Generate QR Code using Kotlin (Android)

ZXing Android Embedded library

1. Add zxing-android-embedded dependency in the module's build.gradle file:

app/build.gradle

dependencies {
    implementation 'com.journeyapps:zxing-android-embedded:4.3.0'
}

2. Add ImageView element in the layout XML file:

app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/myImageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:contentDescription="QR Code" />

</RelativeLayout>

3. Generate QR code:

app/src/main/java/com/example/app/MainActivity.kt

package com.example.app

import android.os.Bundle
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import com.google.zxing.BarcodeFormat
import com.journeyapps.barcodescanner.BarcodeEncoder

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

        val text = "Hello"

        val encoder = BarcodeEncoder()
        val bitmap = encoder.encodeBitmap(text, BarcodeFormat.QR_CODE, 400, 400)
        val myImageView: ImageView = findViewById(R.id.myImageView)
        myImageView.setImageBitmap(bitmap)
    }
}