GITHUB地址: https://github.com/CZXBigBrother/MCFlutterScaffoldProject
- 1.国际化
- 2.主题切换
- 3.存储管理
- 4.状态管理
- 5.通用工具 这五项几乎是每个项目都通用的,所以这次提取出来统一配置,之后启动新项目时直接拿来即用.
我们依赖国际化的两个package:
- 1.intl https://pub.flutter-io.cn/packages/intl
- 2.intl_translation [https://pub.flutter-io.cn/packages/intl_translation](https://pub.flutter- io.cn/packages/intl_translation)
intl有一篇专门使用的文章使用Intl包
intl_translation 是用来生成arb的翻译文件,所以添加的依赖只用在dev环境下
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'messages_all.dart'; //1
class GmLocalizations {
static Future<GmLocalizations> load(Locale locale) {
final String name =
locale.countryCode.isEmpty ? locale.languageCode : locale.toString();
final String localeName = Intl.canonicalizedLocale(name);
//2
return initializeMessages(localeName).then((b) {
Intl.defaultLocale = localeName;
return new GmLocalizations();
});
}
static GmLocalizations of(BuildContext context) {
return Localizations.of<GmLocalizations>(context, GmLocalizations);
}
String get title => Intl.message('MCflutter 快速开发框架', name: 'title');
String get language => Intl.message('语言', name: 'language');
String get setting => Intl.message('设置', name: 'setting');
String get theme => Intl.message('主题', name: 'theme');
String get auto => Intl.message('自动', name: 'auto');
String get statemanagement => Intl.message('状态管理', name: 'statemanagement');
}
//Locale代理类
class GmLocalizationsDelegate extends LocalizationsDelegate<GmLocalizations> {
const GmLocalizationsDelegate();
//是否支持某个Local
@override
bool isSupported(Locale locale) => ['en', 'zh'].contains(locale.languageCode);
// Flutter会调用此类加载相应的Locale资源类
@override
Future<GmLocalizations> load(Locale locale) {
//3
return GmLocalizations.load(locale);
}
// 当Localizations Widget重新build时,是否调用load重新加载Locale资源.
@override
bool shouldReload(GmLocalizationsDelegate old) => false;
}
Provider使用起来学习成本更小而且管理容易 Providerhttps://pub.flutter-io.cn/packages/provider Provider学习文章https://www.jianshu.com/p/f220136c05d4
创建一个通知的基类
class ProfileChangeNotifier extends ChangeNotifier {
Profile get _profile => Global.profile;
@override
void notifyListeners() {
Global.saveProfile(); //保存Profile变更
super.notifyListeners(); //通知依赖的Widget更新
}
}
�主题和语言改变发出通知
class ThemeModel extends ProfileChangeNotifier {
// 获取当前主题,如果为设置主题,则默认使用蓝色主题
ColorSwatch get theme => Global.themes
.firstWhere((e) => e.value == _profile.theme, orElse: () => Colors.blue);
// 主题改变后,通知其依赖项,新主题会立即生效
set theme(ColorSwatch color) {
if (color != theme) {
_profile.theme = color[500].value;
notifyListeners();
}
}
}
class LocaleModel extends ProfileChangeNotifier {
// 获取当前用户的APP语言配置Locale类,如果为null,则语言跟随系统语言
Locale getLocale() {
if (_profile.locale == null) return null;
var t = _profile.locale.split("_");
return Locale(t[0], t[1]);
}
// 获取当前Locale的字符串表示
String get locale => _profile.locale;
// 用户改变APP语言后,通知依赖项更新,新语言会立即生效
set locale(String locale) {
if (locale != _profile.locale) {
_profile.locale = locale;
notifyListeners();
}
}
}
在main中注册
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MultiProvider(
providers: <SingleChildCloneableWidget>[
ChangeNotifierProvider.value(value: ThemeModel()),
ChangeNotifierProvider.value(value: LocaleModel()),
],
child: Consumer2<ThemeModel, LocaleModel>(
builder:
(BuildContext context, themeModel, localeModel, Widget widget) {
return MaterialApp(
navigatorKey: navigationService.navigatorKey,
// title: GmLocalizations.of(context).title,
onGenerateTitle: (context) {
return GmLocalizations.of(context).title;
},
theme: ThemeData(
primarySwatch: themeModel.theme,
),
home: MyHomePage(),
locale: localeModel.getLocale(),
supportedLocales: [
//我们只支持美国英语和中文简体
const Locale('en', 'US'), // 美国英语
const Locale('zh', 'CN'), // 中文简体
//其它Locales
],
localizationsDelegates: [
// 本地化的代理类
GlobalMaterialLocalizations.delegate,
GlobalWidgetsLocalizations.delegate,
GmLocalizationsDelegate()
],
localeResolutionCallback:
(Locale _locale, Iterable<Locale> supportedLocales) {
if (localeModel.getLocale() != null) {
//如果已经选定语言,则不跟随系统
return localeModel.getLocale();
} else {
//跟随系统
Locale locale;
if (supportedLocales.contains(_locale)) {
locale = _locale;
} else {
//如果系统语言不是中文简体或美国英语,则默认使用美国英语
locale = Locale('zh', 'CN');
}
return locale;
}
},
routes: <String, WidgetBuilder>{},
);
},
),
);
}
}
主题相对来说比较简单,不需要依赖太多外部的框架 global设置
const _themes = <MaterialColor>[
Colors.blue,
Colors.cyan,
Colors.teal,
Colors.green,
Colors.red,
];
static List<MaterialColor> get themes => _themes;
在上面写的函数中可以找到,添加了通知
ChangeNotifierProvider.value(value: LocaleModel()),
theme: ThemeData(
primarySwatch: themeModel.theme,
),
shared_preferences https://pub.flutter-io.cn/packages/shared_preferences shared_preferences很多人都已经用过了不做过多的介绍.主要说明下,如何把原来异步的任务变成同步. shared_preferences 异步有两个地方,一个是初始一个是存储 项目初始化的时候,可以将shared_preferences初始化然后存储下来,shared_preferences在get的时候是同步的,我们就不需要处理了,存储的时候我们依旧是异步的,这样能解决app启动是需要初始化的参数问题
static SharedPreferences preferences;
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