How to Generate QR Code in Android using Kotlin

implementation 'android mods. library.QR generator: QRGenerator:1.0.3'

<?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/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

// This label is use normally so the information
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:text="QR code generate"
android:textColor="@color/black
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

//  This image  generate QR code content
<ImageView
android:id="@+id/idIVQrcode"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_marginTop="32dp"
android:contentDescription="QR Code"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.497"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />

//Enter any type of text  in edit text

<android.appcompat.widget.AppCompatEditText
android:id="@+id/appCompatEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="340dp"
android:layout_marginEnd="20dp"
android:hint=" QR code data"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.473"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />

// Click the no button then generate the QR code
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="44dp"
android:layout_marginStart="20dp"
android:layout_marginEnd="20dp"
android:text="submit"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/appCompatEditText" />

</androidx.constraintlayout.widget.ConstraintLayout>

import android.graphics.Bitmap
import android.graphics.Point
import android.os.Bundle
import android.text.TextUtils
import android.view.Display
import android.view.WindowManager
import android.widget.Button
import android.widget.EditText
import android.widget.ImageView
import android.widget.Toast

class MainActivity : AppCompatActivity() {

// for our image view, edit text and a button.
lateinit var qrIV: ImageView
lateinit var msgEdt: EditText
lateinit var generateQRBtn: Button

// a variable for bitmap
lateinit var bitmap: Bitmap

// a variable for qr encoder.
lateinit var qrEncoder: QREncoder

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

// initializing all our variables.
qrIV = findViewById(R.id.idIVQrcode)
msgEdt = findViewById(R.id.idEdt)
generateQRBtn = findViewById(R.id.idBtnGenerateQR)

// listener for our generated QR button.
generateQRBtn.setOnClickListener {
// on the below line we are checking if msg edit text is empty or not.
if (TextUtils.isEmpty(msgEdt.text.toString())) {

// on below line we are displaying toast message to display enter some text
Toast.makeText(applicationContext, "Enter your message", Toast.LENGTH_SHORT).show()
} else {
// on below line we are getting service for window managerval windowManager: WindowManager = getSystemService(WINDOW_SERVICE) as WindowManager

// variable for our default display
val display: Display = windowManager.defaultDisplay

// for point which is use to display in qr code
val point: Point = Point()
display.getSize(point)

// height and width of our point
val width = point.x
val height = point.y

// dimensions for width and height
var dimen = if (width < height) width else height
dimen = dimen * 3 / 4

// on below line we are initializing our qr encoder
qrEncoder = QRGEncoder(msgEdt.text.toString(), null, QRGContents.Type.TEXT, dimen)

// on below line we are running a try
// and catch block for initializing our bitmap
try {
// initializing our bitmap
bitmap = qrEncoder.encodeAsBitmap()

//This bitmap to our image view
qrIV.setImageBitmap(bitmap)
} catch (e: Exception) {

// are handling exception
e.printStackTrace()

}}}}