JNI C向Java返回对象数组

Java 代码：

package com.fansen.hellojni;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class MainActivity extends Activity {

    @SuppressLint("DefaultLocale")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        TextView  tv = new TextView(this);
        tv.setText( "Hello World!" );

        String str = null;

        DiskInfo[] infos = stringFromJNI();
        for (int i = 0; i < infos.length; i++) {
            String aByte = null;
            if (Integer.toHexString(infos[i].value).toUpperCase().length() == 1) {
                aByte = "0" + Integer.toHexString(infos[i].value).toUpperCase();
                Log.i("TAG", "infos[" + i + "].value: " + "0" + Integer.toHexString(infos[i].value).toUpperCase());
            }else {
                aByte = Integer.toHexString(infos[i].value).toUpperCase();
                Log.i("TAG", "infos[" + i + "].value: " + Integer.toHexString(infos[i].value).toUpperCase());
            }
            if (str == null) {
                str = aByte;
            }else {
                str = str + aByte;
            }
        }
        Log.i("TAG", "str: " + str);
        setContentView(tv);
    }

    public native DiskInfo[]  stringFromJNI();

    static {
        System.loadLibrary("hello-jni");
    }

}

class DiskInfo{
    public int data;
    public int value;
    public int number;
}

C代码：

#include <string.h>
#include <jni.h>

typedef struct{
    int data;
    int value;
    int number;
} DiskInfo;

jobjectArray  Java_com_fansen_hellojni_MainActivity_stringFromJNI( JNIEnv* env, jobject thiz )
{
    jclass clsDiskInfo = (*env)->FindClass(env, "com/fansen/hellojni/DiskInfo");
    jobjectArray infos = (*env)->NewObjectArray(env, 10, clsDiskInfo, NULL);

    jfieldID dataID = (*env)->GetFieldID(env, clsDiskInfo, "data", "I");
    jfieldID valueID = (*env)->GetFieldID(env, clsDiskInfo, "value", "I");
    jfieldID numberID = (*env)->GetFieldID(env, clsDiskInfo, "number", "I");
    jmethodID consID = (*env)->GetMethodID(env, clsDiskInfo, "<init>", "()V");

    unsigned char send[10] = {0xFF,0x1F,0x07,0x08,0x00,0x00,0x01,0x02};

    int sendcopy[10] = {0};
    int j;
    for(j = 0; j <= 8; j++){
        sendcopy[j] = send[j];
    }

    int i;
    jobject obj;
    for(i = 0; i < 10; i++){
        obj = (*env)->NewObject(env, clsDiskInfo, consID);
        (*env)->SetIntField(env, obj, dataID, (jint)i);
        (*env)->SetIntField(env, obj, valueID, (jint)sendcopy[i]);
        (*env)->SetIntField(env, obj, numberID, (jint)i);
        (*env)->SetObjectArrayElement(env, infos, i, obj);
    }
    return infos;
}