1.Library Module配置
1.新建Module并将id设置为
com.android.library
2.在build.gradle中android block内部添加prefab发布功能(此功能主要是生成CMake config文件供第三方通过find_package()函数直接导入使用)
buildFeatures {
prefabPublishing true
}
3.在build.gradle的android block中添加如下原生库信息(库名称以及库头文件)
prefab {
storkpostprocessor {
headers "src/main/cpp/include"
}
}
4.一个示例CMakeLists.txt文件
# Sets the minimum version of CMake required to build your native library.
# This ensures that a certain set of CMake features is available to
# your build.
cmake_minimum_required(VERSION 3.4.1)
#project(postprocessor-stork)
# Specifies a library name, specifies whether the library is STATIC or
# SHARED, and provides relative paths to the source code. You can
# define multiple libraries by adding multiple add_library() commands,
# and CMake builds them for you. When you build your app, Gradle
# automatically packages shared libraries with your APK.
find_package(OpenCV 4.8 REQUIRED java)
message("opencv_libraries name = ${OpenCV_LIBRARIES}")
add_library( # Specifies the name of the library.
storkpostprocessor
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
src/main/cpp/PostProcessor.cpp )
# Specifies a path to native header files.
include_directories(src/main/cpp/include/)
target_link_libraries(
storkpostprocessor
${OpenCV_LIBRARIES}
)
5.打包aar文件
Build菜单---Make Module 'Your Module Name'
构建的aar文件位于build---outputs
2.使用者
1.在build.gradle android block下添加如下代码
buildFeatures {
prefab true
}
2.添加aar依赖
将上面生成的aar文件放入lib文件夹下，同时在build.gradle的dependencies block下添加如下代码:
implementation fileTree(include: ['*.jar', '*.aar'], dir: 'libs')
此时，aar就会被当前模块依赖，但是要在本地c++代码中使用，还需要配置CMake，还记得我们上面说的CMake的config mode吗？
3.CMakeLists.txt中依赖aar中的原生库
find_package(YourLibraryProjectName REQUIRED CONFIG)
target_link_libraries( # Specifies the target library.
postprocessor
YourLibraryProjectName::YourLibraryName
# Links the target library to the log library
# included in the NDK.
${log-lib})
这里需要注意一下，YourLibraryProjectName是上面生成aar的工程名称，通常是module的名称，其次在下面链接代码的时候，格式是
module名称::lib名称
还有需要注意的点是：
在你提供的头文件接口给第三方使用之前，函数涉及的参数类型或返回类型，最好不要使用依赖库中的第三方类型，最好使用原始数据类型
