SearchView for RecyclView不工作

Question

我已经在片段中为回收视图实现了搜索视图过滤器，如下所示，但是当我在searchview中输入查询时，没有任何反应。

我的片段类:DiscussionForum.java

public class DiscussionForum extends Fragment implements ForumAdapter.ForumAdapterListener {


private TextView socname;
private EditText messageinput;
private SearchView search;
// SearchView searchView;
private FloatingActionButton messagesend;
ProgressDialog progressDialog;
private static final String TAG = "Discussion Forum";
private RecyclerView recyclerView;
private List<ForumData> forumlist;
private ForumAdapter mAdapter;
private OnFragmentInteractionListener mListener;
private LinearLayout list;
private String sendurl, geturl;

public DiscussionForum() {
    // Required empty public constructor
}


public static DiscussionForum newInstance(String param1, String param2) {
    DiscussionForum fragment = new DiscussionForum();
    Bundle args = new Bundle();
    args.putString(ARG_PARAM1, param1);
    args.putString(ARG_PARAM2, param2);
    fragment.setArguments(args);
    return fragment;
}

@Override

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {      
    View view = inflater.inflate(R.layout.fragment_discussion_forum, container, false);
    onButtonPressed("Discussion Forum");      
    forumlist = new ArrayList<>();
    recyclerView = view.findViewById(R.id.listviewforum);
    list = view.findViewById(R.id.list);
    search = view.findViewById(R.id.search);
    int resId = R.anim.layout_animation_fall_down;
    LayoutAnimationController animation = AnimationUtils.loadLayoutAnimation(getContext(), resId);
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getContext());
    recyclerView.setLayoutManager(mLayoutManager);
    recyclerView.setLayoutAnimation(animation);
    mAdapter = new ForumAdapter(getContext(), forumlist, this);
    progressDialog = new ProgressDialog(getContext());
    progressDialog.setCancelable(false);        
    geturl = "";         
    fetchforumdata(getActivity().getIntent().getStringExtra("id"));
    search.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            mAdapter.getFilter().filter(newText);
            return true;
        }
    });

    return view;
}



private void fetchforumdata(final String id1) {
    progressDialog.setMessage("Loading...");
    showDialog();
    StringRequest request = new StringRequest(Request.Method.GET,
            geturl + id1,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    // Log.d("tag2","id"+id1);
                    Log.d(TAG, "Response Prop: " + response.toString());
                    hideDialog();
                    try {
                        JSONObject jObj = new JSONObject(response);
                        boolean error = jObj.getBoolean("errors");
                        if (!error) {
                            JSONObject dataobj = jObj.getJSONObject("data");
                            JSONArray ticketarray = dataobj.getJSONArray("result");
                            if (ticketarray.length() == 0) {
                                list.setVisibility(View.VISIBLE);
                            } else {
                                recyclerView.setVisibility(View.VISIBLE);
                                List<ForumData> items = new Gson().fromJson(ticketarray.toString(), new TypeToken<List<ForumData>>() {
                                }.getType());

                                forumlist.clear();
                                forumlist.addAll(items);
                                recyclerView.setAdapter(mAdapter);
                            }
                        } else {
                            // String errorMsg = jObj.getString("error_msg");
                            Toast.makeText(getContext(),
                                    "Try again or report an issue", Toast.LENGTH_LONG).show();
                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            // error in getting json
            Log.e(TAG, "Error: " + error.getMessage());
            Toast.makeText(getContext(), "Error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
            hideDialog();
        }
    });

    MyApplication.getInstance().addToRequestQueue(request);
}


// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(String title) {
    if (mListener != null) {
        mListener.onFragmentInteraction(title);
    }
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    if (context instanceof OnFragmentInteractionListener) {
        mListener = (OnFragmentInteractionListener) context;
    } else {
        throw new RuntimeException(context.toString()
                + " must implement OnFragmentInteractionListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

private void showDialog() {
    if (!progressDialog.isShowing())
        progressDialog.show();
}

private void hideDialog() {
    if (progressDialog.isShowing())
        progressDialog.dismiss();
}

@Override
public void onDocumentSelected(String id) {

}

public interface OnFragmentInteractionListener {
    // TODO: Update argument type and name
    void onFragmentInteraction(String title);
}}

我的适配器类:ForumAdapter < br >

public class ForumAdapter extends RecyclerView.Adapter<ForumAdapter.MyViewHolder> implements Filterable {
private Context context;
private List<ForumData> ticketlist;
private List<ForumData> filterlist;
private ForumAdapterListener listener;




public class MyViewHolder extends RecyclerView.ViewHolder {
    TextView username,createdat,forummessage,flatno,category,likes,subcount;
    ImageView edit;

    public MyViewHolder(View view) {
        super(view);
        username=view.findViewById(R.id.user_name2);
        createdat=view.findViewById(R.id.date2);
        edit = view.findViewById(R.id.profile_icon2);
        forummessage=view.findViewById(R.id.forum_message);
        flatno=view.findViewById(R.id.flat_no);
        category=view.findViewById(R.id.category);
        likes=view.findViewById(R.id.likes_data);
        subcount=view.findViewById(R.id.count_data);

    }
}
public ForumAdapter(Context context, List<ForumData> ticketlist, ForumAdapterListener listener) {
    this.context = context;
    this.listener = listener;
    this.ticketlist = ticketlist;
    this.filterlist=ticketlist;
}

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

    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder( ForumAdapter.MyViewHolder holder, int position) {
    final ForumData contact = ticketlist.get(position);
    holder.username.setText(contact.getUsername());
    holder.flatno.setText(contact.getFlattitle());
    holder.forummessage.setText(contact.getMessage());
    holder.createdat.setText(contact.getCreated_at());
    holder.category.setText(contact.getCategory());      
    holder.likes.setText(contact.getLikes());       
    holder.subcount.setText(contact.getSubcount());
    Glide.with(context)
            .load(url+".jpg")
            .apply(new RequestOptions().circleCrop().placeholder(R.drawable.man).error(R.drawable.man))
            .into(holder.edit);

        }
    });

}

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


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

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

                filterlist = filteredList;
            }

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

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            filterlist = (ArrayList<ForumData>) results.values;
            notifyDataSetChanged();

        }
    }
     ;
}
public interface ForumAdapterListener {
    void onDocumentSelected(String contact);
}}

我已经经历了许多解决方案，例如这里，这里，这里
但是我无法弄清楚我的代码出了什么问题。请帮我找出确切的问题所在。

Answer 1

另一种方法是在onQueryTextChange中过滤数据并刷新回收器视图的适配器：

searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String query) {


    }

    @Override
    public boolean onQueryTextChange(String newText) {
         ArrayList< ForumData > filteredData = new ArrayList<>();

        for (ForumData forumData : data) {
            if (forumData..getUsername().toLowerCase().contains(newText.toLowerCase())) {

                filteredData.add(forumData);

            }

        }

        adapter = new ForumAdapter(data, getContext() , this);
        recyclerView.setAdapter(adapter);
        return true ;

    }
})

Answer 2

您的适配器实现存在多个问题。如果我对您的代码理解正确的话，您希望保留对未过滤项目列表的引用

首先，您希望在屏幕上显示过滤器列表，因此在onBindViewHolder（）和getItemCount（）中，您需要使用过滤器列表而不是票证列表。

其次，您要确保ticketlist保持不变，以便所有未来的搜索都在相同的内容上。为此，您必须将所有filterlist=ticketlist；替换为filterlist=new ArrayList

这至少应该使您的代码能够正常工作。我建议你观看这个关于Java和对象以及引用的视频。