Android接入支付宝实现支付功能

我本来是想直接讲Android支付这一块的，包括支付宝，微信，其他第三方整合支付等，但是微信开放平台他对我的账号做了限制，所有我今天就先把重心放在支付宝的支付上，也算是写得尽可能详细些吧，毕竟是第三方的SDK，只要我们耐心的阅读文档和开发引导，这个其实不是很难的，我也是没有用过支付宝的支付，但是我相信，你看完这篇博客，也会对他了如指掌的，好的，我们正文开始

一.准备步骤

• 1.登录官网

他的官网就是蚂蚁金服的开放平台了，我们可以访问 蚂蚁金服开放平台 ，并且注册账号进行登录

• 创建应用

如果你是现有的应用直接接入支付功能的话，可以不看这里，我这里是因为需要讲博客所有重新创建了一个项目并且在Android Studio里也重新创建了一个项目，Android Studio里创建的项目我把他叫做SimpleMall，简单商城的意思，那在开放平台我们又是如何去创建应用呢，点击-进入我的开放平台-应用，就可以看到应用管理了。我们点击创建应用

创建成果之后有很多的选项包括需要你上传

这些先不管，我们这个时候可以看到已经拿到了APPID: 2017062807585767，这样我们就可以继续下一步的准备了

• 3.签约

大部分的功能需要签约才能使用，很遗憾，我这个个体户就不行了

• 4.配置密钥

配置秘钥是支付这一环节很重要的因素，也是分了两个步骤，生成秘钥和配置秘钥，这里使用的RAS非对称加密

生成RSA秘钥

我们按照文档上来，首先是下载工具了，这里有win和mac两个地址，我是win，下载下来是这个样子的

我们按照图中的配置拿到了公钥和私钥

那我们可以配置了，我们找到项目详情

然后这里是两种方式，我们选择的是RSA方式么其实哪种方式都是可以的

到这里，这个也配置好了

• 5.SDK 下载

到这里，我们就可以直接去下载他的SDK了SDK下载地址

这个压缩包下载下来什么都有，要找到Android的部分

二.SDK集成

我们现在就开始来把jar集成进去，支付宝给我们提供的就是一个jar，我们放进我们的工程里面去

并且在我们的app/build.gradle里配置一下

compile files('libs/alipaySdk-20170623-proguard.jar')

这样Jar就集成好了，然后配置一下清单文件

        <activity
            android:name="com.alipay.sdk.app.H5PayActivity"android:configChanges="orientation|keyboardHidden|navigation"android:exported="false"android:screenOrientation="behind"/><activity
            android:name="com.alipay.sdk.auth.AuthActivity"android:configChanges="orientation|keyboardHidden|navigation"android:exported="false"android:screenOrientation="behind"/>

并且添加权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

如大于等于Android6.0，还需要动态申请下权限

如果你的项目需要混淆，需要添加混淆规则

-libraryjars libs/alipaySDK-20150602.jar-keep class com.alipay.android.app.IAlixPay{*;}
-keep class com.alipay.android.app.IAlixPay$Stub{*;}
-keep class com.alipay.android.app.IRemoteServiceCallback{*;}
-keep class com.alipay.android.app.IRemoteServiceCallback$Stub{*;}
-keep class com.alipay.sdk.app.PayTask{ public *;}
-keep class com.alipay.sdk.app.AuthTask{ public *;}

嗯，可以说得上是比较简单的，我们继续

三.支付接口调用

其实支付宝的调用还是比较简单的，我们来看一下我的调用方式

public class MainActivity extends AppCompatActivity implements View.OnClickListener {private Button btnPay;private static final int SDK_PAY_FLAG = 1001;private String RSA_PRIVATE = "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";public static final String APPID = "2017062807585767";private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);switch (msg.what) {case SDK_PAY_FLAG:PayResult payResult = new PayResult((Map<String, String>) msg.obj);//同步获取结果String resultInfo = payResult.getResult();Log.i("Pay", "Pay:" + resultInfo);String resultStatus = payResult.getResultStatus();// 判断resultStatus 为9000则代表支付成功if (TextUtils.equals(resultStatus, "9000")) {Toast.makeText(MainActivity.this, "支付成功", Toast.LENGTH_SHORT).show();} else {Toast.makeText(MainActivity.this, "支付失败", Toast.LENGTH_SHORT).show();}break;}}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();}private void initView() {btnPay = (Button) findViewById(R.id.btnPay);btnPay.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btnPay://秘钥验证的类型 true:RSA2 false:RSAboolean rsa = false;//构造支付订单参数列表Map<String, String> params = OrderInfoUtil2_0.buildOrderParamMap(APPID, rsa);//构造支付订单参数信息String orderParam = OrderInfoUtil2_0.buildOrderParam(params);//对支付参数信息进行签名String sign = OrderInfoUtil2_0.getSign(params, RSA_PRIVATE, rsa);//订单信息final String orderInfo = orderParam + "&" + sign;//异步处理Runnable payRunnable = new Runnable() {@Overridepublic void run() {//新建任务PayTask alipay = new PayTask(MainActivity.this);//获取支付结果Map<String, String> result = alipay.payV2(orderInfo, true);Message msg = new Message();msg.what = SDK_PAY_FLAG;msg.obj = result;mHandler.sendMessage(msg);}};// 必须异步调用Thread payThread = new Thread(payRunnable);payThread.start();break;}}
}

可以看到我们并没有多少代码，调用起来

但是还是提示有错误，我们来看一下他的返回值

{"alipay_trade_app_pay_response":{"code":"40006","msg":"Insufficient Permissions","sub_code":"isv.insufficient-isv-permissions","sub_msg":"ISV权限不足"}}

这是因为我们这个应用并没有去签约功能，所有并没有这个权限，好的，但是起码可以看出我们已经可以调用支持包的支付了，那我们继续来了解他的功能吧

四.Api

首先我们看下他提供的OrderInfoUtil2_0这个工具类

public class OrderInfoUtil2_0 {/*** 构造授权参数列表* * @param pid* @param app_id* @param target_id* @return*/public static Map<String, String> buildAuthInfoMap(String pid, String app_id, String target_id, boolean rsa2) {Map<String, String> keyValues = new HashMap<String, String>();// 商户签约拿到的app_id，如：2013081700024223keyValues.put("app_id", app_id);// 商户签约拿到的pid，如：2088102123816631keyValues.put("pid", pid);// 服务接口名称， 固定值keyValues.put("apiname", "com.alipay.account.auth");// 商户类型标识， 固定值keyValues.put("app_name", "mc");// 业务类型， 固定值keyValues.put("biz_type", "openservice");// 产品码， 固定值keyValues.put("product_id", "APP_FAST_LOGIN");// 授权范围， 固定值keyValues.put("scope", "kuaijie");// 商户唯一标识，如：kkkkk091125keyValues.put("target_id", target_id);// 授权类型， 固定值keyValues.put("auth_type", "AUTHACCOUNT");// 签名类型keyValues.put("sign_type", rsa2 ? "RSA2" : "RSA");return keyValues;}/*** 构造支付订单参数列表* @param app_id* @return*/public static Map<String, String> buildOrderParamMap(String app_id, boolean rsa2) {Map<String, String> keyValues = new HashMap<String, String>();keyValues.put("app_id", app_id);keyValues.put("biz_content", "{\"timeout_express\":\"30m\",\"product_code\":\"QUICK_MSECURITY_PAY\",\"total_amount\":\"0.01\",\"subject\":\"1\",\"body\":\"我是测试数据\",\"out_trade_no\":\"" + getOutTradeNo() +  "\"}");keyValues.put("charset", "utf-8");keyValues.put("method", "alipay.trade.app.pay");keyValues.put("sign_type", rsa2 ? "RSA2" : "RSA");keyValues.put("timestamp", "2016-07-29 16:55:53");keyValues.put("version", "1.0");return keyValues;}/*** 构造支付订单参数信息* * @param map* 支付订单参数* @return*/public static String buildOrderParam(Map<String, String> map) {List<String> keys = new ArrayList<String>(map.keySet());StringBuilder sb = new StringBuilder();for (int i = 0; i < keys.size() - 1; i++) {String key = keys.get(i);String value = map.get(key);sb.append(buildKeyValue(key, value, true));sb.append("&");}String tailKey = keys.get(keys.size() - 1);String tailValue = map.get(tailKey);sb.append(buildKeyValue(tailKey, tailValue, true));return sb.toString();}/*** 拼接键值对* * @param key* @param value* @param isEncode* @return*/private static String buildKeyValue(String key, String value, boolean isEncode) {StringBuilder sb = new StringBuilder();sb.append(key);sb.append("=");if (isEncode) {try {sb.append(URLEncoder.encode(value, "UTF-8"));} catch (UnsupportedEncodingException e) {sb.append(value);}} else {sb.append(value);}return sb.toString();}/*** 对支付参数信息进行签名* * @param map*            待签名授权信息* * @return*/public static String getSign(Map<String, String> map, String rsaKey, boolean rsa2) {List<String> keys = new ArrayList<String>(map.keySet());// key排序Collections.sort(keys);StringBuilder authInfo = new StringBuilder();for (int i = 0; i < keys.size() - 1; i++) {String key = keys.get(i);String value = map.get(key);authInfo.append(buildKeyValue(key, value, false));authInfo.append("&");}String tailKey = keys.get(keys.size() - 1);String tailValue = map.get(tailKey);authInfo.append(buildKeyValue(tailKey, tailValue, false));String oriSign = SignUtils.sign(authInfo.toString(), rsaKey, rsa2);String encodedSign = "";try {encodedSign = URLEncoder.encode(oriSign, "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return "sign=" + encodedSign;}/*** 要求外部订单号必须唯一。* @return*/private static String getOutTradeNo() {SimpleDateFormat format = new SimpleDateFormat("MMddHHmmss", Locale.getDefault());Date date = new Date();String key = format.format(date);Random r = new Random();key = key + r.nextInt();key = key.substring(0, 15);return key;}}

而我们一开始就需要构建订单参数列表，就是这个方法

    /*** 构造支付订单参数列表* @param app_id* @return*/public static Map<String, String> buildOrderParamMap(String app_id, boolean rsa2) {Map<String, String> keyValues = new HashMap<String, String>();keyValues.put("app_id", app_id);keyValues.put("biz_content", "{\"timeout_express\":\"30m\",\"product_code\":\"QUICK_MSECURITY_PAY\",\"total_amount\":\"0.01\",\"subject\":\"1\",\"body\":\"我是测试数据\",\"out_trade_no\":\"" + getOutTradeNo() +  "\"}");keyValues.put("charset", "utf-8");keyValues.put("method", "alipay.trade.app.pay");keyValues.put("sign_type", rsa2 ? "RSA2" : "RSA");keyValues.put("timestamp", "2016-07-29 16:55:53");keyValues.put("version", "1.0");return keyValues;}

这个方法我们来解读一下吧，他其实就是构建一个Map的键值对，都有哪些内容呢

• app_id(key)
• biz_content(内容)
• charset（编码）
• method（方法）
• sign_type（签名类型）
• timestamp（时间戳）
• version（版本）

这个demo里面可能都是写死了，但是如果我们真的要在实际应用中开发支付的话，这里要填写正确，我们主要关心的有方法和签名类型还有版本这三个

方法有几个类型，要注意一下

其次就是签名方式了，有两种，RSA和RSA2

最后就是版本，版本可以通过PayTask去获取

    //获取版本private String getPlayVersion(PayTask payTask){return payTask.getVersion();}

而关于biz_content，就需要你们自己去定义了，我们来看下全部的参数说明

当我们拿到map之后就可以转换成一个string作为请求信息了，可以看到我们使用的是这个方法

    /*** 构造支付订单参数信息* * @param map* 支付订单参数* @return*/public static String buildOrderParam(Map<String, String> map) {List<String> keys = new ArrayList<String>(map.keySet());StringBuilder sb = new StringBuilder();for (int i = 0; i < keys.size() - 1; i++) {String key = keys.get(i);String value = map.get(key);sb.append(buildKeyValue(key, value, true));sb.append("&");}String tailKey = keys.get(keys.size() - 1);String tailValue = map.get(tailKey);sb.append(buildKeyValue(tailKey, tailValue, true));return sb.toString();}

他的本质就是拼接出最后的订单信息，如图

好的，现在订单详情已经有了我们就可以把订单加密了

    /*** 对支付参数信息进行签名* * @param map*            待签名授权信息* * @return*/public static String getSign(Map<String, String> map, String rsaKey, boolean rsa2) {List<String> keys = new ArrayList<String>(map.keySet());// key排序Collections.sort(keys);StringBuilder authInfo = new StringBuilder();for (int i = 0; i < keys.size() - 1; i++) {String key = keys.get(i);String value = map.get(key);authInfo.append(buildKeyValue(key, value, false));authInfo.append("&");}String tailKey = keys.get(keys.size() - 1);String tailValue = map.get(tailKey);authInfo.append(buildKeyValue(tailKey, tailValue, false));String oriSign = SignUtils.sign(authInfo.toString(), rsaKey, rsa2);String encodedSign = "";try {encodedSign = URLEncoder.encode(oriSign, "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return "sign=" + encodedSign;}

这里的加密主要还是用到了SignUtils

public class SignUtils {private static final String ALGORITHM = "RSA";private static final String SIGN_ALGORITHMS = "SHA1WithRSA";private static final String SIGN_SHA256RSA_ALGORITHMS = "SHA256WithRSA";private static final String DEFAULT_CHARSET = "UTF-8";private static String getAlgorithms(boolean rsa2) {return rsa2 ? SIGN_SHA256RSA_ALGORITHMS : SIGN_ALGORITHMS;}public static String sign(String content, String privateKey, boolean rsa2) {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(getAlgorithms(rsa2));signature.initSign(priKey);signature.update(content.getBytes(DEFAULT_CHARSET));byte[] signed = signature.sign();return Base64.encode(signed);} catch (Exception e) {e.printStackTrace();}return null;}}

而SignUtils则启动了Base64

public 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 nullb1 = 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 charactersif (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 3cQlb3 = 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;}
}

这些你都可以在我写的demo里获取到的，我们继续分析就是了，当加密成功之后他会返回一个sign的字符串给我，这就是加密信息，然后通过 订单信息 & 加密订单这种公式就拼接出商品信息

//订单信息String orderInfo = orderParam + "&" + sign;

好的，我们的下单需要在异步中操作，也就是我们所见到的Runnable

                Runnable payRunnable = new Runnable() {@Overridepublic void run() {//新建任务PayTask alipay = new PayTask(MainActivity.this);//获取支付结果Map<String, String> result = alipay.payV2(orderInfo, true);Message msg = new Message();msg.what = SDK_PAY_FLAG;msg.obj = result;mHandler.sendMessage(msg);}};

在这里他同样的是构建一个PayTask 区调用payV2，里面的参数就是订单信息和一个boolean值，具体参数可以参考

好的，当我们拿到结果后通过Handler回到UI线程

    PayResult payResult = new PayResult((Map<String, String>) msg.obj);//同步获取结果String resultInfo = payResult.getResult();Log.i("Pay", "Pay:" + resultInfo);String resultStatus = payResult.getResultStatus();// 判断resultStatus 为9000则代表支付成功if (TextUtils.equals(resultStatus, "9000")) {Toast.makeText(MainActivity.this, "支付成功", Toast.LENGTH_SHORT).show();} else {Toast.makeText(MainActivity.this, "支付失败", Toast.LENGTH_SHORT).show();}

这里其实PayResult只是把结果几个关键信息提取出来了

public class PayResult {private String resultStatus;private String result;private String memo;public PayResult(Map<String, String> rawResult) {if (rawResult == null) {return;}for (String key : rawResult.keySet()) {if (TextUtils.equals(key, "resultStatus")) {resultStatus = rawResult.get(key);} else if (TextUtils.equals(key, "result")) {result = rawResult.get(key);} else if (TextUtils.equals(key, "memo")) {memo = rawResult.get(key);}}}@Overridepublic String toString() {return "resultStatus={" + resultStatus + "};memo={" + memo+ "};result={" + result + "}";}/*** @return the resultStatus*/public String getResultStatus() {return resultStatus;}/*** @return the memo*/public String getMemo() {return memo;}/*** @return the result*/public String getResult() {return result;}
}

我们如果想看详细的结果，可以打印resultInfo，好的，关于返回参数，可以参考App支付同步通知参数说明

好的，事实上在实际开发中，要做的准备工作并不只是这么点，毕竟涉及到支付这个敏感话题，我这边也只是个人商户，没办法给大家展示正确的结果了，可能有些疏漏，但是大体就是这样，比微信稍微要简单点，我们下次细聊下微信支付，我们感觉去注册个账号去~~~

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