CustomAdapterのpositionを画面遷移後に取得したい

CustomAdapterのpositionをSentDailyReportsListActivityからSentDailyReportsDetailActivityに遷移後に取得して、一覧で選択したものを詳細表示させたいですが、putExtraで渡せておらずnullになってしまいます。

kotlin
1package com.example.rworksample00026.ui.dailyreports
2
3import android.content.Intent
4import androidx.appcompat.app.AppCompatActivity
5import android.os.Bundle
6import android.util.Log
7import android.view.View
8import androidx.activity.viewModels
9import androidx.recyclerview.widget.DividerItemDecoration
10import androidx.recyclerview.widget.LinearLayoutManager
11import com.example.rworksample00026.databinding.ActivitySentDailyReportsListBinding
12import com.example.rworksample00026.model.entity.DailyReports
13import com.example.rworksample00026.ui.util.CustomAdapter
14
15class SentDailyReportsListActivity : AppCompatActivity() {
16
17    private lateinit var binding : ActivitySentDailyReportsListBinding
18    private val viewModel: DailyReportsViewModel by viewModels()
19    lateinit var mAdapter: CustomAdapter
20
21    override fun onCreate(savedInstanceState: Bundle?) {
22        super.onCreate(savedInstanceState)
23        binding = ActivitySentDailyReportsListBinding.inflate(layoutInflater)
24        setContentView(binding.root)
25
26        // RecyclerViewの取得
27        //https://hirauchi-genta.com/kotlin-recyclerview/
28        val recyclerView = binding.recyclerView
29
30        val dividerItemDecoration = DividerItemDecoration(this, LinearLayoutManager(this).orientation)
31        recyclerView.addItemDecoration(dividerItemDecoration)
32
33        // LayoutManagerの設定
34        recyclerView.layoutManager = LinearLayoutManager(this)
35
36        // CustomAdapterの生成と設定
37        mAdapter = CustomAdapter(viewModel.reportsData)
38
39        recyclerView.adapter = mAdapter
40
41        mAdapter.setOnItemClickListener(object : CustomAdapter.OnItemClickListener{
42            override fun onItemClickListener(view: View, position: Int, report: DailyReports) {
43                val intent = Intent(this@SentDailyReportsListActivity, SentDailyReportsDetailActivity::class.java)
44                intent.putExtra("position", position)
45                //Log.d("[position]", position.toString())
46                startActivity(intent)
47            }
48        })
49
50
51
52
53
54    }
55
56}

kotlin
1package com.example.rworksample00026.ui.util
2
3import android.view.LayoutInflater
4import android.view.View
5import android.view.ViewGroup
6import android.widget.TextView
7import androidx.recyclerview.widget.RecyclerView
8import com.example.rworksample00026.R
9import com.example.rworksample00026.databinding.ListBinding
10import com.example.rworksample00026.model.entity.DailyReports
11
12
13
14class CustomAdapter (private val dailyReportsList: List<DailyReports>): RecyclerView.Adapter<CustomAdapter.ViewHolder>() {
15
16    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
17        // create a new view
18        val view = LayoutInflater.from(parent.context).inflate(R.layout.list, parent, false)
19        //view.setOnClickListener(ItemClickListener())
20        return ViewHolder(view)
21    }
22
23    var point : Int = 0
24
25    // リスナー格納変数
26    lateinit var listener: OnItemClickListener
27
28    // インターフェースの作成
29    interface OnItemClickListener{
30        fun onItemClickListener(view: View, position: Int)
31    }
32
33    // リスナー
34    fun setOnItemClickListener( listener: OnItemClickListener){
35        this.listener = listener
36    }
37    /*
38    inner class ItemClickListener: View.OnClickListener{
39        override fun onClick(v: View) {
40            var context = v.context
41            val intent = Intent(context, SentDailyReportsDetailActivity::class.java)
42            intent.putExtra("point", point)
43            Log.d("[point]", point.toString())
44            context.startActivity(intent)
45        }
46    }
47    */
48
49    override fun onBindViewHolder(holder: CustomAdapter.ViewHolder, position: Int) {
50        /*
51        *   https://qiita.com/ngsw_taro/items/d29e3080d9fc8a38691e
52        *   withはletとは異なり拡張関数ではありません。
53        *   第一引数に任意の型Tを取ります。
54        *    第二引数に関数を取りますが、Tをレシーバとするメソッドである必要があります。
55        *
56         */
57        // タップしたとき
58        holder.itemView.setOnClickListener {
59            listener.onItemClickListener(it, position)
60        }
61
62        with(holder){
63            /*
64            *
65            *    positionは項目の位置
66            *   https://hirauchi-genta.com/kotlin-listview/
67             */
68
69
70            val reports = dailyReportsList[position]
71            //https://stackoverflow.com/questions/60491966/how-to-do-latest-jetpack-view-binding-in-adapter-bind-the-views/60492228
72            // AdapterでのViewBindingの使い方
73            binding.name.text = reports.title
74            binding.body.text = reports.impressions
75
76
77
78        }
79        //this.point = position
80
81    }
82
83    override fun getItemCount(): Int = dailyReportsList.size
84
85    class ViewHolder(view: View): RecyclerView.ViewHolder(view){
86        val binding = ListBinding.bind(view)
87        val name: TextView
88        val body: TextView
89
90
91
92        init {
93            name = binding.name
94            body = binding.body
95
96        }
97    }
98}

kotlin
1package com.example.rworksample00026.ui.dailyreports
2
3import android.content.Intent
4import android.os.Bundle
5import android.util.Log
6import android.view.View
7import androidx.activity.viewModels
8import com.example.rworksample00026.databinding.ActivitySentDailyReportsDetailBinding
9import com.example.rworksample00026.ui.util.ScopedAppActivity
10import kotlinx.coroutines.Dispatchers
11import kotlinx.coroutines.launch
12
13class SentDailyReportsDetailActivity : ScopedAppActivity() {
14
15    private lateinit var binding : ActivitySentDailyReportsDetailBinding
16    private val viewModel: DailyReportsViewModel by viewModels()
17
18
19    override fun onCreate(savedInstanceState: Bundle?) {
20        super.onCreate(savedInstanceState)
21        binding = ActivitySentDailyReportsDetailBinding.inflate(layoutInflater)
22        setContentView(binding.root)
23
24
25
26        val intent = getIntent()
27        val point = intent.getStringExtra("position")
28        Log.d("[position]", point)
29        val position = point.toInt()
30
31        // 非同期で入力値を表示(1件だけ)
32        launch (Dispatchers.IO){
33            val data = viewModel.reportsData
34
35            launch (Dispatchers.Main){
36                binding.title.setText(data.map { it.title }[position].toString())
37                binding.weeklyGoal.setText(data.map { it.weeklyGoal }[position].toString() )
38                binding.commutingTimeBefore.setText(data.map { it.commutingTimeBefore }[position].toString() )
39                binding.commutingTimeAfter.setText(data.map { it.commutingTimeAfter }[position].toString() )
40                binding.participationProgram.setText(data.map{it.participationProgram}[position].toString())
41                binding.detailsOfEfforts.setText(data.map{it.detailsOfEfforts}[position].toString())
42                binding.impressions.setText(data.map{it.impressions}[position].toString())
43                binding.meal.setText(data.map{it.meal}[position].toString())
44                binding.sleep.setText(data.map{it.sleep}[position].toString())
45                binding.motion.setText(data.map{it.motion}[position].toString())
46                binding.tirednessAndStress.setText(data.map{it.tirednessAndStress}[position].toString())
47                binding.remarks.setText(data.map{it.remarks}[position].toString())
48                binding.lookingBack.setText(data.map{it.lookingBack}[position].toString())
49                binding.nextWeekChallengeAndGoals.setText(data.map{it.nextWeeksChallengeAndGoals}[position].toString())
50            }
51        }
52
53        binding.Btn.setOnClickListener(object: View.OnClickListener{
54            override fun onClick(v: View?) {
55                val intent = Intent(this@SentDailyReportsDetailActivity, SentDailyReportsListActivity::class.java)
56                startActivity(intent)
57            }
58        })
59    }
60}