1.实现test.cpp，test.cpp中包含对c++ so库要使用方法的jni定义，比如

libpclient.so有个头文件webrtctest.h内容如下：int test();

test.cpp中对接口test()的jni定义如下：
 

#include <jni.h>
#include "webrtctest.h"  // 包含需要调用的头文件

extern "C" {

JNIEXPORT jint JNICALL
Java_com_example_mytest_MainActivity_test(JNIEnv *env, jobject /* this */) {
    // 调用 libpclient.a 中的 test() 函数
    return test();
}

} // extern "C"


2.实现cmakelists.txt,我实现的cmakelists.txt内容如下：

cmake_minimum_required(VERSION 3.18.1)

# 设置 C++ 标准为 C++20
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# 添加你的静态库目录
set(LIBS_DIR ${CMAKE_SOURCE_DIR}/jniLibs/arm64-v8a)
set(INHEAD_DIR ${CMAKE_SOURCE_DIR}/jniLibs)
add_definitions(
        -D__STDC_CONSTANT_MACROS
        -D__STDC_FORMAT_MACROS
        -D_FORTIFY_SOURCE=2
        -D_GNU_SOURCE
        -D_LIBCPP_HARDENING_MODE=_LIBCPP_HARDENING_MODE_EXTENSIVE
        -DANDROID
        -DHAVE_SYS_UIO_H
        -DANDROID_NDK_VERSION_ROLL=r25c_1
        -DCR_CLANG_REVISION=\"llvmorg-18-init-12422-g74cdb8e6-1\"
        -D_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS
        -D_LIBCXXABI_DISABLE_VISIBILITY_ANNOTATIONS
        -DCR_LIBCXX_REVISION=6cd38f6d30dda7bed3df08427db0b2a4e3fa9e47
        -DNDEBUG
        -DNVALGRIND
        -DDYNAMIC_ANNOTATIONS_ENABLED=0
        -DWEBRTC_ENABLE_PROTOBUF=1
        -DWEBRTC_STRICT_FIELD_TRIALS=0
        -DWEBRTC_INCLUDE_INTERNAL_AUDIO_DEVICE
        -DRTC_ENABLE_VP9
        -DRTC_DAV1D_IN_INTERNAL_DECODER_FACTORY
        -DWEBRTC_HAVE_SCTP
        -DWEBRTC_USE_H264
        -DWEBRTC_ENABLE_LIBEVENT
        -DWEBRTC_ARCH_ARM64
        -DWEBRTC_HAS_NEON
        -DWEBRTC_LIBRARY_IMPL
        -DWEBRTC_ENABLE_AVX2
        -DWEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS=0
        -DWEBRTC_POSIX
        -DWEBRTC_LINUX
        -DWEBRTC_ANDROID
        -DABSL_ALLOCATOR_NOTHROW=1
        -DGOOGLE_PROTOBUF_NO_RTTI
        -DGOOGLE_PROTOBUF_NO_STATIC_INITIALIZER
        -DGOOGLE_PROTOBUF_INTERNAL_DONATE_STEAL_INLINE=0
        -DHAVE_PTHREAD
)

# 添加头文件路径
include_directories(
        ${INHEAD_DIR}
        #${INHEAD_DIR}/include
        #${INHEAD_DIR}/include/third_party/abseil-cpp
        # ${INHEAD_DIR}/include/third_party
        #${INHEAD_DIR}/include/third_party/jsoncpp/source/include
        #${INHEAD_DIR}/include/third_party/jsoncpp/source/src/lib_json
        #${INHEAD_DIR}/include/third_party/libyuv/include
        #${INHEAD_DIR}/include/buildtools/third_party/libc++
        #${INHEAD_DIR}/include/third_party/protobuf/src
)
add_library(liblog SHARED IMPORTED)
set_target_properties(liblog PROPERTIES IMPORTED_LOCATION ${LIBS_DIR}/liblog.so)

add_library(libwebrtc STATIC IMPORTED)
set_target_properties(libwebrtc PROPERTIES IMPORTED_LOCATION ${LIBS_DIR}/libwebrtc.a)

add_library(pclient STATIC IMPORTED)
set_target_properties(pclient PROPERTIES IMPORTED_LOCATION ${LIBS_DIR}/libpclient.a)

# 链接静态库到你的本地库
add_library(
        testwebrtc
        SHARED
        test.cpp
)

# 将native-lib与静态库链接
target_link_libraries(
        testwebrtc
        log
        libwebrtc
        pclient
)

# 设置编译选项
target_compile_options(testwebrtc PRIVATE
        -Wall
        -fPIC
        # other options
        )

要生成的jni so库的名称为libtestwebrtc.so,依赖静态库libpclient.a与libwebrtc.a,主要用来进行接口测试
 

3.在build.gradle中添加ndk的目录与cmakelists.txt的目录，定义只编译arm64-v8a以及设置apk打包库的目录

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.0"

    defaultConfig {
        applicationId "com.example.mytest"
        minSdkVersion 29
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        ndkVersion "27.0.12077973"
        ndk {
            abiFilters 'arm64-v8a' // arm64-v8a、armeabi-v7a、x86_64、x86 中的一个或多个
        }

        sourceSets.main {
            jni.srcDirs = ['jniLibs'] //disable automatic ndk-build call
        }

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
            version "3.18.1"
            // other cmake configurations
        }
    }

}

4.在mainactivity加载jni库，声明jni方法，并调用
 

companion object {
    init {
        System.loadLibrary("testwebrtc")
    }
}

// 声明本地方法
external fun test(): Int