The document provides information about web services and mobile applications. It discusses: - Old style web services using SOAP and WSDL to define interfaces and interactions. Newer RESTful web services use HTTP methods and URI patterns instead of WSDL. - Examples of building RESTful web APIs to store high scores from a mobile game app and retrieving leaderboards. The APIs were implemented with PHP and hosted on OpenShift. - Suggestions for small practice projects like building web services for simple functions like hello world and converting temperatures, then calling them from mobile apps. Code examples and resources are provided.

1. Web Service for Mobile
5 jan 2013 @ Sripatum University
Anuchit Chalothorn
anoochit@gmail.com

2. About
● Not a Teacher or Instructor
● Not a Programmer or Developer
● Senior Software Engineer at SIPA
● Content writer not speaker
● I use Linux :)

3. Rules
● You can leave every time.
● If you don't understand and you don't want to
ask you can leave.
● If you want to learn by yourself and I'll give
you a resources, you can leave.
● If you don't understand at all and everything
as I said, you can leave and I'll give a
resources, you can learning by yourself.

4. Quote
“If you cannot do great things, do small things
in a great way” - Napoleon Hill

5. You should know
● Android
● Java
● PHP or some PHP Framework
● Database System
● Service Oriented Architecture (SOA)
● HTTP Services
● XML, JSON, Data Parsing

6. Web Service
A Web service is a method of communication
between two electronic devices over the World
Wide Web. A Web service is a software
function provided at a network address over the
web or the cloud, it is a service that is "always
on" as in the concept of utility computing.

7. Web Service
Two major classes of Web services
● REST-compliant Web services
● other

8. Web Services in old fashion
It has an interface described in a machine-
processable format (specifically Web Services
Description Language, known by the acronym
WSDL)

9. Interact
Systems interact with the Web service in a
manner prescribed by its description using
SOAP messages, typically conveyed using
HTTP with an XML serialization in conjunction
with other Web-related standards.

11. Simple diagram
Yellow Pages WSDL
WSDL
WSDL
Requester Provider
SOAP
Requester ask or search yellow pages which address and how to talk with provider. The yellow pages
'll send the response by using WSDL how to talk which provide by Provider to the requester.
Requester receives the address and methods then communicate with Provider.

12. Quote
"HTTP + XML = SOAP" - W3CSchool

13. SOAP Sample
If you want to request to SOAP server, you
must know
● URL
○ http://example.com/service.php
● WSDL
○ http://example.com/service.php?wsdl
● Soap Action
○ http://example.com/service.php/HelloWorld
● Method
○ HelloWorld
● Your data to sent

14. SOAP Request
POST /InStock HTTP/1.1
Host: www.example.org
Content-Type: application/soap+xml; charset=utf-8
Content-Length: nnn
<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
<soap:Body xmlns:m="http://www.example.org/stock">
<m:GetStockPrice>
<m:StockName>IBM</m:StockName>
</m:GetStockPrice>
</soap:Body>
</soap:Envelope>

15. SOAP Response
HTTP/1.1 200 OK
Content-Type: application/soap+xml; charset=utf-8
Content-Length: nnn
<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">
<soap:Body xmlns:m="http://www.example.org/stock">
<m:GetStockPriceResponse>
<m:Price>34.5</m:Price>
</m:GetStockPriceResponse>
</soap:Body>
</soap:Envelope>

16. Web services in new fashion
Web API is a development in Web services
where emphasis has been moving away from
SOAP based services towards
representational state transfer (REST) based
communications.

17. RESTFul / REST API
a style of software architecture for distributed
systems such as the WWW. The REST
language uses nouns and verbs, and has an
emphasis on readability. Unlike SOAP, REST
does not require XML parsing and does not
require a message header to and from a
service provider.

18. Concept
● the base URI for the web service, such as
http://example.com/resources/
● the Internet media type of the data
supported by the web service.
● the set of operations supported by the web
service using HTTP methods (e.g., GET,
PUT, POST, or DELETE).
● The API must be hypertext driven.

19. Example URI
● http://example.org/user/
● http://example.org/user/anuchit
● http://search.twitter.com/search.json?q=xxx

20. Example methods
Resource GET PUT POST DELETE
http://example.org/user list collection replace create delete
http://example.org/user/rose list data replace/ create ? / create delete

21. No "official" standard
There is no "official" standard for RESTful web
services, This is because REST is an
architectural style, unlike SOAP, which is a
protocol. Even though REST is not a standard,
a RESTful implementation such as the Web
can use standards like HTTP, URI, XML, etc.

22. Simple Diagram
GET /user/anuchit HTTP/1.1
Requester Provider
200 with some data

23. Data Format
XML
<?xml version="1.0"?>
<item>
<name>Anuchit Chalothorn</name>
<email>anoochit@gmail.com</email>
</item>
<item>
<name>Sira Nokyongthong</name>
<email>gumaraa@gmail.com</email>
</item>

24. Data Format
JSON
{
"item": [
{
"name": "Anuchit Chalothorn",
"email": "anoochit@gmail.com"
},
{
"name": "Sira Nokyongthong",
"email": "gumaraa@gmail.com"
}
]
}

25. Shortcut - Web Services design
● Choose method old style, new style
● Look around an eco-system
● Who'll using your services
● How to implementation
● Design and document

26. Mobile App & Web Services
http request
Data Req
Provider
(2) (1)
Data Parse Res Data
response
* This is your destiny you cannot change your future, accept using vendor sdk's

27. Case Study - Plus Clever
● Game (Client)
○ sum a set of numbers in to 1 digit
○ score by level calculate from time remain and levels
○ each level has 10 sub-levels
○ never ending game BUT maximum is 10 digits to
calculate
○ keep your high-score online (web service is here)
● Web Service (Server)
○ PaaS on OpenShift
○ PHP, CakePHP, MySQL

28. Case Study - Plus Clever
Enter Your Name
Dakota
Ask a player name in the first time and keep value in SQLite

29. Case Study - Plus Clever
Your Score
1,000,000
If player reach high score keep score in SQLite and publish score to server

30. Case Study - Plus Clever
World
Leaderboard
Xavier - 10,000,000
Dakota - 1,000,000
Luxor - 50,000
Keva - 6,000
Ask score server for world leader board.

31. Case Study - Plus Clever
● REST API
● Using JSON as data
● Using CakePHP to implement score service
● Put in the Cloud ~ OpenShift by RedHat

32. In Real Life
● Plus Clever in Google Play
○ http://tinyurl.com/plusclever
● Score server
○ https://rest-redlinemobi.rhcloud.com/score/

33. Code in GitHub
● Score Server
○ https://github.com/anoochit/rest-score
● Score Server Test
○ https://github.com/anoochit/rest-score-test
● Plus Clever Game
○ https://github.com/anoochit/plusclaver-game

34. Your Case Study - WattPad ?
I'm too old, anyone can describe this
● What is WattPad ?
● What is WattPad do ?
● Who are using WattPad ?
● How to use WattPad ?
...
...
...

35. Quote
“If you cannot do great things, do small things
in a great way” - Napoleon Hill

36. Small things for you
Make Web Services of this small things
● HelloWorld
● Echo your name
● Asking for Date Time
● Temperature Unit Converter
● Search Telephone Number

37. Small things for you
Make Mobile App by calling your web service
● HelloWorld
● Echo your name
● Asking for Date Time
● Temperature Unit Converter
● Search Telephone Number

38. PHP (native)
You can use json_encode() function to
generate JSON string from mix value like
associative array
$data = array("result"=>"hello","success"=>true);
echo json_encode($data);

39. Browser use GET method
if you want to test your RESTful web service by
sent another method, try this
● Advanced REST Client for Chrome
● REST Client for Firefox

40. Call Web Service
GET /user/anoochit
REST
Android
Server
200 OK with XML or JSON string
● HTTP request ● Check request method
● Method GET, POST, PUT or DELETE ● Parse data from URI
● Get BufferReader and pack into ● Process
"String" <= JSON String ● Return XML or JSON string
● Parse "String Key"
● Get your value

41. Small resources
● Thai Create Good Mobile Tutorial
○ http://www.thaicreate.com/mobile.html

42. 2 Hours
finish & present

43. Your Code
Check out an example for REST Server and
Mobile Client at
● https://github.com/anoochit/spurest

44. Thank You