How to Display a Yes/No DialogBox in Android?

DialogBox is used in many android applications to display dialogs. There are different types of dialogs that are displayed within android applications such as AlertDialog, warning dialogs, and others. In this article, we will take a look at How to Display a Yes/No Dialog Box in Android. A sample video is given below to get an idea about what we are going to do in this article.

Note: This Android article covered in both Java and Kotlin languages. 

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.

Step 2: Working with the activity_main.xml file

Navigate to app > res > layout > activity_main.xml and add the below code to it. Comments are added in the code to get to know in detail. 

XML

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <!--on below line we are creating
        a text for heading of our app-->
    <TextView
        android:id="@+id/idTVHeading"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_above="@id/idBtnDisplayDialog"
        android:layout_margin="20dp"
        android:gravity="center"
        android:padding="4dp"
        android:text="Yes/No Dialog Box"
        android:textAlignment="center"
        android:textColor="@color/purple_200"
        android:textSize="20sp"
        android:textStyle="bold" />

    <!--on below line we are creating a
        button for displaying a dialog-->
    <Button
        android:id="@+id/idBtnDisplayDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_margin="20dp"
        android:text="Show Dialog"
        android:textAllCaps="false" />

</RelativeLayout>

Step 3: Working with the MainActivity file 

Navigate to app > java > your app’s package name > MainActivity file and add the below code to it. Comments are added in the code to get to know in detail. 

Kotlin

package com.gtappdevelopers.kotlingfgproject

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

class MainActivity : AppCompatActivity() {

    // on below line we are creating
    // variable for image view.
    lateinit var dialogBtn: Button

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

        // on below line we are initializing our variable with id.
        dialogBtn = findViewById(R.id.idBtnDisplayDialog)

        // on below line we are adding click listener for our button.
        dialogBtn.setOnClickListener {

            // on below line we are creating a dialog click listener
            // variable and initializing it.
            val dialogClickListener =
                DialogInterface.OnClickListener { dialog, which ->
                    when (which) {
                        // on below line we are setting a click listener
                        // for our positive button
                        DialogInterface.BUTTON_POSITIVE -> {
                            // on below line we are displaying a toast message.
                            Toast.makeText(this, "Yes clicked", Toast.LENGTH_SHORT).show()
                        }

                        // on below line we are setting click listener
                        // for our negative button.
                        DialogInterface.BUTTON_NEGATIVE -> {
                            // on below line we are dismissing our dialog box.
                            dialog.dismiss()
                        }
                    }
                }

            // on below line we are creating a builder variable for our alert dialog
            val builder: AlertDialog.Builder = AlertDialog.Builder(this)

            // on below line we are setting message for our dialog box.
            builder.setMessage("Select yes to display toast message and no to dismiss the dialog ?")
                // on below line we are setting positive
                // button and setting text to it.
                .setPositiveButton("Yes", dialogClickListener)
                // on below line we are setting negative button
                // and setting text to it.
                .setNegativeButton("No", dialogClickListener)
                // on below line we are calling
                // show to display our dialog.
                .show()
        }
    }
}

Java

package com.gtappdevelopers.kotlingfgproject;

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    // on below line we are creating a variable for our button.
    private Button dialogBtn;
    private DialogInterface.OnClickListener dialogClickListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // on below line we are initializing variables with ids.
        dialogBtn = findViewById(R.id.idBtnDisplayDialog);

        // on below line we are adding click listener for our dialog button
        dialogBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // on below line we are creating a dialog click listener
                // variable and initializing it.
                dialogClickListener = new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch (which) {
                            // on below line we are setting a click listener
                            // for our positive button
                            case DialogInterface.BUTTON_POSITIVE:
                                // on below line we are displaying a toast message.
                                Toast.makeText(MainActivity.this, "Yes clicked", Toast.LENGTH_SHORT).show();
                                break;
                            // on below line we are setting click listener
                            // for our negative button.
                            case DialogInterface.BUTTON_NEGATIVE:
                                // on below line we are dismissing our dialog box.
                                dialog.dismiss();

                        }
                    }
                };
                // on below line we are creating a builder variable for our alert dialog
                AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
                // on below line we are setting message for our dialog box.
                builder.setMessage("Select yes to display toast message and no to dismiss the dialog ?")
                        // on below line we are setting positive button
                        // and setting text to it.
                        .setPositiveButton("Yes", dialogClickListener)
                        // on below line we are setting negative button
                        // and setting text to it.
                        .setNegativeButton("No", dialogClickListener)
                        // on below line we are calling
                        // show to display our dialog.
                        .show();

            }
        });
    }
}

Now run your application to see the output of it. 

Output: