//改为library
apply plugin: 'com.android.library'//读取local.properties里的配置属性add_static_lib.dir，该属性指明libstatic_add.a静态库所在目录
Properties properties = new Properties()
properties.load(project.rootProject.file('local.properties').newDataInputStream())
def add_static_lib = properties.getProperty('add_static_lib.dir')android {compileSdkVersion 27defaultConfig {minSdkVersion 16targetSdkVersion 27versionCode 1versionName "1.0"testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"//添加下面ndk {abiFilters 'armeabi-v7a'// these platforms cover 99% percent of all Android devices}externalNativeBuild {cmake {//添加下面arguments '-DANDROID_PLATFORM=android-14','-DANDROID_TOOLCHAIN=clang','-DANDROID_ARM_NEON=TRUE','-DANDROID_STL=gnustl_static',"-DPATH_TO_ADD_STATIC_LIB:STRING=${add_static_lib}"cFlags '-O3', '-fsigned-char' // full optimization, char data type is signedcppFlags '-fsigned-char', "-I${add_static_lib}"}}}//添加下面sourceSets {main {jniLibs.srcDirs = ['src/main/cpp']}}//添加下面externalNativeBuild {cmake {path 'src/main/cpp/CMakeLists.txt'}}//添加下面sourceSets.main {jni.srcDirs = []jniLibs.srcDir 'src/main/libs'}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'}}
}dependencies {implementation fileTree(dir: 'libs', include: ['*.jar'])implementation 'com.android.support:appcompat-v7:27.1.1'implementation 'com.android.support.constraint:constraint-layout:1.1.0'implementation 'com.android.support:design:27.1.1'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'
}

## This file must *NOT* be checked into Version Control Systems,
# as it contains information specific to your local configuration.
#
# Location of the SDK. This is only used by Gradle.
# For customization when using a Version Control System, please read the
# header note.
#Wed May 16 13:05:05 CST 2018
ndk.dir=D\:\\NanRi\\Android\\android-ndk-r16b
sdk.dir=C\:\\Users\\suning\\AppData\\Local\\Android\\Sdk//添加如下，指明libstatic_add.a静态库所在目录

add_static_lib.dir=D\:\\NanRi\\Android\\Android-Studio-Project\\ModuleProject\\app\\src\\main\\libs\\

cmake_minimum_required(VERSION 3.4.1)set(PATH_TO_ADD_STATIC_LIBCACHE STRING ""
)message(${ANDROID_ABI})file(GLOB CPP_FILES "*.cpp")add_library(native-libSHARED${CPP_FILES}
)include_directories(src/main/cpp)
include_directories(${PATH_TO_ADD_STATIC_LIB})target_link_libraries(native-libandroidOpenSLES${PATH_TO_ADD_STATIC_LIB}/libstatic_add.a
)