Android—基于微信开放平台v3SDK开发（微信支付填坑）

package com.example.taijiapp.ui;
 
import java.io.StringReader;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
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.example.taijiapp.R;
import com.example.taijiapp.util.Constants;
import com.example.taijiapp.util.MD5;
import com.example.taijiapp.util.T;
import com.example.taijiapp.util.Util;
import com.example.taijiapp.utils.ConfigUtil;
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.ProgressDialog;
import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.util.Xml;
import android.view.View;
import android.widget.Button;
 
public class PayActivity extends Activity {
  PayReq req;
  private IWXAPI msgApi;
  Map resultunifiedorder;
  StringBuffer sb;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.pay);
    req = new PayReq();
    sb = new StringBuffer();
    msgApi = WXAPIFactory.createWXAPI(this, Constants.APP_ID);
    /**
     * 将app注册到微信
     */
    boolean registerApp = msgApi.registerApp(Constants.APP_ID);
    T.show(this, "注册========"+registerApp+"");
    Button appayBtn = (Button) findViewById(R.id.appay_btn);
    Button check_pay_btn = (Button) findViewById(R.id.check_pay_btn);
    appayBtn.setOnClickListener(new View.OnClickListener() {
 
      @Override
      public void onClick(View v) {
        GetPrepayIdTask getPrepayId = new GetPrepayIdTask();
        getPrepayId.execute();
      }
    });
    /**
     * 将该app注册到微信
     */
    check_pay_btn.setOnClickListener(new View.OnClickListener() {
 
      @Override
      public void onClick(View v) {
        genPayReq();
        sendPayReq();
         
      }
    });
//   // 生成签名参数
//   Button appay_pre_btn = (Button) findViewById(R.id.appay_pre_btn);
//   appay_pre_btn.setOnClickListener(new View.OnClickListener() {
//
//     @Override
//     public void onClick(View v) {
//       genPayReq();
//     }
//   });
  }
  /**
   * 生成签名
   */
 
  private String genPackageSign(List params) {
    StringBuilder sb = new StringBuilder();
 
    for (int i = 0; i  params) {
    StringBuilder sb = new StringBuilder();
 
    for (int i = 0; i  params) {
    StringBuilder sb = new StringBuilder();
 
    for (int i = 0; i  params) {
    StringBuilder sb = new StringBuilder();
    sb.append("");
    for (int i = 0; i ");
 
      sb.append(params.get(i).getValue());
      sb.append("");
    }
    sb.append("");
 
    Log.e("orion", sb.toString());
    return sb.toString();
  }
 
  private class GetPrepayIdTask extends AsyncTask> {
 
    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 result) {
      if (dialog != null) {
        dialog.dismiss();
      }
      sb.append("prepay_id\n" + result.get("prepay_id") + "\n\n");
 
      resultunifiedorder = result;
 
    }
 
    @Override
    protected void onCancelled() {
      super.onCancelled();
    }
 
    @Override
    protected Map doInBackground(Void... params) {
 
      String url = String.format("https://api.mch.weixin.qq.com/pay/unifiedorder");
      String entity = genProductArgs();
      Log.e("orion===发送过去", entity);
      byte[] buf = Util.httpPost(url, entity);
 
      String cOntent= new String(buf);
      Log.e("orion", content);
      Map xml = decodeXml(content);
 
      return xml;
    }
  }
 
  public Map decodeXml(String content) {
 
    try {
      Map xml = new HashMap();
      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("orion", e.toString());
    }
    return null;
 
  }
  /**
   * 生成随机数
   * @return
   */
  private String genNonceStr() {
    Random random = new Random();
    return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());
  }
  /**
   * 时间戳
   * @return
   */
  private long genTimeStamp() {
    return System.currentTimeMillis() / 1000;
  }
  /**
   * 随机数
   * @return
   */
  private String genOutTradNo() {
    Random random = new Random();
    return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());
  }
  /**
   * 获取设备的ip地址
   * @return
   */
  public String getLocalIpAddress() {
    try {
      for (Enumeration en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
        NetworkInterface intf = en.nextElement();
        for (Enumeration enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
          InetAddress inetAddress = enumIpAddr.nextElement();
          if (!inetAddress.isLoopbackAddress()) {
            return inetAddress.getHostAddress().toString();
          }
        }
      }
    } catch (SocketException ex) {
    }
    return null;
  }
 
  private String getWifiIp() {
    // 获取wifi服务
    WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    // 判断wifi是否开启
    if (!wifiManager.isWifiEnabled()) {
      wifiManager.setWifiEnabled(true);
    }
    WifiInfo wifiInfo = wifiManager.getConnectionInfo();
    int ipAddress = wifiInfo.getIpAddress();
    String ip = intToIp(ipAddress);
    return ip;
  }
  /**
   * 转化成Ip地址的格式
   * @param i
   * @return
   */
  private String intToIp(int i) {
 
    return (i & 0xFF) + "." + ((i >> 8) & 0xFF) + "." + ((i >> 16) & 0xFF) + "." + (i >> 24 & 0xFF);
  }
 
  private String genProductArgs() {
    StringBuffer xml = new StringBuffer();
    String ip = getWifiIp();
    if (ip == "" && ip == "") {
      ip = getLocalIpAddress();
    }
    try {
      String nOnceStr= genNonceStr();
      xml.append("");
      List packageParams = new LinkedList();
      packageParams.add(new BasicNameValuePair("appid", Constants.APP_ID));
      packageParams.add(new BasicNameValuePair("body", "APPtest"));
      packageParams.add(new BasicNameValuePair("mch_id", Constants.MCH_ID));
      packageParams.add(new BasicNameValuePair("nonce_str", nonceStr));
      packageParams.add(new BasicNameValuePair("notify_url", ConfigUtil.NOTIFY_URL));
      packageParams.add(new BasicNameValuePair("out_trade_no", genOutTradNo()));
      packageParams.add(new BasicNameValuePair("spbill_create_ip", ip));
      packageParams.add(new BasicNameValuePair("total_fee", "100"));
      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", "fail, ex = " + e.getMessage());
      return null;
    }
  }
 
  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 signParams = new 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");
    Log.e("orion==genPayReq===============", signParams.toString());
 
  }
 
  private void sendPayReq() {
    boolean sendReq = msgApi.sendReq(req);
    T.show(this, "微信跳转====="+sendReq+"");
  }
 
}