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MD. 
My Program for MainActivity.kt
package com.example.android.aboutme

import android.content.Context
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.view.inputmethod.InputMethodManager
import android.widget.Button
import android.widget.EditText
import android.widget.TextView

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        findViewById<Button>(R.id.done_button).setOnClickListener {
            addNickname(it)
        }
    }

    private fun addNickname(view: View) {
        val editText = findViewById<EditText>(R.id.nickname_edit)
        val nicknameTextView = findViewById<TextView>(R.id.nickname_text)

        nicknameTextView.text = editText.text
        editText.visibility = View.GONE
        view.visibility = View.GONE
        nicknameTextView.visibility = View.VISIBLE

        // Hide the keyboard.
        val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        imm.hideSoftInputFromWindow(view.windowToken, 0)
    }
}
Udacity Program for MainActivity.kt
package com.example.android.aboutme

import android.content.Context
import androidx.databinding.DataBindingUtil
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import android.view.View
import android.view.inputmethod.InputMethodManager
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import com.example.android.aboutme.databinding.ActivityMainBinding


/**
 * Main Activity of the AboutMe app. This app demonstrates:
 *     * LinearLayout with TextViews, ImageView, Button, EditText, and ScrollView
 *     * ScrollView to display scrollable text
 *     * Getting user input with an EditText.
 *     * Click handler for a Button to retrieve text from an EditText and set it in a TextView.
 *     * Setting the visibility status of a view.
 *     * Data binding between MainActivity and activity_main.xml. How to remove findViewById,
 *       and how to display data in views using the data binding object.
 */
class MainActivity : AppCompatActivity() {

    // TODO (03) Create a binding object in the MainActivity.
    // Binding object for MainActivity.
    // Name of the object is derived from the name of the activity or fragment.
    private lateinit var binding: ActivityMainBinding

    // TODO (09) Create an instance of MyName and set binding.myName to it.
    // Instance of MyName data class.
    private val myName: MyName = MyName("Aleks Haecky")

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // TODO (04) Use DataBindingUtil to set the layout for MainActivity.
        setContentView(R.layout.activity_main)
        // TODO (05) Use the binding object to replace all calls to findViewById.
        findViewById<Button>(R.id.done_button).setOnClickListener {
        // Setting the content view using DataBindingUtil creates an instance of
        // ActivityMainBinding from the supplied activity and the supplied layout. This object
        // contains mappings between the activity and layout,
        // and functionality to interact with them.
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        // Set the value of the myName variable that is declared and used in the layout file.
        binding.myName = myName

        // Click listener for the Done button.
        binding.doneButton.setOnClickListener {
            addNickname(it)
        }
    }
    /**
     * Click handler for the Done button.
     * Demonstrates how data binding can be used to make code much more readable
     * by eliminating calls to findViewById and changing data in the binding object.
     */
    private fun addNickname(view: View) {
        // TODO (10) set the nickname in the binding object and invalidateAll().
        val editText = findViewById<EditText>(R.id.nickname_edit)
        val nicknameTextView = findViewById<TextView>(R.id.nickname_text)

        nicknameTextView.text = editText.text
        editText.visibility = View.GONE
        view.visibility = View.GONE
        nicknameTextView.visibility = View.VISIBLE
        binding.apply {
            // Set the text for nicknameText to the value in nicknameEdit.
            myName?.nickname = nicknameEdit.text.toString()
            // Invalidate all binding expressions and request a new rebind to refresh UI
            invalidateAll()
            // Change which views are visible.
            // Remove the EditText and the Button.
            // With GONE they are invisible and do not occupy space.
            nicknameEdit.visibility = View.GONE
            doneButton.visibility = View.GONE

            // Make the TexView with the nickname visible.
            nicknameText.visibility = View.VISIBLE
        }
        // Hide the keyboard.
        val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        imm.hideSoftInputFromWindow(view.windowToken, 0)
    }
}
}
.xml file
<?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"
    tools:context=".MainActivity">

    <!-- Use a data block to declare variables. -->
    <data>
        <!-- Declare a variable by specifying a name and a data type. -->
        <!-- Use fully qualified name for the type. -->
        <variable
            name="myName"
            type="com.example.android.aboutme.MyName" />
    </data>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:paddingStart="@dimen/padding"
        android:paddingEnd="@dimen/padding">


        <TextView
            android:id="@+id/name_text"
            style="@style/NameStyle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/mohd_ahsan_raza_khan"
            android:textAlignment="center" />

        <EditText
            android:id="@+id/nickname_edit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/layout_margin"
            android:ems="10"
            android:hint="@string/what_is_your_nickname"
            android:textAlignment="center" />

        <Button
            android:id="@+id/done_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/done"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="@dimen/layout_margin"
            android:fontFamily="@font/roboto"
            style="@style/Widget.AppCompat.Button.Colored" />

        <TextView
            android:id="@+id/nickname_text"
            style="@style/NameStyle"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            android:visibility="gone" />

        <ImageView
            android:id="@+id/star_image"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/layout_margin"
            android:contentDescription="@string/yellow_star"
            app:srcCompat="@android:drawable/btn_star_big_on" />

        <ScrollView
            android:id="@+id/bio_scroll"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <TextView
                style="@style/NameStyle"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:lineSpacingMultiplier="1.2"
                android:paddingStart="@dimen/padding"
                android:paddingEnd="@dimen/padding"
                android:text="@string/bio" />
        </ScrollView>
    </LinearLayout>

</layout>
Udacity .xml file
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">

<!-- Use a data block to declare variables. -->
<data>
    <!-- Declare a variable by specifying a name and a data type. -->
    <!-- Use fully qualified name for the type. -->
    <variable
        name="myName"
        type="com.example.android.aboutme.MyName" />
</data>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingStart="@dimen/padding"
    android:paddingEnd="@dimen/padding">

<TextView
android:id="@+id/name_text"
style="@style/NameStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@={myName.name}"
android:textAlignment="center" />

    <!-- Use "@={aboutMe.nickname}" annotation to reference a property -->
    <!-- Reference the declared object (aboutMe) and the property (nickname). -->
<TextView
    android:id="@+id/nickname_text"
    style="@style/NameStyle"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@={myName.nickname}"
    android:textAlignment="center"
    android:visibility="gone" />

    <!-- Use "@={aboutMe.name}" annotation to reference a property -->
    <!-- Reference the declared object (aboutMe) and the property (name). -->
<EditText
android:id="@+id/nickname_edit"
style="@style/NameStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
    android:hint="@string/what_is_your_nickname"
    android:inputType="textPersonName"
    android:text="@={myName.nickname}"
    android:textAlignment="center" />

<Button
android:id="@+id/done_button"
style="@style/Widget.AppCompat.Button.Colored"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="@dimen/layout_margin"
android:fontFamily="@font/roboto"
android:text="@string/done"
android:textAlignment="center" />

<ImageView
android:id="@+id/star_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/layout_margin"
android:contentDescription="@string/yellow_star"
app:srcCompat="@android:drawable/btn_star_big_on" />

<ScrollView
android:id="@+id/bio_scroll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="@dimen/layout_margin">

<TextView
    android:id="@+id/bio_text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:lineSpacingMultiplier="@dimen/line_spacing_multiplier"
    android:text="@string/bio"
    android:textAppearance="@style/NameStyle" />

</ScrollView>
    </LinearLayout>
    </layout>

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