Documentbuilder db newinstance newdocumentbuilder

DocumentBuilder db = DocumentBuilderFactory
. newInstance();
.newDocumentBuilder();
Document dom = db.parse(someHttpInputStream);
DOM – Document Object Model
Consuming RSS Feeds

Example : The tree in Figure 2 contains a set of item nodes.
Assume dom is the DOM-tree made by parsing the input stream returned by
an RSS aggregator.
Accessing item data could be done as follows
// define access to all nodes in the parse tree
Element treeElements = dom.getDocumentElement();
// look for individual news ("items" in this case)
// put items in a NodeList collection
NodeList itemNodes = treeElements.getElementsByTagName( "item" );
Reference:
16
DOM – Document Object Model
Consuming RSS Feeds

In particular, the often used java.net class HttpUrlConnection follows the next
steps:
1. Obtain a new HttpURLConnection
2. Prepare the request (URI including header, credentials, content, cook ies…)
3. Read the response (non-buffered stream returned by getInputStream() )
4. Disconnect as soon as response is read.
HTTP Processing in Android
Android ’ s handling of HTTP network resources is typically done
using either of the client-side included APIs
1. Standard Java network java.net package, and/or
2. Apache HttpClient library.
Consuming RSS Feeds
References:
17

In this project we will develop an application to expose on Android devices
the public-access RSS material aggregated by National Public Radio ( NPR ).
Internet
National Public Radio
RSS Web Feeds
Example. ‘ All things consider ed’
Consuming RSS Feeds
18

19
Step1 .
A little research shows that NPR supports a number of web feeds, among
them the following:
Example. NPR Project – Action Plan
Consuming RSS Feeds
Topic URL
Top Stories
U.S. News
World News
Business
Health & Science Arts
& Entertainment
Politics & Society
People & Places
Opinion

Step2.
We will display on a ListView
widget, a basic menu consisting
of a fixed set of topics (for
instance: Top Stories, US News,
World News, Business, etc)
We wait for the user to make a
selection. Once a category is
chosen its corresponding
headlines will be downloaded.
Choose
“Heal th &
Science”
Example. NPR Project – Action Plan
Consuming RSS Feeds
20

Step3 .
Again, a simple ListView box is used to
show the most current headlines from the
selected category (notice the TextSize is
now slightly smaller). The user can scroll
the list and click on a particular story.