使用CDATA标记进行XML解析

Question

我有一个来自API的XML，它包含一些要显示的广告。下面是XML样子：

<mojiva> 
<ad type="image"> 
<url> 
<![CDATA[ 
http://google.com 
]]> 
</url> 
<img type="image/png"> 
<![CDATA[ 
http://account.mobfox.com/activation_vad.php 
]]> 
</img> 
<track> 
<![CDATA[ 
http://ads.moceanads.com/2/img/c2d79d40-6182-11e3-8f06-a0369f167751 
]]> 
</track> 
</ad> 
</mojiva> 

在此我两件事情来解析<url>标签和标签<img>用于显示得当我的应用程序中。两个标签内都有一个CDATA的情况。

如何解析只提到的标签没有CDATA获取网址并显示它。 任何形式的帮助将不胜感激。

更新后的代码（使用XMLPullParser）：

public class AdPull { 

private static final String demoURL = null; 

public AdPull(InputStream open) { 
    try { 
     XmlPullParser parser = Xml.newPullParser(); 
     parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false); 
     parser.setInput(open, null); 
     parser.nextTag(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

private List<Entry> readFeed(XmlPullParser parser) 
     throws XmlPullParserException, IOException { 
    List<Entry> entries = new ArrayList<Entry>(); 
    parser.require(XmlPullParser.START_TAG, demoURL, "mojiva"); 
    while (parser.next() != XmlPullParser.END_TAG) { 
     if (parser.getEventType() != XmlPullParser.START_TAG) { 
      continue; 
     } 
     String name = parser.getName(); 
     if (name.equals("ad")) { 
      entries.add(readAd(parser)); 
     } else { 
      skip(parser); 
     } 
    } 
    return entries; 
} 

private Entry readAd(XmlPullParser parser) throws XmlPullParserException, 
     IOException { 
    parser.require(XmlPullParser.START_TAG, demoURL, "ad"); 
    String url = null; 
    String image = null; 
    while (parser.next() != XmlPullParser.END_TAG) { 
     if (parser.getEventType() != XmlPullParser.START_TAG) { 
      continue; 
     } 
     String name = parser.getName(); 
     if (name.equals("url")) { 
      url = readUrl(parser); 
     } else if (name.equals("img")) { 
      image = readImage(parser); 
     } else { 
      skip(parser); 
     } 
    } 
    return new Entry(url, image); 
} 

private String readUrl(XmlPullParser parser) throws IOException, 
     XmlPullParserException { 
    parser.require(XmlPullParser.START_TAG, demoURL, "url"); 
    String url = readText(parser); 
    parser.require(XmlPullParser.END_TAG, demoURL, "url"); 
    return url; 
} 

private String readImage(XmlPullParser parser) throws IOException, 
     XmlPullParserException { 
    parser.require(XmlPullParser.START_TAG, demoURL, "img"); 
    String image = readText(parser); 
    parser.require(XmlPullParser.END_TAG, demoURL, "img"); 
    return image; 
} 

private String readText(XmlPullParser parser) throws IOException, 
     XmlPullParserException { 
    String result = ""; 
    if (parser.next() == XmlPullParser.TEXT) { 
     result = parser.getText(); 
     parser.nextTag(); 
    } 
    return result; 
} 

private void skip(XmlPullParser parser) throws XmlPullParserException, 
     IOException { 
    if (parser.getEventType() != XmlPullParser.START_TAG) { 
     throw new IllegalStateException(); 
    } 
    int depth = 1; 
    while (depth != 0) { 
     switch (parser.next()) { 
     case XmlPullParser.END_TAG: 
      depth--; 
      break; 
     case XmlPullParser.START_TAG: 
      depth++; 
      break; 
     } 
    } 
} 

public static class Entry { 
    public final String adURL; 
    public final String adImage; 

    private Entry(String url, String image) { 
     this.adURL = url; 
     this.adImage = image; 
    } 
} 
} 

这里是我的异步任务，我想打印XML值提要：

class AsyncTaskRunner extends AsyncTask<String, String, String> { 

    @Override 
    protected String doInBackground(String... params) { 

     try { 
      DefaultHttpClient httpclient = new DefaultHttpClient(); 
      HttpGet httppost = new HttpGet(completeURL); 
      HttpResponse response = httpclient.execute(httppost); 
      HttpEntity ht = response.getEntity(); 
      String _respons = EntityUtils.toString(ht); 
      InputStream is = new ByteArrayInputStream(_respons.getBytes()); 
      new AdPull(is); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 
} 

但是，这是给我错误，只要我通过它里面的completeURL The constructor parserPull(String) is undefined

我在做什么错h ERE？

Answer 1

使用XmlPullParser

The constructor parserPull(String) is undefined 

public AdPull(InputStream open)预计为InputStream。你有错误的构造函数参数，名字也是错误的。

在doInbackground

class AsyncTaskRunnerextends AsyncTask<Void ,List<Entry>,List<Entry>>{ 


    @Override 
    protected List<Entry> doInBackground(Void... sUrl) { 
      DefaultHttpClient httpclient = new DefaultHttpClient(); 
        HttpGet httppost = new HttpGet(completeURL); 
        HttpResponse response = httpclient.execute(httppost); 
        HttpEntity ht = response.getEntity(); 
        String _respons = EntityUtils.toString(ht); 
        InputStream is = new ByteArrayInputStream(_respons.getBytes()); 
     AdPull ad =new AdPull(is); //expects a input stream 
     List<Entry> list = ad.getData(); 

     return list; 

    } 

    @Override 
    protected void onPostExecute(List<Entry> result) { 
     // TODO Auto-generated method stub 
     super.onPostExecute(result); 
    } 

} 

有以下单独的java文件

public class Entry { 
    public final String adURL; 
    public final String adImage; 

    Entry(String url, String image) { 
     this.adURL = url; 
     this.adImage = image; 
    } 
} 

你不AdPull

调用readFeed(XmlPullParser parser)在AdPull做如下修改

private static final String ns = null; 
List<Entry> all; 
InputStream is; 
public AdPull(InputStream open) { 
    is =open; 
} 
public List<Entry> getData() 
{ 
try 
    { 
    XmlPullParser parser = Xml.newPullParser(); 
     parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false); 
     parser.setInput(is, null); 
     parser.nextTag(); 
     all = readFeed(parser); 

    }catch(Exception e) 
    { 
     e.printStackTrace(); 
    } 
return all; 
}