How to Generate QR Code 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"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/etText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="38dp"
        android:layout_marginEnd="32dp"
        android:ems="10"
        android:hint="Enter text here"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <Button
        android:id="@+id/btnGenerate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Generate code"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/etText" />
  
    <ImageView
        android:id="@+id/imageCode"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="32dp"
        android:layout_marginTop="100dp"
        android:layout_marginEnd="32dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/btnGenerate"/>
 </androidx.constraintlayout.widget.ConstraintLayout>

 import android.os.Bundle
 import android.view.View
 import android.view.inputmethod.InputMethodManager
 import android.widget.Button
 import android.widget.EditText
 import android.widget.ImageView
 import androidx.appcompat.app.AppCompatActivity
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.MultiFormatWriter
 import com.google.zxing.WriterException
 import com.journeyapps.barcodescanner.BarcodeEncoder


 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
         val btnGenerate = findViewById<Button>(R.id.btnGenerate)
         val etText = findViewById<EditText>(R.id.etText)
         val imageCode = findViewById<ImageView>(R.id.imageCode)
         btnGenerate.setOnClickListener { v: View? ->
            val myText = etText.text.toString().trim { it <= ' ' }
            val mWriter = MultiFormatWriter()
            try {
                val mMatrix = mWriter.encode(myText, BarcodeFormat.QR_CODE, 1000, 1000)
                val mEncoder = BarcodeEncoder()
                val mBitmap =
                    mEncoder.createBitmap(mMatrix)
                imageCode.setImageBitmap(mBitmap)
                val manager =
                    getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
                manager.hideSoftInputFromWindow(etText.applicationWindowToken, 0)
             } catch (e: WriterException) {
                 e.printStackTrace()
             }
         }
     }
 }