Android之日期时间格式的实现方法

final Context context, final long time, final boolean simple,

Locale locale) {

final GregorianCalendar now = new GregorianCalendar();

// special time

if (time < MILLSECONDS_OF_HOUR) {

return "";

}

// today

final GregorianCalendar today = new GregorianCalendar(

now.get(GregorianCalendar.YEAR),

now.get(GregorianCalendar.MONTH),

now.get(GregorianCalendar.DAY_OF_MONTH));

final long in24h = time - today.getTimeInMillis();

if (in24h > 0 && in24h <= MILLSECONDS_OF_DAY) {

java.text.DateFormat df = java.text.DateFormat.getTimeInstance(

java.text.DateFormat.SHORT, locale);

return "" + df.format(time);

}

// yesterday

final long in48h = time - today.getTimeInMillis() + MILLSECONDS_OF_DAY;

if (in48h > 0 && in48h <= MILLSECONDS_OF_DAY) {

return simple ? context.getString(R.string.fmt_pre_yesterday)

: context.getString(R.string.fmt_pre_yesterday)

+ " "

+ java.text.DateFormat.getTimeInstance(

java.text.DateFormat.SHORT, locale).format(

time);

}

final GregorianCalendar target = new GregorianCalendar();

target.setTimeInMillis(time);

// same week

if (now.get(GregorianCalendar.YEAR) == target

.get(GregorianCalendar.YEAR)

&& now.get(GregorianCalendar.WEEK_OF_YEAR) == target

.get(GregorianCalendar.WEEK_OF_YEAR)) {

java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("E", locale);

final String dow = "" + sdf.format(time);

return simple ? dow : dow

+ java.text.DateFormat.getTimeInstance(

java.text.DateFormat.SHORT, locale).format(time);

}

// same year

if (now.get(GregorianCalendar.YEAR) == target

.get(GregorianCalendar.YEAR)) {

return simple ? java.text.DateFormat.getDateInstance(

java.text.DateFormat.SHORT, locale).format(time)

: java.text.DateFormat.getDateTimeInstance(

java.text.DateFormat.SHORT,

java.text.DateFormat.SHORT, locale).format(time);

}

return simple ? java.text.DateFormat.getDateInstance(

java.text.DateFormat.SHORT, locale).format(time)

: java.text.DateFormat.getDateTimeInstance(

java.text.DateFormat.SHORT, java.text.DateFormat.SHORT,

locale).format(time);

}