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Room livedata , databinding issue : UI doesn't update when data changes

I am now developing an application where I use MVVM pattern for UI and repository interaction. In other words, I receive live data object with a list of models from my ROOM data base query via repository, then assign it to my live data variable in viewmodel. After that, this data should be populated to my xml layout recycler view via data binding, but It happens only once fragment is initialised. In other cases recycler view is void
DAO code :
#Query("SELECT * FROM note WHERE content LIKE :query ORDER BY isStarred")
fun searchAllNotes(query : String?) : Flow<List<Note>>
ViewModel code:
#HiltViewModel
class HomeViewModel #Inject constructor (
private val noteRepository : NoteRepository
) : ViewModel() {
private var _notesLiveData : LiveData<List<Note>> = noteRepository.getAllNotes().asLiveData()
val notesLiveData get()= _notesLiveData
fun searchNotes(query : String){
viewModelScope.launch(Dispatchers.IO){
_notesLiveData = noteRepository.searchAllNotes(query).asLiveData()
}
}
fun deleteNote(note : Note){
viewModelScope.launch(Dispatchers.IO){
noteRepository.deleteNote(note)
}
}
fun updateNoteChecked(note : Note){
viewModelScope.launch(Dispatchers.IO){
noteRepository.updateNoteChecked(note.id, note.isStarred)
}
}
Fragment code
#AndroidEntryPoint
class HomeFragment : Fragment(),
NoteCardAdapter.NoteTouchListener,
SearchView.OnQueryTextListener{
private var _binding : FragmentHomeBinding? = null
val binding get() = _binding!!
private val adapter by lazy {
NoteCardAdapter(this as NoteCardAdapter.NoteTouchListener)
}
private val vm : HomeViewModel by viewModels()
private val noteSharedViewModel : NoteSharedViewModel by activityViewModels()
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
_binding = FragmentHomeBinding.inflate(inflater)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
binding.adapter = adapter
binding.vm = vm
binding.apply {
lifecycleOwner = viewLifecycleOwner
homeRecyclerView.isNestedScrollingEnabled = false
homeRecyclerView.layoutManager = LinearLayoutManager(view.context)
homeRecyclerView.itemAnimator= NotesItemAnimator()
}
binding.homeSearchView.isSubmitButtonEnabled = true
binding.homeSearchView.setOnQueryTextListener(this as SearchView.OnQueryTextListener)
binding.addNoteButton.setOnClickListener{
val note = Note(
"","","",false, activity?.getDate(), folderId = -1
)
noteSharedViewModel.selectNote(note)
val action = HomeFragmentDirections.actionHomeFragmentToSingleNoteFragment(
isNew = true
)
findNavController().navigate(action)
}
binding.foldersButton.setOnClickListener{
findNavController().navigate(HomeFragmentDirections.actionHomeFragmentToFoldersFragment())
}
}
xml layout code :
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
>
<data>
<variable
name="vm"
type="com.example.leonidsnotesapplication.presentation.notes_feature.viewmodels.HomeViewModel" />
<variable
name="adapter"
type="com.example.leonidsnotesapplication.presentation.notes_feature.adapters.NoteCardAdapter" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:background="#color/note_background_color_3"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".presentation.notes_feature.fragments.HomeFragment">
<androidx.appcompat.widget.SearchView
android:id="#+id/homeSearchView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:theme="#style/AppSearchView"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<TextView
android:id="#+id/tvRecentTitle"
android:textStyle="bold"
android:textSize="25sp"
android:textColor="#color/button_color_2"
android:text="#string/recent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginStart="20dp"
app:layout_constraintTop_toBottomOf="#id/homeSearchView"
app:layout_constraintStart_toStartOf="parent"/>
<ImageView
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_marginStart="16dp"
android:layout_marginTop="28dp"
android:background="#drawable/ic_circle_arrow"
app:layout_constraintStart_toEndOf="#id/tvRecentTitle"
app:layout_constraintTop_toBottomOf="#id/homeSearchView" />
<androidx.recyclerview.widget.RecyclerView
tools:listitem="#layout/note_card_view"
android:scrollbars="vertical"
android:scrollbarStyle="outsideInset"
android:id="#+id/homeRecyclerView"
android:layout_width="match_parent"
android:requiresFadingEdge="vertical"
android:fadingEdge="vertical"
android:fadingEdgeLength="15dp"
android:layout_height="500dp"
android:layout_marginTop="30dp"
app:setNoteAdapter="#{adapter}"
app:submitNoteList="#{vm.notesLiveData}"
app:layout_constraintTop_toBottomOf="#id/tvRecentTitle"
app:layout_constraintStart_toStartOf="parent"
/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:backgroundTint="#color/button_color_1"
android:id="#+id/add_note_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:src="#drawable/ic_create"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:backgroundTint="#color/button_color_1"
android:id="#+id/folders_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:src="#drawable/ic_folders_stack"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
Data binding adapter :
#BindingAdapter("submitNoteList")
fun submitNoteList(recyclerView: RecyclerView, data : List<Note>?){
val adapter = recyclerView.adapter as NoteCardAdapter
adapter.setData((data as ArrayList<Note>? ?: arrayListOf()))
}
#BindingAdapter("setNoteAdapter")
fun setNoteAdapter(recyclerView: RecyclerView, adapter: NoteCardAdapter){
adapter.let {
recyclerView.adapter = it
}
}

You should observe your live data. Example code is:
vm.notesLiveData.observe(viewLifecycleOwner) { adapter.submitList(it) }

Android - Failed to load data using data binding and retrofit

I'm trying to make simple app to show list of cocktails using data binding and retrofit. I can see by logging interceptor request is 200 but when i debug i can see the result list is null.debug screenshot
responce screenshot
Fragment class
class CocktailListFragment : Fragment() {
private val viewModel: CocktailListViewModel by lazy {
ViewModelProvider(this).get(CocktailListViewModel::class.java)
}
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View {
val binding = CocktailListFragmentBinding.inflate(inflater)
binding.lifecycleOwner = this
setHasOptionsMenu(true)
binding.cocktail = viewModel
binding.cocktailList.adapter = CocktailListAdapter()
return binding.root
}
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
inflater.inflate(R.menu.filter_menu, menu)
super.onCreateOptionsMenu(menu, inflater)
}
}
ViewModel
class CocktailListViewModel : ViewModel() {
private val _cocktails = MutableLiveData<CocktailsList>()
val cocktails: LiveData<CocktailsList>
get() = _cocktails
private var viewModelJob = Job()
private val coroutineScope = CoroutineScope(viewModelJob + Dispatchers.Main)
init {
getCocktails()
}
private fun getCocktails() {
coroutineScope.launch {
val getCocktailsDeferred = CocktailsApi.RETROFIT_SERVICE.getCocktailsAsync()
try {
val result = getCocktailsDeferred.await()
_cocktails.value = result
} catch (e: Exception) {
Log.d("error", "error")
}
}
}
override fun onCleared() {
super.onCleared()
viewModelJob.cancel()
}
}
Adapter
class CocktailListAdapter :
ListAdapter<Cocktail, CocktailListAdapter.CocktailListViewHolder>(DiffCallback) {
class CocktailListViewHolder(private var binding: CocktailItemBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(cocktail: Cocktail) {
binding.cocktail = cocktail
binding.executePendingBindings()
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CocktailListViewHolder {
return CocktailListViewHolder(CocktailItemBinding.inflate(LayoutInflater.from(parent.context)))
}
override fun onBindViewHolder(holder: CocktailListViewHolder, position: Int) {
val cocktail = getItem(position)
holder.bind(cocktail)
}
companion object DiffCallback : DiffUtil.ItemCallback<Cocktail>() {
override fun areItemsTheSame(oldItem: Cocktail, newItem: Cocktail): Boolean {
return oldItem === newItem
}
override fun areContentsTheSame(oldItem: Cocktail, newItem: Cocktail): Boolean {
return oldItem.id == newItem.id
}
}
}
BindingAdapters
#BindingAdapter("listData")
fun bindRecyclerView(recyclerView: RecyclerView, data: CocktailsList?) {
val adapter = recyclerView.adapter as CocktailListAdapter
adapter.submitList(data?.list)
}
#BindingAdapter("strDrinkThumb")
fun bindImage(imgView: ImageView, imgUrl: String?) {
imgUrl?.let {
val imgUri = imgUrl.toUri().buildUpon().scheme("https").build()
Picasso.get()
.load(imgUri)
.placeholder(R.drawable.loading_animation)
.error(R.drawable.ic_broken_image)
.into(imgView)
}
}
ApiService
private const val BASE_URL =
"https://www.thecocktaildb.com"
private val gson = GsonConverterFactory.create(GsonBuilder().create())
val logging = HttpLoggingInterceptor()
val okhttpClient = OkHttpClient.Builder()
.addInterceptor(logging.setLevel(HttpLoggingInterceptor.Level.BODY))
.build()
private val retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.client(okhttpClient)
.addConverterFactory(gson)
.addCallAdapterFactory(CoroutineCallAdapterFactory())
.build()
interface CocktailsApiService {
#GET("./api/json/v1/1/filter.php?c=Ordinary_Drink")
fun getCocktailsAsync():
Deferred<CocktailsList>
}
object CocktailsApi {
val RETROFIT_SERVICE: CocktailsApiService by lazy {
retrofit.create(CocktailsApiService::class.java)
}
}
data classes
data class CocktailsList(
val list: List<Cocktail>
)
data class Cocktail (
#SerializedName("idDrink")
val id: String,
#SerializedName("strDrinkThumb")
val drinkImg: String,
#SerializedName("strDrink")
val drinkTitle: String
)
cocktail_list_fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="cocktail"
type="com.example.coctaildb.cocktaillist.CocktailListViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="30dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#android:color/white"
app:menu="#menu/filter_menu"
app:title="#string/drinks"
app:titleTextColor="#android:color/black" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/cocktail_list"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/appBarLayout2"
app:listData="#{cocktail.cocktails}"
tools:listitem="#layout/cocktail_item" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
cocktail_item.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="cocktail"
type="com.example.coctaildb.network.Cocktail" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/cocktail_img"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginStart="20dp"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp"
app:strDrinkThumb="#{cocktail.drinkImg}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="#tools:sample/avatars" />
<TextView
android:id="#+id/cocktail_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="21dp"
android:layout_marginEnd="20dp"
android:fontFamily="#font/roboto"
android:text="#{cocktail.drinkTitle}"
android:textColor="#7E7E7E"
android:textSize="16sp"
app:layout_constraintBottom_toBottomOf="#+id/cocktail_img"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/cocktail_img"
app:layout_constraintTop_toTopOf="#+id/cocktail_img" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
I suppose i messed up with data type in binding, please help.

I think problem is in serialisation. try
data class CocktailsList(
#SerializedName("drinks")
val list: List<Cocktail>
)

Data binding in recylerview adapter android?

I want to bind data to my recylerview adapter. This is my current code following the MVVM pattern
Fragment
class NotificationFragment : Fragment() {
var customeProgressDialog: CustomeProgressDialog? = null
private val appPreferences: AppPreference by inject()
private val notificationViewModel: NotificationViewModel by viewModel()
private lateinit var binding: FragmentNotificationBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentNotificationBinding.inflate(inflater, container, false)
return binding.getRoot()
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.notification.layoutManager=LinearLayoutManager(activity, LinearLayoutManager.VERTICAL, false)
customeProgressDialog = CustomeProgressDialog(activity)
notificationViewModel.notifications(
appPreferences.getUsername(),
appPreferences.getPassword(),
appPreferences.getUserId()
)
initObservables()
}
private fun initObservables() {
notificationViewModel.progressDialog?.observe(this, Observer {
if (it!!) customeProgressDialog?.show() else customeProgressDialog?.dismiss()
})
notificationViewModel.apiResponse?.observe(
viewLifecycleOwner,
androidx.lifecycle.Observer { response ->
if (response.dataList != null) {
val notificationAdapter = NotificationAdapter(response.dataList as List<Data>)
notificationAdapter.notifyDataSetChanged()
binding.notification.adapter = notificationAdapter
}
})
}
}
View model
class NotificationViewModel(networkCall: NetworkCall) : ViewModel(),
Callback<ApiResponse> {
var progressDialog: SingleLiveEvent<Boolean>? = null
var apiResponse: MutableLiveData<ApiResponse>? = null
var networkCall: NetworkCall;
init {
progressDialog = SingleLiveEvent<Boolean>()
apiResponse = MutableLiveData<ApiResponse>()
this.networkCall = networkCall
}
fun notifications(username: String?, password: String?, userId: String?) {
progressDialog?.value = true
val apiPost = ApiPost()
apiPost.userName = username
apiPost.password = password
apiPost.UserId = userId
apiPost.FileType = NetworkConstant.FILE_TYPE_NOT
networkCall.getPDF(apiPost).enqueue(this)
}
override fun onFailure(call: Call<ApiResponse>, t: Throwable) {
progressDialog?.value = false
}
override fun onResponse(call: Call<ApiResponse>, response: Response<ApiResponse>) {
progressDialog?.value = false
apiResponse?.value = response.body()
}
}
The adapter
class NotificationAdapter(private val list: List<Data>) :
RecyclerView.Adapter<NotificationAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val inflater = LayoutInflater.from(parent.context)
val binding = ElementListBinding.inflate(inflater)
// val view = inflater.inflate(R.layout.element_list, parent, false)
return ViewHolder(binding)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val movie: Data = list[position]
holder.bind(movie)
holder.itemView.setOnClickListener {
if (!TextUtils.isEmpty(movie.filePath)) {
try {
val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse(movie.filePath))
holder.itemView.context.startActivity(browserIntent)
} catch (e: Exception) {
e.printStackTrace()
}
}
}
}
override fun getItemCount(): Int = list.size
inner class ViewHolder(binding: ElementListBinding) : RecyclerView.ViewHolder(binding.root) {
fun bind(movie: Data) {
binding.item = movie
}
}
}
unable to find binding object
the recylerview element list xml
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="data"
type="com.mountmeru.model.Data" />
</data>
<androidx.cardview.widget.CardView
android:id="#+id/main_cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp">
<androidx.appcompat.widget.LinearLayoutCompat
android:id="#+id/main_cardrl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<RelativeLayout
android:id="#+id/rl_newsdate"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.3">
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tv_notifi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:maxLines="2"
android:text="#{data.displayName}"
android:textColor="#android:color/black"
android:textSize="16sp" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tv_brief"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tv_notifi"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:layout_marginRight="10dp"
android:textColor="#android:color/black"
android:textSize="16sp"
android:visibility="gone" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tv_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tv_brief"
android:layout_marginLeft="10dp"
android:layout_marginTop="2dp"
android:layout_marginRight="10dp"
android:maxLines="1"
android:text="hey i am date"
android:textColor="#color/inactive_text"
android:textSize="14sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_toRightOf="#+id/rl_newsdate"
android:layout_weight="0.7"
android:padding="5dp">
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/iv_notifi"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/mer" />
</RelativeLayout>
</androidx.appcompat.widget.LinearLayoutCompat>
</androidx.cardview.widget.CardView>
</layout>
Can someone confirm me is my implementation of MVVM correct or it needs some refactoring?
How do I make of data binding in my recyclerview list element xml?

You have already used <layout> as parent tag in element_list.xml. Now you can inflate it in the adapter class using DataBinding. See the example below:
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val binding = ElementListBinding.inflate(LayoutInflater.from(parent.context), parent, false)
return ViewHolder(Binding)
}
You have to modify your ViewHolder class as well as shown below:
inner class ViewHolder(val binding: ElementListBinding) : RecyclerView.ViewHolder(binding.root) {
fun bind(movie: Data) {
with(itemView) {
binding.tvNotifi.text = movie.displayName
binding.tvDate.text = movie.UpdatedDate
if (movie.description != null) {
binding.tvBrief.text = movie.description
binding.tvBrief.visibility = View.VISIBLE
}
}
}
}

Bind viewmodel to recyclerview item.xml with databinding, android?

I want to bind data on adapter from viewmodel in xml layout file
This is my fragment class.
class NotificationFragment : Fragment() {
var customeProgressDialog: CustomeProgressDialog? = null
private val appPreferences: AppPreference by inject()
private val notificationViewModel: NotificationViewModel by viewModel()
private lateinit var binding: FragmentNotificationBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentNotificationBinding.inflate(inflater, container, false)
return binding.getRoot()
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.notification.layoutManager=LinearLayoutManager(activity, LinearLayoutManager.VERTICAL, false)
customeProgressDialog = CustomeProgressDialog(activity)
notificationViewModel.notifications(
appPreferences.getUsername(),
appPreferences.getPassword(),
appPreferences.getUserId()
)
initObservables()
}
private fun initObservables() {
notificationViewModel.progressDialog?.observe(this, Observer {
if (it!!) customeProgressDialog?.show() else customeProgressDialog?.dismiss()
})
notificationViewModel.apiResponse?.observe(
viewLifecycleOwner,
androidx.lifecycle.Observer { response ->
if (response.dataList != null) {
var notificationAdapter = NotificationAdapter(response.dataList as List<Data>)
notificationAdapter.notifyDataSetChanged()
binding.notification.adapter = notificationAdapter
}
})
}
}
My viewmodel
class NotificationViewModel(networkCall: NetworkCall) : ViewModel(),
Callback<ApiResponse> {
var progressDialog: SingleLiveEvent<Boolean>? = null
var apiResponse: MutableLiveData<ApiResponse>? = null
var networkCall: NetworkCall;
init {
progressDialog = SingleLiveEvent<Boolean>()
apiResponse = MutableLiveData<ApiResponse>()
this.networkCall = networkCall
}
fun notifications(username: String?, password: String?, userId: String?) {
progressDialog?.value = true
val apiPost = ApiPost()
apiPost.userName = username
apiPost.password = password
apiPost.UserId = userId
apiPost.FileType = NetworkConstant.FILE_TYPE_NOT
networkCall.getPDF(apiPost).enqueue(this)
}
override fun onFailure(call: Call<ApiResponse>, t: Throwable) {
progressDialog?.value = false
}
override fun onResponse(call: Call<ApiResponse>, response: Response<ApiResponse>) {
progressDialog?.value = false
apiResponse?.value = response.body()
}
}
The adapter class
lass NotificationAdapter(private val list: List<Data>) :
RecyclerView.Adapter<NotificationAdapter.ViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val inflater = LayoutInflater.from(parent.context)
val view = inflater.inflate(R.layout.element_list, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val movie: Data = list[position]
holder.bind(movie)
holder.itemView.setOnClickListener {
if (!TextUtils.isEmpty(movie.filePath)) {
try {
val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse(movie.filePath))
holder.itemView.context.startActivity(browserIntent)
} catch (e: Exception) {
e.printStackTrace()
}
}
}
}
override fun getItemCount(): Int = list.size
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bind(movie: Data) {
with(itemView) {
tv_notifi.text = movie.displayName
tv_date.text = movie.UpdatedDate
if (movie.description != null) {
tv_brief.text = movie.description
tv_brief.visibility = View.VISIBLE
}
}
}
}
}
This is my item xml layout
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="viewmodel"
type="com.mountmeru.viewmodel.NotificationViewModel" />
</data>
<androidx.cardview.widget.CardView
android:id="#+id/main_cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp">
<androidx.appcompat.widget.LinearLayoutCompat
android:id="#+id/main_cardrl"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<RelativeLayout
android:id="#+id/rl_newsdate"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.3">
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tv_notifi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:maxLines="2"
android:text="hey i am notification text"
android:textColor="#android:color/black"
android:textSize="16sp" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tv_brief"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tv_notifi"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:layout_marginRight="10dp"
android:textColor="#android:color/black"
android:textSize="16sp"
android:visibility="gone" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tv_date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/tv_brief"
android:layout_marginLeft="10dp"
android:layout_marginTop="2dp"
android:layout_marginRight="10dp"
android:maxLines="1"
android:text="hey i am date"
android:textColor="#color/inactive_text"
android:textSize="14sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_toRightOf="#+id/rl_newsdate"
android:layout_weight="0.7"
android:padding="5dp">
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/iv_notifi"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/mer" />
</RelativeLayout>
</androidx.appcompat.widget.LinearLayoutCompat>
</androidx.cardview.widget.CardView>
</layout>
I was able to do the binding for the fragment but for adapter I am unsure how to proceed.

If I understand your question correctly, you want to pass data to your adapter inside xml. For this, you will need to write custom binding adapter for your RecyclerView.
This link has all you need.
https://android.jlelse.eu/how-to-bind-a-list-of-items-to-a-recyclerview-with-android-data-binding-1bd08b4796b4

RecyclerView doesn't appear when back pressed

I see the problem with a RecyclerView in viewpager fragment and I use bottom naviagation bar. When I tab on the navigation bar to change a screen and then pressed on back button it will go to the first screen which have the viewpager but the recyclerview doesn't appear and when I tab the naviagtion bar to reselect this screen it appear.
The recyclerview is show the list from firestore database and using ViewModel.
I try to set retainInstance to true but it doesn't work. And try to setup the recyclerview in onCreate and onCreateView it doesn't work too.
Edit: this is my code.
MainActivity.kt
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val navView: BottomNavigationView = findViewById(R.id.nav_view)
val navController = findNavController(R.id.nav_host_fragment)
navView.setupWithNavController(navController)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId){
android.R.id.home -> {
onBackPressed()
return true
}
}
return super.onOptionsItemSelected(item)
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/nav_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="0dp"
android:layout_marginEnd="0dp"
android:background="#drawable/bg_nav"
app:itemIconTint="#color/navbar_color"
app:itemTextColor="#color/navbar_color"
app:itemTextAppearanceActive="#style/navbar_font"
app:itemTextAppearanceInactive="#style/navbar_font"
app:itemBackground="#drawable/nav_ripple"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/bottom_nav_menu"/>
<fragment
android:id="#+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="0dp"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toTopOf="#id/nav_view"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="#navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
HomeFragement.kt (it contain tablayout and viewpager)
class HomeFragment : Fragment() {
private lateinit var homeViewModel: HomeViewModel
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
homeViewModel =
ViewModelProviders.of(this).get(HomeViewModel::class.java)
val root = inflater.inflate(R.layout.fragment_home, container, false)
return root
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
setupTab()
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
}
private fun setupTab(){
Log.d("SET UP TAB", "SETTING UP")
val pageTabAdapter = PageTabAdapter(activity!!.supportFragmentManager, activity_tab.tabCount)
view_activity.adapter = pageTabAdapter
view_activity.addOnPageChangeListener(TabLayout.TabLayoutOnPageChangeListener(activity_tab))
activity_tab.setOnTabSelectedListener(object : TabLayout.OnTabSelectedListener{
override fun onTabReselected(p0: TabLayout.Tab?) {
}
override fun onTabUnselected(p0: TabLayout.Tab?) {
}
override fun onTabSelected(p0: TabLayout.Tab?) {
view_activity.currentItem = p0!!.position
}
})
}
}
fragment_home.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
android:orientation="vertical">
<TextView
android:id="#+id/home_header"
style="#style/page_header"
android:text="#string/title_home"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<Button
android:id="#+id/calendar_btn"
android:layout_width="60dp"
android:layout_height="40dp"
android:background="#drawable/btn_calendar"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="#id/home_header"
app:layout_constraintBottom_toBottomOf="#id/home_header"
android:layout_marginEnd="10dp"/>
<com.google.android.material.tabs.TabLayout
android:id="#+id/activity_tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabRippleColor="#color/colorPrimary"
app:tabTextAppearance="#style/tab_font"
app:tabIndicatorHeight="2.5dp"
app:tabGravity="fill"
app:layout_constraintTop_toBottomOf="#id/home_header"
app:layout_constraintStart_toStartOf="parent"
android:background="#android:color/white">
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="กิจกรรมในเดือนนี้" />
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="กิจกรรมที่ผ่านไปแล้ว" />
</com.google.android.material.tabs.TabLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/view_activity"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintTop_toBottomOf="#id/activity_tab"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
PageAdapter.kt
class PageTabAdapter(private val fragmentManager: FragmentManager, private val anInt: Int) :
FragmentStatePagerAdapter(fragmentManager) {
override fun getItem(position: Int): Fragment {
return when (position) {
0 -> {
NewActivity.newInstance()
}
1 -> {
PastActivity.newInstance()
}
else -> {
null!!
}
}
}
override fun getCount(): Int {
return anInt
}
}
ActivityAdapter.kt (this is a recyclerview adapter)
class ActivityAdapter(
private val mContext: Context, private val mItems: List<ActivityModel>
): RecyclerView.Adapter<ActivityAdapter.Holder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
val inflater = LayoutInflater.from(this.mContext)
val view = inflater.inflate(R.layout.activity_list, parent, false)
return Holder(view)
}
override fun getItemCount(): Int {
return this.mItems.size
}
override fun onBindViewHolder(holder: Holder, position: Int) {
val item = this.mItems[position]
holder.setName(item.name)
val date = item.date?.toDate()
val dateFormat: DateFormat = SimpleDateFormat("dd-MMM-yyyy")
val newDate = dateFormat.format(date).toString()
holder.setDate(newDate)
val period = item.start + " - " +item.end
holder.setPeriod(period)
holder.setButton(item)
}
inner class Holder(view: View): RecyclerView.ViewHolder(view){
private var activityName: TextView = view.activity_list_name
private var activityDate: TextView = view.activity_list_date
private var activityPeriod: TextView = view.activity_list_period
private var activityPicture: ImageView = view.activity_list_pic
private var activityButton: Button = view.activity_list_btn
fun setName(name: String?){
this.activityName.text = name
}
fun setDate(date: String?){
this.activityDate.text = date
}
fun setPeriod(period: String?){
this.activityPeriod.text = period
}
fun setPicture(picpath: String?){
}
fun setButton(data: ActivityModel){
}
}
}
}
PS.: I'm using Kotlin in my project
Thank you