การแสดงไดอะล็อก Yes/No (AlertDialog)

กดปุ่มแล้วจะแสดง dialog ถ้าตอบ Yes จะปิด app

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Show Me Alert Dialog" />
</LinearLayout>

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

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

android:id="@+id/root_layout"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:padding="16dp">

<Button

android:id="@+id/button"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center"

android:text="Show Me Alert Dialog" />

</LinearLayout>

MainActivity.kt

package com.phaisarn.ktapplication

import android.content.DialogInterface
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.graphics.Color
import android.support.v7.app.AlertDialog
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

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

        // when button is clicked, show the alert
        button.setOnClickListener {
            // build alert dialog
            val dialogBuilder = AlertDialog.Builder(this)

            // set message of alert dialog
            dialogBuilder.setMessage("Do you want to close this application ?")
                    // if the dialog is cancelable
                    .setCancelable(false)
                    // positive button text and action
                    .setPositiveButton("Proceed") { _, _ -> finish() }
                    // negative button text and action
                    .setNegativeButton("Cancel") { dialog, _ -> dialog.cancel() }

            // create dialog box
            val alert = dialogBuilder.create()
            // set title for alert dialog box
            alert.setTitle("AlertDialogExample")
            // show alert dialog
            alert.show()
        }
    }
}

package com.phaisarn.ktapplication

import android.content.DialogInterface

import android.support.v7.app.AppCompatActivity

import android.os.Bundle

import android.graphics.Color

import android.support.v7.app.AlertDialog

import android.widget.Toast

import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

// when button is clicked, show the alert

button.setOnClickListener {

// build alert dialog

val dialogBuilder = AlertDialog.Builder(this)

// set message of alert dialog

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

// if the dialog is cancelable

.setCancelable(false)

// positive button text and action

.setPositiveButton("Proceed") { _, _ -> finish() }

// negative button text and action

.setNegativeButton("Cancel") { dialog, _ -> dialog.cancel() }

// create dialog box

val alert = dialogBuilder.create()

// set title for alert dialog box

alert.setTitle("AlertDialogExample")

// show alert dialog

alert.show()

}

Phaisarn Sutheebanjard

blog.phaisarn.com

การแสดงไดอะล็อก Yes/No (AlertDialog)