Update ListPreference summary on language change

Question

When a new language is selected in my ListPreference , I change it and reload my Fragment in order to apply it, like such:

 listPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
        @Override
        public boolean onPreferenceChange(Preference preference, Object newValue) {
            // Get selected language
            String selectedLanguage = newValue.toString();
            preference.setSummary(selectedLanguage);

            // Change language
            Locale locale;
            if (selectedLanguage.equals("French")) {
                locale = new Locale("fr");
            } else {
                locale = new Locale("en");
            }
            Locale.setDefault(locale);
            Configuration config = new Configuration();
            config.locale = locale;
            getActivity().getApplicationContext().getResources().updateConfiguration(config, null);

            // Refresh fragment
            getFragmentManager().beginTransaction()
                    .replace(R.id.content_frame, new SettingsFragment())
                    .commit();
            return true;
        }
    });

Per exemple, if French is chosen, it does apply the French language to all of my strings (defines in a strings-fr.xml file) but it does not do so for my ListPreference s summaries (even though they have their translation in the right files).

Two questions:

• Is there a better way to load my language instead of reloading my Fragment ?

• And how may I update my ListPreference s summary to the right language?

Answer 1

Is there a better way to load my language instead of reloading my Fragment?

I think this would be the best way for an immediate load of the new langauage. It may not continue after Activity / Application restart though. In that case, you would need to check the language from SharedPreferences and load it in the Activity / Application onCreate() :

private Locale locale = null;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);

    final Configuration config = getBaseContext().getResources().getConfiguration();
    final String language = PreferenceManager.getDefaultSharedPreferences(this).getString("language", "");
    if (!TextUtils.isEmpty(language) && !config.locale.getLanguage().equals(language))
    {
        locale = new Locale(language);
        setLocale(config);
    }

    setContentView(R.layout.main_activity);
    ...
}

And how may I update my ListPreferences summary to the right language?

Your question is missing XML files but here is how I usually do that and it works just fine for me every time and I don't need to update the summary programmatically:

preferences.xml

<ListPreference
    android:defaultValue="en"
    android:entries="@array/language_names"
    android:entryValues="@array/language_values"
    android:icon="@drawable/ic_language"
    android:key="language"
    android:summary="@string/current_language"
    android:title="@string/language_title"/>

strings.xml

<string-array name="language_names">
    <item>English</item>
    <item>French</item>
</string-array>
<string-array name="language_values">
    <item>en</item>
    <item>fr</item>
</string-array>
<string name="current_language">English</string>

strings-fr.xml

<string-array name="language_names">
    <item>Anglais</item>
    <item>Français</item>
</string-array>
<string name="current_language">Français</string>