Android开发中常用到的一些工具类整理

中常用到的一些工具类整理"/>

Android开发中常用到的一些工具类整理

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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;}
}

最后

后面会持续更新，未完待续….