alert dialog android kotlin example

alert dialog android kotlin example

Today learn tutorial alert dialog android kotlin example the following example full source code.

Android AlertDialog is a subclass of Dialog class. It is used to prompt a small dialog window to make a decision before a user can proceed in the same activity.

1.MainActivity.kt:

package com.akash.alertdialogbox

import android.content.DialogInterface

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.view.View

import android.widget.Button

import android.app.AlertDialog

import android.widget.Toast

class MainActivity:AppCompatActivity() {

  internal var closeButton:Button

  internal var builder:AlertDialog.Builder

  protected fun onCreate(savedInstanceState:Bundle) {

    super.onCreate(savedInstanceState)

    setContentView(R.layout.activity_main)

    closeButton = findViewById(R.id.button) as Button

    builder = AlertDialog.Builder(this)

    closeButton.setOnClickListener(object:View.OnClickListener() {

      fun onClick(v:View) {

        //Uncomment the below code to Set the message and title from the strings.xml file

        builder.setMessage(R.string.dialog_message).setTitle(R.string.dialog_title)

        //Setting message manually and performing action on button click

        builder.setMessage("Do you want to close this application ?")

        .setCancelable(false)

        .setPositiveButton("Yes", object:DialogInterface.OnClickListener() {

          fun onClick(dialog:DialogInterface, id:Int) {

            finish()

            Toast.makeText(getApplicationContext(), "you choose yes action for alertbox",

                           Toast.LENGTH_SHORT).show()

          }

        })

        .setNegativeButton("No", object:DialogInterface.OnClickListener() {

          fun onClick(dialog:DialogInterface, id:Int) {

            // Action for 'NO' Button

            dialog.cancel()

            Toast.makeText(getApplicationContext(), "you choose no action for alertbox",

                           Toast.LENGTH_SHORT).show()

          }

        })

        //Creating dialog box

        val alert = builder.create()

        //Setting the title manually

        alert.setTitle("AlertDialogExample")

        alert.show()

      }

    })

  }

}

2.activity_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="example.javatpoint.com.alertdialog.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" />

</android.support.constraint.ConstraintLayout>

3.AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.akash.alertdialogbox">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>