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@override
Widget build(BuildContext context) {
const appName = 'Custom Themes';
return MaterialApp(
title: appName,
theme: ThemeData(
useMaterial3: true,
// Define the default brightness and colors.
colorScheme: ColorScheme.fromSeed(
seedColor: Colors.purple,
// TRY THIS: Change to "Brightness.light"
// and see that all colors change
// to better contrast a light background.
brightness: Brightness.dark,
),
// Define the default `TextTheme`. Use this to specify the default
// text styling for headlines, titles, bodies of text, and more.
textTheme: TextTheme(
displayLarge: const TextStyle(
fontSize: 72,
fontWeight: FontWeight.bold,
),
// TRY THIS: Change one of the GoogleFonts
// to "lato", "poppins", or "lora".
// The title uses "titleLarge"
// and the middle text uses "bodyMedium".
titleLarge: GoogleFonts.oswald(
fontSize: 30,
fontStyle: FontStyle.italic,
),
bodyMedium: GoogleFonts.merriweather(),
displaySmall: GoogleFonts.pacifico(),
),
),
home: const MyHomePage(
title: appName,
),
);
}
}
class MyHomePage extends StatelessWidget {
final String title;
const MyHomePage({super.key, required this.title});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(title,
style: Theme.of(context).textTheme.titleLarge!.copyWith(
color: Theme.of(context).colorScheme.onSecondary,
)),
backgroundColor: Theme.of(context).colorScheme.secondary,
),
body: Center(
child: Container(
padding: const EdgeInsets.symmetric(
horizontal: 12,
vertical: 12,
),
color: Theme.of(context).colorScheme.primary,
child: Text(
'Text with a background color',
// TRY THIS: Change the Text value
// or change the Theme.of(context).textTheme
// to "displayLarge" or "displaySmall".
style: Theme.of(context).textTheme.bodyMedium!.copyWith(
color: Theme.of(context).colorScheme.onPrimary,
),
),
),
),
floatingActionButton: Theme(
data: Theme.of(context).copyWith(
// TRY THIS: Change the seedColor to "Colors.red" or
// "Colors.blue".
colorScheme: ColorScheme.fromSeed(
seedColor: Colors.pink,
brightness: Brightness.dark,
),
),
child: FloatingActionButton(
onPressed: () {},
child: const Icon(Icons.add),
),
),
);
}
}<code_end>
<topic_end>
<topic_start>Material Design for Flutter
Material Design is an open-source design system built
and supported by Google designers and developers.The latest version, Material 3, enables personal,
adaptive, and expressive experiences—from dynamic color
and enhanced accessibility, to foundations for
large screen layouts, and design tokens.warning Warning
As of the Flutter 3.16 release, Material 3 is
enabled by default. For now, you can opt out
of Material 3 by setting the useMaterial3 property
to false. But be aware that the useMaterial3
property and support for Material 2