spinnerのアイテムをクリックしても反応しない

Question

##　実現したいこと
android studioでspinnerをつかって項目を選択，選択された項目をマテリアルデザインのTextfieldにsetTextしたいと考えています．

発生している問題

spinnerにsetOnItemSelectedListenerを設定しましたが，クリック時に特に反応がありませんでした．Logもでないためクリック時の処理ができていないのだと思います．どなたか原因のわかる方よろしくお願いいたします．

コード

元のコードが長かったため，明らかに関係がない箇所は省きました．

package com.example.appdoonelist

import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.*
import android.widget.AdapterView.OnItemLongClickListener
import androidx.fragment.app.Fragment
import androidx.lifecycle.ViewModelProviders
import androidx.navigation.fragment.findNavController
import com.google.android.material.datepicker.MaterialDatePicker
import com.google.android.material.dialog.MaterialAlertDialogBuilder
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.android.material.textfield.TextInputEditText
import java.text.SimpleDateFormat
import java.util.*


class DoneSecondFragment  : Fragment() {

    private val menuItems = mutableListOf<String>()

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {

        val view = inflater.inflate(R.layout.fragment_done_second, container, false)


        val commentView = view.findViewById<TextInputEditText>(R.id.commentcontainer)
        val dateView = view.findViewById<TextInputEditText>(R.id.datecontainer)
        val categoryView = view.findViewById<TextInputEditText>(R.id.categorycontainer)

        val viewModel: viewModel? = activity?.let { ViewModelProviders.of(it).get(viewModel::class.java) }
        if (viewModel?.sameActivity == 0) {
            commentView.setText(viewModel.comment)
            dateView.setText((viewModel.date))
            categoryView.setText((viewModel.category))

        }


//        カテゴリメニュー

//質問該当箇所＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊
        val categorySpinner = view?.findViewById<Spinner>(R.id.categorymenu)
        val adapter = ArrayAdapter(requireContext(), R.layout.custom_spinner_item, menuItems)
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
        categorySpinner?.adapter = adapter


        val categoryContainer = view?.findViewById<TextInputEditText>(R.id.categorycontainer)

        categorySpinner?.onItemSelectedListener = object :AdapterView.OnItemSelectedListener{
            override fun onItemSelected(parent: AdapterView<*>?, view: View, position: Int, id: Long) {
                Log.e("select","success!!!")
                val selectedItem = categorySpinner?.selectedItem as String
                categoryContainer?.setText(selectedItem)
            }

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

//＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊

//        ダイアログ
        val fab = view.findViewById<FloatingActionButton>(R.id.floatingAddButton)
        fab.setOnClickListener(NewCategoryListener())

        return view
    }

   

    private inner class NewCategoryListener : View.OnClickListener {
        val editText = EditText(context)

        override fun onClick(v: View?) {
//            Edittextを二回目にセットするときのためにremoveしている．（二回addボタンを押したとき）
            if (editText.parent != null) {
                val parent = editText.parent as ViewGroup
                parent.removeView(editText)
            }

            MaterialAlertDialogBuilder(requireContext())
                    .setTitle(resources.getString(R.string.dialog_message))
                    .setView(editText)
                    .setNegativeButton(resources.getString(R.string.Cancel)) { dialog, which -> }
                    .setPositiveButton(resources.getString(R.string.OK)) { dialog, which ->

                        val _helperCategory = activity?.let { CategoryDataHelper(it) }
                        val db = _helperCategory?.writableDatabase

                        val sqlInsert = "INSERT INTO categorylist(categoryitem) VALUES (?)"
                        val stmt = db?.compileStatement(sqlInsert)
                        stmt?.bindString(1, editText.text.toString())
                        stmt?.executeInsert()

                        CategoryCreate()
                    }

                    .show()

        }

    }



    private fun CategoryCreate(){

        menuItems.clear()
        val _helperCategory = activity?.let { CategoryDataHelper(it) }
        val db = _helperCategory?.writableDatabase
        val sql = "SELECT * FROM categorylist"
        val cursor = db?.rawQuery(sql, null)
        if(cursor != null){
            while (cursor.moveToNext()){
                val index = cursor.getColumnIndex("categoryitem")
                val categoryItem = cursor.getString(index)
                menuItems.add(categoryItem)
            }
        }
    }

Answer 1

menuItems の内容を変更した場合、adapter の notifyDataSetChanged メソッドを呼ぶ必要があります。

        CategoryCreate()
        adapter.notifyDataSetChanged()