所以我设置了这个解析代码，我得到了 NetworkOnMainThreadException，所以我想把它包装在一个 AsyncTask 中，但我不知道该放什么以及放哪里..
我已经阅读了一些关于 AsyncTask 的教程，但它们都有些令人困惑，我想知道是否有人能指出我应该将我现在拥有的块放在哪里：
Noticias.java (MainActivity):
public class Noticias extends ListActivity {
static final String URL = "http://loc.grupolusofona.pt/index.php/?format=feed";
static final String KEY_ITEM = "item";
static final String KEY_TITLE = "title";
static final String KEY_DESC = "description";
static final String KEY_LINK = "link";
static final String KEY_PUBDATE = "pubDate";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_noticias);
ArrayList<HashMap<String, Spanned>> menuItems = new ArrayList<HashMap<String, Spanned>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL);
Document doc = parser.getDomElement(xml);
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
String data[] = new String[nl.getLength()];
for (int i = 0; i < nl.getLength(); i++) {
HashMap<String, Spanned> map = new HashMap<String, Spanned>();
Element e = (Element) nl.item(i);
//Date Conversion
data[i] = getTagValue("pubDate", e);
SimpleDateFormat sdf = new SimpleDateFormat("EE, dd MMM yyyy HH:mm:ss z", Locale.UK);
Date date = null;
try {
date = sdf.parse(data[i]);
String timeOfDay = new SimpleDateFormat("HH:mm").format(date);
java.sql.Timestamp timeStampDate = new Timestamp(date.getTime());
java.sql.Timestamp timeStampNow = new Timestamp((new java.util.Date()).getTime());
long secondDiff = timeStampNow.getTime() / 1000 - timeStampDate.getTime() / 1000;
int minuteDiff = (int) (secondDiff / 60);
int hourDiff = (int) (secondDiff / 3600);
int dayDiff = daysBetween(date, new Date());
if (dayDiff > 0) {
System.out.println("Há " + dayDiff + " dia(s), às " + timeOfDay);
data[i] = ("Há " + dayDiff + " dia(s), às " + timeOfDay);
} else if (hourDiff > 0) {
System.out.println("Há " + hourDiff + " hora(s), às " + timeOfDay);
data[i] = ("Há " + hourDiff + " hora(s), às " + timeOfDay);
} else if (minuteDiff > 0) {
System.out.println("Há " + minuteDiff + " minuto(s), às " + timeOfDay);
data[i] = ("Há " + minuteDiff + " minuto(s), às " + timeOfDay);
} else if (secondDiff > 0) {
System.out.println("Há " + secondDiff + " segundo(s), às " + timeOfDay);
data[i] = ("Há " + secondDiff + " segundo(s), às " + timeOfDay);
}
} catch (ParseException e1) {
e1.printStackTrace();
} catch (java.text.ParseException e1) {
e1.printStackTrace();
}
//Html.fromHtml to get <CDATA> Description
map.put(KEY_TITLE, Html.fromHtml(parser.getValue(e, KEY_TITLE)));
map.put(KEY_DESC, Html.fromHtml(parser.getValue(e, KEY_DESC)));
map.put(KEY_PUBDATE, Html.fromHtml(data[i]));
map.put(KEY_LINK, Html.fromHtml(parser.getValue(e, KEY_LINK)));
menuItems.add(map);
} //endFOR
//Using ListAdapter is enough for this, no need for Custom Adapter
ListAdapter adapter = new SimpleAdapter(this, menuItems, R.layout.linhafeed,
new String[] { KEY_TITLE, KEY_DESC, KEY_PUBDATE, KEY_LINK },
new int[] { R.id.title, R.id.desc, R.id.pub, R.id.link });
setListAdapter(adapter);
ListView lv = getListView();
//Opening Link onClick
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String link = ((TextView) view.findViewById(R.id.link)).getText().toString();
System.out.println("Link: " + link);
Intent in = new Intent(Intent.ACTION_VIEW);
in.setData(Uri.parse(link));
startActivity(in);
}
});
}
private static String getTagValue(String sTag, Element e) {
NodeList nlList = e.getElementsByTagName(sTag).item(0).getChildNodes();
Node nValue = (Node) nlList.item(0);
return nValue.getNodeValue();
}
public static int daysBetween(Date startDate, Date endDate) {
int daysBetween = 0;
while (startDate.before(endDate)) {
startDate.setTime(startDate.getTime() + 86400000);
daysBetween++;
}
return daysBetween;
}
}
和 XMLParser.java：
public class XMLParser {
// constructor
public XMLParser() {
}
/**
* Getting XML from URL making HTTP request
* @param url string
* */
public String getXmlFromUrl(String url) {
String xml = null;
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}
/**
* Getting XML DOM element
* @param XML string
* */
public Document getDomElement(String xml){
Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);
} catch (ParserConfigurationException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (SAXException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (IOException e) {
Log.e("Error: ", e.getMessage());
return null;
}
return doc;
}
/** Getting node value
* @param elem element
*/
public final String getElementValue( Node elem ) {
if( elem != null){
return elem.getTextContent();
}
return "";
}
/**
* Getting node value
* @param Element node
* @param key string
* */
public String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
}
谢谢你的时间。