I am trying to create three radio buttons using the "RadioListTile" widget. How to change the background color of the selected tile? I want the selected radio tile to be gray and the others to be white. How to achieve…
I'm writing a Material app and want to use the predefined text theme styles as much as possible rather than re-inventing typical theme elements from scratch. So to set the text a little bigger I do this Text('foo', style: Theme.of(context).textTheme.bodyLarge);…
I'm attempting to access a JSON response from a server so I can output the contents on the screen, but I keep getting the error message: Unhandled Exception: type 'List' is not a subtype of type 'Map<String, dynamic>' in type…
Found out a strange problem when I was creating a rotation animation for an Icon. I use RotationTransition to animate Icons.sync. And I also use Transform because I need a mirrored version of the icon. The results is strange -…
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…