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Native games like Doom and Wolf 3D, shown in later chapters, pack sound resources in their own formats and manipulate the sound device at the operating system level. Even though Android runs a Linux kernel behind the scenes, it is not a standard Linux distribution, especially with dealing with lowlevel devices, for example: The standard Linux sound device (/dev/dsp) and mixer (/dev/mixer) are not supported, making reusing sound logic very difficult for native games. For some reason, Google decided to use the Sonivox Enhanced Audio System (EAS) via the /dev/eac device. This caveat is compounded by the fact that Google provides no support for native development. Nevertheless, a solution is to cascade the sound name back to Java via JNI and play it using AudioClip. This technique is explained in detail in s 6 and 7. If you have native code that uses OpenAL/OpenGL for accelerated sound and graphics, you are in trouble. Google wants all development done in its Java-based version of OpenGL and doesn t support OpenAL. This leaves you with the painful task of translating OpenGL logic line by line from C to Java. Nevertheless, all is not lost. I found a neat trick to leave your C-based OpenGL code intact and still be able to run it from Java, and I explain my trick in 21.330 5.

number of barriers prevent hackers from working with files stored in a database, which makes them inherently more secure. You can use database users, roles, and permissions to limit access to files stored in a database. Similarly, you can use .NET authorization and NTFS file permissions to protect files in the file system. Both are fairly comparable in terms of protection when configured appropriately. Some people find it easier to maintain permissions solely in the database instead of worrying about the database and the file system. You can define .NET authorization and NTFS permissions on a file-by-file and folder-by-folder basis, however, which gives you much more granular control over application security.

In a situation where the locale requires German, our program will automatically pick up the resource named MyResources_deproperties The ResourceBundle is specified by invoking the method LoggersetResourceBundle (ResourceBundle name) It can also be set via the configuration file as follows: log4jloggerloggerNameresourceBundle=resourceBundle name The ResourceBundle loads the locale-specific properties file containing the message key and the localized message value, which the application uses to publish messages The Logger class provides the following methods for localized logging, which accept the Priority or Level object of the logging message, the localization key, and a Throwable instance: public void 17dlog(Priority p, String key, Throwable t); public void 17dlog(Priority p, String key, Object params[], Throwable t); The first method is a straightforward one It looks for the localized message with key as the localization key.

The write function is very similar to the read function, but you are updating a value instead of retrieving it: '*************************************************************************** Public Shared Function WriteValueToDatabase(ByVal Name As String, _ ByVal Value As String) As Boolean Try Dim SQL As String = "UPDATE [Settings] SET [Value]=@Value " & _

"WHERE [SettingName]=@SettingName;" Dim dbConn As New SqlConnection(Config.MyConnectionString) Dim dbCmd As New SqlCommand(SQL, dbConn) 'Setup the Value and SettingName parameters dbCmd.Parameters.Add("@Value", Data.SqlDbType.VarChar).Value = Value dbCmd.Parameters.Add("@SettingName", _ Data.SqlDbType.VarChar).Value = SettingName dbConn.Open() WriteValueToDatabase = (dbCmd.ExecuteNonQuery() > 0) dbConn.Close() Catch ex As Exception Return False End Try End Function The WriteValueToDatabase function takes two parameters: the Name of the setting and the Value. It uses the function parameters to set the parameter values for the SQL statement, similarly to what was done in the ReadValueFromDatabase function. Notice that the SQL only contains an UPDATE statement. This method assumes that the configuration setting already exists in the database. It then opens a connection to the database, and executes the SQL statement using the ExecuteNonQuery function of the dbCmd object. ExecuteNonQuery returns an Integer indicating the number of items that were updated, so (dbCmd.ExecuteNonQuery() > 0) evaluates to True if an item was updated or False if nothing was updated. This value is then assigned to the name of the function so it will be returned when the function exists. The database is then closed. If an error occurs at all during this process, False is returned. With this function, writing a setting to the database can be accomplished using the following statement: WriteValueToDatabase("MyString","Hello World") WriteValueToDatabase("MyInteger",CStr(MyInteger))

Key and touch events can be handled by overloading the following methods (as shown in Listing 3-9): onKeyDown: This event fires when a key is pressed. The event receives two arguments: an integer representing the key code and a KeyEvent. Note that the key code is an integer value defined by Android not related to the standard ASCII keys. To test for a specific key, simply compare the value with the static key constants in KeyEvent. onKeyUp: This event fires when a key is released, and it receives the same arguments as onKeUp. Furthermore, you can also check the status of the Shift or Alt keys using event.isShiftPressed() or event.isAltPressed() respectively. onTouchEvent: This event fires when you tap the screen, and it receives a MotionEvent. Tap events have two states: DOWN and UP just like key events. You can check the tap state by comparing event.getAction() with MotionEvent.ACTION_DOWN or MotionEvent.ACTION_UP. You can also get the X and Y coordinates relative to the upper-left corner of the screen.