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Let s suppose you have some static data you want to ship with the application, such as a list of words for a spell checker. The easiest way to deploy that is to place the file in the res/raw directory, so it will be put in the Android application APK file as part of the packaging process as a raw resource. To access this file, you need to get yourself a Resources object. From an activity, that is as simple as calling getResources(). A Resources object offers openRawResource() to get an InputStream on the file you specify. Rather than a path, openRawResource() expects an integer identifier for the file as packaged. This works just like accessing widgets via findViewById(). For example, if you put a file named words.xml in res/raw, the identifier is accessible in Java as R.raw.words. Since you can get only an InputStream, you have no means of modifying this file. Hence, it is really useful just for static reference data. Moreover, since it is unchanging until the user installs an updated version of your application package, either the reference data must be valid for the foreseeable future or you will need to provide some means of updating the data. The simplest way to handle that is to use the reference data to bootstrap some other modifiable form of storage (e.g., a database), but you end up with two copies of the data in storage. An alternative is to keep the reference data as is but keep modifications in a file or database, and merge them together when you need a complete picture of the information. For example, if your application ships a file of URLs, you could have a second file that tracks URLs added by the user or reference URLs that were deleted by the user.

The ProductImages table is also brief and contains only a few fields. This table will primarily contain binary data for the images that are associated with the products. The natural question to ask is, why not simply have an image field with the Products table itself Well, having a separate table for the image data will provide greater performance when querying the data from a dedicated table containing the binary images. Table 8-3 shows the specifics of the ProductImages table. Table 8-3. ProductImages Table

In the Files/Static sample project, you will find a reworking of the list box example from 7, this time using a static XML file instead of a hardwired array in Java. The layout is the same:

In the following sections, I ll discuss the individual fields of the ProductImages table. Figure 8-14 shows the fields.

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Common startup and shutdown logic should go in onCreate() and onDestroy();onStart() is mostly if your service needs data passed into it from the starting process and you don t wish to use IPC. For example, here is the onCreate() method for WeatherPlusService: @Override public void onCreate() { super.onCreate(); client=new DefaultHttpClient(); format=getString(R.string.url); myLocationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE); myLocationManager.requestLocationUpdates("gps", 10000, 10000.0f, onLocationChange); } First, we chain upward to the superclass, so Android can do any setup work it needs to have done. Then we initialize our HttpClient and format string as we did in the Weather demo. We then get the LocationManager instance for our application and request to get updates as our location changes, via the gps LocationProvider, which will be discussed in 33. The onDestroy() method is much simpler: @Override public void onDestroy() { super.onDestroy(); myLocationManager.removeUpdates(onLocationChange); } Here, we just shut down the location-monitoring logic, in addition to chaining upward to the superclass for any Android internal bookkeeping that might be needed. In addition to those lifecycle methods, though, your service also needs to implement onBind(). This method returns an IBinder, which is the linchpin behind the IPC mechanism. If you re creating a service class while reading this chapter, just have this method return null for now, and we ll fill in the full implementation in the next section.

The ProductImageID field is the primary key of the table and has an autoincrement property. Therefore, keeping with the consistency of the other tables, the data type will be an int, and no null values will be allowed.

< xml version="1.0" encoding="utf-8" > <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/selection" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <ListView android:id="@android:id/list" android:layout_width="fill_parent" android:layout_height="fill_parent" android:drawSelectorOnTop="false" /> </LinearLayout>

The ProductImage field is the only other field in the table; however, it has some unique characteristics compared to some of the others to this point. This field will contain the binary information for the image that is associated with the product. As a result of the information being in its binary form, the data type will be image, and no null values will be allowed.

In addition to that XML file, you also need an XML file with the words to show in the list:

When IPC Attacks!

The following script will create the ProductImages table: CREATE TABLE [ProductImages] ( [ProductImageID] [int] IDENTITY(1,1) NOT NULL, [ProductImage] [image] NOT NULL, CONSTRAINT [PK_ProductImages] PRIMARY KEY CLUSTERED ( [ProductImageID] ASC ) )

<words> <word value="lorem" /> <word value="ipsum" /> <word value="dolor" /> <word value="sit" /> <word value="amet" /> <word value="consectetuer" /> <word value="adipiscing" /> <word value="elit" /> <word value="morbi" /> <word value="vel" /> <word value="ligula" /> <word value="vitae" /> <word value="arcu" /> <word value="aliquet" /> <word value="mollis" /> <word value="etiam" /> <word value="vel" /> <word value="erat" /> <word value="placerat" /> <word value="ante" /> <word value="porttitor" /> <word value="sodales" /> <word value="pellentesque" /> <word value="augue" /> <word value="purus" /> </words>

The Orders table will be a major portion of the overall database. This table contains all the information about the items a customer intends to purchase. Table 8-4 shows the specifics of the Orders table. Table 8-4. Orders Table

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