The sixth chapter, an issue of using Internet resources

The example code in the sixth chapter today is not working. Prompt for objects that are not referenced.

Append Code Snippet

private void Refreshearthquakes () {
Get the XML
URL url;
try {
String quakefeed = getString (r.string.quake_feed);
url = new URL (quakefeed);

URLConnection connection;
Connection = Url.openconnection ();

HttpURLConnection httpconnection = (httpurlconnection) connection;
int responsecode = Httpconnection.getresponsecode ();

if (Responsecode = = HTTPURLCONNECTION.HTTP_OK) {
InputStream in = Httpconnection.getinputstream ();

Documentbuilderfactory dbf = Documentbuilderfactory.newinstance ();
Documentbuilder db = Dbf.newdocumentbuilder ();

Parse the earthquake feed.
Document dom = Db.parse (in);
Element Docele = Dom.getdocumentelement ();

Clear the old earthquakes
Earthquakes.clear ();

Get A list of each earthquake entry.
NodeList nl = docele.getelementsbytagname ("entry");
if (nl! = null && nl.getlength () > 0) {

　　　　 //The i=0 here is changed to I=1.
for (int i = 1; i < nl.getlength (); i++) {
Element entry = (element) nl.item (i);
Element title = (Element) entry.getelementsbytagname ("title"). Item (0);

Element g = (Element) entry.getelementsbytagname ("Georss:point"). Item (0);
Element g = (Element) Entry.getelementsbytagname ("Summary"). Item (0);

element when = (element) Entry.getelementsbytagname ("updated"). Item (0);
Element link = (Element) entry.getelementsbytagname ("link"). Item (0);

String details = Title.getfirstchild (). Getnodevalue ();
String hostname = "http://earthquake.usgs.gov";
String linkstring = hostname + link.getattribute ("href");

String point = G.getfirstchild (). Getnodevalue ();
String dt = When.getfirstchild (). Getnodevalue ();
SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd ' T ' hh:mm:ss ' Z ');
Date qdate = new GregorianCalendar (0,0,0). GetTime ();
try {
Qdate = sdf.parse (DT);
} catch (ParseException e) {
LOG.D (TAG, "Date parsing exception.", E);
}

string[] location = Point.split ("");
Location L = new location ("Dummygps");
L.setlatitude (Double.parsedouble (location[0));
L.setlongitude (Double.parsedouble (location[1));

String magnitudestring = Details.split ("") [1];
int end = Magnitudestring.length ()-1;
Double magnitude = double.parsedouble (magnitudestring.substring (0, end));

Details = Details.split (",") [1].trim ();

Quake Quake = new Quake (qdate, details, l, magnitude, linkstring);

Process a newly found earthquake
Addnewquake (Quake);
}
}
}
} 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 {
}
}
On the page to view the time, found that the No. 0 earthquake situation is not. So I can't find it.

This is true of the entire sample code, it's sad.

The sixth chapter, an issue of using Internet resources