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Source code for managing jobs
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Upon completion of the CloseJob Activity, the onActivityResult callback is invoked. When this situation occurs, this method receives a Bundle containing the data elements for the recently closed JobEntry B. If you recall, the ShowJob Activity was launched for result. , which permits a synchronous pattern, passing the result back to the caller. The requirement is to propagate this JobEntry data back up to the calling Activity, ManageJobs. Calling setResult() and passing the Bundle (obtained with getExtras()) fulfills this requirement. Despite the simple appearance of some text and a few easy-to-hit buttons, the ShowJob Activity provides a significant amount of functionality to the user. All that remains is to capture the signature to close out the job. Doing so requires an examination of the CloseJob Activity.
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12.4.4 Capturing a signature with the CloseJob Activity
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Our faithful mobile technician has just completed the maintenance operation on the part and is ready to head off to lunch before stopping for another job on the way home, but first he must close out this job with a signature from the customer. To accomplish this, the field service application presents a blank screen, and the customer uses a stylus (or a mouse in the case of the Android Emulator) to sign the device, acknowledging that the work has been completed. Once the signature has been captured, the data is submitted to the server. The proof of job completion has been captured, and the job can now be billed. Figure 12.13 demonstrates this sequence of events. This Activity can be broken down into two basic functions: the capture of a signature and the transmittal of job data to the server. Notice that this Activity s UI has no layout resource. All of the UI elements in this Activity are generated dynamically, as
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The CloseJob Activity capturing a signature and sending data to the server
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Local queuing
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One element not found in this sample application is the local queuing of the signature. Ideally this would be done in the event that data coverage isn t available. The storage of the image is quite simple; the perhaps more challenging piece is the logic on when to attempt to send the data again. Considering all the development of this sample application is done on the Android Emulator with near-perfect connectivity, it s of little concern here. But in the interest of best preparing you to write real-world applications, it s worth reminding you of local queuing in the event of communications trouble in the field.
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shown in listing 12.16. In addition, the ProgressDialog introduced in the RefreshJobs Activity is brought back for an encore, to let our mobile technician know that the captured signature is being sent when the Sign & Close menu option is selected. If the user selects Cancel, the ShowJob Activity resumes control. Note that the signature should be made prior to selecting the menu option.
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Listing 12.16 CloseJob.java GUI setup
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package com.msi.manning.UnlockingAndroid; // multiple imports omitted for brevity, see full source public class CloseJob extends Activity { ProgressDialog myprogress; Handler progresshandler; Message msg; JobEntry je = null; private closejobView sc = null; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); Intent startingIntent = getIntent(); if (startingIntent != null) { Bundle b = startingIntent.getExtras() if (b != null) { je = JobEntry.fromBundle(b); } } sc = new closejobView(this); Instantiate instance of setContentView(sc); closejobView if (je == null) {
finish(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(0,0,"Sign & Close"); menu.add(0,1,"Cancel"); return true; }
Define available menus
Source code for managing jobs
public boolean onOptionsItemSelected(Menu.Item item) { Prefs myprefs = new Prefs(CloseJob.this.getApplicationContext()); switch (item.getId()) { Handle case 0: selected menu try { myprogress = ProgressDialog.show(this, "Closing Job ", "Saving Signature to Network",true,false); progresshandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 0: myprogress.setMessage("" + (String) msg.obj); break; case 1: myprogress.cancel(); finish(); break; } super.handleMessage(msg); } }; Start Thread Thread workthread = new to CloseJob Thread(new DoCloseJob(myprefs)); workthread.start(); } catch (Exception e) { Log.d("closejob",e.getMessage()); msg = new Message(); msg.what = 1; progresshandler.sendMessage(msg); } return true; case 1: finish(); return true; } return false; }
Unlike previous activities in this chapter, the UI doesn t come from a design timedefined layout, but rather an instance of a closejobView B is the primary UI. The closejobView is defined in listing 12.17. The onCreateOptionsMenu method c is an override of the base View s method, allowing a convenient way to add menus to this screen. Note that two menus are added, one for Sign & Close and one for Cancel. The onOptionsItemSelected method d is invoked when the user selects a menu item. A ProgressDialog and accompanying Handler are instantiated when the user chooses the menu to close a job. Once the progress-reporting mechanism is in place, a new Thread is created and started in order to process the steps required to close the job e. Note that an instance of Prefs is passed in as an argument to the constructor, as that will be needed to store a signature, as we ll show in listing 12.18.
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