The addOnScrollListener for my RecyclerView not working as expected - kotlin

Question

I want to know when I am at the bottom of my recycler view but I can't get why the recyclerView.canScrollVertically(1) is always returning true even if I am at the bottom of the Recycler View.
The recycler view is inside a CoordinatorLayout with an AppBarLayout.
You have the Kotlin code and the XML code for the bigger picture
Thank you.
getDataBinding().shipmentRecyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
Log.e(TAG,
"onScrollStateChanged 1: This is the bottom shipmentRecyclerView $newState <> ${RecyclerView.SCROLL_STATE_IDLE} ${
recyclerView.canScrollVertically(1)
}")
if (!getDataBinding().shipmentRecyclerView.canScrollVertically(1) && newState == RecyclerView.SCROLL_STATE_IDLE) {
Log.e(TAG, "onScrollStateChanged 2: This is the bottom shipmentRecyclerView")
if (viewModel.currentPage.get()!! < viewModel.totalPages.get()!!) {
viewModel.getShipmentByPage(
viewModel.currentPage.get()!! + 1,
viewModel.request.get()
)
}
}
}
})
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<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>
<import type="android.view.View" />
<variable
name="viewModel"
type="com.technifyit.jibheli.presentation.main.fragment.search.SearchViewModel" />
</data>
<com.sothree.slidinguppanel.SlidingUpPanelLayout
android:id="#+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
app:umanoPanelHeight="0dp"
app:umanoShadowHeight="#dimen/margin_4dp"
tools:context=".presentation.main.fragment.search.SearchFragment">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/shipment_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="#dimen/margin_12dp"
android:clipToPadding="true"
android:fastScrollEnabled="true"
app:layout_anchor="#id/app_bar_layout"
app:layout_anchorGravity="bottom"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
app:shipment_adapter="#{viewModel}" />
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/dark_color_purple"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
...........
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/dark_color_purple"
android:paddingLeft="0dp"
android:paddingRight="0dp"
android:visibility="gone"
app:contentInsetStart="0dp"
app:layout_anchor="#id/app_bar_layout"
app:layout_anchorGravity="bottom"
app:layout_collapseMode="pin"
app:theme="#style/ThemeOverlay.AppCompat.Dark"
app:title="">
.........
</androidx.appcompat.widget.Toolbar>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/custom_web_page_browser"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="#dimen/margin_40dp"
android:background="#drawable/background_rounded_top"
android:backgroundTint="#color/grey_clair">
<com.technifyit.jibheli.presentation.customView.MontserratBoldTextView
android:id="#+id/url_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/margin_20dp"
android:layout_marginEnd="#dimen/margin_6dp"
android:text="#string/activity_item_details_send_request_button_text"
android:textColor="#color/dark_color_purple"
android:textSize="#dimen/title_size_sign_up"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="#id/close"
app:layout_constraintEnd_toStartOf="#id/use_link_image_view"
app:layout_constraintStart_toEndOf="#id/close"
app:layout_constraintTop_toTopOf="#id/close" />
<ImageView
android:id="#+id/close"
android:layout_width="#dimen/icon_24dp"
android:layout_height="#dimen/icon_24dp"
android:layout_margin="#dimen/margin_6dp"
android:background="#drawable/ic_close_gold"
android:backgroundTint="#color/dark_color_purple"
android:padding="#dimen/margin_4dp"
android:src="#drawable/ic_close_native"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:tint="#color/white" />
<com.technifyit.jibheli.presentation.customView.MontserratBoldTextView
android:id="#+id/use_link_image_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="#dimen/margin_6dp"
android:background="#drawable/button_rounded_left_only_no_icon"
android:backgroundTint="#color/dark_color_purple"
android:drawableEnd="#drawable/ic_check_native"
android:drawablePadding="#dimen/margin_6dp"
android:gravity="center"
android:paddingStart="#dimen/margin_8dp"
android:paddingEnd="#dimen/margin_8dp"
android:text="#string/select"
android:textAllCaps="false"
android:textColor="#color/white"
app:drawableTint="#color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="#dimen/margin_4dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#id/close">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<include
android:id="#+id/no_item_found_suggested_layout"
layout="#layout/no_item_found_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/requested_shipments_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/margin_6dp"
android:fastScrollEnabled="true"
app:layout_constraintTop_toTopOf="parent"
app:requested_shipment_adapter="#{viewModel}" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/requested_trip_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/margin_6dp"
android:fastScrollEnabled="true"
app:layout_constraintTop_toTopOf="parent"
app:requested_trip_adapter="#{viewModel}" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
</com.sothree.slidinguppanel.SlidingUpPanelLayout>
</layout>

Answer 1

Thank you for your response, i did find a solution by adding to my recycler view in xml
addOnScrolledToBottomListener="#{viewModel}" and then in the bindingAdapter
#BindingAdapter("addOnScrolledToBottomListener")
fun addOnScrolledToBottomListener(recyclerView: RecyclerView, viewModel: SearchViewModel) {
recyclerView.addOnScrollListener(object :
RecyclerView.OnScrollListener() {
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
if (recyclerView.canScrollVertically(1) && newState == RecyclerView.SCROLL_STATE_IDLE) {
if (viewModel.currentPage.get()!! < viewModel.totalPages.get()!!) {
viewModel.getShipmentByPage(
viewModel.currentPage.get()!! + 1,
viewModel.request.get()
)
}
}
}
})
}`
and like that it worked like a charm, Thank you #xinaiz for your help