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A service, running in the background, needs a way to let users know something of interest has occurred, such as when e-mail has been received. Moreover, the service may need some way to steer users to an activity where they can act on the event, such as reading a received message. For this, Android supplies status bar icons, flashing lights, and other indicators collectively known as notifications . Your current phone may already have such icons, to indicate battery life, signal strength, whether Bluetooth is enabled, and the like. With Android, applications can add their own status bar icons, with an eye toward having them appear only when needed (e.g., a message has arrived). In Android, you can raise notifications via the NotificationManager. The NotificationManager is a system service. To use it, you need to get the service object via getSystemService(NOTIFICATION_SERVICE) from your activity. The NotificationManager gives you three methods: one to pester (notify()) and two to stop pestering (cancel() and cancelAll()).

1. The size of the image, and hence the size of the resulting card. If you just supply a number, it is interpreted as a size in bytes. Alternatively, you can append K or M to the number to indicate a size in kilobytes or megabytes, respectively. 2. The filename under which to store the image. For example, to create a 1GB SD card image, to simulate the G1 s SD card in the emulator, you could run: mksdcard 1024M sdcard.img

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This exercise shows how to create the new DataBaseHelper class file and add the associated code. Follow these steps: 1. The first step is to add the actual class file. As you have done several times in previous exercises, right-click the LittleItalyVineyard.DataAccess class library project, and select Add Class. You will then see the Add New Item dialog box. Name the class DataBaseHelper, as shown in Figure 12-8, and click Add.

The notify() method takes a Notification, which is a data structure that spells out the form your pestering should take. The capabilities of this object are described in the following sections.

Figure 12-8. Adding the DataBaseHelper class file 2. After adding the new class, you will see the standard shell code for a new class. For the DataBaseHelper class, have it inherit from the DataAccessBase, and add the public identifier for the class, as shown here: using System; using System.Collections.Generic; using System.Text; namespace LittleItalyVineyard.DataAccess { public class DataBaseHelper : DataAccessBase { } } 3. Next, add some declarations to the namespaces at the top of the code. The namespaces will be System.Data, System.Data.SqlClient, and finally Microsoft.ApplicationBlocks.Data, as shown here: using using using using using System; System.Collections.Generic; System.Text; System.Data; System.Data.SqlClient;

To have your emulator use this SD card image, start the emulator with the -sdcard switch, containing a fully-qualified path to the image file you created using mksdcard. While there will be no visible impact there is no icon or anything in Android showing that you have a card mounted the /sdcard path will now be available for reading and writing. To put files on the /sdcard, either use the File Explorer in DDMS or adb push and adb pull from the console.

Here is the Button from the previous chapter s sample application, converted into an XML layout file, found in the Layouts/NowRedux sample project:

using Microsoft.ApplicationBlocks.Data; namespace LittleItalyVineyard.DataAccess {

< xml version="1.0" encoding="utf-8" > <Button xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/button" android:text="" android:layout_width="fill_parent" android:layout_height="fill_parent"/>

public class DataBaseHelper : DataAccessBase { } } 4. You are now ready to add the individual functions and properties to the class. To begin, first add a field for an array of SqlParameters along with its associated property, Parameters: using using using using using System; System.Collections.Generic; System.Text; System.Data; System.Data.SqlClient;

bviously, this book does not cover everything. And while your number-one resource (besides the book) is going to be the Android SDK documentation, you are likely to need information beyond what s covered in either of those places. Searching online for android and a class name is a good way to turn up tutorials that reference a given Android class. However, bear in mind that tutorials written before late August 2008 are probably written for the M5 SDK and, therefore, will require considerable adjustment to work properly in current SDKs. Beyond randomly hunting around for tutorials, though, this chapter outlines some resources to keep in mind.

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