Blog Reader: Not Displaying Treehouse Posts or Toast Notification

package com.daviddrees.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 org.json.JSONArray;
import org.json.JSONException;
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.text.Html;
import android.util.Log;
import android.view.Menu;
import android.widget.ArrayAdapter;
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();
    protected JSONObject mBlogData;

    @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.main_list, menu);
        return true;
    }

    public void updateList() {
        if (mBlogData == null) {
            //TODO Handle Error
        }
        else {
            try {
                JSONArray jsonPosts = mBlogData.getJSONArray("posts");
                mBlogPostTitles = new String[jsonPosts.length()];
                for (int i = 0; i < jsonPosts.length(); i++) {
                    JSONObject post = jsonPosts.getJSONObject(i);
                    String title = post.getString("title");
                    title = Html.fromHtml(title).toString();
                    mBlogPostTitles[i] = title;
                }

                ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
                        android.R.layout.simple_list_item_1, mBlogPostTitles);

                setListAdapter(adapter);

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

    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);

                    jsonResponse = new JSONObject(responseData);
                }
                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 jsonResponse;
        }

    }

    protected void onPostExecute(JSONObject result) {
        mBlogData = result;
        updateList();
    }



}