cachapa / ExpandableLayout расширяет несколько представлений одновременно

Question

Эта библиотека позволяет расширять и сворачивать представления. В настоящее время, если у меня уже есть развернутое представление, и я пытаюсь развернуть другое представление, первое сворачивается на это свое. Я хочу, чтобы несколько просмотров расширялись одновременно.

Activity_main. xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recc2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity. java:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RecyclerView recyclerView = findViewById(R.id.recc2);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(new SimpleAdapter(recyclerView,this));
    }
    private static class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.ViewHolder> {
        private static final int UNSELECTED = -1;
        private RecyclerView recyclerView;
        private Context context;
        private int selectedItem = UNSELECTED;

        SimpleAdapter(RecyclerView recyclerView, Context context) {
            this.context=context;
            this.recyclerView = recyclerView;
        }

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View itemView = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.recycler_item, parent, false);
            return new ViewHolder(itemView);
        }

        @Override
        public void onBindViewHolder(ViewHolder holder, int position) {
            holder.bind();
        }
        @Override
        public int getItemCount() {
            return 100;
        }
        public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, ExpandableLayout.OnExpansionUpdateListener {
            private ExpandableLayout expandableLayout;
            private TextView expandButton;
            private RecyclerView recyclerView4;
            public ViewHolder(View itemView) {
                super(itemView);
                expandableLayout = itemView.findViewById(R.id.expandable_layout);
                expandableLayout.setInterpolator(new OvershootInterpolator());
                expandButton = itemView.findViewById(R.id.expand_button);
                expandButton.setOnClickListener(this);
                recyclerView4=itemView.findViewById(R.id.recycler3);
            }

            public void bind() {
                int position = getAdapterPosition();
                boolean isSelected = position == selectedItem;
                expandButton.setText(position + ". Tap to expand");
                expandButton.setSelected(isSelected);
                expandableLayout.setExpanded(isSelected, false);
                Adapter_two adapter_two = new Adapter_two();
                LinearLayoutManager layoutManager = new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false);
                recyclerView4.setLayoutManager(layoutManager);
                recyclerView4.setAdapter(adapter_two);
            }

            @Override
            public void onClick(View view) {
                ViewHolder holder = (ViewHolder) recyclerView.findViewHolderForAdapterPosition(selectedItem);
                if (holder != null) {
                    holder.expandButton.setSelected(false);
                    holder.expandableLayout.collapse();
                }

                int position = getAdapterPosition();
                if (position == selectedItem) {
                    selectedItem = UNSELECTED;
                } else {
                    expandButton.setSelected(true);
                    expandableLayout.expand();
                    selectedItem = position;
                }
            }
            @Override
            public void onExpansionUpdate(float expansionFraction, int state) {
                Log.d("ExpandableLayout", "State: " + state);
                if (state == ExpandableLayout.State.EXPANDING) {
                    recyclerView.smoothScrollToPosition(getAdapterPosition());
                }
            }
        }
    }
}

адаптер два отвечает за заполнение 20 изображений в каждой строке. Adapter_two. java:

class Adapter_two extends RecyclerView.Adapter<Adapter_two.TwoHolder> {


    @NonNull
    @Override
    public TwoHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.viewholder_menuitem, parent, false);

        return new TwoHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull TwoHolder holder, int position) {
    }

    @Override
    public int getItemCount() {
        return 20;
    }

    class TwoHolder extends RecyclerView.ViewHolder {
        TwoHolder(@NonNull View itemView) {
            super(itemView);
        }
    }
}

recycler_item. xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <TextView
        android:id="@+id/expand_button"
        style="@style/TextAppearance.AppCompat.Medium"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:elevation="6dp"
        android:foreground="?selectableItemBackground"
        android:padding="16dp" />
    <net.cachapa.expandablelayout.ExpandableLayout
        android:id="@+id/expandable_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimaryDark"
        app:el_duration="300"
        app:el_expanded="true"
        >
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            />
    </net.cachapa.expandablelayout.ExpandableLayout>
</LinearLayout>