Android技术精髓-Timing Activity

浏览数：17 / 时间：2015年06月11日

Android技术精髓-Timing Activity

Timing Activity

顾名思义，在activity中实时通过线程通信显示当前时间，也是主要用到线程通信的知识,

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);
	}
}

运行结果，实时显示目前时间。

当然的，你也可以实时显示任何变化的东西，时间、倒计时、等等。

关于多线程之Handler 可以看下之前这篇博客：http://blog.csdn.net/zhangtengyuan23/article/details/8862039

Calendar

Calendar是一个Datedar对象和一组整型字段如年，月，日，小时，等之间转换的抽象基类。

使用calendar可以方便的获取系统控制的任何时间相关信息。

Calendar运用大全：

public class CalendarUtil { 
 
    private int weeks = 0;// 用来全局控制 上一周，本周，下一周的周数变化  
    private int MaxDate; // 一月最大天数  
    private int MaxYear; // 一年最大天数  
     
    public static void main(String[] args) { 
        CalendarUtil tt = new CalendarUtil(); 
        System.out.println("获取当天日期:" + tt.getNowTime("yyyy-MM-dd")); 
        System.out.println("获取本周一日期:" + tt.getMondayOFWeek()); 
        System.out.println("获取本周日的日期:" + tt.getCurrentWeekday()); 
        System.out.println("获取上周一日期:" + tt.getPreviousWeekday()); 
        System.out.println("获取上周日日期:" + tt.getPreviousWeekSunday()); 
        System.out.println("获取下周一日期:" + tt.getNextMonday()); 
        System.out.println("获取下周日日期:" + tt.getNextSunday()); 
        System.out.println("获得相应周的周六的日期:" + tt.getNowTime("yyyy-MM-dd")); 
        System.out.println("获取本月第一天日期:" + tt.getFirstDayOfMonth()); 
        System.out.println("获取本月最后一天日期:" + tt.getDefaultDay()); 
        System.out.println("获取上月第一天日期:" + tt.getPreviousMonthFirst()); 
        System.out.println("获取上月最后一天的日期:" + tt.getPreviousMonthEnd()); 
        System.out.println("获取下月第一天日期:" + tt.getNextMonthFirst()); 
        System.out.println("获取下月最后一天日期:" + tt.getNextMonthEnd()); 
        System.out.println("获取本年的第一天日期:" + tt.getCurrentYearFirst()); 
        System.out.println("获取本年最后一天日期:" + tt.getCurrentYearEnd()); 
        System.out.println("获取去年的第一天日期:" + tt.getPreviousYearFirst()); 
        System.out.println("获取去年的最后一天日期:" + tt.getPreviousYearEnd()); 
        System.out.println("获取明年第一天日期:" + tt.getNextYearFirst()); 
        System.out.println("获取明年最后一天日期:" + tt.getNextYearEnd()); 
        System.out.println("获取本季度第一天:" + tt.getThisSeasonFirstTime(11)); 
        System.out.println("获取本季度最后一天:" + tt.getThisSeasonFinallyTime(11)); 
        System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:" 
                + CalendarUtil.getTwoDay("2008-12-1", "2008-9-29")); 
        System.out.println("获取当前月的第几周：" + tt.getWeekOfMonth()); 
        System.out.println("获取当前年份：" + tt.getYear()); 
        System.out.println("获取当前月份：" + tt.getMonth()); 
        System.out.println("获取今天在本年的第几天：" + tt.getDayOfYear()); 
        System.out.println("获得今天在本月的第几天(获得当前日)：" + tt.getDayOfMonth()); 
        System.out.println("获得今天在本周的第几天：" + tt.getDayOfWeek()); 
        System.out.println("获得半年后的日期：" 
                + 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) { 
        // 再转换为时间  
        Date date = CalendarUtil.strToDate(sdate); 
        Calendar c = Calendar.getInstance(); 
        c.setTime(date); 
        // int hour=c.get(Calendar.DAY_OF_WEEK);  
        // hour中存的就是星期几了，其范围 1~7  
        // 1=星期日 7=星期六，其他类推  
        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; 
        // 转换为标准时间  
        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);// 设为当前月的1号  
        lastDate.add(Calendar.MONTH, 1);// 加一个月，变为下月的1号  
        lastDate.add(Calendar.DATE, -1);// 减去一天，变为当月最后一天  
 
        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);// 设为当前月的1号  
        lastDate.add(Calendar.MONTH, -1);// 减一个月，变为下月的1号  
        // lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天  
 
        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);// 设为当前月的1号  
        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(); 
        // 获得今天是一周的第几天，星期日是第一天，星期二是第二天......  
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减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);// 把日期设置为当月第一天  
        cd.roll(Calendar.DATE, -1);// 日期回滚一天，也就是最后一天  
        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);// 减一个月  
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天  
        lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天  
        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);// 减一个月  
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天  
        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);// 加一个月  
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天  
        lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天  
        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);// 加一个年  
        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);// 加一个年  
        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);// 把日期设为当年第一天  
        cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。  
        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);// 获得当天是一年中的第几天  
        cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天  
        cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。  
        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; 
    } 
 
    // 获得本年最后一天的日期 *  
    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"; 
    } 
 
    // 获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"; 
    } 
 
    // 获得上年最后一天的日期  
    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的运用
 * @author Administrator
 *
 */
public class CalendarUtil {

    private int weeks = 0;// 用来全局控制 上一周，本周，下一周的周数变化
    private int MaxDate; // 一月最大天数
    private int MaxYear; // 一年最大天数
   
    public static void main(String[] args) {
        CalendarUtil tt = new CalendarUtil();
        System.out.println("获取当天日期:" + tt.getNowTime("yyyy-MM-dd"));
        System.out.println("获取本周一日期:" + tt.getMondayOFWeek());
        System.out.println("获取本周日的日期:" + tt.getCurrentWeekday());
        System.out.println("获取上周一日期:" + tt.getPreviousWeekday());
        System.out.println("获取上周日日期:" + tt.getPreviousWeekSunday());
        System.out.println("获取下周一日期:" + tt.getNextMonday());
        System.out.println("获取下周日日期:" + tt.getNextSunday());
        System.out.println("获得相应周的周六的日期:" + tt.getNowTime("yyyy-MM-dd"));
        System.out.println("获取本月第一天日期:" + tt.getFirstDayOfMonth());
        System.out.println("获取本月最后一天日期:" + tt.getDefaultDay());
        System.out.println("获取上月第一天日期:" + tt.getPreviousMonthFirst());
        System.out.println("获取上月最后一天的日期:" + tt.getPreviousMonthEnd());
        System.out.println("获取下月第一天日期:" + tt.getNextMonthFirst());
        System.out.println("获取下月最后一天日期:" + tt.getNextMonthEnd());
        System.out.println("获取本年的第一天日期:" + tt.getCurrentYearFirst());
        System.out.println("获取本年最后一天日期:" + tt.getCurrentYearEnd());
        System.out.println("获取去年的第一天日期:" + tt.getPreviousYearFirst());
        System.out.println("获取去年的最后一天日期:" + tt.getPreviousYearEnd());
        System.out.println("获取明年第一天日期:" + tt.getNextYearFirst());
        System.out.println("获取明年最后一天日期:" + tt.getNextYearEnd());
        System.out.println("获取本季度第一天:" + tt.getThisSeasonFirstTime(11));
        System.out.println("获取本季度最后一天:" + tt.getThisSeasonFinallyTime(11));
        System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"
                + CalendarUtil.getTwoDay("2008-12-1", "2008-9-29"));
        System.out.println("获取当前月的第几周：" + tt.getWeekOfMonth());
        System.out.println("获取当前年份：" + tt.getYear());
        System.out.println("获取当前月份：" + tt.getMonth());
        System.out.println("获取今天在本年的第几天：" + tt.getDayOfYear());
        System.out.println("获得今天在本月的第几天(获得当前日)：" + tt.getDayOfMonth());
        System.out.println("获得今天在本周的第几天：" + tt.getDayOfWeek());
        System.out.println("获得半年后的日期："
                + 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) {
        // 再转换为时间
        Date date = CalendarUtil.strToDate(sdate);
        Calendar c = Calendar.getInstance();
        c.setTime(date);
        // int hour=c.get(Calendar.DAY_OF_WEEK);
        // hour中存的就是星期几了，其范围 1~7
        // 1=星期日 7=星期六，其他类推
        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;
        // 转换为标准时间
        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);// 设为当前月的1号
        lastDate.add(Calendar.MONTH, 1);// 加一个月，变为下月的1号
        lastDate.add(Calendar.DATE, -1);// 减去一天，变为当月最后一天

        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);// 设为当前月的1号
        lastDate.add(Calendar.MONTH, -1);// 减一个月，变为下月的1号
        // lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天

        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);// 设为当前月的1号
        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();
        // 获得今天是一周的第几天，星期日是第一天，星期二是第二天......
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK) - 1; // 因为按中国礼拜一作为第一天所以这里减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);// 把日期设置为当月第一天
        cd.roll(Calendar.DATE, -1);// 日期回滚一天，也就是最后一天
        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);// 减一个月
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
        lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
        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);// 减一个月
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
        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);// 加一个月
        lastDate.set(Calendar.DATE, 1);// 把日期设置为当月第一天
        lastDate.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
        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);// 加一个年
        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);// 加一个年
        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);// 把日期设为当年第一天
        cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。
        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);// 获得当天是一年中的第几天
        cd.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天
        cd.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。
        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;
    }

    // 获得本年最后一天的日期 *
    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";
    }

    // 获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";
    }

    // 获得上年最后一天的日期
    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);
    }
}

关于Android程序生命周期：

程序正常启动：onCreate()->onStart()->onResume();
正常退出：onPause()->onStop()->onDestory()

一个Activity启动另一个Activity: onPause()->onStop(), 再返回：onRestart()->onStart()->onResume()

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

重写Aactivity的onResume()方法，在onResume()方面里进行刷新操作。因为按照activity的生命周期模型，当activity恢复的时候，onResume()方法会被调用。进入onresume（）程序就可以与用户进行交互，详情可以查看log！

2014.1.22

郑重声明：本站内容如果来自互联网及其他传播媒体，其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享，并不代表本站赞同其观点和对其真实性负责，也不构成任何其他建议。

Android技术精髓-Timing Activity