android - 将项目添加到 recyclerview 的顶部

Question

我的 Activity 中有一个 Recyclerview。当我下拉时，它将加载新项目以回收 View 。现在我需要执行 pull 以将概念刷新到我的 recyclerview。我已经做到了。但是当我调用拉动刷新时，我得到了新项目并添加到回收 View 底部。我需要将新项目添加到我的回收 View 顶部。如何将新加载的项目添加到回收站 View 的顶部。

 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();
}

Answer 1

我会坚持你在 0th 位置添加项目，它来自下拉刷新，如下所示，

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