TheBaileyBrew

<Shell.FlyoutHeaderTemplate>
    <DataTemplate>
        <yummy:PancakeView
            BackgroundGradientAngle="0"
            BackgroundGradientEndColor="{StaticResource flyoutGradientEndFaded}"
            BackgroundGradientStartColor="{StaticResource flyoutGradientStartFaded}"
            HorizontalOptions="FillAndExpand"
            IsClippedToBounds="true"
            VerticalOptions="FillAndExpand">
            <StackLayout Margin="0,10,0,0" Padding="25">

TheBaileyBrew

<FlyoutItem
    Title="Item Search"
    FlyoutDisplayOptions="AsSingleItem"
    Route="Items_Search">
    <Tab Title="Item Search" Route="item_search">
        <ShellContent
            Title="Item Search"
            ContentTemplate="{DataTemplate local:ItemSearchPage}"
            Route="item_search" />
    </Tab>

TheBaileyBrew

<FlyoutItem
    Title="Items"
    FlyoutDisplayOptions="AsSingleItem"
    Route="Header_Items" />

TheBaileyBrew

protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
{
    // Returning something like this will look at the route declaration and determine if it's a header or item
    return ((FlyoutItem)item).Route.StartsWith("Header") ? NavigationHeaderTemplate : NavigationItemTemplate;
}

TheBaileyBrew

<Shell
    ...
    ItemTemplate="{StaticResource FlyoutTemplateSelector}"
    ... >

TheBaileyBrew

<Style x:Key="FlyoutHeaderStyle" TargetType="Label">
    <Setter Property="FontSize" Value="Default" />
    <Setter Property="Margin" Value="15,0" />
    <Setter Property="TextColor" Value="Black" />
    <Setter Property="FontAttributes" Value="Bold" />
    <Setter Property="HorizontalOptions" Value="Start" />
</Style>

<Style x:Key="FlyoutItemStyle" TargetType="Label">
    <Setter Property="FontSize" Value="Default" />

TheBaileyBrew

public class NavigationFlyoutItemTemplateSelector : DataTemplateSelector
    {
        public DataTemplate NavigationHeaderTemplate { get; set; }
        public DataTemplate NavigationItemTemplate { get; set; }

        protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
        {
            //Returning null, because at this point I'm not sure how to select the correct template
            return null;
        }

TheBaileyBrew

<Shell.ItemTemplate>
        <DataTemplate>
            <ContentView>
                Bindable Properties: Title, Icon
            </ContentView>
        </DataTemplate>
    </Shell.ItemTemplate>

TheBaileyBrew

//I actually have this separated out into a model class, but it could technically be internal like this
internal class NavigationItem {
    public string Title { get; set; }                                   ////This pairs with ShellItem.Title
    public DataTemplate Template { get; set; }                          ////This pairs with ShellItem.ContentTemplate
    public ImageSource Image { get; set; }                              ////This pairs with ShellItem.Icon
    public string Route { get; set; }                                   ////This pairs with ShellItem.Route
    public List<ShellContent> Tabs { get; set; }                        ////This pairs with ShellItem.Tab

    public bool HasImage => Image != null;                              ////These are optional, and just for validation purpose
    public bool HasNavigation => Template != null;                      ////These are optional, and just for validation purpose

TheBaileyBrew

if (mCurrentBookUri == null) {
    Toast.makeText(this,getString(R.string.not_save_msg), Toast.LENGTH_SHORT).show(); 
}
    if (TextUtils.isEmpty(nameString)){
        Toast.makeText(this, getString(R.string.enter_name_req),Toast.LENGTH_SHORT).show();
        return;
    }
    if (TextUtils.isEmpty(priceString)){
        Toast.makeText(this, getString(R.string.enter_price_req),Toast.LENGTH_SHORT).show();
        return;