Kotlin Fragment: notifyDataSetChanged() in Fragment not working

I'm creating an app that lets you track some League data from their api. I'm sending data to a Firestore database and pulling it to fill a RecyclerView. I'm having trouble using notifyDataSetChanged on my RecyclerView when I add or remove data to be tracked. When I swap to another fragment and back, it works, but I want it to update while you're still in the same fragment. Any help would be greatly appreciated!

Data Model:

@Parcelize  data class Summoner (val summonerID: String, /* Doc ID is actually summ id */                       val name: String,                       val pictureURL: String,                       val region: String) : Parcelable {        companion object {          fun DocumentSnapshot.toSummoner() : Summoner? {              return try {                  val name = getString("name")!!                  val pictureURL = getString("icon")!!                  val region = getString("region")!!                  Summoner(id, name, pictureURL, region)              } catch (e: Exception) {                  Log.e(TAG, "Error converting user profile", e)                          FirebaseCrashlytics.getInstance().log("Error converting user profile")                          FirebaseCrashlytics.getInstance().setCustomKey("userId", id)                          FirebaseCrashlytics.getInstance().recordException(e)                  null              }          }          private const val TAG = "Summoner"      }  }  

RecyclerView

class SummonerListAdapter : ListAdapter<Summoner, SummonerListAdapter.SummonerViewHolder>(SummonerComparator()) {        class SummonerComparator: DiffUtil.ItemCallback<Summoner>() {          override fun areItemsTheSame(oldItem: Summoner, newItem: Summoner): Boolean {              return oldItem === newItem          }            override fun areContentsTheSame(oldItem: Summoner, newItem: Summoner): Boolean {              return oldItem.name == newItem.name          }        }      class SummonerViewHolder(private val view : View) : RecyclerView.ViewHolder(view) {          val textViewName : TextView = view.findViewById(R.id.textView_followedSummName)          val textViewRegion : TextView = view.findViewById(R.id.textView_followedSummRegion)          val imageViewSumm : ImageView = view.findViewById(R.id.imageView_followedSumm)            fun bindText(text : String?, textView: TextView) {              textView.text = text          }            companion object {              fun create (parent: ViewGroup) : SummonerViewHolder {                  val view = LayoutInflater.from(parent.context).inflate(R.layout.item_summoner, parent, false)                  return SummonerViewHolder(view)              }          }      }        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SummonerViewHolder {          return SummonerViewHolder.create(parent)      }        override fun onBindViewHolder(holder: SummonerViewHolder, position: Int) {          val currentSummoner = getItem(position)          holder.bindText(currentSummoner.name, holder.textViewName)          holder.bindText(currentSummoner.region, holder.textViewRegion)          Picasso.get().load(currentSummoner.pictureURL).into(holder.imageViewSumm)      }        override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {          super.onAttachedToRecyclerView(recyclerView)          Log.e(TAG, "attached")      }    }  

ViewModel

class FollowedViewModel : ViewModel() {        private val _summonerProfile = MutableLiveData<Summoner>()      val summonerProfile : LiveData<Summoner> = _summonerProfile      private val _followedSumms = MutableLiveData<List<Summoner>>()      val followedSumms: LiveData<List<Summoner>> = _followedSumms      init {          viewModelScope.launch {              _summonerProfile.value = FirebaseProfileService.getProfileData(summonerId = "")              _followedSumms.value = FirebaseProfileService.getFollowedSumms(userId = "")              Log.e("Followed Summs", followedSumms.toString())            }      }  }  

Fragment Observer:

val adapter = SummonerListAdapter()          val viewModel = ViewModelProvider(this)[FollowedViewModel::class.java]          recyclerView = view.findViewById(R.id.recyclerView_followed)          recyclerView.adapter = adapter          recyclerView.layoutManager = LinearLayoutManager(context)          Log.e("0", summonerList.toString())          viewModel.followedSumms.observe(viewLifecycleOwner, Observer {              adapter.submitList(it)          })  

https://stackoverflow.com/questions/67363066/kotlin-fragment-notifydatasetchanged-in-fragment-not-working May 03, 2021 at 11:06AM