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PONullPointerException while accessing the user's calendars list using Google Calendar API
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  1. PONullPointerException while accessing the user's calendars list using Google Calendar API
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    copied!<p>I want to use the Google Calendar Api to pull the calendars, events, etc. I have the authentication token from the AccountManager class in android. So this way if a user is logged in the mobile using his google account, then i can easily retrieve the authentication token related to him. After thati do the following:</p> <pre><code> public Calendar useCalendarAPI(final String accessToken) { try{ HttpTransport transport = new NetHttpTransport(); AccessProtectedResource accessProtectedResource = new GoogleAccessProtectedResource(accessToken); Calendar.Builder builder = Calendar.builder(transport, new JacksonFactory()); builder.setApplicationName("My App Name"); builder.setHttpRequestInitializer(accessProtectedResource); JsonHttpRequestInitializer json = new JsonHttpRequestInitializer() { public void initialize(JsonHttpRequest request) { CalendarRequest calRequest = (CalendarRequest) request; calRequest.setKey(Common.API_KEY); calRequest.setOauthToken(accessToken); } }; builder.setJsonHttpRequestInitializer(json); Calendar calendarService= builder.build(); if(calendarService!= null) { return calendarService; } else return null; }catch (Exception e) { // TODO: handle exception e.getMessage(); } </code></pre> <p>After this i receive a Calendar object called as "calendarService".</p> <pre><code>public void getCalendarsList() { try { CalendarList calendarList = calendarService.calendarList().list().execute(); while (true) { for (CalendarListEntry calendarListEntry : calendarList.getItems()) { System.out.println(calendarListEntry.getSummary()); } String pageToken = calendarList.getNextPageToken(); if (pageToken != null &amp;&amp; !pageToken.equalsIgnoreCase("")) { calendarList = calendarService.calendarList().list().setPageToken(pageToken).execute(); } else { break; } } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } </code></pre> <p>This is copied from the Google Calendar API Documentation. Check this link <a href="http://code.google.com/apis/calendar/v3/using.html#retrieving_calendar_lists" rel="nofollow">here</a><br> But i am getting NullPointer Exception at the following line</p> <pre><code>CalendarList calendarList = calendarService.calendarList().list().execute(); </code></pre> <p>Please suggest something.</p> <p>Thanks</p>
 

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