Android语言切换

Android语言切换方式实现，各应用需要准备两套String资源文件（中/英文）。
核心代码如下：

    public static void setAppLanguage(Locale locale) {
        String language = locale.getLanguage();
        LogUtils.d(TAG, "setAppLanguage: locale = " + locale + ", language = " + language);
        if (TextUtils.equals(language, Locale.CHINESE.toString())) {//中文
            Log.d(TAG, "setAppLanguage(), persist.sys.locale = " + VALUE_LOCAL_ZH);
            SystemProperties.set(KEY_LOCAL, VALUE_LOCAL_ZH);
            InstrumentController.getInstance().sendLanguageChangeReq(1);
        } else if (TextUtils.equals(language, Locale.ENGLISH.toString())) {//英语
            Log.d(TAG, "setAppLanguage(), persist.sys.locale = " + VALUE_LOCAL_EN);
            SystemProperties.set(KEY_LOCAL, VALUE_LOCAL_EN);
            InstrumentController.getInstance().sendLanguageChangeReq(2);
        }
        try {
            Log.d(TAG, "setAppLanguage() start " + locale.toString());
            Object objIActMag;
            Class clzAm = ActivityManager.class;
            ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);
            Class clzIActMag = Class.forName("android.app.IActivityManager");

            Method getIamMethod = clzAm.getMethod("getService");
            objIActMag = getIamMethod.invoke(am);

            Method mtdIActMagGetConfiguration = clzIActMag.getDeclaredMethod("getConfiguration");
            Configuration config = (Configuration) mtdIActMagGetConfiguration.invoke(objIActMag);
            config.setLocale(locale);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                config.setLocales(new LocaleList(locale));
            }

            Method updatePersistentConfigurationMethod = clzIActMag.getMethod("updatePersistentConfiguration", Configuration.class);
            updatePersistentConfigurationMethod.invoke(objIActMag, config);

            Class[] clzParams = {Configuration.class};
            Method mtdIActMagUpdateConfiguration = clzIActMag.getDeclaredMethod(
                    "updateConfiguration", clzParams);
            mtdIActMagUpdateConfiguration.invoke(objIActMag, config);

            Log.d(TAG, "setAppLanguage()  end ");

        } catch (Exception e) {
            Log.d(TAG, "setAppLanguage() Exception " + e.getMessage());
            e.printStackTrace();
        }
    }

• 需要监听主题切换，需要在AndroidManifest的activity标签增加android:configChanges =
  “layoutDirection|locale”，重写onConfigurationChanged方法，在onConfigurationChanged中处理切换主题后的逻辑，重新加载资源；

优点 ：当AndroidManifest.xml 里增加"layoutDirection|locale" ，可以避免页面闪烁问题，防止页面重走生命周期

        <activity
            android:name=".activity.MainActivity"
            android:configChanges="layoutDirection|locale"
            android:theme="@style/AppTheme">

    @Override
    public void onConfigurationChanged(@NonNull Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        String currentLanguage = newConfig.locale.getLanguage();
        LogUtils.e(TAG, "onConfigurationChanged currentLanguage: " + currentLanguage);
        }
        //重新设置对应页面的字符串id