NDK开发模块的时候，如果涉及到网络请求，类似json数据传递的时候，有现成的第三方json库可以移植，后台C++开发中使用的比较多的是jsoncpp，今天记录一下jsoncpp移植到Android平台的过程

cmake编译

此方法并非标准的NDK项目
采用的是cmake交叉编译生成
jsoncpp地址
https://github.com/open-source-parsers/jsoncpp
先将源码克隆下来
新建文件夹libjson
将jsoncpp源码中的include文件夹复制到该目录，然后进入src/lib_json目录复制
部分文件到libjson目录下的src目录中，如下

json_reader.cpp

json_tool.h

json_value.cpp

json_valueiterator.inl

json_writer.cpp

version.h.in

 CMAKE_MINIMUM_REQUIRED(VERSION 3.5)

 PROJECT(Jpp)

 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

 #ARCHS集合

 SET(ARCHS "arm" "arm64" "x86" "x86_64" "mips" "mips64")

 #PLATFORM集合

 SET(PLATFORM "arm-linux-androideabi" "aarch64-linux-android" "i686-linux-android" "x86_64-linux-android" "mipsel-linux-android" "mips64el-linux-android")

 SET(JSONCPP_INCLUDE_DIR include)

 INCLUDE_DIRECTORIES(${JSONCPP_INCLUDE_DIR})

 SET(PUBLIC_HEADERS

     ${JSONCPP_INCLUDE_DIR}/json/config.h

     ${JSONCPP_INCLUDE_DIR}/json/forwards.h

     ${JSONCPP_INCLUDE_DIR}/json/features.h

     ${JSONCPP_INCLUDE_DIR}/json/value.h

     ${JSONCPP_INCLUDE_DIR}/json/reader.h

     ${JSONCPP_INCLUDE_DIR}/json/writer.h

     ${JSONCPP_INCLUDE_DIR}/json/assertions.h

     ${JSONCPP_INCLUDE_DIR}/json/version.h

     )

 SOURCE_GROUP("Public API" FILES ${PUBLIC_HEADERS})

 SET(jsoncpp_sources

                 src/json_tool.h

                 src/json_reader.cpp

                 src/json_valueiterator.inl

                 src/json_value.cpp

                 src/json_writer.cpp

                 src/version.h.in)

 #INDEX= "arm"

 #INDEX= "arm64"

 #INDEX= "x86"

 #INDEX= "x86_64"

 #INDEX= "mips"

 #INDEX= "mips64"

 SET(INDEX )

 list(GET ARCHS ${INDEX} TARGET_ARCH)

 list(GET PLATFORM ${INDEX} TARGET_PLATFORM)

 MESSAGE("ARCH= " ${TARGET_ARCH})

 MESSAGE("PLATFORM= " ${TARGET_PLATFORM})

 SET(CMAKE_C_COMPILER "$ENV{HOME}/android-toolchain/${TARGET_ARCH}/bin/${TARGET_PLATFORM}-gcc")

 SET(CMAKE_CXX_COMPILER "$ENV{HOME}/android-toolchain/${TARGET_ARCH}/bin/${TARGET_PLATFORM}-g++")

 SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)

 SET(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib)

 ADD_LIBRARY(${TARGET_ARCH}_share SHARED ${PUBLIC_HEADERS} ${jsoncpp_sources})

 SET_TARGET_PROPERTIES(${TARGET_ARCH}_share PROPERTIES OUTPUT_NAME ${TARGET_ARCH})

 ADD_LIBRARY(${TARGET_ARCH}_static STATIC ${PUBLIC_HEADERS} ${jsoncpp_sources})

 SET_TARGET_PROPERTIES(${TARGET_ARCH}_static PROPERTIES OUTPUT_NAME ${TARGET_ARCH})

sudo apt-get install cmake

cmake .

make

SET(INDEX )

 LOCAL_PATH := $(call my-dir)

 include $(CLEAR_VARS)

 LOCAL_MODULE    := jsoncpp

 LOCAL_SRC_FILES := libarm.a

 include $(PREBUILT_STATIC_LIBRARY)  

 include $(CLEAR_VARS)

 LOCAL_MODULE    := main

 LOCAL_C_INCLUDES  := $(LOCAL_PATH)/include/json

 LOCAL_SRC_FILES := main.cpp

 LOCAL_CPPFLAGS := -fexceptions

 LOCAL_STATIC_LIBRARIES := jsoncpp  

 LOCAL_CFLAGS += -pie -fPIE

 LOCAL_LDFLAGS += -pie -fPIE

 LOCAL_LDLIBS := -llog

 include $(BUILD_EXECUTABLE)

 APP_ABI := armeabi

 APP_PLATFORM :=

 APP_STL := gnustl_static

 APP_CPPFLAGS := -fexceptions -frtti

 APP_CPPFLAGS += -std=gnu++

 APP_CPPFLAGS += -fpermissive

 #include <jni.h>

 #include <iostream>

 #include "include/json/json.h"

 using namespace std;

 void JsonTest();

 int main(){

     JsonTest();

     return ;

 }

 void JsonTest(){

     Json::Value root;

     Json::Value array;

     Json::Value item;

     for (int i = ; i < ; i ++)

     {

         item["id"] = i;

         item["name"] = "name";

         array.append(item);

     }

     root["username"] = "andy";

     root["age"] = ;

     root["array"] = array;

     string out = root.toStyledString();

     cout << out << endl;

 }

ndk-build

./main

转自：https://www.jianshu.com/p/02ccd73c927e