How to display switch in lollipop of android using xamarin.forms?

Hai,
I am new xamarin.forms.

I was write the code xaml page like

<switch  x:Name="Switch1" HorizontalOptions="Center AndExapand" VerticalOptions="CenterAndExpand"/>

In Android -Switch Render is

[assembly: ExportRenderer(typeof(Xamarin.Forms.Switch), typeof(Switch_Render))]
namespace App4.Droid
{
    public class Switch_Render: SwitchRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Switch> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {

                Control.TextOn = "1";
                Control.TextOff = "0";
                Android.Graphics.Color colorOn = Android.Graphics.Color.Green;
                Android.Graphics.Color colorOff = Android.Graphics.Color.Gray;
                Android.Graphics.Color colorDisabled = Android.Graphics.Color.Gray;

                StateListDrawable drawable = new StateListDrawable();
                drawable.AddState(new int[] { Android.Resource.Attribute.StateChecked }, new ColorDrawable(colorOn));
                drawable.AddState(new int[] { -Android.Resource.Attribute.StateEnabled }, new ColorDrawable(colorDisabled));
                drawable.AddState(new int[] { }, new ColorDrawable(colorOff));

                Control.ThumbDrawable = drawable;
            }
        }
    }
}

In my company I am using visual studio.
I am working under xamarin.forms

By using above code ,the values of 1 and 0 are display on android versions of kitkat,jeallybean.

but i andorid version of lollipop, the values of 1 and 0 are not displayed .

why ?

can any one help me please.
please post your solution.