BarcodeScannerZXing.java

public class BarcodeScannerZXing implements BarcodeScannerService {
    // RGBLuminanceSource of ZXing approximates luminance for faster barcode detection but can
    // yield to different results in comparison with a Bitmap representation of the image
    private 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);
        }
    }
    
      public Result getBarcodeFromBitmap(Bitmap bitmap) {
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();
        int[] pixels = new int[w * h];
        byte[] yuv = new byte[w * h];
        bitmap.getPixels(pixels, 0, w, 0, 0, w, h);
        populateYUVLuminanceFromRGB(pixels, yuv, w, h);
        PlanarYUVLuminanceSource source = new PlanarYUVLuminanceSource(yuv, w, h, 0, 0, w, h, false);
        Result rawResult = null;
        BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(source));
        try {
            rawResult = mMultiFormatReader.decodeWithState(binaryBitmap);
        } catch (ReaderException | NullPointerException | ArrayIndexOutOfBoundsException re) {
            // continue
        } finally {
            mMultiFormatReader.reset();
        }

        if (rawResult == null) return null;
        return rawResult;
    }
}