我正在尝试为我的博客制作一个 RSSReader。我做了一个自己的处理程序。但是当我尝试解析它时它不起作用
这是我的处理程序
import java.util.jar.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import android.util.Log;
public class myHandler extends DefaultHandler {
final private String ENTRY = new String("entry");
final private String TITLE = new String("title");
final private String LINK = new String("link");
final private String LINK_ATTR_HREF = new String("href");
private boolean entryBoolean;
private boolean titleBoolean;
private String contentTitle;
private Content myContent;
public myHandler(Content content) {
myContent = content;
}
@Override
public void startDocument() throws SAXException {
entryBoolean = false;
titleBoolean = false;
contentTitle = "";
}
@Override
public void endDocument() throws SAXException {
}
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
if (localName.equalsIgnoreCase(this.ENTRY)) {
this.entryBoolean = true;
}
else if (localName.equalsIgnoreCase(this.TITLE)) {
this.titleBoolean = true;
}
else if (localName.equalsIgnoreCase(this.LINK)) {
if (entryBoolean) {
Log.i(myHandler.class.getSimpleName(), atts.getValue(this.LINK_ATTR_HREF));
myContent.setUrl(atts.getValue(this.LINK_ATTR_HREF));
}
}
}
@Override
public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
if (localName.equalsIgnoreCase(this.ENTRY)) {
this.entryBoolean = false;
}
else if (localName.equalsIgnoreCase(this.TITLE)) {
this.titleBoolean = false;
if (this.entryBoolean) {
Log.i(myHandler.class.getSimpleName(), this.contentTitle);
myContent.setTitel(this.contentTitle);
this.contentTitle = "";
}
}
}
@Override
public void characters(char ch[], int start, int length) throws SAXException {
String textBetween = new String(ch, start, length);
if (this.entryBoolean) {
// nur Title innerhalb des Entry Element werden ausgelesen
if (this.titleBoolean) {
this.contentTitle = this.contentTitle + textBetween;
}
}
}
}
@Override
public void endElement(String namespaceURI, String localName, String qName)throws SAXException {
if(localName.equalsIgnoreCase(this.ENTRY)){
this.entryBoolean = false;
}
else if(localName.equalsIgnoreCase(this.TITLE)){
this.titleBoolean = false;
if(this.entryBoolean){
Log.i(myHandler.class.getSimpleName(), this.contentTitle);
myContent.setTitel(this.contentTitle);
this.contentTitle = "";
}
}
}
@Override
public void characters(char ch[], int start, int length)throws SAXException {
String textBetween = new String(ch, start, length);
if(this.entryBoolean){
//nur Title innerhalb des Entry Element werden ausgelesen
if(this.titleBoolean){
this.contentTitle = this.contentTitle + textBetween;
}
}
}}
这是我的 RSSMain.java
import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.xml.sax.SAXException;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class RSSMain extends Activity {
private final String tag = RSSMain.class.getSimpleName();
private final String URL_RSS = "http://www.heise.de/newsticker/heise-top-atom.xml";
private ListView liste;
private static Content myContent;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rssmain);
liste =(ListView)findViewById(R.id.feedListe);
myContent = new Content();
new ReadRssFeedTask(this).execute();
liste.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
Intent intent = new Intent(RSSMain.this,Anzeigen.class);
intent.putExtra("URL", myContent.getUrl(position));
startActivity(intent);
}
});
}
private class ReadRssFeedTask extends AsyncTask<Void,Void,Void> {
private ProgressDialog dialog;
private HttpClient client;
private HttpGet httpGet;
private HttpResponse response;
//Konstruktor
public ReadRssFeedTask(Activity activity) {
client = new DefaultHttpClient();
httpGet = new HttpGet(URL_RSS);
response = null;
dialog = new ProgressDialog(activity);
}
protected void onPreExecute() {
dialog.setTitle("Bitte warten!");
dialog.setMessage("Der RSS Feed wird vom Server geladen.");
dialog.show();
}
@Override
protected Void doInBackground(Void... tmp){
try {
response = client.execute(httpGet);
} catch (ClientProtocolException e) {
Log.e(tag,"Falsches Protokol " + e.getMessage());
} catch (IOException e) {
Log.e(tag,"URL ist falsch, URL: "+URL_RSS + " " + e.getMessage());
}
if(response != null){
StatusLine statusLine = response.getStatusLine();
if ( statusLine.getStatusCode() == 200) {
HttpEntity entity = response.getEntity();
try {
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = null;
try {
sp = spf.newSAXParser();
} catch (ParserConfigurationException e) {
Log.e(tag, "Fehler: " + e.getMessage());
} catch (SAXException e) {
Log.e(tag, "Fehler im Handler: " + e.getMessage());
}
Handler myHandler = new Handler();
try {
sp.parse(entity.getContent(), myHandler);
} catch (SAXException e) {
Log.e(tag,"Fehler beim Parsen. Fehler: " + e.getMessage());
} catch (IOException e) {
Log.e(tag,"URL: "+ URL_RSS + " konnte nicht geöffnet werde! "+ e.getMessage());
}
} catch (IllegalStateException e) {
e.printStackTrace();
}
}else{
Log.i(RSSMain.class.getSimpleName(),"Der Server antwortet mit anderen Statuscode als 200. Statuscode: "+statusLine.getStatusCode());
}
}else{
Log.i(RSSMain.class.getSimpleName(),"Keine Internetverbindung.");
}
return null;
}
@Override
protected void onPostExecute(Void result){
if (dialog.isShowing()) {
dialog.dismiss();
}
liste.setAdapter(new ArrayAdapter<String>(RSSMain.this, android.R.layout.simple_list_item_1,myContent.getTitel()));
}
}
}
为什么解析器不起作用？我找不到答案。
谢谢您的帮助