Flutter : Change accent color on runtime

Question

How to change accent color on runtime in flutter?

Color scolor = Colors.green;
...
...
new MaterialApp(

      theme: new ThemeData(
        brightness: Brightness.light,
        accentColor:  scolor,
        ),
 home: new SetAccentColor());


class SetAccentColor extends StatefulWidget {
  @override
  _SetAccentColor createState() => _SetAccentColor();
}

class _SetAccentColor extends State<SetAccentColor > {
...
...
@override
  Widget build(BuildContext context) {
 return Scaffold(
        body: Builder(
            builder: (context) => Container(
                  child: FutureBuilder<List<ColorDBModel>>(
                          future: ColorDBProvider.db.getAllColorModels(),
                          builder: (BuildContext context, AsyncSnapshot<List<ColorDBModel>> snapshot) {

 if (snapshot.data[0].ColorName == "red")
scolor = Colors.red;
else 
scolor = Colors.blue;
...
...
...
}
}
}

These are the important parts of the code. But accentColor isnt changing according to the changes in scolor.

can you add the full code, which simulates your problem?

Viren V Varasadiya
– Viren V Varasadiya

2020-02-18 13:48:23 +00:00
Commented Feb 18, 2020 at 13:48 — Viren V Varasadiya
– Viren V Varasadiya, Commented Feb 18, 2020 at 13:48
updated and simplified

legacyO7
– legacyO7

2020-02-18 14:09:30 +00:00
Commented Feb 18, 2020 at 14:09 — legacyO7
– legacyO7, Commented Feb 18, 2020 at 14:09

Viren V Varasadiya · Accepted Answer · 2020-02-18 15:29:17Z

2

you can do using provider package easily.

Make sure you add package in pubspec.yaml file.

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class ThemeChange extends ChangeNotifier {
  Color accentColor = Colors.green;
  void changeColor(Color color) {
    this.accentColor = color;
    notifyListeners();
  }
}

void main() {
  // for bloc transition trace
  //BlocSupervisor.delegate = SimpleBlocDelegate();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider<ThemeChange>(
      create: (context) => ThemeChange(),
      child: Consumer<ThemeChange>(builder: (context, themechange, child) {
        return MaterialApp(
          title: 'Flutter Demo',
          theme: ThemeData(accentColor: themechange.accentColor),
          initialRoute: '/',
          home: Scaffold(body: HomeWidget()),
        );
      }),
    );
  }
}

class HomeWidget extends StatelessWidget {
  const HomeWidget({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: Center(
          child: RaisedButton(
            onPressed: () {
              Provider.of<ThemeChange>(context, listen: false)
                  .changeColor(Colors.teal);
            },
            child: Text("change accent color"),
            color: Provider.of<ThemeChange>(context).accentColor,
          ),
        ),
      ),
    );
  }
}

answered Feb 18, 2020 at 15:29

Viren V Varasadiya

27.4k9 gold badges49 silver badges69 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Viren V Varasadiya Over a year ago

you can do the same way as i showed to change themedata. you have to use consumer over appbar insted of current location.

Viren V Varasadiya Over a year ago

@legacyO7 Accept the answer if you get what you was expecting.

Viren V Varasadiya Over a year ago

Accept the answer if it woks for you.

Alexandre · Accepted Answer · 2020-02-18 13:52:22Z

0

Use the setState to rebuild the widget with the new color. This will work with a StatefulWidget.

onPressed: () {
  setState(() {
    scolor = Colors.red;
  });
}

answered Feb 18, 2020 at 13:52

Alexandre

1523 silver badges10 bronze badges

4 Comments

legacyO7 Over a year ago

there is no onPressed here and cant use setState as well

Alexandre Over a year ago

Why can't you use setState?

legacyO7 Over a year ago

using setState didnt changed accent color

Alexandre Over a year ago

The setState will change the state of the SetAccentColor class, not the application. I can't test this now, but it is a nice question and I'll have the same problem with the theme and language changes with an app I'm building...

Collectives™ on Stack Overflow

Flutter : Change accent color on runtime

2 Answers 2

3 Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related