QRCode reader using ZXing with Processing under Android (Ketai)

QRCodeAndroidTest.pde

import com.google.zxing.*;
import java.io.ByteArrayInputStream;
import javax.imageio.ImageIO;
import com.google.zxing.common.*;
import com.google.zxing.client.j2se.*;
import android.graphics.Bitmap;
import ketai.camera.*;

KetaiCamera cam;
boolean globalHistogram = false;
com.google.zxing.Reader reader = new com.google.zxing.MultiFormatReader();
void setup() {
  orientation(LANDSCAPE);
  imageMode(CENTER);
  cam = new KetaiCamera(this, 320, 240, 24);
}

void draw() {
  image(cam, width/2, height/2);
}
void populateYUVLuminanceFromRGB(int[] rgb, byte[] yuv420sp, int width, int height) {
  for (int i = 0; i < width * height; i++) {
    float red = (rgb[i] >> 16) & 0xff;
    float green = (rgb[i] >> 8) & 0xff;
    float blue = (rgb[i]) & 0xff;
    int luminance = (int) ((0.257f * red) + (0.504f * green) + (0.098f * blue) + 16);
    yuv420sp[i] = (byte) (0xff & luminance);
  }
}
void onCameraPreviewEvent()
{
  cam.read();
  Bitmap camBitmap = (Bitmap) cam.getNative();
  int w = camBitmap.getWidth();
  int h = camBitmap.getHeight();
  int[] rgb = new int[w * h];
  byte[] yuv = new byte[w * h];

  camBitmap.getPixels(rgb, 0, w, 0, 0, w, h);
  populateYUVLuminanceFromRGB(rgb, yuv, w, h);
  PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(yuv, w, h, 0, 0, w, h, false);
  BinaryBitmap bitmap;
  if (globalHistogram)
    bitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source)); 
  else

    bitmap = new BinaryBitmap(new HybridBinarizer(source)); 
  Result result = null;
  try {
    result = reader.decode(bitmap);
  } 
  catch (Exception e) {
  }
  //Once we get the results, we can do some display
  if (result != null &&
    result.getText() != null) { 
    println(result.getText());
  }
  //LuminanceSource source = new PlanarYUVLuminanceSource(, 0, 0, cam.width, cam.height, false);
}

// start/stop camera preview by tapping the screen
void mousePressed()
{
  if (cam.isStarted())
  {
    cam.stop();
  } else
    cam.start();
}
void keyPressed() {
  if (key == CODED) {
    if (keyCode == MENU) {
      if (cam.isFlashEnabled())
        cam.disableFlash();
      else
        cam.enableFlash();
    }
  }
}