// String... arg0 is the same as String[] args
protected String doInBackground(String... args) {
try {
// Get the XML URL that was passed in
URL url = new URL(args[0]);
// connection is the communications link between the
// application and a URL that we will read from.
URLConnection connection;
connection = url.openConnection();
// Used to take advantage of HTTP specific features.
// Provides tools that tell us if a connection was
// made, lost and other HTTP Status Codes
HttpURLConnection httpConnection = (HttpURLConnection) connection;
// Did we connect properly the the URL?
int responseCode = httpConnection.getResponseCode();
// Tests if responseCode == 200 Good Connection
if (responseCode == HttpURLConnection.HTTP_OK) {
// Reads data from the connection
InputStream in = httpConnection.getInputStream();
// Provides a way to parse DOM object trees from XML documents
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
// Provides a DOM Document from an xml page
DocumentBuilder db = dbf.newDocumentBuilder();
// Parse the Yahoo Financial YQL Stock XML File
Document dom = db.parse(in);
// The root element is query
Element docEle = dom.getDocumentElement();
// Get a list of quote nodes
NodeList nl = docEle.getElementsByTagName("quote");
// Checks to make sure we found a quote tag
if (nl != null && nl.getLength() > 0) {
// Cycles through if we find multiple quote tags
// Mainly used for demonstration purposes
for (int i = 0; i < nl.getLength(); i++) {
// Passes the root element of the XML page, so
// that the function below can search for the
// information needed
StockInfo theStock = getStockInformation(docEle);
// Gets the values stored in the StockInfo object
daysLow = theStock.getDaysLow();
daysHigh = theStock.getDaysHigh();
yearLow = theStock.getYearLow();
yearHigh = theStock.getYearHigh();
name = theStock.getName();
lastTradePriceOnly = theStock.getLastTradePriceOnly();
change = theStock.getChange();
daysRange = theStock.getDaysRange();
// Outputs information for tracking reasons only
Log.d(TAG, "Stock Name " + name);
Log.d(TAG, "Stock Year High " + yearHigh);
Log.d(TAG, "Stock Year Low " + yearLow);
Log.d(TAG, "Stock Days High " + daysHigh);
Log.d(TAG, "Stock Days Low " + daysLow);
}
}
}
} 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;
}
