app/lib/paegs/alipay_page/alipay_page.dart

import 'dart:async';
import 'dart:convert';
import 'dart:io';

import 'package:bbyyy/beans/alipay_result_bean_entity.dart';
import 'package:bbyyy/beans/pay_by_alipay_bean_entity.dart';
import 'package:bbyyy/beans/smart_order_bean_entity.dart';
import 'package:bbyyy/https/MyDio.dart';
import 'package:bbyyy/https/my_request.dart';
import 'package:bbyyy/my_tools/const.dart';
import 'package:bbyyy/my_tools/dims.dart';
import 'package:bbyyy/my_tools/easy_loading/easy_loading.dart';
import 'package:bbyyy/my_tools/event_bus.dart';
import 'package:bbyyy/my_tools/my_colors.dart';
import 'package:bbyyy/my_tools/my_cookie.dart';
import 'package:bbyyy/my_tools/my_tools.dart';
import 'package:bbyyy/my_tools/my_views.dart';
import 'package:bbyyy/pay/pay_tools.dart';
import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:tobias/tobias.dart';

class AlipayPage extends StatefulWidget {
  int orderUID;

  AlipayPage(this.orderUID);

  @override
  _AlipayPageState createState() => _AlipayPageState();
}

class _AlipayPageState extends State<AlipayPage> with WidgetsBindingObserver {
  var titles = ['正在支付', '支付成功', '支付失败'];
  var icons = ['images/svg/等待.svg', 'images/svg/成功.svg', 'images/svg/失败.svg'];
  var content = ['正在支付，请稍后…', '支付成功，即将自动跳转…', '支付失败'];
  int status = 0;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    Future.delayed(Duration(seconds: 1), () {
      pay();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      body: Column(
        children: [
          MyViews().myAppBar(titles[status], context, []),
          Expanded(
            child: Center(
              child: Column(
                children: [
                  Container(
                    height: 10,
                    color: MyColors.cF7F7F7,
                  ),
                  Expanded(
                    child: Column(
                      children: [
                        SvgPicture.asset(
                          icons[status],
                          height: 94,
                          width: 94,
                        ),
                        Container(
                          margin: EdgeInsets.only(top: 30),
                          child: Text(
                            content[status],
                            style: TextStyle(
                                color: MyColors.c666666, fontSize: 15),
                          ),
                        ),
                      ],
                      mainAxisAlignment: MainAxisAlignment.center,
                    ),
                  ),
                  Expanded(child: Container()),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }

  pay() {
    payOrder(payWayAliPay, widget.orderUID, (re, hE) {
      if (!hE) {
        PayByAlipayBeanEntity entity =
            PayByAlipayBeanEntity().fromJson(json.decode(re.data.toString()));
        EventBus().on('alipayPaymentCallback', (arg) {
          EventBus().off('alipayPaymentCallback');
          EasyLoading.dismiss();
          showToast('支付成功');
          EventBus().emit('reNoPayOrder');
          // Navigator.pop(context);
        });
        print(entity.data);
        EasyLoading.instance
          ..contentPadding = EdgeInsets.symmetric(horizontal: 20, vertical: 12)
          ..alignment = Alignment.center
          ..loadingStyle = EasyLoadingStyle.light
          ..contentMargin = EdgeInsets.all(20);
        EasyLoading.show();
        aliPay(entity.data).then((value) {
          print(json.encode(value));
          AlipayResultBeanEntity e = AlipayResultBeanEntity()
              .fromJson(json.decode(json.encode(value)));
          try {
            int r = int.parse(e.resultStatus);
            if (r == 9000) {
              showToast('支付成功');
              // Navigator.pop(context);
              setState(() {
                status = 1;
              });
            } else {
              showToast(aliPayResultStatus(r));
              revokePayOrder(widget.orderUID);
              setState(() {
                status = 2;
              });
            }
          } catch (e) {
            EasyLoading.dismiss();
          }
        });
      }
    }, (e) {}, context);
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);
    if (state == AppLifecycleState.paused) {
      print('AlipayPage went to Background');
      count = 0;
      status = 0;
      setState(() {});
    }
    if (state == AppLifecycleState.resumed) {
      print('AlipayPage came back to Foreground');
      if(Platform.isIOS){
        count = 10;
        checkIfTheOrderIsPaid();
      }
    }
  }

  int count = 0;

  void checkIfTheOrderIsPaid() {
    MyDio().query({
      "key": "order",
      "filters": {
        "conditions": ["uid == ${widget.orderUID}"]
      },
      "dims": orderDims,
      "paging": [1, 1]
    }, (response, hasError) {
      if (!hasError) {
        SmartOrderBeanEntity entity = SmartOrderBeanEntity()
            .fromJson(json.decode(response.data.toString()));
        if (entity.data.data[0].state == orderStatePaid) {
          status = 1;
          setState(() {});
          // Timer(Duration(seconds: 1), () {
          //   Navigator.pop(context, '支付成功');
          // });
        } else {
          if (count != 0) {
            Timer(Duration(seconds: 1), () {
              count--;
              checkIfTheOrderIsPaid();
            });
          } else {
            count = 10;
            status = 2;
            setState(() {});
          }
        }
      }
    }, (error) {});
  }
}