The Developer Wing Gone Mad!

Thu 21 Sep 2006

Hey Everyone,

Time for another post. I know it's been awhile but I've been pretty heavy into the Google API stuff. Honestly was kinda tricky to work with a first but I finally might be onto it... yeah, I'm just a bit of a slow learner I guess

In my last post I briefly mentioned using the Java Client Library. I've now got some code examples that might help some people who might have bumped into some of the same issues I was having (mostly grabbing an individual event from the Google Calendar). We are working on building a free online application called YourTeam. It's going to combine a community for Hockey Coaches, Players and Parents and also a Private Team area for teams to stay informed and have fun! If you'd like to read all about it and how excited we are about the new beta release about to come out, click here to read my brothers post!

Here is the code that I was pulling my hair out for a few days over. These examples use the client library and are Java Server Pages. Enjoy! I hope they help. You will have to replace a few variables to get it working with your own code (ie: ACCOUNTNAME is your Google account name)

Adding an Event to the Google Calendar:

PLAIN TEXT

JAVA:

1. try{
2.   //get connection
3.   URL feedUrl = new URL("http://www.google.com/calendar/feeds/ACCOUNTNAME/private/full");
4.   GoogleService myService = new GoogleService("cl", str_service);
5.   myService.setUserCredentials(ACCOUNTNAME, ACCOUNTPASSWORD);
6.                        
7.   //create event here
8.   URL postUrl = new URL("http://www.google.com/calendar/feeds/"+str_email+"/private/full");
9.   EventEntry myEntry = new EventEntry();
10.   myEntry.setTitle(new PlainTextConstruct(request.getParameter("event_name")));
11.   myEntry.setContent(new PlainTextConstruct(request.getParameter("event_desc")));
12.  
13.   //these are your date values for the calendar   
14.   DateTime startTime = DateTime.parseDateTime("2006-09-14T15:00:00-08:00");
15.   DateTime endTime = DateTime.parseDateTime("2006-09-14T17:00:00-08:00");
16.                        
17.   When eventTimes = new When();
18.   eventTimes.setStartTime(startTime);
19.   eventTimes.setEndTime(endTime);
20.   myEntry.addTime(eventTimes);
21.            
22.   Where eventWhere = new Where();
23.   eventWhere.setValueString(request.getParameter("event_location"));
24.   myEntry.addLocation(eventWhere);
25.            
26.   // Send the request and receive the response:
27.   EventEntry insertedEntry = (EventEntry)myService.insert(postUrl, myEntry);
28.   str_msg="Event Added Successfully.";
29. }
30. catch(Exception ex){
31.     System.out.println("google ad event ex:"+ex);
32.     str_msg="Error adding Google Calendar Event:"+ex;
33. }

Getting a Date Range of Events from the Google Calendar:
Note: This code might not compile, I tried to take out a lot of code to shorten it but it should be a good starting point.

PLAIN TEXT

JAVA:

1. try{
2.     //get connection
3.     URL feedUrl = new URL("http://www.google.com/calendar/feeds/ACCOUNTNAME/private/full");
4.     CalendarQuery myQuery = new CalendarQuery(feedUrl);
5.                                
6.     String str_start="2006-09-14T00:00:00";
7.     String str_end="2006-09-21T23:59:59";
8.                                
9.     myQuery.setMinimumStartTime(DateTime.parseDateTime(str_start));
10.     myQuery.setMaximumStartTime(DateTime.parseDateTime(str_end));
11.     myQuery.addCustomParameter(new Query.CustomParameter("orderby", "starttime"));
12.     myQuery.addCustomParameter(new Query.CustomParameter("sortorder", "ascending"));
13.     myQuery.addCustomParameter(new Query.CustomParameter("singleevents", "true"));
14.                                
15.     CalendarService myService = new CalendarService(str_service);
16.     myService.setUserCredentials(ACCOUNTNAME, ACCOUNTPASS);
17.                                
18.     // Send the request and receive the response:
19.     Feed resultFeed = (Feed)myService.query(myQuery, Feed.class);
20.                                
21.     new EventFeed().declareExtensions(myService.getExtensionProfile());
22.             EventFeed calFeed = (EventFeed) myService.query(myQuery,EventFeed.class);
23.                            
24.              EventEntry calEntry = null;
25.            
26.             if (calFeed.getEntries().size()> 0) {
27.                          java.util.List lTimes = null;
28.                          java.util.List lLocs = null;
29.                                    
30.                 for (int n=0; n<calFeed.getEntries().size();n++){
31.                       calEntry = (EventEntry) calFeed.getEntries().get(n);
32.                       
33.                                //grabs description for event
34.                                TextContent tc = (TextContent)calEntry.getContent();
35.               PlainTextConstruct ptc = (PlainTextConstruct)tc.getContent();
36.                                        
37.              calEntry.getTitle().getPlainText();
38.                               lTimes=calEntry.getTimes();
39.                      When when =null;
40.                
41.                                for (java.util.Iterator iterator1 = lTimes.iterator();iterator1.hasNext();) {
42.                       when = (When)iterator1.next();
43.             strTempStart=when.getStartTime().toUiString();
44.             strTempStart=strTempStart.substring(strTempStart.indexOf(" "),strTempStart.length());
45.                                        
46.                     strTempEnd=when.getEndTime().toUiString();
47.                     strTempEnd=strTempEnd.substring(strTempEnd.indexOf(" "),strTempEnd.length());
48.             strTempEnd=convertTime(strTempEnd);
49.               }
50.                            
51.                       lLocs=calEntry.getLocations();
52.                       for (java.util.Iterator iterator1 = lLocs.iterator();iterator1.hasNext();) {
53.                       Where where = (Where)iterator1.next();
54.             where.getValueString();
55.               }
56.                            }
57.     }
58.     catch(Exception ex){
59.         System.out.println("google view events ex:"+ex);
60.         str_msg="Error viewing Team Google Calendar:"+ex;
61.     }

Editing a Google Calendar Event:

PLAIN TEXT

JAVA:

1. //get connection
2. CalendarService calendarService = new CalendarService(str_service);
3. calendarService.setUserCredentials(ACCOUNTNAME, ACCOUNTPASSWORD);
4.  
5. //call calEntry.getSelfLink().getHref() to get the url
6. //example: http://www.google.com/calendar/feeds/ACCOUNTNAME/private/full/d1gn05stk3175uthp30s3et3is 
7. URL entryUrl = new URL(str_event_url);
8.            
9. // Mark the feed as an Event feed:
10. final ExtensionProfile profile = calendarService.getExtensionProfile();
11. new EventFeed().declareExtensions(profile);
12. final EventFeed feed = (EventFeed)calendarService.getFeed(entryUrl, EventFeed.class);
13.             
14. EventEntry retrievedEntry = (EventEntry)calendarService.getEntry(entryUrl, EventEntry.class);
15. retrievedEntry.setTitle(new PlainTextConstruct(request.getParameter("event_name")));
16. retrievedEntry.setContent(new PlainTextConstruct(request.getParameter("event_desc")));
17.  
18. //same date format as adding       
19. DateTime startTime = DateTime.parseDateTime(str_start_time);
20. DateTime endTime = DateTime.parseDateTime(str_end_time);
21.            
22. java.util.List lTimes=retrievedEntry.getTimes();
23. When when =null;
24. for (java.util.Iterator iterator1 = lTimes.iterator();iterator1.hasNext();) {
25.       when = (When)iterator1.next();
26.       when.setStartTime(startTime);
27.       when.setEndTime(endTime);
28. }
29.            
30. java.util.List lLocs=retrievedEntry.getLocations();
31. for (java.util.Iterator iterator1 = lLocs.iterator();iterator1.hasNext();) {
32.               Where where = (Where)iterator1.next();
33.      where.setValueString(request.getParameter("event_location"));
34. }
35.            
36. // Update the info
37. // call retrievedEntry.getEditLink().getHref() to get the edit url like this: http://www.google.com/calendar/feeds/info%40webscope.ca/private/full/d1gn05stk3175uthp30s3et3is/63294552679
38. URL editUrl = new URL(str_edit_event_url);
39. EventEntry updatedEntry = (EventEntry)calendarService.update(editUrl, retrievedEntry);
40. str_msg="Event Updated Successfully.";

So, hopefully that code can help someone out there. It might be a bit messy and long to look at but if you grab it and use it along with the Tutorials from Google I hope it can start working. Up next for me will be deleting Google Calendar Events from our webapp (YourTeam) and then hopefully some other enhancements!

So, if anyone has any questions about the information above let me know and I'll try my best and if anyone knows any hockey coaches, players or fans out there that are looking for a great, fun team software package send them to YourTeam!

Cheers,
Adrian

 

5 Responses to “Using the Java Client Library with Google Calendar API - PART 2”

1. Andie Says:
   November 16th, 2006 at 3:33 pm

   Thanks, this really helped me in the development of a simple app that downloads the events for the next four weeks, and lets you add events offline that are uploaded when you come back online. Please post more code examples when you have em!

   cheers
   /Andie

2. Adrian Nadeau Says:
   December 1st, 2006 at 10:39 pm

   No problem, glad it helped out.

   – Adrian

3. MikeR Says:
   March 5th, 2007 at 6:08 am

   Hi,

   Your code about the date range query will probably help me fix a bug in my code (use the extensions!).

   One question though, the query is executed twice in your code, is there a reason for this or just a copy/paste error?

   Here is the code I’m talking about:

   // Send the request and receive the response:

   Feed resultFeed = (Feed)myService.query(myQuery, Feed.class);

   new EventFeed().declareExtensions(myService.getExtensionProfile());
   EventFeed calFeed = (EventFeed) myService.query(myQuery,EventFeed.class);

4. anadeau Says:
   March 5th, 2007 at 9:00 am

   Hello Mike,

   That’s a good question. It’s been quite awhile since I worked on the Google Calendar API code. I think the first line:

   Feed resultFeed = (Feed)myService.query(myQuery, Feed.class);

   has to be there but I guess you could try it without. Obviously if it doesn’t have to be there it would be a good idea to remove it, one less call. Let me know if you try it without and I can update the code also.

   Adrian

5. MikeR Says:
   March 5th, 2007 at 5:21 pm

   Hi,

   I tried and could get it to work even without the extensions.
   Turns out the projection of my URL was basic instead of full. YMMV but the first link should be safe to remove, the extension line might work, you’ll have to test it

   // Send the request and receive the response:
   /************************
   Feed resultFeed = (Feed)calendarService.query(myQuery, Feed.class);

   new EventFeed().declareExtensions(calendarService.getExtensionProfile());
   *********************/

   calFeed = (EventFeed)
   calendarService.query(myQuery,EventFeed.class);

Leave a Reply