Im using the Class PageController to navigate between pages in the app, it was working when i set it up for the first time, so then it stoped to work This is the base screen, were the pagecontroller is called:…
I'm trying to get my head around how I should manage reading data from a database in Flutter (or any API/backend). Without a database and just using state that's local to the widget I'd expect to write something similar to…
Prelude I'm familiar with the dictum "Constraints go down. Sizes go up. Parent sets position.' What I'd like to understand is how "constraints" are defined. Is it just a range ("height must be between 30 and infinity"), or is there…
How can we make this kind of list behavior? As input parameters we have index of the element to be fixed (can be found in advance if necessary) list of items I can imagine a way to fix the element…
Error: E/flutter (28049): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: 'package:object_mapper/src/mappable.dart': Failed assertion: line 8 pos 12: 'constructor != null': RegistrationResponse is not defined in Reflection.factories E/flutter (28049): #0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:51:61) E/flutter (28049): #1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:40:5) E/flutter (28049): #2 new Mappable (package:object_mapper/src/mappable.dart:8:12) E/flutter (28049):…
This happens after fetching data from an api. The request executes successfully and i get a json response of departments but I can't process the response. Uncaught (in promise) Error: Expected a value of type 'String', but got one of…
Currently I'm creating a user registration criteria and it have three registration pages. For each completion of user registration page I want to store it in local storage. If the user closes the app before the 3 level of registration,…
Coming from Swift this works well in Swift - class Test { let userId: Int? let id: Int? let title: String? init(userId: Int, id: Int, title: String) { self.id = id self.title = title self.userId = userId } } Now…
In my Flutter project I want to initialise BLoC (Provider/Cubit) once API responds with definition of shape of the state required for entire app. Consider following shapes shape-1 { arr1: [], arr2: [], selected: false } shape-2 { arr1: [],…
I have an error inside my project total += double.parse(value.price!) * value.quantity; in this line, the error occurs The argument type 'int?' can't be assigned to the parameter type 'num'. cart_provider.dart import 'package:flutter/foundation.dart'; import 'package:myproject/model/CartModel.dart'; class Cart with ChangeNotifier {…