最近項目中需要用到分享與支付，為了省事就直接使用了友盟的SDK。友盟的配置在這里就不多提了，按照官方文檔來就可以了。微信支付的前提是獲取到支付的功能，至于微信的添加商戶，合作伙伴那些網(wǎng)上有很多，也不多說了。下面主要說說支付的事:
1.在我們的項目中，需要使用帶支付的微信包http://dev.umeng.com/social/android/quick-integration

Paste_Image.png

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3.服務(wù)器生成預(yù)支付訂單等信息傳遞到App，需要在App端做二次簽名后才能掉起微信支付。下面貼代碼

private void invokeWxPay() {
        PayReq req = new PayReq();

        req.appId = Constants.WX_APPID;                         //微信開放平臺審核通過的應(yīng)用APPID
        req.partnerId = partner_id;                             //微信支付分配的商戶號
        req.prepayId = prepay_id;                               //預(yù)支付交易會話ID
        req.nonceStr = nonce_str;                               //隨機字符串，不長于32位。
        req.timeStamp = System.currentTimeMillis()/1000 + "";   //時間戳
        req.packageValue = "Sign=WXPay";                        //擴(kuò)展字段 暫填寫固定值Sign=WXPay
        req.sign = WXUtil.genPayReq(req);                       //二次簽名

        api.sendReq(req);
    }

Util的代碼

public class WXUtil {


    /**
     * 獲取sign簽名
     *
     * @return
     */
    public static String genPayReq( PayReq request ) {

        // 把參數(shù)的值傳進(jìn)去SortedMap集合里面
        SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
//      {appid=wx34df375d7dae8c90, noncestr=3BF34EF2CA4A462DB8D4EA48E785CDC3,
//              package=Sign=WXPay, partnerid=1349967601,
//              prepayid=wx2016070910354542c7155d4e0846850809, timestamp=1468031760}
        parameters.put("appid", request.appId);
        parameters.put("noncestr", request.nonceStr);
        parameters.put("package", request.packageValue);
        parameters.put("partnerid", request.partnerId);
        parameters.put("prepayid", request.prepayId);
        parameters.put("timestamp", request.timeStamp);

        String characterEncoding = "UTF-8";
        String mySign = createSign(characterEncoding, parameters);
        Debug.e("--------我的簽名-----" + mySign);
        return mySign;
    }

    /**
     * 微信支付簽名算法sign
     * @param characterEncoding
     * @param parameters
     * @return
     */
    @SuppressWarnings("unchecked")
    private static String createSign(String characterEncoding, SortedMap<Object,Object> parameters){
        StringBuffer sb = new StringBuffer();
        Set es = parameters.entrySet();//所有參與傳參的參數(shù)按照ASCII排序（升序）
        Iterator it = es.iterator();
        while(it.hasNext()) {
            Map.Entry entry = (Map.Entry)it.next();
            String k = (String)entry.getKey();
            Object v = entry.getValue();
            if(null != v && !"".equals(v)
                    && !"sign".equals(k) && !"key".equals(k)) {
                sb.append(k + "=" + v + "&");
            }
        }
        sb.append("key="+ Constants.WX_KEY);
        String sign = MD5Encode(sb.toString(), characterEncoding).toUpperCase();
        return sign;
    }

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    private static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString
                        .getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString;
    }

    private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
}

只要微信的配置正確，這樣就可以開啟微信支付之旅了。