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This article introduces the relevant knowledge of "how to realize the Android XML feed". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

It hides some internal state by allowing dates and links to be accessed as simple objects while representing them as strongly typed objects (de > java.util.Datede > and de > java.net.URLde >). It is a typical Value Object, so it implements de > equals () de > and de > hashCode () de > based on its internal state. It also implements the de > Comparablede > interface, so you can use it to sort (by date). In practice, the data in the feed is always ordered because it is no longer necessary to sort.

Each parser implementation needs to provide a URL to the Androidster feed and use it to open an HTTP connection to the Androidster site. This common behavior is naturally modeled in Java code, and we use an abstract base class, as shown in.

Basic feed parser class

Java Code:

Public abstract class BaseFeedParser implements FeedParser {/ / names of the XML tags static final String PUB_DATE = "pubDate"; static final String DESCRIPTION = "description"; static final String LINK = "link"; static final String TITLE = "title"; static final String ITEM = "item"; final URL feedUrl; protected BaseFeedParser (String feedUrl) {try {this.feedUrl = new URL (feedUrl);} catch (MalformedURLException e) {throw new RuntimeException (e);}} protected InputStream getInputStream () {try {return feedUrl.openConnection (). GetInputStream () } catch (IOException e) {throw new RuntimeException (e);}

The base class stores de > feedUrlde > and uses it to open a de > java.io.InputStreamde >. If anything goes wrong, it throws a de > RuntimeExceptionde >, causing the application to fail. The base class also defines some simple constants for the name of the tag. Shows some sample content in the feed so that you can understand the importance of these tags.

Sample XML feed

Java Code:

< ?xml version="1.0" encoding="UTF-8"? >

< !-- generator="FeedCreator 1.7.2" -- >

< rss version="2.0" >

< channel >

< title >

Android_news

< /title >

< description >

Android_news

< /description >

< link >

< /link >

< lastBuildDate >

Sun, 19 Apr 2009 19:43:45 + 0100

< /lastBuildDate >

< generator >

FeedCreator 1.7.2

< /generator >

< item >

< title >

Samsung S8000 to Run Android, Play DivX, Take Over the World

< /title >

< link >

< /link >

< description >

More details have emerged on the first Samsung handset

To run Android. A yet-to-be announced phone called the S8000 is being

Reported...

< /description >

< pubDate >

Thu, 16 Apr 2009 07:18:51 + 0100

< /pubDate >

< /item >

< item >

< title >

Android Cupcake Update on the Horizon

< /title >

< link >

< /link >

< description >

After months of discovery and hearsay, the Android

Build that we have all been waiting for is about to finally make it

Out...

< /description >

< pubDate >

Tue, 14 Apr 2009 04:13:21 + 0100

< /pubDate >

< /item >

< /channel >

< /rss >

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