public void checkEventsInCal() {
    ContentResolver cr = getContentResolver();
    Cursor cursor = cr.query(Uri.parse("content://com.android.calendar/events"), new String[]{"_id"}, "_id=?", new String[]{CalendarContract.Events.TITLE}, null);

    if (cursor.moveToFirst()) {
        Toast.makeText(this,"Event Exists!", Toast.LENGTH_SHORT).show();
    }else {
        Toast.makeText(this,"Event Doesn't Exist!", Toast.LENGTH_SHORT).show();
    }
}