Themes (Styles)

Domains: Flutter

How do I theme my app?

Flutter comes with a beautiful, built-in implementation of Material Design, which handles much of the styling and theming needs that you would typically do.

Xamarin.Forms does have a global ResourceDictionary where you can share styles across your app. Alternatively, there is Theme support currently in preview.

In Flutter you declare themes in the top level widget.

To take full advantage of Material Components in your app, you can declare a top level widget MaterialApp as the entry point to your application. MaterialApp is a convenience widget that wraps a number of widgets that are commonly required for applications implementing Material Design. It builds upon a WidgetsApp by adding Material-specific functionality.

You can also use a WidgetApp as your app widget, which provides some of the same functionality, but is not as rich as MaterialApp.

To customize the colors and styles of any child components, pass a ThemeData object to the MaterialApp widget. For example, in the following code, the primary swatch is set to blue and text selection color is red.

class SampleApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Sample App',
      theme: new ThemeData(
      home: new SampleAppPage(),

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