Android(安卓)时间日期时区

日期时间

private void setTime( int hourOfDay, int minute) {
Calendar c = Calendar.getInstance();

        c.set(Calendar.HOUR_OF_DAY, hourOfDay);
        c.set(Calendar.MINUTE, minute);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        long when = c.getTimeInMillis();

        if (when / 1000 < Integer.MAX_VALUE) {
            ((AlarmManager) getSystemService(Context.ALARM_SERVICE)).setTime(when);
        }
    }


    private void setDate(int year, int month, int day) {
        Calendar c = Calendar.getInstance();

        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, month);
        c.set(Calendar.DAY_OF_MONTH, day);
        long when = c.getTimeInMillis();

        if (when / 1000 < Integer.MAX_VALUE) {
            ((AlarmManager) getSystemService(Context.ALARM_SERVICE)).setTime(when);
        }
    }

需要注意Calendar.MONTH 比实际月份小1,比如1月值是0

时区

    public static String getTimeZoneText(TimeZone tz, boolean includeName) {
        Date now = new Date();

        // Use SimpleDateFormat to format the GMT+00:00 string.
        SimpleDateFormat gmtFormatter = new SimpleDateFormat("ZZZZ");
        gmtFormatter.setTimeZone(tz);
        String gmtString = gmtFormatter.format(now);

        // Ensure that the "GMT+" stays with the "00:00" even if the digits are RTL.
        BidiFormatter bidiFormatter = BidiFormatter.getInstance();
        Locale l = Locale.getDefault();
        boolean isRtl = TextUtils.getLayoutDirectionFromLocale(l) == View.LAYOUT_DIRECTION_RTL;
        gmtString = bidiFormatter.unicodeWrap(gmtString,
                isRtl ? TextDirectionHeuristics.RTL : TextDirectionHeuristics.LTR);

        if (!includeName) {
            return gmtString;
        }

        // Optionally append the time zone name.
        SimpleDateFormat zoneNameFormatter = new SimpleDateFormat("zzzz");
        zoneNameFormatter.setTimeZone(tz);
        String zoneNameString = zoneNameFormatter.format(now);

        // We don't use punctuation here to avoid having to worry about localizing that too!
        return gmtString + " " + zoneNameString;
    }


    static class ZoneGetter {
        private final List> mZones =
                new ArrayList>();
        private final HashSet mLocalZones = new HashSet();
        private final Date mNow = Calendar.getInstance().getTime();
        private final SimpleDateFormat mZoneNameFormatter = new SimpleDateFormat("zzzz");

        private List> getZones(Context context) {
            for (String olsonId : TimeZoneNames.forLocale(Locale.getDefault())) {
                mLocalZones.add(olsonId);
            }
            try {
                XmlResourceParser xrp = context.getResources().getXml(R.xml.timezones);
                while (xrp.next() != XmlResourceParser.START_TAG) {
                    continue;
                }
                xrp.next();
                while (xrp.getEventType() != XmlResourceParser.END_TAG) {
                    while (xrp.getEventType() != XmlResourceParser.START_TAG) {
                        if (xrp.getEventType() == XmlResourceParser.END_DOCUMENT) {
                            return mZones;
                        }
                        xrp.next();
                    }
                    if (xrp.getName().equals(XMLTAG_TIMEZONE)) {
                        String olsonId = xrp.getAttributeValue(0);
                        addTimeZone(olsonId);
                    }
                    while (xrp.getEventType() != XmlResourceParser.END_TAG) {
                        xrp.next();
                    }
                    xrp.next();
                }
                xrp.close();
            } catch (XmlPullParserException xppe) {
                Log.e(TAG, "Ill-formatted timezones.xml file");
            } catch (java.io.IOException ioe) {
                Log.e(TAG, "Unable to read timezones.xml file");
            }
            return mZones;
        }

        private void addTimeZone(String olsonId) {
            // We always need the "GMT-07:00" string.
            final TimeZone tz = TimeZone.getTimeZone(olsonId);

            // For the display name, we treat time zones within the country differently
            // from other countries' time zones. So in en_US you'd get "Pacific Daylight Time"
            // but in de_DE you'd get "Los Angeles" for the same time zone.
            String displayName;
            if (mLocalZones.contains(olsonId)) {
                // Within a country, we just use the local name for the time zone.
                mZoneNameFormatter.setTimeZone(tz);
                displayName = mZoneNameFormatter.format(mNow);
            } else {
                // For other countries' time zones, we use the exemplar location.
                final String localeName = Locale.getDefault().toString();
                displayName = TimeZoneNames.getExemplarLocation(localeName, olsonId);
            }

            final HashMap map = new HashMap();
            map.put(KEY_ID, olsonId);
            map.put(KEY_DISPLAYNAME, displayName);
            map.put(KEY_GMT, getTimeZoneText(tz, false));
            map.put(KEY_OFFSET, tz.getOffset(mNow.getTime()));

            mZones.add(map);
        }
    }

    private static class MyComparator implements Comparator> {
        private String mSortingKey;

        public MyComparator(String sortingKey) {
            mSortingKey = sortingKey;
        }

        public void setSortingKey(String sortingKey) {
            mSortingKey = sortingKey;
        }

        public int compare(HashMap<?, ?> map1, HashMap<?, ?> map2) {
            Object value1 = map1.get(mSortingKey);
            Object value2 = map2.get(mSortingKey);

            /*
             * This should never happen, but just in-case, put non-comparable
             * items at the end.
             */
            if (!isComparable(value1)) {
                return isComparable(value2) ? 1 : 0;
            } else if (!isComparable(value2)) {
                return -1;
            }

return ((Comparable) value1).compareTo(value2);
}

        private boolean isComparable(Object value) {
            return (value != null) && (value instanceof Comparable);
        }
    }

设置时区

AlarmManager alarm = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarm.setTimeZone(tzId);

时区timezones.xml文件

    Manila

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