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POAsynTask with Endless Listview Scroll in android
 

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    <p>I am creating an application where in i need to have endless scrolling listview. I dnt want to use any library in my application. I have seen some examples on line that help in achieving such listview,but my doubt is how can i have an endless listview when my data are coming from server and are getting parsed in the Asynctask. How can i load 10 items at a time from my asynctask on scroll? I want to know to implement a endless listview on asyntask. Do i call my asynctask in the onScroll() or not???</p> <pre><code>public class EndlessScrollExample extends ListActivity { public JSONArray jsonarray,jsondatearray; public String url; public String selectedvalue; public String TAG = "TAG Event Display"; public String SuggestCity; public String SuggestState; public String suggestCountry; public String event_id,address; String lat; String lng; public String event_name; public String dateKey; public String datetime,timenew; Calendar cal; public SharedPreferences prefs; public Editor editor; public String access_token,id,username; public static ArrayList&lt;EventsBean&gt; arrayEventsBeans = new ArrayList&lt;EventsBean&gt;(); ArrayList&lt;DateBean&gt; sortArray = new ArrayList&lt;DateBean&gt;(); public SAmpleAdapter adapter; public ImageView img_menu,img_calender; public ListView listview; public EventsBean eventsbean; int counter = 0; int currentPage = 0; FetchEventValues fetchValues; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setTheme(android.R.style.Theme); setContentView(R.layout.sample_endless); listview = (ListView)findViewById(android.R.id.list); try { // Preferences values fetched from the preference of FBConnection class. prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); access_token = prefs.getString("access_token", null); id = prefs.getString("uid", null); username = prefs.getString("username", null); if(access_token == null &amp;&amp; id == null &amp;&amp; username == null) { Toast.makeText(getApplicationContext(), "FaceBook Login was not successful" + "/nPlease Relogin.", Toast.LENGTH_SHORT).show(); } else { Log.i(TAG, "VALUES::" + access_token+ " " + id + " " +username); url = "my Url"; } } catch (NullPointerException e) { Log.i(TAG, "User Not Logged IN " + e.getMessage()); // TODO Auto-generated catch block e.printStackTrace(); } fetchValues = new FetchEventValues(); fetchValues.execute(); listview = getListView(); listview.setOnScrollListener(new EndlessScrollListener()); } // AsyncTask Class called in the OnCreate() when the activity is first started. public class FetchEventValues extends AsyncTask&lt;Integer, Integer, Integer&gt; { ProgressDialog progressdialog = new ProgressDialog(EndlessScrollExample.this); @SuppressLint("SimpleDateFormat") @SuppressWarnings("unchecked") @Override protected Integer doInBackground(Integer... params) { currentPage++; // Creating JSON Parser instance JsonParser jParser = new JsonParser(); // getting JSON string from URL //arrayEventsBeans.clear(); JSONObject jsonobj = jParser.getJSONFromUrl(url); Log.i(TAG, "URL VALUES:" + url); try{ // Code to get the auto complete values Autocomplete Values JSONArray jsonAarray = jsonobj.getJSONArray(Constants.LOCATIONS); eventsbean = new EventsBean(); Log.e(TAG, "Location Array Size:" + jsonAarray.length()); for(int j = 0 ; j &lt; jsonAarray.length() ; j++) { if(!jsonAarray.getJSONObject(j).isNull(Constants.LOCATION_CITY) &amp;&amp; !jsonAarray.getJSONObject(j).isNull(Constants.LOCATION_STATE) &amp;&amp; !jsonAarray.getJSONObject(j).isNull(Constants.LOCATION_COUNTRY)) { JSONObject job = jsonAarray.getJSONObject(j); if(job.has(Constants.LOCATION_STATE)) { SuggestCity = job.getString(Constants.LOCATION_CITY); eventsbean.setLocation_city(job.getString(Constants.LOCATION_CITY)); SuggestState = job.getString(Constants.LOCATION_STATE); eventsbean.setLocation_state(job.getString(Constants.LOCATION_STATE)); suggestCountry = job.getString(Constants.LOCATION_COUNTRY); eventsbean.setLocation_country(job.getString(Constants.LOCATION_COUNTRY)); } } } // JSON object to fetch the events in datewise format JSONObject eventobject = jsonobj.getJSONObject("events"); arrayEventsBeans = new ArrayList&lt;EventsBean&gt;(); // @SuppressWarnings("unchecked") Iterator&lt;Object&gt; keys = eventobject.keys(); while (keys.hasNext()) { String datestring = String.valueOf(keys.next()); if (datestring.trim().length() &gt; 0) { SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); Date date = formatter.parse(datestring); DateBean dateBean = new DateBean(date); sortArray.add(dateBean); } // JSONArray jsonArray = eventobject.getJSONArray(datestring); //System.out.println(" --"+jsonArray); } System.out.println("size:"+sortArray.size()); System.out.println("==========sorting array======"); Collections.sort(sortArray,new CompareDate()); //reverse order //Collections.reverse(sortArray); for(DateBean d : sortArray){ dateKey = new SimpleDateFormat("yyyy-MM-dd").format(d.getDate()); System.out.println(dateKey); Date today = new Date(); Date alldates = d.getDate(); /// Calendar alldates1 = Calendar.getInstance(); JSONArray jsonArray = eventobject.getJSONArray(dateKey); System.out.println(" --"+jsonArray); for (int i = 0 ; i &lt; jsonArray.length() ; i++) { if ((today.compareTo(alldates) &lt; 0 || (today.compareTo(alldates)== 0))) // if (alldates1 &gt; cal) alldates.getTime() &gt;= today.getTime() { String currentTimeStr = "7:04 PM"; Date userDate = new Date(); String userDateWithoutTime = new SimpleDateFormat("yyyyMMdd").format(userDate); String currentDateStr = userDateWithoutTime + " " + currentTimeStr; Date currentDate = new SimpleDateFormat("yyyyMMdd h:mm a").parse(currentDateStr); if (userDate.compareTo(currentDate) &gt;= 0) { System.out.println(userDate + " is greater than or equal to " + currentDate); } else { System.out.println(userDate + " is less than " + currentDate); } JSONObject jsonobjname = jsonArray.getJSONObject(i); EventsBean eventsbean = new EventsBean(); JSONObject jobjectpicture = jsonobjname.getJSONObject(Constants.PICTURE); JSONObject jobjeventpicture = jobjectpicture.getJSONObject(Constants.DATA); eventsbean.setUrl(jobjeventpicture.getString(Constants.URL)); if(jsonobjname.has(Constants.OWNER)) { JSONObject owner_obj = jsonobjname.getJSONObject(Constants.OWNER); eventsbean.setOwner_id(owner_obj.getString(Constants.OWNER_ID)); eventsbean.setOwner_name(owner_obj.getString(Constants.OWNER_NAME)); String owner_name = owner_obj.getString(Constants.OWNER_NAME); Log.i(TAG, "Owner:" + owner_name); } if(!jsonobjname.isNull(Constants.COVER)) { JSONObject objectcover = jsonobjname.getJSONObject(Constants.COVER); eventsbean.setCover_id(objectcover.getString(Constants.COVER_ID)); eventsbean.setSource(objectcover.getString(Constants.SOURCE)); String cover_url = objectcover.getString(Constants.SOURCE); Log.i(TAG, "Cover Url:" + cover_url); eventsbean.setOffset_y(objectcover.getString(Constants.OFFSET_Y)); eventsbean.setOffset_x(objectcover.getString(Constants.OFFSET_X)); } eventsbean.setName(jsonobjname.getString(Constants.NAME)); eventsbean.setEvent_id(jsonobjname.getString(Constants.EVENT_ID)); eventsbean.setStart_time(jsonobjname.getString(Constants.START_TIME)); eventsbean.setDescription(jsonobjname.getString(Constants.DESCRIPTION)); eventsbean.setLocation(jsonobjname.getString(Constants.LOCATION)); if(!jsonobjname.isNull(Constants.IS_SILHOUETTE)) { eventsbean.setIs_silhouette(jsonobjname.getString(Constants.IS_SILHOUETTE)); } eventsbean.setPrivacy(jsonobjname.getString(Constants.PRIVACY)); datetime = jsonobjname.getString(Constants.START_TIME); if(!jsonobjname.isNull(Constants.VENUE)) { JSONObject objectvenue = jsonobjname.getJSONObject(Constants.VENUE); if(objectvenue.has(Constants.VENUE_NAME)) { eventsbean.setVenue_name(objectvenue.getString(Constants.VENUE_NAME)); event_name = objectvenue.getString(Constants.VENUE_NAME); Log.i(TAG, "Event Venue Name:" + event_name); } else { eventsbean.setLatitude(objectvenue.getString(Constants.LATITUDE)); eventsbean.setLongitude(objectvenue.getString(Constants.LONGITUDE)); eventsbean.setCity(objectvenue.getString(Constants.CITY)); eventsbean.setState(objectvenue.getString(Constants.STATE)); eventsbean.setCountry(objectvenue.getString(Constants.COUNTRY)); eventsbean.setVenue_id(objectvenue.getString(Constants.VENUE_ID)); eventsbean.setStreet(objectvenue.getString(Constants.STREET)); address = objectvenue.getString(Constants.STREET); eventsbean.setZip(objectvenue.getString(Constants.ZIP)); } } arrayEventsBeans.add(eventsbean); Log.i(TAG, "arry list values:" + arrayEventsBeans.size()); } } } }catch(Exception e){ Log.e(TAG , "Exception Occured:" + e.getMessage()); } return null; } class CompareDate implements Comparator&lt;DateBean&gt;{ @Override public int compare(DateBean d1, DateBean d2) { return d1.getDate().compareTo(d2.getDate()); } } @Override protected void onProgressUpdate(Integer... values) { // TODO Auto-generated method stub super.onProgressUpdate(values); } @Override protected void onPostExecute(Integer result) { // TODO Auto-generated method stub super.onPostExecute(result); if(this.progressdialog.isShowing()) { this.progressdialog.dismiss(); } if(adapter == null) { adapter = new SAmpleAdapter(EndlessScrollExample.this, 0, arrayEventsBeans); listview.setAdapter(adapter); } else { adapter.notifyDataSetChanged(); } //currentPage++; } @Override protected void onPreExecute() { super.onPreExecute(); this.progressdialog.setMessage("Loading...."); this.progressdialog.setCanceledOnTouchOutside(false); this.progressdialog.show(); } public int setPage(int currentPage) { return currentPage; // TODO Auto-generated method stub } } public class EndlessScrollListener implements OnScrollListener { private int visibleThreshold = 0; private int currentPage = 0; public EndlessScrollListener() { } public EndlessScrollListener(int visibleThreshold) { this.visibleThreshold = visibleThreshold; } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { if (scrollState == SCROLL_STATE_IDLE) { if (listview.getLastVisiblePosition() &gt;= listview.getCount() - visibleThreshold) { currentPage++; fetchValues.setPage(currentPage); fetchValues.execute(); } } } } } </code></pre> <p>Thanks in advance. </p>
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    1. COpls explain a bit more as i am confused what you really want ? circle listview ?
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    2. CONo I want to use endless scroll listview in my project, i cant implement it as i dnt know how to use it with asynctsk.
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      1. USandroid_developer
    3. COI have read examples on the net but they are not showing how to use asynctask on endless listview
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      1. USandroid_developer
 

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