Question

我试图将firebase c ++ sdk添加到我的cocos2d-x 3.14游戏中。到目前为止，我已经在firebase_cpp_sdk目录中创建了Android.mk：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := firebase-prebuilt
LOCAL_SRC_FILES := libs/android/$(TARGET_ARCH_ABI)/c++/libapp.a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_STATIC_LIBRARY)


include $(CLEAR_VARS)
LOCAL_MODULE := firebase-analytics
LOCAL_SRC_FILES := libs/android/$(TARGET_ARCH_ABI)/c++/libanalytics.a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_STATIC_LIBRARY)

然后在Android.mk的项目中，我添加了：

LOCAL_C_INCLUDES += /Users/piotr/Documents/pierdoly/firebase_cpp_sdk/include

LOCAL_STATIC_LIBRARIES += firebase-prebuilt firebase-analytics

$(call import-add-path, /Users/piotr/Documents/pierdoly/firebase_cpp_sdk)

我可以同步gradle和构建项目。我也可以

#include <firebase/app.h>

在AppDelegate.cpp（或h）中

，它工作正常。即使Android工作室也可以看到所有的firebase标题，我可以检查它们。

现在，在applicationDidFinishLaunching中我添加了这个：

#if (CC_TARGET_PLATFORM != CC_PLATFORM_ANDROID)
    ::firebase::App* app = ::firebase::App::Create(::firebase::AppOptions());
#else
    ::firebase::App* firebaseApp = ::firebase::App::Create(::firebase::AppOptions(), cocos2d::JniHelper::getEnv(), cocos2d::JniHelper::getActivity());
#endif

还有来自AppActivity.java的JNICALL的替代版本（传递正确的活动，因为有人说上面的解决方案不起作用）：

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JNIEXPORT void JNICALL Java_org_cocos2dx_cpp_AppActivity_initFirebase(JNIEnv* env, jobject thiz)
{
    ::firebase::App* app = ::firebase::App::Create(::firebase::AppOptions(), env, thiz);
}
#endif

然而我的问题是：它甚至无法编译。那里有链接器错误：

Error:(141) undefined reference to 'firebase::App::Create(firebase::AppOptions const&, _JNIEnv*, _jobject*)'

我可以清楚地＆＃34;去＆＃34;在Android Studio中使用此功能，我已经重新检查了两次我给出的参数。他们很好。然而，链接器对我大喊大叫。

如何修复链接器？我在这里缺少什么？

Answer 1

I had the same problem but found the answer:

It's about the order of the libraries being linked. You just have to rearrange it like this:

LOCAL_STATIC_LIBRARIES += firebase-analytics firebase-prebuilt

And it should work.

Say thanks to the guys in this github issue

Answer 2

Cocos使用不同的utils进行本机库构建，它可以是 cmake 或 ndk util，因此请检查您的frameworks / runtime-src / proj.android / gradle。属性选项 PROP_BUILD_TYPE ，然后将其是否需要从 cmake 更改为 ndk-build 然后在 frameworks / runtime-src / proj.android / app / build.gradle 上查看 build.gradle ，它必须正确使用 ndk-build

Android项目中的C ++ Firebase链接错误

2 个答案: