Android开发中常用到的一些工具类整理
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http://blog.csdn.net/xiaxiazaizai01/article/details/52102747
在开发过程中我们为了代码简单重用，常常会对经常用的方法进行一下简单封装，方便下次使用。下面就分享一下开发中常用的一些工具类的整理。
时间工具类
/**
* 日期操作的工具类
*/
public class DateUtil {
private DateUtil(){
}
/**
* 初始化一些时间设置格式
*/
public static final SimpleDateFormat FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA);
public static final SimpleDateFormat FORMAT_DATE = new SimpleDateFormat("yyyy-MM-dd",Locale.CHINA);
public static final SimpleDateFormat FORMAT_TIME = new SimpleDateFormat("HH:mm",Locale.CHINA);
private static final Calendar INSTANCE = Calendar.getInstance();
public static int getYear(){
return INSTANCE.get(Calendar.YEAR);
}
public static int getMonth(){
return INSTANCE.get(Calendar.MONTH);
}
public static int getDay(){
return INSTANCE.get(Calendar.DAY_OF_MONTH);
}
public static int getHours(){
return INSTANCE.get(Calendar.HOUR_OF_DAY);
}
public static int getMinutes(){
return INSTANCE.get(Calendar.MINUTE);
}
public static int getSeconds(){
return INSTANCE.get(Calendar.SECOND);
}
/**
* 获取N天前、N天后的 日期
*
* @param nowDate
* 当前日期;
* @param dayAddNum
* 正数：N天前，负数：N天后;
* @return
*/
public static Date getAddDay(Date nowDate, int dayAddNum) {
Calendar tday = new GregorianCalendar();
tday.setTime(nowDate);
tday.add(Calendar.DAY_OF_MONTH, dayAddNum);
Date preDate = tday.getTime();
return preDate;
}
/**
* 获取N天前、N天后的 日期
* @param nowDate 当前时间戳;
* @param dayAddNum 正数：N天前，负数：N天后;
* @return
*/
public static Date getAddDay(long nowDate, int dayAddNum){
return getAddDay(new Date(nowDate), dayAddNum);
}
/**
* 时间格式化
* @param format
* @param time
* @return
*/
public static String formatDate(String format,Long time) {
return formatDate(new SimpleDateFormat(format, Locale.CHINA), time);
}
/**
* 时间格式化
* @param format
* @param time
* @return
*/
public static String formatDate(SimpleDateFormat format,Long time) {
if(null==time || time<=0) return "";
return format.format(new Date(String.valueOf(time).length() == 13 ? time : time * 1000));
}
/**
* 将秒转换为（ 分：秒 格式）
* @param time 单位：秒
* @return
*/
public static String getTimeFromInt(int time) {
if (time <= 0) return "00:00";
int secondnd = time / 60;
int million = time % 60;
String f = secondnd >= 10 ? String.valueOf(secondnd) : "0" + String.valueOf(secondnd);
String m = million >= 10 ? String.valueOf(million) : "0" + String.valueOf(million);
return f + ":" + m;
}
/**
* 根据月份获得最大天数
* @param year 年
* @param month 月
* @return 最大天数
*/
public static int getMaxDayByMonth(int year,int month){
Calendar time=Calendar.getInstance();//使用默认时区和语言环境获得一个日历
//注意：在使用set方法之前，必须先调用clear（），否则很多信息会继承自系统当前的时间
time.clear();
time.set(Calendar.YEAR,year);
time.set(Calendar.MONTH,month);//注意Calendar对象默认一月是为零的
int day=time.getActualMaximum(Calendar.DAY_OF_MONTH);//获得本月份的天数
return day;
}
/**
* 根据日期获得星期
*/
public static String getWeek(Date d) {
final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五","星期六" };
Calendar calendar = Calendar.getInstance();
calendar.setTime(d);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (dayOfWeek < 0)
dayOfWeek = 0;
return (dayNames[dayOfWeek]);
}
/**
* 时间格式化（刚刚、几分钟前、几小时前、昨天、前天、年-月-日）
* @param time
* @return
*/
public static String getShortTime(long time) {
String shortstring = "";
if (time == 0)
return shortstring;
long now = Calendar.getInstance().getTimeInMillis();
long datetime = (now - time) / 1000;
if (datetime > 365 * 24 * 60 * 60) {
shortstring = FORMAT_DATE.format(new Date(time));
} else if (datetime > 24 * 60 * 60 && ((int) (datetime / (24 * 60 * 60)))==2){
shortstring = "前天";
} else if (datetime > 24 * 60 * 60 && ((int) (datetime / (24 * 60 * 60)))==1){
shortstring = "昨天";
} else if (datetime > 60 * 60) {
shortstring = (int) (datetime / (60 * 60)) + "小时前";
} else if (datetime > 60) {
shortstring = (int) (datetime / (60)) + "分钟前";
} else {
shortstring = "刚刚";
}
return shortstring;
}
/**
* 时间格式化(秒，分，小时，天)
* @param time
* @return
*/
public static String getShortTime2(long time) {
String shortstring = "";
if (time == 0)
return shortstring;
long now = Calendar.getInstance().getTimeInMillis();
long datetime = (now - time) / 1000; // 秒
if (datetime > 24 * 60 * 60) {
shortstring = (int) (datetime / (24 * 60 * 60)) + "天";
} else if (datetime > 60 * 60) {
shortstring = (int) (datetime / (60 * 60)) + "小时";
} else if (datetime > 60) {
shortstring = (int) (datetime / (60)) + "分钟";
} else {
shortstring = (int) datetime + "秒";
}
return shortstring;
}
/**
* 获取当前日期上一周的开始日期 （周日）
*/
public static String previousWeekByDate(String date) {
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(4, 6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if (1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - s);//根据日历的规则，给当前日期减往星期几与一个星期第一天的差值
cal.add(Calendar.WEEK_OF_YEAR, -1);
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
/**
* 获取当前日期上一周的结束日期 （周六）
*/
public static String previousWeekEndDayByDate(String date) {
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(4, 6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if (1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek() + (6 - s));
cal.add(Calendar.WEEK_OF_YEAR, -1);
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
/**
* 获取当前日期当前一周的开始日期 （周日）
*/
public static String getCurrentWeekFirstDayByDate(String date) {
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(4, 6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if (1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - s);//根据日历的规则，给当前日期减往星期几与一个星期第一天的差值
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
/**
* 获取当前日期当前一周的结束日期 （周六）
*/
public static String getCurrentWeekEndDayByDate(String date) {
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(4, 6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, day);
Date newdate = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
if (1 == dayWeek) {
cal.add(Calendar.DAY_OF_MONTH, -1);
}
cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
cal.add(Calendar.DATE, cal.getFirstDayOfWeek() + (6 - s));
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
/**
* 返回上一个月的第一天
*
* @return 20120201
*/
public static String previousMonthByDate(String date) {
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(4, 6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 2, 1);
Date newdate = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
/**
* 返回下一个月的第一天
*
* @return 20120401
*/
public static String nextMonthByDate(String date) {
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(4, 6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month, 1);
Date newdate = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
/**
* 返回当前月的第一天
*
* @return 20120101
*/
public static String getCurrentMonthFirstDayByDate(String date) {
int year = Integer.parseInt(date.substring(0, 4));
int month = Integer.parseInt(date.substring(4, 6));
int day = Integer.parseInt(date.substring(6));
Calendar calendar = Calendar.getInstance();
calendar.set(year, month - 1, 1);
Date newdate = calendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
Calendar cal = Calendar.getInstance();
cal.setTime(newdate);
String imptimeBegin = sdf.format(cal.getTime());
return imptimeBegin;
}
}