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
style="margin: 0px; padding: 0px; border: currentcolor; width: 100%; height: 74px; vertical-align: baseline; display: block; position: static;" vspace="0" frameborder="0" allowtransparency="true" scrolling="no" hspace="0">
》登录商户平台
》查看商户号
》获取API密钥
style="margin: 0px; padding: 0px; border: currentcolor; width: 100%; height: 104px; vertical-align: baseline; display: block; position: static;" vspace="0" frameborder="0" allowtransparency="true" scrolling="no" hspace="0">
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
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private String genProductArgs() {
StringBuffer xml = new StringBuffer();
try {
String nonceStr = genNonceStr();
xml.append("");
Listnew LinkedList
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;
}
}
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》获取预支付订单编号
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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
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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
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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());
Listnew LinkedList
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());
}
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》nonceStr随机数
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private String genNonceStr() {
Random random = new Random();
return MD5.getMessageDigest(String.valueOf(random.nextInt(10000))
.getBytes());
}
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》timeStamp时间戳
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private long genTimeStamp() {
return System.currentTimeMillis() / 1000;
}
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》APP签名
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private String genAppSign(List
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;
}
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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
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android:name=".act.PayActivity"
android:exported="true"
android:launchMode="singleTop" >
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》调起微信支付
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private void sendPayReq() {
msgApi.registerApp(Constants.APP_ID);
msgApi.sendReq(req);
}
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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
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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();
}
}
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