Xamarin Forms - Android - Add border line at bottom of toolbar

Hey guys ,

I have a toolbar and i want to add a border at the bottom for android .

This is my toolbar.axml

<?xml version="1.0" encoding="utf-8"?>

<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:popupTheme="@style/ThemeOverlay.AppCompat.Light"
    app:layout_scrollFlags="scroll|enterAlways">

  <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="@android:color/holo_blue_dark"/>

</android.support.v7.widget.Toolbar>

This however puts the line in the middle of my toolbar .

I checked several solutions and the view should be beneath the <android.support.v7.widget.Toolbar> , but when i place it below - it says the xml cannot contain multiple root elements .

Any idea how to fix it ?

Thanks