Android 语言切换

旧城等待， 2023-03-02 05:06 10阅读 0赞

#### 一、实现思路 ####

*  在application 的 attachBaseContext设置当前设置的语言Local
 *  在application 的onConfigurationChanged（改变系统语言时会调用到）设置当前的语言Local
 *  在 Activity 的attachBaseContext设置当前设置的语言Local，所以一般这里是创建BaseActivity来方便统一改变
 *  在 service 的attachBaseContext设置当前设置的语言Local

#### 二、用sp中保存设置 ####

public class SPUtil {
    
        private final String SP_NAME = "language_setting";
        private final String TAG_LANGUAGE = "language_select";
        private static volatile SPUtil instance;
    
        private final SharedPreferences mSharedPreferences;
    
        public SPUtil(Context context) {
            mSharedPreferences = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE);
        }
    
    
        public void saveLanguage(int select) {
            SharedPreferences.Editor edit = mSharedPreferences.edit();
            edit.putInt(TAG_LANGUAGE, select);
            edit.commit();
        }
    
        public int getSelectLanguage() {
            return mSharedPreferences.getInt(TAG_LANGUAGE, 0);
        }
    
        public static SPUtil getInstance(Context context) {
            if (instance == null) {
                synchronized (SPUtil.class) {
                    if (instance == null) {
                        instance = new SPUtil(context);
                    }
                }
            }
            return instance;
        }
    }

#### 三、获取语言 ####

/**
         * 获取选择的语言设置
         *
         * @param context
         * @return
         */
        public static Locale getSetLanguageLocale(Context context) {
    
            switch (SPUtil.getInstance(context).getSelectLanguage()) {
                case 0:
                    return getSystemLocale(context);
                case 1:
                    return Locale.CHINA;
                case 2:
                    return Locale.TAIWAN;
                case 3:
                default:
                    return Locale.ENGLISH;
            }
        }
    
     /**
         * 获取系统的locale
         *
         * @return Locale对象
         */
        public static Locale getSystemLocale(Context context) {
            Locale locale;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                locale = LocaleList.getDefault().get(0);
            } else {
                locale = Locale.getDefault();
            }
            return locale;
        }

#### 四、改变语言 ####

public static Context setLocal(Context context) {
            return updateResources(context, getSetLanguageLocale(context));
        }
    
    private static Context updateResources(Context context, Locale locale) {
         Locale.setDefault(locale);
    
         Resources res = context.getResources();
         Configuration config = new Configuration(res.getConfiguration());
         if (Build.VERSION.SDK_INT >= 17) {
             config.setLocale(locale);
             context = context.createConfigurationContext(config);
         } else {
             config.locale = locale;
             res.updateConfiguration(config, res.getDisplayMetrics());
         }
         return context;
     }

#### 五、在相应的地方调用设置语言 ####

（1）、Application

@Override
        protected void attachBaseContext(Context base) {
           super.attachBaseContext(LocalManageUtil.setLocal(base));
        }
    
       @Override
        public void onConfigurationChanged(Configuration newConfig) {
            super.onConfigurationChanged(newConfig);
            LocalManageUtil.setLocal(context);
        }

（2）、BaseActivity

@Override
        protected void attachBaseContext(Context newBase) {
            super.attachBaseContext(LocalManageUtil.setLocal(newBase));
        }

（3）、service

@Override
        protected void attachBaseContext(Context base) {
            super.attachBaseContext(LocalManageUtil.setLocal(base));
        }

（4）、切换语言

private void selectLanguage(int select) {
            LocalManageUtil.saveSelectLanguage(this, select);
            //重启APP到主页面
            MainActivity.reStart(this);
        }