This document discusses consuming web services from mobile applications. It covers common mobile development challenges like limited screen space, CPU power, and bandwidth. It then provides an overview of technologies used to access web services like XML, JSON, REST, and SOAP. Examples are given of using AsyncTask and Services in Android to make asynchronous web service calls. Code demonstrations and additional resources are also referenced.

1. Consuming Web Services

2. Mobile • Develop • Design • Lead • Train • Troubleshoot
David Truxall, Ph.D.
@davetrux
http://blog.davidtruxall.com

3. https://github.com/davetrux/DevFest2013
Get the code

4. The Mobile Problem
(for developers)

5. Screen Real Estate

6. CPU Power

7. Memory Constrained

8. Network Bandwidth

9. Familiar?

10. XML
JSON
Web Services
Soap
REST

11. REpresentational State Transfer
GET
POST
PUT
DELETE

12. JavaScript Object Notation
[
{
"lastName": "Valdez",
"firstName": "Christian",
"gender": "m"
},
{
"lastName": "Alston",
"firstName": "Christie",
"gender": "f"
}
]

13. Where?
Google
Amazon
Twitter
Facebook
eBay
Baas Providers
programmableweb.com
Windows Azure
Government
LinkedIn
Flickr
Yahoo
Yelp
Your company
Build Some!

14. Web Services and Android

15. Lots of Options

16. Not in an Activity

17. AsyncTask vs. Service

18. AsyncTask

19. Activity Considerations
Active when request completes
Paused then resumed and request completes
Paused when request completes then resumed

20. Demo

21. Services
Not a daemon or Windows Service
Like a cron job or scheduled task

22. IntentService vs. Service

23. Activity
IntentService
IntentService
Web
Services
Intent w/URL & params
REST + JSON
Intent w/data

24. Code

25. What's Missing
Persistence
HTTP Headers
Error Handling
Security
Configuration

26. Performance
Data size
Paging
gzip

27. Google IO 2010 Presentation
Services Documentation
Code on Github
This Presentation
My Blog
Resources
@davetrux