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Android supports the concept of services. Services are components that run in the background, without a user interface. You can think of these components as Windows services or Unix services. Similar to these types of services, Android services are always available but don t have to be actively doing something. Android supports two types of services: local services and remote services. A local service is a service that is not accessible from other applications running on the device. Generally, these types of services simply support the application that is hosting the service. A remote service is accessible from other applications in addition to the application hosting the service. Remote services define themselves to clients using Android Interface Definition Language (AIDL). Let s begin our exploration of services by writing a simple service.

You can roll your own library for handling CGI requests. This process has some advantages, especially if you are trying to integrate your code into an existing code base. The disadvantages of this track are more apparent for complicated apps than for simple ones. I have found it convenient to embed miniweb servers in applications to provide easy access for clients and users. Although having your application as its own web server is probably not appropriate for every application, it is something to keep in mind because it can be a boon for control panels and for configuration of an application. Having the application as its own web server also reduces the external requirements for the application because they don t need to already be running a web server to use the functionality.

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To build a service, you extend the abstract class android.app.Service and put a service-configuration entry in your application s manifest file. Listing 8 7 shows an example.

You can get access to this directory by calling the appropriate method from the Context class, rather than hard-coding the path For example, you can call getFilesDir() on Context to get the current application s files directory Currently, this path looks like the following: /data/data/APP_PACKAGE_NAME/files Similarly, you can call getCacheDir() to get the application s cache directory Your application will have read and write permission on the contents of these folders, so you can create files dynamically and feed them to the player Observe that an application s /data directory differs greatly from its /res/raw folder The /raw folder is physically part of the apk file, and it s static that is, you cannot modify the apk file dynamically The contents of the /data directory, on the other hand, are dynamic Finally, if you use FileDescriptor, as shown in Listing 9-3, be sure to close the handle after calling setDataSource()..

Listing 8 7. A Simple Android Service Definition import android.app.Service; public class TestService1 extends Service { private static final String TAG = "TestService1"; @Override public void onCreate() { Log.d(TAG, "onCreate"); super.onCreate(); } @Override public IBinder onBind(Intent intent) { Log.d(TAG, "onBind"); return null; } } // service definition entry: must go in the AndroidManifest.xml file as // a child of <application>. <service android:name="TestService1"></service>

Ocamlnet is a third-party library that provides a number of features (CGI functions are only one part). Ocamlnet provides a class-based interface to CGI, FastCGI, the Jserv protocol, an embedded web server, and the Post Office Protocol (POP).

The service in Listing 8 7 isn t meant for practical use, but it serves our purpose of showing how a service is defined. To create a service, you write a class that extends android.app.Service and implements the onBind() method. You then put a servicedefinition entry in your AndroidManifest.xml file. That is how you implement a service. The next obvious question, then, is this: how do you call the service The answer depends on the service s client and requires a bit more discussion of services.

This concludes our discussion about playing audio content, so we ll now turn our attention to playing video. As you ll see, referencing video content is similar to referencing audio content. But we have not yet talked about playing content from the device s SD card, so we ll delve into that along the way.

We can gain more insight into the concept of a service by looking at the public methods of android.app.Service (see Listing 8 8).

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