我正在使用一个XmlPullParserFactory对象来解析XML我从服务器收到的一些内容。出于某种原因，它在while声明中崩溃了，我无法弄清楚为什么会发生这种情况。
XML:
<?xml version="1.0" encoding="UTF-8"?>
<body>
<item>
<id>115240</id>
<title>
<![CDATA[Student Evangelism Team Leaves for Fiji]]>
</title>
<created>20130821-15:50</created>
<author>
<![CDATA[Staff Writer]]>
</author>
<summary>
<![CDATA[On August 21, Service, Justice, and Missions Coordinator Fabio Maia and ten
Pacific Union College students left for an eighteen-day evangelism mission in
Fiji with ShareHim and Quiet Hour Ministries.]]>
</summary>
<body_text>
<![CDATA[<p>On August 21, Service, Justice, and Missions Coordinator
Fabio Maia and ten Pacific Union College students left for an eighteen-day
evangelism mission in Fiji with ShareHim and Quiet Hour Ministries. Each
student will be placed in a specific community where they will present the
story of Christ’s love and sacrifice each evening. Many of the students are
active in the college’s praise and worship teams and brought their instruments
so they can share God’s love through music.</p>
<p>Before the group departed, the students gathered in
President Heather J. Knight’s office for a special blessing prayer led by
Pastor Mark Witas, the lead pastor of the PUC Church. Pastor Witas included
special prayer that God lead the group in doing good in His name. <a></a>The group also
bonded by sharing a meal together before heading to the airport for their
flight to Fiji.</p>
<p>For many PUC students, summer is the perfect opportunity to
devote time to ministry and service. While some students work at summer camps
or serve as literature evangelists, other groups get the experience of a
lifetime by sharing the gospel and serving local communities in places around
the world. The PUC community is invited to join in prayer for the team travelling
to Fiji as well as other student groups currently on short-term mission trips
to Nicaragua and Brazil.</p>]]>
</body_text>
<url>http://www.puc.edu/news/archives/2013/student-evangelism-team-leaves-for-fiji</url>
<images>
<image url="http://www.puc.edu/__data/assets/image/0014/115241/fiji.jpg" url_2x="http://www.puc.edu/__data/assets/image/0014/115241/varieties/2x.jpg" thumb_small="http://www.puc.edu/__data/assets/image/0014/115241/varieties/thumb.jpg" thumb_medium="http://www.puc.edu/__data/assets/image/0014/115241/varieties/thumb_large.jpg" thumb_large="http://www.puc.edu/__data/assets/image/0014/115241/varieties/thumb_large.jpg" />
</images>
</item>
... lots more item nodes
</body>
爪哇：
class PUCNewsItem
{
public String title;
public String summary;
public String body;
public String url;
public String imageUrl;
}
public class PUCDatasource extends Activity {
public static ArrayList<PUCNewsItem> getPUCNews() throws IOException {
String url = "http://api.mysite.com/list";
InputStream is = downloadUrl(url);
XmlPullParserFactory pullParserFactory;
try {
pullParserFactory = XmlPullParserFactory.newInstance();
XmlPullParser parser = pullParserFactory.newPullParser();
parser.setInput(is, null);
ArrayList<PUCNewsItem> items = null;
int eventType = parser.getEventType();
PUCNewsItem item = null;
Log.d("Debug: ", "Start");
while (eventType != XmlPullParser.END_DOCUMENT){
String name = null;
switch (eventType){
case XmlPullParser.START_DOCUMENT:
Log.d("Debug: ", "Start doc");
items = new ArrayList<PUCNewsItem>();
break;
case XmlPullParser.START_TAG:
name = parser.getName();
if (name == "item"){
item = new PUCNewsItem();
} else if (item != null){
if (name == "title"){
item.title = parser.nextText();
} else if (name == "summary"){
item.summary = parser.nextText();
} else if (name == "body_text"){
item.body = parser.nextText();
}
}
break;
case XmlPullParser.END_TAG:
name = parser.getName();
if (name.equalsIgnoreCase("item") && item != null) {
items.add(item);
}
break;
}//end switch
eventType = parser.next();
}//end while
return items;
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}//end
}//end class
错误：
09-03 16:31:50.100: W/System.err(16727): Invalid stream or encoding: java.io.IOException: Stream is closed (position:START_DOCUMENT null@1:1) caused by: java.io.IOException: Stream is closed; nested exception is:
09-03 16:31:50.108: W/System.err(16727): java.io.IOException: Stream is closed
09-03 16:31:50.108: W/System.err(16727): at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:158)
09-03 16:31:50.108: W/System.err(16727): at libcore.io.Streams.readSingleByte(Streams.java:41)
09-03 16:31:50.108: W/System.err(16727): at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:128)
09-03 16:31:50.108: W/System.err(16727): at org.kxml2.io.KXmlParser.setInput(KXmlParser.java:1623)
09-03 16:31:50.108: W/System.err(16727): at com.puc.mobile.PUCDatasource.getPUCNews(PUCDatasource.java:40)
09-03 16:31:50.108: W/System.err(16727): at com.puc.mobile.MainActivity$DownloadPUCNews.doInBackground(MainActivity.java:94)
09-03 16:31:50.108: W/System.err(16727): at com.puc.mobile.MainActivity$DownloadPUCNews.doInBackground(MainActivity.java:1)
09-03 16:31:50.108: W/System.err(16727): at android.os.AsyncTask$2.call(AsyncTask.java:264)
09-03 16:31:50.108: W/System.err(16727): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-03 16:31:50.108: W/System.err(16727): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-03 16:31:50.108: W/System.err(16727): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
09-03 16:31:50.108: W/System.err(16727): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
09-03 16:31:50.108: W/System.err(16727): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
09-03 16:31:50.108: W/System.err(16727): at java.lang.Thread.run(Thread.java:856)
09-03 16:31:50.108: D/AndroidRuntime(16727): Shutting down VM
09-03 16:31:50.108: W/dalvikvm(16727): threadid=1: thread exiting with uncaught exception (group=0x40aba210)
09-03 16:31:50.108: E/AndroidRuntime(16727): FATAL EXCEPTION: main
09-03 16:31:50.108: E/AndroidRuntime(16727): java.lang.NullPointerException
09-03 16:31:50.108: E/AndroidRuntime(16727): at com.puc.mobile.MainActivity$DownloadPUCNews.onPostExecute(MainActivity.java:103)
09-03 16:31:50.108: E/AndroidRuntime(16727): at com.puc.mobile.MainActivity$DownloadPUCNews.onPostExecute(MainActivity.java:1)
09-03 16:31:50.108: E/AndroidRuntime(16727): at android.os.AsyncTask.finish(AsyncTask.java:602)
09-03 16:31:50.108: E/AndroidRuntime(16727): at android.os.AsyncTask.access$600(AsyncTask.java:156)
09-03 16:31:50.108: E/AndroidRuntime(16727): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
09-03 16:31:50.108: E/AndroidRuntime(16727): at android.os.Handler.dispatchMessage(Handler.java:99)
09-03 16:31:50.108: E/AndroidRuntime(16727): at android.os.Looper.loop(Looper.java:137)
09-03 16:31:50.108: E/AndroidRuntime(16727): at android.app.ActivityThread.main(ActivityThread.java:4697)
09-03 16:31:50.108: E/AndroidRuntime(16727): at java.lang.reflect.Method.invokeNative(Native Method)
09-03 16:31:50.108: E/AndroidRuntime(16727): at java.lang.reflect.Method.invoke(Method.java:511)
09-03 16:31:50.108: E/AndroidRuntime(16727): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
09-03 16:31:50.108: E/AndroidRuntime(16727): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
09-03 16:31:50.108: E/AndroidRuntime(16727): at dalvik.system.NativeStart.main(Native Method)
关于为什么会发生崩溃的任何想法？我应该以某种方式指定我的根节点的名称吗？