Example how to implement a Grouped ListView in Xamarin.Forms Applications - http://julianocustodio.com/GroupedListView

MainPage.xaml

<?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:GroupedListApp"
             x:Class="GroupedListApp.MainPage">

    <StackLayout>
        <ListView x:Name ="listView" IsGroupingEnabled="true" 
                  GroupDisplayBinding="{Binding LongName}" 
                  GroupShortNameBinding="{Binding ShortName}">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <TextCell Text="{Binding Nome}" Detail="{Binding Descricao}" />
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackLayout>

</ContentPage>