Как обновить представление списка в SwipetoRefresh в Android?

Question

У меня есть listview, в котором метод onCreate Я запускаю URL-адрес, который дает мне список приложений, которые я показываю в Listview. Что я хочу, когда я использую swipe для обновления. Я хочу очистить все элементы списка List и снова выполнить этот URL-адрес и выборку Ответ в Listview.How я могу это сделать ..

Вот мой код: -

@Nullable 
@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    m_Main = inflater.inflate(R.layout.deal_listing, container, false);//intialize mainLayout 
    new CDealDataSent().execute(m_DealListingURL);// execute Url to fetch Deal list from serevr. 
} 
private void init() {// initialize controls 

    mSwipeRefresh = (SwipeRefreshLayout) m_Main.findViewById(R.id.activity_main_swipe_refresh_layout); 
    mSwipeRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
     @Override 
     public void onRefresh() { 
      // here I want to clear all items in listview and again execute That Url and fetech new DATA/.. 
     } 
    }); 
    m_ListView = (ListView) m_Main.findViewById(R.id.dealList);// findind Id of Listview 


} 

@SuppressWarnings("deprecation") 
private String DealListing(String url) {// this method POST details of user to server 
    InputStream inputStream; 
    try { 
     // 1. create HttpClient 
     HttpClient httpclient = new DefaultHttpClient(); 
     // 2. make POST request to the given URL 
     HttpPost httpPost = new HttpPost(url); 
     String json; 
     // 3. build jsonObject 
     JSONObject jsonObject = new JSONObject();// making object of Jsons. 
     jsonObject.put("agentCode", m_szMobileNumber);// put mobile number 
     jsonObject.put("pin", m_szEncryptedPassword);// put password 
     jsonObject.put("recordcount", sz_RecordCount);// put record count 
     jsonObject.put("lastcountvalue", sz_LastCount);// put last count 
     // 4. convert JSONObject to JSON to String 
     json = jsonObject.toString();// convert Json object to string 
     if (BuildConfig.klogInfo)// print json request to server 
      Log.d(TAG, "Server Request:-" + json); 
     // 5. set json to StringEntity 
     StringEntity se = new StringEntity(json); 
     // 6. set httpPost Entity 
     httpPost.setEntity(se); 
     // 7. Set some headers to inform server about the type of the content 
     httpPost.setHeader("Content-type", "application/json"); 
     // 8. Execute POST request to the given URL 
     HttpResponse httpResponse = httpclient.execute(httpPost); 
     HttpEntity entity = httpResponse.getEntity(); 
     // 9. receive response as inputStream 
     inputStream = entity.getContent(); 
     if (BuildConfig.klogInfo) 
      Log.d(TAG, "InputStream:-" + inputStream.toString()); 
     Log.d(TAG, "Response:-" + httpResponse.toString()); 

     StatusLine statusLine = httpResponse.getStatusLine(); 
     if (BuildConfig.klogInfo) {// print server status line code 
      Log.d(TAG, "Status Code:-" + statusLine); 
     } 
     ////Log.d("resp_body", resp_body.toString()); 
     int statusCode = statusLine.getStatusCode(); 
     // 10. convert inputstream to string 
     if (statusCode == 200) { 
      // 10. convert inputstream to string 
      s_szresult = CJsonsResponse.convertInputStreamToString(inputStream); 
      if (BuildConfig.klogInfo)// print server response 
       Log.d(TAG, "Server Response:-" + s_szresult); 
     } else 
      s_szresult = "Did not work!"; 
    } catch (Exception e) { 
     Log.d("InputStream", e.getLocalizedMessage()); 
    } 
    Log.d(TAG, "Response Password:" + m_szEncryptedPassword); 
    Log.d(TAG, "Record Count:" + sz_RecordCount); 
    Log.d(TAG, "Last count:-" + sz_LastCount); 
    // 11. return s_szResult 
    return s_szresult; 
} 

@SuppressWarnings("StatementWithEmptyBody") 
private void getResponse() throws JSONException {// getting response from serevr .................. 
    if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Connection Not Available")) {//server based conditions 
     CSnackBar.getInstance().showSnackBarError(m_Main.findViewById(R.id.mainLayout), "Connection Lost !", getActivity()); 
    } else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Deal List Not Found")) {// serevr based conditions ..... 
     CSnackBar.getInstance().showSnackBarError(m_Main.findViewById(R.id.mainLayout), "No more deals available", getActivity()); 

    } 
} 

// sending deal data to server and retreive Deal list...... 
class CDealDataSent extends AsyncTask<String, Void, String> { 
    public CDealAppDatastorage item;// declaring DealAppdataStorage 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     m_ProgressView.setVisibility(View.VISIBLE);// make rogressview Visible while doing background process 
    } 

    @Override 
    protected String doInBackground(String... urls) { 
     return DealListing(urls[0]);// sending data to server... 

    } 

    // onPostExecute displays the results of the AsyncTask. 
    @SuppressWarnings("deprecation") 
    @SuppressLint("SetTextI18n") 
    @Override 
    protected void onPostExecute(final String result) {// this method Update UI 

     m_ProgressView.setVisibility(View.GONE);// make progressview Gone when background process completes... 
     mSwipeRefresh.setRefreshing(false); 
     try { 
      m_oResponseobject = new JSONObject(result);// getting response from server 
      JSONArray posts = m_oResponseobject.optJSONArray("dealList");// get Deal list in array from response 


      for (int i = 0; i < posts.length(); i++) {// loop for counting deals from server 
       JSONObject post = posts.getJSONObject(i);// counting deal based on index 
       item = new CDealAppDatastorage();// creating object of DealAppdata storage 
       item.setM_szHeaderText(post.getString("dealname"));// get deal name from response 
       item.setM_szsubHeaderText(post.getString("dealcode"));// get dealcode from response 
       item.setM_szDealValue(post.getString("dealvalue"));// get deal value from response 
       item.setM_n_Image(m_n_FormImage[i]);//set Image Index wise(Dummy) 
       s_oDataset.add(item);// add all items in ArrayList 

      } 
      if (!hasLoadMore) { 
       // LoadMore button 
       btnLoadMore = new Button(getActivity());// creating button 
       btnLoadMore.setText("LOAD MORE DEALS");// set Text in Button 
       btnLoadMore.setBackgroundResource(R.drawable.button_boarder);// set Background Resource 
       btnLoadMore.setTextAppearance(getActivity(), android.R.style.TextAppearance_DeviceDefault_Small);// setting Text appearence of button text 
       btnLoadMore.setTextColor(Color.WHITE);// set Color of button text 
       btnLoadMore.setGravity(Gravity.CENTER);// set Gravity of button text 
       hasLoadMore=true; 
      } 
      if (!s_oDataset.isEmpty()) {// condition if data in arraylist is not empty 
       // Adding Load More button to lisview at bottom 
       m_ListView.addFooterView(btnLoadMore);// add footer in listview 
       m_oAdapter = new CDealAppListingAdapter(getActivity(), s_oDataset);// create adapter object and add arraylist to adapter 
       m_ListView.setAdapter(m_oAdapter);//adding adapter to recyclerview 
       m_oAdapter.notifyDataSetChanged();// notify adapter about changes in List 
      } else { 
       btnLoadMore.setVisibility(View.GONE);// else Load buttonvisibility set to Gone 
      } 
      btnLoadMore.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) {// load more button onclick listener 
        m_n_DefaultRecordCount = 5;// increment of record count by 5 on next load data 
        m_n_DeafalutLastCount = m_n_DeafalutLastCount + 5;// same here.....as above 

        sz_RecordCount = String.valueOf(m_n_DefaultRecordCount);// convert int value to string 
        sz_LastCount = String.valueOf(m_n_DeafalutLastCount);// convert int value to string ///// 
        new DealNext().execute(m_DealListingURL);// POST DATA TO SERVER TO LOAD MORE DATA...... 
       } 
      }); 

      getResponse();// get response from server.... 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 


    } 
} 
} 

Answer 1

Вы должны импортировать некоторые библиотеки. Может быть, вы можете смотреть на это: https://github.com/erikwt/PullToRefresh-ListView

Answer 2

Обновить код, как этот

@Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     m_Main = inflater.inflate(R.layout.deal_listing, container, false);//intialize mainLayout 
     new CDealDataSent().execute(m_DealListingURL);// execute Url to fetch Deal list from serevr. 
    } 
    private void init() {// initialize controls 

     mSwipeRefresh = (SwipeRefreshLayout) m_Main.findViewById(R.id.activity_main_swipe_refresh_layout); 
     mSwipeRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { 
      @Override 
      public void onRefresh() { 
       m_ListView.removeFooterView(loadMoreButton); // call this 
       s_oDataset.clear(); 
       new CDealDataSent().execute(m_DealListingURL);// execute Url to fetch Deal list from serevr. 
      } 
     });