codercampos

//PCL side
using System;

namespace ShareSample
{
	public interface IShareService
	{
		void ShareAction(string textToShare, string imageUrl);
	}
}

codercampos

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<style name="Theme.Splash" parent="android:Theme">
		<item name="android:windowBackground">@drawable/screen</item>
		<item name="android:windowNoTitle">true</item>
		<item name="android:scaleType">fitXY</item>
	</style>
	<style name="MyTheme" parent="MyTheme.Base">
	</style>
	<style name="MyTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">

codercampos

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

namespace YourNameSpace.UI.Controls
{
	public class CustomStackLayout : StackLayout
	{
		public static BindableProperty CommandProperty =
			BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(CustomStackLayout), default(ICommand));

codercampos

/build

codercampos

public class DeviceInfo : IDeviceInfo
{
    public string GetUniqueIdentifier()
    {
        return Android.Provider.Settings.Secure.GetString(Xamarin.Forms.Forms.Context.ContentResolver,
                                                          Android.Provider.Settings.Secure.AndroidId);
    }
}

codercampos

public interface IDeviceInfo
{
    string GetUniqueIdentifier();
}

codercampos

public class iOSDeviceInfo : IDeviceInfo
{
    public string GetUniqueIdentifier()
    {
        return UIDevice.CurrentDevice.IdentifierForVendor.AsString();
    }
}

codercampos

public class AndroidDeviceInfo : IDeviceInfo
{
    public string GetUniqueIdentifier()
    {
        return Android.Provider.Settings.Secure.GetString(Xamarin.Forms.Forms.Context.ContentResolver,
                                                          Android.Provider.Settings.Secure.AndroidId);
    }
}

codercampos

public class UwpDeviceInfo : IDeviceInfo
{
    public string GetUniqueIdentifier()
    {
        var token = HardwareIdentification.GetPackageSpecificToken(null);
        var hardwareId = token.Id;
        var dataReader = Windows.Storage.Streams.DataReader.FromBuffer(hardwareId);

        byte[] bytes = new byte[hardwareId.Length];
        dataReader.ReadBytes(bytes);

codercampos

[assembly: Xamarin.Forms.Dependency(typeof(iOSDeviceInfo))]
namespace Mobile.Platform
{
   ...
}