How can i use Xamarin.Forms ContentView in xamarin Android Main.xml - xamarin

Question

I create a ContentView in xamarin forms and i want to use it in Main.xml in the xamarin android
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class SwapPage : ContentView
{
public SwapPage()
{
InitializeComponent();
}
double? layoutHeight;
double layoutBoundsHeight;
int direction;
const double layoutPropHeightMax = 0.75;
const double layoutPropHeightMin = 0.04;
private void PanGestureHandler(object sender, PanUpdatedEventArgs e)
{
layoutHeight = layoutHeight ?? ((sender as StackLayout).Parent as AbsoluteLayout).Height;
switch (e.StatusType)
{
case GestureStatus.Started:
layoutBoundsHeight = AbsoluteLayout.GetLayoutBounds(sender as StackLayout).Height;
break;
case GestureStatus.Running:
direction = e.TotalY < 0 ? 1 : -1;
var yProp = layoutBoundsHeight + (-e.TotalY / (double)layoutHeight);
if ((yProp > layoutPropHeightMin) & (yProp < layoutPropHeightMax))
AbsoluteLayout.SetLayoutBounds(bottomDrawer, new Rectangle(0.5, 1.00, 0.9, yProp));
break;
case GestureStatus.Completed:
if (direction > 0) // snap to max/min, you could use an animation....
{
AbsoluteLayout.SetLayoutBounds(bottomDrawer, new Rectangle(0.5, 1.00, 0.9, layoutPropHeightMax));
swipeLabel.Text = "Swipe me down";
}
else
{
AbsoluteLayout.SetLayoutBounds(bottomDrawer, new Rectangle(0.5, 1.00, 0.9, layoutPropHeightMin));
swipeLabel.Text = "Swipe me up";
}
break;
}
}
}
This is my ContentView and
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="100"
xmlns:local="clr-namespace:......Pages">
<fragment
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="0dp"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_weight="90"/>
<local:SwapPage
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
and the error is
Android.Views.InflateException: 'Binary XML file line #1: Binary XML file line #1: Error inflating class SwapPage'