Resources.updateConfiguration()已经弃用，我已经解决了这个问题，没有创建任何自定义的ContextWrapper。

首先我创建了一个扩展函数

fun Context.setAppLocale(language: String): Context {
    val locale = Locale(language)
    Locale.setDefault(locale)
    val config = resources.configuration
    config.setLocale(locale)
    config.setLayoutDirection(locale)
    return createConfigurationContext(config)
}

然后在活动的attachBaseContext方法中，简单地用新的上下文替换上下文。

override fun attachBaseContext(newBase: Context) {
  super.attachBaseContext(ContextWrapper(newBase.setAppLocale("bn")))
}

/*change language at Run-time*/
//use method like that:
//setLocale("en");
 public void setLocale(String lang) { 
  myLocale = new Locale(lang);         
  Resources res = getResources();         
  DisplayMetrics dm = res.getDisplayMetrics();         
  Configuration conf = res.getConfiguration();         
  conf.locale = myLocale;         
  res.updateConfiguration(conf, dm);         
  Intent refresh = new Intent(this, AndroidLocalize.class);         
  startActivity(refresh); 
 }

只是多添了一块，把我绊倒了。

而其他的答案，比如“de”，都没问题

String lang = "de";
Locale locale = new Locale(lang); 
Locale.setDefault(locale);
Configuration config = new Configuration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, 
    getBaseContext().getResources().getDisplayMetrics());

上面不会工作，例如“fr_BE”地区，所以它将使用values-fr-rBE文件夹或类似的。

需要以下轻微更改工作与“fr_BE”

String lang = "fr";

//create a string for country
String country = "BE";
//use constructor with country
Locale locale = new Locale(lang, country);

Locale.setDefault(locale);
Configuration config = new Configuration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, 
    getBaseContext().getResources().getDisplayMetrics());

在运行每个Activity时，必须对attachBaseContext函数进行这些更改。

public Context createConfiguration(Context context, String lan) {
    Locale locale = new Locale(lan);
    Configuration configuration = new Configuration(context.getResources().getConfiguration());
    configuration.setLocale(locale);
    return context.createConfigurationContext(configuration);
}

@Override
protected void attachBaseContext(Context newBase) {
    super.attachBaseContext(createConfiguration(newBase, "en"/*LANGUAGE_SELECTED*/)));
}

同样，对于您所在的活动，在更改语言后，调用函数recrere ();

首先为不同的语言创建多个string.xml;然后在onCreate()方法中使用这段代码:

super.onCreate(savedInstanceState);
String languageToLoad  = "fr"; // change your language here
Locale locale = new Locale(languageToLoad); 
Locale.setDefault(locale);
Configuration config = new Configuration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config, 
  getBaseContext().getResources().getDisplayMetrics());
this.setContentView(R.layout.main);

您可以要求用户在第一个屏幕中选择语言并将其保存在SharedPreferences中

SharedPreferences.Editor editor = getSharedPreferences("data", MODE_PRIVATE).edit();
editor.putString("lang", "si");
editor.apply();
    
recreate();

然后你可以在应用程序中的每个Activity中使用它。这里我设置了英语和僧伽罗语。

@Override
protected void attachBaseContext(Context base) {
    SharedPreferences prefs = base.getSharedPreferences("uinfo", MODE_PRIVATE);
    String restoredText = prefs.getString("lang", "No name defined");

    if (restoredText.equals("si")){
        super.attachBaseContext(LocaleHelper.localeUpdateResources(base, "si"));
    }else{
        super.attachBaseContext(LocaleHelper.localeUpdateResources(base, "en"));
    }
}

这是你的localUpdateResources方法。把它放在LocalHelper类中

public class LocaleHelper {
    public static Context localeUpdateResources(Context context, String languageCode) {

        Context newContext = context;

        Locale locale = new Locale(languageCode);
        Locale.setDefault(locale);

        Resources resources = context.getResources();
        Configuration config = new Configuration(resources.getConfiguration());

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {

            config.setLocale(locale);
            newContext = context.createConfigurationContext(config);

        } else {

            config.locale = locale;
            resources.updateConfiguration(config, resources.getDisplayMetrics());
        }

        return newContext;

    }
}