ERROR while trying to delete news (ANDROID JSON)

Question

At this link teaches to list comments (in my case news) using external database. There is the download of the project.

How can I delete a news by selecting and still make one appear Dialog asking whether or not to delete the news from the external database. I understand the following error in the log: FATAL EXCEPTION: AsyncTask #2

Follow the design I’m using.

package br.com.transparencia.conexaoweb;

import java.util.ArrayList;
import java.util.List;

import android.widget.ArrayAdapter;
import java.util.HashMap;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import br.com.transparencia.R;
import br.com.transparencia.conexaoweb.ConexaoHttpClient;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class ReadNoticiasPrefeitura extends ListActivity {
    private ProgressDialog pDialog;
    private Object json;
    private static final String READ_COMMENTS_URL = " "; // URL LISTAR NOTICIAS
    private static final String DELETE_COMMENTS_URL = " "; // URL DELETAR NOTICIAS

    private static final String TAG_SUCCESS = "success";
    private static final String TAG_TITULO = "titulo";
    private static final String TAG_POSTS = "posts";
    private static final String TAG_POST_ID = "id";
    private static final String TAG_NOTICIA = "noticia";

    // An array of all of our comments
    private JSONArray mComments = null;
    private ArrayList<HashMap<String, String>> mCommentList;
    public JSONParser jsonParser;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.read_noticias_prefeitura);
    }

    @Override
    protected void onResume() {
        super.onResume();
        new LoadComments().execute();
    }

    public void sair(View v) {
        finish();
    }

    public void updateJSONdata() {

        mCommentList = new ArrayList<HashMap<String, String>>();

        JSONParser jParser = new JSONParser();
        JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL);
        try {
            mComments = json.getJSONArray(TAG_POSTS);
            for (int i = 0; i < mComments.length(); i++) {
                JSONObject c = mComments.getJSONObject(i);

                String titulo = c.getString(TAG_TITULO);
                String content = c.getString(TAG_NOTICIA);

                HashMap<String, String> map = new HashMap<String, String>();
                map.put(TAG_TITULO, titulo);
                map.put(TAG_NOTICIA, content);

                mCommentList.add(map);

            }

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

    private void updateList() {
        ListAdapter adapter = new SimpleAdapter(this, mCommentList,
                R.layout.single_post, new String[] { TAG_TITULO, TAG_NOTICIA
                         }, new int[] { R.id.titulo, R.id.noticia });

        setListAdapter(adapter);
        ListView lv = getListView();    

        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {

                new DeleteCard().execute();             

                  }         
        });
    }
    class DeleteCard extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(ReadNoticiasPrefeitura.this);
            pDialog.setMessage("Deleting Product...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        /**
         * Deleting product
         * */
        protected String doInBackground(String... args) {
            int success;
            try {
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("titulo", TAG_TITULO));

                JSONObject json = jsonParser.makeHttpRequest(
                        DELETE_COMMENTS_URL, "POST", params);

                Log.d("DELETAR", json.toString());

                success = json.getInt(TAG_SUCCESS);
                if (success == 1) {
                    Intent i = getIntent();
                    setResult(100, i);
                    finish();
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        protected void onPostExecute(String file_url) {
            pDialog.dismiss();
        }
    }
/* ----------------------------------------------------------------------------------------*/

    public class LoadComments extends AsyncTask<Void, Void, Boolean> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(ReadNoticiasPrefeitura.this);
            pDialog.setMessage("Carregando...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected Boolean doInBackground(Void... arg0) {
            updateJSONdata();
            return null;

        }

        @Override
        protected void onPostExecute(Boolean result) {
            super.onPostExecute(result);
            pDialog.dismiss();
            updateList();
        }
    }
/* ########################################################################################################## */        
        public void mensagemExibir(String titulo, String texto)
        {
            AlertDialog.Builder mensagem = new AlertDialog.Builder(ReadNoticiasPrefeitura.this);
            mensagem.setTitle(titulo);
            mensagem.setMessage(texto);
            mensagem.setNeutralButton("OK", null);
            mensagem.show();
        }
}

Answer 1

Urls are not being filled in, with the service path:

private static final String READ_COMMENTS_URL = " "; // URL LISTAR NOTICIAS
private static final String DELETE_COMMENTS_URL = " "; // URL DELETAR NOTICIAS

I found nowhere setting these variables, see if that’s not it.

If it’s not that see if your service is working properly, a good tool for testing end-points is is.

Your error is generic, ta just stating that there was an error in AsyncTask #2. Try to get more details so we can help.