public class MyApplication extends Application {
    @Override
    protected void onCreate() {
        super.onCreate();
        TUIThemeManager.getInstance().changeLanguage(this, TUIThemeManager.LANGUAGE_ZH_CN);
    }

    /**
    * The available language options are enumerated as follows:
    * TUIThemeManager.LANGUAGE_EN        ---- English
    * TUIThemeManager.LANGUAGE_ZH_CN     ---- Simplified Chinese
    * TUIThemeManager.LANGUAGE_AR        ---- Arabic
    */
}

TUIThemeManager.getInstance().changeLanguage(context, TUIThemeManager.LANGUAGE_ZH_CN);
System.exit(0);
Intent intent = context.getPackageManager().getLaunchIntentForPackage(context.getPackageName());
context.startActivity(intent);

setWebViewLanguage(appContext);

private void setThemeInternal(Context context) {
    if (context == null) {
        return;
    }

    Context appContext = context.getApplicationContext();
    if (!isInit) {
        isInit = true;
        if (appContext instanceof Application) {
            ((Application) appContext).registerActivityLifecycleCallbacks(new ThemeAndLanguageCallback());
        }

        /**
        * add code here  begin
        */
        setWebViewLanguage(appContext);
        /**
        * add code here  end
        */
        Locale defaultLocale = getLocale(appContext);
        SPUtils spUtils = SPUtils.getInstance(SP_THEME_AND_LANGUAGE_NAME);
        currentLanguage = spUtils.getString(SP_KEY_LANGUAGE, defaultLocale.getLanguage());
        currentThemeID = spUtils.getInt(SP_KEY_THEME, THEME_LIGHT);

        // The language only needs to be initialized once
        applyLanguage(appContext);
    }
    // The theme needs to be updated multiple times
    applyTheme(appContext);
}

public class MyApplication extends Application {
    @Override
    protected void onCreate() {
        super.onCreate();
        // Add Korean
        TUIThemeManager.addLanguage("ko-rKR", Locale.KOREA);
        // Change the application language to Korean.
        TUIThemeManager.getInstance().changeLanguage(this, "ko-rKR");
    }
}