In this tutorial we will create alert dialog with single choice from list of items. We will create a button that show alert dialog when that button is clicked, a TextView that shows the selected item from dialog.
Step 1: Create a new project OR Open your project
Step 2: Code
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:padding="20dp"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/showAlertDialogBtn"
android:text="Show Alert Dialog"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/txtView"
android:text="Selected Item"
android:textSize="20sp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
MainActivity.kt
package com.jigopost.myapplication
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.v7.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)
showAlertDialogBtn.setOnClickListener {
val listItems = arrayOf("Item 1", "Item 2", "Item 3")
val mBuilder = AlertDialog.Builder(this@MainActivity)
mBuilder.setTitle("Choose an item")
mBuilder.setSingleChoiceItems(listItems, -1) { dialogInterface, i ->
txtView.text = listItems[i]
dialogInterface.dismiss()
}
// Set the neutral/cancel button click listener
mBuilder.setNeutralButton("Cancel") { dialog, which ->
// Do something when click the neutral button
dialog.cancel()
}
val mDialog = mBuilder.create()
mDialog.show()
}
}
}
Step 3: Output
