Example of a material spinner item layout

example_item.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

        <variable
            name="item"
            type="com.example.ExampleItem" />

        <variable
            name="selected"
            type="Boolean" />

    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="@dimen/padding">

        <!--
            Updates the text and enabled state according to the item.
         -->
        <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintEnd_toStartOf="@id/selected_icon"
            app:layout_constraintHorizontal_chainStyle="spread_inside"
            app:layout_constrainedWidth="true"
            app:layout_constraintHorizontal_bias="0"
            tools:text="Spinner Item"
            android:text="@{item.text}"
            android:singleLine="true"
            android:ellipsize="end"
            android:enabled="@{item.enabled}" />

        <!-- Shown if "selected" is true. -->
        <ImageView
            android:id="@+id/selected_icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintStart_toEndOf="@id/text"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            android:src="@drawable/ic_done_black_24dp"
            android:tint="?android:attr/colorAccent"
            android:contentDescription="@string/general_selected_item_accessibility_description"
            app:isNotGone="@{selected}" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</layout>

I am receiving the following error when initialising the adapter:

Cannot find a setter for <android.widget.ImageView app:isNotGone> that accepts parameter type 'java.lang.Boolean'

If a binding adapter provides the setter, check that the adapter is annotated correctly and that the parameter type matches

I used the code as is, I just changed namespaces as my directory is not com.example.