Android动态显示当前年月日时分秒系统时间(示例代码)

<?xml version="1.0" encoding="utf-8"?> 
 <linearlayout 
 xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:background="@android:color/white"> 
 <textview 
  android:id="@+id/mytime" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:gravity="center" 
  android:textcolor="@android:color/black" 
  android:textsize="36sp"/> 
 </linearlayout> 

import android.app.activity;  
import android.os.bundle;  
import android.os.handler;  
import android.os.message;  
import android.text.format.dateformat;  
import android.widget.textview;  
public class testactivity extends activity {  
  private static final int msgkey1 = 1;  
  private textview mtime;  
  @override  
  public void oncreate(bundle savedinstancestate) {  
    super.oncreate(savedinstancestate);  
    setcontentview(r.layout.time);  
    mtime = (textview) findviewbyid(r.id.mytime);  
    new timethread().start();  
  }  
  public class timethread extends thread {  
    @override  
    public void run () {  
      do {  
        try {  
          thread.sleep(1000);  
          message msg = new message();  
          msg.what = msgkey1;  
          mhandler.sendmessage(msg);  
        }  
        catch (interruptedexception e) {  
          e.printstacktrace();  
        }  
      } while(true);  
    }  
  }  
  private handler mhandler = new handler() {  
    @override  
    public void handlemessage (message msg) {  
      super.handlemessage(msg);  
      switch (msg.what) {  
        case msgkey1:  
          mtime.settext(gettime());  
          break;  
        default:  
          break;  
      }  
    }  
  };  
  //获得当前年月日时分秒星期  
  public string gettime(){  
    final calendar c = calendar.getinstance();  
    c.settimezone(timezone.gettimezone("gmt+8:00"));  
    string myear = string.valueof(c.get(calendar.year)); // 获取当前年份  
    string mmonth = string.valueof(c.get(calendar.month) + 1);// 获取当前月份  
    string mday = string.valueof(c.get(calendar.day_of_month));// 获取当前月份的日期号码  
    string mway = string.valueof(c.get(calendar.day_of_week));  
    string mhour = string.valueof(c.get(calendar.hour_of_day));//时  
    string mminute = string.valueof(c.get(calendar.minute));//分  
    string msecond = string.valueof(c.get(calendar.second));//秒  
    if("1".equals(mway)){  
      mway ="天";  
    }else if("2".equals(mway)){  
      mway ="一";  
    }else if("3".equals(mway)){  
      mway ="二";  
    }else if("4".equals(mway)){  
      mway ="三";  
    }else if("5".equals(mway)){  
      mway ="四";  
    }else if("6".equals(mway)){  
      mway ="五";  
    }else if("7".equals(mway)){  
      mway ="六";  
    }  
    return myear + "年" + mmonth + "月" + mday+"日"+" "+"星期"+mway+" "+mhour+":"+mminute+":"+msecond;  
  }  
}