This code Future<List<String>> readHeaderData() async { List<String> l = new List(); List<String> files = await readHeaders(); // Gets filenames files.forEach((filename) async { final file = await File(filename); String contents = await file.readAsString(); User user = User.fromJson(json.decode(contents)); String name = user.NameLast + “, ” + user.NameFirst; print(name); l.add(name); } return l; } returns the list l … Read more
There is an easy way to create and run a Dart console application: Open VSCode Press cmd + shift + p on Mac or ctrl + shift + p on windows. Choose Dart: New project 4.Then you should select Console Application 5.After locating console application everything is ready for you 😊 Well, how to run … Read more
Declare your Color: const primaryColor = Color(0xFF151026); In the MaterialApp level (will change the AppBar Color in the whole app ) change primaryColor return MaterialApp( title: ‘Flutter Demo’, theme: ThemeData( primaryColor: primaryColor, ), home: MyApp(), ); and if you want to change it on the Widget level modify the backgroundColor appBar: AppBar( backgroundColor: primaryColor, ),
You need to add three additional steps: First, you need to convert the JSON map to a String (using json.encode) Then you need to Uri encode it if you want to send it as application/x-www-form-urlencoded. Lastly, you need to give the parameter that you are posting a name. For example (note, this is using the … Read more
If you want to collapse a widget to zero height or zero width that has a child that overflow when collapsed, I would recommend SizeTransition or ScaleTransition. Here is an example of the ScaleTransition widget being used to collapse the container for the four black buttons and status text. My ExpandedSection widget is used with … Read more
In my case i had code like this (in class state) final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>(); void showInSnackBar(String value) { _scaffoldKey.currentState.showSnackBar(new SnackBar(content: new Text(value))); } but i didn’t setup the key for scaffold. so when i add key: _scaffoldKey @override Widget build(BuildContext context) { return new Scaffold( key: _scaffoldKey, body: new SafeArea( snackbar start … Read more
The quiver package provides helper functions hash2, hash3, etc., which simplify the task of implementing hashCode, with some assurance that it works properly under the Dart VM and when compiled to JavaScript. import ‘package:quiver/core.dart’; class Person { String name; int age; Person(this.name, this.age); bool operator ==(o) => o is Person && name == o.name && … Read more
The easiest way I know of is to use Iterable.expand() with an identity function. expand() takes each element of an Iterable, performs a function on it that returns an iterable (the “expand” part), and then concatenates the results. In other languages it may be known as flatMap. So by using an identity function, expand will … Read more
To get access to index, you need to convert your list to a map using the asMap operator. Example final fruitList = [‘apple’, ‘orange’, ‘mango’]; final fruitMap = fruitList.asMap(); // {0: ‘apple’, 1: ‘orange’, 2: ‘mango’} // To access ‘orange’ use the index 1. final myFruit = fruitMap[1] // ‘orange’ // To convert back to … Read more
Flutter locales explained First of all, you should understand the difference between system settings and your application settings: System settings – what the system provides to your app as user preferences for your information. Application settings – what you decided (explicitly or implicitly) to be the application locale. You may allow your users to select … Read more