coffee_page.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_icons/flutter_icons.dart';
import 'package:razorpay_flutter/razorpay_flutter.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:flutter/services.dart';

class CoffeePage extends StatefulWidget {
  @override
  _CoffeePageState createState() => _CoffeePageState();
}

class _CoffeePageState extends State<CoffeePage> {
  int totalAmount = 0;

  Razorpay _razorpay;

  @override
  void initState() {
    super.initState();
    _razorpay = Razorpay();
    _razorpay.on(Razorpay.EVENT_PAYMENT_SUCCESS, _handlePaymentSuccess);
    _razorpay.on(Razorpay.EVENT_PAYMENT_ERROR, _handlePaymentError);
    _razorpay.on(Razorpay.EVENT_EXTERNAL_WALLET, _handleExternalWallet);
  }

  @override
  void dispose() {
    super.dispose();
    _razorpay.clear();
  }

  void openCheckout() async {
    var options = {
      'key': 'rzp_test_NNbwJ9tmM0fbxj',
      'amount': totalAmount * 100,
      'name': 'Shaiq',
      'description': 'Payment',
      'prefill': {'contact': '8888888888', 'email': 'test@razorpay.com'},
      'external': {
        'wallets': ['paytm']
      }
    };

    try {
      _razorpay.open(options);
    } catch (e) {
      debugPrint(e);
    }
  }

  void _handlePaymentSuccess(PaymentSuccessResponse response) {
    Fluttertoast.showToast(
        msg: "SUCCESS: " + response.paymentId, timeInSecForIos: 4);
  }

  void _handlePaymentError(PaymentFailureResponse response) {
    Fluttertoast.showToast(
        msg: "ERROR: " + response.code.toString() + " - " + response.message,
        timeInSecForIos: 4);
  }

  void _handleExternalWallet(ExternalWalletResponse response) {
    Fluttertoast.showToast(
        msg: "EXTERNAL_WALLET: " + response.walletName, timeInSecForIos: 4);
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        body: CustomScrollView(
          slivers: <Widget>[
            SliverAppBar(
              automaticallyImplyLeading: true,
              pinned: true,
              backgroundColor: Color(0xFF6FC5DA),
              expandedHeight: 440,
              title: Text("Cappuccino Coffee",
                  style: TextStyle(
                      fontFamily: 'varela',
                      fontSize: 25.0,
                      fontWeight: FontWeight.bold,
                      color: Colors.white)),
              flexibleSpace: FlexibleSpaceBar(
                //title: Text("Coffee"),
                background: Padding(
                  padding: const EdgeInsets.only(left: 8.0, top: 50),
                  child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
           
                        Row(
                          children: <Widget>[
                            Container(
                              child: Text(
                                  'Freshly steamed milk with \nvanilla-flavored syrup is \nmarked with espresso and \ntopped with caramel drizzle \nfor an oh-so-candy end.',
                                  style: TextStyle(
                                      fontFamily: 'nunito',
                                      fontSize: 16.0,
                                      color: Colors.white)),
                            ),
                            SizedBox(width: 15.0),
                            Container(
                                height: 40.0,
                                width: 40.0,
                                decoration: BoxDecoration(
                                    borderRadius: BorderRadius.circular(20.0),
                                    color: Colors.white),
                                child: Center(
                                    child: Icon(Icons.favorite,
                                        size: 18.0, color: Colors.red)))
                          ],
                        ),