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<full-backup-content>
    <include domain="database" path="string"/>
    <exclude domain="sharedpref" path="."/>
</full-backup-content>

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<application ...
    android:fullBackupContent="@xml/backup_rules">
</application>

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<manifest ... >
    ...
    <application android:allowBackup="false" ... >
        ...
    </application>
</manifest>

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<?xml version="1.0" encoding="UTF-8" ?>
<ContentPage x:Class="FicusUIChallenge.Views.MainPage"
             xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:behaviors="clr-namespace:FicusUIChallenge.Helpers.Behaviors"
             xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
             ios:Page.UseSafeArea="true"
             xmlns:yummy="clr-namespace:Xamarin.Forms.PancakeView;assembly=Xamarin.Forms.PancakeView"
             >
    <ContentPage.Content>

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using System;
using Xamarin.Forms;

namespace FicusUIChallenge.Helpers.Behaviors
{
    public class BaseBehavior<T> : Behavior<T> where T : BindableObject
    {
        public T AssociatedObject { get; private set; }

        protected override void OnAttachedTo(T bindable)

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using System;
using System.Linq;
using System.Windows.Input;
using Xamarin.Forms;

namespace FicusUIChallenge.Helpers.Behaviors
{
    public class ViewTappedButtonBehavior : BehaviorBase<View>
    {
        public event EventHandler Clicked;

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xmlns:behaviors="clr-namespace:FicusUIChallenge.Helpers.Behaviors"

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 <Image WidthRequest="24"
        HeightRequest="24"
        Source="ic_more.png"
        HorizontalOptions="EndAndExpand"
        VerticalOptions="Center">
    <Image.Behaviors>
        <behaviors:ViewTappedButtonBehavior Command="{Binding OnMoreCommand}" />
    </Image.Behaviors>
</Image>

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<?xml version="1.0" encoding="UTF-8" ?>
<ContentPage x:Class="FicusUIChallenge.Views.TimeLinePage"
             xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:behaviors="clr-namespace:FicusUIChallenge.Helpers.Behaviors"
             xmlns:controls="clr-namespace:FicusUIChallenge.Controls"
             xmlns:yummy="clr-namespace:Xamarin.Forms.PancakeView;assembly=Xamarin.Forms.PancakeView"
             xmlns:converters="clr-namespace:FicusUIChallenge.Converters"
             xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
             ios:Page.UseSafeArea="true">

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using System;
using System.IO;

namespace FormsPrintSample.Services
{
    public interface IPrintService
    {
        bool PrintImage(Stream img);
        bool PrintPdfFile(Stream file);
    }