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As shown in Figure 9 5, the application contains four buttons: two to control recording, and two to start and stop playback of the recorded content. Listing 9 5 shows the layout file and activity class for the UI.

The OpenGL-related changes in the Android 1.5 SDK are primarily aimed at providing a simplified interface to the OpenGL drawing capabilities. This simplification will make OpenGL a lot more approachable to beginning OpenGL programmers. We discussed this need in 10, and to address it, we designed an OpenGL test harness that exhibits the following characteristics: Hide how one needs to initialize and get an EGLContext Hide the complexities of drawing on a SurfaceView using a secondary thread Expose only the interfaces that are dedicated to the core OpenGL drawing APIs

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module type LOGGER = sig val outputs: (facility * (facility -> string -> unit)) list val default_log_level: facility val init: unit -> unit val shutdown: unit -> unit end Next is the very simple logger It just uses Printf for formatted output and doesn t include timestamps because formatting timestamps is somewhat difficult in OCaml You have defined only three elements in the outputs array module SimpleLogger:LOGGER = struct let strmesg x y = let n = string_of_facility x in Printfprintf "%s %s\n" n y;; let strerrmesg x y = let n = string_of_facility x in Printfeprintf "%s %s\n" n y;; let outputs = [ (Error,strmesg); (Warn,strmesg); (Info,strmesg); (Error,strerrmesg) ] let default_log_level = Info let init () = () let shutdown () = () end;; The default logger uses an external C function to do most of the actual work You are passing a Unix.

Listing 9 5. Media Recording and Playback in Android < xml version="1.0" encoding="utf-8" > <!-- This file is /res/layout/record.xml --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/bgnBtn" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Begin Recording"/>

<Button android:id="@+id/stpBtn" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Stop Recording"/> <Button android:id= "@+id/playRecordingBtn" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Play Recording"/> <Button android:id= "@+id/stpPlayingRecordingBtn" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Stop Playing Recording"/> </LinearLayout> // RecorderActivity.java import java.io.File; import android.app.Activity; import android.media.MediaPlayer; import android.media.MediaRecorder; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class RecorderActivity extends Activity { private MediaPlayer mediaPlayer; private MediaRecorder recorder; private static final String OUTPUT_FILE= "/sdcard/recordoutput.3gpp"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.record); Button startBtn = (Button) findViewById(R.id.bgnBtn); Button endBtn = (Button) findViewById(R.id.stpBtn); Button playRecordingBtn = (Button) findViewById(R.id.playRecordingBtn); Button stpPlayingRecordingBtn = (Button) findViewById(R.id.stpPlayingRecordingBtn); startBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { try { beginRecording(); } catch (Exception e) { e.printStackTrace(); } } }); endBtn.setOnClickListener(new OnClickListener() {

In that framework, you only needed to worry about inheriting from an AbstractRenderer to start drawing. The changes in the 1.5 SDK follow a similar pattern, introducing these key new classes and interfaces into the android.opengl package: GLSurfaceView: This class is responsible for drawing on a surface view using a secondary thread. It s equivalent to the OpenGLTestHarness and GLThread classes covered in 10. GLSurfaceView.Renderer: This is an interface that defines a contract for the inheriting drawing classes. All rendering subclasses need to implement this interface. With these classes and interfaces, you should use OpenGL like this: 1. Implement the Renderer interface and provide the necessary OpenGL setup such as the OpenGL camera. Then override the onDraw method to draw. 2. Instantiate a GLSurfaceView and associate it with the subclassed Renderer from step 1. 3. Set the GLSurfaceView object in the activity. You should familiarize yourself with the Renderer interface (see Listing 13-1) because it s the primary contract that developers will use to implement their drawing code. Listing 13-1. The 1.5 SDK 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); } As you might have noticed, this renderer resembles the Renderer interface that we introduced in 10 (see Listing 10-10). The methods in both interfaces have similar responsibilities, so we won t explain what each method does. By further following the test harness in 10, we can gain even more simplicity by having all our renderers inherit from an AbstractRenderer. This would let us factor out the code that is common to all renderers and place it in the AbstractRenderer. Let us implement this AbstractRenderer using the new standardized 1.5 SDK Renderer interface (see Listing 13-2).

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