Inconsistency detected in RecyclerView, How to change contents of RecyclerView while scrolling

Question

I'm using RecyclerView to display name of the items. My row contains single TextView. Item names are stored in List<String> mItemList.

To change contents of RecyclerView, I replace Strings in mItemList and call notifyDataSetChanged() on RecyclerViewAdapter.

But If I try to change contents of the mItemList while RecyclerView is scrolling, sometimes it gives me java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 157(offset:157).state:588

This happens if size of mItemList is less than before. So what is the correct way to change contents of the RecyclerView ? Is this a bug in RecyclerView ?

Here's full stack trace of Exception:

java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 157(offset:157).state:588
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3300)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3258)
        at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1803)
        at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1302)
        at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1265)
        at android.support.v7.widget.LinearLayoutManager.scrollBy(LinearLayoutManager.java:1093)
        at android.support.v7.widget.LinearLayoutManager.scrollVerticallyBy(LinearLayoutManager.java:956)
        at android.support.v7.widget.RecyclerView$ViewFlinger.run(RecyclerView.java:2715)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
        at android.view.Choreographer.doCallbacks(Choreographer.java:555)
        at android.view.Choreographer.doFrame(Choreographer.java:524)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
        at android.os.Handler.handleCallback(Handler.java:615)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4921)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
        at dalvik.system.NativeStart.main(Native Method)

AdapterView code:

private static class FileListAdapter extends RecyclerView.Adapter<FileHolder> {
    private final Context mContext;
    private final SparseBooleanArray mSelectedArray;
    private final List<String> mList;

    FileListAdapter(Context context, List<String> list, SparseBooleanArray selectedArray) {
        mList = list;
        mContext = context;
        mSelectedArray = selectedArray;
    }


    @Override
    public FileHolder onCreateViewHolder(ViewGroup viewGroup, int i) {

        View view = LayoutInflater.from(viewGroup.getContext()).inflate(
                R.layout.file_list_item, viewGroup, false);

        TextView tv = (TextView) view
                .findViewById(R.id.file_name_text);
        Typeface font = Typeface.createFromAsset(viewGroup.getContext().getAssets(),
                viewGroup.getContext().getString(R.string.roboto_regular));
        tv.setTypeface(font);

        return new FileHolder(view, tv);
    }

    @Override
    public void onBindViewHolder(FileHolder fileHolder, final int i) {

        String name = mList.get(i);

        // highlight view if selected
        setSelected(fileHolder.itemView, mSelectedArray.get(i));

        // Set text
        fileHolder.mTextView.setText(name);
    }

    @Override
    public int getItemCount() {
        return mList.size();
    }
}

private static class FileHolder extends RecyclerView.ViewHolder {

    public final TextView mTextView;

    public FileHolder(View itemView, TextView tv) {
        super(itemView);
        mTextView = tv;
    }
}

Answer 1

Edit: The bug is fixed now, if you're still getting the same Exception, please make sure you're updating your Adapter data source only from the main thread and calling appropriate adapter notify method after it.

Old answer: It seems to be a bug in RecyclerView, it's reported here and here. Hopefully it will be fixed in the next release.

Answer 2

No problem for me. Use NotifyDataSetChanged();

public class MyFragment extends Fragment{

    private MyAdapter adapter;

    // Your code

    public void addArticle(){
        ArrayList<Article> list = new ArrayList<Article>();
        //Add one article in this list

        adapter.addArticleFirst(list); // or adapter.addArticleLast(list);
    }
}

public class ArticleAdapterRecycler extends RecyclerView.Adapter<ArticleAdapterRecycler.ViewHolder> {

    private ArrayList<Article> Articles = new ArrayList<Article>();
    private Context context;


    // Some functions from RecyclerView.Adapter<ArticleAdapterRecycler.ViewHolder>    

    // Add at the top of the list.

    public void addArticleFirst(ArrayList<Article> list) {
        Articles.addAll(0, list);
        notifyDataSetChanged();
    }

    // Add at the end of the list.

    public void addArticleLast(ArrayList<Article> list) {
        Articles.addAll(Articles.size(), list);
        notifyDataSetChanged();
    }
}