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>

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