Xamarin.Forms读取并展示Android和iOS通讯录 - TerminalMACS客户端

本文同步更新地址：

• https://dotnet9.com/11520.html
• https://terminalmacs.com/861.html

阅读导航：

• 一、功能说明
• 二、代码实现
• 三、源码获取
• 四、参考资料
• 五、后面计划

一、功能说明

完整思维导图：https://github.com/dotnet9/TerminalMACS/blob/master/docs/TerminalMACS.xmind

本文介绍图中右侧画红圈处的功能，即使用Xamarin.Forms获取和展示Android和iOS的通讯录信息，下面是最终效果，由于使用的是真实手机，所以联系人姓名及电话号码打码显示。

并简单的进行了搜索功能处理，之所以说简单，是因为通讯录列表是全部读取出来了，搜索是直接从此列表进行过滤的。

下图来自：https://www.xamboy.com/2019/10/10/getting-phone-contacts-in-xamarin-forms/， 本功能是参考此文所写，所以直接引用文中的图片。

二、代码实现

1、共享库工程创建联系人实体类：Contacts.cs

namespace TerminalMACS.Clients.App.Models
{
    /// <summary>
    /// 通讯录
    /// </summary>
    public class Contact
    {
        /// <summary>
        /// 获取或者设置名称
        /// </summary>
        public string Name { get; set; }
        /// <summary>
        /// 获取或者设置 头像
        /// </summary>
        public string Image { get; set; }
        /// <summary>
        /// 获取或者设置 邮箱地址
        /// </summary>
        public string[] Emails { get; set; }
        /// <summary>
        /// 获取或者设置 手机号码
        /// </summary>
        public string[] PhoneNumbers { get; set; }
    }
}

2、共享库创建通讯录服务接口：IContactsService.cs

包括：

• 一个通讯录获取请求接口：RetrieveContactsAsync
• 一个读取一条通讯结果通知事件：OnContactLoaded

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using TerminalMACS.Clients.App.Models;

namespace TerminalMACS.Clients.App.Services
{
    /// <summary>
    /// 通讯录事件参数
    /// </summary>
    public class ContactEventArgs:EventArgs
    {
        public Contact Contact { get; }
        public ContactEventArgs(Contact contact)
        {
            Contact = contact;
        }
    }

    /// <summary>
    /// 通讯录服务接口，android和iOS终端具体的通讯录获取服务需要继承此接口
    /// </summary>
    public interface IContactsService
    {
        /// <summary>
        /// 读取一条数据通知
        /// </summary>
        event EventHandler<ContactEventArgs> OnContactLoaded;
        /// <summary>
        /// 是否正在加载
        /// </summary>
        bool IsLoading { get; }
        /// <summary>
        /// 尝试获取所有通讯录
        /// </summary>
        /// <param name="token"></param>
        /// <returns></returns>
        Task<IList<Contact>> RetrieveContactsAsync(CancellationToken? token = null);
    }
}

3、iOS工程中添加通讯录服务，实现IContactsService接口：

using Contacts;
using Foundation;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using TerminalMACS.Clients.App.Models;
using TerminalMACS.Clients.App.Services;

namespace TerminalMACS.Clients.App.iOS.Services
{
    /// <summary>
    /// 通讯录获取服务
    /// </summary>
    public class ContactsService : NSObject, IContactsService
    {
        const string ThumbnailPrefix = "thumb";

        bool requestStop = false;

        public event EventHandler<ContactEventArgs> OnContactLoaded;

        bool _isLoading = false;
        public bool IsLoading => _isLoading;

        /// <summary>
        /// 异步请求权限
        /// </summary>
        /// <returns></returns>
        public async Task<bool> RequestPermissionAsync()
        {
            var status = CNContactStore.GetAuthorizationStatus(CNEntityType.Contacts);

            Tuple<bool, NSError> authotization = new Tuple<bool, NSError>(status == CNAuthorizationStatus.Authorized, null);

            if (status == CNAuthorizationStatus.NotDetermined)
            {
                using (var store = new CNContactStore())
                {
                    authotization = await store.RequestAccessAsync(CNEntityType.Contacts);
                }
            }
            return authotization.Item1;

        }

        /// <summary>
        /// 异步请求通讯录，此方法由界面真正调用
        /// </summary>
        /// <param name="cancelToken"></param>
        /// <returns></returns>
        public async Task<IList<Contact>> RetrieveContactsAsync(CancellationToken? cancelToken = null)
        {
            requestStop = false;

            if (!cancelToken.HasValue)
                cancelToken = CancellationToken.None;

            // 我们创建了一个十进制的TaskCompletionSource
            var taskCompletionSource = new TaskCompletionSource<IList<Contact>>();

            // 在cancellationToken中注册lambda
            cancelToken.Value.Register(() =>
            {
                // 我们收到一条取消消息，取消TaskCompletionSource.Task
                requestStop = true;
                taskCompletionSource.TrySetCanceled();
            });

            _isLoading = true;

            var task = LoadContactsAsync();

            // 等待两个任务中的第一个任务完成
            var completedTask = await Task.WhenAny(task, taskCompletionSource.Task);
            _isLoading = false;

            return await completedTask;

        }

        /// <summary>
        /// 异步加载通讯录，具体的通讯录读取方法
        /// </summary>
        /// <returns></returns>
        async Task<IList<Contact>> LoadContactsAsync()
        {
            IList<Contact> contacts = new List<Contact>();
            var hasPermission = await RequestPermissionAsync();
            if (hasPermission)
            {

                NSError error = null;
                var keysToFetch = new[] { CNContactKey.PhoneNumbers, CNContactKey.GivenName, CNContactKey.FamilyName, CNContactKey.EmailAddresses, CNContactKey.ImageDataAvailable, CNContactKey.ThumbnailImageData };

                var request = new CNContactFetchRequest(keysToFetch: keysToFetch);
                request.SortOrder = CNContactSortOrder.GivenName;

                using (var store = new CNContactStore())
                {
                    var result = store.EnumerateContacts(request, out error, new CNContactStoreListContactsHandler((CNContact c, ref bool stop) =>
                    {

                        string path = null;
                        if (c.ImageDataAvailable)
                        {
                            path = path = Path.Combine(Path.GetTempPath(), $"{ThumbnailPrefix}-{Guid.NewGuid()}");

                            if (!File.Exists(path))
                            {
                                var imageData = c.ThumbnailImageData;
                                imageData?.Save(path, true);


                            }
                        }

                        var contact = new Contact()
                        {
                            Name = string.IsNullOrEmpty(c.FamilyName) ? c.GivenName : $"{c.GivenName} {c.FamilyName}",
                            Image = path,
                            PhoneNumbers = c.PhoneNumbers?.Select(p => p?.Value?.StringValue).ToArray(),
                            Emails = c.EmailAddresses?.Select(p => p?.Value?.ToString()).ToArray(),

                        };

                        if (!string.IsNullOrWhiteSpace(contact.Name))
                        {
                            OnContactLoaded?.Invoke(this, new ContactEventArgs(contact));

                            contacts.Add(contact);
                        }

                        stop = requestStop;

                    }));
                }
            }

            return contacts;
        }


    }
}

4、在iOS工程中的Info.plist文件添加通讯录权限使用说明

5、在Android工程中添加读取通讯录权限配置：AndroidManifest.xml

<uses-permission android:name="android.permission.READ_CONTACTS"/>

完整权限配置如下

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.terminalmacs.clients.app">
	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="28" />
	<application android:label="TerminalMACS.Clients.App.Android"></application>
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
  <uses-permission android:name="android.permission.READ_CONTACTS"/>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>

6、在Android工程中添加通讯录服务，实现IContactServer接口：ContactsService.cs

using Acr.UserDialogs;
using Android;
using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.Database;
using Android.Provider;
using Android.Runtime;
using Android.Support.V4.App;
using Plugin.CurrentActivity;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using TerminalMACS.Clients.App.Models;
using TerminalMACS.Clients.App.Services;

namespace TerminalMACS.Clients.App.Droid.Services
{
    /// <summary>
    /// 通讯录获取服务
    /// </summary>
    public class ContactsService : IContactsService
    {
        const string ThumbnailPrefix = "thumb";
        bool stopLoad = false;
        static TaskCompletionSource<bool> contactPermissionTcs;
        public string TAG
        {
            get
            {
                return "MainActivity";
            }
        }
        bool _isLoading = false;
        public bool IsLoading => _isLoading;
        //权限请求状态码
        public const int RequestContacts = 1239;
        /// <summary>
        /// 获取通讯录需要的请求权限
        /// </summary>
        static string[] PermissionsContact = {
            Manifest.Permission.ReadContacts
        };

        public event EventHandler<ContactEventArgs> OnContactLoaded;
        /// <summary>
        /// 异步请求通讯录权限
        /// </summary>
        async void RequestContactsPermissions()
        {
            //检查是否可以弹出申请读、写通讯录权限
            if (ActivityCompat.ShouldShowRequestPermissionRationale(CrossCurrentActivity.Current.Activity, Manifest.Permission.ReadContacts)
                || ActivityCompat.ShouldShowRequestPermissionRationale(CrossCurrentActivity.Current.Activity, Manifest.Permission.WriteContacts))
            {
                // 如果未授予许可，请向用户提供其他理由用户将从使用权限的附加上下文中受益。
                // 例如，如果请求先前被拒绝。
                await UserDialogs.Instance.AlertAsync("通讯录权限", "此操作需要“通讯录”权限", "确定");
            }
            else
            {
                // 尚未授予通讯录权限。直接请求这些权限。
                ActivityCompat.RequestPermissions(CrossCurrentActivity.Current.Activity, PermissionsContact, RequestContacts);
            }
        }

        /// <summary>
        /// 收到用户响应请求权限操作后的结果
        /// </summary>
        /// <param name="requestCode"></param>
        /// <param name="permissions"></param>
        /// <param name="grantResults"></param>
        public static void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            if (requestCode == RequestContacts)
            {
                // 我们请求了多个通讯录权限，因此需要检查相关的所有权限
                if (PermissionUtil.VerifyPermissions(grantResults))
                {
                    // 已授予所有必需的权限，显示联系人片段。
                    contactPermissionTcs.TrySetResult(true);
                }
                else
                {
                    contactPermissionTcs.TrySetResult(false);
                }

            }
        }

        /// <summary>
        /// 异步请求权限
        /// </summary>
        /// <returns></returns>
        public async Task<bool> RequestPermissionAsync()
        {
            contactPermissionTcs = new TaskCompletionSource<bool>();

            // 验证是否已授予所有必需的通讯录权限。
            if (Android.Support.V4.Content.ContextCompat.CheckSelfPermission(CrossCurrentActivity.Current.Activity, Manifest.Permission.ReadContacts) != (int)Permission.Granted
                || Android.Support.V4.Content.ContextCompat.CheckSelfPermission(CrossCurrentActivity.Current.Activity, Manifest.Permission.WriteContacts) != (int)Permission.Granted)
            {
                // 尚未授予通讯录权限。
                RequestContactsPermissions();
            }
            else
            {
                // 已授予通讯录权限。
                contactPermissionTcs.TrySetResult(true);
            }

            return await contactPermissionTcs.Task;
        }

        /// <summary>
        /// 异步请求通讯录，此方法由界面真正调用
        /// </summary>
        /// <param name="cancelToken"></param>
        /// <returns></returns>
        public async Task<IList<Contact>> RetrieveContactsAsync(CancellationToken? cancelToken = null)
        {
            stopLoad = false;

            if (!cancelToken.HasValue)
                cancelToken = CancellationToken.None;

            // 我们创建了一个十进制的TaskCompletionSource
            var taskCompletionSource = new TaskCompletionSource<IList<Contact>>();

            // 在cancellationToken中注册lambda
            cancelToken.Value.Register(() =>
            {
                // 我们收到一条取消消息，取消TaskCompletionSource.Task
                stopLoad = true;
                taskCompletionSource.TrySetCanceled();
            });

            _isLoading = true;

            var task = LoadContactsAsync();

            // 等待两个任务中的第一个任务完成
            var completedTask = await Task.WhenAny(task, taskCompletionSource.Task);
            _isLoading = false;

            return await completedTask;
        }

        /// <summary>
        /// 异步加载通讯录，具体的通讯录读取方法
        /// </summary>
        /// <returns></returns>
        async Task<IList<Contact>> LoadContactsAsync()
        {
            IList<Contact> contacts = new List<Contact>();
            var hasPermission = await RequestPermissionAsync();
            if (!hasPermission)
            {
                return contacts;
            }

            var uri = ContactsContract.Contacts.ContentUri;
            var ctx = Application.Context;
            await Task.Run(() =>
            {
                // 暂时只请求通讯录Id、DisplayName、PhotoThumbnailUri，可以扩展
                var cursor = ctx.ApplicationContext.ContentResolver.Query(uri, new string[]
                {
                        ContactsContract.Contacts.InterfaceConsts.Id,
                        ContactsContract.Contacts.InterfaceConsts.DisplayName,
                        ContactsContract.Contacts.InterfaceConsts.PhotoThumbnailUri
                }, null, null, $"{ContactsContract.Contacts.InterfaceConsts.DisplayName} ASC");
                if (cursor.Count > 0)
                {
                    while (cursor.MoveToNext())
                    {
                        var contact = CreateContact(cursor, ctx);

                        if (!string.IsNullOrWhiteSpace(contact.Name))
                        {
                            // 读取出一条，即通知界面展示
                            OnContactLoaded?.Invoke(this, new ContactEventArgs(contact));
                            contacts.Add(contact);
                        }

                        if (stopLoad)
                            break;
                    }
                }
            });

            return contacts;

        }

        /// <summary>
        /// 读取一条通讯录数据
        /// </summary>
        /// <param name="cursor"></param>
        /// <param name="ctx"></param>
        /// <returns></returns>
        Contact CreateContact(ICursor cursor, Context ctx)
        {
            var contactId = GetString(cursor, ContactsContract.Contacts.InterfaceConsts.Id);

            var numbers = GetNumbers(ctx, contactId);
            var emails = GetEmails(ctx, contactId);

            var uri = GetString(cursor, ContactsContract.Contacts.InterfaceConsts.PhotoThumbnailUri);
            string path = null;
            if (!string.IsNullOrEmpty(uri))
            {
                try
                {
                    using (var stream = Android.App.Application.Context.ContentResolver.OpenInputStream(Android.Net.Uri.Parse(uri)))
                    {
                        path = Path.Combine(Path.GetTempPath(), $"{ThumbnailPrefix}-{Guid.NewGuid()}");
                        using (var fstream = new FileStream(path, FileMode.Create))
                        {
                            stream.CopyTo(fstream);
                            fstream.Close();
                        }

                        stream.Close();
                    }


                }
                catch (Exception ex)
                {
                    System.Diagnostics.Debug.WriteLine(ex);
                }

            }
            var contact = new Contact
            {
                Name = GetString(cursor, ContactsContract.Contacts.InterfaceConsts.DisplayName),
                Emails = emails,
                Image = path,
                PhoneNumbers = numbers,
            };

            return contact;
        }

        /// <summary>
        /// 读取联系人电话号码
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="contactId"></param>
        /// <returns></returns>
        string[] GetNumbers(Context ctx, string contactId)
        {
            var key = ContactsContract.CommonDataKinds.Phone.Number;

            var cursor = ctx.ApplicationContext.ContentResolver.Query(
                ContactsContract.CommonDataKinds.Phone.ContentUri,
                null,
                ContactsContract.CommonDataKinds.Phone.InterfaceConsts.ContactId + " = ?",
                new[] { contactId },
                null
            );

            return ReadCursorItems(cursor, key)?.ToArray();
        }

        /// <summary>
        /// 读取联系人邮箱地址
        /// </summary>
        /// <param name="ctx"></param>
        /// <param name="contactId"></param>
        /// <returns></returns>
        string[] GetEmails(Context ctx, string contactId)
        {
            var key = ContactsContract.CommonDataKinds.Email.InterfaceConsts.Data;

            var cursor = ctx.ApplicationContext.ContentResolver.Query(
                ContactsContract.CommonDataKinds.Email.ContentUri,
                null,
                ContactsContract.CommonDataKinds.Email.InterfaceConsts.ContactId + " = ?",
                new[] { contactId },
                null);

            return ReadCursorItems(cursor, key)?.ToArray();
        }

        IEnumerable<string> ReadCursorItems(ICursor cursor, string key)
        {
            while (cursor.MoveToNext())
            {
                var value = GetString(cursor, key);
                yield return value;
            }

            cursor.Close();
        }

        string GetString(ICursor cursor, string key)
        {
            return cursor.GetString(cursor.GetColumnIndex(key));
        }

    }
}

需要添加 Plugin.CurrentActivity 和 Acr.UserDialogs 包。

7、Android工程添加权限处理判断类

Permission.Util

using Android.Content.PM;

namespace TerminalMACS.Clients.App.Droid
{
    public static class PermissionUtil
    {
        /**
		* 通过验证给定数组中的每个条目的值是否为Permission.Granted，检查是否已授予所有给定权限。
		*
		* See Activity#onRequestPermissionsResult (int, String[], int[])
		*/
        public static bool VerifyPermissions(Permission[] grantResults)
        {
            // 必须至少检查一个结果.
            if (grantResults.Length < 1)
                return false;

            // 验证是否已授予每个必需的权限，否则返回false.
            foreach (Permission result in grantResults)
            {
                if (result != Permission.Granted)
                {
                    return false;
                }
            }
            return true;
        }
    }
}

MainActivity.OnRequestPermissionResult是权限申请结果处理函数，在此函数中调用ContactsService.OnRequestPermissionsResult通知通讯录服务权限处理结果。

MainActivity.cs

using Acr.UserDialogs;
using Android.App;
using Android.Content.PM;
using Android.OS;
using Android.Runtime;
using TerminalMACS.Clients.App.Droid.Services;
using TerminalMACS.Clients.App.Services;

namespace TerminalMACS.Clients.App.Droid
{
    [Activity(Label = "TerminalMACS.Clients.App", Icon = "@mipmap/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        IContactsService contactsService = new ContactsService();
        protected override void OnCreate(Bundle savedInstanceState)
        {
            TabLayoutResource = Resource.Layout.Tabbar;
            ToolbarResource = Resource.Layout.Toolbar;

            base.OnCreate(savedInstanceState);

            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
            UserDialogs.Init(() => this);

            // 将通讯录服务实例传递给共享库，由共享库使用读取通讯录接口
            LoadApplication(new App(contactsService));
        }
        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
        {
            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);

            // 通讯录服务处理权限请求结果
            ContactsService.OnRequestPermissionsResult(requestCode, permissions, grantResults);
            
            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}

8、创建通讯录ViewModel，并使用通讯录服务

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Input;
using TerminalMACS.Clients.App.Models;
using TerminalMACS.Clients.App.Services;
using Xamarin.Forms;

namespace TerminalMACS.Clients.App.ViewModels
{
    /// <summary>
    /// 通讯录ViewModel
    /// </summary>
    public class ContactViewModel : BaseViewModel
    {
        /// <summary>
        /// 通讯录服务接口
        /// </summary>
        IContactsService _contactService;
        /// <summary>
        /// 标题
        /// </summary>
        public new string Title => "通讯录";
        private string _SearchText;
        /// <summary>
        /// 搜索关键字
        /// </summary>
        public string SearchText
        {
            get { return _SearchText; }
            set
            {
                SetProperty(ref _SearchText, value);
            }
        }
        /// <summary>
        /// 通讯录搜索命令
        /// </summary>
        public ICommand RaiseSearchCommand { get; }
        /// <summary>
        /// 通讯录列表
        /// </summary>
        public ObservableCollection<Contact> Contacts { get; set; }
        private List<Contact> _FilteredContacts;
        /// <summary>
        /// 通讯录过滤列表
        /// </summary>
        public List<Contact> FilteredContacts

        {
            get { return _FilteredContacts; }
            set
            {
                SetProperty(ref _FilteredContacts, value);
            }
        }
        public ContactViewModel(IContactsService contactService)
        {
            _contactService = contactService;
            Contacts = new ObservableCollection<Contact>();
            Xamarin.Forms.BindingBase.EnableCollectionSynchronization(Contacts, null, ObservableCollectionCallback);
            _contactService.OnContactLoaded += OnContactLoaded;
            LoadContacts();
            RaiseSearchCommand = new Command(RaiseSearchHandle);
        }

        /// <summary>
        /// 过滤通讯录
        /// </summary>
        void RaiseSearchHandle()
        {
            if (string.IsNullOrEmpty(SearchText))
            {
                FilteredContacts = Contacts.ToList();
                return;
            }

            Func<Contact, bool> checkContact = (s) =>
            {
                if (!string.IsNullOrWhiteSpace(s.Name) && s.Name.ToLower().Contains(SearchText.ToLower()))
                {
                    return true;
                }
                else if (s.PhoneNumbers.Length > 0 && s.PhoneNumbers.ToList().Exists(cu => cu.ToString().Contains(SearchText)))
                {
                    return true;
                }
                return false;
            };
            FilteredContacts = Contacts.ToList().Where(checkContact).ToList();
        }

        /// <summary>
        /// BindingBase.EnableCollectionSynchronization 为集合启用跨线程更新
        /// </summary>
        /// <param name="collection"></param>
        /// <param name="context"></param>
        /// <param name="accessMethod"></param>
        /// <param name="writeAccess"></param>
        void ObservableCollectionCallback(IEnumerable collection, object context, Action accessMethod, bool writeAccess)
        {
            // `lock` ensures that only one thread access the collection at a time
            lock (collection)
            {
                accessMethod?.Invoke();
            }
        }

        /// <summary>
        /// 收到事件通知，读取一条通讯录信息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnContactLoaded(object sender, ContactEventArgs e)
        {
            Contacts.Add(e.Contact);
            RaiseSearchHandle();
        }

        /// <summary>
        /// 异步读取终端通讯录
        /// </summary>
        /// <returns></returns>
        async Task LoadContacts()
        {
            try
            {
                await _contactService.RetrieveContactsAsync();
            }
            catch (TaskCanceledException)
            {
                Console.WriteLine("任务已经取消");
            }
        }
    }
}

9、添加通讯录页面展示通讯录数据

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://xamarin.com/schemas/2014/forms/design"
             xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
             mc:Ignorable="d"
             Title="{Binding Title}"
             x:Class="TerminalMACS.Clients.App.Views.ContactPage"
             ios:Page.UseSafeArea="true">
    <ContentPage.Content>
        <StackLayout>
            <SearchBar x:Name="filterText"
                        HeightRequest="40"
                        Text="{Binding SearchText}"
                       SearchCommand="{Binding RaiseSearchCommand}"/>
            <ListView   ItemsSource="{Binding FilteredContacts}"
                        HasUnevenRows="True">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <StackLayout Padding="10"
                                         Orientation="Horizontal">
                                <Image  Source="{Binding Image}"
                                        VerticalOptions="Center"
                                        x:Name="image"
                                        Aspect="AspectFit"
                                        HeightRequest="60"/>
                                <StackLayout VerticalOptions="Center">
                                    <Label Text="{Binding Name}"
                                       FontAttributes="Bold"/>
                                    <Label Text="{Binding PhoneNumbers[0]}"/>
                                    <Label Text="{Binding Emails[0]}"/>
                                </StackLayout>
                            </StackLayout>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>
    </ContentPage.Content>
</ContentPage>

三、源码获取

• 1.完整源码：https://github.com/dotnet9/TerminalMACS

• 2.Android客户端可成功取得通讯录数据，并可查询；

已编译的Android客户端：https://terminalmacs.com/terminalmacs-clients-app-android

• 3.iOS读取通讯录功能代码也已添加，但由于本人没有iOS测试环境，所以未验证，有条件的朋友可以测试下iOS的通讯录读取功能，如果代码不起作用，可参考本文参考的文章检查iOS代码。

四、参考资料

Getting phone contacts in Xamarin Forms：https://www.xamboy.com/2019/10/10/getting-phone-contacts-in-xamarin-forms/

参考文章末尾有源代码链接。

五、后面计划

Xamarin.Forms客户端基本信息获取，比如IMEI、IMSI、本机号码、Mac地址等。