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Skin Color Detection Problem [opencv4android]

i want to make a skin color detection, then i search a simple example to do skin color detection, but i don't know why my code is cannot run properly : this example basic skin color detection :

int main(){
Mat src = imread("qq.jpg");
if (src.empty())
    return -1;
blur( src, src, Size(3,3) );
Mat hsv;
cvtColor(src, hsv, CV_BGR2HSV);
Mat bw;
inRange(hsv, Scalar(0, 10, 60), Scalar(20, 150, 255), bw);
imshow("src", src);
imshow("dst", bw);
return 0;}

then this my android java code :

for (Rect r : hand){
            Core.rectangle(mRgba,,, new Scalar(255, 255, 255, 255), 3);
            Mat roi = mRgba.submat(r);

            Imgproc.cvtColor(roi, roi, Imgproc.COLOR_BGR2HSV, 4);
            Imgproc.cvtColor(roi, roi, Imgproc.COLOR_RGB2RGBA, 4);

            Core.inRange(roi, new Scalar(0, 10, 60), new Scalar(20, 150, 255), roi);                            
            Mat rect_area = mRgba.rowRange(r.y, r.y+r.height).colRange(r.x, r.x+r.width);


any body help me... i need this for my final project, thanks