下面是我从网站教程获得的RSSReader，但它是一个旧教程，并使用旧的SDK版本。所以，我修改它没有任何错误，但当我运行代码时，我无法得到一个feed。你能帮我找到问题吗？它只显示LogCat中的“getfeed问题”。
public class RSSReader extends Activity implements OnItemClickListener{
public final String RSSFEED = "http://www.ibm.com/developerworks/views/rss/customrssatom.jsp?zone_by=XML&zone_by=Java&zone_by=Rational&zone_by=Linux&zone_by=Open+source&zone_by=WebSphere&type_by=Tutorials&search_by=&day=1&month=06&year=2007&max_entries=20&feed_by=rss&isGUI=true&Submit.x=48&Submit.y=14";
public final String tag = "RSSReader";
private RSSFeed feed = null;
private Handler handler = new Handler();
private ProgressDialog dialog;
/** Called when the activity is first created. */
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
dialog = ProgressDialog.show(RSSReader.this, "Loading", "Loading, please wait..");
Thread t = new Thread() {
public void run() {
feed = getFeed(RSSFEED);
handler.post(new Runnable() {
public void run() {
dialog.dismiss();
UpdateDisplay();
};
});
}
};
t.start();
}
private RSSFeed getFeed(String urlToRssFeed){
try{
URL url = new URL(urlToRssFeed);
SAXParserFactory factory = SAXParserFactory.newInstance(); // create the factory
SAXParser parser = factory.newSAXParser(); // create a parser
XMLReader xmlreader = parser.getXMLReader(); // create the reader (scanner)
RSSHandler theRssHandler = new RSSHandler(); // instantiate our handler
xmlreader.setContentHandler(theRssHandler); // assign our handler
InputSource is = new InputSource(url.openStream()); // get our data via the url class
xmlreader.parse(is); // perform the synchronous parse
return theRssHandler.getFeed(); // get the results - should be a fully populated RSSFeed instance, or null on error
}
catch (Exception ee){
Log.i(tag, "getfeed problem");
return null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.addSubMenu(0, 0, 0, "Choose RSS Feed");
menu.addSubMenu(0, 1, 0, "Refresh");
Log.i(tag, "onCreateOptionsMenu");
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()) {
case 0:
Log.i(tag,"Set RSS Feed");
return true;
case 1:
Log.i(tag,"Refreshing RSS Feed");
return true;
}
return false;
}
private void UpdateDisplay(){
TextView feedtitle = (TextView) findViewById(R.id.feedtitle);
TextView feedpubdate = (TextView) findViewById(R.id.feedpubdate);
ListView itemlist = (ListView) findViewById(R.id.itemlist);
if (feed == null){
feedtitle.setText("No RSS Feed Available lo..");
return;
}
feedtitle.setText(feed.getTitle());
feedpubdate.setText(feed.getPubDate());
ArrayAdapter<RSSItem> adapter = new ArrayAdapter<RSSItem>(this,android.R.layout.simple_list_item_1,feed.getAllItems());
itemlist.setAdapter(adapter);
itemlist.setOnItemClickListener(this);
itemlist.setSelection(0);
}
public void onItemClick(AdapterView<?> parent, View v, int position, long id){
Log.i(tag,"item clicked! [" + feed.getItem(position).getTitle() + "]");
Intent itemintent = new Intent(this,ShowDescription.class);
Bundle b = new Bundle();
b.putString("title", feed.getItem(position).getTitle());
b.putString("description", feed.getItem(position).getDescription());
b.putString("link", feed.getItem(position).getLink());
b.putString("pubdate", feed.getItem(position).getPubDate());
itemintent.putExtra("android.intent.extra.INTENT", b);
startActivityForResult (itemintent,0);
}
}
如果您需要整个项目，我会向您展示所有java文件或上传项目文件。
答案 0 :(得分：1)
好吧，我遇到了同样的问题，但我最终解决了这个问题。我假设你有一个RSS解析器，所以这里是活动本身的解决方案。修改此代码：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.feed_layout);
if (haveNetworkConnection()== false) crea_connessione();
itemlist = new ArrayList<RSSItem>();
new RetrieveRSSFeeds().execute();
}
//check internet connection
private void crea_connessione()
{
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("No Internet Connection. Activate Now?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
dialog.cancel();
finish();
}
});
final AlertDialog alert = builder.create();
alert.show();
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
RSSItem data = itemlist.get(position);
Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(data.link));
startActivity(intent);
}
private void retrieveRSSFeed(String urlToRssFeed,ArrayList<RSSItem> list)
{
try
{
URL url = new URL(urlToRssFeed);
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser parser = factory.newSAXParser();
XMLReader xmlreader = parser.getXMLReader();
RSSParser theRssHandler = new RSSParser(list);
xmlreader.setContentHandler(theRssHandler);
InputSource is = new InputSource(url.openStream());
xmlreader.parse(is);
}
catch (Exception e)
{
e.printStackTrace();
}
}
private class RetrieveRSSFeeds extends AsyncTask<Void, Void, Void>
{
private ProgressDialog progress = null;
@Override
protected Void doInBackground(Void... params) {
retrieveRSSFeed("http://blog.qubiz.com/index.php/feed",itemlist);
rssadaptor = new RSSListAdaptor(RSSListActivity.this, R.layout.rssitemview,itemlist);
return null;
}
@Override
protected void onCancelled() {
super.onCancelled();
}
@Override
protected void onPreExecute() {
progress = ProgressDialog.show(
RSSListActivity.this, null, "Loading RSS Feed... Please wait");
super.onPreExecute();
}
@Override
protected void onPostExecute(Void result) {
setListAdapter(rssadaptor);
progress.dismiss();
super.onPostExecute(result);
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
private class RSSListAdaptor extends ArrayAdapter<RSSItem>{
private List<RSSItem> objects = null;
public RSSListAdaptor(Context context, int textviewid, List<RSSItem> objects) {
super(context, textviewid, objects);
this.objects = objects;
}
@Override
public int getCount() {
return ((null != objects) ? objects.size() : 0);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public RSSItem getItem(int position) {
return ((null != objects) ? objects.get(position) : null);
}
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if(null == view)
{
LayoutInflater vi = (LayoutInflater)RSSListActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = vi.inflate(R.layout.rssitemview, null);
}
RSSItem data = objects.get(position);
if(null != data)
{
TextView title = (TextView)view.findViewById(R.id.txtTitle);
TextView date = (TextView)view.findViewById(R.id.txtDate);
TextView description = (TextView)view.findViewById(R.id.txtDescription);
title.setText(data.title);
date.setText("on " + data.date);
String prova = android.text.Html.fromHtml(data.description).toString();
//description.setText(data.description);
description.setText(prova);
}
return view;
}
}
我希望这能帮到你。