Блог

Я хочу, чтобы при прокрутке до моего списка загружалось больше данных с помощью volley, я создал веб-сервис PHP и результат

 {
    "error": false,
    "status_code": 200,
    "total_items": 2,
    "last_page": 1,
    "current_page": 1,
    "per_page": 10,
    "result": [
    {
        "id": 1,
        "title": "here title one",
        "city": "city",
        "zone": "zone",
        "type": "type",
        "service": "service",
        "space": "545",
        "date": "2016-08-28 12:24:34",
        "image": "http://localhost/my_cms/public/assets/media/ad-pic.png"
    }, {
        "id": 2,
        "title": "here title two",
        "city": "city",
        "zone": "zone",
        "type": "type",
        "service": "service",
        "space": "545",
        "date": "2016-08-28 12:24:34",
        "image": "http://localhost/my_cms/public/assets/media/ad-pic.png"
    }]
}
  

Моя недавняя активность.Класс Java

 public class RecentActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener, AbsListView.OnScrollListener {


    private SwipeRefreshLayout swipeRefreshLayout;

    // Log tag
    private static final String TAG = HomeActivity.class.getSimpleName();

    // RealstateDataModel json url
    private static final String homeAdsurl = "http://192.168.43.74/my_cms/public/api/realstate/latest?page=";
    private ProgressDialog pDialog;
    private List<RealstateDataModel> realstateData = new ArrayList<RealstateDataModel>();
    private ListView listView;
    private HomeListAdapter homaAdapter;
    int current_page = 0;
    boolean loading;
    RecentActivity activity = null;
    View loadMoreView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recent);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        listView = (ListView) findViewById(R.id.Recent_View);

        String home= getResources().getString(R.string.recient_offers);
        setTitle(home);

        activity = this;
        //List View
        setListAdapter();

        listView.setOnScrollListener(this);


    }

    public void setListAdapter(){
         swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_recent_layout);
        homaAdapter = new HomeListAdapter(this, realstateData);
        listView.setAdapter(homaAdapter);
        pDialog = new ProgressDialog(this);

        // Showing progress dialog before making http request
        pDialog.setMessage("Loading...");
        pDialog.setCancelable(false);
        pDialog.show();

        swipeRefreshLayout.setOnRefreshListener(this);

        /**
         * Showing Swipe Refresh animation on activity create
         * As animation won't start on onCreate, post runnable is used
         */
        swipeRefreshLayout.post(new Runnable() {
                                    @Override
                                    public void run() {
                                        swipeRefreshLayout.setRefreshing(true);

                                        fetchRealStateList();
                                    }
                                }
        );
    }



    @Override
    public void onRefresh() {
        // showing refresh animation before making http call
        swipeRefreshLayout.setRefreshing(true);
        fetchRealStateList();
    }

    private void fetchRealStateList() {
        // Creating volley request obj
        JsonObjectRequest homeListReq = new JsonObjectRequest(Request.Method.GET,
                homeAdsurl, null, new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                Log.d(TAG, response.toString());
                hidePDialog();
                if (response.length() > 0) {
                    try {
                        JSONArray ResultArray = response.getJSONArray("result");


                        if(realstateData!=null) {
                            realstateData.clear();
                        }

                        // Parsing json
                        for (int i = 0; i < ResultArray.length(); i  ) {
                            try {

                                JSONObject obj = ResultArray.getJSONObject(i);
                                RealstateDataModel realstateDataBeans = new RealstateDataModel();

                                realstateDataBeans.setTitle(obj.getString("title"));
                                realstateDataBeans.setCity(obj.getString("city"));
                                realstateDataBeans.setZone(obj.getString("zone"));
                                realstateDataBeans.setType(obj.getString("type"));
                                realstateDataBeans.setService(obj.getString("service"));
                                realstateDataBeans.setSpace(obj.getString("space"));
                                realstateDataBeans.setCreated_at(obj.getString("date"));
                                realstateDataBeans.setImage(obj.getString("image"));
                                // adding movie to movies array
                                realstateData.add(0,realstateDataBeans);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                    // notifying list adapter about data changes
                    // so that it renders the list view with updated data
                    homaAdapter.notifyDataSetChanged();
                }
                // stopping swipe refresh
                swipeRefreshLayout.setRefreshing(false);

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error: "   error.getMessage());
                hidePDialog();
                // stopping swipe refresh
                swipeRefreshLayout.setRefreshing(false);

            }
        });

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(homeListReq);
    }

    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        hidePDialog();
    }

    @Override
    public void onScrollStateChanged(AbsListView absListView, int i) {

    }

    @Override
    public void onScroll(AbsListView absListView, int i, int i1, int i2) {

    }
}
  

Он пытался и искал больше, но когда он пытается прокрутить, это не срабатывает, я делаю f
onScrollStateChanged и onScroll empty, чтобы заполнить его вашим полезным кодом

Например, сначала загрузите 10 элементов. Когда пользователь достигнет нижней части, загрузите еще 10 элементов. Как вы можете понять, что это дно?

 The last item's bottom == scroll position
  

означает конец списка. Загружайте больше.