Connecting to Web Services on Android June 2 2010

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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Connecting to Web Services on Android June 2 2010

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