Parsing Json url using async

Question

I get exceptions when running this code. I want to parse the url which is an array of json objects:

package com.example.compsci_734t;

import java.io.BufferedRea         


        

Answer 1

1. I have solved it.....tRy it really work

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package com.example.json_test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.util.ArrayList;
import java.util.zip.GZIPInputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity
{

        ArrayList items = new ArrayList();
        static InputStream is = null;
        private static String url = "http://redsox.tcs.auckland.ac.nz/734A/CSService.svc/courses";
        JSONArray people = null;
        private static final String TAG_COURSES = "codeField";
        private static final String TAG_SEMESTER="semesterField";
        static JSONObject jObj = null;
        static String json = "";

        @Override
        public void onCreate(Bundle savedInstanceState) 
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            new MyTasks().execute();
        }


        private class MyTasks extends AsyncTask 
        {

            @Override
            protected JSONObject doInBackground(URL... urls) 
            {
                try 
                {
                    DefaultHttpClient httpClient = new DefaultHttpClient();
                    HttpGet httpGet = new HttpGet(url);
                    HttpResponse httpResponse = httpClient.execute(httpGet);

                    HttpEntity httpEntity = httpResponse.getEntity();
                    is = httpEntity.getContent();

                } 
                catch (UnsupportedEncodingException e) 
                {
                    e.printStackTrace();
                } 
                catch (ClientProtocolException e) 
                {
                    e.printStackTrace();
                } catch (IOException e) 
                {
                    e.printStackTrace();
                }
              try 
              {
                InputStream inputStream = is;
                GZIPInputStream input = new GZIPInputStream(inputStream);
                InputStreamReader reader = new InputStreamReader(input);
                BufferedReader in = new BufferedReader(reader);
                StringBuilder sb = new StringBuilder();
                String line = null;

                while ((line = in.readLine()) != null) 
                {
                    sb.append(line);
                }
                is.close();
                json = sb.toString();
            } catch (Exception e) 
            {
                Log.e("Buffer Error", "Error converting result " + e.toString());
            }
            try 
            {

                JSONArray people = new JSONArray(json);

                for (int i = 0; i < people.length(); i++) 
                {
                    JSONObject p = people.getJSONObject(i);
                    String Courses = p.getString(TAG_COURSES);
                    String semester=p.getString(TAG_SEMESTER);

                    items.add(Courses);
                    items.add(semester);
                }

            } catch (JSONException e) 
            {
                Log.e("JSON Parser", "Error parsing data " + e.toString());
            } 
            return jObj;
            }

            @SuppressWarnings({ "unchecked", "rawtypes" })
            protected void onPostExecute(JSONObject json) 
            {
                ListView myListView = (ListView)findViewById(R.id.peopleList);
                myListView.setAdapter(new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1, items));
        }
        }
}

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