一、Android端使用protobuf
1、在工程的build.gradle文件中添加

classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.6'

如图：

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2、在app的build.gradle文件中的dependencies添加 依赖

    //protobuffer 数据封装
    implementation 'com.google.protobuf:protobuf-java:2.6.1'
    implementation 'com.google.protobuf:protoc:2.6.1'

3、书写.proto文件 如图

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例如：我项目中的.proto 文件的内容

package santint.balance;
//数据包载体
enum CMD_TYPE{
  Login_req_ = 1; //登录申请
  Login_rsp_ = 2; //登录返回
  Senddata_req_ = 3;//客户端请求发送数据
  Senddata_rsp_ = 4;//服务端收到数据后回复
  Supplier_req_ = 5;//请求供应商信息
  Supplier_rsp_ = 6;//返回供应商信息
  Food_req_ = 7; //客户端请求发送菜品信息
  Food_rsp_ = 8; //服务端收到菜品信息后回复
  SaveImage_req_ = 9; //请求发送图片
  SaveImage_rsp_ = 10; //回复是否存储好图片
  SelectFoodID_req_ = 11; //查询食材ID
  SelectFoodID_rsp_ = 12; //返回食材ID
//  SelectTime_req_ = 13; //查询时间
//  SelectTime_rsp_ = 14; //返回时间数据
}

//登录申请
message Login_req
{
  required string userName = 1;
  required string userPwd = 2;
}
//登录返回
message Login_rsp
{
  required sint32 retcode = 1;  //返回 0:正常  -1：密码错误 -2：用户名不存在  -3：其他错误
  optional sint64 userId = 2;   //用户id
  optional string userName = 3; //用户名
  required sint64 shopID = 4;   //门店ID
  optional string  error = 5;   //错误原因
}

//请求发送数据
message Senddata_req
{
  required sint64 shopID = 1;//门店ID
  required string code = 2; //物料编码
  required string name = 3; //物料名称
  required float  price = 4;    //入库单价
  required sint32 inputNum = 5;  //入库数量
  required string inputDate = 6;    //入库日期
  required sint32 outputNum = 7;    //出库数量
  required string outputDate = 8;    //出库日期
  required float  balance = 9;     //余额
}
//回复
message Senddata_rsp
{
  required sint32 msgCmd = 1;//小命令号
  required sint32 msgFlag = 2;//消息执行状态;0、成功；1、失败
  optional string msgInfo = 3;//解释说明
}

message Supplier_req
{
  required  sint64  shopID = 1;   //门店ID
  required  string  date = 2;   //日期
}

message Supplier_rsp
{
  required  sint64  shopID = 1;   //门店ID
  required  sint32  total_num = 2; //供应商数量
  repeated  SupplierInfo supplier_list = 3;//供应商信息
  message   SupplierInfo
  {
    required  string supplierCode = 1;  //供应商ID
    required  string supplierName = 2;  //供应商名称
    required  string createTime = 3;  //用户下单时间
    required  sint32 orderNum = 4;  //供应商提供的订单数量
  }
}

message Food_req
{
  required  sint64  shopID = 1;          //门店ID
  optional  string  purchase_code = 2;   //所属采购订单
  required  sint64  commodity_code = 3;  //货品编码
  optional  string  proof_image = 4;    //图片路径
  required  float   actual_amount = 5;     //实入斤数
  required  sint32  status = 6;           //状态：1=未收货，2=确认收货，3=拒收，4=缺货
  optional  string  remark = 7;           //备注.包含拒收原因或缺货原因
}

message Food_rsp
{
  required sint32 msgCmd = 1;//小命令号
  required sint32 msgFlag = 2;//消息执行状态;0、成功；1、失败
  optional string msgInfo = 3;//解释说明
}

message SaveImage_req
{
  required sint64 commodity_code = 1; //货品编码
  required string image = 2;         //图片
  optional string image_name = 3;    //图片名字
}

//回复
message SaveImage_rsp
{
  required sint32 msgCmd = 1;//小命令号
  required sint32 msgFlag = 2;//消息执行状态;0、成功；1、失败
  optional string msgInfo = 3;//解释说明
}

message SelectFoodID_req
{
  required sint64  shopID = 1;         //门店ID
  required string  purchase_code = 2;  //订单ID
  required sint64  commodity_code = 3; //货品编码
}

message SelectFoodID_rsp
{
  required  string  purchase_code = 1;  //订单ID
  required  sint64  commodity_code = 2; //货品编码
  required  sint32  status = 3;        //状态：1=未收货，2=确认收货，3=拒收，4=缺货
  optional  string  remark = 4;        //确认收货的备注、拒收原因或缺货原因
}
//message SelectTime_req
//{
//  required string  purchase_code = 1;  //订单ID
//}
//message SelectTime_rsp
//{
//  required  string  time = 1;  //时间
//}

4、根据.proto文件生成对应的文件 如图：

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5、调用.so文件向服务端发送消息

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C++文件中的方法

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