android 如何获取当前时间

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Android 下如何获取当前确切时间呢？
我们建议Android的开发中用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");
括弧内加上Time Zone资料。

01package itokit.com;  
02   
03import android.app.Activity;  
04import android.os.Bundle;  
05import android.text.format.Time;  
06import android.widget.TextView;  
07   
08public class ShowTime extends Activity {  
09    /** 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}

不足的是只有24小时模式。

下面是其他获取时间的途径：

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)

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