Android paging with swipe to refresh inside CoordinatorLayout getting error

Question

recyclerview consistency error one first refresh working properly on second refresh getting error. no line number in stack.

    <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:aapt="http://schemas.android.com/aapt"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/parent_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        android:background="@color/white_color">
    <androidx.swiperefreshlayout.widget.SwipeRefreshLayout
            android:id="@+id/swipe_refresh_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"

            android:layout_marginStart="4dp"
            android:layout_marginEnd="4dp"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/rvPost"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:clipToPadding="false"
                android:orientation="vertical"
                android:paddingTop="19dp"
                app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
                app:layout_behavior="@string/appbar_scrolling_view_behavior"
                app:spanCount="3" />
        </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
    </androidx.coordinatorlayout.widget.CoordinatorLayout>

SwipeRefreshLayout   swipeRefreshLayout = getView().findViewById(R.id.swipe_refresh_layout);
        swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                viewModel.refresh();
            }
        });

Adapter Code

class DiscoverAdapter(private val action: (b: Int?) -> Unit)
    : PagedListAdapter<PostModel, RecyclerView.ViewHolder>(NewsDiffCallback) {

    private val DATA_VIEW_TYPE = 1
    private val FOOTER_VIEW_TYPE = 2

    private var state = State.LOADING

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        return if (viewType == DATA_VIEW_TYPE) DiscoverViewHolder.create(parent) else ListFooterViewHolder.create(parent)
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        if (getItemViewType(position) == DATA_VIEW_TYPE)
            (holder as DiscoverViewHolder).bind(action, getItem(position))
        else (holder as ListFooterViewHolder).bind(action, state)
    }

    override fun getItemViewType(position: Int): Int {
        return if (position < super.getItemCount()) DATA_VIEW_TYPE else FOOTER_VIEW_TYPE
    }

    companion object {
        val NewsDiffCallback = object : DiffUtil.ItemCallback<PostModel>() {
            override fun areItemsTheSame(oldItem: PostModel, newItem: PostModel): Boolean {
                return oldItem.id == newItem.id
            }

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

    override fun getItemCount(): Int {
        return super.getItemCount() + if (hasFooter()) 1 else 0
    }

    private fun hasFooter(): Boolean {
        return super.getItemCount() != 0 && (state == State.LOADING || state == State.ERROR)
    }

    fun setState(state: State) {
        this.state = state
        notifyItemChanged(super.getItemCount())
    }

    fun getData(position: Int): PostModel {
        return getItem(position) as PostModel
    }
}

View Holder 1 is items and another use for load more data

class DiscoverViewHolder(view: View) : RecyclerView.ViewHolder(view) {

    fun bind(retry: (x: Int?) -> Unit, postModel: PostModel?) {
        val width = DeviceScreenUtil.getInstance().width
        val newWidth = width / 3
        val layoutParams = itemView.rl_main_layout.getLayoutParams()
        layoutParams.height = Math.round(newWidth * 1.2f)
        layoutParams.width = Math.round(newWidth.toFloat())
        itemView.rl_main_layout.setPadding(3, 3, 4, 4)
        itemView.rl_main_layout.setLayoutParams(layoutParams)

        if (postModel != null) {
//            itemView.tv_total_like.text = news.title
            if (!postModel.thumbnail.isNullOrEmpty())
                Picasso.get().load(postModel.thumbnail).into(itemView.iv_image)
            itemView.setOnClickListener { retry(adapterPosition) }
            if (postModel.likes > 0) itemView.tv_total_like.setText(postModel.likes.toString() + "")
        }
    }

    companion object {
        fun create(parent: ViewGroup): DiscoverViewHolder {
            val view = LayoutInflater.from(parent.context)
                    .inflate(R.layout.item_myprofile, parent, false)
            return DiscoverViewHolder(view)
        }
    }
}

set adapter code

DiscoverAdapter discoverAdapter = DiscoverAdapter {
        if (it == null) {
            viewModel.retry()
        } else {
            click(it)
        }

    }
    rvPost.adapter = discoverAdapter
    viewModel.newsList.observe(this,
            Observer {
                discoverAdapter.submitList(it)
            })

invalidating datasource on refresh

Error Logs

java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 20(offset:20).state:21 androidx.recyclerview.widget.RecyclerView{ecd9c90 VFED..... .F....ID 0,0-704,1024 #7f08021d app:id/rvPost}, adapter:com.app.ui.main.dashboard.search.discover.adapter.DiscoverAdapter@a9fb989, layout:androidx.recyclerview.widget.GridLayoutManager@97fed8e, context:com.app.ui.main.dashboard.MainActivity@226aa34 at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6183) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114) at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303) at androidx.recyclerview.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:561) at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587) at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665) at androidx.recyclerview.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:170) at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:4085) at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3849) at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at androidx.swiperefreshlayout.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:625) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at com.google.android.material.appbar.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:148) at com.google.android.material.appbar.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:43) at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1892) at androidx.coordinatorlayout.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:918) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1915) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at com.google.android.material.appbar.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:148) at com.google.android.material.appbar.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:43) at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1892) at androidx.coordinatorlayout.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:918) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16651) at android.view.ViewGroup.layout(ViewGroup.java:5440) at androi

Answer 1

problem exist in recyclerview adapter i think you forget to adapte.rnotifyDataChanged() when set data again after refresh :)

plz print your adapter code