Cocos2dx C++中调用java非静态函数。

CPP中调用JAVA中的非静态方法需要先获得Activity的对象，这是区别所在。

在AppActivity中声明一个静态变量

public static AppActivity con;

在AppActivity的create中对此变量进行赋值

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        con = this;
    }

在AppActivity中添加一个获得该对象的方法

public static Object returnActivity() {
        return con;
    }

在cpp中添加方法

void HelloWorld::onClickLogin()
{
#if(CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
    {
        JniMethodInfo info;
        jobject activityObj;

        bool isHaveObj = JniHelper::getStaticMethodInfo(info, "org/cocos2dx/cpp/AppActivity", "returnActivity", "()Ljava/lang/Object;");

        if (isHaveObj)
        {
            activityObj = info.env->CallStaticObjectMethod(info.classID, info.methodID);
            log("jni:obj has find.");
        }
        else
        {
            log("jni:obj is null");
        }

        JniMethodInfo methodInfo;
        bool isHaveMethod = JniHelper::getMethodInfo(methodInfo, "org/cocos2dx/cpp/AppActivity", "onClickLogin", "()V");
        if (isHaveMethod) 
        {
            methodInfo.env->CallVoidMethod(activityObj, methodInfo.methodID);
        }
    }
#endif
}