How to create a SingleChoice AlertDialog in Android (Kotlin)

     DESCRIPTION     

In this tutorial we will create alert dialog with single choice from list of items. We will create a button that show alert dialog when that button is clicked, a TextView that shows the selected item from dialog.

     VIDEO     

     SOURCE CODE     

Step 1: Create a new project OR Open your project

Step 2: Code

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"
    android:padding="20dp"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/showAlertDialogBtn"
        android:text="Show Alert Dialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/txtView"
        android:text="Selected Item"
        android:textSize="20sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.kt

package com.blogspot.atifsoftwares.myapplication

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v7.app.AlertDialog
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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

        showAlertDialogBtn.setOnClickListener {
            val listItems = arrayOf("Item 1", "Item 2", "Item 3")
            val mBuilder = AlertDialog.Builder(this@MainActivity)
            mBuilder.setTitle("Choose an item")
            mBuilder.setSingleChoiceItems(listItems, -1) { dialogInterface, i ->
                txtView.text = listItems[i]
                dialogInterface.dismiss()
            }
            // Set the neutral/cancel button click listener
            mBuilder.setNeutralButton("Cancel") { dialog, which ->
                // Do something when click the neutral button
                dialog.cancel()
            }

            val mDialog = mBuilder.create()
            mDialog.show()
        }

    }
}

Step 3: Output

SingleChoice AlertDialog in Android (Kotlin)

SingleChoice AlertDialog in Android (Kotlin)

SingleChoice AlertDialog in Android (Kotlin)