Android技術精髓-Timing Activity

Android技術精髓-Timing Activity
Timing Activity
顧名思義，在activity中實時通過線程通信顯示當前時間，也是主要用到線程通信的知識,

package com.example.text_1;

import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;

public class TimeingActivity extends Activity {

	TextView mClock;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		mClock = new TextView(this);
		setContentView(mClock);
	}

	private Handler mHandler = new Handler();
	private Runnable timerTask = new Runnable() {
		@Override
		public void run() {
			Calendar now = Calendar.getInstance();
			mClock.setText(String.format("%02d:%02d:%02d",
					now.get(Calendar.HOUR), now.get(Calendar.MINUTE),
					now.get(Calendar.SECOND)));
			mHandler.postDelayed(timerTask, 1000);
		}
	};

	@Override
	public void onResume() {
		super.onResume();
		mHandler.post(timerTask);
	}

	@Override
	public void onPause() {
		super.onPause();
		mHandler.removeCallbacks(timerTask);
	}
}

運行結果，實時顯示目前時間。
當然的，你也可以實時顯示任何變化的東西，時間、倒計時、等等。



關於多線程之Handler 可以看下之前這篇博客：http://blog.csdn.net/zhangtengyuan23/article/details/8862039

Calendar <喎?/kf/ware/vc/" target="_blank" class="keylink">vc3Ryb25nPgo8YnI+CgpDYWxlbmRhcsrH0ru49kRhdGVkYXK21M/zus3Su9fp1fvQzdfWts7I58Tqo6zUwqOsyNWjrNChyrGjrLXI1q685Nequ7u1xLPpz/O7+cDgoaMKyrnTw2NhbGVuZGFyv8nS1Le9seO1xLvxyKHPtc2zv9jWxrXEyM66zsqxvOTP4LnY0MXPoqGjCjxicj4KCkNhbGVuZGFy1MvTw7TzyKujujxicj4KCjxwcmUgY2xhc3M9"brush:java;">public class CalendarUtil { private int weeks = 0;// 用來全局控制 上一周，本周，下一周的周數變化 private int MaxDate; // 一月最大天數 private int MaxYear; // 一年最大天數 public static void main(String[] args) { CalendarUtil tt = new CalendarUtil(); System.out.println("獲取當天日期:" + tt.getNowTime("yyyy-MM-dd")); System.out.println("獲取本周一日期:" + tt.getMondayOFWeek()); System.out.println("獲取本周日的日期:" + tt.getCurrentWeekday()); System.out.println("獲取上周一日期:" + tt.getPreviousWeekday()); System.out.println("獲取上周日日期:" + tt.getPreviousWeekSunday()); System.out.println("獲取下周一日期:" + tt.getNextMonday()); System.out.println("獲取下周日日期:" + tt.getNextSunday()); System.out.println("獲得相應周的周六的日期:" + tt.getNowTime("yyyy-MM-dd")); System.out.println("獲取本月第一天日期:" + tt.getFirstDayOfMonth()); System.out.println("獲取本月最後一天日期:" + tt.getDefaultDay()); System.out.println("獲取上月第一天日期:" + tt.getPreviousMonthFirst()); System.out.println("獲取上月最後一天的日期:" + tt.getPreviousMonthEnd()); System.out.println("獲取下月第一天日期:" + tt.getNextMonthFirst()); System.out.println("獲取下月最後一天日期:" + tt.getNextMonthEnd()); System.out.println("獲取本年的第一天日期:" + tt.getCurrentYearFirst()); System.out.println("獲取本年最後一天日期:" + tt.getCurrentYearEnd()); System.out.println("獲取去年的第一天日期:" + tt.getPreviousYearFirst()); System.out.println("獲取去年的最後一天日期:" + tt.getPreviousYearEnd()); System.out.println("獲取明年第一天日期:" + tt.getNextYearFirst()); System.out.println("獲取明年最後一天日期:" + tt.getNextYearEnd()); System.out.println("獲取本季度第一天:" + tt.getThisSeasonFirstTime(11)); System.out.println("獲取本季度最後一天:" + tt.getThisSeasonFinallyTime(11)); System.out.println("獲取兩個日期之間間隔天數2008-12-1~2008-9.29:" + CalendarUtil.getTwoDay("2008-12-1", "2008-9-29")); System.out.println("獲取當前月的第幾周：" + tt.getWeekOfMonth()); System.out.println("獲取當前年份：" + tt.getYear()); System.out.println("獲取當前月份：" + tt.getMonth()); System.out.println("獲取今天在本年的第幾天：" + tt.getDayOfYear()); System.out.println("獲得今天在本月的第幾天(獲得當前日)：" + tt.getDayOfMonth()); System.out.println("獲得今天在本周的第幾天：" + tt.getDayOfWeek()); System.out.println("獲得半年後的日期：" + tt.convertDateToString(tt.getTimeYearNext())); } public static int getYear() { return Calendar.getInstance().get(Calendar.YEAR); } public static int getMonth() { return Calendar.getInstance().get(Calendar.MONTH) + 1; } public static int getDayOfYear() { return Calendar.getInstance().get(Calendar.DAY_OF_YEAR); } public static int getDayOfMonth() { return Calendar.getInstance().get(Calendar.DAY_OF_MONTH); } public static int getDayOfWeek() { return Calendar.getInstance().get(Calendar.DAY_OF_WEEK); } public static int getWeekOfMonth() { return Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH); } public static Date getTimeYearNext() { Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183); return Calendar.getInstance().getTime(); } public static String convertDateToString(Date dateTime) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); return df.format(dateTime); } public static String getTwoDay(String sj1, String sj2) { SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); long day = 0; try { java.util.Date date = myFormatter.parse(sj1); java.util.Date mydate = myFormatter.parse(sj2); day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); } catch (Exception e) { return ""; } return day + ""; } public static String getWeek(String sdate) { // 再轉換為時間 Date date = CalendarUtil.strToDate(sdate); Calendar c = Calendar.getInstance(); c.setTime(date); // int hour=c.get(Calendar.DAY_OF_WEEK); // hour中存的就是星期幾了，其范圍 1~7 // 1=星期日 7=星期六，其他類推 return new SimpleDateFormat("EEEE").format(c.getTime()); } public static Date strToDate(String strDate) { SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(strDate, pos); return strtodate; } public static long getDays(String date1, String date2) { if (date1 == null || date1.equals("")) return 0; if (date2 == null || date2.equals("")) return 0; // 轉換為標准時間 SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date date = null; java.util.Date mydate = null; try { date = myFormatter.parse(date1); mydate = myFormatter.parse(date2); } catch (Exception e) { } long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); return day; } public String getDefaultDay() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE, 1);// 設為當前月的1號 lastDate.add(Calendar.MONTH, 1);// 加一個月，變為下月的1號 lastDate.add(Calendar.DATE, -1);// 減去一天，變為當月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getPreviousMonthFirst() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE, 1);// 設為當前月的1號 lastDate.add(Calendar.MONTH, -1);// 減一個月，變為下月的1號 // lastDate.add(Calendar.DATE,-1);//減去一天，變為當月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getFirstDayOfMonth() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE, 1);// 設為當前月的1號 str = sdf.format(lastDate.getTime()); return str; } public String getCurrentWeekday() { weeks = 0; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getNowTime(String dateformat) { Date now = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);// 可以方便地修改日期格式 String hehe = dateFormat.format(now); return hehe; } private int getMondayPlus() { Calendar cd = Calendar.getInstance(); // 獲得今天是一周的第幾天，星期日是第一天，星期二是第二天...... int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因為按中國禮拜一作為第一天所以這裡減1 if (dayOfWeek == 1) { return 0; } else { return 1 - dayOfWeek; } } public String getMondayOFWeek() { weeks = 0; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getSaturday() { int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getPreviousWeekSunday() { weeks = 0; weeks--; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getPreviousWeekday() { weeks--; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getNextMonday() { weeks++; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getNextSunday() { int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } private int getMonthPlus() { Calendar cd = Calendar.getInstance(); int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH); cd.set(Calendar.DATE, 1);// 把日期設置為當月第一天 cd.roll(Calendar.DATE, -1);// 日期回滾一天，也就是最後一天 MaxDate = cd.get(Calendar.DATE); if (monthOfNumber == 1) { return -MaxDate; } else { return 1 - monthOfNumber; } } public String getPreviousMonthEnd() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH, -1);// 減一個月 lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天 lastDate.roll(Calendar.DATE, -1);// 日期回滾一天，也就是本月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getNextMonthFirst() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH, 1);// 減一個月 lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天 str = sdf.format(lastDate.getTime()); return str; } public String getNextMonthEnd() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH, 1);// 加一個月 lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天 lastDate.roll(Calendar.DATE, -1);// 日期回滾一天，也就是本月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getNextYearEnd() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.YEAR, 1);// 加一個年 lastDate.set(Calendar.DAY_OF_YEAR, 1); lastDate.roll(Calendar.DAY_OF_YEAR, -1); str = sdf.format(lastDate.getTime()); return str; } public String getNextYearFirst() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.YEAR, 1);// 加一個年 lastDate.set(Calendar.DAY_OF_YEAR, 1); str = sdf.format(lastDate.getTime()); return str; } private int getMaxYear() { Calendar cd = Calendar.getInstance(); cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期設為當年第一天 cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滾一天。 int MaxYear = cd.get(Calendar.DAY_OF_YEAR); return MaxYear; } private int getYearPlus() { Calendar cd = Calendar.getInstance(); int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);// 獲得當天是一年中的第幾天 cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期設為當年第一天 cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滾一天。 int MaxYear = cd.get(Calendar.DAY_OF_YEAR); if (yearOfNumber == 1) { return -MaxYear; } else { return 1 - yearOfNumber; } } public String getCurrentYearFirst() { int yearPlus = this.getYearPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, yearPlus); Date yearDay = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preYearDay = df.format(yearDay); return preYearDay; } // 獲得本年最後一天的日期 * public String getCurrentYearEnd() { Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); return years + "-12-31"; } // 獲得上年第一天的日期 * public String getPreviousYearFirst() { Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); years_value--; return years_value + "-1-1"; } // 獲得上年最後一天的日期 public String getPreviousYearEnd() { weeks--; int yearPlus = this.getYearPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, yearPlus + MaxYear * weeks + (MaxYear - 1)); Date yearDay = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preYearDay = df.format(yearDay); return preYearDay; } public String getThisSeasonFirstTime(int month) { int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } }; int season = 1; if (month >= 1 && month <= 3) { season = 1; } if (month >= 4 && month <= 6) { season = 2; } if (month >= 7 && month <= 9) { season = 3; } if (month >= 10 && month <= 12) { season = 4; } int start_month = array[season - 1][0]; int end_month = array[season - 1][2]; Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); int end_days = getLastDayOfMonth(years_value, end_month); String seasonDate = years_value + "-" + start_month + "-" + start_days; return seasonDate; } public String getThisSeasonFinallyTime(int month) { int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } }; int season = 1; if (month >= 1 && month <= 3) { season = 1; } if (month >= 4 && month <= 6) { season = 2; } if (month >= 7 && month <= 9) { season = 3; } if (month >= 10 && month <= 12) { season = 4; } int start_month = array[season - 1][0]; int end_month = array[season - 1][2]; Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); int end_days = getLastDayOfMonth(years_value, end_month); String seasonDate = years_value + "-" + end_month + "-" + end_days; return seasonDate; } private int getLastDayOfMonth(int year, int month) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { return 31; } if (month == 4 || month == 6 || month == 9 || month == 11) { return 30; } if (month == 2) { if (isLeapYear(year)) { return 29; } else { return 28; } } return 0; } public boolean isLeapYear(int year) { return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0); } public boolean isLeapYear2(int year) { return new GregorianCalendar().isLeapYear(year); } } import java.text.DateFormat; import java.text.ParsePosition; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; /** * Android Calendar的運用 * @author Administrator * */ public class CalendarUtil { private int weeks = 0;// 用來全局控制 上一周，本周，下一周的周數變化 private int MaxDate; // 一月最大天數 private int MaxYear; // 一年最大天數 public static void main(String[] args) { CalendarUtil tt = new CalendarUtil(); System.out.println("獲取當天日期:" + tt.getNowTime("yyyy-MM-dd")); System.out.println("獲取本周一日期:" + tt.getMondayOFWeek()); System.out.println("獲取本周日的日期:" + tt.getCurrentWeekday()); System.out.println("獲取上周一日期:" + tt.getPreviousWeekday()); System.out.println("獲取上周日日期:" + tt.getPreviousWeekSunday()); System.out.println("獲取下周一日期:" + tt.getNextMonday()); System.out.println("獲取下周日日期:" + tt.getNextSunday()); System.out.println("獲得相應周的周六的日期:" + tt.getNowTime("yyyy-MM-dd")); System.out.println("獲取本月第一天日期:" + tt.getFirstDayOfMonth()); System.out.println("獲取本月最後一天日期:" + tt.getDefaultDay()); System.out.println("獲取上月第一天日期:" + tt.getPreviousMonthFirst()); System.out.println("獲取上月最後一天的日期:" + tt.getPreviousMonthEnd()); System.out.println("獲取下月第一天日期:" + tt.getNextMonthFirst()); System.out.println("獲取下月最後一天日期:" + tt.getNextMonthEnd()); System.out.println("獲取本年的第一天日期:" + tt.getCurrentYearFirst()); System.out.println("獲取本年最後一天日期:" + tt.getCurrentYearEnd()); System.out.println("獲取去年的第一天日期:" + tt.getPreviousYearFirst()); System.out.println("獲取去年的最後一天日期:" + tt.getPreviousYearEnd()); System.out.println("獲取明年第一天日期:" + tt.getNextYearFirst()); System.out.println("獲取明年最後一天日期:" + tt.getNextYearEnd()); System.out.println("獲取本季度第一天:" + tt.getThisSeasonFirstTime(11)); System.out.println("獲取本季度最後一天:" + tt.getThisSeasonFinallyTime(11)); System.out.println("獲取兩個日期之間間隔天數2008-12-1~2008-9.29:" + CalendarUtil.getTwoDay("2008-12-1", "2008-9-29")); System.out.println("獲取當前月的第幾周：" + tt.getWeekOfMonth()); System.out.println("獲取當前年份：" + tt.getYear()); System.out.println("獲取當前月份：" + tt.getMonth()); System.out.println("獲取今天在本年的第幾天：" + tt.getDayOfYear()); System.out.println("獲得今天在本月的第幾天(獲得當前日)：" + tt.getDayOfMonth()); System.out.println("獲得今天在本周的第幾天：" + tt.getDayOfWeek()); System.out.println("獲得半年後的日期：" + tt.convertDateToString(tt.getTimeYearNext())); } public static int getYear() { return Calendar.getInstance().get(Calendar.YEAR); } public static int getMonth() { return Calendar.getInstance().get(Calendar.MONTH) + 1; } public static int getDayOfYear() { return Calendar.getInstance().get(Calendar.DAY_OF_YEAR); } public static int getDayOfMonth() { return Calendar.getInstance().get(Calendar.DAY_OF_MONTH); } public static int getDayOfWeek() { return Calendar.getInstance().get(Calendar.DAY_OF_WEEK); } public static int getWeekOfMonth() { return Calendar.getInstance().get(Calendar.DAY_OF_WEEK_IN_MONTH); } public static Date getTimeYearNext() { Calendar.getInstance().add(Calendar.DAY_OF_YEAR, 183); return Calendar.getInstance().getTime(); } public static String convertDateToString(Date dateTime) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); return df.format(dateTime); } public static String getTwoDay(String sj1, String sj2) { SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); long day = 0; try { java.util.Date date = myFormatter.parse(sj1); java.util.Date mydate = myFormatter.parse(sj2); day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); } catch (Exception e) { return ""; } return day + ""; } public static String getWeek(String sdate) { // 再轉換為時間 Date date = CalendarUtil.strToDate(sdate); Calendar c = Calendar.getInstance(); c.setTime(date); // int hour=c.get(Calendar.DAY_OF_WEEK); // hour中存的就是星期幾了，其范圍 1~7 // 1=星期日 7=星期六，其他類推 return new SimpleDateFormat("EEEE").format(c.getTime()); } public static Date strToDate(String strDate) { SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(strDate, pos); return strtodate; } public static long getDays(String date1, String date2) { if (date1 == null || date1.equals("")) return 0; if (date2 == null || date2.equals("")) return 0; // 轉換為標准時間 SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date date = null; java.util.Date mydate = null; try { date = myFormatter.parse(date1); mydate = myFormatter.parse(date2); } catch (Exception e) { } long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000); return day; } public String getDefaultDay() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE, 1);// 設為當前月的1號 lastDate.add(Calendar.MONTH, 1);// 加一個月，變為下月的1號 lastDate.add(Calendar.DATE, -1);// 減去一天，變為當月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getPreviousMonthFirst() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE, 1);// 設為當前月的1號 lastDate.add(Calendar.MONTH, -1);// 減一個月，變為下月的1號 // lastDate.add(Calendar.DATE,-1);//減去一天，變為當月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getFirstDayOfMonth() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE, 1);// 設為當前月的1號 str = sdf.format(lastDate.getTime()); return str; } public String getCurrentWeekday() { weeks = 0; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getNowTime(String dateformat) { Date now = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);// 可以方便地修改日期格式 String hehe = dateFormat.format(now); return hehe; } private int getMondayPlus() { Calendar cd = Calendar.getInstance(); // 獲得今天是一周的第幾天，星期日是第一天，星期二是第二天...... int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因為按中國禮拜一作為第一天所以這裡減1 if (dayOfWeek == 1) { return 0; } else { return 1 - dayOfWeek; } } public String getMondayOFWeek() { weeks = 0; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getSaturday() { int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getPreviousWeekSunday() { weeks = 0; weeks--; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getPreviousWeekday() { weeks--; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getNextMonday() { weeks++; int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } public String getNextSunday() { int mondayPlus = this.getMondayPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 + 6); Date monday = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preMonday = df.format(monday); return preMonday; } private int getMonthPlus() { Calendar cd = Calendar.getInstance(); int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH); cd.set(Calendar.DATE, 1);// 把日期設置為當月第一天 cd.roll(Calendar.DATE, -1);// 日期回滾一天，也就是最後一天 MaxDate = cd.get(Calendar.DATE); if (monthOfNumber == 1) { return -MaxDate; } else { return 1 - monthOfNumber; } } public String getPreviousMonthEnd() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH, -1);// 減一個月 lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天 lastDate.roll(Calendar.DATE, -1);// 日期回滾一天，也就是本月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getNextMonthFirst() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH, 1);// 減一個月 lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天 str = sdf.format(lastDate.getTime()); return str; } public String getNextMonthEnd() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.MONTH, 1);// 加一個月 lastDate.set(Calendar.DATE, 1);// 把日期設置為當月第一天 lastDate.roll(Calendar.DATE, -1);// 日期回滾一天，也就是本月最後一天 str = sdf.format(lastDate.getTime()); return str; } public String getNextYearEnd() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.YEAR, 1);// 加一個年 lastDate.set(Calendar.DAY_OF_YEAR, 1); lastDate.roll(Calendar.DAY_OF_YEAR, -1); str = sdf.format(lastDate.getTime()); return str; } public String getNextYearFirst() { String str = ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); Calendar lastDate = Calendar.getInstance(); lastDate.add(Calendar.YEAR, 1);// 加一個年 lastDate.set(Calendar.DAY_OF_YEAR, 1); str = sdf.format(lastDate.getTime()); return str; } private int getMaxYear() { Calendar cd = Calendar.getInstance(); cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期設為當年第一天 cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滾一天。 int MaxYear = cd.get(Calendar.DAY_OF_YEAR); return MaxYear; } private int getYearPlus() { Calendar cd = Calendar.getInstance(); int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);// 獲得當天是一年中的第幾天 cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期設為當年第一天 cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滾一天。 int MaxYear = cd.get(Calendar.DAY_OF_YEAR); if (yearOfNumber == 1) { return -MaxYear; } else { return 1 - yearOfNumber; } } public String getCurrentYearFirst() { int yearPlus = this.getYearPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, yearPlus); Date yearDay = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preYearDay = df.format(yearDay); return preYearDay; } // 獲得本年最後一天的日期 * public String getCurrentYearEnd() { Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); return years + "-12-31"; } // 獲得上年第一天的日期 * public String getPreviousYearFirst() { Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); years_value--; return years_value + "-1-1"; } // 獲得上年最後一天的日期 public String getPreviousYearEnd() { weeks--; int yearPlus = this.getYearPlus(); GregorianCalendar currentDate = new GregorianCalendar(); currentDate.add(GregorianCalendar.DATE, yearPlus + MaxYear * weeks + (MaxYear - 1)); Date yearDay = currentDate.getTime(); DateFormat df = DateFormat.getDateInstance(); String preYearDay = df.format(yearDay); return preYearDay; } public String getThisSeasonFirstTime(int month) { int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } }; int season = 1; if (month >= 1 && month <= 3) { season = 1; } if (month >= 4 && month <= 6) { season = 2; } if (month >= 7 && month <= 9) { season = 3; } if (month >= 10 && month <= 12) { season = 4; } int start_month = array[season - 1][0]; int end_month = array[season - 1][2]; Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); int end_days = getLastDayOfMonth(years_value, end_month); String seasonDate = years_value + "-" + start_month + "-" + start_days; return seasonDate; } public String getThisSeasonFinallyTime(int month) { int array[][] = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, { 10, 11, 12 } }; int season = 1; if (month >= 1 && month <= 3) { season = 1; } if (month >= 4 && month <= 6) { season = 2; } if (month >= 7 && month <= 9) { season = 3; } if (month >= 10 && month <= 12) { season = 4; } int start_month = array[season - 1][0]; int end_month = array[season - 1][2]; Date date = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");// 可以方便地修改日期格式 String years = dateFormat.format(date); int years_value = Integer.parseInt(years); int start_days = 1;// years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month); int end_days = getLastDayOfMonth(years_value, end_month); String seasonDate = years_value + "-" + end_month + "-" + end_days; return seasonDate; } private int getLastDayOfMonth(int year, int month) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { return 31; } if (month == 4 || month == 6 || month == 9 || month == 11) { return 30; } if (month == 2) { if (isLeapYear(year)) { return 29; } else { return 28; } } return 0; } public boolean isLeapYear(int year) { return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0); } public boolean isLeapYear2(int year) { return new GregorianCalendar().isLeapYear(year); } }

關於Android程序生命周期：
程序正常啟動：onCreate()->onStart()->onResume();
正常退出：onPause()->onStop()->onDestory()

一個Activity啟動另一個Activity: onPause()->onStop(), 再返回：onRestart()->onStart()->onResume()

程序按back 退出： onPause()->onStop()->onDestory(),再進入：onCreate()->onStart()->onResume();
程序按home 退出： onPause()->onStop(),再進入：onRestart()->onStart()->onResume();


重寫Aactivity的onResume()方法，在onResume()方面裡進行刷新操作。因為按照activity的生命周期模型，當activity恢復的時候，onResume()方法會被調用。進入onresume（） 程序就可以與用戶進行交互，詳情可以查看log！

2014.1.22