1. 微信支付

AppID的申请和环境搭建详见Android QQ和微信分享

创建WXPayEntryActivity类，目录必须是"[您的应用包名].wxapi"，并实现IWXAPIEventHandler接口用来回调

注册AppID

IWXAPI mApi = WXAPIFactory.createWXAPI(this, APP_ID, false);
// 将该app注册到微信
mApi.registerApp(APP_ID);

调用支付

partnerId是商户号，prepayId是预支付交易会话ID，package暂填写固定值Sign=WXPay,noncestr是随机字符串，timeStamp是时间戳，sign是签名，详见调起支付API

PayReq request = new PayReq();
request.appId = APP_ID;
request.partnerId = PARENT_ID;
request.prepayId = prepayId;
request.packageValue = PACKAGE;
request.nonceStr = NON_CE_STR;
request.timeStamp = timeStamp;String sign = "appid=" + APP_ID+ "&noncestr=" + NON_CE_STR+ "&package=" + PACKAGE+ "&partnerid=" + PARENT_ID+ "&prepayid=" + prepayId+ "×tamp=" + timeStamp+ "&key=" + KEY;
request.sign = CryptTool.md5Encrypt(sign).toUpperCase();
mApi.sendReq(request); 

需要注意的是签名，详见签名生成算法

支付结果回调

@Override
public void onResp(BaseResp baseResp) {if (baseResp.getType() == ConstantsAPI.COMMAND_PAY_BY_WX) {int errCord = baseResp.errCode; // 0 成功 -1 错误 -2 用户取消}
}

2. 支付宝支付

2.1 申请AppID

直接去蚂蚁金服开放平台申请即可。

2.2 搭建环境

首先到App支付客户端DEMO&SDK下载aar文件，并拷贝到libs目录下

修改Project下build.gradle文件

allprojects {repositories {google()jcenter()// 添加下面的内容flatDir {dirs 'libs'}        }
}

在app下build.gradle文件下添加依赖

dependencies {// 添加下面的内容implementation (name: 'alipaySdk-*', ext: 'aar')// 其他依赖
}

配置AndroidManifest.xml文件

<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" />

混淆配置

-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 *;}
-keep class com.alipay.sdk.app.H5PayCallback {;;
}
-keep class com.alipay.android.phone.mrpc.core.** { *; }
-keep class com.alipay.apmobilesecuritysdk.** { *; }
-keep class com.alipay.mobile.framework.service.annotation.** { *; }
-keep class com.alipay.mobilesecuritysdk.face.** { *; }
-keep class com.alipay.tscenter.biz.rpc.** { *; }
-keep class org.json.alipay.** { *; }
-keep class com.alipay.tscenter.** { *; }
-keep class com.ta.utdid2.** { *;}
-keep class com.ut.device.** { *;}-dontwarn android.net.**
-keep class android.net.SSLCertificateSocketFactory{*;}

2.3 支付和回调

调用支付

final String orderInfo = xxx;
Runnable payRunnable = new Runnable() {@Overridepublic void run() {PayTask alipay = new PayTask(AliPayActivity.this);final Map<String, String> result = alipay.payV2(orderInfo, true);App.post(new Runnable() {@Overridepublic void run() {callBack(result);}});}
};
// 必须异步调用
Thread payThread = new Thread(payRunnable);
payThread.start();

orderInfo从服务器获取数据并拼接而成，详见请求参数说明，参数都应该使用URLEncoder转码过。

String orderInfo = "app_id="+ app_id+ "&biz_content=" + biz_content+ "&charset=" + charset+ "&method=" + method+ "¬ify_url=" + notify_url+ "&sign_type=" + sign_type+ "×tamp=" + timestamp+ "&version=" + version+ "&sign=" + sign;

结果回调

private void callBack(Map<String, String> result) {PayResult payResult = new PayResult(result);/*** 对于支付结果，请商户依赖服务端的异步通知结果。同步通知结果，仅作为支付结束的通知。*/String resultInfo = payResult.getResult();// 同步返回需要验证的信息String resultStatus = payResult.getResultStatus();// 判断resultStatus 为9000则代表支付成功if (TextUtils.equals(resultStatus, "9000")) {// 该笔订单是否真实支付成功，需要依赖服务端的异步通知。setResult(RESULT_OK);} else {// 该笔订单真实的支付结果，需要依赖服务端的异步通知。setResult(RESULT_CANCELED);}finish();
}

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