Flutter 为什么在更改应用程序的主题时生成函数会出错?
我的主要文件如下Flutter 为什么在更改应用程序的主题时生成函数会出错?,flutter,flutter-theme,Flutter,Flutter Theme,我的主要文件如下 import 'package:flutter/material.dart'; import 'package:ajanda/screens/mainmenu.dart'; Future<void> main() async{ runApp(MaterialApp( debugShowCheckedModeBanner: false, title: "Takvim", home: MainMenu())); } import '
import 'package:flutter/material.dart';
import 'package:ajanda/screens/mainmenu.dart';
Future<void> main() async{
runApp(MaterialApp(
debugShowCheckedModeBanner: false, title: "Takvim", home: MainMenu()));
}
import 'package:ajanda/blocs/theme.dart';
import 'package:provider/provider.dart';
//const String testDevice = 'Mobile_id';
class MainMenu extends StatelessWidget {
MainMenu({Key key}) : super(key: key);
@override
Widget build(BuildContext context) {
return ChangeNotifierProvider<ThemeChanger>(
builder: (_) => ThemeChanger(ThemeData.dark()),
child: new MaterialAppWithTheme(),
);
}
}
class MaterialAppWithTheme extends StatelessWidget{
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MainMenuBody(),
);
}
}
class MainMenuBody extends StatefulWidget {
@override
_MainMenuBodyState createState() => _MainMenuBodyState();
}
class _MainMenuBodyState extends State<MainMenuBody> {
....
}
您需要遵循这些步骤
import 'package:flutter/material.dart';
final darkTheme = ThemeData(
primarySwatch: Colors.grey,
primaryColor: Colors.black,
brightness: Brightness.dark,
backgroundColor: const Color(0xFF212121),
accentColor: Colors.white,
accentIconTheme: IconThemeData(color: Colors.black),
dividerColor: Colors.black12,
);
final lightTheme = ThemeData(
primarySwatch: Colors.grey,
primaryColor: Colors.white,
brightness: Brightness.light,
backgroundColor: const Color(0xFFE5E5E5),
accentColor: Colors.black,
accentIconTheme: IconThemeData(color: Colors.white),
dividerColor: Colors.white54,
);
提供者类
import 'package:flutter/material.dart';
class ThemeNotifier with ChangeNotifier {
ThemeData _themeData;
ThemeNotifier(this._themeData);
getTheme() => _themeData;
setTheme(ThemeData themeData) async {
_themeData = themeData;
notifyListeners();
}
}
void main() => runApp(
ChangeNotifierProvider<ThemeNotifier>(
builder: (_) => ThemeNotifier(darkTheme),
child: MyApp(),
),
);
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
final themeNotifier = Provider.of<ThemeNotifier>(context);
return MaterialApp(
title: 'Chitr',
theme: themeNotifier.getTheme(),
home: HomePage(),
);
}
}
导入“包装:颤振/材料.省道”;
使用ChangeNotifier对消息过滤器进行分类{
主题数据;
主题化器(本主题数据);
getTheme()=>\u主题数据;
setTheme(主题数据主题数据)异步{
_主题数据=主题数据;
notifyListeners();
}
}
void main()=>runApp(
变更通知提供者(
建造商:()=>ThemeNotifier(暗色),
子项:MyApp(),
),
);
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
final themeNotifier=Provider.of(上下文);
返回材料PP(
标题:“Chitr”,
主题:themeNotifier.getTheme(),
主页:主页(),
);
}
}
您需要遵循以下步骤
import 'package:flutter/material.dart';
final darkTheme = ThemeData(
primarySwatch: Colors.grey,
primaryColor: Colors.black,
brightness: Brightness.dark,
backgroundColor: const Color(0xFF212121),
accentColor: Colors.white,
accentIconTheme: IconThemeData(color: Colors.black),
dividerColor: Colors.black12,
);
final lightTheme = ThemeData(
primarySwatch: Colors.grey,
primaryColor: Colors.white,
brightness: Brightness.light,
backgroundColor: const Color(0xFFE5E5E5),
accentColor: Colors.black,
accentIconTheme: IconThemeData(color: Colors.white),
dividerColor: Colors.white54,
);
提供者类
import 'package:flutter/material.dart';
class ThemeNotifier with ChangeNotifier {
ThemeData _themeData;
ThemeNotifier(this._themeData);
getTheme() => _themeData;
setTheme(ThemeData themeData) async {
_themeData = themeData;
notifyListeners();
}
}
void main() => runApp(
ChangeNotifierProvider<ThemeNotifier>(
builder: (_) => ThemeNotifier(darkTheme),
child: MyApp(),
),
);
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
final themeNotifier = Provider.of<ThemeNotifier>(context);
return MaterialApp(
title: 'Chitr',
theme: themeNotifier.getTheme(),
home: HomePage(),
);
}
}
导入“包装:颤振/材料.省道”;
使用ChangeNotifier对消息过滤器进行分类{
主题数据;
主题化器(本主题数据);
getTheme()=>\u主题数据;
setTheme(主题数据主题数据)异步{
_主题数据=主题数据;
notifyListeners();
}
}
void main()=>runApp(
变更通知提供者(
建造商:()=>ThemeNotifier(暗色),
子项:MyApp(),
),
);
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
final themeNotifier=Provider.of(上下文);
返回材料PP(
标题:“Chitr”,
主题:themeNotifier.getTheme(),
主页:主页(),
);
}
}