android回收视图选择跟踪器动态数据

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<MyData> dataList;
    private SelectionTracker<Long> selectionTracker;

    public MyAdapter(List<MyData> dataList) {
        this.dataList = dataList;
        this.selectionTracker = new SelectionTracker.Builder<>(
                "my-selection-id",
                recyclerView,
                StableIdKeyProvider(recyclerView),
                MyItemDetailsLookup(recyclerView),
                StorageStrategy.createLongStorage())
            .withSelectionPredicate(SelectionPredicates.createSelectAnything())
            .build();
    }

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        MyData data = dataList.get(position);
        holder.bind(data, selectionTracker.isSelected(position));
    }

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

    static class ViewHolder extends RecyclerView.ViewHolder {
        private TextView textView;

        ViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text_view);
        }

        void bind(MyData data, boolean isSelected) {
            textView.setText(data.getText());
            itemView.setSelected(isSelected);
        }
    }

    private static class StableIdKeyProvider extends RecyclerView.AdapterDataObserver implements KeyProvider<Long> {
        private final RecyclerView recyclerView;

        StableIdKeyProvider(RecyclerView recyclerView) {
            this.recyclerView = recyclerView;
            recyclerView.getAdapter().registerAdapterDataObserver(this);
        }

        @Override
        public long getKey(int position) {
            return recyclerView.getAdapter().getItemId(position);
        }
    }

    private static class MyItemDetailsLookup extends ItemDetailsLookup<Long> {
        private final RecyclerView recyclerView;

        MyItemDetailsLookup(RecyclerView recyclerView) {
            this.recyclerView = recyclerView;
        }

        @Nullable
        @Override
        public ItemDetails<Long> getItemDetails(@NonNull MotionEvent e) {
            View view = recyclerView.findChildViewUnder(e.getX(), e.getY());
            if (view != null) {
                RecyclerView.ViewHolder viewHolder = recyclerView.getChildViewHolder(view);
                return new MyItemDetails(viewHolder.getAdapterPosition());
            }
            return null;
        }
    }

    private static class MyItemDetails extends ItemDetailsLookup.ItemDetails<Long> {
        private final int position;

        MyItemDetails(int position) {
            this.position = position;
        }

        @Override
        public int getPosition() {
            return position;
        }

        @Nullable
        @Override
        public Long getSelectionKey() {
            return recyclerView.getAdapter().getItemId(position);
        }
    }
}