android kotlin - Get screen size category

MainActivity.kt


package com.example.jetpack

import android.content.Context
import android.content.res.Configuration
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {

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

        // show the device screen layout size category in text view
        textView.text = applicationContext.screenSizeCategory
    }
}


// extension property to get device screen layout size category
val Context.screenSizeCategory:String
    get() {
        return when(resources.configuration.screenLayout
                and Configuration.SCREENLAYOUT_SIZE_MASK) {
            Configuration.SCREENLAYOUT_SIZE_XLARGE -> "XLarge screen"
            Configuration.SCREENLAYOUT_SIZE_LARGE -> "Large screen"
            Configuration.SCREENLAYOUT_SIZE_NORMAL -> "Normal size screen"
            Configuration.SCREENLAYOUT_SIZE_SMALL -> "Small size screen"
            Configuration.SCREENLAYOUT_SIZE_UNDEFINED -> "Undefined screen size"
            else -> "Error"
        }
    }

activity_main.xml


<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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"
    android:id="@+id/constraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#E5E4E2"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:fontFamily="sans-serif-condensed"
        android:textColor="#191970"
        android:textSize="33sp"
        android:gravity="center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="TextView" />

</androidx.constraintlayout.widget.ConstraintLayout>