微信支付集成

一个app里面肯定会有支付，而绝大多数会集成微信支付，当然也不是很难，我只是将我踩过的坑填补，然后提供比较好的工具出来，方便大家使用。

GetPrepayIdTask getPrepayIdTask = new GetPrepayIdTask(this, price + "", "" + tuanbi_info, logid);                        getPrepayIdTask.execute();

这个就是开始，但是在这里那个price很关键，微信是以分为最小单位，但是不可以出现10.0这样的情况，而且最好不要使用double的数据类型，应该使用float，double数据类型会有精度丢失的问题，所以经常会看到9.99999的情况。这个是不合理的。然后我粘贴处GetPrePayIdTask：

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 android.app.ProgressDialog;import android.content.Context;import android.os.AsyncTask;import android.provider.DocumentsContract.Root;import android.util.Log;import android.util.Xml;import com.tencent.mm.opensdk.modelpay.PayReq;import com.tencent.mm.opensdk.openapi.IWXAPI;import com.tencent.mm.opensdk.openapi.WXAPIFactory;/** * Created by Administrator on 2017/4/12. * 微信支付 */public class GetPrepayIdTask extends AsyncTask> {    /**     * 微信支付业务：入参app_id     */    public static final String WXAPPID = "";    public static final String MCH_ID = "";    public static final String API_KEY = "";    private StringBuffer sb = new StringBuffer();    private Map resultunifiedorder;    private PayReq req = new PayReq();    private IWXAPI msgApi;    private Context c;    private String price;    /**     * 订单号     */    private String orderNo;    /*商品描述交易字段格式根据不同的应用场景按照以下格式：    APP——需传入应用市场上的APP名字-实际商品名称，天天爱消除-游戏充值。*/    /**     * 多个订单     */    private String orderNos;    public GetPrepayIdTask(Context c, String price, String orderNo, String orderNos) {        msgApi = WXAPIFactory.createWXAPI(c, null);        this.c = c;        this.price = price;        this.orderNo = orderNo;        this.orderNos = orderNos;    }    private ProgressDialog dialog;    @Override    protected void onPreExecute() {        dialog = ProgressDialog.show(c, "弹窗提示", "正在加载");    }    @Override    protected void onPostExecute(Map result) {        if (dialog != null) {            dialog.dismiss();        }        sb.append("prepay_id\n" + result.get("prepay_id") + "\n\n");        resultunifiedorder = result;        genPayReq();        msgApi.registerApp(WXAPPID);        msgApi.sendReq(req);    }    @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();        byte[] buf = Util.httpPost(url, entity);        String content = new String(buf);        Log.e("orion", content);        Map xml = decodeXml(content);        return xml;    }    private void genPayReq() {        req.appId = WXAPPID;        req.partnerId = MCH_ID;        //req.prepayId=Constants.API_KEY;        req.prepayId = resultunifiedorder.get("prepay_id");        req.packageValue = "Sign=WXPay";        req.nonceStr = genNonceStr();        req.timeStamp = String.valueOf(genTimeStamp());        List signParams = new LinkedList();        signParams.add(new BasicNameValuePair("appid", req.appId));        // signParams.add(new BasicNameValuePair("appkey", Constants.API_KEY));        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", signParams.toString());        // req.appId = Constants.APP_ID;        // req.partnerId = Constants.MCH_ID;        // req.prepayId="wx20150928191247ec2bfe36120916857122";        // req.packageValue = "Sign=WXPay";        // req.nonceStr="lPLaOjotrEy9MYx3";        // req.sign="10DD9C41A6857B4C4AEA98E24605925C";        // req.timeStamp="1443437278";    }    private String genAppSign(List 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(API_KEY);        this.sb.append("sign str\n" + sb.toString() + "\n\n");        String appSign = MD5.getMessageDigest(sb.toString().getBytes()).toUpperCase();        Log.e("orionAppSign", appSign);        return appSign;    }    private String genProductArgs() {        StringBuffer xml = new StringBuffer();        try {            String nonceStr = genNonceStr();            xml.append("");            List packageParams = new LinkedList();            packageParams.add(new BasicNameValuePair("appid", WXAPPID));            packageParams.add(new BasicNameValuePair("body", orderNo));            packageParams.add(new BasicNameValuePair("mch_id", MCH_ID));            packageParams.add(new BasicNameValuePair("nonce_str", nonceStr));            packageParams.add(new BasicNameValuePair("notify_url", "http://agent.quygt.com/tenpay/tenpaynotify"));//            packageParams.add(new BasicNameValuePair("notify_url", "http://lvgounet.oicp.net:24561/tenpay/tenpaynotify"));            // 订单//            packageParams.add(new BasicNameValuePair("out_trade_no", genOutTradNo(orderNos)));            packageParams.add(new BasicNameValuePair("out_trade_no", orderNos));            // 订单价格//            long total_fee = (long) (1);            // 订单            packageParams.add(new BasicNameValuePair("spbill_create_ip", "127.0.0.1"));            packageParams.add(new BasicNameValuePair("total_fee", price));//            Log.e("sjdfajsadf", "==============="+price );//            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 new String(xmlstring.toString().getBytes(), "ISO8859-1");//这句加上就可以了吧xml转码下//            return xmlstring;        } catch (Exception e) {            // Log.e(TAG, "genProductArgs fail, ex = " + e.getMessage());            return null;        }    }    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;    }    private String genNonceStr() {        Random random = new Random();        return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());    }    private long genTimeStamp() {        return System.currentTimeMillis() / 1000;    }    /**     * 生成签名     */    private String genPackageSign(List 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(API_KEY);        String packageSign = MD5.getMessageDigest(sb.toString().getBytes())                .toUpperCase();        Log.e("orionStringBuilder", sb.toString());        Log.e("orionAppMd5", packageSign);        return packageSign;    }    private String toXml(List params) {        StringBuilder sb = new StringBuilder();        sb.append("");        for (int i = 0; i < params.size(); i++) {            sb.append("<" + params.get(i).getName() + ">");            sb.append(params.get(i).getValue());            sb.append("");        }        sb.append("");        Log.e("orionsdsd", sb.toString());//new String(sb2.toString().getBytes(), "ISO8859-1")        return sb.toString();    }    /**     * 订单号信息     *     * @return     */    private String genOutTradNo(String orderNos) {        // Random random = new Random();        return MD5.getMessageDigest(String.valueOf(orderNos).getBytes());    }}

这里就是将spbill_create_ip这个参数的ip设置为固定值，这样会大大减少请求的时间。

还有使用微信支付，一定要在自己项目里新建一个位置为wxapi，还要新建WXPayEntryActivity这样一个类，

import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import com.lvgou.distribution.utils.MyToast;import android.widget.Toast;import com.lvgou.distribution.R;import com.lvgou.distribution.activity.BaseActivity;import com.lvgou.distribution.activity.RechargeRecordListActivity;import com.lvgou.distribution.presenter.TuanbiExchangePresenter;import com.lvgou.distribution.utils.TGmd5;import com.lvgou.distribution.view.GroupView;import com.tencent.mm.opensdk.modelbase.BaseReq;import com.tencent.mm.opensdk.modelbase.BaseResp;import com.tencent.mm.opensdk.openapi.IWXAPI;import com.tencent.mm.opensdk.openapi.IWXAPIEventHandler;import com.tencent.mm.opensdk.openapi.WXAPIFactory;import org.greenrobot.eventbus.EventBus;/** * Created by Administrator on 2017/4/11. */public class WXPayEntryActivity extends BaseActivity implements IWXAPIEventHandler, GroupView {    private TuanbiExchangePresenter tuanbiExchangePresenter;    private static final String TAG = "MicroMsg.SDKSample.WXPayEntryActivity";    /**     * 微信支付业务：入参app_id     */    public static final String WXAPPID = "";    private IWXAPI api;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.pay_result);        tuanbiExchangePresenter = new TuanbiExchangePresenter(this);        api = WXAPIFactory.createWXAPI(this, WXAPPID);        api.handleIntent(getIntent(), this);    }    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        setIntent(intent);        api.handleIntent(intent, this);    }    @Override    public void onReq(BaseReq req) {    }    @Override    public void onResp(BaseResp resp) {        int errCode = resp.errCode;        if (errCode == 0) {            //0 成功 展示成功页面//            MyToast.makeText(this, "支付成功", Toast.LENGTH_SHORT).show();            /*Intent intent = new Intent(Constant.ACTION_NAME);            sendBroadcast(intent);*/            showLoadingProgressDialog(this, "");            String logid = mcache.getAsString("wxlogid");            String sign = TGmd5.getMD5(logid + "1" + "-");            tuanbiExchangePresenter.doAlipay(logid, "1", "-", sign);        } else if (errCode == -1) {            //-1 错误 可能的原因：签名错误、未注册APPID、项目设置APPID不正确、注册的APPID与设置的不匹配、其他异常等。            MyToast.makeText(this, "支付失败", Toast.LENGTH_SHORT).show();            showLoadingProgressDialog(this, "");            String logid = mcache.getAsString("wxlogid");            String sign = TGmd5.getMD5(logid + "0" + resp.errStr);            tuanbiExchangePresenter.doAlipay(logid, "0", resp.errStr, sign);        } else if (errCode == -2) {            //-2 用户取消 无需处理。发生场景：用户不支付了，点击取消，返回APP。            MyToast.makeText(this, "取消支付", Toast.LENGTH_SHORT).show();            finish();        }    }    @Override    public void OnFamousSuccCallBack(String state, String respanse) {        closeLoadingProgressDialog();//        MyToast.makeText(this, "=" + respanse, Toast.LENGTH_SHORT).show();//        Log.e("kjhaskfhs", "===========" + respanse);        openActivity(RechargeRecordListActivity.class);        EventBus.getDefault().post("rechargesuccess");        finish();//        finish();    }    @Override    public void OnFamousFialCallBack(String state, String respanse) {        closeLoadingProgressDialog();//        Log.e("kjhaskfhs", "**********" + respanse);//        MyToast.makeText(this, "*" + respanse, Toast.LENGTH_SHORT).show();    }    @Override    public void closeProgress() {    }    @Override    public void showProgress() {    }}

其实就这么简单，但是没有集成过微信支付可能会走弯路，可能会被它的xml拼接和xml解析给困惑，现在这只是我的一种处理方式，有更好的希望大家给给意见。