react-native实现微信分享和微信支付（安卓端）_react-native 转发微信

1、注册应用微信开放平台

去注册账号并且创建一个移动应用

其中，需要注意安卓包名和签名如何获取？首先，下载获取签名的工具

下载后，在手机上安装并打开

 包名在项目里面AndroidManifest.xml里面：

根据这个包名，就可以生成签名 

2、安装插件 npm install react-native-wechat --save

在如下目录下，创建wxapi文件夹

 并在文件夹内创建WXEntryActivity.java，用于获得微信的授权和分享权限。XEntryActivity.java代码：

package com.ruqizhi.jxrw.wxapi;

import android.app.Activity;
import android.os.Bundle;
import com.theweflex.react.WeChatModule;

public class WXEntryActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    WeChatModule.handleIntent(getIntent());
    finish();
  }
}

注：最上面的package包名，是你自己项目的包名路径

并在文件夹内创建WXPayEntryActivity.java，用于获得微信的授权和支付权限。
WXPayEntryActivity.java代码：

package com.ruqizhi.jxrw.wxapi;

import android.app.Activity;
import android.os.Bundle;
import com.theweflex.react.WeChatModule;

public class WXPayEntryActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    WeChatModule.handleIntent(getIntent());
    finish();
  }
}

在AndroidManifest.xml添加声明：

<activity
        android:name=".wxapi.WXEntryActivity"
        android:label="@string/app_name"
        android:exported="true"
/>
<activity
        android:name=".wxapi.WXPayEntryActivity"
        android:label="@string/app_name"
        android:exported="true"
/>

至此，声明完毕。

3、具体运用

import * as WeChat from 'react-native-wechat'

并且在构造函数内添加你的appid：
WeChat.registerApp('你的appid');

下面就是分享的代码了

分享给好友：

WeChat.isWXAppInstalled().then((isInstalled) => {
    if (isInstalled) {
      WeChat.shareToSession({
        type: 'news',
        title: 'title',
        description:'desc',
        thumbImage:imgUrl, //自定义
        webpageUrl:shareUrl,//自定义
      }).then(res =>{
        Toast.message('分享成功');
      }).catch((error) => {
         Toast.show(error.message);
        });
    } else {
      Toast.show('请安装微信');
    }
  });

分享到朋友圈：

WeChat.isWXAppInstalled().then((isInstalled) => {
    if (isInstalled) {
      WeChat.shareToTimeline({
        type: 'news',
        title: 'title',
        description:'desc',
        thumbImage:imgUrl,//自定义
        webpageUrl:`shareUrl,//自定义
      }).then(res =>{
        Toast.message('分享成功');
      }).catch((error) => {
          Toast.show(error.message);
        });
    } else {
     Toast.show('请安装微信');
    }
  });

分享的比较简单，下面见支付的

4、微信支付

微信支付需要先调一个统一下单的接口，获取到统一下单id，然后再调支付接口就行了，先说统一下单接口：

（1）获取手机客户端的ip地址，这个一般服务器端写个接口，返回客户端ip地址就行了

（2）生成sign

import {hex_md5} from "./MD5"
export const appid = '你的appid';
export const appSecret = '你的appSecret';
export const key = '你的APi密钥';
export const notifyUrl = '支付回调url，是个后端接口';
export const body = '自己定义'; //中文需要进行utf-8转码
export const mchId = '你的商户id';

其中key，去下面这个地方找

其中MD5.js代码如下：

var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

export function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
export function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
export function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}
export function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
export function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
export function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }

/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test()
{
  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
function core_md5(x, len)
{
  /* append padding */
  x[len >> 5] |= 0x80 << ((len) % 32);
  x[(((len + 64) >>> 9) << 4) + 14] = len;

  var a =  1732584193;
  var b = -271733879;
  var c = -1732584194;
  var d =  271733878;

  for(var i = 0; i < x.length; i += 16)
  {
    var olda = a;
    var oldb = b;
    var oldc = c;
    var oldd = d;

    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

    a = safe_add(a, olda);
    b = safe_add(b, oldb);
    c = safe_add(c, oldc);
    d = safe_add(d, oldd);
  }
  return Array(a, b, c, d);

}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t)
{
  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
function core_hmac_md5(key, data)
{
  var bkey = str2binl(key);
  if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);

  var ipad = Array(16), opad = Array(16);
  for(var i = 0; i < 16; i++)
  {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }

  var hash = core_md5(ipad.concat(str2binl(data)), 512 + data?.length * chrsz);
  return core_md5(opad.concat(hash), 512 + 128);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt)
{
  return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(str)
{
  var bin = Array();
  var mask = (1 << chrsz) - 1;
  for(var i = 0; i < str?.length * chrsz; i += chrsz)
    bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
  return bin;
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin)
{
  var str = "";
  var mask = (1 << chrsz) - 1;
  for(var i = 0; i < bin?.length * 32; i += chrsz)
    str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
  return str;
}

/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(binarray)
{
  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
  var str = "";
  for(var i = 0; i < binarray?.length * 4; i++)
  {
    str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
      hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
  }
  return str;
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray)
{
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var str = "";
  for(var i = 0; i < binarray.length * 4; i += 3)
  {
    var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
      | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
      |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
    for(var j = 0; j < 4; j++)
    {
      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
    }
  }
  return str;
}
生成签名代码如下：

let b = body;
 b = eval('\''+encodeURI(b).replace(/%/gm, '\\x')+'\''); //如果body是中文，进行utf-8编码
 let stringA=`appid=${appid}&body=${b}&mch_id=${mchId}&nonce_str=${noticeStr}&notify_url=${notifyUrl}&out_trade_no=${noticeStr}&spbill_create_ip=${ip}&total_fee=${1}&trade_type=APP&key=${key}`;
 let sign = hex_md5(stringA).toUpperCase();
 return sign;

其中noticeStr是代表订单号，随机生成不重复，不超过32位即可，ip就是上面提到的客户端ip

获取到签名sign后，就是调统一接单接口，这个接口请求是xml格式，入参如下：

let xml = `<xml>
  <appid><![CDATA[${appid}]]></appid>
  <body><![CDATA[${body}]]></body>
  <mch_id><![CDATA[${mchId}]]></mch_id>
  <nonce_str><![CDATA[${noticeStr}]]></nonce_str>
  <notify_url><![CDATA[${notifyUrl}]]></notify_url>
  <out_trade_no><![CDATA[${noticeStr}]]></out_trade_no>
  <spbill_create_ip><![CDATA[${ip}]]></spbill_create_ip>
  <total_fee><![CDATA[${1}]]></total_fee>
  <trade_type><![CDATA[APP]]></trade_type>
  <sign><![CDATA[${sign}]]></sign>
</xml>`

const options = {
    method: 'https://api.mch.weixin.qq.com/pay/unifiedorder',
    credentials: 'include',
    headers: {
        'content-type': 'application/json',
        'accept': acceptType
    },
    timeout:120*1000
}
return new Promise((resolve, reject) => {
    fetch(url, options)
      // 请求状态成功，解析请求数据
      .then(async res => {
          if (res.status >= 200 && res.status < 300) {
              const responseJson = await res.text();
              // console.log('111---',responseJson);         

              xml2js.parseString(res,(err,data)=>{
                 resolve(data.xml);
             })
          }
          reject(`${res.status}`);
      }).catch(e => {
        reject(e.message)
    });
});

注意：标红的是关键，因为返回的是xml格式数据，所以需要npm install 

react-native-xml2js --save,然后引入 

import xml2js from 'react-native-xml2js/lib/parser';

至此统一下单接口调完了，可以得到prepay_id,，然后再获取支付的签名sign

//必须按照字符的ASCII码降序排列
let stringA=`appid=${appid}&noncestr=${noticeStr}&package=Sign=WXPay&partnerid=${mchId}&prepayid=${prepayid}&timestamp=${time}&key=${key}`;
let paySign= hex_md5(stringA).toUpperCase();
return paySign;

其中，prepayid就是上面得到的统一下单id,time是当前时间

let time = `${new Date().getTime()}`;这样获取，key和上面的api密钥一样。

最后调支付接口：

WeChat.pay({
  partnerId: mchId,  // 商家向财付通申请的商家id
  prepayId: prepay_id,   // 预支付订单
  nonceStr:noticeStr,   // 随机串，防重发
  timeStamp: time,  // 时间戳，防重发.
  package: 'Sign=WXPay',    // 商家根据财付通文档填写的数据和签名
  sign: paySign     // 上面得到的支付签名
}).then((requestJson)=>{
  //支付成功回调
  if (requestJson.errCode=="0"){
    //回调成功处理
    Toast.message('支付成功');
  }
}).catch((err)=>{
  Toast.message('支付失败')
})

至此，微信支付成功了