满满的都是坑，因为服务器偷懒让客服端写统一下单，服务器只给了通知的url。微信的支付demo并没有统一下单的代码。
读此文前先阅读： https://pay.weixin.qq.com/wiki/doc/api/app/app.PHP?chapter=9_1
一步步的来 先根据统一下单的参数介绍工具：
1. 获取到当前的ip：
<span style="font-size:14px;">public String getLocalIpAddress() { try { for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) { NetworkInterface intf = en.nextElement(); for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) { InetAddress inetAddress = enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); } } } } catch (SocketException ex) { } return null; } private String getWifiIp() { //获取wifi服务 WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); //判断wifi是否开启 if (!wifiManager.isWifiEnabled()) { wifiManager.setWifiEnabled(true); } WifiInfo wifiInfo = wifiManager.getConnectionInfo(); int ipAddress = wifiInfo.getIpAddress(); String ip = intToIp(ipAddress); return ip; } private String intToIp(int i) { return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + (i >> 24 & 0xFF); } </span> 2.随机订单号生成 test 你们可根据自己生成随机数：
<span style="font-size:14px;">private String genOutTradNo() { Random random = new Random(); return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes()); }</span> 3.签名工具：
<span style="font-size:14px;">private String genAppSign(List<NameValuePair> params) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < params.size(); i++) { sb.append(params.get(i).getName()); sb.append('='); sb.append(params.get(i).getValue()); sb.append('&'); } sb.append("key="); sb.append(Constants.API_KEY); this.sb.append("sign str/n"+sb.toString()+"/n/n"); String appSign = MD5.getMessageDigest(sb.toString().getBytes()); Log.e("orion",appSign); return appSign; }</span> 差不多了 现在我们需要生成传递的参数 参数要求是xml 格式的：
<span style="font-size:14px;">private String genProductArgs() { StringBuffer xml = new StringBuffer(); String ip = getWifiIp(); if (ip == "" && ip == "") { ip = getLocalIpAddress(); } try { String nonceStr = genNonceStr(); xml.append("</xml>"); List<NameValuePair> packageParams = new LinkedList<NameValuePair>(); packageParams.add(new BasicNameValuePair("appid", Constants.APP_ID)); packageParams.add(new BasicNameValuePair("body", "APP pay test")); packageParams.add(new BasicNameValuePair("mch_id", Constants.MCH_ID)); packageParams.add(new BasicNameValuePair("nonce_str", nonceStr)); packageParams.add(new BasicNameValuePair("notify_url",ConfigUtil.NOTIFY_URL)); packageParams.add(new BasicNameValuePair("out_trade_no",genOutTradNo())); packageParams.add(new BasicNameValuePair("spbill_create_ip",ip)); packageParams.add(new BasicNameValuePair("total_fee", "1")); packageParams.add(new BasicNameValuePair("trade_type", "APP")); String sign = genPackageSign(packageParams); packageParams.add(new BasicNameValuePair("sign", sign)); String xmlstring =toXml(packageParams); return xmlstring; } catch (Exception e) { Log.e("TAG", "fail, ex = " + e.getMessage()); return null; } }</span> 其中 toxml：
<span style="font-size:14px;">private String toXml(List<NameValuePair> params) { StringBuilder sb = new StringBuilder(); sb.append("<xml>"); for (int i = 0; i < params.size(); i++) { sb.append("<"+params.get(i).getName()+">"); sb.append(params.get(i).getValue()); sb.append("</"+params.get(i).getName()+">"); } sb.append("</xml>"); Log.e("orion",sb.toString()); return sb.toString(); }</span> 得到传递的参数，根据文档指示，我们需要用post去吊连接URL地址：https://api.mch.weixin.qq.com/pay/unifiedorder：
<span style="font-size:14px;"> private class GetPrepayIdTask extends AsyncTask<Void, Void, Map<String,String>> { private ProgressDialog dialog; @Override protected void onPreExecute() { dialog = ProgressDialog.show(PayActivity.this, getString(R.string.app_tip), getString(R.string.getting_prepayid)); } @Override protected void onPostExecute(Map<String,String> result) { if (dialog != null) { dialog.dismiss(); } sb.append("prepay_id/n"+result.get("prepay_id")+"/n/n"); resultunifiedorder=result; } @Override protected void onCancelled() { super.onCancelled(); } @Override protected Map<String,String> doInBackground(Void... params) { String url = String.format("https://api.mch.weixin.qq.com/pay/unifiedorder"); String entity = genProductArgs(); Log.e("orion",entity); byte[] buf = Util.httpPost(url, entity); String content = new String(buf); Log.e("orion", content); Map<String,String> xml=decodeXml(content); return xml; } }</span> 其中decodexml就是：
<span style="font-size:14px;">public Map<String,String> decodeXml(String content) { try { Map<String, String> xml = new HashMap<String, String>(); XmlPullParser parser = Xml.newPullParser(); parser.setInput(new StringReader(content)); int event = parser.getEventType(); while (event != XmlPullParser.END_DOCUMENT) { String nodeName=parser.getName(); switch (event) { case XmlPullParser.START_DOCUMENT: break; case XmlPullParser.START_TAG: if("xml".equals(nodeName)==false){ //实例化student对象 xml.put(nodeName,parser.nextText()); } break; case XmlPullParser.END_TAG: break; } event = parser.next(); } return xml; } catch (Exception e) { Log.e("orion",e.toString()); } return null; }</span> 下单完成，第二部就是给微信支付传递调起微信支付的参数（具体参数看文档说明）：
<span style="font-size:14px;">private void genPayReq() { req.appId = Constants.APP_ID; req.partnerId = Constants.MCH_ID; req.prepayId = resultunifiedorder.get("prepay_id"); req.packageValue = "prepay_id="+resultunifiedorder.get("prepay_id"); req.nonceStr = genNonceStr(); req.timeStamp = String.valueOf(genTimeStamp()); List<NameValuePair> signParams = new LinkedList<NameValuePair>(); signParams.add(new BasicNameValuePair("appid", req.appId)); signParams.add(new BasicNameValuePair("noncestr", req.nonceStr)); signParams.add(new BasicNameValuePair("package", req.packageValue)); signParams.add(new BasicNameValuePair("partnerid", req.partnerId)); signParams.add(new BasicNameValuePair("prepayid", req.prepayId)); signParams.add(new BasicNameValuePair("timestamp", req.timeStamp)); req.sign = genAppSign(signParams); sb.append("sign/n"+req.sign+"/n/n"); Log.e("orion", signParams.toString()); }</span> 第三部，调微信支付：
<span style="font-size:14px;">private void sendPayReq() { msgApi.registerApp(Constants.APP_ID); msgApi.sendReq(req); }</span> 其中：
<span style="font-size:14px;">Constants.APP_ID</span>
是appid 在开发者平台获取
<span style="font-size:14px;"> req.partnerId = Constants.MCH_ID;</span>
商户id
<span style="font-size:14px;">ConfigUtil.NOTIFY_URL</span>
支付后的回调通知地址。
签名两次，然后用的api――key是商户平台api安全里面自定义的。
对了 还有个获取时间工具
<span style="font-size:14px;">private long genTimeStamp() { return System.currentTimeMillis() / 1000; }</span> 以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持武林网。
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