Getting JSON data from own website

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(NetworkIsAvailable())    {
        mProgressBar.setVisibility(View.VISIBLE);
        GetBlogPostsTask getBlogPostsTask = new GetBlogPostsTask();
        getBlogPostsTask.execute();
    }
    else {
        Toast.makeText(this, "Network is unavailable!", Toast.LENGTH_LONG).show();
    }

    //String message = getString(R.string.no_items);
    //Toast.makeText(this, message, Toast.LENGTH_LONG).show();

}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    try {
    JSONArray jsonPosts = mBlogData.getJSONArray("posts");
    JSONObject jsonPost = jsonPosts.getJSONObject(position);
    String blogUrl = jsonPost.getString("url");

    Intent intent = new Intent(this,BlogWebViewActivity.class);
    intent.setData(Uri.parse(blogUrl));
    startActivity(intent);
}
    catch (JSONException e) {
        logException(e);
    }
}

private void logException(Exception e) {
    Log.e(TAG, "Exception caught!", e);
}

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

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

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_2, keys, ids);
            setListAdapter(adapter);
        } catch (JSONException e) {
            logException(e);
        }
    }

}


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);

                    jsonResponse = new JSONObject(responseData);
                }
                else {
                Log.i(TAG, "Unsuccessful HTTP Response Code: " + responseCode);
                }
            }
            catch (MalformedURLException e) {
                logException(e);
            }
            catch (IOException e) {
                logException(e);
            }
            catch (Exception e) {
                logException(e);
            }

           return jsonResponse;
    }

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

}

                responseCode = connection.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
                    InputStream inputStream = connection.getInputStream();
                    Reader reader = new InputStreamReader(inputStream);
                    int contentLength = connection.getContentLength();
                    Log.d("BlogReader", "CONTENT LENGTH IS: "+contentLength);
                    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) {
                logException(e);
            }
            catch (IOException e) {
                logException(e);
            }
            catch (Exception e) {
                logException(e);
            }

           return jsonResponse;
    }

                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_2, keys, ids);
            setListAdapter(adapter);
        } catch (JSONException e) {
            logException(e);
        }
    }

}