Android接入微信支付的方法

 final IWXAPI msgApi = WXAPIFactory.createWXAPI(context, null); // 将该app注册到微信 msgApi.registerApp("wxd930ea5d5a258f4f"); 

 String url = "https://api.mch.weixin.qq.com/pay/unifiedorder"; WXPrePost post = new WXPrePost(); post.appid = "你的appId"; post.mch_id = "你的商户号"; post.nonce_str = StringUtils.genNonceStr();//随机字符串 **1 post.body = "商品名称"; post.detail = "商品的描述"; post.out_trade_no = out_trade_no; //商户订单号 **2 post.total_fee = "商品价格";//单位是分 post.spbill_create_ip = getLocalIpAddress();//ip地址 **3 post.notify_url = "";//这里是后台接受支付结果通知的url地址 post.trade_type = "APP"; post.sign = genPackageSign(post);//签名 **4 List firstSignParams = getFirstSignParams(post); String xml = toXml(firstSignParams); String entity = null; try { entity = new String(xml.getBytes(), "ISO8859-1"); byte[] buf = Util.httpPost(url, entity); if (buf != null) { String content = new String(buf); Map map = decodeXml(content); if (map != null) { //再次签名(参与签名的字段有 :Appid partnerId prepayId nonceStr TimeStamp package) String appId = ""; String prepayId = ""; String nonceStr = ""; for (Map.Entry entry : map.entrySet()) { if ("appid".equals(entry.getKey())) { appId = entry.getValue(); } else if ("prepay_id".equals(entry.getKey())) { prepayId = entry.getValue(); } else if ("nonce_str".equals(entry.getKey())) { nonceStr = entry.getValue(); } } Log.d(TAG, "run: :" + appId + "/" + prepayId + "/" + nonceStr + "/"); String TimeStamp = String.valueOf(genTimeStamp()); //ok 获取二次签名 String secondPackageSign = genSecondPackageSign(getSecondSignParams(appId, prepayId, nonceStr, TimeStamp)); PayReq req = new PayReq(); req.appId = appId; req.partnerId = "商户号"; req.prepayId = prepayId; req.nonceStr = nonceStr; req.timeStamp = TimeStamp; req.packageValue = "Sign=WXPay"; req.sign = secondPackageSign; req.extData = "app data"; // optional //      System.out.println("genPackageSign3:"+post.getSign()+"/"+secondPackageSign); // 在支付之前，如果应用没有注册到微信，应该先调用IWXMsg.registerApp将应用注册到微信 mApi.sendReq(req); Log.d(TAG, "run: " + appId + "/" + prepayId + "/" + nonceStr + "/" + TimeStamp + "/" + secondPackageSign); } } } catch (Exception e) { } 

 public static byte[] httpPost(String url, String entity) { if (url == null || url.length() == 0) { Log.e(TAG, "httpPost, url is null"); return null; } HttpClient httpClient = getNewHttpClient(); HttpPost httpPost = new HttpPost(url); try { httpPost.setEntity(new StringEntity(entity)); httpPost.setHeader("Accept", "application/json"); httpPost.setHeader("Content-type", "application/json"); HttpResponse resp = httpClient.execute(httpPost); if (resp.getStatusLine().getStatusCode() != HttpStatus.SC_OK) { Log.e(TAG, "httpGet fail, status code = " + resp.getStatusLine().getStatusCode()); return null; } return EntityUtils.toByteArray(resp.getEntity()); } catch (Exception e) { Log.e(TAG, "httpPost exception, e = " + e.getMessage()); e.printStackTrace(); return null; } } 

 //获取随机字符串的方法 public static String genNonceStr() { Random random = new Random(); return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes()); } 

 private String toXml(List params) { StringBuilder sb = new StringBuilder(); sb.append(""); for (int i = 0; i "); sb.append(params.get(i).getValue()); sb.append(""); } sb.append(""); return sb.toString(); } 

 public Map decodeXml(String content) { try { Map xml = new HashMap<>(); 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)) { xml.put(nodeName, parser.nextText()); } break; case XmlPullParser.END_TAG: break; } event = parser.next(); } return xml; } catch (Exception e) { } return null; }

 @NonNull private List getFirstSignParams(WXPrePost params) { List packageParams = new LinkedList<>(); packageParams.add(new BasicNameValuePair("appid", "appId")); packageParams.add(new BasicNameValuePair("body", params.body)); packageParams.add(new BasicNameValuePair("detail", params.detail)); packageParams.add(new BasicNameValuePair("mch_id", "商户号")); packageParams.add(new BasicNameValuePair("nonce_str", params.nonce_str)); packageParams.add(new BasicNameValuePair("notify_url", params.notify_url)); packageParams.add(new BasicNameValuePair("out_trade_no", params.out_trade_no)); packageParams.add(new BasicNameValuePair("spbill_create_ip", params.spbill_create_ip)); packageParams.add(new BasicNameValuePair("total_fee", params.total_fee + "")); packageParams.add(new BasicNameValuePair("trade_type", params.trade_type)); packageParams.add(new BasicNameValuePair("sign", params.sign)); return packageParams; } 

 public class WXPrePost { //必须带的参数 public String appid; //微信开放平台审核通过的应用APPID public String mch_id; //微信支付分配的商户号 public String nonce_str; //随机字符串，不长于32位。推荐随机数生成算法 public String sign; //签名，详见签名生成算法 public String body; // 商品描述交易字段格式根据不同的应用场景按照以下格式：APP――需传入应用市场上的APP名字-实际商品名称，天天爱消除-游戏充值。 public String out_trade_no; // 商户系统内部的订单号,32个字符内、可包含字母, 其他说明见商户订单号 public int total_fee; // 订单总金额，单位为分，详见支付金额 public String spbill_create_ip; // 用户端实际ip public String notify_url; // 接收微信支付异步通知回调地址，通知url必须为直接可访问的url，不能携带参数。(后台提供的) public String trade_type; // 支付类型 // 非必须携带的参数 public String device_info; // 终端设备号(门店号或收银设备ID)，默认请传"WEB" public String detail; // 商品名称明细列表 public String attach; // 附加数据，在查询API和支付通知中原样返回，该字段主要用于商户携带订单的自定义数据 public String fee_type; // 符合ISO 4217标准的三位字母代码，默认人民币：CNY，其他值列表详见货币类型 // public String time_start; // 订单生成时间，格式为yyyyMMddHHmmss，如2009年12月25日9点10分10秒表示为20091225091010。其他详见时间规则 // public String time_expire; // 订单失效时间，格式为yyyyMMddHHmmss，如2009年12月27日9点10分10秒表示为20091227091010。其他详见时间规则 注意：最短失效时间间隔必须大于5分钟 public String goods_tag; // 商品标记，代金券或立减优惠功能的参数，说明详见代金券或立减优惠 // public String limit_pay; //no_credit--指定不能使用信用卡支付 public String getAppid() { return appid; } public void setAppid(String appid) { this.appid = appid; } public String getMch_id() { return mch_id; } public void setMch_id(String mch_id) { this.mch_id = mch_id; } public String getNonce_str() { return nonce_str; } public void setNonce_str(String nonce_str) { this.nonce_str = nonce_str; } public String getSign() { return sign; } public void setSign(String sign) { this.sign = sign; } public String getBody() { return body; } public void setBody(String body) { this.body = body; } public String getOut_trade_no() { return out_trade_no; } public void setOut_trade_no(String out_trade_no) { this.out_trade_no = out_trade_no; } public int getTotal_fee() { return total_fee; } public void setTotal_fee(int total_fee) { this.total_fee = total_fee; } public String getSpbill_create_ip() { return spbill_create_ip; } public void setSpbill_create_ip(String spbill_create_ip) { this.spbill_create_ip = spbill_create_ip; } public String getNotify_url() { return notify_url; } public void setNotify_url(String notify_url) { this.notify_url = notify_url; } public String getTrade_type() { return trade_type; } public void setTrade_type(String trade_type) { this.trade_type = trade_type; } public String getDevice_info() { return device_info; } public void setDevice_info(String device_info) { this.device_info = device_info; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail; } public String getAttach() { return attach; } public void setAttach(String attach) { this.attach = attach; } public String getFee_type() { return fee_type; } public void setFee_type(String fee_type) { this.fee_type = fee_type; } public String getTime_start() { return time_start; } public void setTime_start(String time_start) { this.time_start = time_start; } public String getTime_expire() { return time_expire; } public void setTime_expire(String time_expire) { this.time_expire = time_expire; } public String getGoods_tag() { return goods_tag; } public void setGoods_tag(String goods_tag) { this.goods_tag = goods_tag; } public String getLimit_pay() { return limit_pay; } public void setLimit_pay(String limit_pay) { this.limit_pay = limit_pay; } } 

 if (resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) { int code = resp.errCode; switch (code) { case 0: Log.d(TAG, "onPayFinish, errCode = " + "支付成功"); //微信支付成功后去调后台，以后台返回的支付结果为准 //这里是微信支付完成后的回调，在这里请求后台，让他来告诉我们到底支付成功没。 break; case -1: Toast.makeText(this, "支付失败1", Toast.LENGTH_SHORT).show(); Log.d(TAG, "onPayFinish, errCode = " + "支付失败1"); finish(); break; case -2: Toast.makeText(this, "支付取消", Toast.LENGTH_SHORT).show(); Log.d(TAG, "onPayFinish, errCode = " + "支付取消"); finish(); break; default: //          Toast.makeText(this, "支付失败2", Toast.LENGTH_SHORT).show(); Log.d(TAG, "onPayFinish, errCode = " + "支付失败2"); setResult(RESULT_OK); finish(); break; } }