How to add onItemSelectedListener listener to Spinner in Kotlin

In this android kotlin source code example, we are going to add onItemSelectedListener listener to Spinner in Kotlin.

You can copy and adopt this source code example to your Kotlin android project without reinventing the wheel.

Below is a step by step source code to add onItemSelectedListener listener to Spinner in Kotlin.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
    android:padding="24dp"
    tools:context=".spinner.SpinnerActivity16">

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.AdapterView
import android.widget.ArrayAdapter
import android.widget.Spinner
import android.widget.Toast
import com.bluapp.kotlinview.R

class SpinnerActivity16 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_spinner16)
        val spinner = findViewById(R.id.spinner) as Spinner
        val userNames = arrayOf("Henry", "Mark", "Jack", "Smith", "Clark", "Kelvin", "Denzel")
        val arrayadapter = ArrayAdapter(this@SpinnerActivity16, android.R.layout.simple_spinner_item, userNames)
        spinner.adapter = arrayadapter
        spinner.onItemSelectedListener = object  : AdapterView.OnItemSelectedListener{
            override fun onItemSelected(parent: AdapterView<*>?, p1: View?, p2: Int, p3: Long) {
                Toast.makeText(this@SpinnerActivity16, parent?.getItemAtPosition(p2).toString(), Toast.LENGTH_LONG).show()
            }

            override fun onNothingSelected(parent: AdapterView<*>?) {

            }
        }
    }
}

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