我有一个位于
的xml文件http://androtrends.hostingsiteforfree.com/direct.xml
我正在尝试解析这个xml文件，以便在我的程序中使用它，但每次程序强制关闭虽然它没有错误。我是java新手，请帮忙！
以下是我在XMLParser.java中使用的代码
public class XMLParser {
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;
}
//Parsing XML content and getting DOM element
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 DOM
return doc;
}
//Getting each xml child element value by passing element node name
public String getValue(Element item, String str) {
NodeList n = ((Document) item).getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
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 "";
}
}
Channel.java 的代码是
public class Channel extends ListActivity{
String selectedmode, channelName, channelLink;
Intent urlIntent;
// All static variables
static final String DirectURL = "http://androtrends.hostingsiteforfree.com/direct.xml";
static final String FlashURL="http://androtrends.hostingsiteforfree.com/direct.xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_Channel = "channel";
static final String KEY_Link = "link";
String xml;
Toast toast;
ArrayList<HashMap<String, String>> menuItems;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.channels);
selectedmode=getIntent().getExtras().getString("key");
urlIntent=new Intent(Intent.ACTION_VIEW);
Toast.makeText(this, "Wait 60 secs to load the stream...", Toast.LENGTH_LONG).show();
updatechannels();
ListView lv=getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
channelName= ((TextView) view.findViewById(R.id.channelName)).getText().toString();
channelLink= ((TextView) view.findViewById(R.id.channelLink)).getText().toString();
urlIntent.setData(Uri.parse(channelLink));
toast.show();
startActivity(urlIntent);
}
});
}
private void updatechannels() {
// TODO Auto-generated method stub
menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
if (selectedmode.equalsIgnoreCase("direct"))
{
xml = parser.getXmlFromUrl(DirectURL); // getting XML
}else
{
xml = parser.getXmlFromUrl(FlashURL);
}
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_Channel, parser.getValue(e, KEY_Channel));
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_Channel, KEY_Link }, new int[] {
R.id.channelName, R.id.channelLink });
setListAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
答案 0 :(得分：0)
试试这个..
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
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.InputSource;
import org.xml.sax.SAXException;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class NetActivity extends Activity {
String url = "http://androtrends.hostingsiteforfree.com/direct.xml";
// Progress dialog
ProgressDialog pDialog;
ArrayList<String> title;
ArrayList<String> description;
ItemAdapter adapter1;
ListView list;
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_net);
list = (ListView) findViewById(R.id.list);
title = new ArrayList<String>();
description = new ArrayList<String>();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
new XmlParsing(url).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new String[]{null});
else
new XmlParsing(url).execute(new String[]{null});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public class XmlParsing extends AsyncTask<String, Void, String> {
// variables passed in:
String urls;
// constructor
public XmlParsing(String urls) {
this.urls = urls;
}
@Override
protected void onPreExecute() {
pDialog = ProgressDialog.show(NetActivity.this, "Fetching Details..", "Please wait...", true);
}
@Override
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
URL url;
try {
url = new URL(urls);
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(url.openStream()));
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("item");
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
Element fstElmnt = (Element) node;
NodeList nameList = fstElmnt.getElementsByTagName("channel");
Element nameElement = (Element) nameList.item(0);
nameList = nameElement.getChildNodes();
title.add(""+ ((Node) nameList.item(0)).getNodeValue());
System.out.println("channel : "+((Node) nameList.item(0)).getNodeValue());
Element fstElmnt1 = (Element) node;
NodeList nameList1 = fstElmnt1.getElementsByTagName("link");
Element nameElement1 = (Element) nameList1.item(0);
nameList1 = nameElement1.getChildNodes();
description.add(""+ ((Node) nameList1.item(0)).getNodeValue());
System.out.println("link : "+ ((Node) nameList1.item(0)).getNodeValue());
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// Now we have your JSONObject, play around with it.
if (pDialog.isShowing())
pDialog.dismiss();
String value = result;
// Log.v("URL Res- - - -", ""+value);
adapter1 = new ItemAdapter(this);
list.setAdapter(adapter1);
}
}
class ItemAdapter extends BaseAdapter {
final LayoutInflater mInflater;
private class ViewHolder {
public TextView title_text;
public TextView des_text;
}
public ItemAdapter(XmlParsing xmlParsing) {
// TODO Auto-generated constructor stub
super();
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
//@Override
public int getCount() {
return title.size();
}
//@Override
public Object getItem(int position) {
return position;
}
//@Override
public long getItemId(int position) {
return position;
}
//@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
final ViewHolder holder;
if (convertView == null) {
view = mInflater.inflate(R.layout.mainpage_listitem_activity, parent, false);
holder = new ViewHolder();
holder.title_text = (TextView) view.findViewById(R.id.title_text);
holder.des_text = (TextView) view.findViewById(R.id.des_text);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.title_text.setText(""+title.get(position));
holder.des_text.setText(""+description.get(position));
return view;
}
}
}