我正在尝试做这个教程： http: //www.newthinktank.com/2013/05/android-development-tutorial-8/
出于某种原因，它似乎在 int responseCode = httpConnection.getResponseCode(); 上失败了。
所有以前的调试消息都在工作。我不太了解如何使用 logcat 错误，所以如果您需要更多 logcat 信息，请告诉我要查找的内容，我会回复。
private class MyAsyncTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... args) {
try{
Log.d(TAG, "Start doInBackground");
URL url = new URL(args[0]);
Log.d(TAG, "URL");
URLConnection connection;
connection = url.openConnection();
Log.d(TAG, "Open connection");
HttpURLConnection httpConnection = (HttpURLConnection)connection;
Log.d(TAG, "httpConnection");
Log.d(TAG, ""+ httpConnection.getResponseCode());
int responseCode = httpConnection.getResponseCode();
Log.d(TAG, "Response code: " + responseCode);
if(responseCode == HttpURLConnection.HTTP_OK) {
Log.d(TAG, "Start if");
InputStream in = httpConnection.getInputStream();
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document dom = db.parse(in);
Element docEle = dom.getDocumentElement();
NodeList nl = docEle.getElementsByTagName("quote");
if(nl != null && nl.getLength() > 0) {
Log.d(TAG, "Start second if");
for(int i = 0; i<nl.getLength(); i++) {
StockInfo theStock = getStockInformation(docEle);
daysLow = theStock.getDaysLow();
daysHigh = theStock.getDaysHigh();
yearLow= theStock.getYearLow();
yearHigh = theStock.getYearHigh();
name = theStock.getName();
lastTradePriceOnly = theStock.getLastTradePriceOnly();
change = theStock.getChange();
daysRange = theStock.getDaysRange();
Log.d(TAG, "End doInBackground");
}
}
}
}
catch(MalformedURLException e) {
Log.d(TAG, "MalformedURLException", e);
} catch(IOException e) {
Log.d(TAG, "IOException", e);
} catch(ParserConfigurationException e) {
Log.d(TAG, "Parser Configuration Exception", e);
} catch (SAXException e) {
Log.d(TAG, "SAX Exception", e);
}
finally{ }
return null;
}