JAVA ANDROID: JSON values from php page not showing

JAVA ANDROID: JSON values from php page not showing

Although this is just a rough sketch..i just want to see if it will
work..Anytime i run the program it doesn't crash and it doesn't show
anything. The error showing on the logcat is JSON result form the php
page..i don't know why the Postexecute() method is not working...
this is the error
09-14 18:21:07.079: E/JSON(21310):
{"tag":"getTopic","success":1,"error":0,"data":[{"title":"Facebook finally
rolls GRAPH Search","tid":"81","time":"2013-06-22
10:05:18"},{"title":"What is Ubuntu for
Android?","tid":"69","time":"2013-06-22 10:18:00"},{"title":"Android and
Windows on same device(samsung)","tid":"98","time":"2013-06-22
10:18:35"},{"title":"\"Tweet\" has been verified as a real word in
English","tid":"67","time":"2013-06-22 10:27:33"},{"title":"Instagram now
has video recording","tid":"97","time":"2013-06-22 10:27:45"},{"title":"An
Open Letter to DBanj","tid":"70","time":"2013-06-22
10:31:41"},{"title":"MTN call rate wahala","tid":"84","time":"2013-06-22
10:32:44"},{"title":"Types of friends essential for
women","tid":"33","time":"2013-06-22 10:45:41"},{"title":"Not to be loved
in return","tid":"106","time":"2013-06-22 18:15:06"},{"title":"I am in
love with you","tid":"107","time":"2013-06-22 18:28:56"},{"title":"I hate
it!!!","tid":"115","time":"2013-06-23 19:06:26"},{"title":"Spoils of
love","tid":"116","time":"2013-06-23 19:14:43"},{"title":"An Apology
Letter from Men To Women","tid":"117","time":"2013-06-26
12:43:02"},{"title":"Ramadan Starts tomorrow (in sha Allah)
!!!","tid":"120","time":"2013-07-09 15:06:09"},{"title":"Preventing
infidelity on your marriage","tid":"29","time":"2013-07-14
12:06:31"},{"title":"How to have a healthy
relationship","tid":"121","time":"2013-08-02 17:17:32"},{"title":"ASUU
strike not ending anytime soon","tid":"124","time":"2013-08-27
12:56:26"},{"title":"Google Announces Android 4.4
KitKat","tid":"126","time":"2013-09-06 20:51:32"},{"title":"Apple Launches
iPhone 5s and iPhone 5c","tid":"127","time":"2013-09-11 15:29:40"}]}
and this is the class
import java.util.ArrayList;
import java.util.HashMap;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.nairation.library.JSONParser;
import com.nairation.library.UserFunctions;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
public class Topic_page extends Activity implements OnItemClickListener{
public static final String TOPIC_DURATION = "relative";
public static final String TOPIC_TITLE = "title";
public static final String TOPIC_PREVIEW = "Testing out";
public static final String TOPIC_ID = null;
public static final Object TOPIC_THUMB_URL = null;
ListView list;
TopicListAdapter adapter;
UserFunctions userf;
JSONParser jpa;
ArrayList<HashMap<String, String>> topicList = new
ArrayList<HashMap<String,String>>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.topic_page);
list = (ListView) findViewById(R.id.topic_list);
adapter = new TopicListAdapter(this, topicList);
list.setAdapter(adapter);
list.setOnItemClickListener(this);
try{
new ServiceSync().execute("mash");
}catch(Exception e){
String message = e.getMessage();
}
}
private class ServiceSync extends AsyncTask<String, JSONObject,
JSONObject>{
@Override
protected JSONObject doInBackground(String... params) {
// TODO Auto-generated method stub
String uname = params[0];
userf = new UserFunctions();
JSONObject jp = userf.getTopic(uname);
return jp;
}
@Override
protected void onPostExecute(JSONObject result) {
// TODO Auto-generated method stub
//super.onPostExecute(result);
try {
JSONArray obj = result.getJSONArray("data");
for (int i = 0; i < result.length(); i++) {
JSONObject data = obj.getJSONObject(i);
HashMap<String, String> map = new HashMap<String,
String>();
String title = data.getString(TOPIC_TITLE);
String time = data.getString("time");
String tid = data.getString("tid");
map.put(TOPIC_TITLE, title);
map.put("Date", time);
topicList.add(map);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Problem with
loading the feeds", Toast.LENGTH_LONG).show();
}
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int
position, long id) {
// TODO Auto-generated method stub
}
}
So what could be the problem the JSON result is not being processed..