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msg.what = 0; msg.obj = (Object)("Job Closed Successfully"); progresshandler.sendMessage(msg); je.set_status("CLOSED"); CloseJob.this.setResult(1,"",je.toBundle()); } else { msg = new Message(); msg.what = 0; msg.obj = (Object)("Failed to Close Job"); progresshandler.sendMessage(msg); CloseJob.this.setResult(0); } } catch (Exception e) { Log.d("CH12","Failed to submit job close signature: " + e.getMessage()); } msg = new Message(); msg.what = 1; progresshandler.sendMessage(msg); } }
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Update local JobEntry status
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Set result and store updated JobEntry
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At this point, you have a signature on the screen and need to capture it. A new FileOutputStream B is obtained for a file on the local filesystem, and the signature is written to this file. You re now ready to transmit this file to the server remember, you want to bill the client as soon as possible for work completed! In preparation for sending the signature to the server, the signature file contents are read into a byte array via an instance of a FileInputStream. Using the Prefs instance to get specific configuration information, a URL c is constructed in order to POST data to the server. The query String of the URL contains the jobid and the POST data contains the image itself. A BufferedOutputStream d is employed to POST data, which consists of the captured signature in JPEG format. Once the job data and signature have been sent to the server, the response data is read back from the server e. A specific string indicates a successful transmission f. Upon successful closing, the JobEntry status member is marked as CLOSED g, and this JobEntry is converted to a Bundle so that it may be communicated to the caller by invoking the setResult() method h. Once the Handler receives the I m done message and the Activity finishes, this data is propagated back to the ShowJob and all the way back to the ManageJob Activity. And that thankfully wraps up the source code review for the Android side of things! There were some methods omitted from this text to limit this already very long chapter, so please be sure to examine the full source code. Now it s time to look at the server application. jobs
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12.5 Server code
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A mobile application often relies on server-side resources, and our field service application is no exception. This isn t a book on server-side development techniques, serverrelated code, and discussion, so we ll present these things briefly. We ll introduce the
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Putting Android to work in a field service application
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UI and the accompanying database structure that makes up our list of job entries, and
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then we ll review the two server-side transactions that concern the Android application. The server code relies on open source staples: MySQL and PHP. Let s get started with the interface used to enter new jobs, used by the dispatcher.
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12.5.1 Dispatcher user interface
Before jumping into any server code specific items, it s important to understand how the application is organized. All jobs entered by a dispatcher are assigned to a particular mobile technician. That identifier is interpreted as an email address, as seen in the Android example where the user ID was used throughout the application. Once the user ID is specified, all of the records revolve around that data element. For example, figure 12.14 demonstrates this by showing the jobs assigned to the author, fableson@msiservices.com.
NOTE
This application is available for testing the sample application yourself. It s located at http://android12.msi-wireless.com. Sign on and add jobs for your email address.
Let s now turn our attention to the underlying data structure, which contains the list of jobs.
12.5.2 Database
As mentioned earlier in section 12.1.3, the database in use in this application is MySQL,2 with a single database table called tbl_jobs. The SQL to create this table is provided in the next listing.
The server-side dispatcher screen
For more on development using MySQL, try the developer zone: http://dev.mysql.com/.
Server code
Listing 12.19 Data definition for tbl_jobs
CREATE TABLE IF NOT EXISTS 'tbl_jobs' ( Unique record ID 'jobid' int(11) NOT NULL auto_increment, 'status' varchar(10) NOT NULL default 'OPEN', User identification 'identifier' varchar(50) NOT NULL, 'address' varchar(50) NOT NULL, 'city' varchar(30) NOT NULL, 'state' varchar(2) NOT NULL, 'zip' varchar(10) NOT NULL, 'customer' varchar(50) NOT NULL, 'product' varchar(50) NOT NULL, Product URL 'producturl' varchar(100) NOT NULL, 'comments' varchar(100) NOT NULL, UNIQUE KEY 'jobid' ('jobid') ) ENGINE=MyISAM DEFAULT CHARSET=ascii AUTO_INCREMENT=25 ;
Each row in this table is uniquely identified by the jobid B, which is an autoincrementing integer field. The identifier field C corresponds to the user ID/email of the assigned mobile technician. The producturl field D is designed to be a specific URL to assist the mobile technician in the field in quickly gaining access to helpful information for completing the assigned job. The next section provides a road map to the server code.
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