How to dynamically get the selected Radio Button in Kotlin

In this android kotlin source code example, we are going to dynamically get the selected Radio Button 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 dynamically get the selected Radio Button 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.TextViewAndRadioButtonActivity20">

    <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>

    <Button
        android:id="@+id/getRadioBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:text="Get Selected RadioButton"
        android:textColor="#ffffff"
        android:layout_marginTop="10dp"
        app:layout_constraintTop_toBottomOf="@id/radioGroup"/>


</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

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

class TextViewAndRadioButtonActivity20 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_text_view_and_radio_button20)
        val radioGroup = findViewById(R.id.radioGroup) as RadioGroup
        val getRadioBtn = findViewById(R.id.getRadioBtn) as Button
        getRadioBtn.setOnClickListener {
            val selectedId = radioGroup.checkedRadioButtonId
            val radioButton = findViewById(selectedId) as RadioButton
            Toast.makeText(this@TextViewAndRadioButtonActivity20, "Selected RadioButton: "+radioButton.text, Toast.LENGTH_LONG).show()
        }
    }
}

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