Flutter provides a great feature Theme to control UI. This allows developers to improve this design and also manage different custom themes (like dark). A theme describes the colors and typographic choices of an application. To know more about the theme please check flutter doc.
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Before start let discuss some concept in Theme.
ThemeData class defines the configuration of the overall visual Theme for a MaterialApp or a widget subtree within the app.
The static Theme.of method finds the ThemeData value specified for the nearest BuildContext ancestor. This lookup is inexpensive, essentially just single HashMap access.
After defining a Theme, use it within your own widgets. Flutter’s Material widgets also use your Theme to set the background colors and font styles for AppBars, Buttons, Checkboxes, and more.
In this blog, I will implement a custom theme for both dark and light and also use common font for all widgets.
Let’s start.
First, create a Theme class and add color according to what you want in your app.
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class AppTheme { AppTheme._(); static Color _iconColor = Colors.blueAccent.shade200; static const Color _lightPrimaryColor = Color(0xFF546E7A); static const Color _lightPrimaryVariantColor = Color(0xFF546E7A); static const Color _lightSecondaryColor = Colors.green; static const Color _lightOnPrimaryColor = Colors.black; static const Color _darkPrimaryColor = Colors.white24; static const Color _darkPrimaryVariantColor = Colors.black; static const Color _darkSecondaryColor = Colors.white; static const Color _darkOnPrimaryColor = Colors.white; static final ThemeData lightTheme = ThemeData( appBarTheme: AppBarTheme( titleTextStyle: TextStyle(color:_darkSecondaryColor,fontFamily: "Roboto",fontWeight: FontWeight.bold,fontSize: 26 ), color: _lightPrimaryVariantColor, iconTheme: IconThemeData(color: _lightOnPrimaryColor), ), colorScheme: ColorScheme.light( primary: _lightPrimaryColor, primaryVariant: _lightPrimaryVariantColor, secondary: _lightSecondaryColor, onPrimary: _lightOnPrimaryColor, ), iconTheme: IconThemeData( color: _iconColor, ), textTheme: _lightTextTheme, dividerTheme: DividerThemeData( color: Colors.black12 ) ); static final ThemeData darkTheme = ThemeData( scaffoldBackgroundColor: _darkPrimaryVariantColor, appBarTheme: AppBarTheme( color: _darkPrimaryVariantColor, iconTheme: IconThemeData(color: _darkOnPrimaryColor), ), colorScheme: ColorScheme.dark( primary: _darkPrimaryColor, primaryVariant: _darkPrimaryVariantColor, secondary: _darkSecondaryColor, onPrimary: _darkOnPrimaryColor, background: Colors.white12, ), iconTheme: IconThemeData( color: _iconColor, ), textTheme: _darkTextTheme, dividerTheme: DividerThemeData( color: Colors.black ) ); static final TextTheme _lightTextTheme = TextTheme( headline1: _lightScreenHeading1TextStyle, ); static final TextTheme _darkTextTheme = TextTheme( headline1: _darkScreenHeading1TextStyle, ); static final TextStyle _lightScreenHeading1TextStyle = TextStyle(fontSize: 26.0,fontWeight:FontWeight.bold, color: _lightOnPrimaryColor,fontFamily: "Roboto"); static final TextStyle _darkScreenHeading1TextStyle = _lightScreenHeading1TextStyle.copyWith(color: _darkOnPrimaryColor); } |
Now call the Theme element.
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Theme.of(context).textTheme.headline1 Theme.of(context).colorScheme.background |
I hope this code will help you better to understand Custom Theme in flutter. If you feel any doubt or query please comment below.
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2 comments
MaterialApp(title: ‘Flutter Demo’,
theme: AppTheme.lightTheme,
darkTheme: AppTheme.darkTheme,)
Thanks