如果你写

android:configChanges="locale"

在每个活动中(在清单文件中)，那么不需要每次输入activity时都设置它。

如果你正在使用片段，并且你想在Android中以编程方式更改应用程序语言，请使用此方法

  public void setLocale(Activity activity, String languageCode) {
    Locale locale = new Locale(languageCode);
    Locale.setDefault(locale);
    Resources resources = activity.getResources();
    Configuration config = resources.getConfiguration();
    config.setLocale(locale);
    resources.updateConfiguration(config, resources.getDisplayMetrics());
     SettingsFragment settingsFragment = new SettingsFragment();
     FragmentManager fragmentManager = requireActivity().getSupportFragmentManager();
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    activity.overridePendingTransition(0,0);
     fragmentTransaction.replace(R.id.main, settingsFragment).commit();
}

这样叫它

setLocale(requireActivity(),"fr");

只需要用你的片段名改变SettingsFragment，在你调用方法的地方，这基本上是刷新布局来获得视图上的新字符串 如果你想在另一个类上设置这个方法只需像这样添加context

public void setLocale(Activity activity, String languageCode,Context context) {
    Locale locale = new Locale(languageCode);
    Locale.setDefault(locale);
    Resources resources = activity.getResources();
    Configuration config = resources.getConfiguration();
    config.setLocale(locale);
    resources.updateConfiguration(config, resources.getDisplayMetrics());
    SettingsFragment settingsFragment = new SettingsFragment();
    FragmentManager fragmentManager = ((AppCompatActivity) context).getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    activity.overridePendingTransition(0,0);
    fragmentTransaction.replace(R.id.main, settingsFragment).commit();
}

阿拉伯语/RTL支持

您必须通过- attachBaseContext()更新您的语言设置。 对于android版本N及以上，您必须使用createconfigationcontext () & updateConfiguration() -否则RTL布局无法正常工作

@Override protected void attachBaseContext(Context newBase) { super.attachBaseContext(updateBaseContextLocale(newBase)); } public Context updateBaseContextLocale(Context context) { String language = SharedPreference.getInstance().getValue(context, "lan");//it return "en", "ar" like this if (language == null || language.isEmpty()) { //when first time enter into app (get the device language and set it language = Locale.getDefault().getLanguage(); if (language.equals("ar")) { SharedPreference.getInstance().save(mContext, "lan", "ar"); } } Locale locale = new Locale(language); Locale.setDefault(locale); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { updateResourcesLocale(context, locale); return updateResourcesLocaleLegacy(context, locale); } return updateResourcesLocaleLegacy(context, locale); } @TargetApi(Build.VERSION_CODES.N) private Context updateResourcesLocale(Context context, Locale locale) { Configuration configuration = context.getResources().getConfiguration(); configuration.setLocale(locale); return context.createConfigurationContext(configuration); } @SuppressWarnings("deprecation") private Context updateResourcesLocaleLegacy(Context context, Locale locale) { Resources resources = context.getResources(); Configuration configuration = resources.getConfiguration(); configuration.locale = locale; resources.updateConfiguration(configuration, resources.getDisplayMetrics()); return context; }

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 ();

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); 
 }