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update recyclerview item value on Text change of other item value entered

I have a recyclerview where view type is edittext and on value entered of the edittext, other edittext values should be added with current value.
value entered in edittext item 1 of recyclerview and value entered in edittext item 2 should be the sum in the edittext item 3 which is not editable.
So in below code, the type 'Edittext' is used to identify that these edittext have text watchers and on change of these editttext values, the values of calculations be set in else part.
How to update the data in else code when i am updating the text in editable edittext. this is my code below.
Anyone having solution,
// enter code here
class ProfileDataSubAdapter(
val context: Context,
var repeatedDataList: RealmList<EntityDetails>
) : RecyclerView.Adapter<ProfileDataSubAdapter.DataAdapterViewHolder>() {
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): DataAdapterViewHolder {
val layout = when (viewType) {
TYPE_EDITTEXT -> R.layout.item_edittext
TYPE_SPINNER -> R.layout.item_spinner
TYPE_CALCULATE -> R.layout.item_edittext
else -> throw IllegalArgumentException("Invalid view type")
}
val view = LayoutInflater
.from(context)
.inflate(layout, parent, false)
return DataAdapterViewHolder(view)
}
override fun onBindViewHolder(holder: DataAdapterViewHolder, position: Int) {
holder.bind(repeatedDataList[position], context, position)
}
fun getRepeatedList(): RealmList<EntityDetails>? {
repeatedDataList.forEach {
if (it.ValueType.equals("EditText") && it.UserEnterValue?.isNullOrEmpty()!!) {
Toast.makeText(context, "Field ${it.EntityName} is empty", Toast.LENGTH_LONG).show()
return null;
}
}
return repeatedDataList
}
override fun getItemCount(): Int = repeatedDataList.size
override fun getItemViewType(position: Int): Int {
if (repeatedDataList[position]?.ValueType == "EditText") {
return TYPE_EDITTEXT
} else if (repeatedDataList[position]?.ValueType == "RadioButton") {
return TYPE_SPINNER
} else
return TYPE_CALCULATE
}
companion object {
private const val TYPE_EDITTEXT = 0
private const val TYPE_SPINNER = 1
private const val TYPE_CALCULATE = 3
}
inner class DataAdapterViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
fun bindEdittextData(item: EntityDetails, position: Int) {
//Do your view assignment here from the data model
itemView.findViewById<TextView>(R.id.tv_edit_text_label)?.text = item.EntityName
val content = itemView.findViewById<EditText>(R.id.et_content)
if (item.UserEnterValue?.isNotEmpty()!!) {
content.setText(item.UserEnterValue)
}
//if type is edittext then set text watchers here
if (item.ValueType == "EditText") {
content.addTextChangedListener(object : TextWatcher {
override fun beforeTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
}
override fun onTextChanged(p0: CharSequence?, p1: Int, p2: Int, p3: Int) {
repeatedDataList[position]?.UserEnterValue = p0.toString()
}
override fun afterTextChanged(p0: Editable?) {
}
})
}
// else if type is calculation set the total here
else {
content.setInputType(InputType.TYPE_NULL)
}
}
fun bindSpinnerData(item: EntityDetails, context: Context) {
//Do your view assignment here from the data model
itemView.findViewById<TextView>(R.id.tv_spinner_label)?.text = item.EntityName
val spinner = itemView.findViewById<Spinner>(R.id.spinner_content)
spinner.adapter = ArrayAdapter<String>(
context,
R.layout.row_spinner,
R.id.txt_content,
item.Values?.map { it.Value } as MutableList<String>
)
// spnr_house.setSelection(getIndexSpinner(spnr_house, noOfYearsInCurrentHouse?.trim()))
spinner.setSelection(item.Values!!.indexOfFirst {
it.IsSelected == true
}, false)
// spinner.setSelection()
spinner.onItemSelectedListener =
object : AdapterView.OnItemSelectedListener {
override fun onNothingSelected(view: AdapterView<*>?) {
}
override fun onItemSelected(
parentView: AdapterView<*>?,
selectedView: View?,
pos: Int,
id: Long
) {
val selectedItem =
spinner.getItemAtPosition(pos)
.toString()
if (selectedItem != "Select") {
item.Values?.find { it.Value == selectedItem }?.IsSelected =
true
val list = item.Values?.filter { it.Value != selectedItem }
list?.forEach { it.IsSelected = false }
}
}
}
}
fun bind(
dataModel: EntityDetails?,
context: Context,
position: Int
) {
if (dataModel?.ValueType == "EditText" || dataModel?.ValueType == "Calculation")
bindEdittextData(dataModel, position)
else if (dataModel?.ValueType == "RadioButton")
bindSpinnerData(dataModel, context)
}
}
}
//end code

TabLayout does not display tabs items

I try connect TabLayout with ViewPager2 via TabLayoutMediator but items not displayed correctly
How i can fix it ?
Here is my code :
class ScreenSlidePagerAdapter(fa: FragmentActivity) : FragmentStateAdapter(fa) {
override fun getItemCount(): Int = 3
override fun createFragment(position: Int) = SalesOfficesFragment()
}
private fun initViews() {
val pagerAdapter = ScreenSlidePagerAdapter(context as FragmentActivity)
binding.viewPager.adapter = pagerAdapter
TabLayoutMediator(binding.tabLayout, binding.viewPager) { tab, position ->
}.attach()
}

You need to set the tab.text in the TabLayoutMediator:
private fun initViews() {
val pagerAdapter = ScreenSlidePagerAdapter(context as FragmentActivity)
binding.viewPager.adapter = pagerAdapter
TabLayoutMediator(binding.tabLayout, binding.viewPager) { tab, position ->
// Set the title of the tabs
when (position) {
0 -> tab.text = "First element"
else -> tab.text = "Other elements"
}
}.attach()
}

How to combine two Adapter from call response in Android Java?

Is there a way to combine two adapters that are inside a Callback from Model?
Like, I get data from two sources and I want to display both of them in the same recyclerView
I tried to load the method first then put both adapters on concatAdapter but I got a null from this concatAdapter and then my app crashed
here is my method in Java
private void fetchDataKabupaten(){
progressBar.setVisibility(View.VISIBLE);
token = getIntent().getStringExtra("token");
Call<KabupatenModel> kabupatenModelCall = RetrofitClient.getLoginInterface().getKabupatenData("Bearer "+token);
kabupatenModelCall.enqueue(new Callback<KabupatenModel>() {
#Override
public void onResponse(Call<KabupatenModel> call, Response<KabupatenModel> response) {
kabupatenList = response.body().getKabupaten();
adKabupaten = new KabupatenAdapter(MainActivity.this, kabupatenList);
progressBar.setVisibility(View.GONE);
}
}
private void fetchDataKecamatan(){
progressBar.setVisibility(View.VISIBLE);
token = getIntent().getStringExtra("token");
Call<KecamatanModel> kecamatanModelCall = RetrofitClient.getLoginInterface().getKecamatanData("Bearer " + token);
kecamatanModelCall.enqueue(new Callback<KecamatanModel>() {
#Override
public void onResponse(Call<KecamatanModel> call, Response<KecamatanModel> response) {
kecamatanList = response.body().getKecamatan();
adKecamatan = new KecamatanAdapter(MainActivity.this, kecamatanList);
progressBar.setVisibility(View.GONE);
}
}
I have tried to call both in MainActivity then setAdapter with concatAdapter like this:
fetchDataKabupaten();
fetchDataKecamatan();
concatAdapter = new ConcatAdapter(adKecamatan, adKabupaten);
rV.setAdapter(concatAdapter);
why is it null?
but, when I only set one Adapter inside the response method it works.

you can only use one adapter in recyclerview, but adapter can have multiple view.
for example I have adapter for chat, with right and left view
Adapter Chat Detail
class AdapterChatDetail(val datas: ArrayList<ChatMessage>) :
RecyclerView.Adapter<RecyclerView.ViewHolder>() {
private lateinit var ctx: Context
companion object {
const val LEFT = 0
const val RIGHT = 1
}
inner class ViewHolderLeft(val binding: AdapterMyChatLeftBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(data: ChatMessage) {
}
}
inner class ViewHolderRight(val binding: AdapterMyChatRightBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(data: ChatMessage) {
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
ctx = parent.context
return when (viewType) {
LEFT -> ViewHolderLeft(
AdapterMyChatLeftBinding.inflate(
LayoutInflater.from(ctx),
parent,
false
)
)
RIGHT -> ViewHolderRight(
AdapterMyChatRightBinding.inflate(
LayoutInflater.from(ctx),
parent,
false
)
)
else -> ViewHolderLeft(
AdapterMyChatLeftBinding.inflate(
LayoutInflater.from(ctx),
parent,
false
)
)
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
when (getItemViewType(position)) {
LEFT -> (holder as ViewHolderLeft).bind(datas[position])
RIGHT -> (holder as ViewHolderRight).bind(datas[position])
}
}
override fun getItemCount() = datas.size
override fun getItemViewType(position: Int): Int {
val data = datas[position]
return if (data.position == "right") RIGHT else LEFT
}
}

Swipe detection and Touch listener not working inside fragment

App has bottom navigation menus and fragments. This is the fragment which requires swipe detection similar to Tinder:
class HomeFragment : Fragment() {
private lateinit var homeViewModel: HomeViewModel
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
homeViewModel =
ViewModelProvider(this).get(HomeViewModel::class.java)
val root = inflater.inflate(R.layout.fragment_home, container, false)
val textView: TextView = root.findViewById(R.id.text_home)
homeViewModel.text.observe(viewLifecycleOwner, {
textView.text = it
})
root.setOnTouchListener(object : OnSwipeTouchListener(requireContext()) {
override fun onSwipeRight() {
Toast.makeText(requireContext(), "Swiped right!", Toast.LENGTH_SHORT).show()
}
override fun onSwipeLeft() {
Toast.makeText(requireContext(), "Swiped left!", Toast.LENGTH_SHORT).show()
}
})
return root
}
}
The app needs Swipe features like Tinder.
Following is the Listener class:
open class OnSwipeTouchListener(ctx: Context) : OnTouchListener {
val gestureDetector: GestureDetector
companion object {
private val SWIPE_THRESHOLD = 100
private val SWIPE_VELOCITY_THRESHOLD = 100
}
init {
gestureDetector = GestureDetector(ctx, GestureListener())
}
override fun onTouch(v: View, event: MotionEvent): Boolean {
var isTouch = false
if (gestureDetector != null && event != null) {
isTouch = gestureDetector.onTouchEvent(event)
} else {
isTouch = true
}
return isTouch
}
inner class GestureListener : SimpleOnGestureListener() {
override fun onDown(e: MotionEvent): Boolean {
return false
}
override fun onFling(e1: MotionEvent?, e2: MotionEvent?, velocityX: Float, velocityY: Float): Boolean {
var result = false
try {
val diffY = e1?.y?.let { e2?.y?.minus(it) }
val diffX = e1?.x?.let { e2?.x?.minus(it) }
if (diffX != null && diffY != null) {
if (abs(diffX) > abs(diffY)) {
if (abs(diffX) > SWIPE_THRESHOLD && abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
if (diffX > 0) {
onSwipeRight()
} else {
onSwipeLeft()
}
result = true
}
}
} else {
onSwipeRight()
result = true
}
} catch (exception: Exception) {
exception.printStackTrace()
}
return result
}
}
open fun onSwipeRight() {}
open fun onSwipeLeft() {}
open fun onSwipeTop() {}
open fun onSwipeBottom() {}
open fun onSwipeDown() {
}
}
The swipe feature or any sort of touch listeners are not working at all. Why is this happening? I'm new to Kotlin and mobile app development. So any help is very appreciated.

In Android, a gesture is defined as the beginning of ACTION_DOWN and ending with ACTION_UP. If you want your view to receive a gesture, you MUST return true for ACTION_DOWN, otherwise, you will got nothing.
Root cause
override fun onDown(e: MotionEvent): Boolean {
return false
}
Because in this callback, you return false, that means your view does not show interest to any gesture, it explains why all callback such as onFling(), onSwipeRight(), onSwipeLeft() is not called.
Solution
Return true for the ACTION_DOWN event.
override fun onDown(e: MotionEvent): Boolean {
return true
}
Here is a great article about the Android Touch System. Please take a look when you have time.

Pagination with staggeredGridLayoutManager and recyclerView

Hello I need to make the infinite scrolling (Pagination) with the recyclerview using the staggeredGridLayoutManager. Pagination is working but the problem is that onLoadMore() function is called so many times while scrolling which causing problems, here is my code:
newSearchAdapter = new NewSearchAdapter(getActivity(), gridData);
StaggeredGridLayoutManager mLayoutManager;
mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
mLayoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE);
rv_NewProfilesGrid.setLayoutManager(mLayoutManager);
rv_NewProfilesGrid.setAdapter(newSearchAdapter);
rv_NewProfilesGrid.addOnScrollListener(new EndlessRecyclerOnScrollListenerStaggeredLayoutmanager(mLayoutManager) {
#Override
public void onLoadMore(int current_page) {
//calling the api
}
});
and here is my scroll listner
I think the problem here is with the getFirstVisibleItems() function because with GridLayoutManger or LinearLayoutManager it returns an integer but with StaggeredLayout it returns an int Array, so I did the following:
public abstract class EndlessRecyclerOnScrollListenerStaggeredLayoutmanager extends RecyclerView.OnScrollListener {
public static String TAG = EndlessRecyclerOnScrollListenerStaggeredLayoutmanager.class.getSimpleName();
private int scrolledDistance = 0;
private boolean controlsVisible = false;
private boolean loading = true; // True if we are still waiting for the last set of data to load.
private int visibleThreshold = 5; // The minimum amount of items to have below your current scroll position before loading more.
public static boolean loadOneTime = false;
private int pastVisibleItems, visibleItemCount, totalItemCount,previousTotal;
private int current_page = 1;
private StaggeredGridLayoutManager mStaggeredGridLayoutManager;
public EndlessRecyclerOnScrollListenerStaggeredLayoutmanager(StaggeredGridLayoutManager staggeredGridLayoutManager) {
this.mStaggeredGridLayoutManager = staggeredGridLayoutManager;
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = recyclerView.getChildCount();
totalItemCount = mStaggeredGridLayoutManager.getItemCount();
int[] firstVisibleItems = null;
firstVisibleItems = mStaggeredGridLayoutManager.findFirstVisibleItemPositions(firstVisibleItems);
if (firstVisibleItems != null && firstVisibleItems.length > 0) {
pastVisibleItems = firstVisibleItems[0];
}
if (loading) {
if ((visibleItemCount + pastVisibleItems) >= totalItemCount) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading && (totalItemCount - visibleItemCount)
<= (pastVisibleItems + visibleThreshold)) {
// End has been reached
// Do something
current_page++;
loadOneTime=false;
onLoadMore(current_page);
loading = true;
}
if (scrolledDistance > 1 && controlsVisible) {
controlsVisible = false;
scrolledDistance = 0;
} else if (scrolledDistance < -1 && !controlsVisible) {
controlsVisible = true;
scrolledDistance = 0;
}
if ((controlsVisible && dy > 0) || (!controlsVisible && dy < 0)) {
scrolledDistance += dy;
}
}
public abstract void onLoadMore(int current_page);
}

Try this. I borrowed it from a stack overflow answer and borrowed another answer and combine to of them I finally solve it.
import android.util.Log
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.StaggeredGridLayoutManager
abstract class PaginationScrollListener constructor() :
RecyclerView.OnScrollListener() {
private lateinit var mLayoutManager: RecyclerView.LayoutManager
constructor(layoutManager: GridLayoutManager) : this() {
this.mLayoutManager = layoutManager
}
constructor(layoutManager: StaggeredGridLayoutManager) : this() {
this.mLayoutManager = layoutManager
}
constructor(layoutManager: LinearLayoutManager) : this() {
this.mLayoutManager = layoutManager
}
/*
Method gets callback when user scroll the search list
*/
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
val visibleItemCount = mLayoutManager.childCount
val totalItemCount = mLayoutManager.itemCount
var firstVisibleItemPosition = 0
when (mLayoutManager) {
is StaggeredGridLayoutManager -> {
val firstVisibleItemPositions =
(mLayoutManager as StaggeredGridLayoutManager).findFirstVisibleItemPositions(null)
// get maximum element within the list
firstVisibleItemPosition = firstVisibleItemPositions[0]
}
is GridLayoutManager -> {
firstVisibleItemPosition =
(mLayoutManager as GridLayoutManager).findFirstVisibleItemPosition()
}
is LinearLayoutManager -> {
firstVisibleItemPosition =
(mLayoutManager as LinearLayoutManager).findFirstVisibleItemPosition()
}
}
if (!isLoading && !isLastPage) {
if (visibleItemCount + firstVisibleItemPosition >= totalItemCount
&& firstVisibleItemPosition >= 0
) {
Log.i(TAG, "Loading more items")
loadMoreItems()
}
}
}
protected abstract fun loadMoreItems()
abstract val isLastPage: Boolean
abstract val isLoading: Boolean
companion object {
private val TAG = PaginationScrollListener::class.java.simpleName
}
}
And use this in your recycler view in this way
rvCategoryProducts.addOnScrollListener(object :
PaginationScrollListener(layoutManager) {
override fun loadMoreItems() {
vm.isLoading = true
vm.currentPage++
GlobalScope.launch {
vm.getCategoryProductByCatId(vm.id, vm.currentPage)
}
}
override val isLastPage: Boolean
get() = vm.isLastPage
override val isLoading: Boolean
get() = vm.isLoading
})