What Is Alert Dialog In Android

MAIN.XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:id="@+id/button"
        android:layout_width="185dp"
        android:layout_height="100dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="220dp"
        android:layout_marginEnd="160dp"
        android:layout_marginBottom="8dp"
        android:text="Alert"
        android:textSize="25dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.007" />
</android.support.constraint.ConstraintLayout>


MAINACTIVITY.JAVA
package com.example.alertdialogexample;

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ViewAnimator;

import java.net.InterfaceAddress;

public class MainActivity extends AppCompatActivity {
   private static Button button_sub;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        onButtonClickListener();
    }
     public void onButtonClickListener()
     {
         button_sub=(Button)findViewById(R.id.button);
         button_sub.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 AlertDialog.Builder a_builder=new AlertDialog.Builder(MainActivity.this);
                 a_builder.setMessage("Do you want to close this apps!!!").setCancelable(false)
                         .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
                                 finish();
                             }
                         })
                         .setNegativeButton("No", new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
                                 dialog.cancel();
                              }
                         });
                 AlertDialog  alert =a_builder.create();
                 alert.setTitle("Alert !!!");
                 alert.show();




             }
         });


     }
}

                                                

                                               

If  we are click on the no button then Alert app is not will be close.

click on the yes button then close this app.

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About EasyToCode

I'm Ethan Mariano a software engineer by profession and reader/writter by passion.I have good understanding and knowledge of AngularJS, Database, javascript, web development, digital marketing and exploring other technologies related to Software development.