How to use Spinner notifyDataSetChange in Kotlin

In this android kotlin source code example, we are going to use Spinner notifyDataSetChange 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 use Spinner notifyDataSetChange 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.SpinnerActivity18">

    <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"/>

    <Button
        android:id="@+id/newuserNamesBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:textColor="#ffffff"
        android:text="Add New UserNames"
        android:layout_marginTop="10dp"
        app:layout_constraintTop_toBottomOf="@id/spinner"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.ArrayAdapter
import android.widget.Button
import android.widget.Spinner
import com.bluapp.kotlinview.R
import java.util.ArrayList

class SpinnerActivity18 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_spinner18)
        val spinner = findViewById(R.id.spinner) as Spinner
        val newuserNamesBtn = findViewById(R.id.newuserNamesBtn) as Button
        val userNames = ArrayList<String>()
        userNames.add("Henry")
        userNames.add("Mark")
        userNames.add("Jack")
        userNames.add("Smith")
        userNames.add("Clark")
        val arrayadapter = ArrayAdapter(this@SpinnerActivity18, android.R.layout.simple_spinner_item, userNames)
        spinner.adapter = arrayadapter
        newuserNamesBtn.setOnClickListener {
            userNames.add("Kelvin")
            userNames.add("Denzel")
            arrayadapter.notifyDataSetChanged()
        }
    }
}

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