Cocos2d-x3.1通过JniHelper调用Java类中静态函数

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
#include <jni.h>
#include "../../cocos2d/cocos/platform/android/jni/JniHelper.h" //这里的路径要根据你工程的实际情况进行更改
#include <android/log.h>

#if 1
#define  LOG_TAG    "JniHelper"
#define  LOGD(...)  __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
#else
#define  LOGD(...)
#endif

#endif

void HelloWorld::menuCloseCallback(Ref* pSender)
{
#if(CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
    JniMethodInfo info;
    //getStaticMethodInfo判断java定义的静态函数是否存在，返回bool
    bool ret = JniHelper::getStaticMethodInfo(info,"org/cocos2dx/cpp/TestJni","func1","()V");
    if(ret)
    {
        log("call void func1() succeed");
        //传入类ID和方法ID，小心方法名写错，第一个字母是大写
        info.env->CallStaticVoidMethod(info.classID,info.methodID);
    }
    
    ret = JniHelper::getStaticMethodInfo(info,"org/cocos2dx/cpp/TestJni","func2","()I");
    if(ret)
    {
        log("call int func2() succeed");
        jint iret = info.env->CallStaticIntMethod(info.classID,info.methodID);
        log("func2 return = %d",iret);
    }
    
    ret = JniHelper::getStaticMethodInfo(info,"org/cocos2dx/cpp/TestJni","func3","(I)Ljava/lang/String;");
    if(ret)
    {
        log("Call int func3(int) succeed");
        jobject jobj = info.env->CallStaticObjectMethod(info.classID,info.methodID,1438);
    }
    
    ret = JniHelper::getStaticMethodInfo(info,"org/cocos2dx/cpp/TestJni","func4","(Ljava/lang/String;)Ljava/lang/String;");
    if(ret)
    {
        log("call string func4(string) succeed");
        jobject para = info.env->NewStringUTF("haha");
        jstring jstr = (jstring)info.env->CallStaticObjectMethod(info.classID,info.methodID,para);
        std::string text = JniHelper::jstring2string(jstr);
        log("%s",text.c_str());
    }
    
    ret = JniHelper::getStaticMethodInfo(info,"org/cocos2dx/cpp/TestJni","func5","(II)I");
    if(ret)
    {
        log("call int func5(int a, int b) succeed");
        jint iret = info.env->CallStaticIntMethod(info.classID,info.methodID,1,2);
        log("return value is %d",iret);
    }
    
#endif
}

4、ADT中创建java新类

package org.cocos2dx.cpp;

import android.R.integer;
import android.util.Log;

public class TestJni {
	public static void func1()
	{
		Log.e("hello", "world");
	}
	
	public static int func2()
	{
		return 12345;
	}
	
	public static String func3(int i)
	{
		String str = "get int value:" + i;
		Log.e("yu", str);
		return str;
	}
	
	public static String func4(String str)
	{
		Log.e("func4", "str");
		return str;
	}
	
	public static int func5(int a,int b)
	{
		int c = a + b;
		Log.e("func5", "a+b");
		return c;
	}		
}

5、编译吧

6、至此，在Cocos2d-x工程中通过Jni调用java中的静态函数应该没问题了，如果有问题，百度就好了。下面是我程序的截图。