1、下载OpenCVMobile的文件,链接地址

2、OpenCV-android-sdk/sdk/native/libs/arm64-v8a/libopencv_java4.so拷贝处理放到libs里面

3、 OpenCV-android-sdk/sdk/native/jni/include 放到include文件夹下

4、Cmake修改

set(lib_DIR ${CMAKE_SOURCE_DIR}/libs)
add_library(libopencv_java SHARED IMPORTED)
set_target_properties(libopencv_java PROPERTIES IMPORTED_LOCATION ${lib_DIR}/${ANDROID_ABI}/libopencv_java4.so)

target_link_libraries(
        Demo
        libopencv_java
        android
        z
        ${log-lib}
        ${android-lib}
        jnigraphics)

5、build.gradle中加入对动态链接库的支持

    externalNativeBuild {
        cmake {
            cppFlags "-std=c++11 -fopenmp"
            abiFilters "arm64-v8a"// , "arm64-v8a" "armeabi-v7a"
            arguments "-DANDROID_STL=c++_shared"
        }

6、引用后即可使用

#include <opencv2/core.hpp>