SAXParser如何无法打开网址？

Question

http://fig.nowsprouting.com/citychurchofolivebranch/podcast.php?pageID=6 

这是我试图解析和显示每个项目的标题的网址。

不幸的是，我不断收到此错误

05-28 22:56:08.761 27744-27744/com.tubbs.citychurchob E/SELinux﹕ [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL 

05-28 23:06:22.801 1927-1927/com.tubbs.citychurchob E/Podcast Fragment Class﹕ Couldn't open http://fig.nowsprouting.com/citychurchofolivebranch/podcast.php?pageID=6 

这里是所有相关代码：

播客片段类：

public class PodcastFragment extends Fragment { 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    View v = inflater.inflate(R.layout.podcast_fragment,container,false); 

    try { 
     RssReader rssReader = new RssReader("http://fig.nowsprouting.com/citychurchofolivebranch/podcast.php?pageID=6"); 

     ListView podcastItems = (ListView)v.findViewById(R.id.podcast_list); 

     ArrayAdapter<PodcastItem> adapter = new ArrayAdapter<PodcastItem>(getActivity(),android.R.layout.simple_list_item_1,rssReader.getItems()); 

     podcastItems.setAdapter(adapter); 
    }catch (Exception e){ 
     Log.e("Podcast Fragment Class",e.getMessage()); 
    } 
    return v; 
} 
} 

RssReader类：

public class RssReader { 

private String rssFeedUrl; 


public RssReader(String rssFeedUrl){ 
    this.rssFeedUrl = rssFeedUrl; 
} 


public List<PodcastItem> getItems() throws Exception{ 

    SAXParserFactory factory = SAXParserFactory.newInstance(); 
    SAXParser saxParser = factory.newSAXParser(); 

    RssParseHandler handler = new RssParseHandler(); 

    saxParser.parse(rssFeedUrl,handler); 

    return handler.getRssItems(); 


} 
} 

RssParseHandler类：

public class RssParseHandler extends DefaultHandler { 


private List<PodcastItem> rssItems; 

//Used to reference item while parsing 
private PodcastItem currentItem; 

//Parsing title indicator 
private boolean parsingTitle; 


public RssParseHandler(){ 
    rssItems = new ArrayList<PodcastItem>(); 

} 

public List<PodcastItem> getRssItems(){ 
    return rssItems; 
} 

//Basically what this is doing is processing the entire <item> tag(at the start of it) of a particular Rss Feed List. 
//It then checks to see if this is truly the start of the <item> tag or the first one 
//If it is then it instantiates a New Podcast Item object 
//Then it goes further through the list and once it finds <title>, it sets the boolean "parsingTitle" to true 
//since it has come across that particular tag 

@Override 
public void startElement(String uri, String localName, String elementName, Attributes attributes) throws SAXException { 
    if("item".equals(elementName)){ 
     currentItem = new PodcastItem(); 
    } else if ("title".equals(elementName)) { 
     parsingTitle = true; 
    } 
} 

//Essentialy what this is doing is looking for the end <item> tag, once it has reached it, it will add 
//the current PodcastItem Object to the list of "rssItems" since there is no more elements to go through. 
//Then it sets the PodcastItem Object to null to start fresh at the next <item> tags. 
//It then resets "parsingTitle" to false to once again start fresh at the next <item> tags. 

@Override 
public void endElement(String uri, String localName, String elementName) throws SAXException { 
    if("item".equals(elementName)){ 
     rssItems.add(currentItem); 
     currentItem = null; 
    }else if ("title".equals(elementName)){ 
     parsingTitle = false; 
    } 
} 


//This method checks to see whether "parsingTitle" is true or false. If it is true then it will set 
// "currentItem"'s title to whatever was passed into the method. Not sure how this method works.....yet. 
//YOU GOT THIS TIM 

@Override 
public void characters(char[] ch, int start, int length) throws SAXException { 
    if(parsingTitle){ 
     if(currentItem != null){ 
      currentItem.setmPodcastTitle(new String(ch,start,length)); 
     } 
    } 
} 


} 

我还加入了Internet权限标签。

我对XML解析相当陌生，所以我有点不知所措。 任何帮助将是伟大的，谢谢！

Answer 1

解决了它。

对于任何遇到此问题的人，显然Android会阻止您在主线程上拨打网络电话。

的sooo，你必须使用解析一个单独的线程的URL的AsyncTask像这样：

public class PodcastFragment extends Fragment { 

private View v; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    v = inflater.inflate(R.layout.podcast_fragment, container, false); 

    GetRSSDataTask task = new GetRSSDataTask(); 
    task.execute("http://fig.nowsprouting.com/citychurchofolivebranch/podcast.php?pageID=6"); 

    //RssReader rssReader = new RssReader("http://fig.nowsprouting.com/citychurchofolivebranch/podcast.php?pageID=6"); 


    return v; 
} 


private class GetRSSDataTask extends AsyncTask<String, Void, List<PodcastItem>> { 
    @Override 
    protected List<PodcastItem> doInBackground(String... url) { 

     try { 
      //Instantiate a RSS Reader object 
      RssReader rssReader = new RssReader(url[0]); 

      //Parse the Rss Feed and get the items returned 
      return rssReader.getItems(); 

     } catch (Exception e) { 
      Log.e("Podcast Fragment Class", e.getMessage()); 
     } 
     return null; 
    } 

    @Override 
    protected void onPostExecute(List<PodcastItem> result) { 
     //Get a ListView from main view 
     ListView podcastItems = (ListView) v.findViewById(R.id.podcast_list); 

     //Create a List Adapter 
     ArrayAdapter<PodcastItem> adapter = new ArrayAdapter<PodcastItem>(getActivity(), android.R.layout.simple_list_item_1, result); 

     //Attach Adapter to List 
     podcastItems.setAdapter(adapter); 
    } 
} 
}