移动端支付之微信支付

使用环境：

需要微信支付的地方。

步骤：

1 copy支付的依赖到项目

implementation 'com.tencent.mm.opensdk:wechat-sdk-android-without-mta:+'

2 按照微信的文档指示，在项目包下写一个包名为wxapi，类名为WXPayEntryActivity

类照搬文档的就可以：

书写位置：

copy类

至于xml文件，随便写，不重要，这个类不会显示的。

package com.higo.wxapi;

import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;

import com.higo.R;
import com.higo.entity.Constants;
import com.higo.ui.activity.BaseActivity;
import com.tencent.mm.opensdk.constants.ConstantsAPI;
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;

/**
 * Created by SensYang on 2017/09/05 17:18
 */

public class WXPayEntryActivity extends BaseActivity implements IWXAPIEventHandler {

    private IWXAPI api;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_wx_pay_result);
        api = WXAPIFactory.createWXAPI(this, Constants.APP_ID_WX);
        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) {
        if (resp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) {
            if (resp.errCode == -1) {
                Toast.makeText(WXPayEntryActivity.this, "支付失败，请确认您的手机微信登录正常", Toast.LENGTH_SHORT).show();
                finishPayAct();
            } else if (resp.errCode == -2) {
                Toast.makeText(WXPayEntryActivity.this, "取消支付", Toast.LENGTH_SHORT).show();
                finishPayAct();
            } else if (resp.errCode == 0) {
                Toast.makeText(WXPayEntryActivity.this, "支付成功", Toast.LENGTH_SHORT).show();
                finishPayAct();
            }
        }
    }

    /**
     * 做一个方法返回开始支付的界面，并关闭它
     */
    public void finishPayAct() {
        finish();
    }
}

3 copy支付工具类，位置随便写


public class WXPayUtils {

    private IWXAPI iwxapi;

    private WXPayBuilder builder;

    private WXPayUtils(WXPayBuilder builder) {
        this.builder = builder;
    }

    /**
     * 调起微信支付的方法,不需要在客户端签名
     **/
    public void toWXPayNotSign(Context context) {
        //初始化微信api
        iwxapi = WXAPIFactory.createWXAPI(context, null);
        //注册appid  appid可以在开发平台获取
        iwxapi.registerApp(builder.getAppId());
        //这里注意要放在子线程
        Runnable payRunnable = new Runnable() {
            @Override
            public void run() {
                //调起微信APP的对象
                PayReq request = new PayReq();
                //下面是设置必要的参数，也就是前面说的参数,这几个参数从何而来请看上面说明
                request.appId = builder.getAppId();
                request.partnerId = builder.getPartnerId();
                request.prepayId = builder.getPrepayId();
                request.packageValue = builder.getPackageValue();
                request.nonceStr = builder.getNonceStr();
                request.timeStamp =builder.getTimeStamp();
                request.sign = builder.getSign();
                //发送调起微信的请求
                iwxapi.sendReq(request);
            }
        };
        Thread payThread = new Thread(payRunnable);
        payThread.start();
    }

    /**
     * 调起微信支付的方法,需要在客户端签名
     **/
    public void toWXPayAndSign(Context context, String appid, final String key) {
        //初始化微信api
        iwxapi = WXAPIFactory.createWXAPI(context, null);
        //注册appid  appid可以在开发平台获取
        iwxapi.registerApp(appid);
        //这里注意要放在子线程
        Runnable payRunnable = new Runnable() {
            @Override
            public void run() {
                //调起微信APP的对象
                PayReq request = new PayReq();
                //下面是设置必要的参数，也就是前面说的参数,这几个参数从何而来请看上面说明
                request.appId = builder.getAppId();
                request.partnerId = builder.getPartnerId();
                request.prepayId = builder.getPrepayId();
                request.packageValue = "Sign=WXPay";
                request.nonceStr = builder.getNonceStr();
                request.timeStamp = builder.getTimeStamp();
                request.sign = builder.getSign();
                //签名
                LinkedHashMap<String, String> signParams = new LinkedHashMap<>();
                signParams.put("appid", request.appId);
                signParams.put("noncestr", request.nonceStr);
                signParams.put("package", request.packageValue);
                signParams.put("partnerid", request.partnerId);
                signParams.put("prepayid", request.prepayId);
                signParams.put("timestamp", request.timeStamp);
                request.sign = genPackageSign(signParams, key);
                //发送调起微信的请求
                iwxapi.sendReq(request);
            }
        };
        Thread payThread = new Thread(payRunnable);
        payThread.start();
    }

    /**
     * 调起微信APP支付，签名
     * 生成签名
     */
    private String genPackageSign(LinkedHashMap<String, String> params, String key) {
        StringBuilder sb = new StringBuilder();
        for (Map.Entry<String, String> entry : params.entrySet()) {
            sb.append(entry.getKey());
            sb.append('=');
            sb.append(entry.getValue());
            sb.append('&');
        }
        sb.append("key=");
        sb.append(key);

        String packageSign = getMessageDigest(sb.toString().getBytes()).toUpperCase();
        return packageSign;
    }

    /**
     * md5加密
     *
     * @param buffer
     * @return
     */
    private String getMessageDigest(byte[] buffer) {
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(buffer);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            return null;
        }
    }

    public static class WXPayBuilder {
        String appId;
        String partnerId;
        String prepayId;
        String packageValue;
        String nonceStr;
        String timeStamp;
        String sign;

        public WXPayUtils build() {
            return new WXPayUtils(this);
        }

        public String getAppId() {
            return appId;
        }

        public WXPayBuilder setAppId(String appId) {
            this.appId = appId;
            return this;
        }

        public String getPartnerId() {
            return partnerId;
        }

        public WXPayBuilder setPartnerId(String partnerId) {
            this.partnerId = partnerId;
            return this;
        }

        public String getPrepayId() {
            return prepayId;
        }

        public WXPayBuilder setPrepayId(String prepayId) {
            this.prepayId = prepayId;
            return this;
        }

        public String getPackageValue() {
            return packageValue;
        }

        public WXPayBuilder setPackageValue(String packageValue) {
            this.packageValue = packageValue;
            return this;
        }

        public String getNonceStr() {
            return nonceStr;
        }

        public WXPayBuilder setNonceStr(String nonceStr) {
            this.nonceStr = nonceStr;
            return this;
        }

        public String getTimeStamp() {
            return timeStamp;
        }

        public WXPayBuilder setTimeStamp(String timeStamp) {
            this.timeStamp = timeStamp;
            return this;
        }

        public String getSign() {
            return sign;
        }

        public WXPayBuilder setSign(String sign) {
            this.sign = sign;
            return this;
        }
    }
}

4 联网，接收返回值，并处理微信支付问题：

微信支付的APPID 和APPKEY 大致样式如下

吊起支付代码：

 //在服务端签名
        findViewById(R.id.btn1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //假装请求了服务器 获取到了所有的数据,注意参数不能少
                WXPayUtils.WXPayBuilder builder = new WXPayUtils.WXPayBuilder();
                builder.setAppId(APPID)
                        .setPartnerId("1900006771")
                        .setPrepayId("wx3014491958518907422718666969545432")
                        .setPackageValue("Sign=WXPay")
                        .setNonceStr("51c1e88abe5a280d2b59174f10a73caa")
                        .setTimeStamp("1538290159")
                        .setSign("811FA6D2811765399147B376B6950BF4")
                        .build().toWXPayNotSign(MainActivity.this);
            }
        });
        //在客户端签名
        findViewById(R.id.btn2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //假装请求了服务端信息，并获取了appid、partnerId、prepayId，注意参数不能少
                WXPayUtils.WXPayBuilder builder = new WXPayUtils.WXPayBuilder();
                builder.setAppId(APPID)
                        .setPartnerId("1900006771")
                        .setPrepayId("wx3014491958518907422718666969545432")
                        .setPackageValue("Sign=WXPay")
                        .build()
                        .toWXPayAndSign(MainActivity.this,"微信支付的APPID","微信支付的Appkey");
            }
        });

先声明下，在服务器端签名的方法可以直接使用，但是在客户端签名需要使用APPkey我们没有可以测试的。

demo地址：https://gitee.com/longlyblack/WXPayUtils-master

demo是借鉴人家的，做了一点点修改而已，在此谢过大佬。

有任何支付的问题请联系

QQ群： 88627109

移动端支付之微信支付

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