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@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. <service android:name="TestService1"></service> 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 service-definition 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 on services.

You will be able to exercise this code as long you have a simple activity with a simple view (like the one in the previous section) and a menu item to invoke tryOneOfThese(activity). Creating a simple menu is easy (see Listing 3 33).

This example shows how the text analysis tools associated with OCaml can be used in very powerful ways. You don t have to be a total compiler junkie to use them or be interested in writing your own languages. These tools can help you solve problems that you might have had with other tools. They also help you to understand how languages are constructed (even if you re not very interested in knowing about that).

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Listing 3 33. A Test Harness to Create a Simple Menu public class HelloWorld extends Activity { public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); TextView tv = new TextView(this); tv.setText("Hello, Android. Say hello"); setContentView(tv); registerMenu(this.getTextView()); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); int base=Menu.FIRST; // value is 1 MenuItem item1 = menu.add(base,base,base,"Test"); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) if (item.getItemId() == 1) { IntentUtils.tryOneOfThese(this); } else { return super.onOptionsItemSelected(item); } return true; } } {

We can gain more insight into the concept of a service by looking at the public methods of androidappService (see Listing 8-8) Listing 8-8 The Public Methods of a Service Application getApplication(); abstract IBinder onBind(Intent intent); void onConfigurationChanged(Configuration newConfig); void onCreate(); void onDestroy(); void onLowMemory(); void onRebind(Intent intent); void onStart(Intent intent, int startId); boolean onUnbind(Intent intent); final void setForeground(boolean isForeground); final void stopSelf(); final void stopSelf(int startId); final boolean stopSelfResult(int startId); The getApplication() method returns the application that implements the service The onBind() method provides an interface for external applications running on the same device to talk to the service onConfigurationChanged() allows the service to reconfigure itself if the device configuration changes The system calls onCreate() when the service is first created, but before calling onStart() This process, which resembles the process for creating an activity, provides a way for the service to perform one-time initialization at startup.

NOTE: See 2 for instructions on how to make an Android project out of these files, as well as how to compile and run it. You can also read the early parts of 5 to see more sample code relating to menus.

bjective Caml includes very powerful object-oriented features. Although that might seem somewhat obvious given that objective is in the language name, the extent and focus of the object system in OCaml is different from many other object-oriented languages currently in use. OCaml provides an object system that is primarily focused on being a tool for software reuse and encapsulation. Many programmers find that the OCaml module system provides much (if not all) of the functionality commonly found in object systems. Features such as data hiding and code reuse are definitely an important part of the module system. However, modules cannot be inherited and extended in the way that objects can. It is often easier to use objects to describe data relationships that are actually objective instead of trying to manipulate your data model in a way that is compatible with the OCaml module system. Modules also lack the capability to be polymorphic in the way that objects can. This chapter is not meant to be an introduction to object-oriented programming (OOP). If you have no prior experience with OOP there are topics in this chapter that might be confus, ing. If you have had experience with it, you should take special care. OCaml uses terminology found in other object-based languages, but these terms might not mean the same thing. Objects in OCaml still must obey the rules of the type system and follow other syntax restrictions. As in other aspects of OCaml development, you should never assume that a keyword in OCaml means the same thing as a keyword in another language.

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