做安卓开发，有很多东西都是像我们在书本中学的公式那样，可以总结出一套共通方法。获取更多共通方法请访问：https://github.com/cnwutianhao/GeneralMethod
欢迎Star、Fork。如有错误请及时纠正，谢谢。
获取当前年月日时分秒
e.g. 2017-05-01 21:37:10
@SuppressLint("SimpleDateFormat")
public static String getCurrentDate_YMDHMS() {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return df.format(new Date());
}
</br>
获取当前月日时分秒
e.g. 05-01 21:37:10
@SuppressLint("SimpleDateFormat")
public static String getCurrentDate_MDHMS() {
SimpleDateFormat mDateFormat = new SimpleDateFormat("MM-dd HH:mm:ss");
return mDateFormat.format(new Date());
}
</br>
获取当前年月日
e.g. 2017-05-01
@SuppressLint("SimpleDateFormat")
public static String getCurrentDate_YMD() {
SimpleDateFormat mDateFormat = new SimpleDateFormat("yyyy-MM-dd");
return mDateFormat.format(new Date());
}
</br>
获取当前月日
e.g. 05-01
@SuppressLint("SimpleDateFormat")
public static String getCurrentDate_MD(Date date) {
SimpleDateFormat mDateFormat = new SimpleDateFormat("MM-dd");
return mDateFormat.format(date);
}
</br>
获取明天日期
e.g. 20170502
public static String getTomorrowDate() {
SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
return String.valueOf(Integer.valueOf(df.format(new Date())) + 1);
}
</br>
获取当前日期字符串
e.g. 20170501
public static String getCurrentDateString() {
SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");
return df.format(new Date());
}
</br>
获取当前是哪一年份
e.g. 2017
public static int getCurrentYear() {
Calendar cal = Calendar.getInstance();
return cal.get(Calendar.YEAR);
}
或
public static int getCurrentYear(long mills) {
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(mills);
return calendar.get(Calendar.YEAR);
}
</br>
获取当前是哪一月份
e.g. 05
public static int getCurrentMonth() {
Calendar cal = Calendar.getInstance();
return cal.get(Calendar.MONTH);
}
或
public static int getCurrentMonth(long mills) {
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(mills);
return calendar.get(Calendar.MONTH) + 1;
}
</br>
获取当前是哪一天
e.g. 01
public static int getCurrentDay() {
Calendar cal = Calendar.getInstance();
return cal.get(Calendar.DATE);
}
</br>
切割标准时间
public static String subStandardTime(String time) {
int idx = time.indexOf(".");
if (idx > 0) {
return time.substring(0, idx).replace("T", " ");
}
return null;
}
</br>
将时间戳转化为字符串
public static String formatTimeToString(long showTime) {
return formatTimeToString(showTime, false);
}
public static String formatTimeToString(long showTime, boolean haveYear) {
String str = "";
long distance = currentTimeMillis() / 1000 - showTime;
if (distance < 300) {
str = "刚刚";
} else if (distance >= 300 && distance < 600) {
str = "5分钟前";
} else if (distance >= 600 && distance < 1200) {
str = "10分钟前";
} else if (distance >= 1200 && distance < 1800) {
str = "20分钟前";
} else if (distance >= 1800 && distance < 2700) {
str = "半小时前";
} else if (distance >= 2700) {
Date date = new Date(showTime * 1000);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
str = formatDateTime(sdf.format(date), haveYear);
}
return str;
}
public static String formatDateTime(String time, boolean haveYear) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
if (time == null) {
return "";
}
Date date;
try {
date = format.parse(time);
} catch (ParseException e) {
e.printStackTrace();
return "";
}
Calendar current = Calendar.getInstance();
Calendar today = Calendar.getInstance();
today.set(Calendar.YEAR, current.get(Calendar.YEAR));
today.set(Calendar.MONTH, current.get(Calendar.MONTH));
today.set(Calendar.DAY_OF_MONTH, current.get(Calendar.DAY_OF_MONTH));
today.set(Calendar.HOUR_OF_DAY, 0);
today.set(Calendar.MINUTE, 0);
today.set(Calendar.SECOND, 0);
Calendar yesterday = Calendar.getInstance();
yesterday.set(Calendar.YEAR, current.get(Calendar.YEAR));
yesterday.set(Calendar.MONTH, current.get(Calendar.MONTH));
yesterday.set(Calendar.DAY_OF_MONTH, current.get(Calendar.DAY_OF_MONTH) - 1);
yesterday.set(Calendar.HOUR_OF_DAY, 0);
yesterday.set(Calendar.MINUTE, 0);
yesterday.set(Calendar.SECOND, 0);
current.setTime(date);
if (current.after(today)) {
return "今天 " + time.split(" ")[1];
} else if (current.before(today) && current.after(yesterday)) {
return "昨天 " + time.split(" ")[1];
} else {
if (haveYear) {
int index = time.indexOf(" ");
return time.substring(0, index);
} else {
int yearIndex = time.indexOf("-") + 1;
int index = time.indexOf(" ");
return time.substring(yearIndex, time.length()).substring(0, index);
}
}
}
</br>
将日期转化成字符串
public static String formatDateToString(String time) {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
if (time == null) {
return "未知";
}
try {
long createTime = format.parse(time).getTime() / 1000;
long currentTime = System.currentTimeMillis() / 1000;
if (currentTime - createTime - 24 * 3600 > 0) { //超出一天
return (currentTime - createTime) / (24 * 3600) + "天前";
} else {
return (currentTime - createTime) / 3600 + "小时前";
}
} catch (ParseException e) {
e.printStackTrace();
}
return "未知";
}
</br>
判断当前日期是星期几
public static String dayForWeek(String pTime) throws Exception {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
c.setTime(format.parse(pTime));
int dayForWeek;
String week = "";
dayForWeek = c.get(Calendar.DAY_OF_WEEK);
switch (dayForWeek) {
case 1:
week = "星期日";
break;
case 2:
week = "星期一";
break;
case 3:
week = "星期二";
break;
case 4:
week = "星期三";
break;
case 5:
week = "星期四";
break;
case 6:
week = "星期五";
break;
case 7:
week = "星期六";
break;
}
return week;
}
或
public static int getWeek(long mills) {
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(mills);
return calendar.get(Calendar.DAY_OF_WEEK) - 1;
}
(0-周日,1-周一，2-周二，3-周三，4-周四，5-周五，6-周六)
</br>
判断是否是今天
public static boolean isToday(long timeInMills) {
String dest = getYmd(timeInMills);
String now = getYmd(Calendar.getInstance().getTimeInMillis());
return dest.equals(now);
}
</br>
判断是否是同一天
public static boolean isSameDay(long aMills, long bMills) {
String aDay = getYmd(aMills);
String bDay = getYmd(bMills);
return aDay.equals(bDay);
}
</br>
获取月份的天数
public static int getDaysInMonth(long mills) {
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(mills);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
switch (month) {
case Calendar.JANUARY:
case Calendar.MARCH:
case Calendar.MAY:
case Calendar.JULY:
case Calendar.AUGUST:
case Calendar.OCTOBER:
case Calendar.DECEMBER:
return 31;
case Calendar.APRIL:
case Calendar.JUNE:
case Calendar.SEPTEMBER:
case Calendar.NOVEMBER:
return 30;
case Calendar.FEBRUARY:
return (year % 4 == 0) ? 29 : 28;
default:
throw new IllegalArgumentException("Invalid Month");
}
}
</br>
获取当月第一天的时间（毫秒值）
public static long getFirstOfMonth(long mills) {
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(mills);
calendar.set(Calendar.DAY_OF_MONTH, 1);
return calendar.getTimeInMillis();
}
</br>
这里呢，还有一种获取年月日时分秒的方法：
private static SimpleDateFormat m = new SimpleDateFormat("MM", Locale.getDefault());
private static SimpleDateFormat d = new SimpleDateFormat("dd", Locale.getDefault());
private static SimpleDateFormat md = new SimpleDateFormat("MM-dd", Locale.getDefault());
private static SimpleDateFormat ymd = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
private static SimpleDateFormat ymdDot = new SimpleDateFormat("yyyy.MM.dd", Locale.getDefault());
private static SimpleDateFormat ymdhms = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
private static SimpleDateFormat ymdhmss = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", Locale.getDefault());
private static SimpleDateFormat ymdhm = new SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.getDefault());
private static SimpleDateFormat hm = new SimpleDateFormat("HH:mm", Locale.getDefault());
private static SimpleDateFormat mdhm = new SimpleDateFormat("MM月dd日 HH:mm", Locale.getDefault());
private static SimpleDateFormat mdhmLink = new SimpleDateFormat("MM-dd HH:mm", Locale.getDefault());
public static String getYmdDot(long timeInMills) {
return ymdDot.format(new java.util.Date(timeInMills));
}
public static String getYmdhms(long timeInMills) {
return ymdhms.format(new java.util.Date(timeInMills));
}
public static String getYmdhmsS(long timeInMills) {
return ymdhmss.format(new java.util.Date(timeInMills));
}
public static String getYmdhm(long timeInMills) {
return ymdhm.format(new java.util.Date(timeInMills));
}
public static String getHm(long timeInMills) {
return hm.format(new java.util.Date(timeInMills));
}
public static String getMd(long timeInMills) {
return md.format(new java.util.Date(timeInMills));
}
public static String getMdhm(long timeInMills) {
return mdhm.format(new java.util.Date(timeInMills));
}
public static String getMdhmLink(long timeInMills) {
return mdhmLink.format(new java.util.Date(timeInMills));
}
public static String getM(long timeInMills) {
return m.format(new java.util.Date(timeInMills));
}
public static String getD(long timeInMills) {
return d.format(new java.util.Date(timeInMills));
}
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