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parser. In particular, take note of the JobListHandler. SAX is a callback parser, meaning that it invokes a user-supplied method to process events in the parsing process. It s up to the JobListHandler (in our example) to process the data as appropriate. We have one more class to go before we can jump back to the higher-level functionality of our application. The next section takes a quick tour of the JobListHandler, which is responsible for putting together a JobList from an XML data source.

To delete this log file, use this command:

The schematic for our LED display project is presented in Figure 12-3 The circuit is extremely straightforward all we are doing is making the necessary connections between the MAX7219 and our four-digit LED display and including the ISET resistor circuit and the 10uF electrolytic capacitor recommended in the 7219 datasheet The 12 pins of the LED display are arranged in two rows of six pins each, which follow the standard IC pinnumbering convention If you are looking down at

As presented earlier, our application uses an XML data storage structure. This XML data can come from either the server or from a local file on the filesystem. In either case, the application must parse this data and transform it into a useful form. This is accomplished through the use of the SAX XML parsing engine and the JobListHandler, which is shown in listing 12.11. The JobListHandler is used by the SAX parser for our XML data, regardless of the data s source. Where the data comes from dictates how the SAX parser is set up and invoked in this application. The JobListHandler behaves slightly differently depending on whether the class s constructor includes a Handler argument. If the Handler is provided, the JobListHandler will pass messages back for use in a ProgressDialog. If the Handler argument is null, this status message passing is bypassed. When parsing data from the server, the ProgressDialog is employed; the parsing of a local file is done quickly and without user feedback. The rationale for this is simple the network connection may be slow and we need to show progress information to the user. An argument could be made for always showing the progress of the parse operation, but this approach gives us an opportunity to demonstrate more conditionally operating code.

PIPHP_RefererLog("referlog", "delete");

package com.msi.manning.UnlockingAndroid; // multiple imports omitted for brevity, see full source code public class JobListHandler extends DefaultHandler { Handler phandler = null; JobList _list; JobEntry _job; String _lastElementName = ""; StringBuilder sb = null; JobListHandler Context _context; constructor JobListHandler(Context c,Handler progressHandler) { _context = c; if (progressHandler != null) { phandler = progressHandler; Check for Message msg = new Message(); progress handler msg.what = 0; msg.obj = (Object)("Processing List"); phandler.sendMessage(msg); } } getList method public JobList getList() {

12

Or to reset the log file by truncating it back to zero length, use:

Message msg = new Message(); msg.what = 0; msg.obj = (Object)("Fetching List"); if (phandler != null) phandler.sendMessage(msg); return _list;

startDocument } method public void startDocument() throws SAXException { Message msg = new Message(); msg.what = 0; msg.obj = (Object)("Starting Document"); if (phandler != null) phandler.sendMessage(msg); _list = new JobList(_context); _job = new JobEntry(); endDocument } method public void endDocument() throws SAXException { Message msg = new Message(); msg.what = 0; msg.obj = (Object)("End of Document"); if (phandler != null) phandler.sendMessage(msg); } public void startElement (String namespaceURI, String localName,String qName, Attributes atts) throws SAXException { try { sb = new StringBuilder(""); if (localName.equals("job")) { Message msg = new Message(); msg.what = 0; msg.obj = (Object)(localName); if (phandler != null) phandler.sendMessage(msg); _job = new JobEntry(); } } catch (Exception ee) { } } public void endElement (String namespaceURI, String localName, String qName) throws SAXException { if (localName.equals("job")) { Check for end // add our job to the list! of job element _list.addJob(_job); Message msg = new Message(); msg.what = 0; msg.obj = (Object)("Storing Job # " + _job.get_jobid()); if (phandler != null) phandler.sendMessage(msg); return; } // portions of the code omitted for brevity } public void characters(char ch[], int start, int length) { String theString = new String(ch,start,length); Build up String Log.d("CH12","characters[" + theString + "]"); incrementally sb.append(theString); }

PIPHP_RefererLog("referlog", "reset");

Figure 12-3