How to select a Spinner item value in Kotlin

In this android kotlin source code example, we are going to select a Spinner item value 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 select a Spinner item value 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:id="@+id/constraintLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="24dp"
    tools:context=".spinner.SpinnerActivity9">

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.ViewGroup
import android.widget.*
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.constraintlayout.widget.ConstraintSet
import com.bluapp.kotlinview.R

class SpinnerActivity9 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_spinner9)
        val constraintLayout = findViewById(R.id.constraintLayout) as ConstraintLayout
        val conParam = ConstraintLayout.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.WRAP_CONTENT
        )
        conParam.topToTop = ConstraintSet.PARENT_ID
        conParam.bottomToBottom = ConstraintSet.PARENT_ID
        conParam.startToStart = ConstraintSet.PARENT_ID
        conParam.endToEnd = ConstraintSet.PARENT_ID
        val spinner = Spinner(this)
        val userNames = arrayOf("Henry", "Mark", "Jack", "Smith", "Clark", "Kelvin", "Denzel")
        val arrayadapter = ArrayAdapter(this@SpinnerActivity9, android.R.layout.simple_spinner_item, userNames)
        spinner.adapter = arrayadapter
        val spinnerPosition = arrayadapter.getPosition("Smith")
        spinner.setSelection(spinnerPosition)
        constraintLayout.addView(spinner, conParam)
    }
}

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