Android中怎么实现微信支付功能，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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= "";
**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
@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;
}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);
}下面给出完整代码
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();
}
}看完上述内容，你们掌握Android中怎么实现微信支付功能的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
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