Databases
StackOverflow2013
Postsdbo
POData load everytime when call activity from server
Body
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POData load everytime when call activity from server
    text
    copied!<p>When I call asynctask function data is load and display in listview but whenever i go into this activity everytime that function execute and load data again. But I just want that function call only once and display in listview. So what is the solution for that.</p> <p><strong>This is My full class code:</strong></p> <pre><code>public class Feed extends Fragment implements PullToRefreshAttacher.OnRefreshListener { Button btnSlider; ListView lv; String userid, success, message, eventType, feed_title, feed_desc, timeDate, like, commemt, Feeduserid, photo, posted, hasLike, latsId, noMore, feed_id, category_id, feedImg, result; InputStream is; ProgressDialog pDialog; InterNetConnectionDetector isNet = new InterNetConnectionDetector( getActivity()); ArrayList&lt;HashMap&lt;String, String&gt;&gt; contactList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); FeedAdapter fdp; HashMap&lt;String, String&gt; map; private uk.co.senab.actionbarpulltorefresh.library.PullToRefreshAttacher mPullToRefreshAttacher; int limit = 5; View v; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub v = inflater.inflate(R.layout.feed, container, false); if (android.os.Build.VERSION.SDK_INT &gt; 8) { StrictMode.ThreadPolicy stp = new StrictMode.ThreadPolicy.Builder() .permitAll().build(); StrictMode.setThreadPolicy(stp); } SharedPreferences pref = getActivity().getSharedPreferences("Login", Activity.MODE_PRIVATE); userid = pref.getString("user_id", "user_id"); btnSlider = (Button) v.findViewById(R.id.btnSlide); lv = (ListView) v.findViewById(R.id.feed_ListView); btnSlider.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub try { Sliding.viewActionsContentView.showActions(); } catch (Exception e) { // TODO: handle exception } } }); try { if (fdp == null) { new FeedData().execute(); } else { lv.setAdapter(fdp); } } catch (Exception e) { // TODO: handle exception } mPullToRefreshAttacher = new uk.co.senab.actionbarpulltorefresh.library.PullToRefreshAttacher( getActivity(), lv); // Set Listener to know when a refresh should be started mPullToRefreshAttacher .setRefreshListener((uk.co.senab.actionbarpulltorefresh.library.PullToRefreshAttacher.OnRefreshListener) this); ((LoadMore) lv) .setOnLoadMoreListener(new com.example.getconnected.LoadImage.LoadMore.OnLoadMoreListener() { public void onLoadMore() { // Do the work to load more items at the end of list // here new LoadDataTask().execute(); } }); return v; } /* * @Override protected void onCreate(Bundle savedInstanceState) { // TODO * Auto-generated method stub super.onCreate(savedInstanceState); * setContentView(R.layout.feed); * * if (Build.VERSION.SDK_INT &gt;= 8) { getActionBar().hide(); } * * if (android.os.Build.VERSION.SDK_INT &gt; 8) { * * StrictMode.ThreadPolicy stp = new StrictMode.ThreadPolicy.Builder() * .permitAll().build(); StrictMode.setThreadPolicy(stp); * * } * * try { new FeedData().execute(); * * } catch (Exception e) { // TODO: handle exception } * * SharedPreferences pref = getSharedPreferences("Login", * Activity.MODE_PRIVATE); userid = pref.getString("user_id", "user_id"); * * btnSlider = (Button) findViewById(R.id.btnSlide); lv = (ListView) * findViewById(R.id.feed_ListView); btnSlider.setOnClickListener(new * OnClickListener() { * * @Override public void onClick(View arg0) { // TODO Auto-generated method * stub * * int width = (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, * 40, getResources() .getDisplayMetrics()); * SlideoutActivity.prepare(getActivity(), R.id.inner_content, width); * startActivity(new Intent(getActivity(), MenuActivity.class)); * getoverridePendingTransition(0, 0); * * } }); * * mPullToRefreshAttacher = new PullToRefreshAttacher(getActivity(), lv); * * // Set Listener to know when a refresh should be started * mPullToRefreshAttacher .setRefreshListener((OnRefreshListener) * getActivity()); * * ((LoadMore) lv) .setOnLoadMoreListener(new * com.example.getconnected.LoadImage.LoadMore.OnLoadMoreListener() { public * void onLoadMore() { // Do the work to load more items at the end of list * // here new LoadDataTask().execute(); } }); } */ public class FeedData extends AsyncTask&lt;String, Integer, String&gt; { @Override protected void onPreExecute() { // TODO Auto-generated method stub super.onPreExecute(); pDialog = ProgressDialog.show(getActivity(), "", "Loading.."); pDialog.setCancelable(true); } @Override protected String doInBackground(String... params) { // TODO Auto-generated method stub return null; } @Override protected void onPostExecute(String result) { // TODO Auto-generated method stub super.onPostExecute(result); // data=jobj.toString(); try { DefaultHttpClient httpclient = new DefaultHttpClient(); String url = "http://www.sevenstarinfotech.com/projects/demo/GetConnected/api/feed.php?user_id=" + userid + "&amp;" + "limit=" + limit; HttpPost httppost = new HttpPost(url); Log.v("Feed Url:", url); httppost.addHeader("Content-Type", "application/x-www-form-urlencoded"); httppost.addHeader("app-key", "b51bc98b4d6fd0456f7f1b17278415fa49de57d5"); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent(); try { BufferedReader reader = new BufferedReader( new InputStreamReader(is, "iso-8859-1"), 8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } is.close(); result = sb.toString(); Log.v("Response is:", result); } catch (Exception e3) { Log.e("log_tag", "Error converting result " + e3.toString()); } // parse json data try { JSONObject ja = new JSONObject(result); JSONObject jdata = ja.getJSONObject("data"); success = jdata.getString("Success"); message = jdata.getString("Message"); latsId = jdata.getString("lastId"); noMore = jdata.getString("nomore"); JSONArray jArray = jdata.getJSONArray("Feeddetails"); for (int i = 0; i &lt; jArray.length(); i++) { map = new HashMap&lt;String, String&gt;(); JSONObject me = jArray.getJSONObject(i); map.put("sucess", success); map.put("message", message); map.put("latsId", latsId); map.put("noMore", noMore); eventType = me.getString("type"); feed_id = me.getString("feed_id"); feed_title = me.getString("feed_title"); category_id = me.getString("category_id"); feed_desc = me.getString("feed_desc"); timeDate = me.getString("timeposted"); posted = me.getString("postedby"); like = me.getString("likes"); photo = me.getString("photo"); commemt = me.getString("comments"); Feeduserid = me.getString("user_id"); hasLike = me.getString("hasliked"); map.put("eventType", eventType); map.put("feed_id", feed_id); map.put("feed_title", feed_title); map.put("category_id", category_id); map.put("feed_desc", feed_desc); map.put("timeDate", timeDate); map.put("posted", posted); map.put("like", like); map.put("photo", photo); map.put("commemt", commemt); map.put("Feeduserid", Feeduserid); map.put("hasLike", hasLike); Log.v("Data:", feed_id + "/" + "/" + "/" + Feeduserid + "/" + "/" + "/" + like + "/" + "/" + "/" + commemt); contactList.add(map); } Log.v("Length", contactList.size() + ""); } catch (Exception e1) { Log.e("log_tag", "Error in http connection " + e1.toString()); } } catch (Exception e) { // TODO: handle exception } pDialog.dismiss(); fdp = new FeedAdapter(getActivity(), contactList); lv.setAdapter(fdp); } } @Override public void onRefreshStarted(View view) { /** * Simulate Refresh with 4 seconds sleep */ new AsyncTask&lt;Void, Void, Void&gt;() { @Override protected Void doInBackground(Void... params) { try { Thread.sleep(4000); } catch (InterruptedException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void result) { super.onPostExecute(result); // Notify PullToRefreshAttacher that the refresh has finished mPullToRefreshAttacher.setRefreshComplete(); } }.execute(); } private class LoadDataTask extends AsyncTask&lt;String, Integer, String&gt; { @Override protected String doInBackground(String... params) { if (isCancelled()) { return null; } // Simulates a background task try { Thread.sleep(1000); } catch (InterruptedException e) { } return null; } @Override protected void onPostExecute(String result) { try { limit += 5; DefaultHttpClient httpclient = new DefaultHttpClient(); String url = "http://www.sevenstarinfotech.com/projects/demo/GetConnected/api/feed.php?user_id=" + userid + "&amp;" + "limit=" + limit; HttpPost httppost = new HttpPost(url); Log.v("Feed Url:", url); httppost.addHeader("Content-Type", "application/x-www-form-urlencoded"); httppost.addHeader("app-key", "b51bc98b4d6fd0456f7f1b17278415fa49de57d5"); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent(); try { BufferedReader reader = new BufferedReader( new InputStreamReader(is, "iso-8859-1"), 8); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } is.close(); result = sb.toString(); Log.v("Response is:", result); } catch (Exception e3) { Log.e("log_tag", "Error converting result " + e3.toString()); } // parse json data try { JSONObject ja = new JSONObject(result); JSONObject jdata = ja.getJSONObject("data"); success = jdata.getString("Success"); message = jdata.getString("Message"); latsId = jdata.getString("lastId"); noMore = jdata.getString("nomore"); JSONArray jArray = jdata.getJSONArray("Feeddetails"); for (int i = 0; i &lt; jArray.length(); i++) { map = new HashMap&lt;String, String&gt;(); JSONObject me = jArray.getJSONObject(i); map.put("sucess", success); map.put("message", message); map.put("latsId", latsId); map.put("noMore", noMore); eventType = me.getString("type"); feed_id = me.getString("feed_id"); feed_title = me.getString("feed_title"); category_id = me.getString("category_id"); feed_desc = me.getString("feed_desc"); timeDate = me.getString("timeposted"); posted = me.getString("postedby"); like = me.getString("likes"); photo = me.getString("photo"); commemt = me.getString("comments"); Feeduserid = me.getString("user_id"); hasLike = me.getString("hasliked"); map.put("eventType", eventType); map.put("feed_id", feed_id); map.put("feed_title", feed_title); map.put("category_id", category_id); map.put("feed_desc", feed_desc); map.put("timeDate", timeDate); map.put("posted", posted); map.put("like", like); map.put("photo", photo); map.put("commemt", commemt); map.put("Feeduserid", Feeduserid); map.put("hasLike", hasLike); Log.v("Data:", feed_id + "/" + "/" + "/" + Feeduserid + "/" + "/" + "/" + like + "/" + "/" + "/" + commemt); contactList.add(map); } pDialog.dismiss(); fdp = new FeedAdapter(getActivity(), contactList); lv.setAdapter(fdp); } catch (Exception e1) { Log.e("log_tag", "Error in http connection " + e1.toString()); } } catch (Exception e) { // TODO: handle exception } // mListItems.add("Added after load more"); // We need notify the adapter that the data have been changed fdp.notifyDataSetChanged(); // Call onLoadMoreComplete when the LoadMore task, has finished ((LoadMore) lv).onLoadMoreComplete(); super.onPostExecute(result); } @Override protected void onCancelled() { // Notify the loading more operation has finished ((LoadMore) lv).onLoadMoreComplete(); } } } </code></pre>
 

Querying!

 
Guidance
An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload