กดปุ่มแล้วจะแสดง dialog ถ้าตอบ Proceed จะปิด app

ไฟล์ที่เกี่ยวข้อง
- activity_main.xml
- MainActivity.kt
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <Button android:id="@+id/btnShowAlert" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Show Alert" 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.kt
package com.phaisarn.myapplication import android.os.Bundle import androidx.appcompat.app.AppCompatActivity import androidx.appcompat.app.AlertDialog 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 btnShowAlert.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() } } }
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