我们需要在json文件中记录一下总数，文件格式如下：
[{"total_count":0,"total_count1":0,"total_count2":0,"total_count3":0,"total_count4":0}]
目录
1. Android.bp中新增
2. 头文件添加
3. 向json文件写入数据
4. 读取json文件内容
1. Android.bp中新增
static_libs: [
"libjsoncpp",
],
2. 头文件添加
#include <json/json.h>
3. 向json文件写入数据
long long totalCount = 0;long long totalCount2 = 0;long long totalCount3 = 0;long long totalCount4 = 0;fstream fileStream;fileStream.open("/sdcard/test.json", ios::out | ios::in);if (!fileStream.is_open()) {return;}Json::Value root;Json::Value item;item["total_count"] = Json::Int64(totalCount);item["total_count2"] = Json::Int64(totalCount2);item["total_count3"] = Json::Int64(total_count3);item["total_count4"] = Json::Int64(total_count4);root.append(item);Json::FastWriter wb; string str = wb.write(root);fileStream << str;fileStream.flush();写完之后，/sdcard/test.json文件内容如下：
[{"total_count":0,"total_count1":0,"total_count2":0,"total_count3":0,"total_count4":0}]
4. 读取json文件内容
fileStream.open("/sdcard/test.json", ios::out | ios::in);if (!fileStream.is_open()) {return;}isTotalStreamValid = true;char buffer[1024];fileStream.getline(buffer, sizeof(buffer));Json::Reader reader;Json::Value root;if (!reader.parse(buffer, root)) {return;}totalCount = root[0]["total_count"].asInt64();totalCount2 = root[0]["total_count2"].asInt64();totalCount3 = root[0]["total_count3"].asInt64();totalCount4 = root[0]["total_count4"].asInt64();
)
