Generate a image of QRCode in Android Screen

Question

"I want to display the image on screen." After scanning the QR code I need to show that as image in my application how to go about it.

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I have tried this but not getting output

   BarcodeFormat barcodeFormat = BarcodeFormat.QR_CODE;
        int width0 = 500;
        int height0 = 500;

        int colorBack = 0xFF000000;
        int colorFront = 0xFFFFFFFF;

        QRCodeWriter writer = new QRCodeWriter();
        try
        {
            Hashtable<EncodeHintType, Object> hint = new Hashtable<EncodeHintType,Object>(2);
            hint.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            ByteMatrix bitMatrix = writer.encode(fName, barcodeFormat, width0, height0, hint);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();
            int[] pixels = new int[width * height];
            for (int y = 0; y < height; y++)
            {
                int offset = y * width;
                for (int x = 0; x < width; x++)
                {

                   // if (bitMatrix.get(x, y))
                        pixels[offset + x] = colorBack;
                    //else
                        //pixels[offset + x] = colorFront;
                }
            }

            Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
            ImageView imageview = (ImageView)findViewById(R.id.imageView1);
            imageview.setImageBitmap(bitmap);
        } catch (WriterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }