我在使用原生 OpenCv 3.0.0 和 Android Studio 2.2 时遇到问题，新的 ndk 支持即使用 CMAKE 构建脚本。以下是我收到的错误。我是否遗漏了我的 gradle 或 cmake 文件中的任何内容？请告诉我。

Error:FAILURE: Build failed with an exception.

• 出了什么问题: 任务“:app:externalNativeBuildDebug”执行失败。

  Build command failed. Error while executing 'C:\Users\User\AppData\Local\Android\sdk\cmake\3.6.3155560\bin\cmake.exe' with arguments {--build E:\OpenCvAndroid\OPecvTry2CSupport\app.externalNativeBuild\cmake\debug\mips64 --target native-lib} [1/1] Linking CXX shared library ..\obj\mips64\libnative-lib.so FAILED: cmd.exe /C "cd . && C:\Users\User\AppData\Local\Android\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe -target mips64el-none-linux-android -gcc-toolchain C:/Users/User/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64 --sysroot=C:/Users/User/AppData/Local/Android/sdk/ndk-bundle/platforms/android-21/arch-mips64 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -O0 -fno-limit-debug-info -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ..\obj\mips64\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -llog -lm "C:/Users/User/AppData/Local/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/mips64/libgnustl_static.a" && cd ." CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o: In function ~Mat': E:/OpenCVSdk/sdk/native/jni/include\opencv2/core/mat.hpp:278: undefined reference tocv::fastFree(void*)' CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o: In function cv::Mat::release()': E:/OpenCVSdk/sdk/native/jni/include\opencv2/core/mat.hpp:367: undefined reference tocv::Mat::deallocate()' clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation) ninja: build stopped: subcommand failed.

还有我的 Cmake.txt

 cmake_minimum_required(VERSION 3.4.1)
 add_library( native-lib
         SHARED
         src/main/cpp/native-lib.cpp )
include_directories(E\:\\OpenCVSdk\\sdk\\native\\jni\\include )
find_library( log-lib log )
target_link_libraries(native-lib ${log-lib} )

还有我的 Gradle 构建文件

 {    apply plugin: 'com.android.application'

 android {

compileSdkVersion 24
buildToolsVersion "24.0.2"
defaultConfig {
    applicationId "viki.opecvtry2csupport"
    minSdkVersion 16
    targetSdkVersion 24
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"



    externalNativeBuild {
        cmake {
            cppFlags ""

        }
    }
}

最佳答案

我通过将“lib_opencv”库添加到 target_link_libraries 解决了我的问题

target_link_libraries(
                   native-lib lib_opencv #Just add the lib_opencv
                   ${log-lib} )

别忘了 Link Gradle to your native library

我完整的 CMakeList.txt

cmake_minimum_required(VERSION 3.4.1)

add_library( native-lib
             SHARED
             src/main/cpp/native-lib.cpp )

find_library( log-lib
              log )

target_link_libraries(native-lib lib_opencv
                       ${log-lib} )

set(CMAKE_VERBOSE_MAKEFILE on)
add_library(lib_opencv SHARED IMPORTED)
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION /PROJECT_PATH/openCVLibrary320/src/main/jniLibs/${ANDROID_ABI}/libopencv_java3.so)

include_directories(/OpenCV-android-sdk/sdk/native/jni/include)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")

关于android - OpenCv 与 Android studio 2.2+ 使用带有 cmake 的新 gradle - 未定义引用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39677968/