Android(安卓)NDK系列三（Android(安卓)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

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