将项目添加到recyclerview的顶部 [英] Add Items to top of recyclerview

问题描述

我的活动中有一个Recyclerview.当我下拉时，它将加载新项目以回收视图. 现在，我需要实现拉动，以将概念刷新到我的recyclerview.我已经做到了.但是，当我调用pull刷新时，我得到了新的物品并添加到了回收视图的底部.我需要在回收视图的顶部添加新项目.如何将新加载的项目添加到回收者"视图的顶部.

I have a Recyclerview in my activity. when I pull down it will load new items to recycle view. Now I need to implement pull to refresh the concept to my recyclerview. I have done that. But when I call pull to refresh I am getting new items and added to recycle view bottom. I required to add new items to top of my recycle view. How can I add new loaded items to the top position of recycler view.

 public void refreshing() throws IllegalStateException{

    new AsyncTask<String, Void, Void>() {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            progressBar.setVisibility(View.VISIBLE);
        }

        @Override
        protected Void doInBackground(String... arg0) {
                final List<NameValuePair> list = new ArrayList<NameValuePair>();
                list.add(new BasicNameValuePair("id", sPreferences.getString("ID", "")));

                final HttpParams httpParams = new BasicHttpParams();
                HttpConnectionParams.setConnectionTimeout(httpParams, 30000);
                DefaultHttpClient httpClient = new DefaultHttpClient(httpParams);
                HttpPost httpPost = new HttpPost(Config.requestpatienthistory);
                httpPost.getParams().setBooleanParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, false);
                try {
                    httpPost.setEntity(new UrlEncodedFormEntity(list));
                } catch (IOException e) {
                    e.printStackTrace();
                }
                try {                       
                    HttpResponse response = httpClient.execute(httpPost);
                    BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
                    String json = reader.readLine();


                    JSONObject jsonObj = new JSONObject(json);
                    if (jsonObj.has("control")) {

                        JSONArray feedArray = jsonObj.getJSONArray("control");
                        for (int i = 0; i < feedArray.length(); i++) {
                            JSONObject feedObj = (JSONObject) feedArray.get(i);

                            final Historyitem item = new Historyitem();

                            if (feedObj.has("Reported_Time")) {                                 
                                  item.setReported_Time(feedObj.getString("Reported_Time"));                                
                            }
                            historyitems.add(item);
                        }
                    } else {
                        System.out.println("" + "no patients");
                    }
                } catch (SocketException e) {
                   e.printStackTrace();
                } catch (JSONException e) {
                    e.printStackTrace();
                } catch (NullPointerException e) {
                    e.printStackTrace();
                }catch (Exception e) {
                    e.printStackTrace();                    
                }             
            return null;
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            progressBar.setVisibility(View.GONE);
            historyadapter = new HistoryRecycleListAdapter(getActivity(), getActivity(), historyitems);
            hisrecyclerview.setAdapter(historyadapter);                                                
        }
    }.execute();
}

推荐答案

我会坚持要求您在0th位置添加项目，该位置来自拉动刷新，如下所示，

I would insist you to add item at 0th position which is coming from pull to refresh as below,

mArrayList.add(position, item);
notifyItemInserted(position); 

这篇关于将项目添加到recyclerview的顶部的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！