android - cocos2d-x 未定义引用

Question

寻求一些帮助，我是 cocos2dx 的新手并且在使用 Eclipse IDE 时遇到错误。

在 HelloWorld.cpp 中我这样做:

_backgroundNode = CCParallaxNodeExtras::node();

它给了我如下 undefined reference 错误

对“CCParallaxNodeExtras::node()”的 undefined reference

我的CCParallaxNodeExtras.h头文件代码如下它继承了CCParallaxNode

using namespace cocos2d;
#include "cocos2d.h"

class CCParallaxNodeExtras : public cocos2d::CCParallaxNode {

    public :

    // Need to provide a constructor
    CCParallaxNodeExtras();

    // just to avoid ugly later cast and also for safety
    static CCParallaxNodeExtras* node();

    // Facility method (it’s expected to have it soon in COCOS2DX)
    void incrementOffset(CCPoint offset, CCNode* node);
};

#endif

这里是 CCParallaxNodeExtras.cpp

#include "CCParallaxNodeExtras.h"
using namespace cocos2d;

// Hack to access CCPointObject (which is not a public class)
class CCPointObject  : cocos2d::CCObject {
    CC_SYNTHESIZE(cocos2d::CCPoint, m_tRatio, Ratio)
    CC_SYNTHESIZE(cocos2d::CCPoint, m_tOffset, Offset)
    CC_SYNTHESIZE(cocos2d::CCNode *, m_pChild, Child)   // weak ref
};

// Need to provide a constructor
CCParallaxNodeExtras::CCParallaxNodeExtras() {
    cocos2d::CCParallaxNode(); // call parent constructor
}

CCParallaxNodeExtras* CCParallaxNodeExtras::node() {
    return new CCParallaxNodeExtras::CCParallaxNode();
}

void CCParallaxNodeExtras::incrementOffset(cocos2d::CCPoint offset,CCNode *node){
    for( unsigned int i = 0; i < m_pParallaxArray->num; i++) {
        CCPointObject *point = (CCPointObject *)m_pParallaxArray->arr[i];
        CCNode *curNode = point->getChild();
        if( curNode->isEqual(node) ) {
            point->setOffset( ccpAdd(point->getOffset(), offset) );
            break;
        }
    }
}

请回复，我知道上面有很多代码，但我想知道我是否做错了什么。任何帮助或建议将不胜感激。谢谢!

问候，穆罕默德·塔希尔·阿什拉夫

Answer 1

必须将新cpp文件的引用添加到对应jni目录下的Android.mk中。

在我的例子中，“Android.mk”文件位于路径中:{PROJ_DIRECTORY}\proj.android\jni

编辑此文件，并添加对 CCParallaxNodeExtras cpp 的引用，如下所示:

在 LOCAL_SRC_FILES 部分，您当前拥有:

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp

现在包括 CCParallasNodeExtras.cpp 。它应该如下所示:

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp  \
                   ../../Classes/CCParallaxNodeExtras.cpp

这应该可以解决问题。构建并运行。