Android XML Parsing Tutorial – Using DOMParser

Moving ahead from Android XML Parsing using SAXParser, here we are going to see about how to parse a XML using DOM Parser.
we are going to parse XML from net ( by passing URL ) not from local file or string.

The output looks similar to

example.xml ( http://www.androidpeople.com/wp-content/uploads/2010/06/example.xml )

[sourcecode language="xml"]
<maintag>
<item>
<name>AndroidPeople</name>
<website category="android">www.androidpeople.com</website>
</item>
<item>
<name>iPhoneAppDeveloper</name>
<website category="iPhone">www.iphone-app-developer.com</website>
</item>
</maintag>
[/sourcecode]

XMLParsingDOMExample.java

This is main activity class. when App. starts this file will be called first.
This file contains how to use DOM Parser to handle XML tags.

[sourcecode language="java"]
package com.androidpeople.xml.parsing;

import java.net.URL;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;

public class XMLParsingDOMExample extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

/** Create a new layout to display the view */
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(1);

/** Create a new textview array to display the results */
TextView name[];
TextView website[];
TextView category[];

try {

URL url = new URL(
"http://www.androidpeople.com/wp-content/uploads/2010/06/example.xml");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url.openStream()));
doc.getDocumentElement().normalize();

NodeList nodeList = doc.getElementsByTagName("item");

/** Assign textview array lenght by arraylist size */
name = new TextView[nodeList.getLength()];
website = new TextView[nodeList.getLength()];
category = new TextView[nodeList.getLength()];

for (int i = 0; i < nodeList.getLength(); i++) {

Node node = nodeList.item(i);

name[i] = new TextView(this);
website[i] = new TextView(this);
category[i] = new TextView(this);

Element fstElmnt = (Element) node;
NodeList nameList = fstElmnt.getElementsByTagName("name");
Element nameElement = (Element) nameList.item(0);
nameList = nameElement.getChildNodes();
name[i].setText("Name = "
+ ((Node) nameList.item(0)).getNodeValue());

NodeList websiteList = fstElmnt.getElementsByTagName("website");
Element websiteElement = (Element) websiteList.item(0);
websiteList = websiteElement.getChildNodes();
website[i].setText("Website = "
+ ((Node) websiteList.item(0)).getNodeValue());

category[i].setText("Website Category = "
+ websiteElement.getAttribute("category"));

layout.addView(name[i]);
layout.addView(website[i]);
layout.addView(category[i]);

}
} catch (Exception e) {
System.out.println("XML Pasing Excpetion = " + e);
}

/** Set the layout view to display */
setContentView(layout);

}
}

[/sourcecode]