如何阅读Xamarin形式的联系人 [英] How to Read contacts in Xamarin forms

问题描述

我是Xamarin Platform的初学者，&试图读取xamarin形式的联系人.甚至尝试过使用Xamarin.Mobile，但是它给出了很多错误.找到另外1个插件，即Xamarin.contacts https://github.com/jamesmontemagno/Xamarin .插件/树/主/联系人 但没有给出相关示例.请为所有3个平台使用Xamarin.contacts的相关示例提供帮助 在此先感谢:)

I am a beginner in Xamarin Platform, & trying to read contacts in xamarin forms. Even tried using Xamarin.Mobile, But it gives lots of error. Found 1 more plugin i.e. Xamarin.contacts https://github.com/jamesmontemagno/Xamarin.Plugins/tree/master/Contacts but no relevant example is given. Please help with a relevant example using Xamarin.contacts for all 3 platforms Thanks in advance :)

推荐答案

请记住Xam.Plugin.Contacts当前为Alpha版本.

Just keep in mind Xam.Plugin.Contacts is currently in alpha version.

这是我的实现.请注意，尽管有类名，但它不是真正的MVVM模式.我尽可能简化了代码，以提高可读性.

This is my implementation. Notice despite of class names, it is not a real MVVM pattern. I simplified the code as much as I could to help readability.

MainPage.xaml

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         xmlns:local="clr-namespace:Contacts" 
         x:Class="Contacts.MainPage">

    <ContentPage.BindingContext>
        <local:MainViewModel x:Name="ViewModel" />
    </ContentPage.BindingContext>

    <ListView ItemsSource="{ Binding Contacts }">
        <ListView.ItemTemplate>
            <DataTemplate>
                <TextCell Text="{ Binding DisplayName }" 
                      Detail="{ Binding Nickname }" />
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>    
</ContentPage>

MainViewModel.cs

public class MainViewModel
{
    public ObservableCollection<Plugin.Contacts.Abstractions.Contact> Contacts { get; private set; }

    public MainViewModel()
    {
        this.Contacts = new ObservableCollection<Plugin.Contacts.Abstractions.Contact>();
        ReloadContacts();
    }

    public void ReloadContacts()
    {
        // Device may request user permission to get contacts access.
        var hasPermission = CrossContacts.Current.RequestPermission()
            .GetAwaiter()
            .GetResult();

        if (hasPermission)
        {
            this.Contacts.Clear();

            List<Plugin.Contacts.Abstractions.Contact> contacts = null;
            CrossContacts.Current.PreferContactAggregation = false;

            if (CrossContacts.Current.Contacts == null)
            {
                return;
            }

            contacts = CrossContacts.Current.Contacts.ToList();
            foreach (var contact in contacts)
            {
                this.Contacts.Add(contact);
            }
        }
    }
}

希望这会有所帮助.

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