viewholder_header.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools">
    <data>
        <variable name="genre" type="com.nimroddayan.epoxysample.Genre"/>
        <variable name="onHeaderExpanded" type="android.view.View.OnClickListener"/>
    </data>
    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:background="?android:attr/selectableItemBackground"
        android:onClick="@{onHeaderExpanded}">

        <ImageView
            android:id="@+id/icon"
            android:layout_width="24dp"
            android:layout_height="match_parent"
            android:layout_marginEnd="16dp"
            android:layout_marginStart="16dp"
            android:src="@mipmap/ic_launcher"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>

        <TextView
            android:id="@+id/subtitle"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginEnd="16dp"
            android:layout_marginStart="16dp"
            android:gravity="center_vertical"
            android:text="@{genre.name}"
            android:textAppearance="@style/TextAppearance.MaterialComponents.Body1"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@id/icon"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="Genre name"/>
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>