Question

       package com.crumbin.tabs;

//java package
import java.io.IOException;
import java.util.ArrayList;

import org.json.JSONException;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.ListView;

import com.crumbin.main.R;
import com.crumbin.models.User;
import com.crumbin.utilities.UserFollowingListAdapter;


public class HomeActivity extends Activity{

     final ArrayList<User> users1 = new ArrayList<User>();  
     User user;
//  public ArrayList<User> users1 = new ArrayList<User>();
     private UserFollowingListAdapter csl;
        private ListView lv;
   @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.user_main_tab_home);
      lv = (ListView) findViewById(R.id.user_crumbs_list); 

     // ListView lv = (ListView) findViewById(R.id.user_crumbs_list);








      AsyncLoader task = new AsyncLoader();
      task.execute();




      }



       private    class AsyncLoader extends AsyncTask<String,Void, String> {
               ProgressDialog dialog;

            @Override

            protected void onPreExecute(){
                 String pa = "helllo";
                   return;

            }

            @Override
            protected String doInBackground(String... pa) {
                String response = "";



                    try {

                      try {
                            user = new User("4eeb34c6d80e8f1214000000");
                            user.getFollowingCrumbsUpList();
                            for(User u : user.following){
                                users1.add(u);
                            }
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        } catch (JSONException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }








                    } catch (Exception e) {
                        e.printStackTrace();
                    }

            return response;
            }

            protected void onPostExecute(String result) {
                //dialog.dismiss();
                ListView lv = (ListView) findViewById(R.id.user_crumbs_list);

                final UserFollowingListAdapter csl = new UserFollowingListAdapter(HomeActivity.this,R.layout.user_crumbs_list_item,users1,this);
                    lv.setAdapter(csl);
                return;

            }





       }





      public void showError(){
       new AlertDialog.Builder(this)
       .setTitle(" Oops , Server down :( ")
       .setPositiveButton("Ok", new DialogInterface.OnClickListener() {

           @Override
           public void onClick(DialogInterface arg0, int arg1) {
               // TODO Auto-generated method stub

           }
           //
       }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int whichButton) {
               // Do nothing.
           }
       }).show();

     }
}

Error:

02-04 13:11:34.596: E/AndroidRuntime(2464): FATAL EXCEPTION: main
02-04 13:11:34.596: E/AndroidRuntime(2464): java.lang.ClassCastException: com.crumbin.tabs.HomeActivity$AsyncLoader cannot be cast to android.app.Activity
02-04 13:11:34.596: E/AndroidRuntime(2464):     at com.crumbin.utilities.UserFollowingListAdapter.<init>(UserFollowingListAdapter.java:40)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at com.crumbin.tabs.HomeActivity$AsyncLoader.onPostExecute(HomeActivity.java:106)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at com.crumbin.tabs.HomeActivity$AsyncLoader.onPostExecute(HomeActivity.java:1)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at android.os.AsyncTask.finish(AsyncTask.java:602)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at android.os.AsyncTask.access$600(AsyncTask.java:156)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at android.os.Looper.loop(Looper.java:137)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at android.app.ActivityThread.main(ActivityThread.java:4424)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at java.lang.reflect.Method.invokeNative(Native Method)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at java.lang.reflect.Method.invoke(Method.java:511)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-04 13:11:34.596: E/AndroidRuntime(2464):     at dalvik.system.NativeStart.main(Native Method)

No data is loading. The loop doesn’t even reach the OnpostExecute(). What might be the error? I’m not getting errors. Just that it is not even reaching that part.

What I want to do is this:

Just load the data into a list. That is about it. And still this is not working. The logic is fine. This works if I use it without AsyncTask. But, if I put the code in it, it doesn’t work.

Answer 1

Your AsyncTask class should be outside the onCreate() not inside the onCreate().

     UserFollowingListAdapter csl;

     @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.user_main_tab_home);
          .............
          ListView lv = (ListView) findViewById(R.id.user_crumbs_list);

          csl = new UserFollowingListAdapter(HomeActivity.this,
                                   R.layout.user_crumbs_list_item,users1,this);
          lv.setAdapter(csl);
          new AsyncLoader().execute(user);  
     }
 class AsyncLoader extends AsyncTask<User,Void, String> {

    ..................
    protected void onPostExecute(String result) {
       csl.notifyDataSetChanged(); // refresh your ListView
    }
}