cocos2d-x 3.1 android 平台 响应返回键 疑问？

Question

下边的代码是正确的：

auto listener = EventListenerKeyboard::create();
listener->onKeyReleased = CC_CALLBACK_2(WelcomeScene::onKeyReleased, this);

_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

但是下边的确是无效的：

EventListenerKeyboard* listener = EventListenerKeyboard::create();
listener->onKeyReleased = CC_CALLBACK_2(WelcomeScene::onKeyReleased, this);


_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

请问下  这是为什么啊？

Answer 1

你的也是3.1吗？

Answer 2

// 初始化并绑定

//auto kblsnr = EventListenerKeyboard::create();

EventListenerKeyboard* kblsnr = EventListenerKeyboard::create();

kblsnr->onKeyReleased = CC_CALLBACK_2(LayerGame::onKeyReleased, this);

Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(kblsnr, this);

我试了一下，没有问题。无论是不是auto都ok

Answer 3

可是3.0版本开始就有这个了，网上好多源码包括官方test工程都是用这个。。