Question

我正在使用recyclerview来显示片段上的项目。我已经使用addtextchangedlistener在我的应用中实现了searh功能。当我要在edittext中输入文字时，recycler视图中的所有项目都会消失，我无法获得过滤结果。这是我的addtextchangedlistener

的代码

private void addTextListener() {
        search.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                 s=s.toString().toLowerCase();
                 final ArrayList<CurrentEntry> filter=new ArrayList<>();
                 for(int i=0;i<filter.size();i++)
                 {
                     final  String text=current.get(i).toString().toLowerCase();
                     if(text.contains(s))
                     {
                         filter.add(current.get(i));
                     }

                 }
                 recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
                 adapt=new NewAdapter(filter,getActivity());
                 recyclerView.setAdapter(adapt);
                 adapt.notifyDataSetChanged();
            }

            @Override
            public void afterTextChanged(Editable s) {
                //filter(s.toString());
            }
        });
    }

这是我的jsonrequest使用volley

private void getData() {
        String json_req = "json_req";
        String url =getContext().getString(R.string.CURRENT_STATUS);


        JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, url, null,
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                       try
                       {

                           JSONObject object=new JSONObject(response.toString());
                           JSONArray data=object.getJSONArray("results");
                           for(int i=0;i<data.length();i++)
                           {
                               JSONObject json = data.getJSONObject(i);
                             final   CurrentEntry c=new CurrentEntry();
                               userUrl=json.getString("name");
                               JsonObjectRequest request=new JsonObjectRequest(Request.Method.GET, userUrl, null, new Response.Listener<JSONObject>() {
                                   @Override
                                   public void onResponse(JSONObject response) {
                                       try {
                                           String foodie_name=response.getString("username");
                                           c.setName(name);
                                       } catch (JSONException e) {
                                           e.printStackTrace();
                                       }
                                       adapt.notifyDataSetChanged();
                                   }
                               }, new Response.ErrorListener() {
                                   @Override
                                   public void onErrorResponse(VolleyError error) {

                                   }
                               }
                               )

                               {
                                   @Override
                                   public Map<String, String> getHeaders() throws AuthFailureError {
                                       Map<String, String> headers = new HashMap<>();
                                       String credentials = ""+":"+"";
                                       String auth = "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
                                       headers.put("Content-type", "application/json");
                                       headers.put("Authorization", auth);
                                       return headers;
                                   }
                               };
                               AppController.getInstance().addToRequestQueue(request,second_req);
                               c.setPeople(json.getString("my_people"));
                               String temp=json.getString("my_timetime");
                               temp=temp.substring(11);
                               temp=temp.substring(0,temp.length()-4);
                               c.setEstimate(temp);
                               current.add(c);

                            }

                           recyclerView.setAdapter(adapt);
                           adapt.notifyDataSetChanged();
                       }
                       catch (JSONException e)
                       {

                       }

                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                    }

                })
        {
            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                Map<String, String> headers = new HashMap<>();
                String credentials = ""+":"+"";
                String auth = "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
                headers.put("Content-type", "application/json");
                headers.put("Authorization", auth);
                return headers;
            }
        };

        AppController.getInstance().addToRequestQueue(req, json_req);
    }

如何解决这个问题，以便在recyclerview中获得过滤结果。

Answer 1

删除此代码

adapt=new NewAdapter(filter,getActivity());
recyclerView.setAdapter(adapt);
adapt.notifyDataSetChanged();

每次更改文本时都不需要创建NewAdapter。相反，尝试更改适配器列表的值并调用notifyDataSetChanged（），如下所示。

adapt.filter=filter;
adapt.notifyDataSetChanged();

并在onCreate（）

中添加这些行

recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
adapt=new NewAdapter(filter,getActivity());
recyclerView.setAdapter(adapt);

Answer 2

在您的代码中，您一次又一次地调用以下代码;

recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
adapt=new NewAdapter(data,getActivity());
recyclerView.setAdapter(adapt);
adapt.notifyDataSetChanged();

只需在片段的onCreateView中编写此代码一次：

recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
adapt=new NewAdapter(data,getActivity());
recyclerView.setAdapter(adapt);

现在，在您的适配器类中，您需要拥有一个数据设置器，可用于设置您在API中根据视图中的搜索过滤器获取的更新数据。并发布您只需要调用adapt.notifyDataSetChanged（）：

adapt.setNewData(data);
adapt.notifyDataSetChanged();

如何实现onTextChangedListenerItem来搜索RecyclerView中的项目

2 个答案: