Confused how to get nativ cpp code in my project

[RozinaDarediya]

Hi @jhansireddy Thank you for awesome code. First of all its not an issue its my unawareness. I am a fresher in Android Development. And using your AndroidScannerDemo project to explore openCv. Your code is awesome But I want to add more color to set in Bitmap. As you have used nativ code( if I am not wrong). I am not able to add more functions like - ` public native Bitmap getScannedBitmap(Bitmap bitmap, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4);

public native Bitmap getGrayBitmap(Bitmap bitmap);

public native Bitmap getMagicColorBitmap(Bitmap bitmap);

public native Bitmap getBWBitmap(Bitmap bitmap);

public native float[] getPoints(Bitmap bitmap);`

Please guide me how to access these functions so I can make more similar functionality.

And also I am not able to use functions from openCV sdk like Mat Described in the - http://www.discoversdk.com/blog/opencv-with-android-studio Like - `Bitmap img = BitmapFactory.decodeResource(getResources(),R.drawable.pen); Mat source = new Mat(); Mat dest = new Mat(); Utils. bitmapToMat( img, source);

Imgproc. cvtColor(source, dest, Imgproc.COLOR_RGB2GRAY); Bitmap btmp = Bitmap.createBitmap(dest.width(),dest.height(),Bitmap.Config.ARGB_8888); Utils. matToBitmap(dest,btmp); imageView1. setImageBitmap (btmp);`

Please correct me if I am going wrong any where. Please guide me for this. Thank you Hope I will heard very soon from you. Sorry if you find difficult to understand my question as I am very confused. Thanks

[RozinaDarediya]

@jhansireddy
I am successfully able to build the project. But i am really confused how to change colours in cvtColor(mbgra, dst, CV_BGR2GRAY); if i am changing it to CV_GRAY2BGR565 it gives error as below OpenCV Error: Assertion failed (scn == 3 || scn == 4) in void cv::cvtColor(cv::InputArray, cv::OutputArray, int, int)

It will be very helpful if you give me any hint or link to solve my this question.

Thank you If anyone has the answer please answer.