Android Studio 打包AAR和第三方静态库

宝剑锋从磨砺出，梅花香自苦寒来。这篇文章主要讲述Android Studio 打包AAR和第三方静态库相关的知识，希望能为你提供帮助。
需求现在有一个第三方库libstatic_add.a和对应的头文件static.h，要求封装一个Module，该Module依赖这个静态库，要求打包的Module包含该静态库。
方案创建android Studio Library Project创建Project时，记得添加"Include C++ Support"，如果没有安装CMake，LLDB和NDK的话，记得安装一下。
项目创建好后，包括以下目录和文件（部分目录或文件是后面添加的）：

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build.gradle配置针对app模块的build.gradle进行如下配置：

//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 27 defaultConfig { minSdkVersion 16 targetSdkVersion 27 versionCode 1 versionName "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=${add_static_lib}" cFlags \'-O3\', \'-fsigned-char\' // full optimization, char data type is signed cppFlags \'-fsigned-char\', "-I${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 false proguardFiles 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\' }

local.properties配置针对app模块的local.propertise进行如下配置：

## 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\\\\

CMakeLists.txt配置针对app模块下的src\\main\\cpp\\CMakeLists.txt配置如下：

cmake_minimum_required(VERSION 3.4.1)set( PATH_TO_ADD_STATIC_LIB CACHE STRING "" )message(${ANDROID_ABI})file(GLOB CPP_FILES "*.cpp")add_library( native-lib SHARED ${CPP_FILES} )include_directories(src/main/cpp) include_directories(${PATH_TO_ADD_STATIC_LIB})target_link_libraries( native-lib android OpenSLES ${PATH_TO_ADD_STATIC_LIB}/libstatic_add.a )

导出AAR导出的AAR所在路径为“app\\build\\outputs\\aar\\app-debug.aar”
可以将app-debug.aar改为app-debug.zip，使用压缩工具打开，可以看到如下：