Android的文件有建议用Time代替Calendar。用Time对CPU的负荷会较小。在写Widget时特别重要。

Time t=new Time(); // or Time t=new Time("GMT+8"); 加上Time Zone资料。

 

[java] view plaincopy
  1. package itokit.com;      
  2.      
  3. import android.app.Activity;      
  4. import android.os.Bundle;      
  5. import android.text.format.Time;      
  6. import android.widget.TextView;      
  7.      
  8. public class ShowTime extends Activity {      
  9.     /** Called when the activity is first created. */     
  10.     @Override     
  11.     public void onCreate(Bundle savedInstanceState) {      
  12.         super.onCreate(savedInstanceState);      
  13.         setContentView(R.layout.main);      
  14.               
  15.         TextView myTextView = (TextView)findViewById(R.id.myTextView);      
  16.         Time time = new Time("GMT+8");       
  17.         time.setToNow();      
  18.         int year = time.year;      
  19.         int month = time.month;      
  20.         int day = time.monthDay;      
  21.         int minute = time.minute;      
  22.         int hour = time.hour;      
  23.         int sec = time.second;      
  24.         myTextView.setText("当前时间为：" + year +       
  25.                             "年 " + month +       
  26.                             "月 " + day +       
  27.                             "日 " + hour +       
  28.                             "时 " + minute +       
  29.                             "分 " + sec +       
  30.                             "秒");      
  31.     }      
  32. }     


唯一不足是取出时间只有24小时模式.

 

long time=System.currentTimeMillis();
 final Calendar mCalendar=Calendar.getInstance();
 mCalendar.setTimeInMillis(time);
 取得小时：mHour=mCalendar.get(Calendar.HOUR);
 取得分钟：mMinuts=mCalendar.get(Calendar.MINUTE);

 

 如何获取Android系统时间是24小时制还是12小时制 
        ContentResolver cv = this.getContentResolver();
        String strTimeFormat = android.provider.Settings.System.getString(cv,
                                           android.provider.Settings.System.TIME_12_24);
       
        if(strTimeFormat.equals("24"))

       {
               Log.i("activity","24");
        }

Calendar c = Calendar.getInstance();
取得系统日期:year = c.get(Calendar.YEAR)
               month = c.grt(Calendar.MONTH)
               day = c.get(Calendar.DAY_OF_MONTH)
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);
                  minute = c.get(Calendar.MINUTE)


利用Calendar获取
 Calendar c = Calendar.getInstance();
取得系统日期:year = c.get(Calendar.YEAR)
               month = c.grt(Calendar.MONTH)
               day = c.get(Calendar.DAY_OF_MONTH)
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);
                  minute = c.get(Calendar.MINUTE)
                    Calendar c = Calendar.getInstance();
取得系统日期:year = c.get(Calendar.YEAR)
                   month = c.grt(Calendar.MONTH)
                   day = c.get(Calendar.DAY_OF_MONTH)
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);
                     minute = c.get(Calendar.MINUTE)