android中获取时间

android中获取时间

1)通过calendar类获取

Calendar calendar = Calendar.getInstance();
int moth = calendar.get(Calendar.MONTH);
int date = calendar.get(Calendar.DATE);
int week = calendar.get(Calendar.DAY_OF_WEEK) - 1;

2)未知方法

获取当前时间：System.currentTimeMillis()    获得的是从1970年1月1日到当前时间的总秒数

获取时区：TimeZone.getDefault();

举例说明：

例1：

Calendar now = Calendar.getInstance();
    TimeZone timeZone = now.getTimeZone();
    
long totalMilliseconds = System.currentTimeMillis() + timeZone.getRawOffset();
    long totalSeconds = totalMilliseconds / 1000;
    int currentSecond = (int)(totalSeconds % 60);
    long totalMinutes = totalSeconds / 60;
    int currentMinute = (int)(totalMinutes % 60);
    long totalHours = totalMinutes / 60;
    int currentHour = (int)(totalHours % 24);
    int totalDays = (int)(totalHours / 24);

int goDays = 0;
    int surplusDays = 0;
    int goYears = 0;
    int leapyear = 0;
    for(int i = 1970;goDays<totalDays;i++)
    {
     if(i%400==0||(i%4==0&&i%100!=0))
      {goDays = goDays+366; leapyear = 1;}
     else {goDays = goDays +365; leapyear = 0;}
     goYears++;
    }

String output = "Current time is " + currentHour + ":"
      + currentMinute + ":" + currentSecond + " GMT"+(1970+goYears-1);
    JOptionPane.showMessageDialog(null, output);

例2：

long l = System.currentTimeMillis();
  Date date = new Date(l);
  Calendar cal = Calendar.getInstance();
  cal.setTime(date);
  System.out.println(cal.get(Calendar.YEAR));
  System.out.println(cal.get(Calendar.MONTH) + 1);// 月份计算是从0作为1开始的。
  System.out.println(cal.get(Calendar.DATE));
  System.out.println(cal.get(Calendar.HOUR));
  System.out.println(cal.get(Calendar.MINUTE));
  System.out.println(cal.get(Calendar.SECOND));

3)通过java包获得时间

public void getTime(){
            time = (TextView) findViewById(R.id.test_1);
        java.util.Date date = new java.util.Date();
        time.setText(date.toString());
    }

加背景颜色的可以改成toLocalString（）或者toGMTString（）

三者的区别(格式)是：(1),toSting()：Tue Sep 20 07:56:00 GMT+00:00 2011

(2),toLocaleString()：Sep 20,2011 08:00:00 AM  (这种格式比较适合大众)

(3),toGMTString()：20 Sep 2011 08:00:00 GMT

4),最简单的，通过android自带的空间完成时钟的添加

分别是AnalogClock机械时钟和DigitalClock数字时钟，只需要在android的xml布局文件中添加两个空间即可

摘自：http://hi.baidu.com/diyangxia/item/43e4390a12946bcfdde5b0a2