Android NDK系列三（Android Studio cmke 编译多个个.so文件）
如果我们要在我们的项目中加载多个我们生成的.so库
System.loadLibrary("play_sound");
System.loadLibrary("native-lib");
这时候需要我们生成多个.so库；
我们对上一篇做一个升级，比如我在生成 play_sound 库的时候，也想生成 我自己的native-lib库；
这时候我们需要多个CmakeList.txt管理：
先看一下我的项目目录：
在cpp下面分别创建了 native_lib 和 play_sound 文件夹，用来区分两个生成的so， 每个子CmakeList.txt对应一个.so
看一下native_lib目录下的CmakeList.txt,基本和默认生成的一样：
# 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)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
native-lib.cpp
#./src/main/cpp/native-lib.cpp
)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
native-lib
# Links the target library to the log library
# included in the NDK.
${log-lib} )
再来看play_sound目录下的CmakeList.txt：
# 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)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
#*********************************************
include_directories(
../fmod_inc
)
set(distribution_DIR ${CMAKE_SOURCE_DIR}/libs)
#set(distribution_DIR ${CMAKE_SOURCE_DIR}/src/main/jniLibs)
#添加预编译库fmod
add_library(
fmod
SHARED
IMPORTED
)
set_target_properties(
fmod
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libfmod.so
)
#添加预编译库fmodL
add_library(
fmodL
SHARED
IMPORTED
)
set_target_properties(
fmodL
PROPERTIES IMPORTED_LOCATION
${distribution_DIR}/${ANDROID_ABI}/libfmodL.so
)
#添加目标库
add_library(
play_sound
SHARED
# src/main/cpp/play_sound.cpp
# src/main/cpp/common_platform.cpp
# src/main/cpp/common.cpp
play_sound.cpp
common.cpp
common_platform.cpp
)
#*********************************************
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
# 生成的目标库
play_sound
# Links the target library to the log library
# included in the NDK.
#依赖于库
fmod
fmodL
${log-lib} )
最后来看app目录下的CmakeList.txt, 这里将上面两个 文件引入进来，
# 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)
#设置生成的so动态库最后输出的路径
#设置后，在编译后，还是先在build/intermediates/cmake下生成.so，然后会拷贝一份放到下面的目录中
#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/./libs/${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)
ADD_SUBDIRECTORY(./src/main/cpp/native_lib)
ADD_SUBDIRECTORY(./src/main/cpp/play_sound)
当然，在app模块 build.gradle中指定的 CmakeList.txt 文件是app下面的CmakeList.txt；
编译项目，这时生成两个.so：
ok啦！
大家也可以参考
参考：https://blog.csdn.net/b2259909/article/details/58591898