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RecyclerView doesn't appear in a Fragment

Why doesn't RecyclerView appear in my fragment? I've added recyclerview adapter in the fragment, but it still didn't appear. Here are the codes:
FollowersFragment.kt
class FollowersFragment : Fragment() {
private lateinit var binding: FragmentFollowersBinding
companion object {
private const val TAG = "FollowersFragment"
const val ARG_NAME = "userName"
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.fragment_followers, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding = FragmentFollowersBinding.inflate(layoutInflater)
val username = arguments?.getString(ARG_NAME)
val layoutManager = LinearLayoutManager(requireActivity())
binding.rvFollowers.layoutManager = layoutManager
val itemDecoration = DividerItemDecoration(requireActivity(), layoutManager.orientation)
binding.rvFollowers.addItemDecoration(itemDecoration)
val client = ApiConfig.getApiService().getFollowers(username.toString(),"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")
client.enqueue(object : Callback<List<FollowsResponseItem>> {
override fun onResponse(
call: Call<List<FollowsResponseItem>>,
response: Response<List<FollowsResponseItem>>
) {
if(response.isSuccessful){
val responseBody = response.body()
if(responseBody!=null){
Log.d(TAG,responseBody.toString())
setUserData(responseBody)
}else{
Log.e(TAG,"onFailure: ${response.message()}")
}
}
}
override fun onFailure(call: Call<List<FollowsResponseItem>>, t: Throwable) {
Log.e(TAG, "onFailure: ${t.message}")
}
})
}
fun setUserData(item: List<FollowsResponseItem>){
val listUser = ArrayList<UserResponse>()
val executor = Executors.newSingleThreadExecutor()
executor.execute {
try {
for (i in 0..item.size-1) {
if(item.size>5 && i>5){
break
}
val client = ApiConfig.getApiService()
.getUser(item.get(i).login, "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")
client.enqueue(object : Callback<UserResponse> {
override fun onResponse(
call: Call<UserResponse>,
response: Response<UserResponse>
) {
if (response.isSuccessful) {
val responseBody = response.body()
if (responseBody != null) {
listUser.add(responseBody)
if(i==4 || item.get(i).login.equals(item.get(item.size-1).login)){
Log.d(TAG,"user : $listUser")
val adapter = ListUserAdapter(listUser)
binding.rvFollowers.adapter = adapter
Log.d(TAG,adapter.toString())
adapter.setOnItemClickCallback(object: ListUserAdapter.OnItemClickCallback{
override fun onItemClicked(data: UserParcelable) {
showSelectedUser(data)
}
})
}
} else {
Log.e(TAG, "onFailure: ${response.message()}")
}
}
}
override fun onFailure(call: Call<UserResponse>, t: Throwable) {
Log.e(TAG, "onFailure: ${t.message}")
}
})
}
} catch(e: InterruptedException) {
e.printStackTrace()
}
}
}
private fun showSelectedUser(data: UserParcelable) {
}
}
DetailActivity.kt
class DetailActivity : AppCompatActivity() {
private lateinit var binding: ActivityDetailBinding
private var getUserName: String ="sidiqpermana"
companion object{
const val EXTRA_DATA = "extra_data"
#StringRes
private val TAB_TITLES = intArrayOf(
R.string.tab_text_1,
R.string.tab_text_2
)
}
#SuppressLint("SetTextI18n")
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
supportActionBar?.hide()
binding = ActivityDetailBinding.inflate(layoutInflater)
setContentView(binding.root)
val data = intent.getParcelableExtra<UserParcelable>(EXTRA_DATA) as UserParcelable
val sectionsPagerAdapter = SectionsPagerAdapter(this)
val viewPager: ViewPager2 = binding.viewPager
viewPager.adapter = sectionsPagerAdapter
val tabs: TabLayout = binding.tabs
sectionsPagerAdapter.userName = data.login
TabLayoutMediator(tabs,viewPager){ tab, position ->
tab.text = resources.getString(TAB_TITLES[position])
}.attach()
getUserName = data.login
showInfo(data)
}
fun getUserName() : String{
return getUserName
}
#SuppressLint("SetTextI18n")
private fun showInfo(data: UserParcelable){
Glide.with(this#DetailActivity)
.load(data.avatar_url)
.into(binding.detailPp)
if(data.name.equals("null")) binding.detailName.setText("No Name") else binding.detailName.setText(data.name)
binding.detailUsername.setText(data.login)
if(data.bio.equals("null")) binding.detailBio.setText("No Name") else binding.detailBio.setText(data.bio)
binding.detailFollowers.setText("${data.followers} Followers")
binding.detailFollowings.setText("${data.following} Following")
if(data.location.equals("null")) binding.detailLocation.setText("No Location") else binding.detailLocation.setText(data.location)
}
}
ListUserAdapter.kt (RecyclerView Adapter)
class ListUserAdapter (private val listUser: ArrayList<UserResponse>) : RecyclerView.Adapter<ListUserAdapter.ListViewHolder>() {
private lateinit var onItemClickCallback: OnItemClickCallback
fun setOnItemClickCallback(onItemClickCallback: OnItemClickCallback){
this.onItemClickCallback = onItemClickCallback
}
class ListViewHolder(var binding: ItemUsersRowBinding) : RecyclerView.ViewHolder(binding.root) {
}
override fun onCreateViewHolder(viewGroup: ViewGroup, viewType: Int): ListViewHolder {
val binding = ItemUsersRowBinding.inflate(LayoutInflater.from(viewGroup.context),viewGroup,false)
return ListViewHolder(binding)
}
#SuppressLint("SetTextI18n")
override fun onBindViewHolder(holder: ListViewHolder, position: Int) {
var (followers,avatar_url,following, name,bio, location, login) = listUser[position]
name = name ?: "No Name"
bio = bio ?: "No Bio"
location = location?: "No Location"
holder.apply {
Glide.with(itemView.getContext())
.load(avatar_url)
.into(binding.photoProfile)
binding.profileName.setText(name.toString())
binding.username.setText(login)
binding.followers.setText("$following Followers")
binding.followings.setText("$following Followings")
binding.location.setText(location.toString())
val detailUser = UserParcelable(followers,avatar_url,following,
name.toString(), bio.toString(), location.toString(), login)
itemView.setOnClickListener{ onItemClickCallback.onItemClicked(detailUser)}
}
}
override fun getItemCount(): Int {
return listUser.size
}
interface OnItemClickCallback {
fun onItemClicked(data: UserParcelable)
}
}
Help me solve this problem please.

There is no need to initialize adapter every time you want to update the list. Either make your ListUserAdapter extend ListAdapter and than use adapter.submitList(listUser) or if you want to extend RecyclerView.Adapter as you do, you can do the following :
class ListUserAdapter () : RecyclerView.Adapter<ListUserAdapter.ListViewHolder>() {
private val listUser: List<UserResponse>
fun submitList(newList: List<UserResponse>) {
listUser = newList
notifyDataSetChanged()
}
override fun onBindViewHolder(holder: ListViewHolder, position: Int) {
val listItem = listUser[position]
...
}
override fun getItemCount(): Int {
return listUser.size
}
}
I suggest you go with ListAdapter. Check if Log.d(TAG,"user : $listUser") is printed, if it is and listUser is not empty than call adapter.submitList(listUser) and RV should be populated.

You have missed to notify adapter about the changes, So after
binding.rvFollowers.adapter = adapter call adapter.notifyDataSetChanged()

firebase realtime database: messenger

I am building a chatting app using firebase realtime database.
I am storing the messages in both accounts simultaneously.
This is my fragment to send message:
class DmFragment : Fragment() {
lateinit var binding: FragmentDMBinding
lateinit var user: User
val list = ArrayList<Message>()
lateinit var auth: FirebaseAuth
lateinit var firebaseDatabase: FirebaseDatabase
lateinit var reference: DatabaseReference
lateinit var usersDMAdapter: UsersDMAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
user = it.getSerializable("user") as User
}
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentDMBinding.inflate(LayoutInflater.from(requireContext()), container, false)
auth = FirebaseAuth.getInstance()
val currentUser = auth.currentUser!!
firebaseDatabase = FirebaseDatabase.getInstance()
reference = firebaseDatabase.getReference("users")
binding.apply {
sendBtn.setOnClickListener {
val smsText = message.text.toString()
val simpleDateFormat = SimpleDateFormat("dd.MM.yyyy HH.ss")
val date = simpleDateFormat.format(Date())
val message1 = Message(smsText, date, currentUser.uid, user.uid)
val key = reference.push().key
reference.child("${currentUser.uid}/messages/${user.uid!!}/$key")
.setValue(message1)
reference.child("${user.uid}/messages/${currentUser.uid}/$key")
.setValue(message1)
message.text.clear()
}
reference.child("${currentUser.uid}/messages/${user.uid}")
.addValueEventListener(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
val children = snapshot.children
for (child in children) {
val value = child.getValue(Message::class.java)
if (value != null) {
list.add(value)
}
}
usersDMAdapter = UsersDMAdapter(list, currentUser.uid)
messageRv.adapter = usersDMAdapter
}
override fun onCancelled(error: DatabaseError) {
}
})
back.setOnClickListener {
findNavController().popBackStack()
}
userName.text = user.displayName
Picasso.get().load(user.photoUrl).into(userImage)
}
return binding.root
}
}
This is the adapter file that i used in the DMFragment:
class UsersDMAdapter(var list: List<Message>, var uid: String) :
RecyclerView.Adapter<RecyclerView.ViewHolder>() {
inner class FromVh(val fromBinding: ItemFromBinding) :
RecyclerView.ViewHolder(fromBinding.root) {
fun onBind(message: Message) {
fromBinding.apply {
messageTv.text = message.message
messageDateTv.text = message.date
}
}
}
inner class ToVh(val toBinding: ItemToBinding) :
RecyclerView.ViewHolder(toBinding.root) {
fun onBind(message: Message) {
toBinding.apply {
messageTv.text = message.message
messageDateTv.text = message.date
}
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
if (viewType == 1) {
return FromVh(
ItemFromBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
)
} else {
return ToVh(
ItemToBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
)
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
if (getItemViewType(position)==1){
val fromVh = holder as FromVh
fromVh.onBind(list[position])
}else{
val toVh = holder as ToVh
toVh.onBind(list[position])
}
}
override fun getItemViewType(position: Int): Int {
return if (list[position].fromUid == uid) {
1
} else{
2
}
}
override fun getItemCount(): Int = list.size
}
This is my fragment that shows all users excluding myself:
class UserRecyclerFragment : Fragment() {
lateinit var binding: FragmentUserRecyclerBinding
lateinit var userRvAdapter: UserRvAdapter
var list = ArrayList<User>()
lateinit var auth: FirebaseAuth
lateinit var firebaseDatabase: FirebaseDatabase
lateinit var reference: DatabaseReference
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentUserRecyclerBinding.inflate(
LayoutInflater.from(requireContext()),
container,
false
)
auth = FirebaseAuth.getInstance()
val currentUser = auth.currentUser!!
firebaseDatabase = FirebaseDatabase.getInstance()
reference = firebaseDatabase.getReference("users")
val email = currentUser.email
val displayName = currentUser.displayName
val photo = currentUser.photoUrl
val phoneNumber = currentUser.phoneNumber
val uid = currentUser.uid
val user = User(
email,
displayName,
photo.toString(),
phoneNumber,
uid
)
reference.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
list.clear()
val filterList = arrayListOf<User>()
val children = snapshot.children
for (child in children) {
val value = child.getValue(User::class.java)
if (value != null && uid != value.uid) {
list.add(value)
}
if (value != null && value.uid == uid) {
filterList.add(value)
}
}
if (filterList.isEmpty()) {
reference.child(uid).setValue(user)
}
userRvAdapter = UserRvAdapter(list, object : UserRvAdapter.OnItemClickListener {
override fun onItemCick(user: User) {
val bundle = Bundle()
bundle.putSerializable("user", user)
findNavController().navigate(R.id.dmFragment, bundle)
}
})
binding.rv.adapter = userRvAdapter
}
override fun onCancelled(error: DatabaseError) {
}
})
return binding.root
}
}
Whenever i chat (send/receive) in DM, it is showing messages. But when I go back, messages that added in my user account is being deleted automatically. If i come back again, it is not showing the messages that have been saved in other person's account either. And i do not know what to do. Can anyone help?

Paging 3 Library calls the load method recursively with LoadType.APPEND

I am trying to display data from IconFinder API. It seems to be ItemKeyedDataSource for me and I used Paging3 to display the data as it's mentioned in the official docs.
Here is code, please check if there're any issues with the implementation I have done and where is the mistake.
IconSetsRemoteMediator
#OptIn(ExperimentalPagingApi::class)
class IconSetsRemoteMediator(
private val query: String?,
private val database: IconsFinderDatabase,
private val networkService: IconFinderAPIService
) : RemoteMediator<Int, IconSetsEntry>() {
private val TAG: String? = IconSetsRemoteMediator::class.simpleName
private val iconSetsDao = database.iconSetsDao
private val remoteKeysDao = database.remoteKeysDao
override suspend fun initialize(): InitializeAction {
// Load fresh data when ever the app is open new
return InitializeAction.LAUNCH_INITIAL_REFRESH
}
override suspend fun load(
loadType: LoadType,
state: PagingState<Int, IconSetsEntry>
): MediatorResult {
val iconSetID = when (loadType) {
LoadType.REFRESH -> {
null
}
LoadType.PREPEND -> {
return MediatorResult.Success(
endOfPaginationReached = true
)
}
LoadType.APPEND -> {
Log.d(TAG, "LoadType.APPEND")
val lastItem = state.lastItemOrNull()
if (lastItem == null) {
return MediatorResult.Success(
endOfPaginationReached = true
)
}
// Get the last item from the icon-sets list and return its ID
lastItem.iconset_id
}
}
try {
// Suspending network load via Retrofit.
val response = networkService.getAllPublicIconSets(after = iconSetID)
val iconSets = response.iconsets
val endOfPaginationReached = iconSets == null || iconSets.isEmpty()
database.withTransaction {
if (loadType == LoadType.REFRESH) {
// Delete the data in the database
iconSetsDao.deleteAllIconSets()
//remoteKeysDao.deleteRemoteKeys()
}
Log.d(TAG, "iconSets = ${iconSets?.size}")
Log.d(TAG, "endOfPaginationReached = $endOfPaginationReached")
Log.d(TAG, "state.anchorPosition = ${state.anchorPosition}")
Log.d(TAG, "state.pages = ${state.pages.size}")
val time = System.currentTimeMillis()
/*val remoteKeys = iconSets!!.map {
RemoteKeysEntry(it.iconset_id, time)
}*/
// Insert new IconSets data into database, which invalidates the current PagingData,
// allowing Paging to present the updates in the DB.
val data = iconSets!!.mapAsIconSetsEntry()
iconSetsDao.insertAllIconSets(data)
// Insert the remote key values which set the time at which the data is
// getting updated in the DB
//remoteKeysDao.insertRemoteKeys(remoteKeys)
}
return MediatorResult.Success(endOfPaginationReached = endOfPaginationReached)
} catch (exception: IOException) {
return MediatorResult.Error(exception)
} catch (exception: HttpException) {
return MediatorResult.Error(exception)
}
}
}
IconFinderRepository
class IconFinderRepository(
private val service: IconFinderAPIService,
private val database: IconsFinderDatabase
) {
private val TAG: String? = IconFinderRepository::class.simpleName
fun getPublicIconSets(): Flow<PagingData<IconSetsEntry>> {
Log.d(TAG, "New Icon Sets query")
val pagingSourceFactory = { database.iconSetsDao.getIconSets() }
#OptIn(ExperimentalPagingApi::class)
return Pager(
config = PagingConfig(pageSize = NUMBER_OF_ITEMS_TO_FETCH, enablePlaceholders = false),
remoteMediator = IconSetsRemoteMediator(
query = null,
database,
service
),
pagingSourceFactory = pagingSourceFactory
).flow
}
companion object {
const val NUMBER_OF_ITEMS_TO_FETCH = 20
}
}
IconSetViewHolder
class IconSetViewHolder private constructor(val binding: RecyclerItemIconSetBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(iconSetsEntry: IconSetsEntry?) {
if (iconSetsEntry == null) {
//Show the Loading UI
} else {
binding.model = iconSetsEntry
binding.executePendingBindings()
}
}
companion object {
fun from(parent: ViewGroup): IconSetViewHolder {
val layoutInflater = LayoutInflater.from(parent.context)
val binding = RecyclerItemIconSetBinding.inflate(layoutInflater, parent, false)
return IconSetViewHolder(binding)
}
}
}
IconSetAdapter
class IconSetAdapter : PagingDataAdapter<UiModel.IconSetDataItem, ViewHolder>(UI_MODEL_COMPARATOR) {
companion object {
private val UI_MODEL_COMPARATOR =
object : DiffUtil.ItemCallback<UiModel.IconSetDataItem>() {
override fun areContentsTheSame(
oldItem: UiModel.IconSetDataItem,
newItem: UiModel.IconSetDataItem
): Boolean {
return oldItem.iconSetsEntry.iconset_id == newItem.iconSetsEntry.iconset_id
}
override fun areItemsTheSame(
oldItem: UiModel.IconSetDataItem,
newItem: UiModel.IconSetDataItem
): Boolean =
oldItem == newItem
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return if (viewType == R.layout.recycler_item_icon_set) {
IconSetViewHolder.from(parent)
} else {
IconSetViewHolder.from(parent)
}
}
override fun getItemViewType(position: Int): Int {
return when (getItem(position)) {
is UiModel.IconSetDataItem -> R.layout.recycler_item_icon_set
null -> throw UnsupportedOperationException("Unknown view")
else -> throw UnsupportedOperationException("Unknown view")
}
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val uiModel = getItem(position)
uiModel.let {
when (uiModel) {
is UiModel.IconSetDataItem -> (holder as IconSetViewHolder).bind(uiModel.iconSetsEntry)
}
}
}
}
HomeFragmentViewModel
class HomeFragmentViewModel(application: Application) : AndroidViewModel(application) {
private val TAG: String? = HomeFragmentViewModel::class.simpleName
private val repository: IconFinderRepository = IconFinderRepository(
IconFinderAPIService.create(),
IconsFinderDatabase.getInstance(application)
)
private var iconSetsQueryResult: Flow<PagingData<UiModel.IconSetDataItem>>? = null
fun iconSetsQuery(): Flow<PagingData<UiModel.IconSetDataItem>> {
val newResult: Flow<PagingData<UiModel.IconSetDataItem>> = repository.getPublicIconSets()
.map { pagingData -> pagingData.map { UiModel.IconSetDataItem(it) } }
.cachedIn(viewModelScope)
iconSetsQueryResult = newResult
return newResult
}
/**
* Factory for constructing HomeFragmentViewModel
*/
class Factory(private val application: Application) : ViewModelProvider.Factory {
override fun <T : ViewModel?> create(modelClass: Class<T>): T {
if (modelClass.isAssignableFrom(HomeFragmentViewModel::class.java)) {
return HomeFragmentViewModel(application) as T
}
throw IllegalArgumentException("Unable to construct ViewModel")
}
}
}
sealed class UiModel {
data class IconSetDataItem(val iconSetsEntry: IconSetsEntry) : UiModel()
}
IconSetFragment: This is one of the fragments implemented as part of ViewPager. Its parent is a Fragment in an Activity.
class IconSetFragment : Fragment() {
private val TAG: String = IconSetFragment::class.java.simpleName
/**
* Declaring the UI Components
*/
private lateinit var binding: FragmentIconSetBinding
private val viewModel: HomeFragmentViewModel by viewModels()
private val adapter = IconSetAdapter()
private var job: Job? = null
companion object {
fun newInstance(): IconSetFragment {
return IconSetFragment()
}
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Get a reference to the binding object
binding = DataBindingUtil.inflate(inflater, R.layout.fragment_icon_set, container, false)
Log.d(TAG, "onCreateView")
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
initAdapter()
job?.cancel()
job = viewLifecycleOwner.lifecycleScope.launch {
viewModel.iconSetsQuery().collectLatest {
adapter.submitData(it)
Log.d(TAG, "collectLatest $it")
}
}
}
private fun initAdapter() {
binding.rvIconSetList.adapter = adapter
/*.withLoadStateHeaderAndFooter(
header = LoadStateAdapter(), // { adapter.retry() },
footer = LoadStateAdapter { adapter.retry() }
)*/
}
}
IconSetsDao
#Dao
interface IconSetsDao {
#Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertAllIconSets(iconSets: List<IconSetsEntry>)
#Query("SELECT * FROM icon_sets_table")
fun getIconSets(): PagingSource<Int, IconSetsEntry>
#Query("DELETE FROM icon_sets_table")
suspend fun deleteAllIconSets()
}
This is the Logcat screenshot, the load() method is being invoked without any scrolling action.

I have the similar issue, seems the recursive loading issue is fixed by setting the recyclerView.setHasFixedSize(true)

LiveData doesn't triggered observing it from Fragment

I've a Fragment that observes a LiveData contained in a ViewModel to pass information in an RecyclerView.Adapter.
LiveData in the Fragment isn't triggered, but if I move it in an Activity, it's triggered.
Here's the code:
class ProfileViewModel : ViewModel() {
private val profileLiveData: MutableLiveData<User> = MutableLiveData(
private val followersPreview: LiveData<Query> =
Transformations.map(profileLiveData) { profile ->usersApi.getFollowers(profile.followers) }
private val followingPreview: LiveData<Query> =
Transformations.map(profileLiveData) { profile -> usersApi.getFollowing(profile.following) }
fun getProfile(userDocumentId: String): LiveData<User> {
usersApi.getProfile(userDocumentId)
.addSnapshotListener { querySnapshot, firebaseFirestoreException ->
if (firebaseFirestoreException != null) {
Log.d("Exception get profile", firebaseFirestoreException.message!!)
// Handle exception
}
val profileUser: User = querySnapshot?.toObject(User::class.java)!!
profileLiveData.value = profileUser
}
return profileLiveData
}
fun getProfileFollowers(): LiveData<Query> {
return followersPreview
}
}
class ListsProfileFragment : Fragment() {
private lateinit var fragmentListsBinding: FragmentListsProfileBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
fragmentListsBinding = FragmentListsProfileBinding.inflate(layoutInflater)
return fragmentListsBinding.root
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
val profileViewModel = ViewModelProviders.of(this).get(ProfileViewModel::class.java);
Log.d("Viewmodel", profileViewModel.toString())
profileViewModel
.getProfileFollowers()
.observe(viewLifecycleOwner,
Observer {
it.addSnapshotListener { querySnapshot, firebaseFirestoreException ->
val followers = mutableListOf<UserPreview>()
querySnapshot?.documents?.forEach { doc ->
val follower: UserPreview = UserPreview(
doc.get("username") as String,
doc.get("profileImage") as String
)
followers.add(follower)
}
fragmentListsBinding.recyclerViewFollowers.layoutManager =
LinearLayoutManager(this.activity, RecyclerView.HORIZONTAL, false)
fragmentListsBinding.recyclerViewFollowers.adapter =
AccountsAdapter(followers)
}
})
}
Could anyone help me? Thanks in advance.

Resolved using this code to load the ViewModel:
profileViewModel =
activity?.run { ViewModelProviders.of(this).get(ProfileViewModel::class.java) }
?: throw Exception("Invalid Activity")

search in a recyclerview

i have a fragment that have a recyclerview i'm trying to use setOnQueryTextListener to search some specific data and display the new data instead of the old one
this is my Fragmenttask.kt file
class Fragmenttask : Fragment(), SwipeRefreshLayout.OnRefreshListener {
private var mListener: OnFragmentInteractionListener? = null
private var mSwipeRefreshLayout: SwipeRefreshLayout? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
//container!!.removeAllViews()
setHasOptionsMenu(true)
val CustumViewtask = inflater!!.inflate(R.layout.fragment_fragmenttask, container, false)
val taskMainRV = CustumViewtask.findViewById(R.id.recyclerView_main) as RecyclerView
//taskMainRV.setBackgroundColor(Color.BLUE)
taskMainRV.layoutManager = LinearLayoutManager(context)
//recyclerView_main.adapter = MainAdapter()
fetchJson(taskMainRV)
return CustumViewtask
}
override fun onRefresh() {
Toast.makeText(context, "تم التحميل بنجاح والحمد لله", Toast.LENGTH_LONG).show()
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
inflater.inflate(R.menu.menu_user, menu)
val searchItem = menu.findItem(R.id.action_search)
val searchView = MenuItemCompat.getActionView(searchItem) as SearchView
searchView.queryHint = "أكتب كلمة بحث ..."
searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener {
override fun onQueryTextChange(q: String): Boolean {
println("my serch : $q")
//fetchJson(taskMainRV)
//adaptertask?.notifyDataSetChanged()
//notifyDataSetChanged
println("mohamed 78797987897987987987987987987987987987897")
return false
}
override fun onQueryTextSubmit(q: String): Boolean {
println("my serch : $q")
println("mohamed 78797987897987987987987987987987987987897**************")
return false
}
})
//searchView.setOnQueryTextListener(this)
//https://stackoverflow.com/questions/30398247/how-to-filter-a-recyclerview-with-a-searchview?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
}
fun onQueryTextChange(query: String): Boolean {
// Here is where we are going to implement the filter logic
return false
}
fun onQueryTextSubmit(query: String): Boolean {
return false
}
fun fetchJson(RSV: RecyclerView) {
//SharedPreferences
val MY_APP_INFO: String = "UserInfo"
val prefs = activity.getSharedPreferences(MY_APP_INFO, AppCompatActivity.MODE_PRIVATE)
val LoggedUserId = prefs.getString("UserId", null)
var serchqury = arguments.getString("serchqury")
if(serchqury.isNullOrEmpty()){
serchqury = ""
}
println(serchqury+" ------------**/*/*/*/*/*/*/*/*/*/ ")
println("your code is : $LoggedUserId")
println("Attempting to Fetch JSON")
val url = "http://www.deraah-rs.com/1mahamatonline/html/Restful/get_tasks.php"
val client = OkHttpClient()
val formBody = FormBody.Builder().add("UserId", LoggedUserId)
.add("serchqury", serchqury).build()
val request = Request.Builder().url(url)
.post(formBody)
.build()
client.newCall(request).enqueue(object: Callback {
override fun onResponse(call: Call?, response: Response?) {
val body = response?.body()?.string()
println("mohamed : $body")
val gson = GsonBuilder().create()
val tasksfeed = gson.fromJson(body, M_tasksFeed::class.java)
activity.runOnUiThread {
RSV.adapter = MainAdaptertasks(tasksfeed)
if(taskfragmentprogressbar != null){
taskfragmentprogressbar.visibility = View.INVISIBLE
}
//ChatAdapter(Context, tasksfeed)
}
}
override fun onFailure(call: Call?, e: IOException?) {
println("Failed to execute request")
}
})
}
// TODO: Rename method, update argument and hook method into UI event
fun onButtonPressed(uri: Uri) {
if (mListener != null) {
mListener!!.onFragmentInteraction(uri)
}
}
companion object {
fun newInstance(): Fragmenttask {
val fragment = Fragmenttask()
val args = Bundle()
fragment.arguments = args
return fragment
}
}
}// Required empty public constructor
......................................................................................................................................