Flutter AppBar Basics with title, actions and PopupMenuButton

In this example, we are going to see how to create a typical AppBar with a title, actions, and an overflow dropdown menu.

Here is how the final output is going to look like.

This app displays one of a half dozen choices with an icon and a title. The two most common choices are available as action buttons and the remaining choices are included in the overflow dropdown menu.

Try this app out by creating a new project with flutter create and replacing the contents of lib/main.dart with the code below and run it.

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
  Choice _selectedChoice = choices[0];
  @override
  Widget build(BuildContext context) {
    var title = "AppBar demo";
    return MaterialApp(
      title: title,
      home: Scaffold(
        appBar: AppBar(
          title: Text(title),
          actions: <Widget>[
            IconButton(
              icon: Icon(choices[0].icon),
              onPressed: () {
                _select(choices[0]);
              },
            ),
            IconButton(
              icon: Icon(choices[1].icon),
              onPressed: () {
                _select(choices[1]);
              },
            ),
            PopupMenuButton<Choice>(
              onSelected: _select,
              itemBuilder: (BuildContext context) {
              return choices.skip(2).map((Choice choice) {
                return PopupMenuItem<Choice>(
                  value: choice,
                  child: Text(choice.title)
                  );
                }).toList();
              },
            ),
          ],
        ),
        body: ChoiceCard(choice: _selectedChoice),
      ),
    );
  }
  void _select(Choice choice) {
    setState(() {
      _selectedChoice = choice;
    });
  }
}
class ChoiceCard extends StatelessWidget {
  final Choice choice;
  const ChoiceCard({Key key, this.choice}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    var textStyle = Theme.of(context).textTheme.display1;
    return Padding(
      padding: const EdgeInsets.all(0.0),
      child: Card(
        child: Center(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              Icon(
                choice.icon,
                size: 128.0,
              ),
              Text(choice.title, style: textStyle)
            ],
          ),
        ),
      ),
    );
  }
}
class Choice {
  const Choice({this.title, this.icon});
  final String title;
  final IconData icon;
}
const List<Choice> choices = const <Choice>[
  const Choice(title: 'Car', icon: Icons.directions_car),
  const Choice(title: 'Bicycle', icon: Icons.directions_bike),
  const Choice(title: 'Boat', icon: Icons.directions_boat),
  const Choice(title: 'Bus', icon: Icons.directions_bus),
  const Choice(title: 'Train', icon: Icons.directions_railway),
  const Choice(title: 'Walk', icon: Icons.directions_walk),
];

Thanks,

Srikanth

Flutter AppBar Basics with title, actions and PopupMenuButton

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