在首选项活动中更新Android语言

Question

在我的安卓应用中，我有一个偏好设置活动，让用户可以覆盖应用的语言。为了实现这一点，我在每个活动的onResume()函数中调用此函数，然后重置内容视图：

    public static void checkOverrideSystemLanguage(Context context) {
    SharedPreferences prefs = PreferenceManager
            .getDefaultSharedPreferences(context);

    // Check if system's language setting needs to be overridden
    boolean overrideSystemLanguage = prefs.getBoolean(context
            .getString(R.string.pref_key_chkbx_override_system_language),
            false);

    if (overrideSystemLanguage) {

        // Get language selection and possible languages
        String localeString = prefs.getString(
                context.getString(R.string.pref_key_list_languages), "");
        List<String> possibleLanguages = Arrays.asList(context
                .getResources().getStringArray(
                        R.array.pref_values_list_languages));

        if (possibleLanguages.contains(localeString)) {

            // Change language setting in configuration
            Locale locale = new Locale(localeString);
            Locale.setDefault(locale);
            Configuration config = new Configuration();
            config.locale = locale;
            context.getResources().updateConfiguration(config,
                    context.getResources().getDisplayMetrics());
        }
        // Use default language
        else {
            overrideSystemLanguage = false;
        }
    }

    // Use default language
    if (!overrideSystemLanguage) {
        context.getResources().updateConfiguration(
                Resources.getSystem().getConfiguration(),
                context.getResources().getDisplayMetrics());
    }
}

在任何活动中，它都能完美运行。然而，在偏好设置活动中，在用户更改语言时，它不会立即更新，因为没有 setContentView() 方法。用户必须返回到上一个活动并重新启动偏好设置活动才能看到语言更改的反映。

我在 onPreferenceChange() 监听器中尝试了以下操作：

1. Updating the configuration, removing and readding the preferences:

   checkOverrideSystemLanguage(this);      
   // Remove all preferences and add them to update the language
   getPreferenceScreen().removeAll();
   addPreferencesFromResource(R.xml.preferences);
   

2. Updating the configuration and calling onCreate(null)

3. Finishing and restarting the activity

   finish();
   startActivity(new Intent(this, PreferencesActivity.class));
   

感谢您的帮助！

- Oliver

---

你可以使用一个小技巧，在某个方法中调用getActionBar().setTitle("your title")来设置标题。 - Martin Ch

Answer 1

我有类似的问题，我是这样解决的（就像你说的：结束并重新启动活动）。它有效！

    public class OptionsActivity extends PreferenceActivity implements YesNoDialogPreference.YesNoDialogListener, SharedPreferences.OnSharedPreferenceChangeListener {

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

        //Options Setting
        final SharedPreferences prefs = getSharedPreferences(OptionsUtility.PREFERENCE_NAME, MODE_PRIVATE);
        String language = prefs.getString(OptionsUtility.PREFERENCE_LANGUAGE, OptionsUtility.DEFAULT_LANGUAGE);

        //Update locale
        OptionsUtility.updateLanguage(this, language);
        prefs.registerOnSharedPreferenceChangeListener(this);

        getPreferenceManager().setSharedPreferencesMode(MODE_PRIVATE);
        getPreferenceManager().setSharedPreferencesName(OptionsUtility.PREFERENCE_NAME);

        // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.preferences);

        Preference eraseGameButton = getPreferenceManager().findPreference(OptionsUtility.PREFERENCE_ERASE_GAME);
        if (eraseGameButton != null) {
            YesNoDialogPreference yesNo = (YesNoDialogPreference)eraseGameButton;
            yesNo.setListener(this);
        }

        Preference configureKeyboardPref = getPreferenceManager().findPreference("keyconfig");
        if (configureKeyboardPref != null) {
            //KeyboardConfigDialogPreference config = (KeyboardConfigDialogPreference)configureKeyboardPref;
            //config.setPrefs(getSharedPreferences(MemodroidCoreActivity.PREFERENCE_NAME, MODE_PRIVATE));
            //config.setContext(this);
        }

    }


    public void onDialogClosed(boolean positiveResult) {
        if (positiveResult) {
            DatabaseScoreManager dbsManager = new DatabaseScoreManager(getApplicationContext());
            dbsManager.resetHighScores();
            Toast.makeText(this, R.string.toast_highScoresReset,Toast.LENGTH_SHORT).show();
        }
    }


    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key) {
        restartActivity();
    }

    @Override
    protected void onStop() {
        super.onStop();
        getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
    }

    private void restartActivity() {
        Intent intent = getIntent();
        finish();
        startActivity(intent);
    }

    @Override
    public void onBackPressed() {
        finish();
    }
}

- Cisco