upi_pay 1.0.1 upi_pay: ^1.0.1 copied to clipboard
A flutter plugin to launch UPI payment applications on Android and iOS towards making UPI payments.
import 'dart:io';
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:upi_pay/upi_pay.dart';
void main() => runApp(App());
class App extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('UPI Pay'),
),
body: Screen(),
),
);
}
}
class Screen extends StatefulWidget {
@override
_ScreenState createState() => _ScreenState();
}
class _ScreenState extends State<Screen> {
String? _upiAddrError;
final _upiAddressController = TextEditingController();
final _amountController = TextEditingController();
bool _isUpiEditable = false;
List<ApplicationMeta>? _apps;
@override
void initState() {
super.initState();
_amountController.text =
(Random.secure().nextDouble() * 10).toStringAsFixed(2);
Future.delayed(Duration(milliseconds: 0), () async {
_apps = await UpiPay.getInstalledUpiApplications(
statusType: UpiApplicationDiscoveryAppStatusType.all);
setState(() {});
});
}
@override
void dispose() {
_amountController.dispose();
_upiAddressController.dispose();
super.dispose();
}
void _generateAmount() {
setState(() {
_amountController.text =
(Random.secure().nextDouble() * 10).toStringAsFixed(2);
});
}
Future<void> _onTap(ApplicationMeta app) async {
final err = _validateUpiAddress(_upiAddressController.text);
if (err != null) {
setState(() {
_upiAddrError = err;
});
return;
}
setState(() {
_upiAddrError = null;
});
final transactionRef = Random.secure().nextInt(1 << 32).toString();
print("Starting transaction with id $transactionRef");
final a = await UpiPay.initiateTransaction(
amount: _amountController.text,
app: app.upiApplication,
receiverName: 'Sharad',
receiverUpiAddress: _upiAddressController.text,
transactionRef: transactionRef,
transactionNote: 'UPI Payment',
// merchantCode: '7372',
);
print(a);
}
@override
Widget build(BuildContext context) {
return Container(
padding: EdgeInsets.symmetric(horizontal: 16),
child: ListView(
children: <Widget>[
_vpa(),
if (_upiAddrError != null) _vpaError(),
_amount(),
if (Platform.isIOS) _submitButton(),
Platform.isAndroid ? _androidApps() : _iosApps(),
],
),
);
}
Widget _vpa() {
return Container(
margin: EdgeInsets.only(top: 32),
child: Row(
children: <Widget>[
Expanded(
child: TextFormField(
controller: _upiAddressController,
enabled: _isUpiEditable,
decoration: InputDecoration(
border: OutlineInputBorder(),
hintText: 'address@upi',
labelText: 'Receiving UPI Address',
),
),
),
Container(
margin: EdgeInsets.only(left: 8),
child: IconButton(
icon: Icon(
_isUpiEditable ? Icons.check : Icons.edit,
),
onPressed: () {
setState(() {
_isUpiEditable = !_isUpiEditable;
});
},
),
),
],
),
);
}
Widget _vpaError() {
return Container(
margin: EdgeInsets.only(top: 4, left: 12),
child: Text(
_upiAddrError!,
style: TextStyle(color: Colors.red),
),
);
}
Widget _amount() {
return Container(
margin: EdgeInsets.only(top: 32),
child: Row(
children: <Widget>[
Expanded(
child: TextField(
controller: _amountController,
readOnly: true,
enabled: false,
decoration: InputDecoration(
border: OutlineInputBorder(),
labelText: 'Amount',
),
),
),
Container(
margin: EdgeInsets.only(left: 8),
child: IconButton(
icon: Icon(Icons.loop),
onPressed: _generateAmount,
),
),
],
),
);
}
Widget _submitButton() {
return Container(
margin: EdgeInsets.only(top: 32),
child: Row(
children: <Widget>[
Expanded(
child: MaterialButton(
onPressed: () async => await _onTap(_apps![0]),
child: Text('Initiate Transaction',
style: Theme.of(context)
.textTheme
.button!
.copyWith(color: Colors.white)),
color: Theme.of(context).accentColor,
height: 48,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(6)),
),
),
],
),
);
}
Widget _androidApps() {
return Container(
margin: EdgeInsets.only(top: 32, bottom: 32),
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 12),
child: Text(
'Pay Using',
style: Theme.of(context).textTheme.bodyText1,
),
),
if (_apps != null) _appsGrid(_apps!.map((e) => e).toList()),
],
),
);
}
Widget _iosApps() {
return Container(
margin: EdgeInsets.only(top: 32, bottom: 32),
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
margin: EdgeInsets.only(bottom: 24),
child: Text(
'One of these will be invoked automatically by your phone to '
'make a payment',
style: Theme.of(context).textTheme.bodyText2,
),
),
Container(
margin: EdgeInsets.only(bottom: 12),
child: Text(
'Detected Installed Apps',
style: Theme.of(context).textTheme.bodyText1,
),
),
if (_apps != null) _discoverableAppsGrid(),
Container(
margin: EdgeInsets.only(top: 12, bottom: 12),
child: Text(
'Other Supported Apps (Cannot detect)',
style: Theme.of(context).textTheme.bodyText1,
),
),
if (_apps != null) _nonDiscoverableAppsGrid(),
],
),
);
}
GridView _discoverableAppsGrid() {
List<ApplicationMeta> metaList = [];
_apps!.forEach((e) {
if (e.upiApplication.discoveryCustomScheme != null) {
metaList.add(e);
}
});
return _appsGrid(metaList);
}
GridView _nonDiscoverableAppsGrid() {
List<ApplicationMeta> metaList = [];
_apps!.forEach((e) {
if (e.upiApplication.discoveryCustomScheme == null) {
metaList.add(e);
}
});
return _appsGrid(metaList);
}
GridView _appsGrid(List<ApplicationMeta> apps) {
apps.sort((a, b) => a.upiApplication
.getAppName()
.toLowerCase()
.compareTo(b.upiApplication.getAppName().toLowerCase()));
return GridView.count(
crossAxisCount: 4,
shrinkWrap: true,
mainAxisSpacing: 4,
crossAxisSpacing: 4,
// childAspectRatio: 1.6,
physics: NeverScrollableScrollPhysics(),
children: apps
.map(
(it) => Material(
key: ObjectKey(it.upiApplication),
// color: Colors.grey[200],
child: InkWell(
onTap: Platform.isAndroid ? () async => await _onTap(it) : null,
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
it.iconImage(48),
Container(
margin: EdgeInsets.only(top: 4),
alignment: Alignment.center,
child: Text(
it.upiApplication.getAppName(),
textAlign: TextAlign.center,
),
),
],
),
),
),
)
.toList(),
);
}
}
String? _validateUpiAddress(String value) {
if (value.isEmpty) {
return 'UPI VPA is required.';
}
if (value.split('@').length != 2) {
return 'Invalid UPI VPA';
}
return null;
}