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我想在添加新事件之前检查日历中是否存在事件:这是我添加事件的代码:

Calendar cal = Calendar.getInstance();              
            Intent intent = new Intent(Intent.ACTION_EDIT);
            intent.setType("vnd.android.cursor.item/event");
            intent.putExtra("beginTime", date.getTime());
            intent.putExtra("allDay", true);
            intent.putExtra("rrule", "FREQ=YEARLY;COUNT=1");
            intent.putExtra("endTime", date.getTime()+60*60);
            intent.putExtra("title", "Blub");
            intent.putExtra("description", "Bla Blu Bli");
            startActivityForResult(intent, 1);

现在请指导我如何检查日历中已经存在的事件?

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