Calendar event saved locally on phone, but can't sync to Google Calendar

I try to add a calendar by the following code. The event created can be read by calendar apps on my phone, but just sync to online Google Calendar. Can any one give me some hits to solve the issue?

here are some remark 1. Code was run on my real phone (Galaxy Nexus 4.1.1) 2. All other calendar events can sync to Google Calendar, just the program-added cannot be sync.

---update---

When I change the follow code

values.put(CalendarContract.Events.SYNC_EVENTS,1);
values.put(CalendarContract.Events.VISIBLE, 1);

-- I get the error

java.lang.IllegalArgumentException: Only the provider may write to sync_events

    public void addEvent() {

    long startMillis = 0;
    long endMillis = 0;

    Log.v("LOG", "entered addEvent");


    //Calendar beginTime = Calendar.getInstance();
    //beginTime.set(2012, 8, 11, 22, 0);
    //startMillis = beginTime.getTimeInMillis();
    startMillis = System.currentTimeMillis() + (3600 * 1000)*4;

    //Calendar endTime = Calendar.getInstance();
    //endTime.set(2012, 8, 11, 23, 0);
    //endMillis = endTime.getTimeInMillis();
    endMillis = System.currentTimeMillis() + (3600 * 1000)*5;

    ContentResolver cr = getContentResolver();
    ContentValues values = new ContentValues();

    values.put(CalendarContract.Events.DTSTART, startMillis);
    values.put(CalendarContract.Events.DTEND, endMillis);
    values.put(CalendarContract.Events.TITLE, "Dog");
    values.put(CalendarContract.Events.DESCRIPTION, "DogInDESCRIPTION");
    values.put(CalendarContract.Events.CALENDAR_ID, 1);
    values.put(CalendarContract.Events.EVENT_TIMEZONE, "eventTimezone");

    values.put(CalendarContract.Events.SYNC_EVENTS,0);      


    cr.insert(CalendarContract.Events.CONTENT_URI, values);
}