日曆事件可保存到電話，但不能同步到網上日曆

我以以下程序碼添加一個Calendar event。

我的手機的日曆可以讀取這Calendar event，但不能同步到網上日曆。誰能給解決問題嗎？

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1.     public void addEvent() {
   
2. 
   
3.     long startMillis = 0;
   
4.     long endMillis = 0;
   
5. 
   
6.     Log.v("LOG", "entered addEvent");
   
7. 
   
8. 
   
9.     //Calendar beginTime = Calendar.getInstance();
   
10.     //beginTime.set(2012, 8, 11, 22, 0);
    
11.     //startMillis = beginTime.getTimeInMillis();
    
12.     startMillis = System.currentTimeMillis() + (3600 * 1000)*4;
    
13. 
    
14.     //Calendar endTime = Calendar.getInstance();
    
15.     //endTime.set(2012, 8, 11, 23, 0);
    
16.     //endMillis = endTime.getTimeInMillis();
    
17.     endMillis = System.currentTimeMillis() + (3600 * 1000)*5;
    
18. 
    
19.     ContentResolver cr = getContentResolver();
    
20.     ContentValues values = new ContentValues();
    
21. 
    
22.     values.put(CalendarContract.Events.DTSTART, startMillis);
    
23.     values.put(CalendarContract.Events.DTEND, endMillis);
    
24.     values.put(CalendarContract.Events.TITLE, "Dog");
    
25.     values.put(CalendarContract.Events.DESCRIPTION, "DogInDESCRIPTION");
    
26.     values.put(CalendarContract.Events.CALENDAR_ID, 1);
    
27.     values.put(CalendarContract.Events.EVENT_TIMEZONE, "eventTimezone");
    
28. 
    
29.          
    
30. 
    
31. 
    
32.     cr.insert(CalendarContract.Events.CONTENT_URI, values);
    
33. }
    

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