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Connecting to
Web Services on Android




       Sean Sullivan
       June 2, 2010
HTTP request


HTTP response
•   HTTP
•   XML
•   JSON
•   OAuth
+ HTTP
Option 1
  • java.net.URL
  • java.net.HttpURLConnection
Option 2
  • HttpClient 4.0 API
HttpClient 4.0 API


•   org.apache.http.client.HttpClient
•   org.apache.http.impl.client.DefaultHttpClient
HttpClient 4.0 API

• org.apache.http.client.methods.HttpGet
• org.apache.http.client.methods.HttpPost
• org.apache.http.client.methods.HttpPut
• org.apache.http.client.methods.HttpDelete
HttpClient 4.0 API

•   org.apache.http.HttpResponse
•   org.apache.http.StatusLine
•   org.apache.http.HttpEntity
•   org.apache.http.utils.EntityUtils
HttpClient programming

• HTTP response status code
• I/O exceptions
• timeouts
• gzip
HttpClient programming

synchronous invocation
  public HttpResponse execute(HttpUriRequest request)




asynchronous invocation
  public HttpResponse execute(HttpUriRequest request,

                             ResponseHandler handler)
UI programming

• user clicks on button
• onClick listener
• Don’t block the UI thread!
• Tip: use java.lang.Runnable
Response formats

• XML
• JSON
• RSS, Atom
• other
JSON processing
• json.org package
• Google GSON library
• XStream + Jettison
                   *


• json-lib
        *




                        * does not work on Android 1.x
XML processing
• org.w3c.dom package (DOM)
• org.xml.sax package (SAX)
• org.xmlpull package (XPP)
• XStream
• JDOM
• Apache XmlBeans*

                         * does not work on Android 1.x
RSS and Atom

• Rome library *
• Apache Abdera library   *




                              * does not work on Android 1.x
Client libraries

    code.google.com/p/jfireeagle

    code.google.com/p/jpoco

    code.google.com/p/meetup-java-client
Client libraries
  code.google.com/p/gdata-java-client


  code.google.com/p/upcoming-java-client


  flickrj.sourceforge.net
Conclusion

• HttpClient API
• use XStream for XML processing
• use Google GSON for JSON processing
• OAuth has a learning curve
Thank you

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