com.lullabot.android.apps.iosched.ui.TwitterStreamFragment.java Source code

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Here is the source code for com.lullabot.android.apps.iosched.ui.TwitterStreamFragment.java

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/*
 * Copyright 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lullabot.android.apps.iosched.ui;

import java.net.URL;
import java.util.ArrayList;

import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.text.Html;
import android.text.util.Linkify;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.lullabot.android.apps.iosched.R;

public class TwitterStreamFragment extends ListFragment {
    private ArrayList<Tweet> tweets = new ArrayList<Tweet>();

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        new MyBGTask().execute();
    }

    private class MyBGTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected Void doInBackground(Void... arg0) {
            try {
                tweets = getTweets("dcnyc10", 1);
            } catch (Exception e) {
                Log.e("TwitterFeedActivity", "Error loading JSON", e);
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            setListAdapter(new TweetItemAdapter(getActivity(), R.layout.tweets_items, tweets));
        }
    }

    public class TweetItemAdapter extends ArrayAdapter<Tweet> {
        private ArrayList<Tweet> tweets;

        public TweetItemAdapter(Context context, int textViewResourceId, ArrayList<Tweet> tweets) {
            super(context, textViewResourceId, tweets);
            this.tweets = tweets;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View v = convertView;
            if (v == null) {
                v = getActivity().getLayoutInflater().inflate(R.layout.tweets_items, null);
            }

            Tweet tweet = tweets.get(position);
            if (tweet != null) {
                TextView username = (TextView) v.findViewById(R.id.username);
                TextView message = (TextView) v.findViewById(R.id.tweet_msg);
                message.setAutoLinkMask(Linkify.WEB_URLS);
                ImageView image = (ImageView) v.findViewById(R.id.tweet_avatar);

                if (username != null) {
                    username.setText(tweet.username);
                }

                if (message != null) {
                    message.setText(Html.fromHtml(tweet.message));
                }
                if (image != null) {
                    image.setImageBitmap(getBitmap(tweet.image_url));
                }
            }
            return v;
        }
    }

    public ArrayList<Tweet> getTweets(String searchTerm, int page) {
        String searchUrl = "http://search.twitter.com/search.json?q=#" + searchTerm + "&rpp=50&page=" + page;

        ArrayList<Tweet> tweets = new ArrayList<Tweet>();

        HttpClient client = new DefaultHttpClient();
        HttpGet get = new HttpGet(searchUrl);

        ResponseHandler<String> responseHandler = new BasicResponseHandler();

        String responseBody = null;
        try {
            responseBody = client.execute(get, responseHandler);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        JSONObject jsonObject = null;
        JSONParser parser = new JSONParser();

        try {
            Object obj = parser.parse(responseBody);
            jsonObject = (JSONObject) obj;
        } catch (Exception ex) {
            Log.v("TEST", "Exception: " + ex.getMessage());
        }

        JSONArray arr = null;

        try {
            Object j = jsonObject.get("results");
            arr = (JSONArray) j;
        } catch (Exception ex) {
            Log.v("TEST", "Exception: " + ex.getMessage());
        }

        for (Object t : arr) {
            Tweet tweet = new Tweet(((JSONObject) t).get("from_user").toString(),
                    ((JSONObject) t).get("text").toString(), ((JSONObject) t).get("profile_image_url").toString());
            tweets.add(tweet);
        }

        return tweets;
    }

    public Bitmap getBitmap(String bitmapUrl) {
        try {
            URL url = new URL(bitmapUrl);
            return BitmapFactory.decodeStream(url.openConnection().getInputStream());
        } catch (Exception ex) {
            return null;
        }
    }

    public class Tweet {
        public String username;
        public String message;
        public String image_url;

        public Tweet(String username, String message, String url) {
            this.username = username;
            this.message = message;
            this.image_url = url;
        }
    }
}