Fetch Contact In Xamarin.Forms

For fetching contacts we need to code platform specifically so I plan to write a code to fetch all contact lists and create a demo on it. All developers can easily access it in Xamarin Forms Project .

 

Code For Android Side

using System;
    using System.Collections.Generic;
    using System.Runtime.CompilerServices;
    using System.Threading.Tasks;
    using Xamarin.Forms;
    using System.Linq;
    using FetchContactsDemo.Droid;

    [assembly: Xamarin.Forms.Dependency(typeof(UserContactService))]
    namespace FetchContactsDemo.Droid
    {
        public class UserContactService : IUserContactService
        {
            private readonly Xamarin.Contacts.AddressBook _book;
            private static IEnumerable<MobileUserContact> _contacts;

            public UserContactService()
            {
                _book = new Xamarin.Contacts.AddressBook(Forms.Context.ApplicationContext);
            }

            public List<MobileUserContact> FindContacts(string searchInContactsString)
            {

                var ResultContacts = new List<MobileUserContact>();

                foreach (var currentContact in _contacts)
                {
                    // Running a basic String Contains() search through all the
                    // fields in each Contact in the list for the given search string
                    if ((currentContact.Contact_FirstName != null && currentContact.Contact_FirstName.ToLower().Contains(searchInContactsString.ToLower())) ||
                        (currentContact.Contact_LastName != null && currentContact.Contact_LastName.ToLower().Contains(searchInContactsString.ToLower())) ||
                        (currentContact.Contact_EmailId != null && currentContact.Contact_EmailId.ToLower().Contains(searchInContactsString.ToLower())))
                    {
                        ResultContacts.Add(currentContact);
                    }
                }

                return ResultContacts;
            }

            public async Task<IEnumerable<MobileUserContact>> GetAllContacts()
            {

                if (_contacts != null) return _contacts;


                var contacts = new List<MobileUserContact>();
                await _book.RequestPermission().ContinueWith(t =>
                            {
                                if (!t.Result)
                                {
                                    Console.WriteLine("Sorry ! Permission was denied by user or manifest !");
                                    return;
                                }
                                foreach (var contact in _book.ToList())
                                {
                                    var firstOrDefault = contact.Emails.FirstOrDefault();
                                    var number = contact.Phones.FirstOrDefault();

                                    contacts.Add (new MobileUserContact () {
                                        Contact_FirstName = contact.FirstName + "====>" + number.Number,
                                        Contact_LastName = contact.LastName,
                                        Contact_DisplayName = contact.DisplayName,
                                        Contact_EmailId = firstOrDefault != null ? firstOrDefault.Address : String.Empty,
                                        Contact_Number = number != null ? number.Number : String.Empty
                                    });
                                }
                            });

                _contacts = (from c in contacts orderby c.Contact_FirstName select c).ToList();

                return _contacts;
            }
        }
    }

Code For iOS Side

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    using FetchContactsDemo.iOS;

    [assembly: Xamarin.Forms.Dependency(typeof(UserContactService))]
    namespace FetchContactsDemo.iOS
    {
        public class UserContactService : IUserContactService
        {
            private readonly Xamarin.Contacts.AddressBook _book;
            private static IEnumerable<MobileUserContact> _contacts;
            public UserContactService()
            {
                _book = new Xamarin.Contacts.AddressBook();
            }

            public List<MobileUserContact> FindContacts(string searchInContactsString)
            {
                var ResultContacts = new List<MobileUserContact>();

                foreach (var currentContact in _contacts)
                {
                    // Running a basic String Contains() search through all the
                    // fields in each Contact in the list for the given search string
                    if ((currentContact.Contact_FirstName != null && currentContact.Contact_FirstName.ToLower().Contains(searchInContactsString.ToLower())) ||
                        (currentContact.Contact_LastName != null && currentContact.Contact_LastName.ToLower().Contains(searchInContactsString.ToLower())) ||
                        (currentContact.Contact_EmailId != null && currentContact.Contact_EmailId.ToLower().Contains(searchInContactsString.ToLower())))
                    {
                        ResultContacts.Add(currentContact);
                    }
                }

                return ResultContacts;
            }

            public async Task<IEnumerable<MobileUserContact>> GetAllContacts()
            {
                if (_contacts != null) return _contacts;


                var contacts = new List<MobileUserContact>();
                await _book.RequestPermission().ContinueWith(t =>
                            {
                                if (!t.Result)
                                {
                                    Console.WriteLine("Sorry ! Permission was denied by user or manifest !");
                                    return;
                                }
                                foreach (var contact in _book.ToList())
                                {
                                    var firstOrDefault = contact.Emails.FirstOrDefault();

                                    contacts.Add(new MobileUserContact()
                                    {
                                        Contact_FirstName = contact.FirstName +"===>"+ contact.LastName +"===>"+ contact.DisplayName,
                                        Contact_LastName = contact.LastName,
                                        Contact_DisplayName = contact.DisplayName,
                                        Contact_EmailId = firstOrDefault != null ? firstOrDefault.Address : String.Empty
                                    });
                                }
                            });

                _contacts = (from c in contacts orderby c.Contact_FirstName select c).ToList();

                return _contacts;
            }
        }
    }

From Forms we call method to fetch contact to create interface,

using System;
    using System.Collections.Generic;
    using System.Threading.Tasks;

    namespace FetchContactsDemo
    {
        public interface IUserContactService
        {
            Task<IEnumerable<MobileUserContact>> GetAllContacts();
            List<MobileUserContact> FindContacts(string searchInContactsString);
        }
    }

Calling Method with DependencyService,

try
                {
                    _contactService = DependencyService.Get<IUserContactService>();
                    var contacts = await _contactService.GetAllContacts();
                    ContactList = new ObservableCollection<MobileUserContact>(contacts);
                }
                catch (System.Exception ex)
                {

                }

Output

 

 

Source Code