(Not getting answers on StackOverflow [
http://stackoverflow.com/questions/5429455/xmlpullparser-in-a-thread-returns-nothing-every-other-run-wh
] , so I thought I'd try here.)
I have a simple `XmlPullParser` in a non-UI thread that parses some
data from an XML over HTTP and stores it in a local MySQL database.
The first time around, the parsing operation goes beautifully and all
the data ends up where it should. But without fail, if I start the
parse operation again (assuming the activity hasn't been destroyed and
recreated in the meantime), it returns nothing. It doesn't throw up
any exceptions; rather it acts as if it's already at the end of the
file and simply finishes without finding any tags. Then if I run it a
third time, it works fine again, and the cycle repeats.
Is there a method I should be calling to properly close the parser
when it's finished? I looked around in the docs and examples but
couldn't find anything about it.
Here's a cut-down version of the relevant code:
parseThread = new Thread () {
public void run() {
mDB.delete(directoryPeople.TEMP_TABLE, null, null);
XmlPullParserFactory parserCreator =
XmlPullParserFactory.newInstance();
XmlPullParser parser = parserCreator.newPullParser();
URL feed = new URL(directoryUrl);
parser.setInput(feed.openStream(), null);
ContentValues entry = new ContentValues();
int parserEvent = parser.getEventType();
String tag = "";
String value = "";
entryCount = 0;
while (parserEvent != XmlPullParser.END_DOCUMENT) {
if(parserEvent == XmlPullParser.START_TAG) {
tag = parser.getName();
if (isPeopleField(tag)) {
parserEvent = parser.next();
value = parser.getText();
entry.put(tag, value.replaceAll("\n", ""));
}
}
if(parserEvent == XmlPullParser.END_TAG &&
parser.getName().compareTo("ROW") == 0) {
mDB.insert(directoryPeople.TEMP_TABLE, null,
entry);
entryCount++;
hUpdateProgressBar.sendEmptyMessage(0);
entry.clear();
}
parserEvent = parser.next();
}
/** Copy temp table to permanent table */
mDB.delete(directoryPeople.PEOPLE_TABLE, null, null);
String copyQuery = "INSERT INTO " +
directoryPeople.PEOPLE_TABLE
+ " SELECT * FROM " + directoryPeople.TEMP_TABLE;
mDB.execSQL(copyQuery);
/** Delete contents of temp table */
mDB.delete(directoryPeople.TEMP_TABLE, null, null);
mHandler.post(new Runnable() {
public void run() {
adapter.getCursor().requery();
}
});
}
};
parseThread.start();
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