How to create an object with JNI?

I need to implement some functions into an Android application using NDK and thus JNI.

Here's the C code, with my concerns, that I wrote:

#include <jni.h>
#include <stdio.h>

jobject
Java_com_example_ndktest_NDKTest_ImageRef(JNIEnv* env, jobject obj, jint width, jint height, jbyteArray myArray)
{
    jint i;
    jobject object;
    jmethodID constructor;
    jobject cls;
    cls = (*env)->FindClass(env, "com/example/ndktest/NDKTest/Point");

//what should put as the second parameter? Is my try correct, according to what
//you can find in .java file? I used this documentation: http://download.oracle.com/javase/6/docs/technotes/guides/jni/spec/functions.html#wp16027

    constructor = (*env)->GetMethodID(env, cls, "<init>", "void(V)");
//http://download.oracle.com/javase/6/docs/technotes/guides/jni/spec/functions.html#wp16660
//Again, is the last parameter ok?

    object = (*env)->NewObject(env, cls, constructor, 5, 6);
//I want to assign "5" and "6" to point.x and point.y respectively.
    return object;
}    

My problems are more or less explained inside the code. Maybe also: is the return type of the function (jobject) ok?

Now the NDKTest.java:

package com.example.ndktest;

import android.app.Activity;
import android.widget.TextView;
import android.os.Bundle;

public class NDKTest extends Activity {
    /** Called when the activity is first created. */
    public native Point ImageRef(int width, int height, byte[] myArray);
    public class Point
    {

        Point(int myx, int myy)
        {
            x = myx;
            y = myy;
        }

        int x;
        int y;
    }

    @Override
    public void onCreate(Bundle savedInstanceState)
    {

         super.onCreate(savedInstanceState);
         TextView tv = new TextView(this);
         byte[] anArray = new byte[3];
         for (byte i = 0; i < 3; i++)
             anArray[i] = i;
         Point point = ImageRef(2, 3, anArray);
         tv.setText(String.valueOf(point.x));
            setContentView(tv);     
    }



    static
    {
       System.loadLibrary("test");
    }
}

When I try to run the code, it doesn't work.