart also. there are many errors I don’t know how to fix it, and make the code work, I will put
Continue readingThe argument type 'TextStyle?' can't be assigned to the parameter type 'TextStyle'
Issue I am getting this error… code snippet that is throwing this error: catalog.desc.text.textStyle(context.captionStyle).make(), Solution Your object context.captionStyle has the TextStyle? type, which means it can be null. The .textStyle() function only accepts TextStyle objects, hence the error. You either
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