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Hi I have this code for read xml file but it give error on this line :

String xml = parser.getXmlFromUrl(URL);

and this is my mail activity :

package com.example.xmlparsing;

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.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    static final String URL = "http://92.62.178.142/rss/bycat.aspx?count=20&catid=1";



    //    static final String _ITEM        = "item";
    //    static final String _TITLE       = "title";
    //    static final String _DESCRIPTION = "description";
    //    static final String _LINK        = "link";

    @Override
    protected 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("item");

        Integer count = nl.getLength();
        //String ITEM[] = new String[count];
        String TITLE[] = new String[count];
        String DESCRIPTION[] = new String[count];
        String LINK[] = new String[count];

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

            HashMap<String, String> map = new HashMap<String, String>();
            Element e = (Element) nl.item(i);
            map.put(TITLE[i], parser.getValue(e, TITLE[i]));
            map.put(DESCRIPTION[i], parser.getValue(e, DESCRIPTION[i]));
            map.put(LINK[i], parser.getValue(e, LINK[i]));

            menuItems.add(map);
        }

    }

}

and my XMLparser activity :

package com.example.xmlparsing;

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 I can sovle this ?? plz help meee