android kotlin checkbox example

MainActivity.kt

package com.example.checkboxdemo

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
// author : www.raviroza.com
// date : 2-Jan-2023, 9.00 am
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity()
{
    var ch = mutableSetOf("")
    fun setChoices()
    {
        var t = ""
        for(tt in ch)
        {
            t = t + tt + " "
        }
        lblChoiceList.text = t.toString()
    }

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

        /*chkCricket.setOnClickListener()
        {
            if(chkCricket.isChecked == true)
            {
                ch.add(chkCricket.text.toString())
            }
            else
            {
                ch.remove(chkCricket.text.toString())
            }
            lblChoiceList.text = ch.toString()
        }
        chkFootBall.setOnClickListener()
        {
            if(chkFootBall.isChecked == true)
            {
                ch.add(chkFootBall.text.toString())
            }
            else
            {
                ch.remove(chkFootBall.text.toString())
            }
            lblChoiceList.text = ch.toString()
        }
        chkKabbadi.setOnClickListener()
        {
            if(chkKabbadi.isChecked == true)
            {
                ch.add(chkKabbadi.text.toString())
            }
            else
            {
                ch.remove(chkKabbadi.text.toString())
            }
            lblChoiceList.text = ch.toString()
        }

        chkFootBall.setOnClickListener()
        {
            lblChoiceList.text = lblChoiceList.text.toString() + chkFootBall.text.toString()
        }
        chkKabbadi.setOnClickListener()
        {
            lblChoiceList.text = lblChoiceList.text.toString() + chkKabbadi.text.toString()
        }*/


       chkCricket.setOnCheckedChangeListener { buttonView, isChecked ->
            if (isChecked)
            {
                ch.add(buttonView.text.toString())
                setChoices()
            }
            else
            {
                ch.remove(buttonView.text.toString())
                setChoices()
            }
        }
        chkFootBall.setOnCheckedChangeListener { buttonView, isChecked ->
            if (isChecked)
            {
                ch.add(buttonView.text.toString())
                setChoices()
            }
            else
            {
                ch.remove(buttonView.text.toString())
                setChoices()
            }
        }
        chkKabbadi.setOnCheckedChangeListener { buttonView, isChecked ->
            if (isChecked)
            {
                ch.add(buttonView.text.toString())
                setChoices()
            }
            else
            {
                ch.remove(buttonView.text.toString())
                setChoices()
            }
        }
    }
}

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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="4dp"
android:background="@color/MainColor"
    tools:context=".MainActivity" >

    <LinearLayout
        android:background="@color/SubColor"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:id="@+id/lblHead"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp"
            android:background="#2196F3"
            android:gravity="center"
            android:text="Check Box Demo"
            android:textColor="#232031"
            android:textSize="30sp" />

        <TextView
            android:id="@+id/lblSubHead"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp"
            android:gravity="center"
            android:text="Select Your Game"
            android:textSize="18sp" />

        <CheckBox
            android:id="@+id/chkCricket"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp"
            android:text="@string/cricket"
            android:textSize="18sp" />

        <CheckBox
            android:id="@+id/chkKabbadi"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp"
            android:text="@string/Kabbadi"
            android:textSize="18sp" />

        <CheckBox
            android:id="@+id/chkFootBall"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp"
            android:text="@string/Football"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/lblHereAreYourChoices"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="4dp"
            android:gravity="center"
            android:background="#4876a8"
            android:text="Your Choices are "
            android:textSize="18sp" />

        <TextView
            android:id="@+id/lblChoiceList"
            android:layout_width="match_parent"
            android:layout_height="301dp"
            android:layout_margin="4dp"
            android:gravity="center_horizontal"
            android:text=".... "
            android:textSize="18sp" />

    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>