Question

我正在开发支持德语和意大利语的双语android应用程序。
目前，我有一个values-it带有意大利字符串，一个values带有德国字符串。除非您在设备上使用德语和意大利语，否则此方法效果很好。在这种情况下，按照以下计算，应用程序始终是意大利语的：

User Setting: de_DE, it_IT
App Resources: default(en), it

Try de_IT -> fail
Try de -> fail
Try it_IT -> fail
Try it -> Success

这可能是因为默认值被隐式地视为values-en，而在我看来，它实际上是values-de。

有没有办法告诉android，我的应用程序的默认语言环境是de而不是en？

Answer 1

我不知道是否还有其他选择，一种方法是以编程方式进行。根据{{3}}，我创建了以下类来更改默认的Local：

public class LocaleHelper {

public static Context onAttach(Context context) {
    String lang = Locale.getDefault().getLanguage();
    if(lang.equals("it") || lang.equals("de"))
        return context;
    String locale = "de";
    return setLocale(context, locale);
}

private static Context setLocale(Context context, String localeSpec) {
    Locale locale;
    if (localeSpec.equals("system")) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            locale = Resources.getSystem().getConfiguration().getLocales().get(0);
        } else {
            locale = Resources.getSystem().getConfiguration().locale;
        }
    } else {
        locale = new Locale(localeSpec);
    }
    Locale.setDefault(locale);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        return updateResources(context, locale);
    } else {
        return updateResourcesLegacy(context, locale);
    }
}

@TargetApi(Build.VERSION_CODES.N)
private static Context updateResources(Context context, Locale locale) {
    Configuration configuration = context.getResources().getConfiguration();
    configuration.setLocale(locale);
    configuration.setLayoutDirection(locale);

    return context.createConfigurationContext(configuration);
}

@SuppressWarnings("deprecation")
private static Context updateResourcesLegacy(Context context, Locale locale) {
    Resources resources = context.getResources();

    Configuration configuration = resources.getConfiguration();
    configuration.locale = locale;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        configuration.setLayoutDirection(locale);
    }

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

    return context;
}
}

您应该在Activity类中使用它：

@Override
protected void attachBaseContext(Context base) {
    super.attachBaseContext(LocaleHelper.onAttach(base));
}

如果您使用uk.co.chrisjenx.calligraphy更改字体，则应执行以下操作：

@Override
protected void attachBaseContext(Context base) {
    super.attachBaseContext(CalligraphyContextWrapper.wrap(LocaleHelper.onAttach(base)));
}

更新

使用出色的Ricardo's great solution，我设法自动找到了提供的语言。因此，每当您向资源中添加新的翻译时，您都无需再对it，de或其他提供的翻译进行硬编码。

public class LocaleHelper {

public static Context onAttach(Activity context) {
    Set<String> providedLangs = getProvidedLanguages(context);
    String lang = Locale.getDefault().getLanguage();
    if(providedLangs.contains(lang))
        return context;
    String locale = "de";
    return setLocale(context, locale);
}

private static Set<String> getProvidedLanguages(Activity activity){
    DisplayMetrics metrics = new DisplayMetrics();
    activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
    Resources r = activity.getResources();
    Configuration c = r.getConfiguration();
    String[] loc = r.getAssets().getLocales();
    Set<String> providedLangs = new HashSet<String>();
    for (int i = 0; i < loc.length; i++) {
        Timber.e("LOCALE: " +  i + ": " + loc[i]);

        c.locale = new Locale(loc[i]);
        Resources res = new Resources(activity.getAssets(), metrics, c);
        String s1 = res.getString(R.string.app_name);
        c.locale = new Locale("");
        Resources res2 = new Resources(activity.getAssets(), metrics, c);
        String s2 = res2.getString(R.string.app_name);

        if(!s1.equals(s2)){
            if(!providedLangs.contains(loc[i]))
                providedLangs.add(loc[i]);
        }
    }

    return providedLangs;
}

private static Context setLocale(Context context, String localeSpec) {
    Locale locale;
    if (localeSpec.equals("system")) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            locale = Resources.getSystem().getConfiguration().getLocales().get(0);
        } else {
            locale = Resources.getSystem().getConfiguration().locale;
        }
    } else {
        locale = new Locale(localeSpec);
    }
    Locale.setDefault(locale);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        return updateResources(context, locale);
    } else {
        return updateResourcesLegacy(context, locale);
    }
}

@TargetApi(Build.VERSION_CODES.N)
private static Context updateResources(Context context, Locale locale) {
    Configuration configuration = context.getResources().getConfiguration();
    configuration.setLocale(locale);
    configuration.setLayoutDirection(locale);

    return context.createConfigurationContext(configuration);
}

@SuppressWarnings("deprecation")
private static Context updateResourcesLegacy(Context context, Locale locale) {
    Resources resources = context.getResources();

    Configuration configuration = resources.getConfiguration();
    configuration.locale = locale;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        configuration.setLayoutDirection(locale);
    }

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

    return context;
}
}

Answer 2

20210715 这似乎对我有用。专注于标识语言环境并认识到必须提供上下文的语句

///this function was called from a FRAGMENT and works fine .
////  dateLong = TimeConvert.tcConvertDateToLong(..........,requireContext()
fun tcConvertDateToLong(
        yyyy: Int, MM: Int, dd: Int, HH: Int, mm: Int,context: Context
): Long {
    val mTag64="TimeConvert_tcConvertDateToLong"
    val date:String
    date=yyyy.toString() + "." + MM.toString() + "."+ dd.toString() +" "+ HH.toString() + ":" + mm.toString()
    ////////////-------------------------------------------------------------
    val locale = getLocales(context.getResources().getConfiguration()).get(0)
    //////////-------------------------------------------------------------
    val df = SimpleDateFormat("yyyy.MM.dd HH:mm",locale)
    return try {
        df.parse(date)!!.time
    }  catch (  e: ParseException){
        java.lang.System.currentTimeMillis()
    }
}

Android-定义默认语言环境

2 个答案:

更新