解决Android 7.0 App内切换语言不生效的问题

Android7.0及以前版本，Configuration中的语言相当于是App的全局设置：

public static void changeAppLanguage(Context context, String newLanguage){  2     Resources resources = context.getResources();  3     Configuration configuration = resources.getConfiguration();  4  
    // app locale
    Locale locale = getLocaleByLanguage(newLanguage);  7  
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {  9  configuration.setLocale(locale); 10     } else { 11         configuration.locale = locale; 12  } 13  
    // updateConfiguration
    DisplayMetrics dm = resources.getDisplayMetrics(); 16  resources.updateConfiguration(configuration, dm); 17 }

然后在继承application的类中调用即可：

public class App extends Application {  2  
 @Override  4     public void onCreate() {  5  super.onCreate();  6  onLanguageChange();  7  }  8  
    /** 10  * Handling Configuration Changes 11  * @param newConfig newConfig 12      */
 @Override 14     public void onConfigurationChanged(Configuration newConfig) { 15  super.onConfigurationChanged(newConfig); 16  onLanguageChange(); 17  } 18  
    private void onLanguageChange() { 20         String language;//读取App配置
        AppLanguageUtils.changeAppLanguage(this, language); 22  } 23 }

 

Android7.0及之后版本，使用了LocaleList，Configuration中的语言设置可能获取的不同，而是生效于各自的Context。

这会导致：Android7.0使用就的方式，有些Activity可能会显示为手机的系统语言。

Android7.0 优化了对多语言的支持，废弃了updateConfiguration()方法，替代方法：createConfigurationContext(), 而返回的是Context。

也就是语言需要植入到Context中，每个Context都植入一遍。

GitHub地址

MultiLanguagesSwitch

转自：https://yanlu.me/android-7-0-app-language-switch/

 

我自己的使用方式如下：

1.创建工具类

public class AppLanguageUtils {  2 
    public static HashMap<String, Locale> mAllLanguages = new HashMap<String, Locale>(8) {{  4  put(Constants.ENGLISH, Locale.ENGLISH);  5  put(Constants.CHINESE, Locale.SIMPLIFIED_CHINESE);  6  put(Constants.SIMPLIFIED_CHINESE, Locale.SIMPLIFIED_CHINESE);  7  put(Constants.TRADITIONAL_CHINESE, Locale.TRADITIONAL_CHINESE);  8  put(Constants.FRANCE, Locale.FRANCE);  9  put(Constants.GERMAN, Locale.GERMANY); 10         put(Constants.HINDI, new Locale(Constants.HINDI, "IN")); 11  put(Constants.ITALIAN, Locale.ITALY); 12  }}; 13 
    @SuppressWarnings("deprecation") 15     public static void changeAppLanguage(Context context, String newLanguage) { 16         Resources resources = context.getResources(); 17         Configuration configuration = resources.getConfiguration(); 18 
        // app locale
        Locale locale = getLocaleByLanguage(newLanguage); 21 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { 23  configuration.setLocale(locale); 24         } else { 25             configuration.locale = locale; 26  } 27 
        // updateConfiguration
        DisplayMetrics dm = resources.getDisplayMetrics(); 30  resources.updateConfiguration(configuration, dm); 31  } 32 

    private static boolean isSupportLanguage(String language) { 35         return mAllLanguages.containsKey(language); 36  } 37 
    public static String getSupportLanguage(String language) { 39         if (isSupportLanguage(language)) { 40             return language; 41  } 42 
        if (null == language) {//为空则表示首次安装或未选择过语言，获取系统默认语言
            Locale locale = Locale.getDefault(); 45             for (String key : mAllLanguages.keySet()) { 46                 if (TextUtils.equals(mAllLanguages.get(key).getLanguage(), locale.getLanguage())) { 47                     return locale.getLanguage(); 48  } 49  } 50  } 51         return Constants.ENGLISH; 52  } 53 
    /** 55  * 获取指定语言的locale信息，如果指定语言不存在{@link #mAllLanguages}，返回本机语言，如果本机语言不是语言集合中的一种{@link #mAllLanguages}，返回英语 56  * 57  * @param language language 58  * @return 59      */
    public static Locale getLocaleByLanguage(String language) { 61         if (isSupportLanguage(language)) { 62             return mAllLanguages.get(language); 63         } else { 64             Locale locale = Locale.getDefault(); 65             for (String key : mAllLanguages.keySet()) { 66                 if (TextUtils.equals(mAllLanguages.get(key).getLanguage(), locale.getLanguage())) { 67                     return locale; 68  } 69  } 70  } 71         return Locale.ENGLISH; 72  } 73 

    public static Context attachBaseContext(Context context, String language) { 76         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { 77             return updateResources(context, language); 78         } else { 79             return context; 80  } 81  } 82 

 @TargetApi(Build.VERSION_CODES.N) 85        private static Context updateResources(Context context, String language) { 86         Resources resources = context.getResources(); 87         Locale locale = AppLanguageUtils.getLocaleByLanguage(language); 88 
           Configuration configuration = resources.getConfiguration(); 90  configuration.setLocale(locale); 91            configuration.setLocales(new LocaleList(locale)); 92            return context.createConfigurationContext(configuration); 93  } 94 
}

2.在继承application的类中重写attachBaseContext()方法等操作

    private static Context sContext;  2     private String language;  3 
 @Override  5     protected void attachBaseContext(Context base) {  6 super.attachBaseContext(AppLanguageUtils.attachBaseContext(base, getAppLanguage(base)));  7  }  8 
 @Override 10     public void onCreate() { 11  super.onCreate(); 12         sContext = this; 13         spu = new SharedPreferencesUtil(getApplicationContext()); 14         language = spu.getString("language"); 15  onLanguageChange(); 16  } 17 
    public static Context getContext() { 19         return sContext; 20  } 21 
    /** 23  * Handling Configuration Changes 24  * @param newConfig newConfig 25      */
 @Override 27     public void onConfigurationChanged(Configuration newConfig) { 28  super.onConfigurationChanged(newConfig); 29  onLanguageChange(); 30  } 31 
    private void onLanguageChange() { 33  // AppLanguageUtils.changeAppLanguage(this, AppLanguageUtils.getSupportLanguage(getAppLanguage(this)));
        AppLanguageUtils.changeAppLanguage(this, AppLanguageUtils.getSupportLanguage(language)); 35  } 36 
    private String getAppLanguage(Context context) { 38         String appLang = PreferenceManager.getDefaultSharedPreferences(context) 39                 .getString("language", Constants.ENGLISH); 40         return appLang ; 41     }

3.在需要切换语言的SetLanguageActivity中设置切换方法

    private void onChangeAppLanguage(String newLanguage) { spu.putString("language", newLanguage); AppLanguageUtils.changeAppLanguage(this, newLanguage); AppLanguageUtils.changeAppLanguage(App.getContext(), newLanguage); this.recreate(); }

4.跳转到SetLanguageActivity的原界面语言需要刷新

//携参跳转
startActivityForResult(new Intent(OriginActivity.this, SetLanguageActivity.class), CHANGE_LANGUAGE_REQUEST_CODE);

//切换后返回刷新
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == CHANGE_LANGUAGE_REQUEST_CODE) { recreate(); } }

 

That's all.