com.google.api.services.calendar.Calendar无法获取事件，但“主要”事件

Question

在MainActivity类中，我有一个AsyncTask内部类，用于从日历中检索事件：

private class MakeRequestTask extends AsyncTask<Void, Void, List<>> {

    private com.google.api.services.calendar.Calendar mService;
    private Exception mLastError = null;

    MakeRequestTask(GoogleAccountCredential credential) {

        HttpTransport transport = AndroidHttp.newCompatibleTransport();
        JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();

        mService = new com.google.api.services.calendar.Calendar.Builder(
                transport, jsonFactory, credential)
                .setApplicationName(getString(R.string.app_name))
                .build();
    }

    @Override
    protected List<> doInBackground(Void... params) {

        try {
            return getDataFromApi();
        } catch (Exception e) {

            mLastError = e;
            cancel(true);
            return null;
        }
    }

    private List<> getDataFromApi() throws IOException {

        DateTime now = new DateTime(System.currentTimeMillis());

        List<> eventDates = new ArrayList<>();

                Events events = mService.events().list("primary")
                .setMaxResults(30)
                .setTimeMin(now)
                .setOrderBy("startTime")
                .setSingleEvents(true)
                .execute();

        List<Event> items = events.getItems();

        String sameDateTime = null;
        boolean showDate;

        for (Event event : items) {

            DateTime start = event.getStart().getDateTime();

            eventDates.add(new AppointmentItem(event.getId(),
                    start,
                    event.getSummary(),
                    event.getLocation())
            );
        }

        return eventDates;
    }
}

如果在列表方法中我将“主”作为日历ID Events events = mService.events().list("primary")传递，则效果很好。

这是默认设置，但我想从与特定帐户相关联的每个日历中检索事件。

因此我四处寻找，发现CalendarList calendarList = mService.calendarList().list().execute();可以从日历中获取所有数据（包括日历的ID），但是如果将ID放在上一个语句中，则不会得到任何事件。

我该如何解决？