Android RadioGroup Example Kotlin

On Android, a RadioGroup is a widget that groups multiple radio buttons. This allows the user to choose one option from a set of mutually exclusive options.

Here is the tutorial for Java

Here is a simple example of using a RadioGroup in a RadioButton element:

There Are Some Common Attributes for RadioGroup

Step 1 :

File open res/layout/activity_main.xml file −

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:layout_margin="20dp"
        android:orientation="vertical">

        <RadioGroup
            android:id="@+id/radioGroup"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <RadioButton android:id="@+id/radio_mango"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Mango"/>
            <RadioButton android:id="@+id/radio_banana"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Banana"/>
            <RadioButton android:id="@+id/radio_orange"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Orange"/>
        </RadioGroup>


        <Button
            android:id="@+id/buttonSubmit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Submit" />

        <TextView
            android:id="@+id/textResult"
            android:layout_width="match_parent"
            android:gravity="center"
            android:textSize="20dp"
            android:layout_marginTop="20dp"
            android:layout_height="wrap_content"
            android:text="Show Result" />
    </LinearLayout>



</RelativeLayout>

Step 2 :

File open com.microappvalley.newtestproject/MainActivity.java file −

package com.microappvalley.newtestproject

import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.RadioButton
import android.widget.RadioGroup

import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity


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

        val buttonSubmit: Button =findViewById(R.id.buttonSubmit)
        val radioGroup: RadioGroup =findViewById(R.id.radioGroup)
        val textResult: TextView =findViewById(R.id.textResult)

        buttonSubmit.setOnClickListener {
            var id=0;
            id=radioGroup.checkedRadioButtonId

            if (id==View.NO_ID){
                Toast.makeText(this@MainActivity,"No Chackd",Toast.LENGTH_SHORT).show()

            }else{
                val selectedRadioButton: RadioButton=findViewById(id)
                textResult.text=selectedRadioButton.text.toString()
                Toast.makeText(this@MainActivity,selectedRadioButton.text,Toast.LENGTH_SHORT).show()

            }
        }
    }
}

Open Device Manager, run the emulator, and then run the application. Next, check the working output and check the output you declared in your code.