Flutter How to force Dark mode on specific screens - flutter

Question

I'm building a news app using flutter, the app has 2 theme modes already dark and light debends on phone settings and works really great, but I need on some screens on my app to be dark whatever such as videos section or video page ...etc
I googled this and all the results about the normal theming which I did already.
I don't think there's any code I can put here to help, but if there please let me know!

Answer 1

You can override the current theme at any time simply by placing the desired widget in a Theme class.
I don't know if you are using Scaffold or not, but let's say you are then all you would need to do is:
// declare theme data if you don't have it already
final ThemeData specialThemeData = ThemeData(
brightness: Brightness.dark,
primaryColor: Colors.yellow[700],
// and so on...
);
#override
Widget build(BuildContext context) {
// this the point of interest, return a Theme with desired Theme Data
return Theme(
data: specialThemeData,
child: Scaffold(
//...
It doesn't have to be Scaffold, it will work on any widegt.
Here is a fully functional example you can try out yourself:
import 'package:flutter/material.dart';
final ThemeData specialThemeData = ThemeData(
brightness: Brightness.dark,
primaryColor: Colors.yellow[700],
accentColor: Colors.orange[500],
textTheme: TextTheme(
headline1: TextStyle(fontSize: 48.0, fontWeight: FontWeight.bold),
headline6: TextStyle(fontSize: 24.0, fontStyle: FontStyle.italic),
bodyText2: TextStyle(fontSize: 18.0),
),
);
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Home Page default theme'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
void _goToSpecialPage() {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => MySpecialPage()
)
);
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Your homepage, using default theme.',),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _goToSpecialPage,
tooltip: 'Go to special page',
child: Icon(Icons.navigate_next),
),
);
}
}
class MySpecialPage extends StatefulWidget {
MySpecialPage({Key key}) : super(key: key);
#override
_MySpecialPageState createState() => _MySpecialPageState();
}
class _MySpecialPageState extends State<MySpecialPage> {
void _backToHomePage(){
Navigator.pop(context);
}
#override
Widget build(BuildContext context) {
// this the point of interest, return a Theme with desired Theme Data
return Theme(
data: specialThemeData,
child: Scaffold(
appBar: AppBar(
title: Text('Special theme page'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Your special page that uses a different theme.',),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _backToHomePage,
tooltip: 'Go back to home page',
child: Icon(Icons.navigate_before),
),
),
);
}
}