인프런 커뮤니티 질문&답변

storage에 업로드하는 강의까지 아무 오류없이 로그인도 잘되고 잘됐습니다.

근데 이번 강의를 모두 작성한 후 로그인시 화면이 튕깁니다.

코드에 오류는 전혀 없고 3일동안 프로젝트랑 파이어베이스랑 전부 다 5번 지우고 다시 똑같이 따라써서 한글자도 하나의 설정도 틀린 것이 없습니다. 또한 하울님의 github 코드를 복붙해도 완전히 똑같은 오류가 납니다. Migrate to AndroidX , clean, rebuild, restart 백번했습니다. 

MainActivity.kt에 Oncreate에서 상세화면 페이지를 부르는 이 코드를 지우면 로그인을 해도 화면이 튕기지 않습니다.

bottom_navigation.selectedItemId = R.id.action_home

Run 창에 

E/AndroidRuntime: FATAL EXCEPTION: grpc-default-executor-0

    Process: com.example.jbstagram_try1, PID: 30258

    java.lang.AssertionError

        at io.grpc.internal.DnsNameResolver.getResourceResolver(DnsNameResolver.java:536)

        at io.grpc.internal.DnsNameResolver.access$500(DnsNameResolver.java:60)

        at io.grpc.internal.DnsNameResolver$1.run(DnsNameResolver.java:211)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)

        at java.lang.Thread.run(Thread.java:764)

이 오류가 뜨면서 로그인시 메인화면이 뜨자마자 튕기며

제 DetailViewFragment.kt의 코드는 이렇습니다.

package com.example.jbstagram_try1.navigation

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.jbstagram_try1.R
import com.example.jbstagram_try1.navigation.model.ContentDTO
import com.google.firebase.firestore.FirebaseFirestore
import kotlinx.android.synthetic.main.item_detail.view.*
import kotlinx.android.synthetic.main.fragment_detail.view.*
//
class DetailViewFragment : Fragment(){
    var firestore : FirebaseFirestore? = null
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        var view = LayoutInflater.from(activity).inflate(R.layout.fragment_detail,container,false)
        firestore = FirebaseFirestore.getInstance()

        view.detailviewfragment_recyclerview.adapter = DetailViewRecyclerViewAdapter()
        view.detailviewfragment_recyclerview.layoutManager = LinearLayoutManager(activity)
        return view
    }
    inner class DetailViewRecyclerViewAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>(){
        var contentDTOs : ArrayList<ContentDTO> = arrayListOf()
        var contentUidList : ArrayList<String> = arrayListOf()

        init {

            firestore?.collection("images")?.orderBy("timestamp")?.addSnapshotListener { querySnapshot, firebaseFirestoreException ->
                contentDTOs.clear()
                contentUidList.clear()
                for (snapshot in querySnapshot!!.documents){
                    var item = snapshot.toObject(ContentDTO::class.java)
                    contentDTOs.add(item!!)
                    contentUidList.add(snapshot.id)
                }
                notifyDataSetChanged()
            }
        }

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
            var view = LayoutInflater.from(parent.context).inflate(R.layout.item_detail,parent,false)
            return CustomViewHolder(view)
        }

        inner class CustomViewHolder(view: View) : RecyclerView.ViewHolder(view) {

        }

        override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
            var viewholder = (holder as CustomViewHolder).itemView
            viewholder.detailviewitem_profile_textview.text = contentDTOs!![position].userId
            Glide.with(holder.itemView.context).load(contentDTOs!![position].imageUrl).into(viewholder.detailviewitem_imageview_content)

            viewholder.detailviewitem_explain_textview.text = contentDTOs!![position].explain

            viewholder.detailviewitem_favoritecounter_textview.text = "Likes" + contentDTOs!![position].favoriteCount

            Glide.with(holder.itemView.context).load(contentDTOs!![position].imageUrl).into(viewholder.detailviewitem_profile_image)

        }

        override fun getItemCount(): Int {
            return contentDTOs.size
        }

    }
}

이건 MainActivity.kt 코드입니다.

package com.example.jbstagram_try1

import android.content.Intent
import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.example.jbstagram_try1.navigation.*
import com.example.jbstagram_try1.R
import com.example.jbstagram_try1.navigation.*
import com.google.android.material.bottomnavigation.BottomNavigationView
import kotlinx.android.synthetic.main.activity_main.*
import java.util.jar.Manifest

class MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemSelectedListener {
    override fun onNavigationItemSelected(p0: MenuItem): Boolean {
        when (p0.itemId) {
            R.id.action_home -> {
                var detailViewFragment = DetailViewFragment()
                supportFragmentManager.beginTransaction()
                    .replace(R.id.main_content, detailViewFragment).commit()
                return true
            }
            R.id.action_search -> {
                var gridFragment = GridFragment()
                supportFragmentManager.beginTransaction().replace(R.id.main_content, gridFragment)
                    .commit()
                return true
            }
            R.id.action_add_photo -> {

                if (ContextCompat.checkSelfPermission(
                        this,
                        android.Manifest.permission.READ_EXTERNAL_STORAGE
                    ) == PackageManager.PERMISSION_GRANTED
                ) {
                    startActivity(Intent(this, AddPhotoActivity::class.java))
                }
                return true
            }
            R.id.action_favorite_alarm -> {
                var alarmFragment = AlarmFragment()
                supportFragmentManager.beginTransaction().replace(R.id.main_content, alarmFragment)
                    .commit()
                return true
            }
            R.id.action_account -> {
                var userFragment = UserFragment()
                supportFragmentManager.beginTransaction().replace(R.id.main_content, userFragment)
                    .commit()
                return true
            }
        }
        return false
    }


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        bottom_navigation.setOnNavigationItemSelectedListener(this)
        ActivityCompat.requestPermissions(this, arrayOf(android.Manifest.permission.READ_EXTERNAL_STORAGE), 1)

        bottom_navigation.selectedItemId = R.id.action_home
    }
}