Decoding qr code from image stored on the phone with Zxing (on Android phone)

Question

I have an app that receives qr code from the server. I want to decode it (not with intent and camera) and display the text it contains in my app. I have alredy done this in Java SE with jars from zxing with this code:

 private class QRCodeDecoder {
         public String decode(File imageFile) {
         BufferedImage image;
         try {
         image = ImageIO.read(imageFile);
         } catch (IOException e1) {
         return "io outch";
         }

         // creating luminance source
         LuminanceSource lumSource = new BufferedImageLuminanceSource(image);
         BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(lumSource));

         // barcode decoding
         QRCodeReader reader = new QRCodeReader();

         Result result = null;
         try {
         result = reader.decode(bitmap);
         } catch (ReaderException e) {
         return "reader error";
         }

         return result.getText();

         }
        }

But on Android, BufferedImage is not found. Has anyone decoded qr code on android from image stored on the phone? Tnx.

Answer 1

In android,you can do it this way:

    @Override
    protected Result doInBackground(Void... params)
    {
        try
        {
            InputStream inputStream = activity.getContentResolver().openInputStream(uri);
            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
            if (bitmap == null)
            {
                Log.e(TAG, "uri is not a bitmap," + uri.toString());
                return null;
            }
            int width = bitmap.getWidth(), height = bitmap.getHeight();
            int[] pixels = new int[width * height];
            bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
            bitmap.recycle();
            bitmap = null;
            RGBLuminanceSource source = new RGBLuminanceSource(width, height, pixels);
            BinaryBitmap bBitmap = new BinaryBitmap(new HybridBinarizer(source));
            MultiFormatReader reader = new MultiFormatReader();
            try
            {
                Result result = reader.decode(bBitmap);
                return result;
            }
            catch (NotFoundException e)
            {
                Log.e(TAG, "decode exception", e);
                return null;
            }
        }
        catch (FileNotFoundException e)
        {
            Log.e(TAG, "can not open file" + uri.toString(), e);
            return null;
        }
    }

Answer 2

从谷歌代码下载ZXing，这个类文件： ZXing-1.6/zxing-1.6/androidtest/src/com/google/zxing/client/androidtest/RGBLuminanceSource.java可以帮到你。

Answer 3

Quickmark and qr droid actually reads out what the code says, and you can decode barcodes saved on your phone. Hit the menu button when your load the image and select share, find decode qr droid or decode quickmark, and the'll do the magic. I prefer quickmark for reading codes, because it tells me what is typed in the code.