似乎是下载文件时候的错误

07-15 01:36:59.221: W/dalvikvm(2073): threadid=11: thread exiting with uncaught exception (group=0x40a71930)
07-15 01:36:59.281: E/AndroidRuntime(2073): FATAL EXCEPTION: AsyncTask #1
07-15 01:36:59.281: E/AndroidRuntime(2073): java.lang.RuntimeException: An error occured while executing doInBackground()
07-15 01:36:59.281: E/AndroidRuntime(2073): at android.os.AsyncTask$3.done(AsyncTask.java:299)
07-15 01:36:59.281: E/AndroidRuntime(2073): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
07-15 01:36:59.281: E/AndroidRuntime(2073): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
07-15 01:36:59.281: E/AndroidRuntime(2073): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
07-15 01:36:59.281: E/AndroidRuntime(2073): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
07-15 01:36:59.281: E/AndroidRuntime(2073): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
07-15 01:36:59.281: E/AndroidRuntime(2073): at java.lang.Thread.run(Thread.java:856)
07-15 01:36:59.281: E/AndroidRuntime(2073): Caused by: java.lang.NullPointerException
07-15 01:36:59.281: E/AndroidRuntime(2073): at com.chris.lr.slidemenu.MainActivity$ProductHandler.endElement(MainActivity.java:281)
07-15 01:36:59.281: E/AndroidRuntime(2073): at org.apache.harmony.xml.ExpatParser.endElement(ExpatParser.java:156)
07-15 01:36:59.281: E/AndroidRuntime(2073): at org.apache.harmony.xml.ExpatParser.appendBytes(Native Method)
07-15 01:36:59.281: E/AndroidRuntime(2073): at org.apache.harmony.xml.ExpatParser.parseFragment(ExpatParser.java:513)
07-15 01:36:59.281: E/AndroidRuntime(2073): at org.apache.harmony.xml.ExpatParser.parseDocument(ExpatParser.java:474)
07-15 01:36:59.281: E/AndroidRuntime(2073): at org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:321)
07-15 01:36:59.281: E/AndroidRuntime(2073): at org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:279)
07-15 01:36:59.281: E/AndroidRuntime(2073): at com.chris.lr.slidemenu.MainActivity$GetHttpTask.doInBackground(MainActivity.java:193)
07-15 01:36:59.281: E/AndroidRuntime(2073): at com.chris.lr.slidemenu.MainActivity$GetHttpTask.doInBackground(MainActivity.java:1)
07-15 01:36:59.281: E/AndroidRuntime(2073): at android.os.AsyncTask$2.call(AsyncTask.java:287)
07-15 01:36:59.281: E/AndroidRuntime(2073): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
07-15 01:36:59.281: E/AndroidRuntime(2073): ... 3 more

相关代码如下，
    void httpGet() {
     GetHttpTask task = new GetHttpTask();
     task.execute("http://www.cnzjmsa.gov.cn/rssweb/rsstzgg/index.xml");
    }

    public class GetHttpTask extends AsyncTask<String, Integer, String> {

     public GetHttpTask() {
        }

     protected void onPreExecute() {

     }

     protected String doInBackground(String... params) {
         HttpGet httpRequest = new HttpGet(params[0]);
         HttpClient httpclient = new DefaultHttpClient();

         //mShowHtml.setText("");
         try {
         HttpResponse httpResponse = httpclient.execute(httpRequest);

         if(httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
         HttpEntity entitiy = httpResponse.getEntity();

         InputStream in = entitiy.getContent();

         InputSource source = new InputSource(in);

         SAXParserFactory sax = SAXParserFactory.newInstance();
         XMLReader xmlReader = sax.newSAXParser().getXMLReader();

         xmlReader.setContentHandler(new ProductHandler());

         xmlReader.parse(source);

         }
         else {
         ;
         }

         }catch(IOException e){
         e.printStackTrace();
         }catch(SAXException e) {
         e.printStackTrace();
         }catch(ParserConfigurationException e) {
         e.printStackTrace();
         }
         return null;
     }

     protected void onPostExecute(String result) {
     }
    }

我昨天还可以运行并且正常解析XML的数据返回到当前LISTVIEW上，为什么今天突然报错呢，程序运行后大约5秒直接退出了 asynctask 异常 --------------------编程问答-------------------- xml解析出错，打log看看从服务器收到内容的是什么? --------------------编程问答-------------------- Caused by: java.lang.NullPointerException
07-15 01:36:59.281: E/AndroidRuntime(2073):  at com.chris.lr.slidemenu.MainActivity$ProductHandler.endElement(MainActivity.java:281)

找到代码看看

补充：移动开发 ,  Android