Android选项卡片段搜索功能

Question

在一个带有三个选项卡且在工具栏上具有搜索功能的应用程序上工作，然后从SQLite提取数据并填充回收者视图中的数据，我也尝试向其添加搜索过滤器，但它在下面不起作用是我的代码。任何帮助将不胜感激下面是我的适配器代码和TabFragment过滤器

    private ArrayList<books> book = new ArrayList<>();
    private List<books> contactListFiltered;
    List<View>itemViewList = new ArrayList<>();
    private List<books> contactList;
    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, booker, time;

        public MyViewHolder(View view) {
            super(view);
            title = (TextView) view.findViewById(R.id.title);
            booker = (TextView) view.findViewById(R.id.body);
            time = (TextView) view.findViewById(R.id.time);

        }
    }


    public MoviesAdapter(List<books> book) {
        this.book = (ArrayList<books>) book;
    }

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

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        books movie = book.get(position);
        holder.title.setText(movie.getTitle());
        holder.booker.setText(movie.getBody());
        holder.time.setText(formatDate(books.getTimestamp()));
    }

    @Override
    public int getItemCount() {
        if (book == null)
            return 0;
        else
            return book.size();
    }

    private String formatDate(String dateStr) {
        try {
            SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Date date = fmt.parse(dateStr);
            SimpleDateFormat fmtOut = new SimpleDateFormat("MMM dd");
            return fmtOut.format(date);
        } catch (ParseException e) {

        }
        return "";
    }
    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence charSequence) {
                String charString = charSequence.toString();
                if (charString.isEmpty()) {
                    contactListFiltered = contactList;
                } else {
                    List<books> filteredList = new ArrayList<>();
                    for (books row : contactList) {

                        // name match condition. this might differ depending on your requirement
                        // here we are looking for name or phone number match
                        if (row.getBody().toLowerCase().contains(charString.toLowerCase())) {
                            filteredList.add(row);
                        }
                    }

                    contactListFiltered = filteredList;
                }

                FilterResults filterResults = new FilterResults();
                filterResults.values = contactListFiltered;
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
                contactListFiltered = (ArrayList<books>) filterResults.values;
                notifyDataSetChanged();
            }
        };
    }

这是我的Tab片段代码：

@Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.menu, menu);
        SearchManager searchManager = (SearchManager) getActivity().getSystemService(Context.SEARCH_SERVICE);
        searchView = (SearchView) menu.findItem(R.id.action_search)
                .getActionView();
        if (searchManager != null) {
            searchView.setSearchableInfo(searchManager
                    .getSearchableInfo(getActivity().getComponentName()));
        }
        searchView.setMaxWidth(Integer.MAX_VALUE);

        // listening to search query text change
        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                // filter recycler view when query submitted
                mAdapter.getFilter().filter(query);
             recyclerView.setAdapter(mAdapter);
             Toast.makeText(getContext(),"the search is on",Toast.LENGTH_LONG).show();

/// tell the recycler there is a different data to display
               mAdapter.notifyDataSetChanged();
                return false;
            }

            @Override
            public boolean onQueryTextChange(String query) {
                // filter recycler view when text is changed
                mAdapter.getFilter().filter(query);
               recyclerView.setAdapter(mAdapter);

/// tell the recycler there is a different data to display
               mAdapter.notifyDataSetChanged();
                return false;
            }
        });
    }