如何使用Android Studio获取当前日期的Google Calendar免费插槽列表？

   private static final int REQUEST_AUTHORIZATION = 1001;

   private static final String[] SCOPES = {CalendarScopes.CALENDAR_READONLY};

   private GoogleAccountCredential mCredential;

   @Override

   protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

       // 初始化Google Calendar API凭证

       mCredential = GoogleAccountCredential.usingOAuth2(

               getApplicationContext(), Arrays.asList(SCOPES))

               .setBackOff(new ExponentialBackOff());

       // 获取当前日期

       Calendar calendar = Calendar.getInstance();

       int year = calendar.get(Calendar.YEAR);

       int month = calendar.get(Calendar.MONTH);

       int day = calendar.get(Calendar.DAY_OF_MONTH);

       // 调用获取插槽列表的方法

       getFreeSlots(year, month, day);

   }

   private void getFreeSlots(int year, int month, int day) {

       new AsyncTask<Void, Void, List<TimePeriod>>() {

           @Override

           protected List<TimePeriod> doInBackground(Void... voids) {

               try {

                   // 初始化HTTP传输和JSON工厂

                   HttpTransport transport = new NetHttpTransport();

                   JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();

                   // 获取Google Calendar服务

                   Calendar service = new Calendar.Builder(

                           transport, jsonFactory, mCredential)

                           .setApplicationName("Your Application Name")

                           .build();

                   // 创建时间范围对象

                   TimePeriod timePeriod = new TimePeriod()

                           .setStart(new DateTime(year, month + 1, day, 0, 0))

                           .setEnd(new DateTime(year, month + 1, day, 23, 59));

                   // 创建查询参数对象

                   FreeBusyRequest.RequestItems requestItems = new FreeBusyRequest.RequestItems();

                   requestItems.setTimeMin(timePeriod.getStart());

                   requestItems.setTimeMax(timePeriod.getEnd());

                   // 创建查询对象

                   FreeBusyRequest request = new FreeBusyRequest();

                   request.setItems(Arrays.asList(requestItems));

                   // 发送查询请求

                   FreeBusyResponse response = service.freebusy().query(request).execute();

                   // 获取免费插槽列表

                   List<TimePeriod> freeSlots = new ArrayList<>();

                   if (response.getCalendars() != null) {

                       CalendarCalendar calendar = response.getCalendars().get("primary");

                       if (calendar.getBusy() != null) {

                           for (TimePeriod busyPeriod : calendar.getBusy()) {

                               freeSlots.add(busyPeriod);

                           }

                       }

                   }

                   return freeSlots;

               } catch (UserRecoverableAuthIOException e) {

                   // 处理用户授权异常

                   startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);

                   return null;

               } catch (IOException e) {

                   e.printStackTrace();

                   return null;

               }

           }

           @Override

           protected void onPostExecute(List<TimePeriod> freeSlots) {

               super.onPostExecute(freeSlots);

               if (freeSlots != null) {

                   // 在这里处理免费插槽列表数据

               }

           }

       }.execute();

   }