<?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:local="clr-namespace:TestXamarin"
             x:Class="TestXamarin.MainPage">

    <ContentPage.BindingContext>
        <local:MyViewModel />
    </ContentPage.BindingContext>

    <StackLayout>
        <ScrollView>
            <CollectionView ItemsSource="{Binding ResponseResponses}" SelectionMode="Single">
                <CollectionView.ItemTemplate>
                    <DataTemplate>
                        <StackLayout>
                            <StackLayout.GestureRecognizers>
                                <TapGestureRecognizer
                                    Command="{Binding SearchCommand}"
                                    NumberOfTapsRequired="1" />
                            </StackLayout.GestureRecognizers>
                            <Label Grid.Row="0" Text="{Binding Username}" />
                        </StackLayout>
                    </DataTemplate>
                </CollectionView.ItemTemplate>
            </CollectionView>
        </ScrollView>
    </StackLayout>

</ContentPage>



///////////////




using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
using Xamarin.Forms;

namespace TestXamarin
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }
    }

    public class MyViewModel
    {
        public MyViewModel()
        {
            var command = new Command(_ => ResponseResponses.Add(new SearchResponse("e", null)));
            ResponseResponses = new ObservableCollection<SearchResponse>
            {
                new SearchResponse("Test", command),
                new SearchResponse("Test2", command),
                new SearchResponse("Test3", command),
            };
        }

        public ObservableCollection<SearchResponse> ResponseResponses { get; set; }
    }

    public class SearchResponse
    {
        public SearchResponse(string username, ICommand command)
        {
            Username = username;
            SearchCommand = command;
        }

        public string Username { get; }

        public ICommand SearchCommand { get; }
    }
}