XML Parser in java

This is an sime XML parser that can be easily used and modified to your project.

XMLParser.java

import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
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 XMLParser {

 // constructor
 public XMLParser() {
 }

 /**
  * Getting XML from URL making HTTP request
  * @param url string
  * */

  public String getXmlFromUrl(String url) {

  String xml = null;
 
  try {
   // defaultHttpClient
   DefaultHttpClient httpClient = new DefaultHttpClient();
   HttpPost httpPost = new HttpPost(url);
   HttpResponse httpResponse = httpClient.execute(httpPost);
   HttpEntity httpEntity = httpResponse.getEntity();
   xml = EntityUtils.toString(httpEntity);
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  } catch (ClientProtocolException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }

  // return XML
  return xml;
 }

 /**
  * Getting XML DOM element
  * @param XML string
  * */
 public Document getDomElement(String xml){
  Document doc = null;
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  try {
   DocumentBuilder db = dbf.newDocumentBuilder();
   InputSource is = new InputSource();
          is.setCharacterStream(new StringReader(xml));
          doc = db.parse(is); 
   } 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 doc;
 }

 /** Getting node value
   * @param elem element
   */
  public final String getElementValue( Node elem ) {
      Node child;
      if( elem != null){
          if (elem.hasChildNodes()){
              for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
                  if( child.getNodeType() == Node.TEXT_NODE  ){
                      return child.getNodeValue();
                  }
              }
          }
      }
      return "";
  }

  /**
   * Getting node value
   * @param Element node
   * @param key string
   * */
  public String getValue(Element item, String str) {  
   NodeList n = item.getElementsByTagName(str);  
   return this.getElementValue(n.item(0));
  }
}

How to use it

import java.util.ArrayList;
import java.util.HashMap;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class AndroidXMLParsingActivity extends ListActivity {

 // All static variables
 static final String URL = "http://api.androidhive.info/pizza/?format=xml";
 // XML node keys
 static final String KEY_ITEM = "item"; // parent node
 static final String KEY_ID = "id";
 static final String KEY_NAME = "name";
 static final String KEY_COST = "cost";
 static final String KEY_DESC = "description";

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
  XMLParser parser = new XMLParser();
  String xml = parser.getXmlFromUrl(URL); // getting XML
  Document doc = parser.getDomElement(xml); // getting DOM element
  NodeList nl = doc.getElementsByTagName(KEY_ITEM);

  // looping through all item nodes <item>
  for (int i = 0; i < nl.getLength(); i++) {
   // creating new HashMap
   HashMap<String, String> map = new HashMap<String, String>();
   Element e = (Element) nl.item(i);
   // adding each child node to HashMap key => value
   map.put(KEY_ID, parser.getValue(e, KEY_ID));
   map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
   map.put(KEY_COST, "Rs." + parser.getValue(e, KEY_COST));
   map.put(KEY_DESC, parser.getValue(e, KEY_DESC));

   // adding HashList to ArrayList
   menuItems.add(map);
  }

  // Adding menuItems to ListView
  ListAdapter adapter = new SimpleAdapter(this, menuItems,
    R.layout.list_item,
    new String[] { KEY_NAME, KEY_DESC, KEY_COST }, new int[] {
      R.id.name, R.id.desciption, R.id.cost });

  setListAdapter(adapter);

  // selecting single ListView item
  ListView lv = getListView();
  lv.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> parent, View view,
     int position, long id) {
    // getting values from selected ListItem
    String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
    String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
    String description = ((TextView) view.findViewById(R.id.desciption)).getText().toString();

    // Starting new intent
    Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
    in.putExtra(KEY_NAME, name);
    in.putExtra(KEY_COST, cost);
    in.putExtra(KEY_DESC, description);
    startActivity(in);
   }
  });
 }
}