私はそれが常により多くの同じデータを読み込むときにスクロールする？

Question

誰も助けてくれますか？私はこのコードを使用しようとするとAsyntask.iを使用して上下スクロールするときに多くのデータをロードしたいが、それ以外の10個のデータだけをロードすると、それ以外に同じデータが表示されます。新しいデータはロードされません。 は、ここに私のコード：

 


    @Nullable 
     @Override 
     public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) { 
      view = inflater.inflate(R.layout.home_fragment, container, false); 
      arraylist1 = new ArrayList(); 
      adapter = new ListViewAdapter(view.getContext(), R.layout.list_view_adapter, arraylist1); 
      listOfNews = (ListView) view.findViewById(R.id.listView); 


      //progress bar 
      dialog = new ProgressDialog(HotNewsFrag.this.getActivity()); 
      dialog.setMessage("Loading News"); 
      dialog.setCancelable(true); 

      //class to parse data from json 
      new ReadJSON().execute(url); 


      return view; 
     } 

アダプタ

 


    public class ListViewAdapter extends ArrayAdapter { 
     private final LayoutInflater mInflater; 
     Context context; 
     ArrayList arrayList; 
     ImageView image; 
     TextView doer; 
     TextView date; 
     TextView text; 
     Days day = new Days(); 
     public ListViewAdapter(Context context, int resource, ArrayList arrayList) { 
      super(context, resource,arrayList); 
      mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      this.arrayList = arrayList; 
      this.context = context; 
     } 
     @Override 
     public int getCount() { 
      if(arrayList==null){ 
       return 0; 
      } 
      return arrayList.size(); 
     } 

     @Override 
     public long getItemId(int position) { 
      return position; 
     } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     final HotNews news; 
     View v = convertView; 

     if (v==null) { 
      v = mInflater.inflate(R.layout.list_view_adapter, parent, false); 
     } 
     image = (ImageView) v.findViewById(R.id.imagetitle); 
     title = (TextView) v.findViewById(R.id.txtTitle); 
     doer = (TextView) v.findViewById(R.id.doer); 
     date = (TextView) v.findViewById(R.id.txtdate); 
     text = (TextView) v.findViewById(R.id.text); 

     news = getItem(position); 
     Picasso.with(getContext()).load(url + news.getImage()).error(R.drawable.dap).noFade().into(image); 

     title.setText(news.getTitle()); 
     doer.setText("ព័ត៍មានដោយ៖"+news.getDoer()); 
     date.setText(day.Days(news.getDate())+":"+news.getTime()); 
     text.setText(news.getContent()); 

     //set onItemListener 
     listOfNews.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView parent, View view, int position, long id) { 
       Toast.makeText(getContext(), "Stop Clicking me", Toast.LENGTH_SHORT).show(); 
       Intent detail= new Intent(getContext(),HotNewsDetail.class); 
        detail.putExtra(newsid,String.valueOf(getItem(position).getId())); 
       startActivity(detail); 

      } 
     }); 
     listOfNews.setOnScrollListener(new AbsListView.OnScrollListener() { 

       @Override 
       public void onScrollStateChanged(AbsListView view, int scrollState) { 
        if (scrollState == 0) { 
         // new loadMoreListView().execute(); 

        } 

       } 

       @Override 
       public void onScroll(AbsListView view, int firstVisibleItem, 
            int visibleItemCount, int totalItemCount) { 
        final int lastItem = firstVisibleItem + visibleItemCount; 
        if (lastItem == totalItemCount) { 
         new ReadJSON().execute(url); 
        } else { 

        } 

       } 
      }); 


     return v; 
    } 

} 

ReadJSON

private class ReadJSON extends AsyncTask<String,Integer,String>{ 

     @Override 
     protected String doInBackground(String... url) { 
      String st = readURL(url[0]); 
      Log.d("st", st); 
      return st; 
     } 



     @Override 
     protected void onPostExecute(String content) { 

      try { 
       JSONObject jsonObject = new JSONObject(content); 
       JSONArray jsonArray = jsonObject.optJSONArray("data"); 
       for (int i = 0; i < jsonArray.length(); i++) { 

        Log.d(i + ":jsonArray object", jsonArray.toString() + " size= " + jsonArray.length()); 
        JSONObject productObject = jsonArray.optJSONObject(i); 
        JSONObject img = productObject.optJSONObject("image"); 
        if (img != null) { 
         JSONObject da = img.optJSONObject("data"); 
         if (da != null) { 
          arraylist1.add(new HotNews(
            da.optString("filename"), 
            productObject.optString("title"), 
            productObject.optString("article_by"), 
            productObject.optString("date_publish"), 
            productObject.optString("short_description"), 
            productObject.optInt("id"), 
            productObject.optString("time_publish") 
          )); 


          Log.d("jsonArray news list1", arraylist1.size() + ""); 

         } 

        }else { 
         arraylist1.add(new HotNews(
           "", 
           productObject.optString("title"), 
           productObject.optString("article_by"), 
           productObject.optString("date_publish"), 
           productObject.optString("short_description"), 
           productObject.optInt("id"), 
           productObject.optString("time_publish") 

         )); 
        } 
       } 
       listOfNews.setAdapter(adapter); 
       adapter.notifyDataSetChanged(); 
       dialog.dismiss(); 

       // super.onPostExecute(content); 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 








     } 
     @Override 
     protected void onPreExecute() { 
      dialog.show(); 
      super.onPreExecute(); 
     } 
    } 

Answer 1

あなたは正しくAsyncTaskのonPostExecute方法で、アダプタを更新しましたか？ 正確な動作を知るために、ReadJSON AsyncTaskの実装が見つかりませんでした。