AndroidStudio 管理多个c++子项目编译出多个so库

AndroidStudio 合作开发的时候，管理多个库，编译多个so库的情况，其中jniLibs.armeabi-v7a是编译出的库文件目录，例如

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)

#set(CMAKE_CXX_FLAGS "-Wno-error=format-security -Wno-error=pointer-sign")

set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/jniLibs/${ANDROID_ABI})

#设置头文件搜索路径（和此txt同个路径的头文件无需设置），可选
#INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR}/common)

#指定用到的系统库或者NDK库或者第三方库的搜索路径，可选。
#link_DIRECTORIES(/usr/local/lib)

#添加子目录，将自动找到子目录中的CMakeLists.txt
ADD_SUBDIRECTORY(${PROJECT_SOURCE_DIR}/jsoncpp)
ADD_SUBDIRECTORY(${PROJECT_SOURCE_DIR}/websocketclient)
ADD_SUBDIRECTORY(${PROJECT_SOURCE_DIR}/janusclientsdk)

CMakeLists内容：

#继承上一层的CMakeLists.txt的变量，也可以在这里重新赋值
#C 的编译选项是 CMAKE_C_FLAGS
# 指定编译参数，可选
#SET(CMAKE_CXX_FLAGS "-Wno-error=format-security -Wno-error=pointer-sign")

#生成动态库名称、类型、资源文件
add_library(janusclientsdk SHARED janusclientsdk.cpp)
#依赖库
find_library(log-lib log)
#
target_link_libraries(janusclientsdk ${log-lib})

apply plugin: 'com.android.application'
def LIBWEBRTC_HOME_PATH = "I:/webrtc/android/webrtc_m84_20201001/webrtc_android/src/"
//def LIBWEBRTC_HOME_PATH = "I:/webrtc/android/androidnativeapi/app/webrtc/"
android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "org.webrtc.examples.androidnativeapi"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                arguments "-DLIBWEBRTC_HOME_PATH=" + LIBWEBRTC_HOME_PATH,
                        "-DANDROID_STL=c++_static"
            }
        }
        ndk {
            abiFilters  "armeabi-v7a"
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    sourceSets {
        main {
            // 1. 配置在根目录libs下可以加载第三方so库, (最好不要创建jniLibs, 在众多的开源库中可能会引起冲突,还没发现)
            // 2. 运行时会自动将libs目录下的so库拷贝到指定目录
            // 3. 如果自己创建的so不需要重新编译,可以将(app/build/intermediates/transforms)生成的so拷贝到这个目录
            jniLibs.srcDirs = ['libs']
            // 如果是单个文件夹 可以直接这样如下配置
            // jniLibs.srcDir 'libs'
        }
    }
    buildToolsVersion '28.0.2'//新增
}
repositories {
    flatDir{
        dirs'libs'
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.aar"])

    //implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    //implementation(name: 'libwebrtc', ext: 'aar')
    //implementation 'org.webrtc:google-webrtc:1.0.+'
}

五、结果