Cocos2d-x3.3RC0通过JNI实现Java与C++互调

struct _JNIEnv {
/* do not rename this; it does not seem to be entirely opaque */
const struct JNINativeInterface* functions;

#if defined(__cplusplus)

jint GetVersion()
{ return functions->GetVersion(this); }

jclass DefineClass(const char *name,jobject loader,const jbyte* buf,jsize bufLen)
{ return functions->DefineClass(this,name,loader,buf,bufLen); }

jclass FindClass(const char* name)
{ return functions->FindClass(this,name); }
// 这里省略其他函数...

}

JniMethodInfo info;  
bool ret = JniHelper::getStaticMethodInfo(info,"org/cocos2dx/cpp/AppActivity","getObj","()Ljava/lang/Object;");  
jobject jobj;  
if(ret)  
{  
    log("call void getObj() succeed");  
    jobj = info.env->CallStaticObjectMethod(info.classID,info.methodID);  
}  
  
bool re = JniHelper::getMethodInfo(info,"func1","()V");  
if(re)  
{  
    log("call func1 succeed");  
    info.env->CallVoidMethod(jobj,info.methodID);  
}  

2、getMethodInfo：用于调用Java类的非静态函数

#if(CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)  
    JniMethodInfo info;  
    //判断org/cocos2dx/cpp/AppActivity.java中是否存在getObj静态函数  
    bool ret = JniHelper::getStaticMethodInfo(info,"()Ljava/lang/Object;");  
    jobject jobj;//用于存放返回的对象  
    if(ret)  
    {  
        log("call void getObj() succeed");  
        jobj = info.env->CallStaticObjectMethod(info.classID,info.methodID);//调用getObj函数，返回一个对象  
    }  
    //判断org/cocos2dx/cpp/AppActivity.java中是否存在func1非静态函数  
    bool re = JniHelper::getMethodInfo(info,"()V");  
    if(re)  
    {  
        log("call func1 succeed");  
        info.env->CallVoidMethod(jobj,info.methodID);//通过返回的对象调用非静态函数  
    }  
      
#endif  

3、类型签名

#ifndef __JniDemo__JniTest__
#define __JniDemo__JniTest__

#include "cocos2d.h"
USING_NS_CC;
//定义两个C++方法，在Jni的test.h中被Java方法调用。

//该方法被Java_org_cocos2dx_cpp_JniTestHelper_setPackageName调用
//定义org/cocos2dx/cpp/JniTestHelper类中的setPackageName方法
void setPackageName(const char* packageName)
{
    log("packageName = %s",packageName);
}
//该方法被Java_org_cocos2dx_cpp_JniTestHelper_exitApp调用
//定义org/cocos2dx/cpp/JniTestHelper类中得exitApp函数
void exitApp()
{
    Director::getInstance()->end();
}

#endif /* defined(__JniDemo__JniTest__) */

#include "test.h"
#include "cocos2d.h"
#include "platform/android/jni/JniHelper.h"
#include "../../../Classes/JniTest.h"
#include <jni.h>

#define CLASS_NAME "org/cocos2dx/cpp/JniTestHelper"
using namespace cocos2d;
extern "C"
{
	//C++调Java的函数，在HelloWorldScene中的menuCallback函数中调用。
	void showTipDialog(const char* title,jobject thiz)
	{
		exitApp();//此处调用的时Class目录中JniTest类中的函数。
	}
}

package org.cocos2dx.cpp;

import org.cocos2dx.lib.Cocos2dxActivity;
import org.cocos2dx.lib.Cocos2dxGLSurfaceView;
import org.cocos2dx.lib.Cocos2dxHandler.DialogMessage;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

public class AppActivity extends Cocos2dxActivity{
	public static final int SHOW_DIALOG = 0x0001;
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		JniTestHelper.init(mHandler);
		//调用JniTestHelper的setPackageName函数，setPackageName函数在test.cpp中定义，最终调用C++层的setPackageName方法
		JniTestHelper.setPackageName(this.getPackageName());
	}
	
	public Cocos2dxGLSurfaceView onCreateView(){
		Cocos2dxGLSurfaceView glSurfaceView = new Cocos2dxGLSurfaceView(this);
		glSurfaceView.setEGLConfigChooser(5,6,5,16,8);
		return glSurfaceView;
	}
	static {
		System.loadLibrary("cocos2dcpp");
	}
	
	private Handler mHandler = new Handler()
	{
		public void handleMessage(Message msg) {
			
			switch (msg.what)
			{
			case SHOW_DIALOG:
				DialogMessage dm = (DialogMessage)msg.obj;
				new AlertDialog.Builder(AppActivity.this)
				.setTitle(dm.titile)
				.setMessage(dm.message).setNegativeButton("cancle",new DialogInterface.OnClickListener() {
					
					@Override
					public void onClick(DialogInterface arg0,int arg1) {
						// TODO Auto-generated method stub
						arg0.dismiss();
					}
				})
				.setPositiveButton("Ok",new DialogInterface.OnClickListener(){
					public void onClick(DialogInterface arg0,int arg1) {
						arg0.dismiss();
						JniTestHelper.exitApp();//调用JniTestHelper的exitApp函数，exitApp函数在test.cpp中定义，最终调用C++层的exitApp方法
					}
				})
				.create().show();
				break;
			}
		}
	};
}

6、工程总目录

三、编译运行

说了这么多，没有源码那不是坑爹么。源码连接：http://pan.baidu.com/s/1jGn80QE