android得到時間工具類

Android的文件有建議用Time代替Calendar。用Time對CPU的負荷會較小。在寫Widget時特別重要。

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

 

[java]  view plain copy

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.          
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("當前時間爲：" + year +       
25.                             "年 " + month +       
26.                             "月 " + day +       
27.                             "日 " + hour +       
28.                             "時 " + minute +       
29.                             "分 " + sec +       
30.                             "秒");      
31.     }      
32. }     

惟一不足是取出時間只有24小時模式.

 

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

 

 如何獲取Android系統時間是24小時制仍是12小時制 
        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();
取得系統日期:year = c.get(Calendar.YEAR)
               month = c.grt(Calendar.MONTH)
               day = c.get(Calendar.DAY_OF_MONTH)
取得系統時間：hour = c.get(Calendar.HOUR_OF_DAY);
                  minute = c.get(Calendar.MINUTE)

利用Calendar獲取
 Calendar c = Calendar.getInstance();
取得系統日期:year = c.get(Calendar.YEAR)
               month = c.grt(Calendar.MONTH)
               day = c.get(Calendar.DAY_OF_MONTH)
取得系統時間：hour = c.get(Calendar.HOUR_OF_DAY);
                  minute = c.get(Calendar.MINUTE) 
                    Calendar c = Calendar.getInstance();
取得系統日期:year = c.get(Calendar.YEAR)
                   month = c.grt(Calendar.MONTH)
                   day = c.get(Calendar.DAY_OF_MONTH)
取得系統時間：hour = c.get(Calendar.HOUR_OF_DAY);
                     minute = c.get(Calendar.MINUTE)