I want that the FloatingActionButtons, TextButtons and IconButtons will be visually consistent, thus look the same in means of size, shape and color, using a theme in Flutter. how can I achieve that?
For defining a theme, MaterialApp has a property named theme. There you have to provide the instance of ThemeData.
MaterialApp(
title: title,
theme: ThemeData(
brightness: Brightness.light,
)
);
For "FloatingActionButton", "IconButton" and "TextButton" to look like same you have to define the theme (all the properties which you want to be consistent) for all of them such as.
For IconButton
iconTheme: IconThemeData(
color: Colors.red,
),
For FloatingActionButton
floatingActionButtonTheme: FloatingActionButtonThemeData(
foregroundColor: Colors.red,
),
For TextButton
textButtonTheme: TextButtonThemeData(
style: TextButton.styleFrom(
primary: Colors.red,
),
),
My Suggestion:
Use the primarySwatch property for the consistent color scheme.
primarySwatch: Colors.red;
In flutter even when I set
primaryColor: Colors.orange,
then in some part of the UI the default Colors.blue is still present.
Is there a way how to globally override it for the ThemeData?
In order for me to override Colors.blue, I had to state primarySwatch in the ThemeData and also the colorScheme, as in
theme: ThemeData(
primarySwatch: Colors.orange,
colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.orange),
),
Try:
primarySwatch: Colors.orange
In Flutter we can write our ThemeData in two ways,
1: As variable
2: As a method
final lightThemeData = ThemeData(
brightness: Brightness.light,
primaryColor: primaryColor,
textTheme: GoogleFonts.poppinsTextTheme(
ThemeData.light().textTheme,
),
elevatedButtonTheme: elevatedButtonThemeData,
colorScheme: ThemeData.light()
.colorScheme
.copyWith(secondary: secondaryColorLightTheme),
);
ThemeData buildThemeData(BuildContext context) {
return ThemeData(
brightness: Brightness.light,
primaryColor: primaryColor,
textTheme: GoogleFonts.poppinsTextTheme(
Theme.of(context).textTheme,
),
elevatedButtonTheme: elevatedButtonThemeData,
colorScheme: Theme.of(context)
.colorScheme
.copyWith(secondary: secondaryColorLightTheme),
);
}
Check the image for more clear explanation
There is no better way here since the two snippets have different behaviors:
In the first one, the theme is independent from where it's used.
In the second snippet, the theme inherits from the ambient theme because of the Theme.of(context).
But the context variant is significantly better
Because with the "create a new theme" variant, there's no single source of truth for the theme. Theming is all over the place
In my MaterialApp widget, I'm using the theme property to set the universal theme for my app. I want to set a blue color for the text in the AppBar, and red color for text in the Scaffold body. But using textTheme in ThemeData, only the Scaffold's text has the intended color, not the AppBar text.
This is the code for the theme I'm using in MaterialApp:
theme: ThemeData(
primaryColor: Color(0xFF0A0E21), //a navy bluish color
scaffoldBackgroundColor: Color(0xFF0A0E21),
accentColor: Colors.purple,
textTheme: TextTheme(
headline6: TextStyle(
color: Colors.blue
),
bodyText2: TextStyle(
color: Colors.red
)
)
The AppBar text remains white, but text in the body of the app (in the Scaffold I'm using) changes to red. I'm not setting different colors anywhere else.
you have to use appBarTheme on themeData
ThemeData(
scaffoldBackgroundColor: Color(0xFF0A0E21),,
appBarTheme: AppBarTheme(
color: Colors.blue,
),
I tried changing the color of all my RaisedButtons from the themeData but it refused to work. All other properties, such as fontSize and fontWeight changed successfully. The color of the text only changes from black to white when the brightness property of themeData is changed to Brightness.dark.
Is there a way I can solve this issue? What could I be doing wrong?
Here is my sample code:
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primaryColor: Color(0XFF212845),
scaffoldBackgroundColor: Color(0XFF212845),
primarySwatch: Colors.yellow,
buttonColor: Color(0XFFF8D320),
textTheme: TextTheme(
button: TextStyle(
color: Colors.green, // This is not working.
fontSize: 30.0,
fontWeight: FontWeight.bold
)
)
),
home:MenuPage(),
);
For other people coming to this question, one reason that a button may not change colors is that it is disabled, which happens when you don't have the onPressed method set.
RaisedButton(
color: Theme.of(context).accentColor,
onPressed: () {}, // <-- need to add this
child: Text(...),
),
if you are giving a color to the color property and it doesn't show ,then probably you haven't implemented the onPressed property, because in this state the button will show it's disabled color , which is no color at all.
set it like this:
onPressed: () {},
giving it an anonymous function like that while not implementing anythig ( or something if you wish) will give it color
Add buttonTheme and accentColor to your ThemeData , like this:
ThemeData(
primaryColor: Color(0XFF212845),
scaffoldBackgroundColor: Color(0XFF212845),
primarySwatch: Colors.yellow,
buttonColor: Color(0XFFF8D320),
buttonTheme: ButtonThemeData(textTheme: ButtonTextTheme.accent),
accentColor: Colors.green,
Even though primarySwatch might have been added, you still need to add buttonColor to add the color to the buttons, like this:
child: MaterialApp(
home: Wrapper(),
theme: ThemeData(
primarySwatch: Colors.blue,
buttonColor: Colors.blue // this is needed
),
),
primarySwatch - used to configure default values for several fields,
including: primaryColor, primaryColorBrightness, primaryColorLight,
primaryColorDark, toggleableActiveColor, accentColor, colorScheme,
secondaryHeaderColor, textSelectionColor, backgroundColor, and
buttonColor.
Also, make sure onPressed in your RaisedButton is set:
onPressed: () {},
Make sure you haven't customize the RaisedButton() itself, else it will override the ThemeData. If you have customized color property in RaisedButton it will override the properties set in ThemeData.
I believe the correct way is to declare a buttonColor property in your ThemeData Widget.
MaterialApp(
theme: ThemeData(
fontFamily: 'Pirata',
primaryColor: Color.fromRGBO(71, 86, 87, 1),
accentColor: Color.fromRGBO(71, 86, 87, 1),
buttonColor: Color.fromRGBO(238, 238, 238, 1),
),
home: App()))