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

    <data>

        <variable
            name="user"
            type="com.codinginflow.databindingexample.User" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical"
        tools:context=".MainActivity">

        <TextView
            android:id="@+id/text_view_first_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.firstName}"
            android:textAppearance="@style/TextAppearance.AppCompat.Large" />

        <TextView
            android:id="@+id/text_view_last_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{user.lastName}"
            android:textAppearance="@style/TextAppearance.AppCompat.Large" />

        <TextView
            android:id="@+id/text_view_age"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{String.valueOf(user.age)}"
            android:textAppearance="@style/TextAppearance.AppCompat.Large" />

    </LinearLayout>
</layout>
package com.codinginflow.databindingexample

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import com.codinginflow.databindingexample.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding: ActivityMainBinding =
            DataBindingUtil.setContentView(this, R.layout.activity_main)

        binding.user = User("Florian", "Walther", 29)
    }
}
package com.codinginflow.databindingexample

data class User(val firstName: String, val lastName: String, val age: Int)