java - 无限滚动问题，向下滚动且 api 调用函数有效且列表位置转到第一项

Question

private StringRequest VolleyPostlogin(final int requestCount){

        System.out.println("MeeeHistoryServerResponseeNrequestCount "+requestCount);




        mSwipeRefreshLayout.setRefreshing(true);
        RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
        String URL = Constants.APP_URL+"get_history_new";

        final String mRequestBody = "{\"jsonrpc\": \"2.0\",\"params\":{\"page\":"+requestCount+"}}";
        System.out.println("HisResponseeNmRequestBody "+mRequestBody);
        //   final String mRequestBody = "{\"jsonrpc\": \"2.0\",\"params\":{}}";

        StringRequest stringRequest = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>() {
            @Override
            public void onResponse(String response) {
                Log.i("VOLLEY", response);

                System.out.println("HisResponseeNmRequestBody response "+response);

                try{

                    JSONObject mainObject = new JSONObject(response);
                    JSONObject result = mainObject.getJSONObject("result");
                    String status = result.getString("status");
                    if(status.equals("200")){
                        JSONArray Arrresponse = result.getJSONArray("response");

                        if(Arrresponse.length()>0) {
                            for (int i = 0; i < Arrresponse.length(); i++) {
                                try{
                                    JSONObject codeObject = Arrresponse.getJSONObject(i);
                                    System.out.println("Arrresponse "+codeObject);

                                    name.add(codeObject.getString("name"));


                                    try{
                                        SimpleDateFormat df = new SimpleDateFormat("dd MMM yyyy hh:mm a", Locale.ENGLISH);
                                        df.setTimeZone(TimeZone.getTimeZone("UTC"));
                                        Date date = df.parse(codeObject.getString("actual_start_date"));
                                        df.setTimeZone(TimeZone.getDefault());
                                        actual_start_date.add(df.format(date));

                                    }catch (Exception e){
                                        System.out.println("ArrresponseException "+e.toString());
                                        actual_start_date.add("");
                                    }


                                    try{
                                        SimpleDateFormat df = new SimpleDateFormat("dd MMM yyyy hh:mm a", Locale.ENGLISH);
                                        df.setTimeZone(TimeZone.getTimeZone("UTC"));
                                        Date date = df.parse(codeObject.getString("actual_stop_date"));
                                        df.setTimeZone(TimeZone.getDefault());
                                        actual_stop_date.add(df.format(date));

                                    }catch (Exception e){
                                        actual_stop_date.add("");
                                        System.out.println("ArrresponseException "+e.toString());
                                    }


                                    actual_duration.add(codeObject.getString("actual_duration"));

                                    try{
                                        SimpleDateFormat df = new SimpleDateFormat("dd MMM yyyy hh:mm a", Locale.ENGLISH);
                                        df.setTimeZone(TimeZone.getTimeZone("UTC"));
                                        Date date = df.parse(codeObject.getString("planned_start_date"));
                                        df.setTimeZone(TimeZone.getDefault());
                                        planned_start_date.add(df.format(date));

                                    }catch (Exception e){
                                        planned_start_date.add("");
                                        System.out.println("ArrresponseException "+e.toString());
                                    }

                                    try{
                                        SimpleDateFormat df = new SimpleDateFormat("dd MMM yyyy hh:mm a", Locale.ENGLISH);
                                        df.setTimeZone(TimeZone.getTimeZone("UTC"));
                                        Date date = df.parse(codeObject.getString("planned_stop_date"));
                                        df.setTimeZone(TimeZone.getDefault());
                                        planned_stop_date.add(df.format(date));

                                    }catch (Exception e){
                                        planned_stop_date.add("");
                                        System.out.println("ArrresponseException "+e.toString());
                                    }

                                    meeting_status.add(codeObject.getString("status"));
                                    latitude.add(codeObject.getString("planned_latitude"));
                                    longitude.add(codeObject.getString("planned_longitude"));
                                    meeting_id.add(codeObject.getString("id"));
                                    external_attentendees.add(codeObject.getString("partner_name"));
                                    internal_attentendees.add(codeObject.getString("attendees"));
                                    planned_duration.add(codeObject.getString("planned_duration"));
                                    show_as.add(codeObject.getString("show_as"));
                                    location.add(codeObject.getString("location"));
                                    Status.add(codeObject.getString("status"));
                                    tags.add(codeObject.getString("tags"));
                                    reminders.add(codeObject.getString("reminders"));
                                    description.add(codeObject.getString("description"));
                                    summary.add(codeObject.getString("summary"));
                                    mRecyclerView.setVisibility(View.VISIBLE);

                                    historyAdapter = new HistoryAdapter(name,actual_start_date,actual_stop_date,planned_start_date,planned_stop_date,latitude,longitude,meeting_status,meeting_id,external_attentendees,internal_attentendees,planned_duration,show_as,tags,reminders,description,actual_duration,Status,summary,location,mSwipeRefreshLayout,activity);
                                    mRecyclerView.setAdapter(historyAdapter);
//                                    progressBar.setVisibility(View.GONE);
                                    mSwipeRefreshLayout.setRefreshing(false);
                                    historyAdapter.notifyDataSetChanged();
                                    NoData.setVisibility(View.GONE);


                                    manager = new LinearLayoutManager(activity);
                                    mRecyclerView.setLayoutManager(manager);

                                    mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
                                        @Override
                                        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                                            super.onScrollStateChanged(recyclerView, newState);
                                            if(newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL)
                                            {
                                                isScrolling = true;
                                                Toast.makeText(getActivity(),"onScrollStateChanged " , Toast.LENGTH_LONG).show();

                                            }
                                        }

                                        @Override
                                        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                                            super.onScrolled(recyclerView, dx, dy);
                                            currentItems = manager.getChildCount();
                                            totalItems = manager.getItemCount();
                                            scrollOutItems = manager.findFirstVisibleItemPosition();
                                            System.out.println("NEWonScrolledmanager currentItems "+currentItems);
                                            System.out.println("NEWonScrolledmanager totalItems "+totalItems);
                                            System.out.println("NEWonScrolledmanager scrollOutItems "+scrollOutItems);


                                            if(isScrolling && (currentItems + scrollOutItems == totalItems))
                                            {
                                                Toast.makeText(getActivity(),"onScrolled " , Toast.LENGTH_LONG).show();
                                                isScrolling = false;
                                                getData();
                                            }


                                        }
                                    });

                                }catch (Exception e){

                                    Toast.makeText(getActivity(),"Something went wrong, please try again later" , Toast.LENGTH_LONG).show();
                                    System.out.println("ServerResponseExceptionCatch "+e.toString());

                                }
                            }

                        }else {
                            mSwipeRefreshLayout.setRefreshing(false);
                        }


                    }else {
                        NoData.setVisibility(View.VISIBLE);
                        mSwipeRefreshLayout.setRefreshing(false);
                    }

                }catch (Exception e){

                    Toast.makeText(getActivity(),"Something went wrong, please try again later" , Toast.LENGTH_LONG).show();
                    System.out.println("ServerResponseExceptionCatch "+e.toString());
//                    progressBar.setVisibility(View.GONE);
                }

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                try{
                    Log.e("VOLLEY", error.getLocalizedMessage());
                    mSwipeRefreshLayout.setRefreshing(false);
                    System.out.println("ServerResponse error"+error);
                    Toast.makeText(getActivity(),"Something went wrong, please try again later" , Toast.LENGTH_LONG).show();
//                   progressBar.setVisibility(View.GONE);
                }catch (Exception e){
                    System.out.println("ServerResponseException "+e.toString());
                    Toast.makeText(getActivity(),"Something went wrong, please try again later" , Toast.LENGTH_LONG).show();
                    System.out.println("ServerResponseExceptionCatch "+e.toString());
//                   progressBar.setVisibility(View.GONE);
                }


            }
        }) {
            @Override
            public String getBodyContentType() {
                return "application/json; charset=utf-8";
            }
            @Override
            public byte[] getBody() throws AuthFailureError {
                try {
                    return mRequestBody == null ? null : mRequestBody.getBytes("utf-8");
                } catch (UnsupportedEncodingException uee) {
                    VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s",
                            mRequestBody, "utf-8");
                    return null;
                }

            }

            @Override
            public Map<String, String> getHeaders() throws AuthFailureError {
                System.out.println("ConstantsSessionId "+Constants.SessionId);
                Map<String, String> params = new HashMap<String, String>();
                params.put("Content-Type", "application/json");
                params.put("X-Openerp-Session-Id", Constants.SessionId);
                return params;
            }

        };

        requestQueue.add(stringRequest);
        return stringRequest;
    }

当我向下滚动 api 调用时，我在项目中使用 android volley 进行无限滚动，并且它不会恢复到我上次看到的列表位置，它会转到列表顶部。这是我无限滚动的完整代码，我的问题是当我尝试向下滚动并调用 API 时，列表将直接转到顶部，而不是停留在 API 调用发生的最后位置，我尝试了很多方法来解决这个问题但它不起作用。请有人帮我解决这个问题。

提前致谢。

Answer 1

您想要实现的目标称为“分页”。

你的做法是错误的。

关注this tutorial

你会完成它的。

并且不要在 Activity 或 fragment 中实现网络调用或适配器。为此创建新的类。它将使您的代码更具可读性且易于跟踪。检查 Android 中的 MVP 模式。