Create Alert Dialog with Radio Button in Android

In this post, we’ll be creating an alert dialog with a radio button using Material Design 2.0 in our Android apps with Kotlin.

Let’s Create Alert Dialog With Radio Button

Step 1:

• Open Android Studio.
• Create a new project or go to File- New Project.
• Fill all details to create a new project.

Step 2:

First, you need to add the material components dependency in build.gradle

implementation 'com.google.android.material:material:1.3.0'

Step 3 :

Now open your  res/layout/activity_main.xml. file and add the following code.

<?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=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:fontFamily="cursive"
        android:text="Radio Confirmation Dialog"
        android:textColor="@color/black"
        android:textSize="32sp"
        android:textStyle="bold"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_showDialog"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="276dp"
        android:text="Radio Confirmation Dialog"
        android:textAllCaps="false"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />
</androidx.constraintlayout.widget.ConstraintLayout>

Step 4:

After adding the XML file, now open your src/MainActivity.kt file and add the following code.

package com.techpassmaster.radioconfirmationdialog

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.Toast
import com.google.android.material.dialog.MaterialAlertDialogBuilder

/**
 * Created by Techpass Master on 09-May-21.
 * www.techpassmaster.com
 */

class MainActivity : AppCompatActivity() {
    private lateinit var selectedFruits: String
    private var selectedFruitsIndex: Int = 0
    private val fruits = arrayOf("Apple", "Banana", "Coconut", "Orange", "Pineapple", 
                                "Papaya", "Mango", "Blackberries", "Guava")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val showDialog: Button = findViewById(R.id.btn_showDialog)
        // button click listener
        showDialog.setOnClickListener {
        
        // call to function
            showRadioConfirmationDialog()
        }
    }
    // fun for showing dialog with Radio Button
    private fun showRadioConfirmationDialog() {
        selectedFruits = fruits[selectedFruitsIndex]
        MaterialAlertDialogBuilder(this)
                .setTitle("List of Fruits")
                .setSingleChoiceItems(fruits, selectedFruitsIndex) { dialog_, which ->
                    selectedFruitsIndex = which
                    selectedFruits = fruits[which]
                }
                .setPositiveButton("Ok") { dialog, which ->
                    Toast.makeText(this, "$selectedFruits Selected", Toast.LENGTH_SHORT)
                            .show()
                }
                .setNegativeButton("Cancel") { dialog, which ->
                    dialog.dismiss()
                }
                .show()
    }
}

Step 5:

Let’s run and test the application. Connect your Android Mobile device with your computer and click to run from Android Studio. After successfully run your application, your application looks like this.

Read More:

• Android Working With Firebase – Signup And Login Auth.
• Android Interview Questions For Fresher 2021.
• Top 5 Things To Avoid While Developing Android Apps.

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Happy Learning!!!  😊