Exemple sur la prévisualisation de la caméra

Bonjour
Voici un exemple d'une classe sur la prévisualisation de la caméra sous Android :

public class VideoPreviewActivity extends Activity
implements SurfaceHolder.Callback {
private static final String LOG_TAG_VIDEO_PREVIEW = "VideoPreview";
private SurfaceView surfaceView1;
private SurfaceHolder surfaceHolder1;
private Camera camera;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
surfaceView1 = (SurfaceView)findViewById(R.id.surface_view);
surfaceHolder1 = surfaceView1.getHolder();
surfaceHolder1.addCallback(this);
surfaceHolder1.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
if (camera != null) {
camera.stopPreview();
Camera.Parameters p = this.camera.getParameters();
p.setPreviewSize(width, height);
this.camera.setParameters(p);
try {
this.camera.setPreviewDisplay(holder);
this.camera.startPreview();
} catch (IOException e) {
Log.e(LOG_TAG_VIDEO_PREVIEW,
"Erreur E/S lors du setPreviewDisplay sur l’objet Camera",
e);
}
}
}

public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
}

public void surfaceDestroyed(SurfaceHolder holder) {
if (camera != null) {
camera.stopPreview();
camera.release();
}
}
}