Android支付实践（二）之微信支付详解与Demo

来源：互联网发布：sqlyog查看数据库密码编辑：程序博客网时间：2024/05/21 06:19

最近公司弄Ionic框架，项目中需要微信支付，无奈，把我调过去弄，期间也是几近崩溃，好在皇天不负有心人，在看别人的文档，终于是在项目中集成了微信支付，下面作为一个小白的我，想要把我的经验分享给大家，希望对大家有所帮助。

温馨提示：大家下载下来可能会出错，也有可能不会。下面给出出错的解决方法：1.进入项目中的WeIXinPay->Build Path->configure build path，移除那个报错的jar包。 2.会出现资源找不到的情况，这是因为你没有v7包，下载一个v7包，或者把出错的地方都删除，只是一个主题，删除了看起来不好看而已，当然，你也可以用你有的主题。还有一个问题需要提出来，就是你可能按照里面的text操作的仍然调不起客户端，有可能是你没有安装微信客户端，因为我没有做判断。这个demo不会出现只能成功支付一次的情况，博主亲测有效。出现只能支付一次只能说明你的签名没有对应）

先看下效果图：

1.去微信开放平台申请微信支付服务，绑定自己的应用这里具体不多讲，但是一定要申请完成，将会得到是三个参数

//appid 微信分配的公众账号IDpublic static final String APP_ID = "";//商户号 微信分配的公众账号IDpublic static final String MCH_ID = "";//API密钥，在商户平台设置public static final  String API_KEY= "";

坑点提示：在微信开发平台设置包名和签名。这里的包名一定要和你自己的包名一样，就是manifest中的package,签名一定要和你用官方app生成的一样(https://open.weixin.qq.com/zh_CN/htmledition/res/dev/download/sdk/Gen_Signature_Android.apk)。
微信会根据你的填写的包名，然后对你的keystore进行一种算法，生成你的签名。包名和签名一定要和微信开放平台的相同。不过这里需要注意的是，如果你发布的正式版本，需要用官方app重新生成签名，然后在开放平台重新设置sign，因为测试版本的keystore与正式版的keystore不一样。总之，就是你用的keystore生成的sign要和微信开放平台的时刻保持一致。

2.准备工作做好了，接下来就是开发了，先下载微信的jar包，导入。
微信支付分为三个步骤
1.生成prepayId

@Overrideprotected Map<String, String> doInBackground(String... params) {     String url=String.format(params[0]);     String entity=getProductArgs();     Log.e("Simon",">>>>"+entity);     byte[] buf=Util.httpPost(url, entity);     String content = new String(buf);     Log.e("orion", "----"+content);     Map<String,String> xml=decodeXml(content);     return xml;}

2.生成签名参数

private void genPayReq() {        req.appId = Constants.APP_ID;        req.partnerId = Constants.MCH_ID;        if (resultunifiedorder!=null) {            req.prepayId = resultunifiedorder.get("prepay_id");            req.packageValue = "prepay_id="+resultunifiedorder.get("prepay_id");        }        else {            Toast.makeText(MainActivity.this, "prepayid为空", Toast.LENGTH_SHORT).show();        }        req.nonceStr = getNonceStr();        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");        textView.setText(sb.toString());        Log.e("Simon", "----"+signParams.toString());    }

3.调起支付

/* * 调起微信支付 */private void sendPayReq() {    msgApi.registerApp(Constants.APP_ID);    msgApi.sendReq(req);    Log.i(">>>>>", req.partnerId);}

完整代码:

package com.alpha.live;import java.io.StringReader;import java.util.HashMap;import java.util.LinkedList;import java.util.List;import java.util.Map;import java.util.Random;import org.apache.http.NameValuePair;import org.apache.http.message.BasicNameValuePair;import org.xmlpull.v1.XmlPullParser;import com.tencent.mm.sdk.modelpay.PayReq;import com.tencent.mm.sdk.openapi.IWXAPI;import com.tencent.mm.sdk.openapi.WXAPIFactory;import android.app.Activity;import android.app.AlertDialog;import android.app.ProgressDialog;import android.os.AsyncTask;import android.os.Bundle;import android.util.Log;import android.util.Xml;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;/** * Created by Simon on 2016/12/2. */public class MainActivity extends Activity implements OnClickListener {    private Button submitButton;    private Button confirmButton;    private TextView textView;    private StringBuffer sb;    private Map<String,String> resultunifiedorder;    private PayReq req;    private final IWXAPI msgApi = WXAPIFactory.createWXAPI(this, null);    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        submitButton=(Button) findViewById(R.id.bt_submit_order);        confirmButton=(Button) findViewById(R.id.bt_corfirm);        textView=(TextView) findViewById(R.id.tv_prepay_id);        submitButton.setOnClickListener(this);        confirmButton.setOnClickListener(this);        sb=new StringBuffer();        req=new PayReq();    }    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        switch (v.getId()) {        case R.id.bt_submit_order:            String urlString="https://api.mch.weixin.qq.com/pay/unifiedorder";             PrePayIdAsyncTask prePayIdAsyncTask=new PrePayIdAsyncTask();             prePayIdAsyncTask.execute(urlString);      //生成prepayId        break;        case R.id.bt_corfirm:            genPayReq();//生成签名参数            sendPayReq();//调起支付        break;        default:            break;        }    }    /*     * 调起微信支付     */    private void sendPayReq() {        msgApi.registerApp(Constants.APP_ID);        msgApi.sendReq(req);        Log.i(">>>>>", req.partnerId);    }    private long genTimeStamp() {        return System.currentTimeMillis() / 1000;    }    private void genPayReq() {        req.appId = Constants.APP_ID;        req.partnerId = Constants.MCH_ID;        if (resultunifiedorder!=null) {            req.prepayId = resultunifiedorder.get("prepay_id");            req.packageValue = "prepay_id="+resultunifiedorder.get("prepay_id");        }        else {            Toast.makeText(MainActivity.this, "prepayid为空", Toast.LENGTH_SHORT).show();        }        req.nonceStr = getNonceStr();        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");        textView.setText(sb.toString());        Log.e("Simon", "----"+signParams.toString());    }    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());        Log.e("Simon","----"+appSign);        return appSign;    }    private class PrePayIdAsyncTask extends AsyncTask<String,Void, Map<String, String>>    {        private ProgressDialog dialog;        @Override        protected void onPreExecute() {            // TODO Auto-generated method stub            super.onPreExecute();            dialog = ProgressDialog.show(MainActivity.this, "提示", "正在提交订单");        }        @Override        protected Map<String, String> doInBackground(String... params) {            // TODO Auto-generated method stub            String url=String.format(params[0]);            String entity=getProductArgs();            Log.e("Simon",">>>>"+entity);            byte[] buf=Util.httpPost(url, entity);            String content = new String(buf);            Log.e("orion", "----"+content);            Map<String,String> xml=decodeXml(content);            return xml;        }        @Override        protected void onPostExecute(Map<String, String> result) {            // TODO Auto-generated method stub            super.onPostExecute(result);            if (dialog != null) {                dialog.dismiss();            }            sb.append("prepay_id\n"+result.get("prepay_id")+"\n\n");            textView.setText(sb.toString());            resultunifiedorder=result;        }    }    public Map<String,String> decodeXml(String content) {        try {            Map<String, String> xml = new HashMap<String, String>();            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)==false){                        //实例化student对象                        xml.put(nodeName,parser.nextText());                    }                    break;                case XmlPullParser.END_TAG:                    break;                }                event = parser.next();            }            return xml;        } catch (Exception e) {            Log.e("Simon","----"+e.toString());        }        return null;    }    private String getProductArgs() {        // TODO Auto-generated method stub        StringBuffer xml=new StringBuffer();        try {            String nonceStr=getNonceStr();            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", "https://www.baidu.com"));//写你们的回调地址            packageParams.add(new BasicNameValuePair("out_trade_no",genOutTradNo()));            packageParams.add(new BasicNameValuePair("total_fee", "1"));            packageParams.add(new BasicNameValuePair("trade_type", "APP"));            String sign=getPackageSign(packageParams);            packageParams.add(new BasicNameValuePair("sign", sign));            String xmlString=toXml(packageParams);            return xmlString;        } catch (Exception e) {            // TODO: handle exception            return null;        }    }    //生成订单号,测试用，在客户端生成    private String genOutTradNo() {        Random random = new Random();//      return "dasgfsdg1234"; //订单号写死的话只能支付一次，第二次不能生成订单        return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());    }    //生成随机号，防重发    private String getNonceStr() {        // TODO Auto-generated method stub        Random random=new Random();        return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());    }    /**     生成签名     */    private String getPackageSign(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);        String packageSign = MD5.getMessageDigest(sb.toString().getBytes()).toUpperCase();        Log.e("Simon",">>>>"+packageSign);        return packageSign;    }    /*     * 转换成xml     */    private String toXml(List<NameValuePair> params) {        StringBuilder sb = new StringBuilder();        sb.append("<xml>");        for (int i = 0; i < params.size(); i++) {            sb.append("<"+params.get(i).getName()+">");            sb.append(params.get(i).getValue());            sb.append("</"+params.get(i).getName()+">");        }        sb.append("</xml>");        Log.e("Simon",">>>>"+sb.toString());        return sb.toString();    }}

转载自:http://blog.csdn.net/Simon_Crystin/

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