APP使用预编译库
默认路径
预编译库中的so放到src/main/jniLibs/<ABI>下，AndroidStudio打包时会自动将预编译的so文件打包进生成的产物APK/AAR里
.
├── build.gradle
└── src
├── main
│ ├── AndroidManifest.xml
│ ├── java
│ └── jniLibs
│ ├── arm64-v8a
│ │ └── libprebuilt.so
│ └── armeabi-v7a
│ └── libprebuilt.so
自定义路径
预编译库中的so放置到任意路径：
.
├── build.gradle
├── libs
│ ├── arm64-v8a
│ │ └── libprebuilt.so
│ └── armeabi-v7a
│ └── libprebuilt.so
└── src
├── main
│ ├── AndroidManifest.xml
│ └── java
配置如下：
android {
sourceSets {
main {
jniLibs.srcDirs 'libs'
}
}
}
NDK引用预编译库
NDK项目中也可以引用预编译库。
这里注意不要将预编译库放到src/main/jniLibs/<ABI>下，或者使用android.sourceSets.main.jniLibs.srcDirs来配置预编译库路径；而是在Android.md或CMakeLists.txt中配置
ndk-build
TODO
cmake
下面是一个简单项目：
.
├── mylib
│ ├── build.gradle
│ └── src
│ └── main
│ └── cpp
│ ├── CMakeLists.txt
│ ├── include
│ │ └── my_lib.h
│ └── my_lib.cpp
└── prebuilt
├── include
│ └── prebuilt.h
└── lib
├── arm64-v8a
│ └── libprebuilt.so
└── armeabi-v7a
└── libprebuilt.so
配置如下：
cmake_minimum_required(VERSION 3.10.2)
# prebuilt lib root dir
set(PREBUILT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../../../../prebuilt)
set(PREBUILT_LIB_DIR ${PREBUILT_DIR}/lib/${ANDROID_ABI})
# libprebuilt.so
add_library(prebuilt STATIC IMPORTED)
set_target_properties(prebuilt PROPERTIES IMPORTED_LOCATION
${PREBUILT_LIB_DIR}/libprebuilt.so)
# my_lib project
project("my_lib")
# add source files to my_lib project
add_library(
my_lib
SHARED
my_lib.cpp)
# hide symobols
set_target_properties(my_lib PROPERTIES CXX_VISIBILITY_PRESET hidden)
# find android log library
find_library(
log-lib
log)
# include dirs
target_include_directories(
my_lib
PRIVATE
${CMAKE_CURRENT_SOURCE_DIR}/include # include dir of my_lib
${PREBUILT_DIR}/include # include dir of prebuilt library
)
# link prebuilt library & android log library to my_lib
target_link_libraries(
my_lib
prebuilt
${log-lib})
如上，在my_lib项目中引入了libprebuilt.so库，在打包时libprebuilt.so会自动打包到生成的APK/AAR中
NDK禁止打包预编译库
譬如我们创建的Android library项目引用了三方库libprebuilt.so，但是我们希望在生成的产物中不包含libprebuilt.so文件，单独提供该文件或由接入方自己导入这个库文件，可以在打包时排除这个文件：
plugins {
id 'com.android.library'
}
android {
defaultConfig {
externalNativeBuild {
cmake {
cppFlags ''
}
}
}
externalNativeBuild {
cmake {
path file('src/main/cpp/CMakeLists.txt')
version '3.18.1'
}
}
packagingOptions {
jniLibs.excludes += '**/libprebuilt.so' // 打包时排除libprebuilt.so文件
}
}
