activity_main.xml 

<?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"> 
 
    <Button 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:id="@+id/button" 
        android:text="Close app" 
        app:layout_constraintBottom_toBottomOf="parent" 
        app:layout_constraintLeft_toLeftOf="parent" 
        app:layout_constraintRight_toRightOf="parent" 
        app:layout_constraintTop_toTopOf="parent" /> 
 
</androidx.constraintlayout.widget.ConstraintLayout> 
 

MainActivity.java 

package com.example.alert_dialog; 
 
import androidx.appcompat.app.AlertDialog; 
import androidx.appcompat.app.AppCompatActivity; 
 

import android.content.DialogInterface; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.Toast; 
 
public class MainActivity extends AppCompatActivity { 
 
    Button closeButton; 
    AlertDialog.Builder builder; 
 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
 
        closeButton=(Button)findViewById(R.id.button); 
 
        builder=new AlertDialog.Builder(this); 
 
        closeButton.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View view) { 
                builder.setMessage("Do you want to close this application ?") 
                .setCancelable(false) 
                        .setPositiveButton("Yes", new 
DialogInterface.OnClickListener(){ 
                            public void onClick(DialogInterface dialog, int id){ 
                                finish(); 
                        Toast.makeText(getApplicationContext(), "you choose yes 
action for alertbox", 
                                Toast.LENGTH_SHORT).show(); 

                    } 
                }) 
                        .setNegativeButton("No", new 
DialogInterface.OnClickListener() { 
                            @Override 
                            public void onClick(DialogInterface dialogInterface, int 
id) { 
                                dialogInterface.cancel(); 
                                Toast.makeText(getApplicationContext(), "you choose 
no action for alertbox", 
                                        Toast.LENGTH_SHORT).show(); 
                            } 
                        }); 
 
                AlertDialog alert= builder.create(); 
                alert.setTitle("AlertDialogExample"); 
                alert.show(); 
            } 
        }); 
    } 
}