Flutter for Beginners

Stateless widget in code

Let's start by looking at stateless widgets in code. The very first stateless widget in the application is the application class itself:

class MyApp extends statelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(      title: 'Flutter Demo',      theme: ThemeData(            primarySwatch: Colors.blue,      ),      home: MyHomePage(title: 'Flutter Demo Home Page'),    );  }}

As you can see, the MyApp class extends statelessWidget and overrides the build(BuildContext) method. This method describes a UI part; that is, it builds the widgets subtree below it. In the preceding case, MyApp is the root of the widget tree and, therefore, it builds all the widgets down the tree. In this case, its direct child is MaterialApp. According ...