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12.2.2 List of source files
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The source code for this application consists of 12 Java source files, one of which is the R.java file, which you ll recall is automatically generated based on the resources in the application. This section presents a quick introduction to each of these files. We won t explain any code yet; we want you to know a bit about each file, and then it ll be time to jump into the application, step by step. Table 12.1 lists the source files in the Android field service application.
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Table 12.1 Source files used to implement the field service application Description Activity provides splash screen functionality. Activity provides management of username and server URL address. Activity provides the main screen of the application. Activity interacts with server to obtain updated list of jobs. Activity provides access to list of jobs. Activity provides detailed information on a specific job, such as an address lookup, or initiates the signature-capture process. Activity collects electronic signature and interacts with the server to upload images and mark jobs as CLOSED. Automatically generated source file representing identifiers in the resources. Helper class encapsulating SharedPreferences. Class that represents a job. Includes helpful methods used when passing JobEntry objects from one Activity to another.
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Source filename Splash.java ShowSettings.java FieldService.java RefreshJobs.java ManageJobs.java ShowJob.java
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CloseJob.java
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R.java Prefs.java JobEntry.java
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Mapping out the application flow
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Table 12.1 Source files used to implement the field service application (continued) Description
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Source filename JobList.java
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Class representing the complete list of JobEntry objects. Includes methods for marshaling and unmarshaling to nonvolatile storage. Class used for parsing XML document containing job data.
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JobListHandler.java
The application also relies on layout resources to define the visual aspect of the UI. In addition to the layout XML files, an image used by the Splash Activity is placed in the drawable subfolder of the res folder along with the stock Android icon image. This icon is used for the home application launch screen. Figure 12.4 depicts the resources used in the application. In an effort to make navigating the code as easy as possible, table 2.2 shows the field service application resource files. Note that each is clearly seen in figure 12.4, which is a screenshot from our project open in Eclipse. Examining the source files in this application tells us that we have more than one Activity in use. To enable navigation between one Activity and the next, our application must inform Android of the existence of these Activity classes. Recall from chapter 1 that this registration step is accomplished with the Figure 12.4 Resource files used in the sample application AndroidManifest.xml file.
Table 12.2 Resource files used in the sample application Description Image used in the Splash Activity. Image used in the application launcher. Layout for main application screen, FieldService Activity. Layout for the list of jobs, ManageJobs Activity. Layout for the screen shown when refreshing job list, RefreshJobs Activity. Layout for job detail screen, ShowJob Activity. Layout for configuration/settings screen, ShowSettings Activity. Layout for splash screen, Splash Activity. Strings file containing extracted strings. Ideally all text is contained in a strings file for ease of localization. This application s file contains only the application title.
Filename android.jpg icon.jpg fieldservice.xml managejobs.xml refreshjobs.xml
showjob.xml showsettings.xml splash.xml strings.xml
Putting Android to work in a field service application
12.2.3 Field service application s AndroidManifest.xml
Every Android application requires a manifest file to let Android properly wire things up when an Intent is handled and needs to be dispatched. Take a look at the AndroidManifest.xml file used by our application, shown in the following listing.
Listing 12.1 The field service application s AndroidManifest.xml file
< xml version="1.0" encoding="utf-8" > <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.msi.manning.UnlockingAndroid"> Entry point, Intent filter <application android:icon="@drawable/icon"> Splash for main <activity android:name=".Splash" Activity launcher android:label="@string/app_name"> visibility <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".FieldService" > </activity> <activity android:name=".RefreshJobs" > </activity> Application s <activity android:name=".ManageJobs" > defined </activity> Activity list <activity android:name=".ShowJob" > </activity> <activity android:name=".CloseJob" > </activity> <activity android:name=".ShowSettings" > </activity> Required </application> permission <uses-sdk android:minSdkVersion="6"/> for internet <uses-permission android:name="android.permission.INTERNET"> access </uses-permission> </manifest>
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