Returning Mat object from native code to java in OpenCV

Question

I have an OpenCV Android app. Most of its code is in Java but I have one function that is in C. The function gets a Mat object and returns a new one.

My question is

Answer 1

in C++

jlong funC(){
Mat *mat = new Mat();
//...
return (jlong)mat;
}

in java:

long = addr;// addr is return from c method funC()
Mat mat = new Mat(addr);

Attention: You must new Mat() in C,if you code is : Mat mat();mat object memory will be collect when funC() end.