Here's the comprehensive Flutter application for your construction management system: import 'package:flutter/material.dart'; import 'package:construction_app/screens/auth/login_screen.dart'; void main() { runApp(const MyApp()); } class MyApp extends StatelessWidget { const MyApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( title: 'Construction Management', debugShowCheckedModeBanner: false, theme: ThemeData( primarySwatch: Colors.blue, visualDensity: VisualDensity.adaptivePlatformDensity, ), home: const LoginScreen(), ); } } import 'package:flutter/material.dart'; import 'package:construction_app/screens/admin/admin_home.dart'; import 'package:construction_app/screens/engineer/engineer_home.dart'; import 'package:construction_app/screens/client/client_home.dart'; class LoginScreen extends StatefulWidget { const LoginScreen({super.key}); @override State createState() => _LoginScreenState(); } class _LoginScreenState extends State { final _formKey = GlobalKey(); final _emailController = TextEditingController(); final _passwordController = TextEditingController(); String _selectedUserType = 'Admin'; @override Widget build(BuildContext context) { return Scaffold( body: Padding( padding: const EdgeInsets.all(20.0), child: Form( key: _formKey, child: Column( mainAxisAlignment: MainAxisAlignment.center, children: [ const Text( 'Construction Management', style: TextStyle(fontSize: 24, fontWeight: FontWeight.bold), ), const SizedBox(height: 30), DropdownButtonFormField( value: _selectedUserType, items: ['Admin', 'Engineer', 'Client'] .map((type) => DropdownMenuItem( value: type, child: Text(type), )) .toList(), onChanged: (value) { setState(() { _selectedUserType = value!; }); }, decoration: const InputDecoration( labelText: 'User Type', border: OutlineInputBorder(), ), ), const SizedBox(height: 20), TextFormField( controller: _emailController, decoration: const InputDecoration( labelText: 'Email', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter email'; } return null; }, ), const SizedBox(height: 20), TextFormField( controller: _passwordController, obscureText: true, decoration: const InputDecoration( labelText: 'Password', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter password'; } return null; }, ), const SizedBox(height: 30), ElevatedButton( onPressed: () { if (_formKey.currentState!.validate()) { // Navigate based on user type if (_selectedUserType == 'Admin') { Navigator.pushReplacement( context, MaterialPageRoute( builder: (context) => const AdminHomeScreen()), ); } else if (_selectedUserType == 'Engineer') { Navigator.pushReplacement( context, MaterialPageRoute( builder: (context) => const EngineerHomeScreen()), ); } else { Navigator.pushReplacement( context, MaterialPageRoute( builder: (context) => const ClientHomeScreen()), ); } } }, child: const Text('Login'), ), ], ), ), ), ); } } import 'package:flutter/material.dart'; import 'package:construction_app/screens/admin/create_project.dart'; import 'package:construction_app/screens/admin/manage_users.dart'; class AdminHomeScreen extends StatelessWidget { const AdminHomeScreen({super.key}); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Admin Dashboard'), actions: [ IconButton( icon: const Icon(Icons.logout), onPressed: () { Navigator.pushReplacement( context, MaterialPageRoute( builder: (context) => const LoginScreen()), ); }, ), ], ), body: Padding( padding: const EdgeInsets.all(20.0), child: Column( children: [ Card( child: ListTile( title: const Text('Create New Project'), leading: const Icon(Icons.add), onTap: () { Navigator.push( context, MaterialPageRoute( builder: (context) => const CreateProjectScreen()), ); }, ), ), Card( child: ListTile( title: const Text('Manage Users'), leading: const Icon(Icons.people), onTap: () { Navigator.push( context, MaterialPageRoute( builder: (context) => const ManageUsersScreen()), ); }, ), ), Card( child: ListTile( title: const Text('View Projects'), leading: const Icon(Icons.list), onTap: () { // Navigate to projects list }, ), ), Card( child: ListTile( title: const Text('Payment Transactions'), leading: const Icon(Icons.payment), onTap: () { // Navigate to payment transactions }, ), ), ], ), ), ); } } import 'package:flutter/material.dart'; class CreateProjectScreen extends StatefulWidget { const CreateProjectScreen({super.key}); @override State createState() => _CreateProjectScreenState(); } class _CreateProjectScreenState extends State { final _formKey = GlobalKey(); final _projectNameController = TextEditingController(); final _addressController = TextEditingController(); final _valueController = TextEditingController(); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Create New Project'), ), body: Padding( padding: const EdgeInsets.all(20.0), child: Form( key: _formKey, child: Column( children: [ TextFormField( controller: _projectNameController, decoration: const InputDecoration( labelText: 'Project Name', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter project name'; } return null; }, ), const SizedBox(height: 20), TextFormField( controller: _addressController, decoration: const InputDecoration( labelText: 'Project Address', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter project address'; } return null; }, ), const SizedBox(height: 20), TextFormField( controller: _valueController, keyboardType: TextInputType.number, decoration: const InputDecoration( labelText: 'Project Value', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter project value'; } return null; }, ), const SizedBox(height: 30), ElevatedButton( onPressed: () { if (_formKey.currentState!.validate()) { // Save project and navigate back Navigator.pop(context); } }, child: const Text('Create Project'), ), ], ), ), ), ); } } import 'package:flutter/material.dart'; import 'package:construction_app/screens/admin/create_user.dart'; class ManageUsersScreen extends StatelessWidget { const ManageUsersScreen({super.key}); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Manage Users'), ), floatingActionButton: FloatingActionButton( onPressed: () { Navigator.push( context, MaterialPageRoute(builder: (context) => const CreateUserScreen()), ); }, child: const Icon(Icons.add), ), body: ListView.builder( itemCount: 3, // Replace with actual user count itemBuilder: (context, index) { return Card( child: ListTile( leading: const CircleAvatar( backgroundImage: AssetImage('assets/user_placeholder.png'), ), title: Text('User ${index + 1}'), subtitle: Text('user${index + 1}@example.com'), trailing: const Icon(Icons.arrow_forward), onTap: () { // Navigate to user details }, ), ); }, ), ); } } import 'package:flutter/material.dart'; class CreateUserScreen extends StatefulWidget { const CreateUserScreen({super.key}); @override State createState() => _CreateUserScreenState(); } class _CreateUserScreenState extends State { final _formKey = GlobalKey(); final _nameController = TextEditingController(); final _emailController = TextEditingController(); final _mobileController = TextEditingController(); final _passwordController = TextEditingController(); final _confirmPasswordController = TextEditingController(); String _selectedUserType = 'Admin'; @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Create New User'), ), body: SingleChildScrollView( padding: const EdgeInsets.all(20.0), child: Form( key: _formKey, child: Column( children: [ DropdownButtonFormField( value: _selectedUserType, items: ['Admin', 'Engineer', 'Client'] .map((type) => DropdownMenuItem( value: type, child: Text(type), )) .toList(), onChanged: (value) { setState(() { _selectedUserType = value!; }); }, decoration: const InputDecoration( labelText: 'User Type', border: OutlineInputBorder(), ), ), const SizedBox(height: 20), TextFormField( controller: _nameController, decoration: const InputDecoration( labelText: 'Full Name', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter full name'; } return null; }, ), const SizedBox(height: 20), TextFormField( controller: _emailController, keyboardType: TextInputType.emailAddress, decoration: const InputDecoration( labelText: 'Email', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter email'; } return null; }, ), const SizedBox(height: 20), TextFormField( controller: _mobileController, keyboardType: TextInputType.phone, decoration: const InputDecoration( labelText: 'Mobile Number', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter mobile number'; } return null; }, ), const SizedBox(height: 20), TextFormField( controller: _passwordController, obscureText: true, decoration: const InputDecoration( labelText: 'Password', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please enter password'; } if (value.length < 6) { return 'Password must be at least 6 characters'; } return null; }, ), const SizedBox(height: 20), TextFormField( controller: _confirmPasswordController, obscureText: true, decoration: const InputDecoration( labelText: 'Confirm Password', border: OutlineInputBorder(), ), validator: (value) { if (value == null || value.isEmpty) { return 'Please confirm password'; } if (value != _passwordController.text) { return 'Passwords do not match'; } return null; }, ), const SizedBox(height: 30), ElevatedButton( onPressed: () { if (_formKey.currentState!.validate()) { // Create user and navigate back Navigator.pop(context); } }, child: const Text('Create User'), ), ], ), ), ), ); } } import 'package:flutter/material.dart'; class EngineerHomeScreen extends StatelessWidget { const EngineerHomeScreen({super.key}); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Engineer Dashboard'), actions: [ IconButton( icon: const Icon(Icons.logout), onPressed: () { Navigator.pushReplacement( context, MaterialPageRoute( builder: (context) => const LoginScreen()), ); }, ), ], ), body: ListView( padding: const EdgeInsets.all(20.0), children: [ Card( child: ListTile( title: const Text('Assigned Projects'), leading: const Icon(Icons.assignment), onTap: () { // Navigate to assigned projects }, ), ), Card( child: ListTile( title: const Text('Upload Site Photos'), leading: const Icon(Icons.camera_alt), onTap: () { // Navigate to photo upload }, ), ), Card( child: ListTile( title: const Text('Payment History'), leading: const Icon(Icons.payment), onTap: () { // Navigate to payment history }, ), ), ], ), ); } } import 'package:flutter/material.dart'; class ClientHomeScreen extends StatelessWidget { const ClientHomeScreen({super.key}); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: const Text('Client Dashboard'), actions: [ IconButton( icon: const Icon(Icons.logout), onPressed: () { Navigator.pushReplacement( context, MaterialPageRoute( builder: (context) => const LoginScreen()), ); }, ), ], ), body: ListView( padding: const EdgeInsets.all(20.0), children: [ Card( child: ListTile( title: const Text('My Projects'), leading: const Icon(Icons.home), onTap: () { // Navigate to client projects }, ), ), Card( child: ListTile( title: const Text('Payment History'), leading: const Icon(Icons.payment), onTap: () { // Navigate to payment history }, ), ), Card( child: ListTile( title: const Text('Site Updates'), leading: const Icon(Icons.photo_library), onTap: () { // Navigate to site updates }, ), ), ], ), ); } } name: construction_app description: A construction management application. publish_to: 'none' version: 1.0.0+1 environment: sdk: '>=3.0.0 <4.0.0' dependencies: flutter: sdk: flutter cupertino_icons: ^1.0.2 dev_dependencies: flutter_test: sdk: flutter flutter_lints: ^2.0.0 flutter: uses-material-design: true assets: - assets/user_placeholder.png This implementation includes: 1. Login screen with user type selection 2. Admin dashboard with project creation and user management 3. Engineer dashboard for site updates and tasks 4. Client dashboard for project tracking and payments 5. All necessary forms for data entry The UI follows Material Design guidelines and includes all the screens you requested. You can expand each section by implementing the navigation handlers and connecting to a backend service.