微信支付

微信支付的调用是比较简单的，总体来说是这样的：

在微信官网上申请权限：主要是三个参数：

//appid 微信分配的公众账号ID
public static final String APP_ID ="";

//商户号 微信分配的公众账号ID
public static final String MCH_ID ="";

//  API密钥，在商户平台设置
public static final  String API_KEY= "";

前两个是微信给我们的参数。第三个是API_KEY在微信的商户平台上自己设定的。

有了这三个参数后台就可以为我们申请数据给我们返回7个参数了：



这七个参数的prepayid是必须后台给我们的其他的可以在app上自己生成，具体的生成过程看官网的带帽。

我再、在座的时候sign是后台返回的发现，支付不成功，我自己在app上又生成了一次，结果成功了，不知为何。

讲这七个参数加到req上就可以发起请求了。

支付结束后会回调一个activity： WXPayEntryActivity，注意这个activity的包名必须为，系统包名.wxapi这是必须的。

下面是一个带帽的主函数：

package net.sourceforge.simcpux;

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 com.chinat2t21829ys.templt.R;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.xmlpull.v1.XmlPullParser;
import android.app.Activity;
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.widget.Button;
import android.widget.TextView;

import com.tencent.mm.sdk.modelpay.PayReq;
import com.tencent.mm.sdk.openapi.IWXAPI;
import com.tencent.mm.sdk.openapi.WXAPIFactory;

public class PayActivity extends Activity {

private static final String TAG = "MicroMsg.SDKSample.PayActivity";

PayReq req;
final IWXAPI msgApi = WXAPIFactory.createWXAPI(this, null);
TextView show;
Map<String,String> resultunifiedorder;
StringBuffer sb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pay);
show =(TextView)findViewById(R.id.editText_prepay_id);
req = new PayReq();
sb=new StringBuffer();

//生成prepay_id
Button payBtn = (Button) findViewById(R.id.unifiedorder_btn);
payBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
GetPrepayIdTask getPrepayId = new GetPrepayIdTask();
getPrepayId.execute();
}
});
//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();
}
});
//      调起微信支付
Button appayBtn = (Button) findViewById(R.id.appay_btn);
appayBtn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
sendPayReq();
}
});

}

/**
生成签名
*/

private String genPackageSign(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('&');
//ni shuo w rong yi ma  shangbeizi qian nid
}
sb.append("key=");
sb.append(Constants.API_KEY);

String packageSign = MD5.getMessageDigest(sb.toString().getBytes()).toUpperCase();
Log.e("orion","----"+packageSign);
return packageSign;
}
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("orion","----"+appSign);
return appSign;
}
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("orion","----"+sb.toString());
return sb.toString();
}

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;
}
}

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("orion","----"+e.toString());
}
return null;

}

private String genNonceStr() {
Random random = new Random();
return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());
}

private long genTimeStamp() {
return System.currentTimeMillis() / 1000;
}

private String genOutTradNo() {
Random random = new Random();
//      return "COATBAE810"; //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());
}

//
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", "2000000"));
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;
}

}
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.packageValue = "WXPay";
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());

}
private void sendPayReq() {

msgApi.registerApp(Constants.APP_ID);
msgApi.sendReq(req);
}

}

这是官方的带帽，所用参数都是在本地生成的。