Blog Reader - JSON Exception

package com.duelingsquids.blogreader;

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 java.util.ArrayList;
import java.util.HashMap;

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

import android.app.AlertDialog;
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.text.Html;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class MainListActivity extends ListActivity {

    public static final int NUMBER_OF_POSTS = 20;
    public static final String TAG = MainListActivity.class.getSimpleName();
    protected JSONObject mBlogData;
    protected ProgressBar mProgressBar;
    private final String KEY_TITLE = "title";
private final String KEY_AUTHOR = "author";

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

    mProgressBar = (ProgressBar) findViewById(R.id.progressBar1);

    if(isNetworkAvailable()){
        mProgressBar.setVisibility(View.VISIBLE);
        GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
        getBlogPostsTask.execute();
    }else{
            Toast.makeText(this, "Network is unavailable!",          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) {
    getMenuInflater().inflate(R.menu.main_list, menu);
    return true;    }



public void handleBlogResponse() {
    mProgressBar.setVisibility(View.INVISIBLE);

    if(mBlogData == null){

        updateDisplayForError();

    }else{

        try {
            JSONArray jsonPosts = mBlogData.getJSONArray("Posts");
            ArrayList<HashMap<String, String>> blogPosts = new ArrayList<HashMap<String, String>>();
            for(int i = 0;i < jsonPosts.length(); i++){

                JSONObject post = jsonPosts.getJSONObject(i);
                String title = post.getString(KEY_TITLE);
                title = Html.fromHtml(title).toString();
                String author = post.getString(KEY_AUTHOR);
                author = Html.fromHtml(author).toString();

                HashMap<String, String> blogPost = new HashMap<String, String>();
                blogPost.put(KEY_TITLE, title);
                blogPost.put(KEY_AUTHOR, author);

                blogPosts.add(blogPost);

            }

            String[] keys = {KEY_TITLE, KEY_AUTHOR};
            int[] ids = {android.R.id.text1, android.R.id.text2};
            SimpleAdapter adapter = new SimpleAdapter(this, blogPosts, android.R.layout.simple_list_item_1, keys, ids);
            setListAdapter(adapter);

        } catch (JSONException e) {
            Log.e(TAG,"Exception Caught! Boom");
        }

    }

}

private void updateDisplayForError() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(getString(R.string.error_title));
    builder.setMessage(getString(R.string.error_message));
    builder.setPositiveButton(android.R.string.ok, null);
    AlertDialog dialog = builder.create();
    dialog.show();

    TextView emptyTextView = (TextView) getListView().getEmptyView();
    emptyTextView.setText(getString(R.string.no_items));
}

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

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

        try {
            URL blogFeedUrl = new URL("http://blog.teamtreehouse.com/api/get_recent_summary/?count=" + 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 contentLength = connection.getContentLength();
                char[] charArray = new char[contentLength];
                reader.read(charArray);
                String responseData = new String(charArray);
                Log.v(TAG, responseData);

                jsonResponse = new JSONObject(responseData);

            }else{
                Log.i(TAG, "Uncessful HTTP Response Code: " + responseCode);
            }
            Log.i(TAG, "Code: " + responseCode);
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            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 jsonResponse;
    }

    @Override
    protected void onPostExecute(JSONObject result) {
        mBlogData = result;
        handleBlogResponse();
    }

}

}