How to get AdapterView from adapter?

Question

Android

There are simple Layout files myspiner.xml offline_game.xml:

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<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary"
    android:gravity="top"
    android:singleLine="true"
    android:includeFontPadding="false"
    android:lineSpacingExtra="0dp" />

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<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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.support.constraint.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.82" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.11" />

    <Spinner
        android:id="@+id/Galactic_size"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="@color/colorPrimaryDark"
        app:layout_constraintBottom_toTopOf="@+id/guideline2"
        app:layout_constraintEnd_toStartOf="@+id/guideline"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

The simplest set of strings.xml :

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<string-array name="Galactic_Size">
        <item>Малая​|ﺃ</item>
        <item>Средняя|ﺃ</item>
        <item>Большая|ﺃ</item>
    </string-array>

And finally, the simplest Kotlin code that dynamically selects the font size for the size of the spinner:

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StartGameButton.setOnClickListener {
            setContentView(R.layout.offline_game)
            //val spinner = findViewById<Spinner>(R.id.Galactic_size)
            val adapter = ArrayAdapter.createFromResource(this, R.array.Galactic_Size, R.layout.myspiner)
            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
            /*spinner*/Galactic_size.adapter = adapter

//Неудачная попытка№ 1
            //Galactic_size.getChildAt(0).findViewById<TextView>(text1.id).setTextSize(TypedValue.COMPLEX_UNIT_PX, 50f)
//Неудачная попытка№ 2
            //Galactic_size.findViewById<TextView>(text1.id).setTextSize(TypedValue.COMPLEX_UNIT_PX, 50f)
//Неудачная попытка№ 3
            //(Galactic_size.adapter.getItem(0) as TextView).setTextSize(TypedValue.COMPLEX_UNIT_PX, 50f)

//Работающий но часто вызываемый лишний раз метод
            val OnCatSpinnerCL = object : AdapterView.OnItemSelectedListener {
                override fun onItemSelected(parent: AdapterView<*>, view: View, pos: Int, id: Long) {
                    val TAG = "myLogs"
                    Log.d(TAG, "Начало")
                    var finalTextSize=14f
                    val paint = Paint(Paint.ANTI_ALIAS_FLAG or Paint.LINEAR_TEXT_FLAG)
                    paint.style = Paint.Style.FILL
                    //paint.color = color
                    //paint.textAlign = Paint.Align.CENTER
                    paint.textSize = 100f //размер шрифта в **пикселях**
                    val bounds = Rect()
                    var textheight = 0
                    var textwidth = 0
                    for (i in resources.getStringArray(R.array.Galactic_Size).indices) {
                        val text = resources.getStringArray(R.array.Galactic_Size)[i]
                        paint.getTextBounds(text, 0, text.length, bounds)
                        Log.d(TAG, bounds.height().toString() + " : " + bounds.width().toString())
                        if (textheight < bounds.height()) textheight = bounds.height()//высота
                        if (textwidth < bounds.width()) textwidth = bounds.width()//ширина
                    }
                    Log.d(TAG, textheight.toString() + " : " + textwidth.toString())
                    Log.d(TAG, Galactic_size.measuredHeight.toString() + " : " + (parent.getChildAt(0) as TextView).measuredHeight.toString())
                    if (Galactic_size.measuredHeight.toFloat() / (textheight.toFloat() / 95f) < Galactic_size.measuredWidth.toFloat() / (textwidth.toFloat() / 95f)){
                        finalTextSize=Galactic_size.measuredHeight.toFloat() / (textheight.toFloat() / 95f)
                    }else{
                        finalTextSize=Galactic_size.measuredWidth.toFloat() / (textwidth.toFloat() / 95f)
                    }
                    Log.d(TAG, finalTextSize.toString())
                            (parent.getChildAt(0) as TextView).setTextColor(Color.BLUE)
                            (parent.getChildAt(0) as TextView).setTextSize(TypedValue.COMPLEX_UNIT_PX, finalTextSize)
                }
                override fun onNothingSelected(parent: AdapterView<*>) {
                }
            }
            Galactic_size.onItemSelectedListener = OnCatSpinnerCL
        }

Essence of the question: Galactic_size.onItemSelectedListener = OnCatSpinnerCL - makes all the code work every time an item is selected. (parent.getChildAt(0) as TextView).setTextSize(TypedValue.COMPLEX_UNIT_PX, finalTextSize) is the only thing I actually need, but it only works because parent: AdapterView<*> is passed to it. As a result, I want to know how, after assigning Galactic_size.adapter = adapter, to get an instance of the text1 element created for it in order to change its font size one single time where I want and not on every click.

Answer 1

In short, I was able to get what I wanted:
Galactic_size.setSelection(0, true)
(Galactic_size.selectedView as TextView).setTextSize(TypedValue.COMPLEX_UNIT_PX, 500f)
But it turned out that the TextView is recreated with each selection, and therefore my original method is more correct.