【笔记】【开发方案】APN 配置参数 bitmask 数据转换（Android KaiOS）

一、参数说明

（一）APN配置结构对比

平台	Android	KaiOS
文件类型	xml	json
结构	每个<apn>标签是一条APN，包含完成的信息	层级数组结构，使用JSON格式的数据。最外层是mcc，其次mnc，最后APN用数组形式配置（每个APN都是一个对象，不含mccmnc属性）。

Android: apns-conf.xml

<!-- Android: apns-conf.xml -->
<?xml version="1.0" encoding="utf-8"?>
<apns version="8">
  <apn carrier="T-Mobile US" mcc="001" mnc="01" apn="fast.t-mobile.com" user="" password="" server="" proxy="" port="" mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc" mmsproxy="" mmsport="" type="default,mms,supl,hipri,xcap,rcs" protocol="IPV6" roaming_protocol="IP" bearer_bitmask="" mvno_type="ecid" mvno_match_data="[4]4310260" class="" user_visible="true" user_editable="true" authtype="0"/>
</apns>

KaiOS: apns.json

特别需要注意格式（很容易出错），数组最后不用加逗号，注意大/中括号的首位一致性。

{
"202": {
  "10": [
    {"carrier":"Wind Internet","apn":"gint.b-online.gr","type":["default","supl"]},
    {"voicemail":"122","type":["operatorvariant"]},
    {"carrier":"Wind MMS","apn":"mnet.b-online.gr","mmsc":"http://192.168.200.95/servlets/mms","mmsproxy":"192.168.200.11","mmsport":"9401","type":["mms"]}
  ],
  "01": [
    {"carrier":"Cosmote Wireless Internet","apn":"","type":["ia"]},
    {"voicemail":"123","type":["operatorvariant"]},
    {"carrier":"Cosmote Wireless Internet","apn":"internet","type":["default","supl"]},
    {"carrier":"Cosmote Mms","apn":"mms","mmsc":"http://mmsc.cosmote.gr:8002","mmsproxy":"10.10.10.20","mmsport":"8080","type":["mms"]}
  ],
  "09": [
    {"carrier":"Q Internet","apn":"myq","type":["default","supl"]},
    {"voicemail":"122","type":["operatorvariant"]},
    {"carrier":"Q-Telecom MMS GPRS","apn":"q-mms.myq.gr","mmsc":"http://mms.myq.gr","mmsproxy":"192.168.80.134","mmsport":"8080","type":["mms"]}
  ]
},
"001": {
  "01": [
    {"carrier":"Testing SIM default","apn":"test","type":["default"],"protocol":"IPV4V6","roaming_protocol":"IPV4V6","user_visible":"true"},
    {"carrier":"IMS","apn":"ims","type":["ims"],"protocol":"IPV4V6","roaming_protocol":"IPV4V6","user_visible":"true"},
    {"carrier":"XCAP","apn":"xcap","type":["xcap"],"protocol":"IPV4V6","roaming_protocol":"IPV4V6","user_visible":"true","authtype":"0"}
  ]
}
}

（二）bearer配置值对比

1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20 （The original bearer value in Android，位运算）
1048575（The original bearer value in KaiOS using decimalism)

二、代码解析

（一）Android

待完善

（二）KaiOS

DataCallManager.jsm
apn_editor_const.js

1、bitmask的进制转换

可以参考PDN建立逻辑，gecko/dom/system/gonk/radio/DataCallManager.jsm

//DataCallManager.jsm

//检查对应的rat是否包含在此APN bearer 配置中
// Check rat value include in the bit map or not.
function bitmaskHasTech(aBearerBitmask, aRadioTech) {
  if (aBearerBitmask == 0) {
    return true;
  } else if (aRadioTech > 0) {
    return (aBearerBitmask & (1 << (aRadioTech - 1))) != 0;
  }
  return false;
}

//bearer十进制转成二进制
// Show the detail rat type.
function bitmaskToString(aBearerBitmask) {
  if (aBearerBitmask == 0 || aBearerBitmask === undefined) {
    return 0;
  }

  let val = "";
  for (let i = 1; i < RIL.GECKO_RADIO_TECH.length; i++) {
    if ((aBearerBitmask & (1 << (i - 1))) != 0) {
      val = val.concat(i + "|");
    }
  }
  return val;
}

function bearerBitmapHasCdma(aBearerBitmask) {
  return (RIL_RADIO_CDMA_TECHNOLOGY_BITMASK & aBearerBitmask) != 0;
}

在bitmaskToString接口中，将bitmask转化成String时，循环RIL.GECKO_RADIO_TECH的长度次，经过位运算转换成与Android原始配置的bearer_bitmask相同格式的bearer位符，用“|”间隔rat类型位。

是如何通过RIL调用ril_consts.js内的GECKO_RADIO_TECH？

在DataCallManager.jsm 中定义RIL对象，并使用XPCOMUtils.defineLazyGetter()方法来实现懒加载，即在要使用时才加载和初始化对象（只有在第一次访问该对象时才会进行初始化和加载），避免不必要的性能开销和资源浪费。
RIL对象是通过ChromeUtils.import 方法从ril_consts.js文件中导入的，该对象由ril_consts.js文件中的代码创建和初始化的。

//DataCallManaer.jsm

"use strict";

//XPCOM 是一个用于 实现跨语言组件的技术框架。
//导入XPCOMUtils对象（工具库），简化和封装XPCOM组件的开发和使用。
//使用常量const来定义 XPCOMUtils 对象，以确保在运行时不会发生对象被重新赋值的情况。
const { XPCOMUtils } = ChromeUtils.import(
  "resource://gre/modules/XPCOMUtils.jsm"
);

//定义RIL对象，后续调用 RIL.GECKO_RADIO_TECH
XPCOMUtils.defineLazyGetter(this, "RIL", function() {
  return ChromeUtils.import("resource://gre/modules/ril_consts.js");
});


//ref RIL.GECKO_RADIO_TECH
const TCP_BUFFER_SIZES = [
  null,
  "4092,8760,48000,4096,8760,48000", // gprs
  "4093,26280,70800,4096,16384,70800", // edge
  "58254,349525,1048576,58254,349525,1048576", // umts
  "16384,32768,131072,4096,16384,102400", // is95a = 1xrtt
  "16384,32768,131072,4096,16384,102400", // is95b = 1xrtt
  "16384,32768,131072,4096,16384,102400", // 1xrtt
  "4094,87380,262144,4096,16384,262144", // evdo0
  "4094,87380,262144,4096,16384,262144", // evdoa
  "61167,367002,1101005,8738,52429,262114", // hsdpa
  "40778,244668,734003,16777,100663,301990", // hsupa = hspa
  "40778,244668,734003,16777,100663,301990", // hspa
  "4094,87380,262144,4096,16384,262144", // evdob
  "131072,262144,1048576,4096,16384,524288", // ehrpd
  "524288,1048576,2097152,262144,524288,1048576", // lte
  "122334,734003,2202010,32040,192239,576717", // hspa+
  "4096,87380,110208,4096,16384,110208", // gsm (using default value)
  "4096,87380,110208,4096,16384,110208", // tdscdma (using default value)
  "122334,734003,2202010,32040,192239,576717", // iwlan
  "122334,734003,2202010,32040,192239,576717", // ca
];


//定义了一个常量RIL_RADIO_CDMA_TECHNOLOGY_BITMASK，用于表示CDMA射频技术类型的掩码值。
//RIL.GECKO_RADIO_TECH.indexOf 查找各个CDMA技术类型在GECKO_RADIO_TECH数组中的下标值，
//-1 的目的是得到对应的掩码位数，并将此转换成掩码值，
//使用按位左移（<<）运算符得到掩码值，
//各个掩码值按位或（|）操作得到最终的掩码值。
const RIL_RADIO_CDMA_TECHNOLOGY_BITMASK =
  (1 << (RIL.GECKO_RADIO_TECH.indexOf("is95a") - 1)) |
  (1 << (RIL.GECKO_RADIO_TECH.indexOf("is95b") - 1)) |
  (1 << (RIL.GECKO_RADIO_TECH.indexOf("1xrtt") - 1)) |
  (1 << (RIL.GECKO_RADIO_TECH.indexOf("evdo0") - 1)) |
  (1 << (RIL.GECKO_RADIO_TECH.indexOf("evdoa") - 1)) |
  (1 << (RIL.GECKO_RADIO_TECH.indexOf("evdob") - 1)) |
  (1 << (RIL.GECKO_RADIO_TECH.indexOf("ehrpd") - 1));


// set to true in ril_consts.js to see debug messages
var DEBUG = RIL_DEBUG.DEBUG_RIL;   //调试用的log打印标识符

如上代码，CDMA技术类型对应的掩码值RIL_RADIO_CDMA_TECHNO如下：

is95a: 1 << (5-1) = 0x10
is95b: 1 << (6-1) = 0x20
1xrtt: 1 << (7-1) = 0x40
evdo0: 1 << (8-1) = 0x80
evdoa: 1 << (9-1) = 0x100
evdob: 1 << (14-1) = 0x2000
ehrpd: 1 << (15-1) = 0x4000

2、GECKO_RADIO_TECH 定义网络制式 (ril_consts.js)

在KaiOS中，RIL.GECKO_RADIO_TECH数组是在Gecko内核的代码中定义的，其实现位于Gecko代码库的"gecko/dom/system/gonk/radio/ril_consts.js"文件中。该文件定义了一系列RIL层的常量，包括射频技术类型、消息ID等。在该文件中，可以找到以下代码片段，其中定义了RIL.GECKO_RADIO_TECH数组的元素和顺序：

//GECKO_RADIO_TECH 数组定义射频技术（网络连接）
this.GECKO_RADIO_TECH = [
  null,
  "gprs",     //1 GPRS
  "edge",     //2 EDGE
  "umts",     //3 UMTS
  "is95a",    //4 IS-95A
  "is95b",    //5 IS-95B
  "1xrtt",    //6 cdma1x?一种CDMA2000射频技术，是CDMAOne技术的升级版(1x Radio Transmission Technology)
  "evdo0",    //7 EVDO-0
  "evdoa",    //8 EVDO-A
  "hsdpa",    //9
  "hsupa",    //10
  "hspa",     //11
  "evdob",    //12 EVDO-B
  "ehrpd",    //13 EVDO-D
  "lte",      //14 LTE
  "hspa+",    //15 HSPA+
  "gsm",      //16 GSM
  "tdscdma",  //17 TD-SCDMA
  "iwlan",    //18 iWLAN(wifi)
  "lte_ca",   //19 LTE_CA
];

//定义遵循的协议类型
this.GECKO_PROFILE_INFO_TYPE_COMMON = 0;
this.GECKO_PROFILE_INFO_TYPE_3GPP = 1;
this.GECKO_PROFILE_INFO_TYPE_3GPP2 = 2;

3、DataCall 对 rat 的使用案例

  dataRegistrationChanged(aRadioTech) {
    let targetBearer;
    if (this.apnSetting.bearer === undefined) {
      targetBearer = 0;
    } else {
      targetBearer = this.apnSetting.bearer;
    }
    if (DEBUG) {
      this.debug(
        "dataRegistrationChanged: targetBearer: " +
          bitmaskToString(targetBearer)
      );
    }

    if (bitmaskHasTech(targetBearer, aRadioTech)) {
      // Ignore same rat type. Let handler process the retry.
    } else {
      if (DEBUG) {
        this.debug(
          "dataRegistrationChanged: current APN do not support this rat reset DC. APN:" +
            JSON.stringify(this.apnSetting)
        );
      // Clean the requestedNetworkInterfaces due to current DC can not support this rat under DC retrying state.
      // Let handler process the retry.
      let targetRequestedNetworkInterfaces = this.requestedNetworkInterfaces.slice();
      for (let networkInterface of targetRequestedNetworkInterfaces) {
        this.disconnect(networkInterface);
      }
    }
  },

gecko/koost/telephony/TelephonyBinderService.h

// Cover the GECKO_RADIO_TECH to NETWORK_TYPE_*
int32_t convertRadioTech(const nsAString& rat);

4、apn_editor_const.js 原始数据和 UI显示转换

KaiOS 基线提供了VALUE_CONVERTERS 常量对象，包含两个属性：TO_STRING和TO_DATA，每个属性包含了转换方法。

TO_STRING：将一个字符串数组转换成一个用逗号分隔的字符串
- apn_editor.js 界面显示用
TO_DATA ：将一个用逗号分隔的字符串转换为一个字符串数组
- apn_editor_session.js 保存数据库用

源码如下，可参考APN Type显示的内容，对数组进行显示和配置数据存储。

/**
 * The apn editor const
 */

define([],() => {
  const APN_PROPERTY_DEFAULTS = {
    //省略大部分原生属性
    apn: '',
    types: ['default'],
    roaming_protocol: 'notDefined',
    //自定义
    mvno_type: 'notDefined',
    mvno_match_data: '',
    bearer:['unspecified']
  };

  const APN_PROPERTIES = Object.keys(APN_PROPERTY_DEFAULTS);

  //数据转换工具接口
  const VALUE_CONVERTERS = {
    TO_STRING: { //TO_STRING属性
      types(types) {
        //判断 types参数存在、是一个数组、且数组非空，就将字符串数组转换成用逗号分隔的字符串
        // types ：参数是否存在
        // Array.isArray(types)：是否为一个数组
        // types.length：数组是否非空
        if (types && Array.isArray(types) && types.length) {
          return types.join(', ');
        }
        return 'default'; //默认返回“default”
      }
    },
    TO_DATA: { //TO_DATA属性
      types(string) {
        //将用逗号分隔的字符串转换为字符串数组
        return string.split(',').map(str => str.trim());
      }
    }
  };

  //在apn_editor.js中定义了常量调用方法，APN_PROPERTIES、APN_PROPERTY_DEFAULTS、VALUE_CONVERTERS
  return { //一个对象，三个只读get属性？外部访问但不能修改他们的值？
    get APN_PROPERTIES() {
      return APN_PROPERTIES;
    },
    get APN_PROPERTY_DEFAULTS() {
      return APN_PROPERTY_DEFAULTS;
    },
    get VALUE_CONVERTERS() {
      return VALUE_CONVERTERS;
    }
  };
});

（1）测试代码

对以上接口VALUE_CONVERTERS的测试代码和解析，输出案例：

const types = ['gprs', 'edge', 'umts'];
const str = VALUE_CONVERTERS.TO_STRING.types(types);
console.log(str); // 输出 'gprs, edge, umts'

const str = 'gprs, edge, umts';
const types = VALUE_CONVERTERS.TO_DATA.types(str);
console.log(types); // 输出 ['gprs', 'edge', 'umts']

（2）apn_editor.js 调用TO_STRING 界面显示

外部模块调用源码实现

/**
 * The apn editor module
 */
'use strict';
define(function(require) { //eslint-disable-line
  const ApnEditorConst = require('panels/apn_editor/apn_editor_const');
  const ApnEditorSession = require('panels/apn_editor/apn_editor_session');

  //引用apn_editor_const.js 定义常量
  const { APN_PROPERTIES } = ApnEditorConst;
  const { APN_PROPERTY_DEFAULTS } = ApnEditorConst;
  const { VALUE_CONVERTERS } = ApnEditorConst;
  
  ApnEditor.prototype = {
    convertValue(value, converter) {
      if (converter) {
        return converter(value);
      }
      return value;
    },
  
    fillInputElements(inputElements, apn) {
      APN_PROPERTIES.forEach(function input(name) {
        const inputElement = inputElements[name];
        if (inputElement) {
          //数据处理，调用VALUE_CONVERTERS 转成字符串
          inputElement.value = this.convertValue(
            value,
            VALUE_CONVERTERS.TO_STRING[name]
          );

        } //if inputElement
      }, this);
    },


});

（3）apn_editor_session.js 保存信息到APN数据库

在commit 中保存APN到，通过apn manager执行addApn或 updateApn

/**
 * The apn editor session module
 */
define(['require','modules/apn/apn_settings_manager','panels/apn_editor/apn_editor_const','modules/apn/apn_utils'],function(require) { //eslint-disable-line

  const ApnSettingsManager = require('modules/apn/apn_settings_manager');
  const ApnEditorConst = require('panels/apn_editor/apn_editor_const');
  const ApnUtils = require('modules/apn/apn_utils');

  const { APN_PROPERTIES } = ApnEditorConst;
  const { VALUE_CONVERTERS } = ApnEditorConst;

  function ApnEditorSession(obj, inputElements, apnItem) {
    this.serviceId = obj.serviceId;
    this.apnMode = obj.mode;
    this.inputElements = inputElements;
    this.apnItem = apnItem;
  }


  ApnEditorSession.prototype = {
    convertValue(value, converter) {
      if (converter) {
        return converter(value);
      }
      return value;
    },
    exportApnSetting(inputElements) {
      const newApnSetting = {};
      APN_PROPERTIES.forEach(function input(name) {
        const inputElement = inputElements[name];
        if (inputElement && !inputElement.hidden) {
          newApnSetting[name.toLowerCase()] = this.convertValue(
            inputElement.value,
            VALUE_CONVERTERS.TO_DATA[name]
          );
        }
      }, this);
      return newApnSetting;
    },

    //保存新增APN数据，调用addApn
    commitNew() {
      const promises = [];
      const newApnSetting = this.exportApnSetting(this.inputElements);

      promises.push(ApnSettingsManager.addApn(this.serviceId, newApnSetting));

      return Promise.all(promises);
    },

    //保存编辑APN数据，调用updateApn
    commitEdit() {
      const promises = [];
      const newApnSetting = this.exportApnSetting(this.inputElements);

      promises.push(ApnSettingsManager.updateApn(this.serviceId,
          this.apnItem.id, newApnSetting));

      return Promise.all(promises);
    },



    //在apn_editor.js中传递  new/edit选择执行新增/编辑APN
    commit() {
      switch (this.apnMode) {
        case 'new':
          return this.commitNew();
        case 'edit':
          return this.commitEdit();
        default:
          console.error('invalid mode');
          return Promise.resolve();
      }
    },

    //取消，不保存任何数据
    cancel() {
      APN_PROPERTIES.forEach(function input(name) {
        this.inputElements[name].value = '';
      }, this);
      this.apnItem = null;
    },

    //还没找到mode的用法
    get mode() {
      return this.apnMode;
    }
  };

  return function apnEditorSession(obj, inputElements, apnItem) {
    return new ApnEditorSession(obj, inputElements, apnItem);
  };
});

三、日志分析

追溯在PDN建立过程中，读取apn配置的bearer参数到DataCall使用的radio类型的bearer值变化情况。

四、方案开发

相关介绍：KaiOS 新增APN信息字段的代码实现-CSDN博客

在 APN Editor中实现bearer显示

代码模块：gaia/apps/settings/js/panels/apn_editor/apn_editor.js

/**
 * The apn editor module
 */
'use strict';
define(function(require) { //eslint-disable-line
  const ApnEditorConst = require('panels/apn_editor_tct/apn_editor_const');
  const ApnEditorSession = require('panels/apn_editor_tct/apn_editor_session');
  const ApnUtils = require('modules/apn_tct/apn_utils');

  //以下三个常量都是从ApnEditorConst模块中导入的
  const { APN_PROPERTIES } = ApnEditorConst;
  const { APN_PROPERTY_DEFAULTS } = ApnEditorConst;
  const { VALUE_CONVERTERS } = ApnEditorConst;


  return function apnEditor(rootElement) {
    return new ApnEditor(rootElement);
  };
});

（一）KaiOS

1、十进制bearer -> bitmask位码 & networkType字符

将kaios中十进制的bearer转换同Android原始配置的bitmask及映射网络类型字符串

// 功能：将十进制bearer转换成1-20字符串（同Android）
function bitmaskToString(aBearerBitmask) {
  if (aBearerBitmask == 0 || aBearerBitmask === undefined) {
    return 0;
  }

  let val = "";
  for (let i = 1; i < 20; i++) {
    if ((aBearerBitmask & (1 << (i - 1))) != 0) {
      val = val.concat(i + "|");
    }
  }
  return val;
}

//常量数组，定义rat。
//最后一个数据到底要不要逗号？源码有，参考代码可以不用 —— 兼容性问题，新的会支持 ，
const GECKO_RADIO_TECH = [
  null,
  "gprs",
  "edge",
  "umts",
  "is95a",
  "is95b",
  "1xrtt",
  "evdo0",
  "evdoa",
  "hsdpa",
  "hsupa",
  "hspa",
  "evdob",
  "ehrpd",
  "lte",
  "hspa+",
  "gsm",
  "tdscdma",
  "iwlan",
  "lte_ca",
];

//将1-20的bitmask转换成对应的网络制式
function bitmaskToRatString(aBitmask) {
   if (aBitmask == 0 || aBitmask === undefined) {
    return "unspecified";
  }
  let rat = "";
  let splitResult = aBitmask.split("|");
  console.log('splitResult = '+ splitResult);
  rat = splitResult.map(x => GECKO_RADIO_TECH[x]).join(",").slice(0,-1);
  //slice(startIndex,endIndex) 用于去掉最后一个逗号
  return rat;
}

// 测试代码
let apnBearer = '312312';  //apn.json原始配置值
let targetBearer;  //1-20转换目标值
let bearerString = '';

if (apnBearer === undefined) {
    targetBearer = 0;
} else {
    targetBearer = apnBearer;
}

bearerString = bitmaskToString(targetBearer);
let ratString = bitmaskToRatString(bearerString);

// 输出结果
console.log('targetBearer = ' + targetBearer);
console.log('bearerString = '+ bearerString);
console.log('ratString = ' + ratString);

存在一个问题，在UI显示了rat的字符串，那么 commitEdit() 的时候会保存bearer为字符串，应该需要在apn_editor_session.js 中处理ApnSettings内容。

难点在于如何将gprs,edge,is95b,1xrtt 转换成bearer数值（ bitmask=1|2|5|6 甚至是十进制原文）

2、networktype字符 -> bitmask 位码

convertNetworkTypeToBitmask，将networktype字符串转换成bitmask（1|18|20格式）

//映射表，包含了不同的网络类型和对应的数字码。
const networkTypeMap = {
  "unspecified": "0",
  "gprs": "1",
  "edge": "2",
  "umts": "3",
  "is95a": "4",
  "is95b": "5",
  "1xrtt": "6",
  "evdo0": "7",
  "evdoa": "8",
  "hsdpa": "9",
  "hsupa": "10",
  "hspa": "11",
  "evdob": "12",
  "ehrpd": "13",
  "lte": "14",
  "hspa+": "15",
  "gsm": "16",
  "tdscdma": "17",
  "iwlan": "18",
  "lte_ca": "19"
};


//测试代码
//一、简单程序 
let bearerString = "gprs,edge,umts,hsdpa,hsupa,hspa,lte,hspa+"; //界面显示字符串包含多个网络类型，使用逗号分隔
let networkTypes  = bearerString.split(","); //string转换成字符串数组
let bitCode =  Array.from(networkTypes, bearerString => networkTypeMap[bearerString]); //将字符串数组转换成数字码数组
let bitmask = bitCode.join("|");

console.log("networkTypes = " + networkTypes);
console.log("bitCode = " + bitCode);


//二、改善，封装成接口调用
//参数类型：字符串 "gprs,edge,umts,hsdpa,hsupa,hspa,lte,hspa+"
//let bearerString = "gprs,edge,umts,hsdpa,hsupa,hspa,lte,hspa+"; 
function convertNetworkTypeToBitmask(aNetworkTypes) {
  let bitmask = '0'; //初始化为0和"0"的区别？
  if (aNetworkTypes == 0 || aNetworkTypes === undefined) {
    return 0;
  }

  //networkTypesArray是一个字符串数组，存储着多个网络类型的字符串，例如 ['gprs', 'edge']
  let networkTypesArray = aNetworkTypes.split(","); //字符串转成字符串数组
  
  //networkTypesBitCode是一个数字码数组，如[ '1', '2', '3' ]
  //映射函数对每个字符串进行转换，函数参数是每个字符串，它在映射表中对应的值就是所需bit位数字码
  //映射函数的代码为 aNetworkTypes => networkTypeMap[aNetworkTypes]
  let networkTypesBitCode = Array.from(networkTypesArray, aNetworkTypes => networkTypeMap[aNetworkTypes]); //字符串数组转换成功数字码 
  
  bitmask = networkTypesBitCode.join("|");
  return bitmask;
}

console.log("bitmask(api) = " + convertNetworkTypeToBitmask(bearerString));

//如果传参是数组，就更简单的封装接口了
//接受一个包含网络类型的数组作为参数，并将这个数组中的每种网络类型转换为对应的数字码，
//返回一个由数字码组成的字符串，使用"|"符号分隔，即bitmask

//通过map()方法遍历这个数组，将每种网络类型转换为对应的数字码，存在codes数组
//通过join()方法将codes数字码连接成字符串 ，用“|”符号分隔。


function convertNetworkTypes(networkTypes) {
  const codes = networkTypes.map(type => networkTypeMap[type]);
  return codes.join("|");
}

const types = ["gprs", "edge", "is95b", "1xrtt"];
const codeString = convertNetworkTypes(types);  // "1|2|5|6"

3、networktype字符 -> 十进制bearer

用如下bitcode数组能便于转换成 bitmask位码和十进制，不能直接通过bitmask转换成十进制，即bitmask 位码 -> 十进制bearer

bitcode = 1,2,3,9,10,11,14,15

const NETWORK_TYPE_MAP = {
  "unspecified": "0",
  "gprs": "1",
  "edge": "2",
  "umts": "3",
  "is95a": "4",
  "is95b": "5",
  "1xrtt": "6",
  "evdo0": "7",
  "evdoa": "8",
  "hsdpa": "9",
  "hsupa": "10",
  "hspa": "11",
  "evdob": "12",
  "ehrpd": "13",
  "lte": "14",
  "hspa+": "15",
  "gsm": "16",
  "tdscdma": "17",
  "iwlan": "18",
  "lte_ca": "19"
};

//参数类型：字符串 "gprs,edge,umts,hsdpa,hsupa,hspa,lte,hspa+"
//let bearerString = "gprs,edge,umts,hsdpa,hsupa,hspa,lte,hspa+"; 
function convertNetworkTypeToBitCode(aNetworkTypes) {
  console.log("convertBitcodeToBearer: aNetworkTypes = " + aNetworkTypes);
  let bitcode = '0';
  if (aNetworkTypes == 0 || aNetworkTypes === undefined) {
    return 0;
  }
  let networkTypesArray = aNetworkTypes.split(","); //字符串转成字符串数组
  bitcode = Array.from(networkTypesArray, aNetworkTypes => NETWORK_TYPE_MAP[aNetworkTypes]); //  
  console.log("convertNetworkTypeToBitCode: bitcode = " + bitcode);
  return bitcode;
}

function convertBitCodeToBitmask(aBitCode) {
 let bitmask = aBitCode.join("|");
 console.log("convertBitCodeToBitmask: bitmask = " + bitmask);
 return bitmask;
}

function convertBitcodeToBearer(aBitCode) {
    let bearerDec = 0;
    let bearerBin =0;
    if (aBitCode == 0 || aBitCode === undefined) {
      return 0;
  	}
    
    //parseInt((code).toString(2)) 是将数字 code转成二进制字符串
    bearerBin = aBitCode.map(code => parseInt(code).toString(2)).join(""); //转成二进制
    console.log("convertBitcodeToBearer: bearerBin = " + bearerBin);
    bearerDec = parseInt(bearerBin,2);//将二进制转换成十进制 。
    console.log("convertBitcodeToBearer: bearerDec = " + bearerDec);
    return bearerDec;
}

let bearerString = "gprs,edge,umts,hsdpa,hsupa,hspa,lte,hspa+"; //界面显示字符串包含多个网络类型，使用逗号分隔

convertBitCodeToBitmask(convertNetworkTypeToBitCode(bearerString));
convertBitcodeToBearer(convertNetworkTypeToBitCode(bearerString));

bearerBin 存在问题，在bitcode 转成20位二进制数的时候，输出的bearerBin 不正确

优化以上代码：

  function convertNetworkTypeToBearer(aNetworkTypes) {
    dump('apn_editor_session: StringToBearer aNetworkTypes = ' + aNetworkTypes);
    if (aNetworkTypes == 0 || aNetworkTypes === undefined) {
      return 0;
    }
    let bitcode = '0';
    let bearerBin = "";
    let bearer = 0;
    let networkTypesArray = aNetworkTypes.split(",");
    bitcode = Array.from(networkTypesArray, aNetworkTypes => NETWORK_TYPE_MAP[aNetworkTypes]);  //bitcode array  like [18,14]
    bitcode =  bitcode.sort(function(a, b) {
      return a - b;
    });
    dump('apn_editor_session: StringToBearer bitcode = ' + bitcode);
    let bearerArray = new Array(20).fill(0);
    for (let i = 0; i < bitcode.length; i++) {
        bearerArray[bitcode[i]-1] = 1;
        dump('apn_editor: StringToBearer bitcode[i] = ' + bitcode[i]);
    }
    dump('apn_editor_session: StringToBearer bearerArray = ' + bearerArray);
    bearerBin = bearerArray.reverse().join("");
    bearer = parseInt(bearerBin,2);
    dump('apn_editor_session: StringToBearer bearer = ' + bearer);
    return bearer;
  }