Radio Button example in kotlin

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#FF5722"
        android:textSize="30sp"
        android:textStyle="bold"
        android:textAllCaps="true"
        android:padding="10dp"
        android:layout_margin="10dp"
        android:gravity="center"
        android:layout_gravity="center"
        android:id="@+id/tv1"
        />

   

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:id="@+id/rg">
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/r1"
            android:text="Male"></RadioButton>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/r2"
            android:text="Female"></RadioButton>
    </RadioGroup>

</LinearLayout>

MainActivity.kt

package com.androinidan.checkboxkotlin

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.CheckBox
import android.widget.CompoundButton
import android.widget.RadioButton
import android.widget.RadioGroup
import android.widget.Switch
import android.widget.TextView
import android.widget.ToggleButton

class MainActivity : AppCompatActivity() {

     var radiogroup: RadioGroup?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        tv = findViewById(R.id.tv1)



        radiogroup=findViewById(R.id.rg)
        r1=findViewById(R.id.r1)

        radiogroup.setOnCheckedChangeListener{ group, checkedId ->
            if(checkedId==R.id.r1)
                tv!!.text=("MALE")
            else
                tv!!.text=("FEMALE")
        }

        }
    }