How to add Radio Group OnCheckedChangeListener event in Kotlin

In this android kotlin source code example, we are going to add Radio Group OnCheckedChangeListener event in Kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to add Radio Group OnCheckedChangeListener event in Kotlin.

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"
    tools:context=".TextViewAndRadioButton.TextViewAndRadioButtonActivity17">

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent">
        <RadioButton
            android:id="@+id/maleBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Male"/>
        <RadioButton
            android:id="@+id/femaleBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Female"/>
    </RadioGroup>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.RadioGroup
import android.widget.Toast
import com.bluapp.kotlinview.R

class TextViewAndRadioButtonActivity17 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_text_view_and_radio_button17)
        val radioGroup = findViewById(R.id.radioGroup) as RadioGroup
        radioGroup.setOnCheckedChangeListener(RadioGroup.OnCheckedChangeListener { radioGroup, i ->
            if(i == R.id.maleBtn){
                Toast.makeText(this@TextViewAndRadioButtonActivity17, "Male Selected", Toast.LENGTH_LONG).show()
            }else if(i == R.id.femaleBtn){
                Toast.makeText(this@TextViewAndRadioButtonActivity17, "Female Selected", Toast.LENGTH_LONG).show()
            }
        })
    }
}

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