Android集成微信支付

Android集成微信支付
微信支付和支付宝支付一样的，都可以在客户端发起支付并成功通过，但这样做的漏洞比较大，所以一定不要通过客户端直接来完成

1.首先需要 在客户端向服务器发起一个微信预支付操作：

请求参数如下：

body.put("loginUserId", loginUserId );body.put("title", title);body.put("business", business);body.put("orderId", orderId);body.put("charges", charges); //  注意这里的金额是要在实际金额*100body.put("employeeId", employeeId);body.put("WXAppId", Const.WX_APP_ID);

微信预支付操作处理后可以从微信服务器获取一个预支付id，然后再通过预支付id真正发起微信支付操作.

 WXPayUtil payUtil = new WXPayUtil(mActivity); payUtil.doPayReq(bean.prepay_id); ``` 具体代码放一下，反正也没有什么机密 ``` public class WXPayUtil {    private PayReq req = null;    private IWXAPI msgApi = null;    private StringBuffer sb = null;    public WXPayUtil(final Activity activity) {        this.req = new PayReq();        this.msgApi = WXAPIFactory.createWXAPI(activity, null);        this.msgApi.registerApp(Constants.APP_ID);        this.sb = new StringBuffer();    }    /**     * @work:生成签名参数     * @date:2015-9-7 上午11:48:04     * @author:[e-mail]     * @params:     */    public void doPayReq(String prePayId) {        req.appId = Constants.APP_ID;        req.partnerId = Constants.MCH_ID;        req.prepayId = prePayId;        req.packageValue = "Sign=WXPay";        req.nonceStr = genNonceStr();        req.timeStamp = String.valueOf(genTimeStamp());        List<NameValuePair> 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");        sendPayReq();    }    /**     * @work:启动支付     * @date:2015-9-7 上午11:49:51     * @author:[e-mail]     */    private void sendPayReq() {        msgApi.registerApp(Constants.APP_ID);        msgApi.sendReq(req);    }    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()).toUpperCase();        return appSign;    }    private String genNonceStr() {        Random random = new Random();        return MD5.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());    }    private long genTimeStamp() {        return System.currentTimeMillis() / 1000;    }

然后微信的操作如下：

public class WXPayEntryActivity extends Activity implements IWXAPIEventHandler{    /***微信支付结果*/    public static int mWXPayResult = -1;    private static final String TAG = "MicroMsg.SDKSample.WXPayEntryActivity";    private IWXAPI api;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.pay_result);        api = WXAPIFactory.createWXAPI(this, Constants.APP_ID);        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) {            mWXPayResult = resp.errCode;            if (resp.errCode == 0) //支付成功，            {                   BToast.show(this, "支付成功!");                finish();            } else if(resp.errCode == -1) { //支付失败                BToast.show(this, "支付错误");                finish();            }else if(resp.errCode == -2){//取消支付                BToast.show(this, "您已经取消了支付！");                finish();            }        }    }}

这里我有一个全局静态变量mWXPayResult来标记微信支付是否成功的状态.

  mPayBean.payResult = WXPayEntryActivity.mWXPayResult == 0;                if (mPayBean.payResult) {                    doSubmit();                } 

这个时候微信支付就处理完毕.