แสดงไดอะล็อกด้วย AlertDialog.setItems()

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:id="@+id/layoutRoot" 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.graphics.Color import android.os.Bundle import android.widget.Toast 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 { // Initialize an array of colors val arrColor = arrayOf("RED", "GREEN", "YELLOW", "BLACK", "MAGENTA") // Initialize a new instance of alert dialog builder object val builder = AlertDialog.Builder(this) // Set a title for alert dialog builder.setTitle("Choose a color.") builder.setItems(arrColor) { _, which -> // Get the dialog selected item val color = arrColor[which] // Try to parse user selected color string try { // Change the layout background color using user selection layoutRoot.setBackgroundColor(Color.parseColor(color)) Toast.makeText(this, "$color color selected.", Toast.LENGTH_SHORT).show() } catch (e: IllegalArgumentException) { // Catch the color string parse exception Toast.makeText(this, "$color color not supported.", Toast.LENGTH_SHORT).show() } } // Initialize the AlertDialog using builder object val dialog = builder.create() // Finally, display the alert dialog dialog.show() } } }
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