如何在不打开意图的情况下将事件添加到日历？Android

我将按照以下步骤将事件添加到日历中。如果我使用意图通过示例代码插入事件，那么它是有效的。但是，如果我试图通过示例代码直接添加事件，则日历不会发生任何变化。我的代码或设置有什么问题？有人能帮我解决吗

ps我的日历id是1

     public void addEvent(){
    try {
        TimeZone tz= TimeZone.getDefault();
        long caliD = 1;
        long startMillis = 0;
        long endMillis = 0;
        Calendar beginTime = Calendar.getInstance();
        beginTime.set(2020, 11, 14, 7, 30);
        startMillis = beginTime.getTimeInMillis();
        Calendar endTime = Calendar.getInstance();
        endTime.set(2020, 11, 14, 8, 45);
        endMillis = endTime.getTimeInMillis();


        ContentResolver cr = getContentResolver();
        ContentValues values = new ContentValues();
        values.put(CalendarContract.Events.DTSTART, startMillis);
        values.put(CalendarContract.Events.DTEND, endMillis);
        values.put(CalendarContract.Events.TITLE, "Jazzercise");
        values.put(CalendarContract.Events.DESCRIPTION, "Group workout");
        values.put(CalendarContract.Events.CALENDAR_ID, caliD);
        values.put(CalendarContract.Events.EVENT_TIMEZONE, tz.getID());
        Uri uri = cr.insert(CalendarContract.Events.CONTENT_URI, values);
        Toast.makeText(this, "Event added Successfully",
                Toast.LENGTH_LONG).show();
// get the event ID that is the last element in the Uri
        long eventID = Long.parseLong(uri.getLastPathSegment());
//
// ... do something with event ID
//
//
    }catch (Exception e){
        e.printStackTrace();
        Toast.makeText(this, "Exception: " + e.getMessage(),
                Toast.LENGTH_SHORT).show();
    }

    }

舱单：

<uses-permission android:name="android.permission.READ_CALENDAR" />
    <uses-permission android:name="android.permission.WRITE_CALENDAR" />