CMakeList配置JNI包含多个cpp文件

整合后结构：

项目结构

外层CMakeList文件配置：

#指定需要CMAKE的最小版本
cmake_minimum_required(VERSION 3.4.1)
#C的编译选项是 CMAKE_C_FLAGS
#指定编译参数，可选
SET(CMAKE_CXX_FLAGS "-Wno-error=format-security -Wno-error=pointer-sign")
#设置生成的so动态库最后输出的路径
#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/../jniLibs/${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)
#添加子目录,将会调用子目录中的CMakeLists.txt
ADD_SUBDIRECTORY(ffmpeg)

内层CMakeList文件配置：

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 )
find_library(android-lib android)

# 查找当前目录下的所有源文件，并保存到 DIR_LIB_SRCS 变量
aux_source_directory(. DIR_LIB_SRCS)

# 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.
# 根据c文件产生动态库
ADD_LIBRARY(native-lib SHARED ${DIR_LIB_SRCS})


set(JNI_LIBS_DIR ${CMAKE_SOURCE_DIR}/../jniLibs)

# 引入已编译的库
add_library(avutil
        SHARED
        IMPORTED )
set_target_properties(avutil
        PROPERTIES IMPORTED_LOCATION
        ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavutil.so )

add_library(swresample
        SHARED
        IMPORTED )
set_target_properties(swresample
        PROPERTIES IMPORTED_LOCATION
        ${JNI_LIBS_DIR}/${ANDROID_ABI}/libswresample.so )

add_library(swscale
        SHARED
        IMPORTED )
set_target_properties(swscale
        PROPERTIES IMPORTED_LOCATION
        ${JNI_LIBS_DIR}/${ANDROID_ABI}/libswscale.so )

add_library(avcodec
        SHARED
        IMPORTED )
set_target_properties(avcodec
        PROPERTIES IMPORTED_LOCATION
        ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavcodec.so )

add_library(avformat
        SHARED
        IMPORTED )
set_target_properties(avformat
        PROPERTIES IMPORTED_LOCATION
        ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavformat.so )

add_library(avfilter
        SHARED
        IMPORTED )
set_target_properties(avfilter
        PROPERTIES IMPORTED_LOCATION
        ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavfilter.so )

add_library(avdevice
        SHARED
        IMPORTED )
set_target_properties(avdevice
        PROPERTIES IMPORTED_LOCATION
        ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavdevice.so )


include_directories(${JNI_LIBS_DIR}/includes)


target_link_libraries( # Specifies the target library.
        native-lib
        avutil swresample swscale avcodec avformat avfilter avdevice
        # Links the target library to the log library
        # included in the NDK.
        ${log-lib} ${android-lib} )