How to dynamically change Spinner text size in Kotlin

In this android kotlin source code example, we are going to dynamically change Spinner text size 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 dynamically change Spinner text size 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.SpinnerActivity3">

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt

import android.content.Context
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.view.ViewGroup
import android.widget.ArrayAdapter
import android.widget.Spinner
import android.widget.TextView
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.constraintlayout.widget.ConstraintSet
import com.bluapp.kotlinview.R

class SpinnerActivity3 : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_spinner3)
        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 customArrayAdapter = CustomArrayAdapter<String>(this@SpinnerActivity3, userNames)
        spinner.adapter = customArrayAdapter
        constraintLayout.addView(spinner, conParam)
    }

    internal class CustomArrayAdapter<T>(ctx: Context, objects: Array<T>) :
        ArrayAdapter<T>(ctx, android.R.layout.simple_spinner_item, objects) {
        override
        fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View {
            val view = super.getView(position, convertView, parent)
            val text = view.findViewById(android.R.id.text1) as TextView
            text.setTextSize(25.0f)
            return view
        }
    }
}

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