如何更改以下代码，以支持区域设置

Question

下面的代码片段取自“Udacity Sunshine App”的“Utility.Java”文件。从服务器获取“日期”数据，并以此方式显示。

我想更改android studio中的代码，以支持Locale。最后用不同的语言返回日期和月份的名称。请帮帮我？

static String formatDate(long dateInMilliseconds) {
    Date date = new Date(dateInMilliseconds);
    return DateFormat.getDateInstance().format(date);
}

// Format used for storing dates in the database.  ALso used for converting those strings
// back into date objects for comparison/processing.
public static final String DATE_FORMAT = "yyyyMMdd";

/**
 * Helper method to convert the database representation of the date into something to display
 * to users.  As classy and polished a user experience as "20140102" is, we can do better.
 *
 * @param context Context to use for resource localization
 * @param dateInMillis The date in milliseconds
 * @return a user-friendly representation of the date.
 */
public static String getFriendlyDayString(Context context, long dateInMillis, boolean displayLongToday) {
    // The day string for forecast uses the following logic:
    // For today: "Today, June 8"
    // For tomorrow:  "Tomorrow"
    // For the next 5 days: "Wednesday" (just the day name)
    // For all days after that: "Mon Jun 8"

    Time time = new Time();
    time.setToNow();
    long currentTime = System.currentTimeMillis();
    int julianDay = Time.getJulianDay(dateInMillis, time.gmtoff);
    int currentJulianDay = Time.getJulianDay(currentTime, time.gmtoff);

    // If the date we're building the String for is today's date, the format
    // is "Today, June 24"
    if (displayLongToday && julianDay == currentJulianDay) {
        String today = context.getString(R.string.today);
        int formatId = R.string.format_full_friendly_date;
        return String.format(context.getString(
                formatId,
                today,
                getFormattedMonthDay(context, dateInMillis)));
    } else if ( julianDay < currentJulianDay + 7 ) {
        // If the input date is less than a week in the future, just return the day name.
        return getDayName(context, dateInMillis);
    } else {
        // Otherwise, use the form "Mon Jun 3"
        SimpleDateFormat shortenedDateFormat = new SimpleDateFormat("EEE MMM dd");
        return shortenedDateFormat.format(dateInMillis);
    }
}

/**
 * Helper method to convert the database representation of the date into something to display
 * to users.  As classy and polished a user experience as "20140102" is, we can do better.
 *
 * @param context Context to use for resource localization
 * @param dateInMillis The date in milliseconds
 * @return a user-friendly representation of the date.
 */
public static String getFullFriendlyDayString(Context context, long dateInMillis) {

    String day = getDayName(context, dateInMillis);
    int formatId = R.string.format_full_friendly_date;
    return String.format(context.getString(
            formatId,
            day,
            getFormattedMonthDay(context, dateInMillis)));
}

/**
 * Given a day, returns just the name to use for that day.
 * E.g "today", "tomorrow", "wednesday".
 *
 * @param context Context to use for resource localization
 * @param dateInMillis The date in milliseconds
 * @return
 */
public static String getDayName(Context context, long dateInMillis) {
    // If the date is today, return the localized version of "Today" instead of the actual
    // day name.

    Time t = new Time();
    t.setToNow();
    int julianDay = Time.getJulianDay(dateInMillis, t.gmtoff);
    int currentJulianDay = Time.getJulianDay(System.currentTimeMillis(), t.gmtoff);
    if (julianDay == currentJulianDay) {
        return context.getString(R.string.today);
    } else if ( julianDay == currentJulianDay +1 ) {
        return context.getString(R.string.tomorrow);
    } else {
        Time time = new Time();
        time.setToNow();
        // Otherwise, the format is just the day of the week (e.g "Wednesday".
        SimpleDateFormat dayFormat = new SimpleDateFormat("EEEE");
        return dayFormat.format(dateInMillis);
    }
}

/**
 * Converts db date format to the format "Month day", e.g "June 24".
 * @param context Context to use for resource localization
 * @param dateInMillis The db formatted date string, expected to be of the form specified
 *                in Utility.DATE_FORMAT
 * @return The day in the form of a string formatted "December 6"
 */
public static String getFormattedMonthDay(Context context, long dateInMillis ) {
    Time time = new Time();
    time.setToNow();
    SimpleDateFormat dbDateFormat = new SimpleDateFormat(Utility.DATE_FORMAT);
    SimpleDateFormat monthDayFormat = new SimpleDateFormat("MMMM dd");
    String monthDayString = monthDayFormat.format(dateInMillis);
    return monthDayString;
}

Answer 1

只需将Locale添加到SimpleDateFormat构造函数

即可

SimpleDateFormat dateFormat = new SimpleDateFormat("EEEE  MMM dd", Locale.ENGLISH);
return dateFormat.format(dateInMillis);