Android实现微信支付功能

jerry Android 2016年03月10日 收藏

开发Android APP微信支付功能,需要完成三个步骤:第一步生成预支付订单、第二步生成微信支付参数、第三步调起微信APP支付。除了需要审核通过的APP应用外,还需要获得微信支付接口权限,然后获取对应的商户号、API密钥,这两者缺一不可,并且在APP微信支付中使用

获得商户号、API密钥

在微信开放平台中查看审核通过的APP应用,是否申请支付功能,若已申请,登录微信支付|商户平台:http://pay.weixin.qq.com 查看对应的商户号、API密钥

》申请微信支付接口

》登录商户平台

》查看商户号

》获取API密钥

第一步:生成预支付订单

将商品信息、商户信息使用BasicNameValuePair存放,然后存储在List列表中,并构造成xml字符串格式,以POST方式微信提供的接口:https://api.mch.weixin.qq.com/pay/unifiedorder 发送数据,接收返回信息,获取prepay_id预支付订单编号

》生成订单请求

private String genProductArgs() { 
    StringBuffer xml = new StringBuffer(); 
 
    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", "weixin")); 
      packageParams 
          .add(new BasicNameValuePair("mch_id", Constants.MCH_ID)); 
      packageParams.add(new BasicNameValuePair("nonce_str", nonceStr)); 
      packageParams.add(new BasicNameValuePair("notify_url", 
          "http://121.40.35.3/test")); 
      packageParams.add(new BasicNameValuePair("out_trade_no", 
          genOutTradNo())); 
      packageParams.add(new BasicNameValuePair("spbill_create_ip", 
          "127.0.0.1")); 
      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, "genProductArgs fail, ex = " + e.getMessage()); 
      return null; 
    } 
 
  } 

》获取预支付订单编号

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); 

第二步:生成微信支付参数

appId对应APP应用的APPID,partnerId对应商户号,prepayId对应第一步获得的预支付订单,packageValue取值Sign=WXPay,nonceStr是一串随机数,timeStamp生成的时间戳,sign对应APP签名

》支付参数配置

private void genPayReq() { 
 
    req.appId = Constants.APP_ID; 
    req.partnerId = Constants.MCH_ID; 
    req.prepayId = resultunifiedorder.get("prepay_id"); 
    req.packageValue = "Sign=WXPay"; 
    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"); 
 
    show.setText(sb.toString()); 
 
    Log.e("orion", signParams.toString()); 
 
  } 

 》nonceStr随机数

private String genNonceStr() { 
    Random random = new Random(); 
    return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)) 
        .getBytes()); 
  } 

》timeStamp时间戳

private long genTimeStamp() { 
    return System.currentTimeMillis() / 1000; 
  } 

》APP签名

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()) 
        .toUpperCase(); 
    Log.e("orion", appSign); 
    return appSign; 
  } 

第三步:调起微信APP支付

支付之前,需要手机安装微信客户端,如果没有,会提示下载安装微信,然后再调起支付,在AndroidManifest.xml文件中添加如下配置

<activity 
      android:name=".act.PayActivity" 
      android:exported="true" 
      android:launchMode="singleTop" > 
      <intent-filter> 
        <action android:name="android.intent.action.VIEW" /> 
 
        <category android:name="android.intent.category.DEFAULT" /> 
 
        <data android:scheme="wxf2f565574a968187" /> 
      </intent-filter> 
    </activity> 

》调起微信支付

private void sendPayReq() { 
 
    msgApi.registerApp(Constants.APP_ID); 
    msgApi.sendReq(req); 
  } 

接收微信返回结果

在实现了IWXAPIEventHandler接口的Activity中重写onResp(BaseResp)方法,接收微信结果

》接收支付结果

public void onResp(BaseResp resp) { 
    Log.d(TAG, "onPayFinish, errCode = " + resp.errCode); 
 
    if (resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) { 
      AlertDialog.Builder builder = new AlertDialog.Builder(this); 
      builder.setTitle(R.string.app_tip); 
      builder.setMessage(getString(R.string.pay_result_callback_msg, 
          resp.errStr + ";code=" + String.valueOf(resp.errCode))); 
      builder.show(); 
    } 
  } 

以上就是本文的全部内容,希望对大家的学习有所帮助。