I have a project.

This project is need to have a feature that, when we clicked a button
the button will have a timer start, and then will go to another app. I have successfully done that, but the problem is. When the timer come off the another app should be back to my flutter app. I need help with this problem

Thank You.

This is my main_page.dart

import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:wartel_lapas/core/widget/ButtonCustom.dart';
import 'package:wartel_lapas/core/widget/PageCustom.dart';
import 'package:wartel_lapas/pages/token_input_page.dart';

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

  @override
  State<MainPage> createState() => _MainPageState();
}

class _MainPageState extends State<MainPage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageCustom(
        padding: const EdgeInsets.only(
          top: 130,
          right: 18,
          left: 18,
        ),
        children: [
          SizedBox(
            height: 200,
            child: Image.asset(
              'assets/deltakode.png',
              fit: BoxFit.fill,
            ),
          ),
          const SizedBox(
            height: 30,
          ),
          Text(
            'Selamat datang!',
            softWrap: true,
            overflow: TextOverflow.clip,
            textAlign: TextAlign.center,
            style: GoogleFonts.plusJakartaSans(
              fontSize: 24,
              fontWeight: FontWeight.bold,
            ),
          ),
          const SizedBox(
            height: 15,
          ),
          Text(
            'Di Aplikasi Wartel Lapas Silahkan nKlik Tombol di Bawah Ini Untuk nMemulai',
            softWrap: true,
            overflow: TextOverflow.clip,
            textAlign: TextAlign.center,
            style: GoogleFonts.plusJakartaSans(
              fontSize: 16,
              fontWeight: FontWeight.w500,
            ),
          ),
          const SizedBox(
            height: 210,
          ),
          ButtonCustom(
            placeholder: 'Mulai!',
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => const TokenInputPage(),
                ),
              );
            },
          ),
        ],
      ),
    );
  }
}

This is my token_input_dart.dart

import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:wartel_lapas/core/widget/ButtonCustom.dart';
import 'package:wartel_lapas/core/widget/PageCustom.dart';
import 'package:wartel_lapas/pages/phone_input_page.dart';

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

  @override
  State<TokenInputPage> createState() => _TokenInputPageState();
}

class _TokenInputPageState extends State<TokenInputPage> {
  final _token = TextEditingController();
  int timeLeft = 5;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageCustom(
        padding: const EdgeInsets.only(top: 130, right: 16, left: 16),
        children: [
          SizedBox(
            height: 200,
            child: Image.asset(
              'assets/deltakode.png',
              fit: BoxFit.fill,
            ),
          ),
          const SizedBox(
            height: 30,
          ),
          Text(
            'Masukan Voucher Anda!',
            softWrap: true,
            overflow: TextOverflow.clip,
            textAlign: TextAlign.center,
            style: GoogleFonts.plusJakartaSans(
              fontSize: 24,
              fontWeight: FontWeight.bold,
            ),
          ),
          const SizedBox(
            height: 50,
          ),
          TextField(
            controller: _token,
            decoration: InputDecoration(
                labelText: 'Masukan Voucher',
                alignLabelWithHint: true,
                labelStyle: GoogleFonts.plusJakartaSans(fontSize: 16)),
            keyboardType: TextInputType.text,
          ),
          const SizedBox(
            height: 20,
          ),
          ButtonCustom(
            placeholder: 'Masuk',
            onPressed: () {
              Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (context) => PhoneInputPage(
                    timeLeft: timeLeft,
                  ),
                ),
              );
            },
          )
        ],
      ),
    );
  }
}

And this is my phone_input_page.dart

import 'dart:async';
// import 'package:android_intent/android_intent.dart';
import 'package:android_intent_plus/android_intent.dart';
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:wartel_lapas/core/widget/ButtonCustom.dart';
import 'package:wartel_lapas/core/widget/PageCustom.dart';

class PhoneInputPage extends StatefulWidget {
  const PhoneInputPage({super.key, this.timeLeft});

  final timeLeft; // Ensure timeLeft is passed as an integer (in seconds)

  @override
  State<PhoneInputPage> createState() => _PhoneInputPageState();
}

class _PhoneInputPageState extends State<PhoneInputPage> {
  final _phoneController = TextEditingController();
  bool isLoading = false;
  int? balanceAmount;
  String? transactionId;
  Timer? _timer;
  late int _remainingTime; // Countdown timer value

  @override
  void dispose() {
    _phoneController.dispose();
    _timer?.cancel();
    _closeVideoCall();
    super.dispose();
  }

  void _startCountdown() {
    _remainingTime = widget.timeLeft; // Initialize with the provided time
    _timer = Timer.periodic(const Duration(seconds: 1), (timer) {
      setState(() {
        if (_remainingTime > 0) {
          _remainingTime--;
        } else {
          _timer?.cancel();
          _closeVideoCall();
          Navigator.pop(context);
        }
      });
    });
  }

  void _closeVideoCall() async {
    print('Waktu Abis');
    ScaffoldMessenger.of(context).showSnackBar(
      const SnackBar(content: Text('Panggilan telah diakhiri.')),
    );
    // Bring the app back to the foreground
    // const intent = AndroidIntent(
    //   action: 'action_view',
    //   data: 'package:com.example.wartel_lapas',
    //   package: 'com.example.wartel_lapas',
    // );
    // await intent.launch();
    print('Balik');
  }

  String normalizePhoneNumber(String phone) {
    phone = phone.replaceAll(RegExp(r'D'), '');
    if (phone.startsWith('0')) {
      phone = '62${phone.substring(1)}';
    }
    if (!phone.startsWith('62')) {
      return ''; // Invalid format
    }
    return phone;
  }

  void _startVideoCall() async {
    setState(() {
      isLoading = true;
    });

    String normalizedPhone = normalizePhoneNumber(_phoneController.text);

    if (normalizedPhone.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Kode negara tidak ada atau salah.')),
      );
      setState(() {
        isLoading = false;
      });
      return;
    }

    _startCountdown();

    final intent = AndroidIntent(
      action: 'action_view',
      data: 'https://wa.me/$normalizedPhone',
      package: 'com.whatsapp',
    );
    await intent.launch();

    setState(() {
      isLoading = false;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: PageCustom(
        padding: const EdgeInsets.only(
          top: 130,
          right: 18,
          left: 18,
        ),
        children: [
          SizedBox(
            height: 200,
            child: Image.asset(
              'assets/deltakode.png',
              fit: BoxFit.fill,
            ),
          ),
          const SizedBox(
            height: 30,
          ),
          Text(
            'Masukan Nomor Telepon Yang Dituju!',
            softWrap: true,
            overflow: TextOverflow.clip,
            textAlign: TextAlign.center,
            style: GoogleFonts.plusJakartaSans(
              fontSize: 24,
              fontWeight: FontWeight.bold,
            ),
          ),
          const SizedBox(
            height: 30,
          ),
          Text(
            _timer == null
                ? 'Waktu Anda Tersedia: ${widget.timeLeft.toString()} detik'
                : 'Waktu Anda Sisa: $_remainingTime detik',
            style: GoogleFonts.plusJakartaSans(
              fontSize: 16,
              fontWeight: FontWeight.w700,
            ),
          ),
          TextField(
            controller: _phoneController,
            decoration: const InputDecoration(
              labelText: 'Nomor Telepon',
            ),
            keyboardType: TextInputType.phone,
          ),
          const SizedBox(
            height: 20,
          ),
          ButtonCustom(
            onPressed: isLoading ? null : _startVideoCall,
            placeholder:
                isLoading ? const CircularProgressIndicator() : 'Mulai Chat',
          ),
        ],
      ),
    );
  }
}

My package that im using is
cupertino_icons: ^1.0.6
google_fonts: ^6.2.1
android_intent_plus: ^5.2.0

How to get the second app back to my flutter app

Thank you