Friday, April 15, 2011

XML Parsing Example

XMLParsingExample.java


package com.androidpeople.xml.parsing;

import java.net.URL;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;

public class XMLParsingExample extends Activity {

/** Create Object For SiteList Class */
SitesList sitesList = null;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

/** 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 {

/** Handling XML */
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();

/** Send URL to parse XML Tags */
URL sourceUrl = new URL(
"http://www.androidpeople.com/wp-content/uploads/2010/06/example.xml");

/** Create handler to handle XML Tags ( extends DefaultHandler ) */
MyXMLHandler myXMLHandler = new MyXMLHandler();
xr.setContentHandler(myXMLHandler);
xr.parse(new InputSource(sourceUrl.openStream()));

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

/** Get result from MyXMLHandler SitlesList Object */
sitesList = MyXMLHandler.sitesList;

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

/** Set the result text in textview and add it to layout */
for (int i = 0; i < sitesList.getName().size(); i++) { name[i] = new TextView(this); name[i].setText("Name = "+sitesList.getName().get(i)); website[i] = new TextView(this); website[i].setText("Website = "+sitesList.getWebsite().get(i)); category[i] = new TextView(this); category[i].setText("Website Category = "+sitesList.getCategory().get(i)); layout.addView(name[i]); layout.addView(website[i]); layout.addView(category[i]); } /** Set the layout view to display */ setContentView(layout); } } MyXMLHandler.java package com.androidpeople.xml.parsing; import org.xml.sax.Attributes; import org.xml.sax.SAXException; import org.xml.sax.helpers.DefaultHandler; public class MyXMLHandler extends DefaultHandler { Boolean currentElement = false; String currentValue = null; public static SitesList sitesList = null; public static SitesList getSitesList() { return sitesList; } public static void setSitesList(SitesList sitesList) { MyXMLHandler.sitesList = sitesList; } /** Called when tag starts ( ex:- AndroidPeople
* -- )*/
@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {

currentElement = true;

if (localName.equals("maintag"))
{
/** Start */
sitesList = new SitesList();
} else if (localName.equals("website")) {
/** Get attribute value */
String attr = attributes.getValue("category");
sitesList.setCategory(attr);
}

}

/** Called when tag closing ( ex:- AndroidPeople
* --
)*/
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {

currentElement = false;

/** set value */
if (localName.equalsIgnoreCase("name"))
sitesList.setName(currentValue);
else if (localName.equalsIgnoreCase("website"))
sitesList.setWebsite(currentValue);

}

/** Called to get tag characters ( ex:- AndroidPeople
* -- to get AndroidPeople Character ) */
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {

if (currentElement) {
currentValue = new String(ch, start, length);
currentElement = false;
}

}

}



SitesList.java

package com.androidpeople.xml.parsing;

import java.util.ArrayList;

/** Contains getter and setter method for varialbles */
public class SitesList {

/** Variables */
private ArrayList name = new ArrayList();
private ArrayList website = new ArrayList();
private ArrayList category = new ArrayList();


/** In Setter method default it will return arraylist
* change that to add */

public ArrayList getName() {
return name;
}

public void setName(String name) {
this.name.add(name);
}

public ArrayList getWebsite() {
return website;
}

public void setWebsite(String website) {
this.website.add(website);
}

public ArrayList getCategory() {
return category;
}

public void setCategory(String category) {
this.category.add(category);
}

}

2 comments:

  1. Hi,
    I tried your code. But it is giving an exception.
    Siteslist is coming out to be null and giving an exception while trying to retrieve the size.

    ReplyDelete
  2. This comment has been removed by the author.

    ReplyDelete