Android WeChat payment SDK development, android payment sdk

Android payment SDK development, android payment sdk

I. Preparations

1. Download the development platform and SDK

Open Platform

Https://open.weixin.qq.com

Download SDK

Download payment Demo

Http://pay.weixin.qq.com/wiki/doc/api/app.php? Chapter = 11_1

 

2. Create an application

Create a mobile appAppIDAppSecret

Developer qualification certification is required to obtain the payment function. The fee of RMB/year seems to be the only one to be charged on the open platform...

 

3. AndroidMainfest File Modification

Permission

<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"/>

　　

Ii. Business Process

Description of interaction between the merchant System and the payment system:

Step 1: select products in the merchant APP, submit the order, and select pay.

Step 2: the merchant's background receives the user's payment order and calls the unified order payment interface. See [Unified order API ].

Step 3: The unified order interface returns the normal prepay_id, and then re-generates the signature according to the signature specification, the data is transmitted to the APP. The fields involved in the signature are appId, partnerId, prepayId, nonceStr, timeStamp, and package. Note: The package Value format is Sign = WXPay.

Step 4: The Merchant APP starts the payment. For more information about APIs, see [app development steps]

Step 5: The Merchant's background receives the payment notification. For more information about the api, see [payment result notification API]

Step 6: query the payment result at the merchant's background ., For api details, see [query order API]

 

Iii. Development

1. register an application

final IWXAPI msgApi = WXAPIFactory.createWXAPI(this, null);msgApi.registerApp(Constants.APP_ID);

　　

2. Call the unified payment order interface and return the 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;        }    }

Set unified Order Parameters:

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. Set the parameters of the PayReq request and send the payment request

// Set the 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 partition List <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"); show. setText (sb. toString (); Log. e ("orion", signParams. toString ());}

 

// Send the request msgApi. sendReq (req );

　

4. processing result callback

Implement the IWXAPIEventHandler interface of the API

Api. handleIntent (getIntent (), new IWXAPIEventHandler );

Process the request callback in the onResp (BaseResp resp) of IWXAPIEventHandler

@ Override public void onResp (BaseResp resp) {Log. d (TAG, "onPayFinish, errCode =" + resp. errCode); if (resp. getType () = ConstantsAPI. COMMAND_PAY_BY_WX) {// handle the callback AlertDialog of PayReq. 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 ();}}