Frames Skipped! (app may be doing too much work)

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.activity_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://techwarriorz.com/v2/?json=1");
            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);

                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;
    }

}