在做Android支付的時候肯定會用到支付寶支付， 根據(jù)官方給出的demo做起來非常費勁，所以我們需要一次簡單的封裝。 封裝的代碼也很簡單，就是將官網(wǎng)給的demo提取出一個類來方便使用。

/** * 支付寶支付 * * @author lenovo */public class Alipay { // 商戶PID public static final String PARTNER = '123456789'; // 商戶收款賬號 public static final String SELLER = 'qibin0506@gmail.com'; // 商戶私鑰，pkcs8格式 public static final String RSA_PRIVATE = 'rsa_private'; // 支付寶公鑰 public static final String RSA_PUBLIC = 'rsa_public'; private static final int SDK_PAY_FLAG = 1; private WeakReference<Activity> mActivity; private OnAlipayListener mListener; public Alipay(Activity activity) {mActivity = new WeakReference<Activity>(activity); } @SuppressLint('HandlerLeak') private Handler mHandler = new Handler() {public void handleMessage(Message msg) { if (msg.what == SDK_PAY_FLAG) {PayResult payResult = new PayResult((String) msg.obj);// 支付寶返回此次支付結(jié)果及加簽，建議對支付寶簽名信息拿簽約時支付寶提供的公鑰做驗簽String resultInfo = payResult.getResult();String resultStatus = payResult.getResultStatus();// 判斷resultStatus 為“9000”則代表支付成功，具體狀態(tài)碼代表含義可參考接口文檔if (TextUtils.equals(resultStatus, '9000')) { if (mListener != null) mListener.onSuccess();} else { // 判斷resultStatus 為非“9000”則代表可能支付失敗 // “8000”代表支付結(jié)果因為支付渠道原因或者系統(tǒng)原因還在等待支付結(jié)果確認， // 最終交易是否成功以服務(wù)端異步通知為準(zhǔn)（小概率狀態(tài)） if (TextUtils.equals(resultStatus, '8000')) {if (mListener != null) mListener.onWait(); } else {// 其他值就可以判斷為支付失敗，包括用戶主動取消支付，或者系統(tǒng)返回的錯誤if (mListener != null) mListener.onCancel(); }} }} }; /** * 支付 * * @param title 標(biāo)題 不能為空或者“” * @param desc 描述 不能為空或者“” * @param price 價格 不能為空或者“” * @param sn 商品唯一貨號 不能為空或者“” * @param url 服務(wù)器回調(diào)url 不能為空或者“” */ public void pay(String title, String desc, String price, String sn, String url) {// 訂單String orderInfo = getOrderInfo(title, desc, price, sn, url);// 對訂單做RSA 簽名String sign = sign(orderInfo);try { // 僅需對sign 做URL編碼 sign = URLEncoder.encode(sign, 'UTF-8');} catch (UnsupportedEncodingException e) { e.printStackTrace();}// 完整的符合支付寶參數(shù)規(guī)范的訂單信息final String payInfo = orderInfo + '&sign='' + sign + ''&'+ getSignType();Runnable payRunnable = new Runnable() { @Override public void run() {Activity activity = mActivity.get();if(activity == null) return;// 構(gòu)造PayTask 對象PayTask alipay = new PayTask(activity);// 調(diào)用支付接口，獲取支付結(jié)果String result = alipay.pay(payInfo);Message msg = new Message();msg.what = SDK_PAY_FLAG;msg.obj = result;mHandler.sendMessage(msg); }};// 必須異步調(diào)用Thread payThread = new Thread(payRunnable);payThread.start(); } /** * create the order info. 創(chuàng)建訂單信息 * */ public String getOrderInfo(String subject, String body, String price, String sn, String url) {// 簽約合作者身份IDString orderInfo = 'partner=' + ''' + PARTNER + ''';// 簽約賣家支付寶賬號orderInfo += '&seller_id=' + ''' + SELLER + ''';// 商戶網(wǎng)站唯一訂單號orderInfo += '&out_trade_no=' + ''' + sn + ''';// 商品名稱orderInfo += '&subject=' + ''' + subject + ''';// 商品詳情orderInfo += '&body=' + ''' + body + ''';// 商品金額orderInfo += '&total_fee=' + ''' + price + ''';// 服務(wù)器異步通知頁面路徑orderInfo += '&notify_url=' + ''' + url + ''';// 服務(wù)接口名稱， 固定值orderInfo += '&service='mobile.securitypay.pay'';// 支付類型， 固定值orderInfo += '&payment_type='1'';// 參數(shù)編碼， 固定值orderInfo += '&_input_charset='utf-8'';// 設(shè)置未付款交易的超時時間// 默認30分鐘，一旦超時，該筆交易就會自動被關(guān)閉。// 取值范圍：1m～15d。// m-分鐘，h-小時，d-天，1c-當(dāng)天（無論交易何時創(chuàng)建，都在0點關(guān)閉）。// 該參數(shù)數(shù)值不接受小數(shù)點，如1.5h，可轉(zhuǎn)換為90m。orderInfo += '&it_b_pay='30m'';// extern_token為經(jīng)過快登授權(quán)獲取到的alipay_open_id,帶上此參數(shù)用戶將使用授權(quán)的賬戶進行支付// orderInfo += '&extern_token=' + ''' + extern_token + ''';// 支付寶處理完請求后，當(dāng)前頁面跳轉(zhuǎn)到商戶指定頁面的路徑，可空orderInfo += '&return_url='m.alipay.com'';// 調(diào)用銀行卡支付，需配置此參數(shù)，參與簽名， 固定值 （需要簽約《無線銀行卡快捷支付》才能使用）// orderInfo += '&paymethod='expressGateway'';return orderInfo; } /** * sign the order info. 對訂單信息進行簽名 * * @param content * 待簽名訂單信息 */ public String sign(String content) {return SignUtils.sign(content, RSA_PRIVATE); } /** * get the sign type we use. 獲取簽名方式 * */ public String getSignType() {return 'sign_type='RSA''; } public void setListener(OnAlipayListener l) {mListener = l; } /** * 支付回調(diào)接口 * * @author lenovo * */ public static class OnAlipayListener {/** * 支付成功 */public void onSuccess() {}/** * 支付取消 */public void onCancel() {}/** * 等待確認 */public void onWait() {} }}final class Base64 { private static final int BASELENGTH = 128; private static final int LOOKUPLENGTH = 64; private static final int TWENTYFOURBITGROUP = 24; private static final int EIGHTBIT = 8; private static final int SIXTEENBIT = 16; private static final int FOURBYTE = 4; private static final int SIGN = -128; private static char PAD = ’=’; private static byte[] base64Alphabet = new byte[BASELENGTH]; private static char[] lookUpBase64Alphabet = new char[LOOKUPLENGTH]; static {for (int i = 0; i < BASELENGTH; ++i) { base64Alphabet[i] = -1;}for (int i = ’Z’; i >= ’A’; i--) { base64Alphabet[i] = (byte) (i - ’A’);}for (int i = ’z’; i >= ’a’; i--) { base64Alphabet[i] = (byte) (i - ’a’ + 26);}for (int i = ’9’; i >= ’0’; i--) { base64Alphabet[i] = (byte) (i - ’0’ + 52);}base64Alphabet[’+’] = 62;base64Alphabet[’/’] = 63;for (int i = 0; i <= 25; i++) { lookUpBase64Alphabet[i] = (char) (’A’ + i);}for (int i = 26, j = 0; i <= 51; i++, j++) { lookUpBase64Alphabet[i] = (char) (’a’ + j);}for (int i = 52, j = 0; i <= 61; i++, j++) { lookUpBase64Alphabet[i] = (char) (’0’ + j);}lookUpBase64Alphabet[62] = (char) ’+’;lookUpBase64Alphabet[63] = (char) ’/’; } private static boolean isWhiteSpace(char octect) {return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9); } private static boolean isPad(char octect) {return (octect == PAD); } private static boolean isData(char octect) {return (octect < BASELENGTH && base64Alphabet[octect] != -1); } /** * Encodes hex octects into Base64 * * @param binaryData * Array containing binaryData * @return Encoded Base64 array */ public static String encode(byte[] binaryData) {if (binaryData == null) { return null;}int lengthDataBits = binaryData.length * EIGHTBIT;if (lengthDataBits == 0) { return '';}int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;int numberQuartet = fewerThan24bits != 0 ? numberTriplets + 1: numberTriplets;char encodedData[] = null;encodedData = new char[numberQuartet * 4];byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;int encodedIndex = 0;int dataIndex = 0;for (int i = 0; i < numberTriplets; i++) { b1 = binaryData[dataIndex++]; b2 = binaryData[dataIndex++]; b3 = binaryData[dataIndex++]; l = (byte) (b2 & 0x0f); k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0); byte val3 = ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)]; encodedData[encodedIndex++] = lookUpBase64Alphabet[(l << 2) | val3]; encodedData[encodedIndex++] = lookUpBase64Alphabet[b3 & 0x3f];}// form integral number of 6-bit groupsif (fewerThan24bits == EIGHTBIT) { b1 = binaryData[dataIndex]; k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4]; encodedData[encodedIndex++] = PAD; encodedData[encodedIndex++] = PAD;} else if (fewerThan24bits == SIXTEENBIT) { b1 = binaryData[dataIndex]; b2 = binaryData[dataIndex + 1]; l = (byte) (b2 & 0x0f); k = (byte) (b1 & 0x03); byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0); byte val2 = ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0); encodedData[encodedIndex++] = lookUpBase64Alphabet[val1]; encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)]; encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2]; encodedData[encodedIndex++] = PAD;}return new String(encodedData); } /** * Decodes Base64 data into octects * * @param encoded * string containing Base64 data * @return Array containind decoded data. */ public static byte[] decode(String encoded) {if (encoded == null) { return null;}char[] base64Data = encoded.toCharArray();// remove white spacesint len = removeWhiteSpace(base64Data);if (len % FOURBYTE != 0) { return null;// should be divisible by four}int numberQuadruple = (len / FOURBYTE);if (numberQuadruple == 0) { return new byte[0];}byte decodedData[] = null;byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;char d1 = 0, d2 = 0, d3 = 0, d4 = 0;int i = 0;int encodedIndex = 0;int dataIndex = 0;decodedData = new byte[(numberQuadruple) * 3];for (; i < numberQuadruple - 1; i++) { if (!isData((d1 = base64Data[dataIndex++])) || !isData((d2 = base64Data[dataIndex++])) || !isData((d3 = base64Data[dataIndex++])) || !isData((d4 = base64Data[dataIndex++]))) {return null; }// if found 'no data' just return null b1 = base64Alphabet[d1]; b2 = base64Alphabet[d2]; b3 = base64Alphabet[d3]; b4 = base64Alphabet[d4]; decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4); decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)); decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);}if (!isData((d1 = base64Data[dataIndex++]))|| !isData((d2 = base64Data[dataIndex++]))) { return null;// if found 'no data' just return null}b1 = base64Alphabet[d1];b2 = base64Alphabet[d2];d3 = base64Data[dataIndex++];d4 = base64Data[dataIndex++];if (!isData((d3)) || !isData((d4))) {// Check if they are PAD characters if (isPad(d3) && isPad(d4)) {if ((b2 & 0xf) != 0)// last 4 bits should be zero{ return null;}byte[] tmp = new byte[i * 3 + 1];System.arraycopy(decodedData, 0, tmp, 0, i * 3);tmp[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);return tmp; } else if (!isPad(d3) && isPad(d4)) {b3 = base64Alphabet[d3];if ((b3 & 0x3) != 0)// last 2 bits should be zero{ return null;}byte[] tmp = new byte[i * 3 + 2];System.arraycopy(decodedData, 0, tmp, 0, i * 3);tmp[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4);tmp[encodedIndex] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));return tmp; } else {return null; }} else { // No PAD e.g 3cQl b3 = base64Alphabet[d3]; b4 = base64Alphabet[d4]; decodedData[encodedIndex++] = (byte) (b1 << 2 | b2 >> 4); decodedData[encodedIndex++] = (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf)); decodedData[encodedIndex++] = (byte) (b3 << 6 | b4);}return decodedData; } /** * remove WhiteSpace from MIME containing encoded Base64 data. * * @param data * the byte array of base64 data (with WS) * @return the new length */ private static int removeWhiteSpace(char[] data) {if (data == null) { return 0;}// count characters that’s not whitespaceint newSize = 0;int len = data.length;for (int i = 0; i < len; i++) { if (!isWhiteSpace(data[i])) {data[newSize++] = data[i]; }}return newSize; }}class PayResult { private String resultStatus; private String result; private String memo; public PayResult(String rawResult) {if (TextUtils.isEmpty(rawResult)) return;String[] resultParams = rawResult.split(';');for (String resultParam : resultParams) { if (resultParam.startsWith('resultStatus')) {resultStatus = gatValue(resultParam, 'resultStatus'); } if (resultParam.startsWith('result')) {result = gatValue(resultParam, 'result'); } if (resultParam.startsWith('memo')) {memo = gatValue(resultParam, 'memo'); }} } @Override public String toString() {return 'resultStatus={' + resultStatus + '};memo={' + memo+ '};result={' + result + '}'; } private String gatValue(String content, String key) {String prefix = key + '={';return content.substring(content.indexOf(prefix) + prefix.length(),content.lastIndexOf('}')); } /** * @return the resultStatus */ public String getResultStatus() {return resultStatus; } /** * @return the memo */ public String getMemo() {return memo; } /** * @return the result */ public String getResult() {return result; }}class SignUtils { private static final String ALGORITHM = 'RSA'; private static final String SIGN_ALGORITHMS = 'SHA1WithRSA'; private static final String DEFAULT_CHARSET = 'UTF-8'; public static String sign(String content, String privateKey) {try { PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec( Base64.decode(privateKey)); KeyFactory keyf = KeyFactory.getInstance(ALGORITHM); PrivateKey priKey = keyf.generatePrivate(priPKCS8); java.security.Signature signature = java.security.Signature .getInstance(SIGN_ALGORITHMS); signature.initSign(priKey); signature.update(content.getBytes(DEFAULT_CHARSET)); byte[] signed = signature.sign(); return Base64.encode(signed);} catch (Exception e) { e.printStackTrace();}return null; }}

前面的幾個常量是需要去支付寶官網(wǎng)獲取的，獲取后直接替換就ok， 其他的代碼基本都是從demo中copy出來的， 現(xiàn)在我們就將支付功能封裝到了一個類中，那么如何使用呢？

Alipay alipay = new Alipay(OrderConfirmActivity.this);alipay.setListener(mAlipayListener);alipay.pay(desc, mOrder.getShopName(), String.valueOf(orderAmount), orderSn, url); /** * 支付寶支付回調(diào) */ private Alipay.OnAlipayListener mAlipayListener = new Alipay.OnAlipayListener() { @Override public void onSuccess() {onOrderSubmitSuccess(); } @Override public void onCancel() {onUserOrderCanceled(); Toast.makeText(OrderConfirmActivity.this, R.string.pay_failed, Toast.LENGTH_SHORT).show(); } @Override public void onWait() { }};

new出對象來，只需要調(diào)用pay方法就ok啦， 不過支付的回調(diào)我們還是必須的，當(dāng)然這個也不麻煩。這里說一下pay方法的幾個參數(shù)，

這幾個參數(shù)在做支付的時候服務(wù)器都會給到，但是要注意一下，這幾個參數(shù)都不能為空或者空字符串，否則會支付失敗。