一、准备工作
1、开发平台及SDK下载
微信开放平台
下载SDK
微信支付Demo下载
http://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=11_1
2、创建应用
创建移动应用获取 AppID AppSecret
要获取支付功能还需要开发者资质认证，300RMB/年的费用，貌似是开放平台中唯一要收费的…
3、AndroidMainfest文件修改
权限
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> <uses-permission android:name="android.permission.READ_PHONE_STATE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
二、业务流程
商户系统和微信支付系统主要交互说明：
步骤1：用户在商户APP中选择商品，提交订单，选择微信支付。
步骤2：商户后台收到用户支付单，调用微信支付统一下单接口。参见【统一下单API】。
步骤3：统一下单接口返回正常的prepay_id，再按签名规范重新生成签名后，将数据传输给APP。参与签名的字段名为appId，partnerId，prepayId，nonceStr，timeStamp，package。注意：package的值格式为Sign=WXPay
步骤4：商户APP调起微信支付。api参见本章节【app端开发步骤说明】
步骤5：商户后台接收支付通知。api参见【支付结果通知API】
步骤6：商户后台查询支付结果。，api参见【查询订单API】
三、开发
1、注册应用
final IWXAPI msgApi = WXAPIFactory.createWXAPI(this, null); msgApi.registerApp(Constants.APP_ID);
2、调用支付统一下单接口，并返回PrepayID
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");
show.setText(sb.toString());
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;
}
}
设置统一下单参数:
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", "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", "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;
}
}
3、设置PayReq请求的参数，并发送支付请求
//设置PayReq请求的参数
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");
show.setText(sb.toString());
Log.e("orion", signParams.toString());
}
//发送请求 msgApi.sendReq(req);
4、处理结果回调
实现微信API的IWXAPIEventHandler接口
api.handleIntent(getIntent(), new IWXAPIEventHandler);
在IWXAPIEventHandler的onResp(BaseResp resp)中处理请求回调
@Override
public void onResp(BaseResp resp) {
Log.d(TAG, "onPayFinish, errCode = " + resp.errCode);
if (resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) {
//处理PayReq的回调
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();
}
}