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Android xml parser

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XML Parsing:

  • A parser is a piece of program that takes a physical representation of some data and converts it into an in-memory form for the program as a whole to use.
  • Parsers are used everywhere in software.
  • An XML parser is a software library or package that provides interfaces for client applications to work with an XML document.
  •  parsing of xml sax process
  • An XML Parser is a parser that is designed to read XML and create a way for programs to use XML.
 flow diagram of xml parser flow diagram of xml sax parser
android xml parser sample code

Types of XML Parsers

  • These are the two main types of XML Parsers:
    • DOM
    • SAX

1. DOM (Document Object Model)

  • A DOM document is an object which contains all the information of an XML document. It is composed like a tree structure. The DOM Parser implements a DOM API. This API is very simple to use.

2. SAX (Simple API for XML)

  • SAX (Simple API for XML) is an event-driven online algorithm for parsing XML documents, with an API developed by the XML-DEV mailing list.
  • SAX provides a mechanism for reading data from an XML document that is an alternative to that provided by the Document Object Model (DOM).
  • The SAX parser cannot be used to create the XML file, It can be used to parse the xml file only.

Advantage of SAX Parser over DOM:

  • It consumes less memory than DOM.

Disadvantages of SAX:

  • We have no random access to an XML document since it is processed in a forward-only manner

Example of android SAX Xml parsing


  • Drag the one textview from the pallete.
  • Now the activity_main.xml file will look like this:
  • File: activity_main.xml
<RelativeLayout xmlns:androclass=""  
    tools:context=".MainActivity" >  
        android:text="TextView" />  
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xml document

  • Create an xml file named file.xml inside the assets directory of your project.
  • File: file.xml
<?xml version="1.0"?>  
<name>Sachin Kumar</name>  
<name>Rahul Kumar</name>  
<name>John Mike</name>  
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Activity class

  • Now write the code to parse the xml using sax parser.
  • File:
package com.wikitechy.saxxmlparsing;  
import javax.xml.parsers.SAXParser;  
import javax.xml.parsers.SAXParserFactory;  
import org.xml.sax.Attributes;  
import org.xml.sax.SAXException;  
import org.xml.sax.helpers.DefaultHandler;  
import android.os.Bundle;  
import android.widget.TextView;  
public class MainActivity extends Activity {  
TextView tv;  
public void onCreate(Bundle savedInstanceState) {  
try {  
SAXParserFactory factory = SAXParserFactory.newInstance();  
SAXParser saxParser = factory.newSAXParser();  
DefaultHandler handler = new DefaultHandler() {  
boolean name = false;  
boolean salary = false;  
public void startElement(String uri, String localName,String qName,  
Attributes attributes) throws SAXException {  
if (qName.equalsIgnoreCase("name"))  
name = true;  
if (qName.equalsIgnoreCase("salary"))  
salary = true;  
}//end of startElement method  
public void endElement(String uri, String localName,  
String qName) throws SAXException {  
public void characters(char ch[], int start, int length) throws SAXException {  
if (name) {  
tv.setText(tv.getText()+"\n\n Name : " + new String(ch, start, length));  
name = false;  
if (salary) {  
tv.setText(tv.getText()+"\n Salary : " + new String(ch, start, length));  
salary = false;  
}//end of characters  
};//end of DefaultHandler object  
InputStream is = getAssets().open("file.xml");  
saxParser.parse(is, handler);  
} catch (Exception e) {e.printStackTrace();}  
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 output of sax parser

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