如何通过url获取xml（AsyncTask，android）？
我有以下课程：如何通过url获取xml（AsyncTask，android）？,android,android-asynctask,Android,Android Asynctask,我有以下课程： public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); XmlManager xm = new XmlMa
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
XmlManager xm = new XmlManager();
Log.i("tag",documentToString(xm.getXmlFromUrl("http://domen.com/abc/timelist.xml")));
}
//................
}
public class XmlManager {
public Document getXmlFromUrl(String url) {
GetXmlTask txt = new GetXmlTask();
txt.execute(url);
Document doc = null;
try {
doc = txt.get(5, TimeUnit.SECONDS);
Log.i("tag", "test");
}
catch (Exception e) {
e.printStackTrace();
}
return doc;
}
//................
}
public class GetXmlTask extends AsyncTask<String, Void, org.w3c.dom.Document> {
@Override
protected Document doInBackground(String... arg0) {
String url = "";
if( arg0.length > 0 ){
url = arg0[0];
}
Document doc = null;
try {
doc = stringToDom(convertStreamToString(new URL(url).openStream()));
}
catch (Exception e) {
e.printStackTrace();
}
return doc;
}
//................
}
公共类MainActivity扩展活动{
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
XmlManager xm=新的XmlManager（）；
Log.i（“标记”），documentToString（xm.getXmlFromUrl（“http://domen.com/abc/timelist.xml")));
}
//................
}
公共类XmlManager{
公共文档getXmlFromUrl（字符串url）{
GetXmlTask txt=新建GetXmlTask（）；
txt.execute（url）；
单据单据=空；
试一试{
doc=txt.get（5，时间单位为秒）；
Log.i（“标签”、“测试”）；
}
捕获（例外e）{
e、 printStackTrace（）；
}
退货单；
}
//................
}
公共类GetXmlTask扩展了AsyncTask{
@凌驾
受保护文档doInBackground（字符串…arg0）{
字符串url=“”；
如果（arg0.length>0）{
url=arg0[0]；
}
单据单据=空；
试一试{
doc=stringToDom（convertStreamToString（新URL.openStream（））；
}
捕获（例外e）{
e、 printStackTrace（）；
}
退货单；
}
//................
}
似乎没有正确解析XML文件以在应用程序中使用。解决这个问题的一个可能的解决方案是创建一个适当的XML解析器，然后使用它在文件中的所有节点上循环
........
private class LoadExampleTask extends
AsyncTask<Void, Integer, ArrayList<HashMap<String, String>>> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// code here
}
@Override
protected ArrayList<HashMap<String, String>> doInBackground(
Void... params) {
XMLParser parser = new XMLParser(); // the parser create as seen in the Gist from GitHub
String xml = parser.getXmlFromUrl(URL); // getting XML from URL
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_VENUE);
// looping through all song nodes <venue>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
map.put(KEY_DESCRIPTION, parser.getValue(e, KEY_DESCRIPTION));
map.put(KEY_LOCATION, parser.getValue(e, KEY_LOCATION.toString()));
map.put(KEY_TAGS, parser.getValue(e, KEY_TAGS.toString()));
map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));
map.put(KEY_THUMB_LARGE_URL, parser.getValue(e, KEY_THUMB_LARGE_URL));
// adding HashList to ArrayList
exampleList.add(map);
}
return exampleList;
}
@Override
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
super.onPostExecute(result);
try {
// Getting adapter by passing xml data ArrayList
adapter = new YourExampleAdapter(getActivity(), exampleList);
list.setAdapter(adapter);
adapter.notifyDataSetChanged();
} catch (NullPointerException e) {
e.printStackTrace();
}
}
}
........
<venues>
<venue>
<id></id>
<title></title>
<location></location>
<tags></tags>
<description></description>
<thumb_url></thumb_url>
<thumb_large_url></thumb_large_url>
</venue>
</venues>