onResume isn't properly executed when returning from Settings

In my app, when there's no WiFi connection, I turn the WiFi connection on with an AlertDialog and I call the WiFi Settings screen. When I hit the back button, I assume that it goes in the onResume() method of the MainActivity. In this method, I call a loadTweets method, which reloads my tweets. This works when I hop from one activity to another.

When I hit back in the WiFi Settings Screen, the debugger goes in the onResume method, loops through the loadTweets method, but it doesn't show the reloaded tweets.

Am I missing a step here?

onResume() method:

public void onResume(){
    super.onResume();
    checkWifi();   
    loadTweets();
}

LoadTweets method:

private ArrayList<Tweets> loadTweets(){
ArrayList<Tweets> tweets = new ArrayList<Tweets>();
try {
        HttpClient hc = new DefaultHttpClient();
 开发者_Python百科       HttpGet get = new
        HttpGet("http://search.twitter.com/search.json?q=JobXXL_be&rpp=5");
        HttpResponse rp = hc.execute(get);
        if(rp.getStatusLine().getStatusCode() == HttpStatus.SC_OK)
        {
                String result = EntityUtils.toString(rp.getEntity());
                JSONObject root = new JSONObject(result);
                JSONArray sessions = root.getJSONArray("results");
                for (int i = 0; i < sessions.length(); i++) {
                        JSONObject session = sessions.getJSONObject(i);
                        Tweets tweet = new Tweets();
                        tweet.setTweet(session.getString("text"));
                        tweet.setUser(session.getString("from_user"));
                        tweet.setDate(session.getString("created_at").substring(5,16));
                        tweets.add(tweet);
                }
        }
} catch (Exception e) {
        Log.e("TwitterFeedActivity", "Error loading JSON", e);
 }
 return tweets;
}

TweetListAdapter class:

private class TweetListAdaptor extends ArrayAdapter<Tweets> {
                private ArrayList<Tweets> tweets;
                public TweetListAdaptor(Context context, int textViewResourceId, ArrayList<Tweets> tweets) {
                         super(context, textViewResourceId, tweets);
                         this.tweets = loadTweets();
                }
                @Override
                public View getView(int position, View convertView, ViewGroup parent) {
                        View v = convertView;
                        if (v == null) {
                                LayoutInflater vi = (LayoutInflater) getSystemService (Context.LAYOUT_INFLATER_SERVICE);
                                v = vi.inflate(R.layout.tweetitem, null);
                        }
                        Tweets o = tweets.get(position);
                        TextView tt = (TextView) v.findViewById(R.id.TWEET_TEXT);
                        TextView bt = (TextView) v.findViewById(R.id.TWEET_SCREEN_NAME);
                        TextView date = (TextView) v.findViewById(R.id.TWEET_CREATED_AT);
                        tt.setText(o.getTweet());
                        bt.setText(o.getUser());
                        date.setText(o.getDate());
                        return v;
                }

                public void setTweets(ArrayList<Tweets> tweet){
                    this.tweets = tweet;
                }
            }

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Nothing in this code deals with showing your tweets. It only retrieves tweets, but you don't show them in onResume, do you? When you hop between activities the onCreate and onStart methods are invoked, probably you show your tweets somewhere there.