public class Singleton {
    // 私有构造函数，防止外部实例化
    private Singleton() {}

    // 静态内部类，只有在调用getInstance()时才会加载
    private static class SingletonHolder {
        private static final Singleton INSTANCE = new Singleton();
    }

    // 提供全局访问点
    public static Singleton getInstance() {
        return SingletonHolder.INSTANCE;
    }
}

import android.app.Activity;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.support.annotation.NonNull;
import android.util.Log;

import com.alipay.sdk.app.PayTask;
// import com.cocos.lib.JsbBridge;

import java.util.Map;

public class AliPay {

    /**
     * 上下文-创建支付对象时候使用
     */
    private final Activity activity;

    /**
     * 支付标志 自定义常量
     */
    private final static int SDK_PAY_FLAG = 1;

    /**
     * 授权标志 自定义常量
     */
    private static final int SDK_AUTH_FLAG = 2;

    /**
     * 创建Handle
     */
    private final Handler mHandler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case SDK_PAY_FLAG: {

                    @SuppressWarnings("unchecked")
                    PayResult payResult = new PayResult((Map<String, String>) msg.obj);

                    processPayResult(payResult);
                    break;
                }
                case SDK_AUTH_FLAG: {
                    break;
                }
                default:
                    Log.w("AliPay", "收到未定义的消息标志");
                    Log.w("AliPay", msg.toString());
            }
        }
    };

    public AliPay(Activity activity) {
        this.activity = activity;
    }

    /**
     * 调用支付功能
     *
     * @param orderInfo 订单信息-由后端提供
     */
    public void Pay(String orderInfo) {

        final Runnable payRunnable = new Runnable() {

            @Override
            public void run() {
                //创建支付宝SDK的支付任务类
                PayTask alipay = new PayTask(activity);
                //调用支付方法并且返回信息
                Map<String, String> result = alipay.payV2(orderInfo, true);
                Log.i("AliPay", result.toString());

                //创建消息
                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();
    }


    /**
     * 处理支付结果
     *
     * @param payResult 支付结果
     */
    private void processPayResult(PayResult payResult) {
        sendToScript("pay",payResult.toString());
    }

    /**
     * 向游戏端发送支付结果消息
     * @param arg0 事件名称
     * @param arg1 事件参数
     */
    private void sendToScript(String arg0, String arg1) {
        Log.d("AliPay",arg0);
        Log.d("AliPay",arg1);
//        JsbBridge.sendToScript(arg0,arg1);
    }
}

import android.text.TextUtils;

import java.util.Map;

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);
            }
        }
    }

    @Override
    public String toString() {
        return "{\"resultStatus\":" + resultStatus + ",\"result\":\"" + result + "\",\"memo\":\"" + memo + "\"}";
    }

    /**
     * @return the resultStatus
     */
    public String getResultStatus() {
        return resultStatus;
    }

    /**
     * @return the memo
     */
    public String getMemo() {
        return memo;
    }

    /**
     * @return the result
     */
    public String getResult() {
        return result;
    }
}