com.appdynamics.demo.gasp.fragment.TwitterResponderFragment.java Source code

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Here is the source code for com.appdynamics.demo.gasp.fragment.TwitterResponderFragment.java

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/*
 * Copyright (c) 2013 Mark Prichard
 *
 * 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.appdynamics.demo.gasp.fragment;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Toast;

import com.appdynamics.demo.gasp.R;
import com.appdynamics.demo.gasp.activity.TwitterStreamActivity;
import com.appdynamics.demo.gasp.service.RESTIntentService;
import com.appdynamics.demo.gasp.twitter.TwitterAPI;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import java.util.ArrayList;
import java.util.List;

/**
 * Closely modeled on Neil Goodman's Android REST tutorials
 * https://github.com/posco2k8/rest_service_tutorial
 * https://github.com/posco2k8/rest_loader_tutorial.git
 *
 * @author Mark Prichard
 */
public class TwitterResponderFragment extends RESTResponderFragment {
    private static final String TAG = TwitterResponderFragment.class.getName();

    private List<String> mTweets;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        setTweets();
    }

    private void setTweets() {
        TwitterStreamActivity activity = (TwitterStreamActivity) getActivity();

        try {
            // Get Twitter search keyword from Shared Preferences
            SharedPreferences gaspSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
            String keyword = gaspSharedPreferences.getString(getString(R.string.gasp_twitter_preferences), "");

            if (mTweets == null) {
                Intent intent = new Intent(activity, RESTIntentService.class);
                intent.setData(Uri.parse(TwitterAPI.getTwitterApiSearch()));

                Bundle params = new Bundle();
                params.putString("q", keyword);
                params.putString("count", "10");

                Bundle headers = new Bundle();
                headers.putString("Authorization", "Bearer " + TwitterStreamActivity.getTwitterOAuthToken());

                intent.putExtra(RESTIntentService.EXTRA_PARAMS, params);
                intent.putExtra(RESTIntentService.EXTRA_HEADERS, headers);
                intent.putExtra(RESTIntentService.EXTRA_RESULT_RECEIVER, getResultReceiver());

                activity.startService(intent);
            } else if (activity != null) {
                ArrayAdapter<String> adapter = activity.getArrayAdapter();

                adapter.clear();
                for (String tweet : mTweets) {
                    adapter.add(tweet);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onRESTResult(int code, String result) {
        if (code == 200 && result != null) {
            mTweets = getTweetsFromJson(result);
            setTweets();
        } else {
            Activity activity = getActivity();
            if (activity != null) {
                Toast.makeText(activity, getResources().getString(R.string.gasp_twitter_error), Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }

    private static List<String> getTweetsFromJson(String json) {
        ArrayList<String> tweetList = new ArrayList<String>();

        try {
            JSONObject tweetsWrapper = (JSONObject) new JSONTokener(json).nextValue();
            JSONArray tweets = tweetsWrapper.getJSONArray("statuses");

            for (int i = 0; i < tweets.length(); i++) {
                JSONObject tweet = tweets.getJSONObject(i);
                Log.d(TAG, "Tweet: " + tweet.getString("text"));
                tweetList.add(tweet.getString("text"));
            }
        } catch (JSONException e) {
            Log.e(TAG, "Failed to parse JSON.", e);
        }

        return tweetList;
    }

}