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The default match is present if there are no matches defined. The compiler also gives a warning if your pattern matches are not exhaustive and if you have matches that will never hit. Having a default match does not make your functions polymorphic. The compiler infers the most generic type the arguments can be and assigns them accordingly. Having a default match doesn t change the fact that a function can have only one return type.

As we discussed earlier, drawing in OpenGL involves implementing the Renderer interface. The signature of this interface is shown in Listing 10 9.

Listing 10 9. The Renderer Interface public static interface GLSurfaceView.Renderer { void onDrawFrame(GL10 gl); void onSuraceChanged(GL10 gl, int width, int height); void onSurfaceCreated(GL10 gl, EGLConfig config); }

Last but not least, Android ties all these concepts into an application by creating a single XML file that defines what an application package is. This file is called the application s manifest file (AndroidManifest.xml). Here is an example: < xml version="1.0" encoding="utf-8" > <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ai.android.HelloWorld" android:versionCode="1" android:versionName="1.0.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".HelloWorld" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> The Android manifest file is where activities are defined, where services and content providers are registered, and where permissions are declared. Details about the manifest file will emerge throughout the book as we develop each idea.

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You can pretty much do anything you would normally do in OCaml inside an inner let binding, but you need to always be aware of scoping issues. Like most languages, you should use parentheses to clearly show scope:

The main drawing happens in the onDrawFrame() method. Whenever a new surface is created for this view, the onSurfaceCreated() method is called and we can call a number of OpenGL APIs such as dithering, depth control, or any others that can be called outside of the immediate onDrawFrame() method.

Similarly, when a surface changes, such as the width and height of the window, the onSurfaceChanged() method is called. You can set up your camera and viewing volume here. Even in the onDrawFrame() method there are lot of things that may be common for your specific drawing context. You can take advantage of this commonality and abstract these methods in another level of abstraction called an AbstractRenderer which will have only one method that is left unimplemented called draw(). Listing 10 10 shows the code for the AbstractRenderer:

One way to get a quick snapshot of the Android Platform is to look at the structure of Java packages. Because Android deviates from the standard JDK distribution, it is important to know at a high level what is supported and what is not. Here s a brief description of the important Java packages that are included in the Android SDK: android.app: Implements the Application model for Android. Primary classes include Application, representing the start and stop semantics, as well as a number of activityrelated classes, controls, dialogs, alerts, and notifications. android.appwidget: Implements the mechanism for allowing applications to publish their views in other applications, such as the home page. The primary classes include AppWidgetHost, AppWidgetHostView, AppWidgetManager, AppWidgetProvider, and AppWidgetProviderInfo. This package is available only in SDK 1.5. android.content: Implements the concepts of content providers. Content providers abstract out data access from data stores. This package also implements the central ideas around intents and Android Uniform Resource Identifiers (URIs). android.content.pm: Implements Package Manager related classes. A package manager knows about permissions, installed packages, installed providers, installed services, installed components such as activities, and installed applications. android.content.res: Provides access to resource files both structured and unstructured. The primary classes are AssetManager (for unstructured resources) and Resources.

# let b x y = match x with 0 -> (let q = x in match y with 0 -> 1 | _ -> q) | 1 -> y | _ -> x * y;; val b : int -> int -> int = <fun> # b 0 3;; - : int = 0 # b 0 0;; - : int = 1 #

Listing 10 10. The AbstractRenderer //filename: AbstractRenderer.java public abstract class AbstractRenderer implements GLSurfaceView.Renderer { public void onSurfaceCreated(GL10 gl, EGLConfig eglConfig) { gl.glDisable(GL10.GL_DITHER); gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST); gl.glClearColor(.5f, .5f, .5f, 1); gl.glShadeModel(GL10.GL_SMOOTH); gl.glEnable(GL10.GL_DEPTH_TEST); } public void onSurfaceChanged(GL10 gl, int w, int h) { gl.glViewport(0, 0, w, h); float ratio = (float) w / h; gl.glMatrixMode(GL10.GL_PROJECTION); gl.glLoadIdentity(); gl.glFrustumf(-ratio, ratio, -1, 1, 3, 7); } public void onDrawFrame(GL10 gl) { gl.glDisable(GL10.GL_DITHER); gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glLoadIdentity(); GLU.gluLookAt(gl, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); draw(gl); } protected abstract void draw(GL10 gl); }

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