Building a bloag reader - Parsing Data JSON

int nextCharacter; // read() returns an int, we cast it to char later
String responseData = "";
while(true){ // Infinite loop, can only be stopped by a "break" statement
    nextCharacter = reader.read(); // read() without parameters returns one character
    if(nextCharacter == -1) // A return value of -1 means that we reached the end
        break;
    responseData += (char) nextCharacter; // The += operator appends the character to the end of the string
}

JSONArray jsonPosts = jsonResponse.getJSONArray("posts");
                        for (int i = 0; i < jsonPosts.length(); i++) {
                            JSONObject jsonPost = jsonPosts.getJSONObject(i);
                            String title = jsonPost.getString("title");
                            Log.v(TAG, "Posts" + i + ":" + title);

11-10 02:57:29.774    1688-1688/qax.khabaralyoum E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: qax.khabaralyoum, PID: 1688
    java.lang.NullPointerException
            at qax.khabaralyoum.MainListActivity.handleBlogResponse(MainListActivity.java:84)
            at qax.khabaralyoum.MainListActivity$GetBlogPostsTask.onPostExecute(MainListActivity.java:183)
            at qax.khabaralyoum.MainListActivity$GetBlogPostsTask.onPostExecute(MainListActivity.java:134)
            at android.os.AsyncTask.finish(AsyncTask.java:632)
            at android.os.AsyncTask.access$600(AsyncTask.java:177)
            at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5001)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)

package qax.khabaralyoum;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.ListActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;


import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import org.json.JSONArray;
import org.json.JSONObject;

import android.app.ListActivity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.Toast;

public class MainListActivity extends ListActivity {

    protected String[] mBlogPostTitles;
    public static final int NUMBER_OF_POSTS = 20;
    public static final String TAG = MainListActivity.class.getSimpleName();

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

        if (isNetworkAvailable()) {
            GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
            getBlogPostsTask.execute();
        }
        else {
            Toast.makeText(this, "Network is unavailable!", Toast.LENGTH_LONG).show();
        }

        //Toast.makeText(this, getString(R.string.no_items), Toast.LENGTH_LONG).show();
    }

    private boolean isNetworkAvailable() {
        ConnectivityManager manager = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();

        boolean isAvailable = false;
        if (networkInfo != null && networkInfo.isConnected()) {
            isAvailable = true;
        }

        return isAvailable;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main_list, menu);
        return true;
    }

    private class GetBlogPostsTask extends AsyncTask<Object, Void, String> {

        @Override
        protected String doInBackground(Object... arg0) {
            int responseCode = -1;

            try {
                URL blogFeedUrl = new URL("http://esouqbh.com/khabar/?json=get_recent_posts" + NUMBER_OF_POSTS);
                HttpURLConnection connection = (HttpURLConnection) blogFeedUrl.openConnection();
                connection.connect();

                responseCode = connection.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    InputStream inputStream = connection.getInputStream();
                    Reader reader = new InputStreamReader(inputStream);
                    int nextCharacter;
                    String responseData = "";
                    while (true) {
                        nextCharacter = reader.read();
                        if (nextCharacter == -1)
                            break;
                        responseData += (char) nextCharacter;


                        JSONObject jsonResponse = new JSONObject(responseData);
                        String status = jsonResponse.getString("status");
                        Log.v(TAG, status);

                        JSONArray jsonPosts = jsonResponse.getJSONArray("posts");
                        for (int i = 0; i < jsonPosts.length(); i++) {
                            JSONObject jsonPost = jsonPosts.getJSONObject(i);
                            String title = jsonPost.getString("title");
                            Log.v(TAG, "Post " + i + ": " + title);
                        }
                    }

                }
                else {
                    Log.i(TAG, "Unsuccessful HTTP Response Code: " + responseCode);
                }
            }
            catch (MalformedURLException e) {
                Log.e(TAG, "Exception caught: ", e);
            }
            catch (IOException e) {
                Log.e(TAG, "Exception caught: ", e);
            }
            catch (Exception e) {
                Log.e(TAG, "Exception caught: ", e);
            }

            return "Code: " + responseCode;
        }

    }

}