QR code detection in Java (Android Studio)

edit

Thanks berak, so QRCodeDetector in java is half implemented, it´s so weird...Anyways, could be possible to implement that decode functionality by myself? Thanks and regards.

@berak, For 3.4 branch I have:

//
// C++:  String cv::QRCodeDetector::decode(Mat img, Mat points, Mat& straight_qrcode = Mat())
//

//javadoc: QRCodeDetector::decode(img, points, straight_qrcode)
public  String decode(Mat img, Mat points, Mat straight_qrcode)
{

    String retVal = decode_0(nativeObj, img.nativeObj, points.nativeObj, straight_qrcode.nativeObj);

    return retVal;
}

//javadoc: QRCodeDetector::decode(img, points)
public  String decode(Mat img, Mat points)
{

    String retVal = decode_1(nativeObj, img.nativeObj, points.nativeObj);

    return retVal;
}

Oh, that's looks like a lack of tests because in the master branch I got:

//
// C++:  string cv::QRCodeDetector::decode(Mat img, Mat points, Mat& straight_qrcode = Mat())
//

// Return type 'string' is not supported, skipping the function


//
// C++:  string cv::QRCodeDetector::detectAndDecode(Mat img, Mat& points = Mat(), Mat& straight_qrcode = Mat())
//

// Return type 'string' is not supported, skipping the function

yes, cv::String (3.4) vs. std::string (master)

(imho, in the long run, the java wrappers need to learn how to support std::string (again))

@berak, @Agus, Proposed a hot fix here: https://github.com/opencv/opencv/pull....

(imho, in the long run, the java wrappers need to learn how to support std::string (again))

@berak, +1

Thanks @berak@dkurt!

So, after all the changes made thanks to your proposal, can I use Detect and Decode functions on my Android project? Regards.

Check a test code from the PR. Method detectAndDecode returns a string from an image with QRCode.

Sorry @dkurt@berak, I´m totally lost.... I´m still in the 4.0.1 OpenCV version, so how to import those changes into my Android Studio project?

do this issue still persist on ver. 4.4.0? currently exploring the possibiliy of using opencv for android qr code scanner and could use some help from u guys some simple answer like yes or no wil be much appreciated