Я разрабатываю приложение для чтения RSS для Android, и у меня возникла проблема с получением содержимого HTML из узла описания.
Я попытался получить данные из следующего XML.
<description>
<p><a href="http://in.news.yahoo.com/search-arizona-girl-6-turns-back-her-tucson-021230195.html">
<img src="http://l.yimg.com/bt/api/res/1.2/t8X__zdk6shihpWw0Nenfw--/YXBwaWQ9eW5ld3M7Zmk9ZmlsbDtoPTg2O3B4b2ZmPTUwO3B5b2ZmPTA7cT04NTt3PTEzMA--/http://media.zenfs.com/en_us/News/Reuters/2012-04-24T021230Z_1_CDEE83N064W00_RTROPTPpackage com.satyampv.dsta;
import java.util.ArrayList;
import java.util.HashMap;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import android.app.ListActivity;
import android.os.Bundle;
import android.text.util.Linkify;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class AstroRssActivity extends ListActivity {
/** Called when the activity is first created. */
//static final String URL = "http://findyourfate.com/rss/dailyhoroscope-feed.asp?sign=Taurus";
//static final String URL = "http://my.horoscope.com/astrology/daily-horoscopes-rss.html";
static final String URL = "http://in.news.yahoo.com/rss/crime";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_TITLE = "title";
static final String KEY_DESC = "description";
static final String KEY_LINK = "link";
@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.getDocumentElement(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_TITLE, parser.getValue(e, KEY_TITLE));
map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
map.put(KEY_LINK,parser.getValue(e, KEY_LINK));
// adding HashList to ArrayList
menuItems.add(map);
}
// Adding menuItems to ListView
ListAdapter adapter = new SimpleAdapter(this, menuItems,
R.layout.list_item,
new String[] { KEY_TITLE, KEY_DESC, KEY_LINK }, new int[] {
R.id.name, R.id.desciption, R.id.link });
setListAdapter(adapter);
USA-MISSING-ARIZONA.JPG"
width="130" height="86" alt="Handout photo of Isabel Mercedes Celis" align="left" title="Handout photo of Isabel Mercedes Celis" border="0" />
</a>
TUCSON, Arizona (Reuters) - The search for a missing 6-year-old Arizona girl who a authorities said may have been snatched from her bedroom in Tucson entered its third day on Monday as search dogs shifted investigators' attention back to the child's home. The parents of first-grader Isabel Mercedes Celis told detectives she was last seen on Friday night when they tucked her into bed, and was found to have vanished when a family member entered her room the next morning to awaken her, police said. ...
</p>
<br clear="all"/>
</description>
он отображается пустым, когда я извлекаю данные. Я вставляю весь свой код ниже..
Я получаю Rss по этому URL-адресу: http://in.news.yahoo.com/rss/crime
RSSActivity.java
package com.satyampv.dsta;
import java.util.ArrayList;
import java.util.HashMap;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import android.app.ListActivity;
import android.os.Bundle;
import android.text.util.Linkify;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.SimpleAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class AstroRssActivity extends ListActivity {
/** Called when the activity is first created. */
//static final String URL = "http://findyourfate.com/rss/dailyhoroscope-feed.asp?sign=Taurus";
//static final String URL = "http://my.horoscope.com/astrology/daily-horoscopes-rss.html";
static final String URL = "http://in.news.yahoo.com/rss/crime";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_TITLE = "title";
static final String KEY_DESC = "description";
static final String KEY_LINK = "link";
@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.getDocumentElement(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_TITLE, parser.getValue(e, KEY_TITLE));
map.put(KEY_DESC, parser.getValue(e, KEY_DESC));
map.put(KEY_LINK,parser.getValue(e, KEY_LINK));
// adding HashList to ArrayList
menuItems.add(map);
}
// Adding menuItems to ListView
ListAdapter adapter = new SimpleAdapter(this, menuItems,
R.layout.list_item,
new String[] { KEY_TITLE, KEY_DESC, KEY_LINK }, new int[] {
R.id.name, R.id.desciption, R.id.link });
setListAdapter(adapter);
XMLParser.java
package com.satyampv.dsta;
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.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import android.util.Log;
public class XMLParser {
public XMLParser() {
}
public String getXMLFromURL(String url) {
String xml = null;
try {
// Default HTTP Client
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 getDocumentElement(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;
}
public String getValue(Element item,String str){
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
// Getting node Value
// @params ele 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 "";
}
}
