[Flutter] Unhandled Exception: MissingPluginException(No implementation found for method...

Importing Statements


import 'package:expense_tracker/database_helper.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'transaction_screen.dart';
import 'profile_screen.dart';
import 'packageermission_handler/permission_handler.dart';
import 'package:sms_advanced/sms_advanced.dart';

MyApp class


class MyApp extends StatelessWidget {
const MyApp({super.key});

@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Expense Tracker',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
useMaterial3: true,
),
home: const HomeScreen(),
);
}
}

class HomeScreen extends StatefulWidget {
const HomeScreen({super.key});

@override
State<HomeScreen> createState() => _HomeScreenState();
}


HomeScreenState class


class _HomeScreenState extends State<HomeScreen> {
static const platform =
MethodChannel('com.example.expense_tracker/notifications');

String _transactionMessage = 'No transactions yet.';
int _selectedIndex = 0;
List<Map<String, dynamic>> transactions = [];

@override
void initState() {
super.initState();
_startNotificationListener();
requestSmsPermission();
readSmsMessages();
fetchAndDisplayTransactions();
}

void readSmsMessages() async {
debugPrint("readSmsMessages called");
final SmsQuery query = SmsQuery();

// final List<SmsMessage> messages = await query.getAllSms;

List<SmsQueryKind> kinds = [SmsQueryKind.Inbox, SmsQueryKind.Sent];
final List<SmsMessage> messages = await query.querySms(kinds: kinds);

debugPrint("messages length: ${messages.length}");
if (messages.isNotEmpty) {
debugPrint("if");
for (var message in messages) {
if (isUpiTransaction(message.body.toString())) {
// Extract relevant data (amount, transaction ID, etc.)
setState(() {
_transactionMessage = message.body.toString();
storeTransaction(extractTransactionData(_transactionMessage));
debugPrint(_transactionMessage);
});
}
}
}
}

Map<String, dynamic> extractTransactionData(String messageBody) {
// Use regex or pattern matching to extract data from message
RegExp amountPattern = RegExp(r'(\d+(\.\d{1,2})?)');
RegExp transactionIdPattern = RegExp(r'Transaction ID: (\w+)');

String? amount = amountPattern.firstMatch(messageBody)?.group(0);
String? transactionId =
transactionIdPattern.firstMatch(messageBody)?.group(1);

return {
'amount': amount,
'transactionId': transactionId,
'message': messageBody,
};
}

bool isUpiTransaction(String messageBody) {
// Simple keyword check for UPI-related SMS
return messageBody.contains('credited') || messageBody.contains('debited');
}

Future<void> _startNotificationListener() async {
try {
await platform.invokeMethod('startNotificationListener');
} on PlatformException catch (e) {
debugPrint("e.message: ${e.message}");
}

platform.setMethodCallHandler((call) async {
if (call.method == 'notifyTransaction') {
String transactionData = call.arguments;
setState(() {
_transactionMessage = transactionData;
debugPrint(_transactionMessage);
});
}
});
}

Future<void> requestSmsPermission() async {
var status = await Permission.sms.status;
if (!status.isGranted) {
await Permission.sms.request();
}
}

void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}

void storeTransaction(Map<String, dynamic> transactionData) async {
await DatabaseHelper.instance.insertTransaction(transactionData);
}

Future<List<Map<String, dynamic>>> fetchAndDisplayTransactions() async {
List<Map<String, dynamic>> dbtransactions =
await DatabaseHelper.instance.getTransactions();
transactions = dbtransactions;
return dbtransactions;
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Expense Tracker'),
),
body: IndexedStack(
index: _selectedIndex,
children: [
TransactionScreen(
transactions: transactions,
),
const ProfileScreen(),
],
),
bottomNavigationBar: BottomNavigationBar(
items: const <BottomNavigationBarItem>[
BottomNavigationBarItem(
icon: Icon(Icons.list),
label: 'Transactions',
),
BottomNavigationBarItem(
icon: Icon(Icons.person),
label: 'Profile',
),
],
currentIndex: _selectedIndex,
selectedItemColor: Colors.blue,
onTap: _onItemTapped,
),
);
}
}



I want to read all the sms of user's device that's why I am using "sms_advanced" package in Flutter, but when I am using "querySms()" function to get the list of all the messages which are already in his device then I am getting this following error

"Unhandled Exception: MissingPluginException(No implementation found for method getSent o n channel plugins.elyudde.com/querySMS)"

I think it is not able to find the function which I am calling to get the list of all messages, i.e, querySms()

I have also added a debugPrint Statement in "readSmsMessages()" function

When I am running my app using "flutter run" command then it is showing the debug message "readSmsMessages called" in console but after that it is also showing the above error "MissingPluginException"

that's why I am not able to move furthur, so can anyone help me in this please.

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