Flutter 国际化相关

2019-10-12 15:58:05

一、纯SDK实现：

1、直接使用SDK提供的API，代码如下：

 1 abstract class LangangeBase {
 2   Map<String, String> langStr = new HashMap();
 3 }
 4 
 5 class LangangeEn extends LangangeBase {
 6   LangangeEn() {
 7     langStr['title'] = 'Title';
 8     langStr['desc'] = 'Description';
 9     langStr['content'] = 'Content：Hello World!';
10   }
11 }
12 
13 class LangangeZh extends LangangeBase {
14   LangangeZh() {
15     langStr['title'] = '标题';
16     langStr['desc'] = '描述';
17     langStr['content'] = '内容：世界，你好！';
18   }
19 }

2、Delegate及包装类代码：

 1 class Translations {
 2   static LangangeBase _langangeBase;
 3 
 4   // 默认使用简体中文
 5   static Future<Translations> load(Locale locale) async {
 6     print('加载语言 langCode = ${locale.languageCode}');
 7     Translations translations = new Translations();
 8     if (locale.languageCode == 'en') {
 9       _langangeBase = new LangangeEn();
10     } else {
11       _langangeBase = new LangangeZh();
12     }
13 
14     return translations;
15   }
16 
17   String text(String key) {
18     return _langangeBase.langStr[key];
19   }
20 
21   static Translations of(BuildContext context) {
22     Translations ret = Localizations.of(context, Translations);
23     print('Translations of result = $ret');
24     return ret;
25   }
26 }
27 
28 class MyLocalizations extends LocalizationsDelegate<Translations> {
29   @override
30   bool isSupported(Locale locale) {
31     print('isSupported ${locale.languageCode}');
32     // 只支持简体中文、美式英语
33     return /*['zh', 'en'].contains(locale.languageCode)*/true;
34   }
35 
36   @override
37   bool shouldReload(LocalizationsDelegate<Translations> old) {
38     return false;
39   }
40 
41   @override
42   Future<Translations> load(Locale locale) {
43     return Translations.load(locale);
44   }
45 
46   static MyLocalizations delegate = new MyLocalizations();
47 }

二、使用Intl库

1、创建一个独立的dart字符串类，便于生产arb文件，如下：

 1 class LocalStr {
 2   /**
 3    * 这里的是兜底文案，在没有相对应的本地化资源时使用
 4    */
 5   static String get title =>
 6       Intl.message('Default:天王盖地虎', name: 'title', desc: 'APP标题');
 7 
 8   static String get desc =>
 9       Intl.message('Default:智取威虎山', name: 'desc', desc: '标题的描述');
10 
11   static String get content => Intl.message('Default:电影讲述了东北解放军如何消灭盘踞山岭的土匪的故事',
12       name: 'content', desc: 'App的主要内容');
13 }

2、Delegate及包装类代码：

 1 class IntlLocalizations {
 2 
 3   static Future<IntlLocalizations> load(Locale locale) {
 4     String name = locale.countryCode.isEmpty ? locale.languageCode : locale.toString();
 5     print('local = ${Intl.canonicalizedLocale(name)}');
 6     return initializeMessages(name).then((b) {
 7       Intl.defaultLocale = name;
 8       return new IntlLocalizations();
 9     });
10   }
11 
12   String get title1 => LocalStr.title;
13 
14   String get desc1 => LocalStr.desc;
15 
16   String get content1 => LocalStr.content;
17 
18   static IntlLocalizations of(BuildContext context) {
19     return Localizations.of<IntlLocalizations>(context, IntlLocalizations);
20   }
21 }
22 
23 class IntlLocalizatoinsDelegate extends LocalizationsDelegate<IntlLocalizations> {
24   @override
25   bool isSupported(Locale locale) {
26     print('lang code = ${locale.languageCode}');
27     return /*['zh', 'en'].contains(locale.languageCode)*/true;
28   }
29 
30   @override
31   Future<IntlLocalizations> load(Locale locale) {
32     return IntlLocalizations.load(locale);
33   }
34 
35   @override
36   bool shouldReload(LocalizationsDelegate old) {
37     return false;
38   }
39 
40   static IntlLocalizatoinsDelegate delegate = new IntlLocalizatoinsDelegate();
41 }

3、最终的代码结构图：

 

 posted on 2019-10-12 16:07  wlrhnh  阅读(501)  评论(0)  编辑  收藏  举报