TwitterData.java

package org.smartpaws.net;

import android.util.Log;

import com.loopj.android.http.AsyncHttpResponseHandler;

import org.apache.http.Header;
import org.smartpaws.MainActivity;
import org.smartpaws.objects.twitter.Authenticated;
import org.smartpaws.objects.twitter.Tweet;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class TwitterData {

    private static final String TWITTER_TOKEN_URL = "https://api.twitter.com/oauth2/token";
    private static final String TWITTER_STREAM_URL = "https://api.twitter.com/1.1/statuses/user_timeline.json?count=50&exclude_replies=true&screen_name=";

    private static volatile int count = 0;

    public static void getTweets(final String authEncoded, final String[] accounts, final ResponseHandler<Tweet[]> response) {
        final List<Tweet> results = new ArrayList<>();
        for (String account : accounts) {
            getTweets(authEncoded, account, new ResponseHandler<Tweet[]>() {
                @Override
                public void result(Tweet[] result) {
                    if (result == null) {
                        response.result(null);
                        return;
                    }
                    Collections.addAll(results, result);
                    TwitterData.count++;
                    if (count == accounts.length) {
                        response.result(results.toArray(new Tweet[results.size()]));
                    }
                }
            });
        }
    }

    public static void getTweets(final String authEncoded, final String account, final ResponseHandler<Tweet[]> response) {
        HttpClient.postOAuthUrl(TWITTER_TOKEN_URL, authEncoded, null, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                String rawAuthorization = new String(responseBody, Charset.forName("UTF-8"));
                Authenticated auth = DataMan.GSON_TWITTER.fromJson(rawAuthorization, Authenticated.class);

                if (auth != null && auth.token_type.equals("bearer")) {
                    HttpClient.getOAuthUrl(TWITTER_STREAM_URL + account, auth.access_token, null, new AsyncHttpResponseHandler() {
                        @Override
                        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                            response.result(DataMan.GSON_TWITTER.fromJson(new String(responseBody, Charset.forName("UTF-8")), Tweet[].class));
                        }

                        @Override
                        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
                            Log.e(MainActivity.APP_NAME, "Failed to retrieve tweets", error);
                            response.result(null);
                        }
                    });
                }
            }

            @Override
            public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
                Log.e(MainActivity.APP_NAME, "Failed to authenticate Twitter", error);
                response.result(null);
            }
        });
    }
}