在android studio中更改应用程序的语言

Question

我在更改应用程序中的语言时遇到一些问题，我不知道为什么它不起作用，没有错误，请检查日志是否全部清除。我希望我的应用程序具有西班牙语和英语。我已经创建了用于西班牙文的strings.xml，并设置了LocaleHelper，还创建了包含覆盖方法“ attachBaseContext”的应用程序类，但仍然无法正常工作...

我的语言环境助手

public class LocaleHelper {

private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";

public static Context onAttach(Context context) {
    String lang = getPersistedData(context, Locale.getDefault().getLanguage());
    return setLocale(context, lang);
}

public static Context onAttach(Context context, String defaultLanguage) {
    String lang = getPersistedData(context, defaultLanguage);
    return setLocale(context, lang);
}

public static String getLanguage(Context context) {
    return getPersistedData(context, Locale.getDefault().getLanguage());
}

public static Context setLocale(Context context, String language) {
    persist(context, language);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        return updateResources(context, language);
    }

    return updateResourcesLegacy(context, language);
}

private static String getPersistedData(Context context, String defaultLanguage) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
}

private static void persist(Context context, String language) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = preferences.edit();

    editor.putString(SELECTED_LANGUAGE, language);
    editor.apply();
}

@TargetApi(Build.VERSION_CODES.N)
private static Context updateResources(Context context, String language) {
    Locale locale = new Locale(language);
    Locale.setDefault(locale);

    Configuration configuration = context.getResources().getConfiguration();
    configuration.setLocale(locale);

    return context.createConfigurationContext(configuration);
}

@SuppressWarnings("deprecation")
private static Context updateResourcesLegacy(Context context, String language) {
    Locale locale = new Locale(language);
    Locale.setDefault(locale);

    Resources resources = context.getResources();

    Configuration configuration = resources.getConfiguration();
    configuration.locale = locale;

    resources.updateConfiguration(configuration, resources.getDisplayMetrics());

    return context;
}

}

我的string.xml夹心翻译成西班牙语

<resources>
<string name="item1">Leer Mas Tarde</string>
<string name="item2">Ajustes</string>
<string name="item3">Acerca De</string>
<string name="item4">Términos y Condiciones</string>
<string name="read_later">Leer Mas Tarde</string>
<string name="delete">Borrar</string>
<string name="feedback">Realimentación</string>
<string name="change_language">Cambiar Idioma</string>

我的扩展应用程序的应用程序类

public class App extends Application {
@Override
protected void attachBaseContext(Context base) {
    super.attachBaseContext(LocaleHelper.onAttach(base, "en"));
}

} 这是我的按钮单击，它会打开列出的警报对话框以选择要使用的语言

private void changeLanguage(){
    btn_changelanguage = findViewById(R.id.changelanguage_button);
    btn_changelanguage.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(context);
                    builder.setTitle("Select Language");
                    //add a list
                    builder.setItems(name_languages, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            switch (which){
                                case 0:
                                    LocaleHelper.setLocale(context, "en");
                                    Toast.makeText(context, "English selected", Toast.LENGTH_SHORT).show();
                                    recreate();
                                    break;
                                case 1:
                                    LocaleHelper.setLocale(context, "ca-rES");
                                    Toast.makeText(context, "Spanish selected", Toast.LENGTH_SHORT).show();
                                    recreate();
                                    break;
                            }
                        }
                    }) ;
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }
            }
    );
}

其中name_language是：

String[] name_languages = {"English", "Spanish"};