activity_main.xml

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

    <data>
        
        <import type="me.anwarshahriar.twowayprimitive.MainActivity.User" />
        <variable
            name="user"
            type="User" />
        
    </data>

    <LinearLayout
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="16dp">

        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Age"
            android:text="@={`` + user.age}" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="22sp"
            android:text="@{String.valueOf(user.age)}"/>

    </LinearLayout>

</layout>