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The error make encountering indicates that the image_link field does not exist in some of the documents within the user_profile collection. This is causing the app to crash when I trying to access a non-existent field. I need to add error handling to check if the field exists before accessing it.and I need to fetch user profiles from the Firestore collection inside my ContactsPage,

User Profile Code

import 'dart:io';
import 'package:path/path.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:proguard_86/screens/home_screen.dart'; // Ensure this import is correct

class UserProfile extends StatefulWidget {
  static const String screenRoute = "userProfile";
  final String email;
  const UserProfile({Key? key, required this.email}) : super(key: key); 

  @override
  State<UserProfile> createState() => _UserProfileState();
}

class _UserProfileState extends State<UserProfile> {
  File? file;
  String? url;
  final TextEditingController _nameController = TextEditingController();
  var emailcontroller = TextEditingController();
  final FirebaseAuth _auth = FirebaseAuth.instance;

  Future<void> getImage() async {
    final ImagePicker picker = ImagePicker();
    final XFile? image = await picker.pickImage(source: ImageSource.gallery);
    if (image != null) {
      file = File(image.path);
      var imageName = basename(image.path);
      var refStorage = FirebaseStorage.instance.ref(imageName);
      await refStorage.putFile(file!);
      url = await refStorage.getDownloadURL();
      setState(() {});
    }
  }

  Future<void> saveUserProfile(BuildContext context) async {
    String uid = _auth.currentUser!.uid;
    if (url != null && _nameController.text.isNotEmpty) {
      await FirebaseFirestore.instance
          .collection('signup')
          .doc(widget.email)
          .collection('user_profile')
          .doc(uid) // You can use another identifier if needed
          .set({
        'name': _nameController.text,
        'image_link': url,
      });
      // Navigate to the home screen after saving the profile
      Navigator.pushNamed(context, Homescreen.screenroute); // Ensure the correct reference to HomeScreen
    } else {
      // Handle error, either url or name is not provided
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text("Please provide both name and image."),
          backgroundColor: Colors.red,
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    //String email=widget.email!;
    return Scaffold(
      backgroundColor: Colors.red,
      appBar: AppBar(
        backgroundColor: Colors.red,
        title: const Text(
          "Profile Info",
          style: TextStyle(color: Colors.white),
        ),
        centerTitle: true,
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.symmetric(horizontal: 20),
        child: Column(
          children: [
            const Text(
              "Please provide your name and an optional profile photo",
              style: TextStyle(color: Colors.white, fontSize: 12.5),
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 40),
            Container(
              padding: const EdgeInsets.all(26),
              decoration: const BoxDecoration(
                shape: BoxShape.circle,
                color: Colors.white,
              ),
              child: const Icon(Icons.add_a_photo_rounded),
            ),
            const SizedBox(height: 40),
            ElevatedButton(
              onPressed: getImage,
              child: const Text("Upload Image"),
            ),
            if (url != null)
              Image.network(
                url!,
                width: 100,
                height: 100,
                fit: BoxFit.fill,
              ),
            Row(
              children: [
                Expanded(
                  child: TextFormField(
                    controller: _nameController,
                    decoration: const InputDecoration(
                      hintText: "Type your name here",
                    ),
                  ),
                ),
                const Icon(
                  Icons.emoji_emotions_outlined,
                  color: Colors.white,
                )
              ],
            ),
            const SizedBox(height: 20),
            ElevatedButton(
              onPressed: () => saveUserProfile(context),
              child: const Text("Save Profile"),
            ),
          ],
        ),
      ),
    );
  }
}

Contacts Page

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:contacts_service/contacts_service.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:proguard_86/Screens/ContactSearchDelegate.dart';
import 'package:proguard_86/Screens/individual_page.dart';

class ContactsPage extends StatefulWidget {
  static const String screenroute = "ContactsPage";
  const ContactsPage({Key? key}) : super(key: key);

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

class _ContactsPageState extends State<ContactsPage> {
  Set<Contact> _contacts = {};
  bool _contactsLoaded = false;
  TextEditingController _searchController = TextEditingController();
  List<QueryDocumentSnapshot> data = [];
  List<Map<String, dynamic>> userProfileData = [];

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

  Future<void> _getContacts() async {
    // Fetch user profiles from Firestore
    QuerySnapshot userProfilesSnapshot = await FirebaseFirestore.instance.collection('signup').get();
    for (var doc in userProfilesSnapshot.docs) {
      String userId = doc.id;
      QuerySnapshot userProfileSnapshot = await FirebaseFirestore.instance
          .collection('signup')
          .doc(userId)
          .collection('user_profile')
          .get();
      setState(() {
        data.addAll(userProfileSnapshot.docs);
      });
    }
  }

  

  Future<void> uploadContactToFirestore(Contact contact) async {
    FirebaseAuth auth = FirebaseAuth.instance;
    User? user = auth.currentUser;
    if (user != null) {
      FirebaseFirestore firestore = FirebaseFirestore.instance;
      String userId = user.email!;
      CollectionReference userCollection = firestore.collection('users').doc(userId).collection('contacts');

      String phoneNumber = '';
      if (contact.phones != null && contact.phones!.isNotEmpty) {
        phoneNumber = contact.phones!.first.value!;
      }
      // Check if the contact with the same phone number already exists
      QuerySnapshot existingContacts = await userCollection.where('phoneNumber', isEqualTo: phoneNumber).get();
      if (existingContacts.docs.isNotEmpty) {
        print('Contact already exists in Firestore: ${contact.displayName}');
        return; // Do not upload the contact again
      }

      Map<String, dynamic> contactData = {
        'name': contact.displayName ?? '',
        'phoneNumber': phoneNumber,
        'lastSeen': Timestamp.now(),
      };

      await userCollection.add(contactData);

      print('Contact uploaded to Firestore: ${contact.displayName}');
    } else {
      print('User not logged in');
    }
  }

  void navigateToIndividualPage(Contact contact) {
    Navigator.pushNamed(
      context,
      Individualpage.screenroute,
      arguments: {'title': contact.displayName ?? ''},
    );
  }

  Future<void> _askPermissions() async {
    PermissionStatus permissionStatus = await Permission.contacts.status;
    if (permissionStatus != PermissionStatus.granted && permissionStatus != PermissionStatus.permanentlyDenied) {
      permissionStatus = await Permission.contacts.request();
    }

    if (permissionStatus == PermissionStatus.granted) {
      _loadContacts();
    } else {
      _handleInvalidPermissions(permissionStatus);
    }
  }

  Future<void> _loadContacts() async {
    List<Contact> contacts = await ContactsService.getContacts();
    setState(() {
      _contacts = contacts.toSet(); // Convert to Set to remove duplicates
      _contactsLoaded = true;
    });
  }

  void _handleInvalidPermissions(PermissionStatus permissionStatus) {
    if (permissionStatus == PermissionStatus.denied) {
      final snackBar = SnackBar(content: Text('Access to contacts denied'));
      ScaffoldMessenger.of(context).showSnackBar(snackBar);
    } else if (permissionStatus == PermissionStatus.permanentlyDenied) {
      final snackBar = SnackBar(content: Text('Contact data not available on device'));
      ScaffoldMessenger.of(context).showSnackBar(snackBar);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: PreferredSize(
        preferredSize: Size.fromHeight(70.0),
        child: AppBar(
          backgroundColor: Color(0xFF075E54),
          automaticallyImplyLeading: false, // Don't show the leading button
          title: Row(
            mainAxisAlignment: MainAxisAlignment.start,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              IconButton(
                onPressed: () => Navigator.pop(context),
                icon: Icon(Icons.arrow_back, color: Colors.white),
              ),
              Flexible(
                child: Container(
                  child: ListTile(
                    title: Text(
                      'Select contacts',
                      style: TextStyle(color: Colors.white, fontSize: 17, fontWeight: FontWeight.w500),
                    ),
                    subtitle: Text('${_contacts.length} Contacts', style: TextStyle(color: Colors.white54, fontSize: 15)),
                  ),
                ),
              ),
            ],
          ),
          actions: <Widget>[
            Container(
              child: Row(
                children: <Widget>[
                  Container(
                    width: 40,
                    child: IconButton(
                      icon: Icon(Icons.search),
                      onPressed: _contactsLoaded
                          ? () {
                              showSearch(
                                context: context,
                                delegate: ContactSearchDelegate(
                                  _contacts.toList(),
                                  onContactSelected: navigateToIndividualPage,
                                ),
                              );
                            }
                          : null,
                    ),
                  ),
                  Container(
                    width: 40,
                    child: IconButton(
                      icon: Icon(Icons.more_vert),
                      onPressed: () {},
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
      body: ListView(
        padding: EdgeInsets.only(top: 10),
        children: <Widget>[
          // Display user profiles from Firestore
          for (var doc in data)
            ListTile(
              leading: CircleAvatar(
                backgroundImage:  doc.get('imageUrl') != null
                    ? NetworkImage(doc.get('imageUrl'))
                    : AssetImage('images/default-avatar.png') as ImageProvider,
              ),
              title: Text(
                doc.get('name') ?? 'No name',
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.w500),
              ),
              subtitle: Text(doc.get('email') ?? doc.get('phone') ?? 'No Contact Info'),
            ),
          ListTile(
            leading: Container(
              height: 40,
              width: 40,
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(30),
                color: Color(0xFF25D366),
              ),
              child: IconButton(
                icon: Icon(Icons.people),
                onPressed: () {},
                color: Colors.white,
              ),
            ),
            title: Text(
              'New Group',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.w500),
            ),
          ),
          ListTile(
            leading: Container(
              height: 40,
              width: 40,
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(30),
                color: Color(0xFF25D366),
              ),
              child: IconButton(
                icon: Icon(Icons.person_add),
                onPressed: () {},
                color: Colors.white,
              ),
            ),
            title: Text(
              'New Contact',
              style: TextStyle(fontSize: 18, fontWeight: FontWeight.w500),
            ),
          ),
          // Add your contacts dynamically here
          for (var contact in _contacts)
            ListTile(
              leading: Container(
                height: 40,
                width: 40,
                decoration: BoxDecoration(
                  borderRadius: BorderRadius.circular(30),
                  color: Color(0xFF25D366),
                ),
                child: CircleAvatar(
                  // backgroundImage: AssetImage(
                  //   'images/default_avatar.jpg', // Default avatar for contacts
                  // ),
                ),
              ),
              title: Text(
                contact.displayName ?? 'No Name',
                style: TextStyle(fontSize: 18, fontWeight: FontWeight.w500),
              ),
              subtitle: Text(contact.phones?.isNotEmpty == true ? contact.phones!.first.value! : 'No Number'),
              onTap: ()async {
                    await uploadContactToFirestore(contact);
                    Navigator.pushNamed(
                      // ignore: use_build_context_synchronously
                      context,
                      Individualpage.screenroute,
                      arguments: {'title': '${contact.displayName}'},
                    );
                  },
            ),
        ],
      ),
    );
  }
}

The error make encountering indicates that the image_link field does not exist in some of the documents within the user_profile collection. This is causing the app to crash when I trying to access a non-existent field. I need to add error handling to check if the field exists before accessing it.and I need to fetch user profiles from the Firestore collection inside my ContactsPage,

to fetch user profiles documents from the Firestore collection inside my ContactsPage

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Danh mục

State Error (Bad state: field image Url does not exist within the Document Snapshot Platform