RecyclerView list item view not updating (using DiffUtil.ItemCallback)

RV - recycler view

I have an RV inside an alertdialog. Adapter for the RV extends ListAdapter with DiffUtil.ItemCallback. List for the adapter is being updated every 500ms using countdowntimer (checking whether the list item is downloaded or not).

The problem is, the list is updated and submitted to the adapter with the new data and but the list item view is not updating based on new data provided as shown below. I'm using data/view binding for updating the list item view.

The RV sometimes updates the item view when being scrolled.

PS: The RV is a child of NestedScrollView

This is how it is working right now

Adapter code

class AlarmSongsAdapter(
    private val onItemClicked: (AlarmSongItem) -> Unit,
    private val startDownloading: (String) -> Unit,
    private val insertDownloadEntityInDB: (DownloadEntity) -> Unit
) : ListAdapter<AlarmSongItem, AlarmSongsAdapter.AlarmSongsViewHolder>(DiffUtilCallback) {

object DiffUtilCallback : DiffUtil.ItemCallback<AlarmSongItem>() {
    override fun areItemsTheSame(oldItem: AlarmSongItem, newItem: AlarmSongItem): Boolean {
        return oldItem.id == newItem.id
    }

    override fun areContentsTheSame(oldItem: AlarmSongItem, newItem: AlarmSongItem): Boolean {
        return oldItem == newItem
    }
}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): AlarmSongsViewHolder {
    return AlarmSongsViewHolder(AlarmsSongListItemBinding.inflate(LayoutInflater.from(parent.context), parent, false), onItemClicked, startDownloading, insertDownloadEntityInDB)
}

override fun onBindViewHolder(holder: AlarmSongsViewHolder, position: Int) {
    holder.bind(getItem(position))
}

class AlarmSongsViewHolder(
    private val binding: AlarmsSongListItemBinding,
    private val onItemClicked: (AlarmSongItem) -> Unit,
    private val startDownloading: (String) -> Unit,
    private val insertDownloadEntityInDB: (DownloadEntity) -> Unit
) : RecyclerView.ViewHolder(binding.root) {
    fun bind(alarmSongItem: AlarmSongItem) {
        binding.alarmSongItem = alarmSongItem
        binding.executePendingBindings()
    }

    init {
        binding.downloadButton.setOnClickListener {
            val alarmSongItem = binding.alarmSongItem!!
            when(alarmSongItem.downloadState){
                Download.STATE_STOPPED -> {
                    startDownloading(alarmSongItem.audioFile)
                    val storageInfo = StorageUtils.currentStorageTypeAndPath(binding.root.context)
                    insertDownloadEntityInDB(alarmSongItem.toDownloadEntity(storageInfo))
                }
                else -> {}
            }
        }

        binding.root.setOnClickListener {
            onItemClicked(binding.alarmSongItem!!)
        }
    }
}
}

List item view 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="alarmSongItem"
        type="com.baja.app.domain.models.AlarmSongItem" />
</data>

<com.google.android.material.card.MaterialCardView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    app:cardElevation="5dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="8dp">

        <androidx.cardview.widget.CardView
            android:id="@+id/song_item_thumbnail_container"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:cardBackgroundColor="@android:color/transparent"
            app:cardCornerRadius="6dp"
            app:cardElevation="0dp">

            <ImageView
                android:id="@+id/song_item_thumbnail"
                android:layout_width="60dp"
                android:layout_height="60dp"
                android:layout_centerVertical="true"
                android:scaleType="centerCrop"
                app:srcCompat="@drawable/bg_default_light"
                tools:ignore="ContentDescription"
                app:thumbnailFromUri="@{alarmSongItem.thumbnail}" />

        </androidx.cardview.widget.CardView>

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:id="@+id/download_progress_container"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true">

            <ImageView
                android:id="@+id/download_bg"
                android:layout_width="32dp"
                android:layout_height="32dp"
                android:scaleType="centerCrop"
                app:srcCompat="?bg_default_circular"
                tools:ignore="ContentDescription"
                android:layout_centerInParent="true" />

            <com.google.android.material.button.MaterialButton
                android:id="@+id/download_button"
                style="@style/AppTheme.OutlinedButton.Icon"
                android:layout_width="32dp"
                android:layout_height="32dp"
                app:cornerRadius="32dp"
                app:icon="@drawable/ic_download"
                app:iconTint="@android:color/white"
                changeIcon="@{alarmSongItem.downloadState}"
                android:layout_centerInParent="true" />

            <com.google.android.material.progressindicator.ProgressIndicator
                android:id="@+id/download_progress_bar"
                style="@style/Widget.MaterialComponents.ProgressIndicator.Circular.Indeterminate"
                android:layout_width="33dp"
                android:layout_height="33dp"
                app:circularRadius="17dp"
                app:indicatorColor="?attr/progressIndicatorColor"
                app:indicatorWidth="1dp"
                showProgressBar="@{alarmSongItem.downloadState}"
                android:layout_centerInParent="true"
                android:visibility="gone" />

        </RelativeLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:layout_marginStart="20dp"
            android:layout_toEndOf="@id/song_item_thumbnail_container"
            android:orientation="vertical"
            android:weightSum="2"
            android:layout_toStartOf="@id/download_progress_container"
            android:layout_marginEnd="8dp">

            <TextView
                android:id="@+id/song_item_name"
                android:layout_width="wrap_content"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:ellipsize="end"
                android:gravity="bottom"
                android:maxLines="1"
                android:textSize="16sp"
                android:textStyle="bold"
                tools:text="Sa re ga ma pa"
                android:text="@{alarmSongItem.title}" />


            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:orientation="horizontal">

                <TextView
                    android:id="@+id/song_item_artist"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_marginEnd="4dp"
                    android:ellipsize="end"
                    android:gravity="center_vertical"
                    android:maxWidth="150dp"
                    android:maxLines="1"
                    android:textSize="14sp"
                    tools:text="Sidharth Arun"
                    android:text="@{alarmSongItem.artist}" />

                <View
                    android:layout_width="5dp"
                    android:layout_height="5dp"
                    android:layout_gravity="center_vertical"
                    android:background="@drawable/dot" />

                <TextView
                    android:id="@+id/song_item_duration"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_marginStart="4dp"
                    android:ellipsize="end"
                    android:gravity="center_vertical"
                    android:maxLines="1"
                    tools:text="10:12"
                    app:formatDuration="@{alarmSongItem.duration}" />

            </LinearLayout>
        </LinearLayout>
    </RelativeLayout>

</com.google.android.material.card.MaterialCardView>

Binding Adapter functions

@BindingAdapter("thumbnailFromUri")
fun thumbnailFromUri(view: ImageView, uri: String) {
    Glide.with(view).load(uri).placeholder(R.drawable.bg_default_light).error(R.drawable.bg_default_light).into(view)
}

@BindingAdapter("changeIcon")
fun changeIconBasedOnDownloadState(view: MaterialButton, state: Int) {
    when (state) {
        Download.STATE_COMPLETED -> view.setIconResource(R.drawable.ic_check)
        else -> view.setIconResource(R.drawable.ic_download)
    }
}

@BindingAdapter("showProgressBar")
fun showProgressbarBasedOnState(view: ProgressIndicator, state: Int) {
    when (state) {
        Download.STATE_QUEUED,
        Download.STATE_RESTARTING,
        Download.STATE_DOWNLOADING -> view.visibility = View.VISIBLE
        else -> view.visibility = View.GONE
    }
}

from RecyclerView list item view not updating (using DiffUtil.ItemCallback)