[Android,Kotiln] TapLayout이 다시 클릭됬을때 앱이 죽는 문제 해결.

package com.android.maplemate

import android.content.Context
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.datastore.core.DataStore
import androidx.datastore.preferences.core.Preferences
import androidx.datastore.preferences.preferencesDataStore
import androidx.viewpager2.widget.ViewPager2
import com.android.maplemate.Adapter.ViewPager2Adapter
import com.android.maplemate.databinding.ActivityMainBinding
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator



class MainActivity : AppCompatActivity() {

    private val binding by lazy { ActivityMainBinding.inflate(layoutInflater) }
    private val viewPagerAdapter by lazy { ViewPager2Adapter(this) }
    //datastore 객체를 불러옴
    private val Context.dataStore: DataStore<Preferences> by preferencesDataStore( name = "getocid" )

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val view = binding.root
        setContentView(view)

        viewPager2State()
        setupTabIcons()

        TabLayoutMediator(
            binding.tabLayout,
            binding.viewPager2
        ) { tab, position ->
            tab.setText(viewPagerAdapter.getTitme(position))
            tab.setIcon(viewPagerAdapter.getIcon(position))
        }.attach()

        pageChangeCallBack()
        binding.viewPager2.offscreenPageLimit = viewPagerAdapter.itemCount

    }

    private fun viewPager2State() {
        binding.viewPager2.apply {
            adapter = viewPagerAdapter
            setCurrentItem(
                viewPagerAdapter.findFragmentTabIndex(R.string.member_second),
                false
            )
            setUserInputEnabled(true) //  viewpager 의 슬라이드를 담당하는 메서드
        }
    }

    private fun pageChangeCallBack() {
        binding.viewPager2.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
            var currentState = 0
            var currentPosition = 0

            override fun onPageScrolled(
                position: Int,
                positionOffset: Float,
                positionOffsetPixels: Int
            ) {
                if (currentState == ViewPager2.SCROLL_STATE_DRAGGING && currentPosition == position) {
                    if (currentPosition == 0) binding.viewPager2.currentItem = 4
                    else if (currentPosition == 4) binding.viewPager2.currentItem = 0
                }
                super.onPageScrolled(position, positionOffset, positionOffsetPixels)
            }

            override fun onPageSelected(position: Int) {
                currentPosition = position
                super.onPageSelected(position)
            }

            override fun onPageScrollStateChanged(state: Int) {
                currentState = state
                super.onPageScrollStateChanged(state)
            }
        })
    }

    /**
     * 작성자:윤동현
     * 내용: 홈 탭에서 다른 탭으로 이동시 사용
     * ViewPagerAdapter에서 Tab 이름을 검색하여 나온
     * index값을 가져와 Tab 현재위치를 바꿔줌
     * */
    fun moveTabFragment(title: Int) {
        val index = viewPagerAdapter.findFragmentTabIndex(title)
        binding.viewPager2.setCurrentItem(index, false)
    }

    private fun setupTabIcons() {
        binding.tabLayout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
            override fun onTabSelected(tab: TabLayout.Tab?) {
                val icon = when (tab?.position) {
                    0 -> R.drawable.budget
                    1 -> R.drawable.community
                    2 -> R.drawable.home
                    3 -> R.drawable.scrap
                    4 -> R.drawable.mypage
                    else -> R.drawable.basic
                }
                tab?.setIcon(icon)
            }

            override fun onTabUnselected(tab: TabLayout.Tab?) {
                
                val icon = when (tab?.position) {
                    0 -> R.drawable.budget
                    1 -> R.drawable.community
                    2 -> R.drawable.home
                    3 -> R.drawable.scrap
                    4 -> R.drawable.mypage
                    else -> R.drawable.basic
                }
                tab?.setIcon(icon)
            }

            override fun onTabReselected(tab: TabLayout.Tab?) {
                val icon = when (tab?.position) {
                    0 -> R.drawable.budget
                    1 -> R.drawable.community
                    2 -> R.drawable.home
                    3 -> R.drawable.scrap
                    4 -> R.drawable.mypage
                    else -> R.drawable.basic
                }
                 tab?.setIcon(icon)
            }
        })
    }
}

제일 아래에 위치한 함수를 보면 onTabReselected 라는 함수가 있는데,
이걸 처리를 안해놔서 뭔가 대단한 버그라고 생각해서 여태 방치했다가, 팀원 합류로
불편할것같아서 눈 크게 뜨고 찾아보다가 발견했다.
여기에 아무 처리가 되어있지않고 비어있게 된다면 앱은 두번 클릭했을때의 이벤트를 처리하지 못하고 죽게된다.