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Listing 12.13 managejobs.xml
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< xml version="1.0" encoding="utf-8" > <LinearLayout xmlns:android="" android:id="@+id/joblistview" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="vertical" > <TextView android:id="@+id/statuslabel" android:text="list jobs here " android:layout_height="wrap_content" android:layout_width="fill_parent" /> <ListView android:id="@+id/joblist" android:layout_height="fill_parent" android:layout_width="fill_parent" /> </LinearLayout>
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The code in listing 12.14 for the ManageJobs Activity connects a JobList to the GUI and reacts to the selection of a particular job from the ListView. In addition, this class demonstrates taking the result from another, synchronously invoked Activity and processing it according to its specific requirement. For example, when a job is completed and closed, that JobEntry is updated to reflect its new status.
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Figure 12.9 ManageJobs Activity lists downloaded jobs.
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Listing 12.14, which implements the ManageJobs Activity
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package com.msi.manning.UnlockingAndroid; // multiple imports omitted for brevity, see full source public class ManageJobs extends Activity implements OnItemClickListener { final int SHOWJOB = 1; Prefs myprefs = null; JobList _joblist = null; ListView jobListView; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle);
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setContentView(R.layout.managejobs); myprefs = new Prefs(this.getApplicationContext()); TextView tv = (TextView) findViewById(; _joblist = JobList.parse(this.getApplicationContext()); if (_joblist == null) { _joblist = new JobList(this.getApplicationContext()); } Check for
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Parse data in storage Handle bad parse
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empty JobList if (_joblist.getJobCount() == 0){ Process click tv.setText("There are No Jobs Available"); events on List } else { tv.setText("There are " + _joblist.getJobCount() + " jobs."); Use a } Connect ListView to UI
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list layout jobListView = (ListView) findViewById(; ArrayAdapter<JobEntry> adapter = new ArrayAdapter<JobEntry>(this, android.R.layout.simple_list_item_1, _joblist.getAllJobs()); jobListView.setAdapter(adapter); Connect list with jobListView.setOnItemClickListener(this); dataevents on List jobListView.setSelection(0);
} public void onItemClick(AdapterView parent, Prepare Fetch job from View v, int position, long id) { Intent for list by ordinal showing JobEntry je = _joblist.getJob(position); Job details Log.i("CH12", "job clicked! [" + je.get_jobid() + "]"); Intent jobintent = new Intent(this, ShowJob.class); Bundle b = je.toBundle(); Use Bundle to jobintent.putExtras(b); store Job data startActivityForResult(jobintent, SHOWJOB); Start } ShowJob Activity
@Override protected void onActivityResult(int requestCode, int resultCode, data) { switch (requestCode) { Check case SHOWJOB: return code if (resultCode == 1){ Log.d("CH12","Good Close, let's update our list"); JobEntry je = JobEntry.fromBundle(data.getExtras()); _joblist.replace(je); Update the list with } via replace method break; } }
Extract returned JobEntry
The objective of this code is to display a list of available jobs to the user in a ListView D. To display the list of jobs, we must first parse the list stored on the device B. Note that the Context argument is required to allow the JobList class access to the private file area for this application. If the parse fails, we initialize the JobList instance to a new, empty list. This is a somewhat simplistic way to handle the error without the GUI falling apart C.
Source code for managing jobs
When a specific job is selected, its details are extracted via a call to the getJob method E. The job is stored in a Bundle, put into an Intent F, and subsequently sent to the ShowJob Activity for display and/or editing G. Note the use of the constant SHOWJOB as the last parameter of the startActivityForResult method. When the called-Activity returns, the second parameter to startActivityForResult is passed back when the onActivityResult method is invoked H and the return code checked. To obtain the changed JobEntry, you need to extract it from the Intent with a call to getExtras(), which returns a Bundle. This Bundle is turned into a JobEntry instance via the static fromBundle method of the JobEntry class. To update the list of jobs to reflect this changed JobEntry, call the replace method I.
More on bundles
You need to pass the selected job to the ShowJob Activity, but you can t casually pass an object from one Activity to another. You don t want the ShowJob Activity to have to parse the list of jobs again; otherwise you could simply pass back an index to the selected job by using the integer storage methods of a Bundle. Perhaps you could store the currently selected JobEntry (and JobList for that matter) in a global data member of the Application object, had you chosen to implement one. If you recall in chapter 1 when we discussed the ability of Android to dispatch Intents to any Activity registered on the device, you want to keep the ability open to an application other than your own to perhaps pass a job to you. If that were the case, using a global data member of an Application object would never work! The likelihood of such a step is low, particularly considering how the data is stored in this application. This chapter s sample application is an exercise of evaluating some mechanisms you might employ to solve data movement around when programming for Android. The chosen solution is to package the data fields of the JobEntry in a Bundle (F in listing 12.14) to move a JobEntry from one Activity to another. In the strictest sense, you re not moving a real JobEntry object but a representation of a JobEntry s data members. The net of this discussion is that this method creates a new Bundle by using the toBundle() method of the JobEntry.
Now that you can view and select the job of interest, it s time to look at just what you can do with that job. Before diving into the next section, be sure to review the ManageJobs code carefully to understand how the JobEntry information is passed between the two activities.
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