win0系统，android studio如何通过cmake安装opnecv

您可以按照以下步骤安装OpenCV：

1. 下载OpenCV的源代码并解压缩。

2. 打开Android Studio并创建一个新项目。

3. 在项目的build.gradle文件中添加以下代码：

externalNativeBuild {
    cmake {
        cppFlags ""
        arguments "-DANDROID_STL=c++_shared"
    }
}

4. 在app的build.gradle文件中添加以下代码：

android {
    defaultConfig {
        externalNativeBuild {
            cmake {
                cppFlags ""
            }
        }
    }

    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

5. 在项目的根目录下创建一个CMakeLists.txt文件，并添加以下代码：

cmake_minimum_required(VERSION 3.4.1)

add_library( # Sets the name of the library.
             native-lib

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             src/main/cpp/native-lib.cpp )

# OpenCV
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/main/cpp/include)
add_library(lib_opencv SHARED IMPORTED)
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI}/libopencv_java4.so)

# Links your native library against one or more other native libraries.
target_link_libraries( # Specifies the target library.
                       native-lib

                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib}

                       # OpenCV
                       lib_opencv )

6. 在src/main/cpp文件夹下创建一个native-lib.cpp文件，并添加以下代码：

#include <jni.h>
#include <string>

#include <opencv2/opencv.hpp>

using namespace cv;

extern "C" JNIEXPORT jstring JNICALL
Java_com_example_myapplication_MainActivity_stringFromJNI(
        JNIEnv* env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    return env->NewStringUTF(hello.c_str());
}

7. 在MainActivity.java文件中添加以下代码：

static {
    System.loadLibrary("native-lib");
    System.loadLibrary("opencv_java4");
}

8. 最后，您可以在MainActivity.java文件中调用OpenCV函数。

请注意，您需要将OpenCV库文件放在src/main/jniLibs文件夹中，并根据您的CPU架构选择正确的文件夹。