How to Set Buttons Inside an Alert Dialog in Android?

In this article, we are going to see how can we set two buttons inside an Alert Dialog. For example, we can see when an alert dialog is pop up then their two types of buttons available one is the Ok or Positive Button another one is Cancel or Negative Button. Alert dialogs are most frequently used in Android applications to display information to the user. An Alert dialog consists of a Message, Title, and some Buttons to respond to the displayed information.

In this article, we will learn how to create an alert dialog in Android with two buttons: a positive button and a negative button. Basically, An Positive Button Confirms a user’s response and continues but A Negative Button will Dismiss the Alert Dialog Window. For Implementing these Buttons inside an Alert Dialog we have to follow several steps :

1. Create an instance of the AlertDialog.Builder class.
2. Set the title, message, and other properties of the alert dialog using  AlertDialog.Builder class.
3. Call the setPositiveButton(), setNegativeButton() methods of the AlertDialog.Builder class to set the buttons of the alert dialog.
4. Implement the onClick() method for each button to define what should happen when the user clicks the button.
5. Call the create() method of the AlertDialog.Builder class to create the alert dialog.
6. Call the show() method of the AlertDialog class to display the alert dialog to the user.

A sample video is given below to get an idea about what we are going to do in this article.

Step By Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Kotlin as the programming language.

Step 2: Change the StatusBar Color

Navigate to app > res > values > themes > themes.xml and add the below code under the style section in the themes.xml file.

<item name="android:statusBarColor" tools:targetApi="l">#308d46</item>

Step 3: Working with the activity_main.xml file

Navigate to the app > res > layout > activity_main.xml and add the below code to the activity_main.xml file. In this code, we are going to implement a Button by clicking this button an Alert Dialog with two buttons will pop up.

activity_main.xml:

XML

<?xml version="1.0" encoding="utf-8"?>
<!-- LinearLayout orientation Vertical-->
<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:orientation="vertical"
    android:gravity="center"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

      <!-- Button -->
    <Button
        android:id="@+id/open"
        android:layout_width="wrap_content"
        android:text="Click to Open Alert Dialog "
        android:layout_height="wrap_content"/>

</LinearLayout>

Step 4: Working with the MainActivity.kt file

In this step, we are going to apply onclickListner to the button so that when the user clicks the button an alert dialog will open with two buttons. Below is the code for MainActivity.kt. Comments are added for a better understanding of the Code. The below function is Responsible for populating the alert dialog with Two Button (i.e. Positive Button- OK and NegativeButton – Cancel).

fun showDialog(context: Context, title: String, mess: String) {
       // Create a new instance of the AlertDialog.Builder class
       val builder = AlertDialog.Builder(context)
       builder.setTitle(title)//Set the tittle
       builder.setMessage(mess)//Set the message of the dialog
       builder.setPositiveButton("OK") { _, _ ->
           // Implement the Code when OK Button is Clicked
           Toast.makeText(this,"You press OK button",Toast.LENGTH_SHORT).show()
       }
       builder.setNegativeButton("Cancel") { dialog, _ ->
           // Implement the Code when Cancel Button is CLiked
           dialog.dismiss() //Close or dismiss the alert dialog
           Toast.makeText(this,"You press Cancel button",Toast.LENGTH_SHORT).show()
       }
       builder.setCancelable(false)
       val dialog = builder.create()
       dialog.show()
}

Below is the Implementation of MainActivity.kt.

MainActivity.kt:

Kotlin

package com.example.geeksforgeeks

import android.content.Context
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AlertDialog

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

          // find the button by it's ID
        val open_btn:Button=findViewById(R.id.open)

          // Apply OnClickListner to the Button
        open_btn.setOnClickListener {
            showDialog(this,"Alert Dialog","This is a Alert Dialog with Two Buttons in Android")

        }
    }

      // funtion to Create an Dialog and set two Buttons inside it
    fun showDialog(context: Context, title: String, mess: String) {
        // Create a new instance of the AlertDialog.Builder class
        val builder = AlertDialog.Builder(context)

          // Set the tittle
        builder.setTitle(title)

          // Set the message of the dialog
        builder.setMessage(mess)
        builder.setPositiveButton("OK") { _, _ ->
            // Implement the Code when OK Button is Clicked
            Toast.makeText(this,"You press OK button",Toast.LENGTH_SHORT).show()
        }
        builder.setNegativeButton("Cancel") { dialog, _ ->
            // Implement the Code when Cancel Button is CLiked
              // Close or dismiss the alert dialog
            dialog.dismiss()
            Toast.makeText(this,"You press Cancel button",Toast.LENGTH_SHORT).show()

        }
        builder.setCancelable(false)
        val dialog = builder.create()
        dialog.show()
    }

}

Output: