Hi,
I am creating an application which parses an XML from the web and
displays the items of a <title>tag in another ListView. Basically i
want to know an effecient way of using ListView all throughout the
application.
Ex:
Part
1
Part 2 Part 3
My Bookshelf -----Click----->Opens another ListView ---->Book 1-------
> Click------> ListView----->First Page
Options
Book 2
Help
Exit
I am able to go from part 1 to part 2. but not from part 2 to part3. I
might be doing some mistake in part 1 to part 2 itself.
Please advise. I am very confused and stuck.
My code:
package com.vijay.MogoMenu;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
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.SAXException;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
public class MogoMenu extends ListActivity {
ArrayList linksArray = new ArrayList();
ArrayList itemsArray = new ArrayList();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>
(this,android.R.layout.simple_list_item_1, MENU_NAMES));
}
private static final String[] MENU_NAMES = new String[] {
"My Bookshelf",
"On the Go",
"Options",
"Help",
};
public void onItemClick(AdapterView parent, View v, int position,
long id) {
// Pre-load the image then start the animation
System.out.println("On Item Click" +position);
if(position == 0)
{
DownloadRSS("http://xmlgwdev.lotusbookworks.com/?
acctid=0bfHgPce7k:Hiw6hsB4fx&listID=1");
}
else if(position == 3)
{
setContentView(R.layout.help);
}
}
public void onClick(View v) {
System.out.println("On View Click");
}
public InputStream OpenHttpConnection(String urlString) throws
IOException
{
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
System.out.println("Opening Connection");
if (!(conn instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");
try
{
System.out.println("Obtaining CONNECTION");
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
System.out.println("Connecting");
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK)
{
System.out.println("SUPER CONNECTION");
in = httpConn.getInputStream();
System.out.println("Bitmap puttin into IMG1");
}
}
catch (Exception ex)
{
throw new IOException("Error connecting");
}
return in;
}
/*Download XML RSS feed*/
@SuppressWarnings("unchecked")
private void DownloadRSS(String URL)
{
InputStream in = null;
try {
in = OpenHttpConnection(URL);
Document doc = null;
DocumentBuilderFactory dbf =
DocumentBuilderFactory.newInstance();
DocumentBuilder db;
try {
db = dbf.newDocumentBuilder();
doc = db.parse(in);
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
doc.getDocumentElement().normalize();
itemsArray.clear();
linksArray.clear();
String strTitle = null;
String strLink = null;
NodeList itemNodesList = doc.getElementsByTagName("a");
for (int i = 0; i < itemNodesList.getLength(); i++) {
Node itemNode = itemNodesList.item(i);
if (itemNode.getNodeType() == Node.ELEMENT_NODE)
{
//---convert the Node into an Element---
Element itemElement = (Element) itemNode;
//---get all the TITLES element under the
NodeList titleNodes =
(itemElement).getElementsByTagName("a");
Element titleElement = (Element) titleNodes.item
(0);
//---get all the child nodes under the <title>
element---
NodeList textitemNodes =
((Node) titleElement).getChildNodes();
//---retrieve the text of the <title> element---
strTitle = ((Node) textitemNodes.item
(0)).getNodeValue();
itemsArray.add(strTitle);
System.out.println("ITEM : "+strTitle);
}
}
for (int i = 0; i < itemNodesList.getLength(); i++) {
strLink = ((Element) itemNodesList.item(i)).getAttribute
("href");
linksArray.add(strTitle);
System.out.println("URL LINK: "+strLink);
}
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
setListAdapter(new ArrayAdapter
(this,android.R.layout.simple_list_item_1,itemsArray));
}
}
Thanks,
Vijay.C
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