Question

当我在cocos2d中运行我的应用程序时，它会输出错误：

2> Creating library C:\Users\Will\Documents\Projects\Home\proj.win32\Debug.win32\Home.lib and object C:\Users\Will\Documents\Projects\Home\proj.win32\Debug.win32\Home.exp 2>AppDelegate.obj : error LNK2001: unresolved external symbol "void * firebase::g_admob_initializer" (?g_admob_initializer@firebase@@3PAXA) 2>C:\Users\Will\Documents\Projects\Home\proj.win32\Debug.win32\Home.exe : fatal error LNK1120: 1 unresolved externals ========== Build: 1 succeeded, 1 failed, 4 up-to-date, 0 skipped ==========

我不知道为什么。我的应用程序实际上是默认的cocos2d应用程序，添加了firebase教程中的信息。我所做的就是包括firebase\admob.h，它会导致错误。当我因某种原因包含firebase\app.h时，它不会导致错误。

cocos2d verison：3.15.1

NDK：v15

SDK：26.0.0

它说未解析的外部符号，所以我猜测它与链接有关，但在我的Android.mk中，我链接它。

app\jni\Android.mk

LOCAL_PATH := $(call my-dir)

# The path to the Firebase C++ SDK, in the project's root directory.
FIREBASE_CPP_SDK_DIR := ../../../firebase_cpp_sdk

APP_ABI := armeabi-v7a x86
STL := $(firstword $(subst _, ,$(APP_STL)))
FIREBASE_LIBRARY_PATH := $(FIREBASE_CPP_SDK_DIR)/libs/android/$(TARGET_ARCH_ABI)/$(STL)

include $(CLEAR_VARS)
LOCAL_MODULE := firebase_app
LOCAL_SRC_FILES := $(FIREBASE_LIBRARY_PATH)/libapp.a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FIREBASE_CPP_SDK_DIR)/include
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := firebase_admob
LOCAL_SRC_FILES := $(FIREBASE_LIBRARY_PATH)/libadmob.a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/$(FIREBASE_CPP_SDK_DIR)/include
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

$(call import-add-path,$(LOCAL_PATH)/../../../cocos2d)
$(call import-add-path,$(LOCAL_PATH)/../../../cocos2d/external)
$(call import-add-path,$(LOCAL_PATH)/../../../cocos2d/cocos)
$(call import-add-path,$(LOCAL_PATH)/../../../cocos2d/cocos/audio/include)

LOCAL_MODULE := MyGame_shared
LOCAL_MODULE_FILENAME := libMyGame

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

LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../../Classes

# _COCOS_HEADER_ANDROID_BEGIN
# _COCOS_HEADER_ANDROID_END

LOCAL_STATIC_LIBRARIES := cocos2dx_static
LOCAL_STATIC_LIBRARIES += firebase_app
LOCAL_STATIC_LIBRARIES += firebase_admob

# _COCOS_LIB_ANDROID_BEGIN
# _COCOS_LIB_ANDROID_END

include $(BUILD_SHARED_LIBRARY)

$(call import-module,.)

# _COCOS_LIB_IMPORT_ANDROID_BEGIN
# _COCOS_LIB_IMPORT_ANDROID_END

build.gradle

import org.apache.tools.ant.taskdefs.condition.Os

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "25.0.0"

    defaultConfig {
        applicationId "com.call.home"
        minSdkVersion 14
        targetSdkVersion PROP_TARGET_SDK_VERSION
        versionCode 1
        versionName "1.0"

        externalNativeBuild {
            ndkBuild {
                if (!project.hasProperty("PROP_NDK_MODE") || PROP_NDK_MODE.compareTo('none') != 0) {
                    // skip the NDK Build step if PROP_NDK_MODE is none
                    targets 'MyGame'
                    arguments 'NDK_TOOLCHAIN_VERSION=4.9'
                    arguments 'APP_PLATFORM=android-'+PROP_TARGET_SDK_VERSION

                    def module_paths = [project.file("../../cocos2d").absolutePath,
                                        project.file("../../cocos2d/cocos").absolutePath,
                                        project.file("../../cocos2d/external").absolutePath]
                    if (Os.isFamily(Os.FAMILY_WINDOWS)) {
                        // should use '/'
                        module_paths = module_paths.collect {it.replaceAll('\\\\', '/')}
                        arguments 'NDK_MODULE_PATH=' + module_paths.join(";")
                    }
                    else {
                        arguments 'NDK_MODULE_PATH=' + module_paths.join(':')
                    }

                    arguments '-j' + Runtime.runtime.availableProcessors()
                    abiFilters.addAll(PROP_APP_ABI.split(':').collect{it as String})
                }
            }
        }
    }

    sourceSets.main {
        java.srcDir "src"
        res.srcDir "res"
        manifest.srcFile "AndroidManifest.xml"
        assets.srcDir "../../Resources"
    }

    externalNativeBuild {
        ndkBuild {
            if (!project.hasProperty("PROP_NDK_MODE") || PROP_NDK_MODE.compareTo('none') != 0) {
                // skip the NDK Build step if PROP_NDK_MODE is none
                path "jni/Android.mk"
            }
        }
    }

    signingConfigs {

       release {
            if (project.hasProperty("RELEASE_STORE_FILE")) {
                storeFile file(RELEASE_STORE_FILE)
                storePassword RELEASE_STORE_PASSWORD
                keyAlias RELEASE_KEY_ALIAS
                keyPassword RELEASE_KEY_PASSWORD
            }
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            if (project.hasProperty("RELEASE_STORE_FILE")) {
                signingConfig signingConfigs.release
            }

            externalNativeBuild {
                ndkBuild {
                    arguments 'NDK_DEBUG=0'
                }
            }
        }

        debug {
            externalNativeBuild {
                ndkBuild {
                    arguments 'NDK_DEBUG=1'
                }
            }
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile project(':libcocos2dx')
    compile 'com.google.firebase:firebase-ads:11.4.0'
}

apply plugin: 'com.google.gms.google-services'

请注意，这仅适用于Visual Studio。在命令提示符或Android Studio中编译它不会产生此问题。

另请注意，当我删除显示FIREBASE_APP_REGISTER_CALLBACKS_REFERENCE(admob)的行时从admob.h文件，它的工作原理。但是，我担心它会搞砸一些事情，所以我会坚持这个解决方案。

Answer 1

这是未将Firebase库添加到项目中时导致的错误。您应该通过右键单击您的项目进行验证，然后导航到

属性/配置属性/链接器/输入/其他依赖项

，并确保您具有（-d调试前缀）：firebase_admob-d.lib 以及它依赖的任何其他firebase _ ***-d.lib。

Firebase未解析的外部符号

1 个答案: