ubuntu移植jsoncpp到Android平台(转）

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mob604756fd2a33 2018-03-21 17:21:00

文章标签 json android linux #include 交叉编译 文章分类 代码人生

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

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

作者：Andy周

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

來源：简书

著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

json_reader.cpp
json_tool.h
json_value.cpp
json_valueiterator.inl
json_writer.cpp
version.h.in

在libjson目录新建文件CMakeLists.txt

内容如下

1 CMAKE_MINIMUM_REQUIRED(VERSION 3.5)
 2 PROJECT(Jpp)
 3 
 4 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 5 
 6 
 7 #ARCHS集合
 8 SET(ARCHS "arm" "arm64" "x86" "x86_64" "mips" "mips64")
 9 
10 #PLATFORM集合
11 SET(PLATFORM "arm-linux-androideabi" "aarch64-linux-android" "i686-linux-android" "x86_64-linux-android" "mipsel-linux-android" "mips64el-linux-android")
12 
13 
14 SET(JSONCPP_INCLUDE_DIR include)
15 
16 INCLUDE_DIRECTORIES(${JSONCPP_INCLUDE_DIR})
17 
18 SET(PUBLIC_HEADERS
19     ${JSONCPP_INCLUDE_DIR}/json/config.h
20     ${JSONCPP_INCLUDE_DIR}/json/forwards.h
21     ${JSONCPP_INCLUDE_DIR}/json/features.h
22     ${JSONCPP_INCLUDE_DIR}/json/value.h
23     ${JSONCPP_INCLUDE_DIR}/json/reader.h
24     ${JSONCPP_INCLUDE_DIR}/json/writer.h
25     ${JSONCPP_INCLUDE_DIR}/json/assertions.h
26     ${JSONCPP_INCLUDE_DIR}/json/version.h
27     )
28 
29 SOURCE_GROUP("Public API" FILES ${PUBLIC_HEADERS})
30 
31 SET(jsoncpp_sources
32                 src/json_tool.h
33                 src/json_reader.cpp
34                 src/json_valueiterator.inl
35                 src/json_value.cpp
36                 src/json_writer.cpp
37                 src/version.h.in)
38 
39 
40 #INDEX=0 "arm" 
41 #INDEX=1 "arm64"
42 #INDEX=2 "x86"
43 #INDEX=3 "x86_64"
44 #INDEX=4 "mips"
45 #INDEX=5 "mips64"
46 
47 SET(INDEX 0)
48 
49 list(GET ARCHS ${INDEX} TARGET_ARCH)
50 list(GET PLATFORM ${INDEX} TARGET_PLATFORM)
51 
52 MESSAGE("ARCH= " ${TARGET_ARCH})
53 MESSAGE("PLATFORM= " ${TARGET_PLATFORM})
54 
55 SET(CMAKE_C_COMPILER "$ENV{HOME}/android-toolchain/${TARGET_ARCH}/bin/${TARGET_PLATFORM}-gcc")
56 SET(CMAKE_CXX_COMPILER "$ENV{HOME}/android-toolchain/${TARGET_ARCH}/bin/${TARGET_PLATFORM}-g++")
57 
58 
59 SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)
60 SET(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib)
61 
62 ADD_LIBRARY(${TARGET_ARCH}_share SHARED ${PUBLIC_HEADERS} ${jsoncpp_sources})
63 SET_TARGET_PROPERTIES(${TARGET_ARCH}_share PROPERTIES OUTPUT_NAME ${TARGET_ARCH})
64 ADD_LIBRARY(${TARGET_ARCH}_static STATIC ${PUBLIC_HEADERS} ${jsoncpp_sources})
65 SET_TARGET_PROPERTIES(${TARGET_ARCH}_static PROPERTIES OUTPUT_NAME ${TARGET_ARCH})

编译之前确认已安装cmake

如果没有，请先安装

sudo apt-get install cmake

目录结构如下

ubuntu移植jsoncpp到Android平台(转）_linux

cmake .
make

ubuntu移植jsoncpp到Android平台(转）_交叉编译_02

笔者目前只编译了arm平台的，如果有需要其他平台的，只需要改动上述CMakeLists.txt中的编号即可

SET(INDEX 0)

NDK原生编译

测试

下面简单测试一下，就不建Android项目了

新建文件夹JNI

将刚才生成的libarm.a和include文件夹放入进去，新建文件Android.mk

1 LOCAL_PATH := $(call my-dir)
 2 
 3 include $(CLEAR_VARS)
 4 
 5 LOCAL_MODULE    := jsoncpp  
 6 LOCAL_SRC_FILES := libarm.a 
 7 include $(PREBUILT_STATIC_LIBRARY)  
 8   
 9 include $(CLEAR_VARS)
10 LOCAL_MODULE    := main
11 LOCAL_C_INCLUDES  := $(LOCAL_PATH)/include/json
12 LOCAL_SRC_FILES := main.cpp
13 LOCAL_CPPFLAGS := -fexceptions
14 
15 LOCAL_STATIC_LIBRARIES := jsoncpp  
16 
17 LOCAL_CFLAGS += -pie -fPIE
18 LOCAL_LDFLAGS += -pie -fPIE
19 
20 LOCAL_LDLIBS := -llog
21 
22 include $(BUILD_EXECUTABLE)

新建Application.mk文件

1 APP_ABI := armeabi
2 APP_PLATFORM := 12
3 APP_STL := gnustl_static
4 APP_CPPFLAGS := -fexceptions -frtti
5 APP_CPPFLAGS += -std=gnu++11
6 APP_CPPFLAGS += -fpermissive

新建main.cpp

1 #include <jni.h>
 2 #include <iostream>
 3 #include "include/json/json.h"
 4 
 5 using namespace std;
 6 
 7 void JsonTest();
 8 
 9 int main(){
10     JsonTest();
11     return 0;
12 }
13 
14 void JsonTest(){
15     Json::Value root;
16     Json::Value array;
17     Json::Value item;
18 
19     for (int i = 0; i < 2; i ++)
20     {
21         item["id"] = i;
22         item["name"] = "name";
23         array.append(item);
24     }
25 
26     root["username"] = "andy";
27     root["age"] = 18;
28     root["array"] = array;
29 
30     string out = root.toStyledString();
31     cout << out << endl;
32 }