provider: ^3.1.0
shared_preferences: ^0.5.2
複製程式碼參考： www.imooc.com/article/293…
Main.js
頂端註冊provider，初始化
主要程式碼
Widget build(BuildContext context) {
//獲取本地語言（我這裡是zh_CN）
String locale=WidgetsBinding.instance.window.locale.toString();
print('loacle:'+locale);
//本地儲存SharedPreferences.get
String value = LocalStorage.get('language'); //獲取本地儲存
String language;
if (value == null) {
if (locale == 'zh_CN' || locale == 'zh_TW' || locale == 'zh_HK') {
language = 'Chinese';
} else
language = "English";
} else
language = value; //有就改
return MultiProvider(//註冊provider
providers: [
ChangeNotifierProvider(builder: (_) => LanguageModel(language)),
//在這提供provider
],
child: child, //孩子
);
}
複製程式碼主要思想：
if 有沒有用SharedPreferences preferences儲存
用本地存的
else
看系統語言設定
if 是中國
用中文
else
英文
複製程式碼全程式碼：
import 'package:flutter/material.dart';
import 'package:jieda/Page/A_login/LoginPage.dart';
import 'package:jieda/common/CommonInsert.dart';
void main() => realRunApp();
void realRunApp() async {
WidgetsFlutterBinding.ensureInitialized();
//將LocalStorage 非同步轉為同步
bool success = await LocalStorage.getInstance();
///初始化螢幕介面卡
Adapt.init();
assert(success);
LocalImageSelecter.init();
// runApp(ChangeNotifierProvider.value(
//// value: LanguageModel(),
//// child:
//// MyApp(),
//// ),);這種也行，不過要有帶build的class才能執行方法
runApp(Wrapper(child:MyApp()));
}
class Wrapper extends StatelessWidget {
final Widget child;
Wrapper({this.child});
@override
Widget build(BuildContext context) {
//獲取本地語言（我這裡是zh_CN）
String locale=WidgetsBinding.instance.window.locale.toString();
print('loacle:'+locale);
//本地儲存SharedPreferences.get
String value = LocalStorage.get('language'); //獲取本地儲存
String language;
if (value == null) {
if (locale == 'zh_CN' || locale == 'zh_TW' || locale == 'zh_HK') {
language = 'Chinese';
} else
language = "English";
} else
language = value; //有就改
return MultiProvider(//註冊provider
providers: [
ChangeNotifierProvider(builder: (_) => LanguageModel(language)),
//在這提供provider
],
child: child, //孩子
);
}
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: '用provider進行國際化',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: LoginPage(),//登入頁
);
}
}
複製程式碼Language.dart
import 'package:flutter/material.dart';
import 'package:jieda/common/local/LocalStorage.dart';
class LanguageModel with ChangeNotifier {
String _language = "Chinese";
//獲取當前語言
String get value => _language;
LanguageModel(this._language);
void initValue(){//無用，不如建構函式啊
String getvalue=LocalStorage.get('language');
if(getvalue!=null) setLanguage(getvalue);
}
//切換語言
void switchLanguage() {
if(_language=="Chinese") {
_language = "English";
LocalStorage.save('language','English');
}
else if(_language=="English") {
_language="Chinese";
LocalStorage.save('language','Chinese');
}
notifyListeners();
}
//設定語言，加這個是怕以後不只兩個語言
void setLanguage(value) {
_language = value;
LocalStorage.save('language',value);
notifyListeners();
}
Map get test => contains[_language];
Map<String, Map<String, String>> contains={
'Chinese': {
'modifyPasswordtitle': '驗證原密碼',
'welecome':"歡迎回來，請登入",
},
'English': {
'modifyPasswordtitle': 'Verify the original password',
'welecome': "Welecome back,please log in",
'phone': "Phone",
}
};
複製程式碼在該用的頁面的引用
class Setting extends StatefulWidget {
@override
_SettingState createState() => _SettingState();
}
class _SettingState extends State<Setting> {
var test;
@override
Widget build(BuildContext context) {
test = Provider.of<LanguageModel>(context).test;//獲取文字
return Scaffold(
resizeToAvoidBottomInset: false,
backgroundColor: MyColors.bg,
appBar: MyAppBar(title: test['modifyPasswordtitle'],),//直接用
複製程式碼切換語言的頁面程式碼
import 'package:jieda/common/CommonInsert.dart';
class SelectLanguage extends StatefulWidget {
@override
_SelectLanguageState createState() => _SelectLanguageState();
}
class _SelectLanguageState extends State<SelectLanguage> {
@override
Widget build(BuildContext context) {
String _language = Provider.of<LanguageModel>(context).value;
Map test = Provider.of<LanguageModel>(context).test;//兩種寫法供君選擇
String english=_language=="English"?'English':"英文";
String chinese=_language=="English"?'Chinese':"中文";
String title=_language=="English"?'Switch Language':"切換語言";
return Scaffold(
backgroundColor: MyColors.bg,
appBar: MyAppBar(
title:title,
),
body: Column(
children: <Widget>[
SizedBox(height: Adapt.dp(10),),
Consumer<LanguageModel>(
builder: (context, LanguageModel language, child) =>GestureDetector( behavior: HitTestBehavior.translucent,onTap: _language!="English"?(){language.setLanguage('English');}:null,
child: child,),
child: Container(height: Adapt.dp(50),color: Colors.white,padding: EdgeInsets.only(left: 16,right: 13),
child: Row(mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(english,style: TextStyle(fontSize: 12),),Icon(_language=="English"?Icons.check_circle:Icons.panorama_fish_eye,color: _language=="English"?MyColors.ls:Colors.black26,)
],),),
),
SizedBox(height:1 ,),
Consumer<LanguageModel>(
builder: (context, LanguageModel language, child) =>GestureDetector( behavior: HitTestBehavior.translucent,onTap: _language=="English"?language.switchLanguage:null,
child: child,),
child: Container(height: Adapt.dp(50),color: Colors.white,padding: EdgeInsets.only(left: 16,right: 13),
child: Row(mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(chinese,style: TextStyle(fontSize: 12),),Icon(_language!="English"?Icons.check_circle:Icons.panorama_fish_eye,color: _language!="English"?MyColors.ls:Colors.black26,)
],),),
),
],
),
);
}
}
複製程式碼後記：
我研究了一下
flutter_localizations
複製程式碼好像有bug，
這個外掛也是provider寫的呀，那我直接用Provider，應該也可以。
參考：
flutter_localizations： book.flutterchina.club/chapter15/e…
init18好像不錯
犯過的錯:
之前在Main中是沒搞這個Warapper的
嘗試
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
Provider.of<LanguageModel>(context).initValue();
//報錯，說是有方法during SetState。。
return MaterialApp(
title: '捷達智慧電器',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: LoginPage(),
);
}
}
複製程式碼-
獲取系統語言
www.jianshu.com/p/618daec5f… 不好用
blog.csdn.net/u011216417/… 這個好
獲取應用語言環境Locale : WidgetsBinding.instance.window.locale
進入，檢測裝置系統語言是否是中文 --
有zh-CN zh-TW zh-HK 中國，臺灣，香港