将背景图像添加到列表视图xamarin.forms

我为此挣扎了一段时间。我有一个简单的列表视图,它使用数据模型来提取数据。我只想把屏幕大小的图像放在背景上

<ContentPage Padding="0,-20,0,0" xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="xxxxxxxx.Pages.PrayersByCategory">
<ContentPage.Content>
    <ListView RowHeight="55"  x:Name="lv_prayers_categories_page" VerticalOptions="FillAndExpand" HasUnevenRows="false" SelectedItem="Handle_ItemSelected" BackgroundColor="Transparent" SeparatorVisibility="None">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                        <Grid x:Name="cellGrid" Padding="15">
                        <Grid.ColumnDefinition></Grid.ColumnDefinition>
                        <Label x:Name="lblPrayerCategory" Text = "{Binding prayerCategory}" FontSize="16" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2"/>
                        <Label x:Name="lblPrayerCount" Text = "{Binding prayerCategoryID}" FontSize="16" Grid.Row="0" Grid.Column="2" Grid.ColumnSpan="2"/></Grid></ViewCell>        
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</ContentPage.Content>