How to Generate Barcode in Android?

 <?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:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="@color/white">

    <EditText
        android:id="@+id/et1"
        android:layout_width="239dp"
        android:layout_height="57dp"
        android:layout_marginTop="184dp"
        android:hint="Enter Text"
        android:textColorHint="@color/black"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/img1"
        android:layout_width="292dp"
        android:layout_height="214dp"
        tools:layout_editor_absoluteX="76dp"
        tools:layout_editor_absoluteY="285dp"
        app:layout_constraintTop_toBottomOf="@id/et1"
        android:layout_marginTop="25dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

    <Button
        android:id="@+id/btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/img1"
        android:layout_marginTop="25dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        android:text="Generate Barcode"
        />

 </androidx.constraintlayout.widget.ConstraintLayout>

 import android.graphics.Bitmap
 import android.graphics.Color
 import android.os.Bundle
 import android.widget.Button
 import android.widget.EditText
 import android.widget.ImageView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.MultiFormatWriter


 class MainActivity : AppCompatActivity() {
     private lateinit var et: EditText
     private lateinit var bt: Button
     private lateinit var img: ImageView
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)

        et = findViewById(R.id.et1)
        bt = findViewById(R.id.btn1)
        img = findViewById(R.id.img1)

        bt.setOnClickListener {
            genBarcode()
        }

    }

    private fun genBarcode() {
        val inputValue = et.text.toString().trim()

        if (inputValue.isNotEmpty()) {
            val mwriter = MultiFormatWriter()

            try {
                val matrix =
                     mwriter.encode(inputValue, BarcodeFormat.CODE_128, img.width, img.height)

                 val bitmap = Bitmap.createBitmap(img.width, img.height, Bitmap.Config.RGB_565)

                 for (i in 0 until img.width) {
                     for (j in 0 until img.height) {
                         bitmap.setPixel(i, j, if (matrix[i, j]) Color.BLACK else Color.WHITE)
                     }
                 }

                 img.setImageBitmap(bitmap)
             } catch (e: Exception) {

                Toast.makeText(this, "Exception $e", Toast.LENGTH_SHORT).show()
             }
         } else {
             et.error = "Please enter a value"
         }
     }
 }