cocos2d-x 把资源文件保存到本地手机上，调用JNI接口，ANdroid的

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1，创建一个类，来管理jni ，   NTJniHelper类

/********************************************************************

 *    文件描述:    jni管理者

 *********************************************************************/

#ifndef _H_NTJNIHELPER_H_

#define _H_NTJNIHELPER_H_

#include "cocos2d.h"

class NTRenameDelegate {

public:
virtual void registerMyName(std::string strName) = 0;

};

class NTJniHelper {

    

public:
static NTJniHelper* sharedJniHelper();
static void purgeSharedJniHelper();

    

public: // jni相关

void copyPNG();

    

private:
bool init();
static NTJniHelper
4000
* m_pShare;
CC_SYNTHESIZE(NTRenameDelegate*,m_pRenameDelegate,RenameDelegate);

    

};

#endif // _H_NTJNIHELPER_H_

===========================

/*******************************************************************

 *    文件描述:    jni 管理者

 *********************************************************************/

#include "NTJniHelper.h"

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)

#include "../proj.android/jni/hellocpp/NTJni.h"

#include "platform/android/jni/JniHelper.h"

#endif

USING_NS_CC;

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)

#include <jni.h>

extern "C" {
void Java_com_nt_common_NTJniHelper_toRegisterName(JNIEnv *env, jobject thiz, jstring strName) {
const char *pkgName = env->GetStringUTFChars(strName, NULL);

        
NTJniHelper::sharedJniHelper()->toRegisterName(pkgName);

        
env->ReleaseStringUTFChars(strName,pkgName);
}

}

#endif

NTJniHelper* NTJniHelper::m_pShare = NULL;

NTJniHelper* NTJniHelper::sharedJniHelper() {

    if (m_pShare == NULL) {

        m_pShare = new NTJniHelper();

        if (!m_pShare || !m_pShare->init()) {

            CC_SAFE_DELETE(m_pShare);

        }

    }

    return m_pShare;

}

bool NTJniHelper::init() {

    bool bRet = false;

    do {

        m_pRenameDelegate = NULL;

        bRet = true;

    } while (0);

    

    return bRet;

}

void NTJniHelper::copyPNG()

{
CCLog("-----------Android-------------\n");  

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)

    copyPNGJni();   /*  调用的是#include "../proj.android/jni/hellocpp/NTJni.h"

*/

#endif

}

==============================================

/********************************************************************

 

 *    文件描述:    JNI.h

 *********************************************************************/

#ifndef _H_NTJNI_H_

#define _H_NTJNI_H_

extern "C" {
void copyPNGJni();

}

#endif // _H_NTJNI_H_

/********************************************************************

 *    文件描述:  Jni app文件

 *********************************************************************/

#include "NTJni.h"

#include <jni.h>

#include "platform/android/jni/JniHelper.h"

#include "../../../Classes/NTJniHelper.h"

#define CLASS_NAME "com/nt/common/NTJniHelper"

#define ClassName_VIDEO "org/cocos2dx/common/PlayVideo"

 

USING_NS_CC;

extern "C" {

void copyPNGJni()
{
JniMethodInfo minfo;
if(JniHelper::getStaticMethodInfo(minfo, CLASS_NAME, "copyPNG", "()V")) {

minfo.env->CallStaticVoidMethod(minfo.classID, minfo.methodID);
}
}

}

/*这里调用了  CLASS_NAME,  中的"copyPNG",函数*/

在copyPNG函数中写方法

public static void copyPNG(){
System.out.print("copyPngs");

   String filename = "youhuijuan.png";//写res下的文件名字路径
   String newFileName = "/sdcard/helloworld.png";//保存到sd卡根目录下的图片及名字
   File dir = new File(newFileName);
       if (dir.exists())
       {
       
return;
       }
       
       AssetManager assetManager = ntparkure.getAssets();
   
   InputStream in = null;
   OutputStream out = null;
   try {
       in = assetManager.open(filename);
       
       out = new FileOutputStream(newFileName);
 
       byte[] buffer = new byte[1024];
       int read;
       while ((read = in.read(buffer)) != -1) {
           out.write(buffer, 0, read);
       }

       in.close();
       in = null;
       out.flush();
       out.close();
       out = null;
   } catch (Exception e) {
       Log.e("tag", e.getMessage());
   }
 
}

===完成运行，

注意：

  如果NTJni.cpp  不关闭的情况下eclipse会有很多错误@