StatefulWidget Explained | Flutter for Android Developers

What’s StatefulWidget?

A widget that has mutable state. State is information that can be read synchronously when the widget is built and might change during the lifetime of the widget.

Check the official documentation for more.

StatefulWidget explained for Android Developers

Stateful widgets are useful when the part of the user interface you are describing can change dynamically, e.g. due to having an internal clock-driven state, or depending on some system state. This is similar to how Android/Kotlin handles UI updates with LiveData and ViewModel, where the UI can react to changes in data over time.

Example Code

Here is an example of how to use StatefulWidget:

class YellowBird extends StatefulWidget {
  const YellowBird({super.key});
  @override
  State createState() => _YellowBirdState();
}

class _YellowBirdState extends State {
  @override
  Widget build(BuildContext context) {
    return Container(color: const Color(0xFFFFE306));
  }
}