파이어베이스 리얼타임 데이터베이스 불러오기 - 질문

질문 : 파이어베이스 리얼타임 데이터베이스에 날짜와 메모가 입력이 잘되었는데 어플 창에는 날짜가 뜨지 않습니다.

-adapter_list.notifyDataSetChanged()하기 전까지는 날짜가 잘 떳는데 그 다음부턴 날짜가 파이어베이스에만 입력되고 어플 창에는 뜨지 않습니다 ㅜㅜ

왜이런걸까요?

-파이어베이스 리얼타임 데이터베이스에 입력이 잘됨

문제 화면: 어플 화면에 날짜가 안뜸

-MainActivity.kt 코드입니다

package com.ipari.diet_memo

import android.app.DatePickerDialog
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.widget.*
import androidx.appcompat.app.AlertDialog
import com.google.firebase.auth.ktx.auth
import com.google.firebase.database.DataSnapshot
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.ValueEventListener
import com.google.firebase.database.ktx.database
import com.google.firebase.ktx.Firebase
import java.util.*

class MainActivity : AppCompatActivity() {

    val dataModelList = mutableListOf<DataModel>()

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val database = Firebase.database
        val myRef = database.getReference("myMemo")

        val listView = findViewById<ListView>(R.id.mainLV)
        val adapter_list = ListViewAdapter(dataModelList)

        listView.adapter= adapter_list

        Log.d("DataModel------", dataModelList.toString())

        myRef.child(Firebase.auth.currentUser!!.uid).addValueEventListener(object : ValueEventListener{
            override fun onDataChange(snapshot: DataSnapshot) {
                dataModelList.clear()

                for (dataModel in snapshot.children) {
                    Log.d("Data", dataModel.toString())
                    dataModelList.add(dataModel.getValue(DataModel::class.java)!!)
                }
                adapter_list.notifyDataSetChanged()
                Log.d("DataModel", dataModelList.toString())
            }

            override fun onCancelled(error: DatabaseError) {

            }

        })

        val writeButton = findViewById<ImageView>(R.id.writeBtn)
        writeButton.setOnClickListener {

            val mDialogView = LayoutInflater.from(this).inflate(R.layout.custom_dialog, null)
            val mBuilder = AlertDialog.Builder(this)
                .setView(mDialogView)
                .setTitle("운동 메모 다이얼로그")

            val mAlertDialog = mBuilder.show()
            val DateSelectBtn = mAlertDialog.findViewById<Button>(R.id.dataSelectBtn)

            var dateText=""

            DateSelectBtn?.setOnClickListener {
                val today = GregorianCalendar()
                val year : Int = today.get(Calendar.YEAR)
                val month : Int = today.get(Calendar.MONTH)
                val date : Int = today.get(Calendar.DATE)

                val dlg = DatePickerDialog(this, object : DatePickerDialog.OnDateSetListener{
                    override fun onDateSet(view: DatePicker?, year: Int, month: Int, dayOfMonth: Int
                    ) {
                        Log.d("MAIN", "${year}, ${month +1}, ${dayOfMonth}")
                        DateSelectBtn.setText("${year}, ${month +1}, ${dayOfMonth}")

                        dateText = "${year}, ${month +1}, ${dayOfMonth}"
                    }
                }, year, month, date)
                dlg.show()

            }

            val saveBtn = mAlertDialog.findViewById<Button>(R.id.saveBtn)
            saveBtn?.setOnClickListener {

                val healthMemo = mAlertDialog.findViewById<EditText>(R.id.healthMemo)?.text.toString()
                val database = Firebase.database
                val myRef = database.getReference("myMemo").child(Firebase.auth.currentUser!!.uid)

                val model = DataModel(dateText, healthMemo)

                myRef
                    .push()
                    .setValue(model)
                mAlertDialog.dismiss()
            }

        }
    }
}