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Android: Parsing XML with children and attributes using DOM

22 November 2012 By Nithya Vasudevan 14,541 views 2 Comments

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Contents

1 Project Description
2 Environment Used
3 Prerequisites
4 Create Android Project
5 Output
6 Project Folder Structure

Project Description

In the previous Android example here we saw how to parse a simple XML using DOM parser.
This example shows how to parse a XML containing element attributes, multi level child nodes using Android DOM parser.

Environment Used

JDK 6 (Java SE 6)
Eclipse Indigo IDE for Java EE Developers (3.7.1)
Android SDK 4.0.3 / 4.1 Jelly Bean
Android Development Tools (ADT) Plugin for Eclipse (ADT version 20.0.0)
Refer this link to setup the Android development environment

Prerequisites

HelloWorld Example
Android: Simple XML DOM parser

Create Android Project

Create a new Android Project and name it as “DOMParserAttrChildNodes”.
Enter the package name as “com.theopentutorials.android”.
Enter the Activity name as “DOMParserActivity”.
Click Finish.

Create XML file

In the project’s assets folder, create a new XML file and name it as “employees.xml” and copy the following.

<?xml version="1.0" encoding="UTF-8"?>
<employees>
	<employee id = "2163">
	    <name>Kumar</name>
		<department>Development</department>
		<type>Permanent</type>		
		<email>kumar@tot.com</email>
		<address>
	        <line1>1201 Main Rd</line1>
	        <city>Peoria</city>
	        <state>Illinois</state>
	        <zipcode>61606</zipcode>
   		</address>
	</employee>
	
	<employee id = "6743">
		<name>Ram</name>
		<department>DB</department>
		<type>Contract</type>		
		<email>ram@tot.com</email>
		<address>
	        <line1>163 Main Street</line1>
	        <city>Chennai</city>
	        <state>TN</state>
	        <zipcode>600001</zipcode>
   		</address>
	</employee>
	
	<employee id = "6763">
	    <name>Timmy</name>
		<department>Testing</department>
		<type>Permanent</type>		
		<email>timmy@tot.com</email>
		<address>
	        <line1>2163 1st Avenue</line1>
	        <city>Chicago</city>
	        <state>Illinois</state>
	        <zipcode>60631</zipcode>
   		</address>
	</employee>
</employees>

strings.xml

Open res/values/string.xml and replace it with following content.

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, DOMParserActivity!</string>
    <string name="app_name">DOMParserAttrChildNodes</string>
	<string name="button">Parse XML using DOM</string>
</resources>

XML layout files

This Android application uses two layout files; one for displaying the main layout containing ListView to display the result of DOM parser and another for defining the ListView item which contains a single TextView.
Open main.xml file in res/layout and copy the following content.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

 <Button
        android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/button" />
    
   <ListView
        android:id="@+id/employeeList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" 
       />
</LinearLayout>

Create a new layout file list_item.xml in res/layout and copy the following content.

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/title"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:textColor="#CC0033"
    android:textSize="16sp" />

Create Bean classes

Address.java

Create a new Java class “Address.java” in package “com.theopentutorials.android.beans”

package com.theopentutorials.android.beans;
public class Address {

	private String line;
	private String city;
	private String state;
	private long zipcode;

	public String getLine() {
		return line;
	}
	public void setLine(String line) {
		this.line = line;
	}
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public String getState() {
		return state;
	}
	public void setState(String state) {
		this.state = state;
	}
	public long getZipcode() {
		return zipcode;
	}
	public void setZipcode(long zipcode) {
		this.zipcode = zipcode;
	}	
}

Employee.java

Create a new Java class “Employee.java” in package “com.theopentutorials.android.beans”

package com.theopentutorials.android.beans;
public class Employee {
	private String name;
	private int id;
	private String department;
	private String type;
	private String email;
	private Address address;

	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getDepartment() {
		return department;
	}
	public void setDepartment(String department) {
		this.department = department;
	}
	public String getType() {
		return type;
	}
	public void setType(String type) {
		this.type = type;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	@Override
	public String toString() {
		return id + ": " + name + "\n" + department + "-" + type;
	}

	public String getDetails() {
		String result = id + ": " + name + "\n" + department + "-" + type
				+ "\n" + email + "\n" + "Address:\n" + address.getLine() + "\n"
				+ address.getCity() + ", " + address.getState() + " "
				+ address.getZipcode();
		return result;
	}

	public Address getAddress() {
		return address;
	}
	public void setAddress(Address address) {
		this.address = address;
	}
}

Create XMLDOMParser class

package com.theopentutorials.android.xml;

import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
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 org.xml.sax.SAXException;
import android.util.Log;

public class XMLDOMParser {
	//Returns the entire XML document 
	public Document getDocument(InputStream inputStream) {
		Document document = null;
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		try {
			DocumentBuilder db = factory.newDocumentBuilder();
			InputSource inputSource = new InputSource(inputStream);
			document = db.parse(inputSource);
		} catch (ParserConfigurationException e) {
			Log.e("Error: ", e.getMessage());
			return null;
		} catch (SAXException e) {
			Log.e("Error: ", e.getMessage());
			return null;
		} catch (IOException e) {
			Log.e("Error: ", e.getMessage());
			return null;
		}
		return document;
	}

	/*
	 * I take a XML element and the tag name, look for the tag and get
	 * the text content i.e for <employee><name>Kumar</name></employee>
	 * XML snippet if the Element points to employee node and tagName 
	 * is name I will return Kumar. Calls the private method 
	 * getTextNodeValue(node) which returns the text value, say in our 
	 * example Kumar. */
	public String getValue(Element item, String name) {
		NodeList nodes = item.getElementsByTagName(name);
		return this.getTextNodeValue(nodes.item(0));
	}

	private final String getTextNodeValue(Node node) {
		Node child;
		if (node != null) {
			if (node.hasChildNodes()) {
				child = node.getFirstChild();
				while(child != null) {
					if (child.getNodeType() == Node.TEXT_NODE) {
						return child.getNodeValue();
					}
					child = child.getNextSibling();
				}
			}
		}
		return "";
	}
}

Create DOMParserActivity class

package com.theopentutorials.android;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import com.theopentutorials.android.beans.Address;
import com.theopentutorials.android.beans.Employee;
import com.theopentutorials.android.xml.XMLDOMParser;
import android.app.Activity;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

public class DOMParserActivity extends Activity implements OnClickListener,
		OnItemClickListener {
	Button button;
	ListView listView;
	List<Employee> employees = null;

	// XML node names
	static final String ATTR_ID = "id";
	static final String NODE_EMP = "employee";
	static final String NODE_NAME = "name";
	static final String NODE_DEPT = "department";
	static final String NODE_TYPE = "type";
	static final String NODE_EMAIL = "email";
	static final String NODE_ADDR = "address";
	static final String NODE_LINE1 = "line1";
	static final String NODE_CITY = "city";
	static final String NODE_STATE = "state";
	static final String NODE_ZIP = "zipcode";

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

		findViewsById();
		button.setOnClickListener(this);
	}

	private void findViewsById() {
		button = (Button) findViewById(R.id.button);
		listView = (ListView) findViewById(R.id.employeeList);
	}

	public void onClick(View view) {
		XMLDOMParser parser = new XMLDOMParser();
		AssetManager manager = getAssets();
		InputStream stream;
		try {
			stream = manager.open("employees.xml");
			Document doc = parser.getDocument(stream);

			// Get elements by name employee
			NodeList nodeList = doc.getElementsByTagName(NODE_EMP);
			employees = new ArrayList<Employee>();
			/*
			 * for each <employee> element get text of name, department, type
			 * and email and line1, city, state, zipcode of <address> element.
			 */
			for (int i = 0; i < nodeList.getLength(); i++) {
				Element e = (Element) nodeList.item(i);

				Employee employee = new Employee();

				employee.setId(Integer.parseInt(e.getAttribute(ATTR_ID)));
				employee.setName(parser.getValue(e, NODE_NAME));
				employee.setDepartment(parser.getValue(e, NODE_DEPT));
				employee.setType(parser.getValue(e, NODE_TYPE));
				employee.setEmail(parser.getValue(e, NODE_EMAIL));

				Address address = new Address();
				address.setLine(parser.getValue(e, NODE_LINE1));
				address.setCity(parser.getValue(e, NODE_CITY));
				address.setState(parser.getValue(e, NODE_STATE));
				address.setZipcode(Long.parseLong(parser.getValue(e, NODE_ZIP)));
				employee.setAddress(address);

				employees.add(employee);
			}
			displayOutput();

		} catch (IOException e1) {
			e1.printStackTrace();
		}
	}

	private void displayOutput() {
		ArrayAdapter<Employee> adapter = new ArrayAdapter<Employee>(this,
				R.layout.list_item, employees);
		listView.setAdapter(adapter);
		listView.setOnItemClickListener(this);
	}

	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		Employee employee = employees.get(position);
		Toast.makeText(parent.getContext(), employee.getDetails(),
				Toast.LENGTH_LONG).show();
	}
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.theopentutorials.android"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="com.theopentutorials.android.DOMParserActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Output

Run your application

Project Folder Structure

The complete folder structure of this example is shown below.

Tags: Android 4 Examples, Android 4 icecream sandwich examples, Android 4.1 Jelly Bean Examples, Android Activity, Android ArrayAdapter Example, Android AssetManager, Android assets folder, Android DOM Parser Example, Android Examples, Android LinearLayout, Android ListView, Android TextView, Android XML DOM parser, Android XML layout, Android XML parser example

Endar
Can I use your tutorial for android with SDK 8?
Thanks
manju
Hi Nithya Vasudevan,
very nice tutorial for beginners, I liked the way it was first explained for simple parset and followed with multi level nodes. This helped me a lot in building my own xml parser.
Thanks a lot.
-regards,
Manju

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Android: Parsing XML with children and attributes using DOM

Project Description

Environment Used

Prerequisites

Create Android Project

Create XML file

strings.xml

XML layout files

Create Bean classes

Address.java

Employee.java

Create XMLDOMParser class

Create DOMParserActivity class

AndroidManifest.xml

Output

Project Folder Structure

Table of Contents

Popular Posts

Recent Comments

Views

Recent Posts

Android: Parsing XML with children and attributes using DOM

Project Description

Environment Used

Prerequisites

Create Android Project

Create XML file

strings.xml

XML layout files

Create Bean classes

Address.java

Employee.java

Create XMLDOMParser class

Create DOMParserActivity class

AndroidManifest.xml

Output

Project Folder Structure

Related posts:

Table of Contents

Popular Posts

Recent Comments

Views

Recent Posts