Android: Listenansicht Last mehr mit Volley

Question

ich will, wenn ich mehr Daten auf meiner Liste Ansicht Last Volley nach oben verwenden, erstellt i PHP Webservice und

{ 
    "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" 
    }] 
} 

Meine RecentActivity.Java Klasse

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) { 

    } 
} 

führen

es versuchte und durchsuchte mehr, aber wenn es nicht versuchen, Einfluss zu blättern, den ich mache f onScrollStateChanged und OnScroll leer es Ihren hilfreichen Code

Answer 1

Für ex zu füllen reichlich 10 Stück zuerst laden. Wenn der Benutzer die untere Grenze erreicht, laden Sie 10 weitere Gegenstände. Wie kannst du verstehen, dass es unten ist?

The last item's bottom == scroll position 

bedeutet Ende der Liste. Mehr laden.