Flutter for Beginners

Stateful widgets in code

MyHomePage is a stateful widget, and so it is defined with a State object, _MyHomePageState, which contains properties that affect how the widget looks:

class MyHomePage extends statefulWidget {  MyHomePage({Key key, this.title}) : super(key: key);  final String title;  @override  _MyHomePageState createState() => _MyHomePageState();}

By extending statefulWidget, MyHomePage must return a valid State object in its createState() method. In our example, it returns an instance of _MyHomePageState.

Normally, stateful widgets define their corresponding State classes in the same file. Also, state is typically private to the widget library, as external clients do not need to interact with it directly.

The following _MyHomePageState ...