project_telephony/lib/main.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:telephony/telephony.dart';
import 'mainProvider.dart';

onBackgroundMessage(SmsMessage message) {
  debugPrint("onBackgroundMessage called");
}
// void backgroundFetchHeadlessTask(HeadlessTask task) async {
//   String taskId = task.taskId;
//   bool isTimeout = task.timeout;
//   if (isTimeout) {
//     // This task has exceeded its allowed running-time.
//     // You must stop what you're doing and immediately .finish(taskId)
//     print("[BackgroundFetch] Headless task timed-out: $taskId");
//     BackgroundFetch.finish(taskId);
//     return;
//   }
//   print('[BackgroundFetch] Headless event received.');
//   // Do your work here...
//   BackgroundFetch.finish(taskId);
// }
void main() {
  runApp(const MyApp());
  // BackgroundFetch.registerHeadlessTask(backgroundFetchHeadlessTask);
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

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

class _MyAppState extends State<MyApp> {
  String _message = "";
  final telephony = Telephony.instance;

  @override
  void initState() {
    super.initState();
  }

  onMessage(SmsMessage message) async {
    setState(() {
      _message = message.body ?? "Error reading message body.";
    });
  }

  onSendStatus(SendStatus status) {
    setState(() {
      _message = status == SendStatus.SENT ? "sent" : "delivered";
    });
  }
  Future<void> initPlatformState() async {
    final bool? result = await telephony.requestPhoneAndSmsPermissions;
    if (result != null && result) {
      telephony.listenIncomingSms(
          onNewMessage: onMessage, onBackgroundMessage: onBackgroundMessage);
    }
    if (!mounted) return;
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            MultiProvider(providers: [
              ChangeNotifierProvider(
                create: (context) => MainProvider(),
              )
            ], child: const Home()),
            TextButton(
                onPressed: () async {
                  telephony.sendSms(to: "10086", message: "1");
                },
                child: const Text('sms')),
          ],
        ),
      ),
    );
  }
}

class Home extends StatefulWidget {
  const Home({Key? key}) : super(key: key);

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

class _HomeState extends State<Home> with WidgetsBindingObserver{
  final telephony = Telephony.instance;
  int flag = 0;
  String? phoneNum;

  @override
  void initState() {
    super.initState();
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    MainProvider provider = Provider.of<MainProvider>(context);
    provider.addListener(() { });
  }

  @override
  Widget build(BuildContext context) {
    String? sta, data;
    MainProvider provider = Provider.of<MainProvider>(context);
    sta = provider.st;
    data = provider.data;
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Text(
            '$sta',
            style: const TextStyle(fontSize: 30),
          ),
          Text('$data'),
        ],
      ),
    );
  }
}

// void startService() async {
//   if (Platform.isAndroid) {
//     var methodChannel = const MethodChannel("com.example.project_telephony");
//     await methodChannel.invokeMethod("startService");
//   }
// }