将整数参数从Java函数传递给JNI函数，以返回垃圾值？

Question

I am calling a JNI function with int values as parameters. I am sending width and height as 800 and 480. But when I try to print these values in the JNI function I am getting 1 and 0 instead of 800 and 480. Why I am getting wrong values in JNI?

My JNI function call is:

findSquare(sourceImage.getNativeObjAddr(),
                        imageTaken.getNativeObjAddr(), 1, width, height);

public native void findSquare(long matAddrRgba, long matAddrDescriptor,
        int draw, int width, int height);

And the JNI function is:

JNIEXPORT jint JNICALL 
Java_info_androidhive_androidcameraapi_CameraMainActivity_findSquare(
        JNIEnv*, jobject, jlong addrRgba, jlong addrDescriptor, jlong addrSrc,
        jlong addrDst, jint draw, jint width, jint height);

Answer 1

The android and native method signatures don't match.

Your Java native method should look like this:

// added addrSrc, addrDst which were missing.
public native void findSquare(long matAddrRgba, long matAddrDescriptor, 
                              long addrSrc, long addrDst, int draw, int width, 
                              int height);