我正在尝试提取可以在此处看到的 XML 文件：
http://feeds.pcworld.com/pcworld/latestnews
这是我的MainActivity
public class MainActivity extends ListActivity {
ArrayAdapter<Item> adapter;
List<Item>items;//Holds item objects containing info relating to element pulled from XML file.
Item item;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initialize variables
items = new ArrayList<Item>();
new PostTask().execute();
adapter= new ArrayAdapter<Item>(this, android.R.layout.simple_list_item_1, items);
setListAdapter(adapter);
}
private InputStream getInputStream(URL url) {
try{
return url.openConnection().getInputStream();
}catch(IOException e){
return null;
}
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Uri uri = items.get(position).getLink();
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
//ASYNC CLASS
private class PostTask extends AsyncTask<String, Integer, String>{
@Override
protected String doInBackground(String... arg0) {
try{
//link to data source
URL url = new URL("http://feeds.pcworld.com/pcworld/latestnews");
//Set up parser
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(false);
XmlPullParser xpp = factory.newPullParser();
//get XML from input stream
xpp.setInput(getInputStream(url), "UTF_8");
//Keep track of which tag inside of XML
boolean insideItem = false;
//Loop through the XML file and extract data required
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_TAG) {
Log.v("ENTER", String.valueOf(xpp.getEventType()));
if (xpp.getName().equalsIgnoreCase("item")) {
insideItem = true;
//Create new item object
item = new Item();
} else if (xpp.getName().equalsIgnoreCase("title")) {
if (insideItem){
item.setTitle(xpp.nextText());
}
}
else if (xpp.getName().equalsIgnoreCase("description")) {
if (insideItem){
item.setDescription(xpp.nextText());
}
}
else if (xpp.getName().equalsIgnoreCase("link")) {
if (insideItem){
item.setLink(Uri.parse(xpp.nextText()));
}
}
}else if(eventType==XmlPullParser.END_TAG && xpp.getName().equalsIgnoreCase("item")){
insideItem=false;
//add item to list
items.add(item);
}
eventType = xpp.next(); //move to next element
publishProgress();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return "COMPETED";
}
@Override
protected void onProgressUpdate(Integer... values) {
adapter.notifyDataSetChanged();
}
public void onPostExecute(String s) {
Toast.makeText(getApplicationContext(), s + " Items: " + items.size(), Toast.LENGTH_SHORT).show();
adapter.notifyDataSetChanged();
}
}
}
这是Item课
public class Item {
//Variables
private String title;
private Uri link;
private String description;
public Item() {
super();
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Uri getLink() {
return link;
}
public void setLink(Uri link) {
this.link = link;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
但是，当我运行我的应用程序时出现此错误
原因：com.example.simplerss.MainActivity$PostTask.doInBackground(MainActivity.java:86) 的 com.example.simplerss 的 org.kxml2.io.KXmlParser.setInput(KXmlParser.java:1615) 的 java.lang.IllegalArgumentException .MainActivity$PostTask.doInBackground(MainActivity.java:1) at android.os.AsyncTask$2.call(AsyncTask.java:287) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
这是堆栈跟踪：
03-06 15:06:08.095: E/AndroidRuntime(670): FATAL EXCEPTION: AsyncTask #1
03-06 15:06:08.095: E/AndroidRuntime(670): java.lang.RuntimeException: An error occured while executing doInBackground()
03-06 15:06:08.095: E/AndroidRuntime(670): at android.os.AsyncTask$3.done(AsyncTask.java:299)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-06 15:06:08.095: E/AndroidRuntime(670): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.lang.Thread.run(Thread.java:856)
03-06 15:06:08.095: E/AndroidRuntime(670): Caused by: java.lang.IllegalArgumentException
03-06 15:06:08.095: E/AndroidRuntime(670): at org.kxml2.io.KXmlParser.setInput(KXmlParser.java:1615)
03-06 15:06:08.095: E/AndroidRuntime(670): at com.example.simplerss.MainActivity$PostTask.doInBackground(MainActivity.java:86)
03-06 15:06:08.095: E/AndroidRuntime(670): at com.example.simplerss.MainActivity$PostTask.doInBackground(MainActivity.java:1)
03-06 15:06:08.095: E/AndroidRuntime(670): at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-06 15:06:08.095: E/AndroidRuntime(670): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-06 15:06:08.095: E/AndroidRuntime(670): ... 5 more
任何帮助深表感谢。