Android Open Source - interdroid-swan Twitter Sensor

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License

The source code is released under:

Copyright (c) 2008-2011 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

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Java Source Code

package interdroid.swan.sensors.impl;
//  ww w.  j a  v  a  2  s .  com
import interdroid.swan.R;
import interdroid.swan.sensors.AbstractConfigurationActivity;
import interdroid.swan.sensors.AbstractMemorySensor;

import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.DocumentBuilderFactory;

import org.scribe.builder.ServiceBuilder;
import org.scribe.builder.api.TwitterApi;
import org.scribe.model.OAuthRequest;
import org.scribe.model.Response;
import org.scribe.model.Token;
import org.scribe.model.Verb;
import org.scribe.oauth.OAuthService;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;

import android.os.Bundle;

/**
 * Based on the original TwitterSensor written by Rick de Leeuw
 *
 * @author rkemp
 */
public class TwitterSensor extends AbstractMemorySensor {

  public static final String TAG = "Twitter";

  public static class ConfigurationActivity extends
      AbstractConfigurationActivity {

    @Override
    public int getPreferencesXML() {
      return R.xml.twitter_preferences;
    }

  }

  public static final String NR_MENTIONS_FIELD = "mentions";

  public static final String SAMPLE_INTERVAL = "sample_interval";
  public static final String ACCESS_TOKEN = "access_token";
  public static final String SECRET_ACCESS_TOKEN = "secret_access_token";

  public static final long DEFAULT_SAMPLE_INTERVAL = 5 * 60 * 1000;

  protected static final int HISTORY_SIZE = 10;

  // Buienradar specific variables
  private static final String API_KEY = "uKfdGc8DLZ7FBnZAePGg";
  private static final String API_SECRET = "NeDCR2mdMGJVeaBz7wL0R5V3rX7QviOb9IsIFpByY";
  private static final String MENTION_URL = "http://api.twitter.com/1/statuses/mentions.xml?trim_user=1";

  private static final OAuthService OAUTH_SERVICE = new ServiceBuilder()
      .provider(TwitterApi.class).apiKey(API_KEY).apiSecret(API_SECRET)
      .build();

  private Map<String, TwitterPoller> activeThreads = new HashMap<String, TwitterPoller>();

  private int sampleTwitter(Token accessToken) {
    OAuthRequest request = new OAuthRequest(Verb.GET, MENTION_URL);
    OAUTH_SERVICE.signRequest(accessToken, request); // the access token
                              // from step
    // 4
    Response response = request.send();
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    try {
      Document doc = factory.newDocumentBuilder().parse(
          response.getBody());
      NodeList mentions = doc.getElementsByTagName("status");
      return mentions.getLength();
    } catch (Exception e) {
      return -1;
    }

  }

  @Override
  public String[] getValuePaths() {
    return new String[] { NR_MENTIONS_FIELD };
  }

  @Override
  public void initDefaultConfiguration(Bundle DEFAULT_CONFIGURATION) {
    DEFAULT_CONFIGURATION.putLong(SAMPLE_INTERVAL, DEFAULT_SAMPLE_INTERVAL);
  }

  //@Override
  public String getScheme() {
    return "{'type': 'record', 'name': 'rain', 'namespace': 'context.sensor',"
        + " 'fields': ["
        + "            {'name': '"
        + NR_MENTIONS_FIELD
        + "', 'type': 'integer'}"
        + "           ]"
        + "}".replace('\'', '"');
  }

  @Override
  public void onConnected() {
  }

  @Override
  public final void register(String id, String valuePath, Bundle configuration) {
    TwitterPoller twitterPoller = new TwitterPoller(id, valuePath,
        configuration);
    activeThreads.put(id, twitterPoller);
    twitterPoller.start();
  }

  @Override
  public final void unregister(String id) {
    activeThreads.remove(id).interrupt();
  }

  class TwitterPoller extends Thread {

    private Bundle configuration;
    private String valuePath;
    private String id;

    TwitterPoller(String id, String valuePath, Bundle configuration) {
      this.id = id;
      this.configuration = configuration;
      this.valuePath = valuePath;
    }

    public void run() {
      Token token = new Token(configuration.getString(ACCESS_TOKEN),
          configuration.getString(SECRET_ACCESS_TOKEN));
      while (!isInterrupted()) {
        long start = System.currentTimeMillis();
        int mentions = sampleTwitter(token);
        if (mentions >= 0) {
          putValueTrimSize(valuePath, id, start, mentions,
              HISTORY_SIZE);
        }

        try {
          Thread.sleep(Math.max(
              0,
              configuration.getLong(SAMPLE_INTERVAL,
                  mDefaultConfiguration
                      .getLong(SAMPLE_INTERVAL))
                  + start - System.currentTimeMillis()));
        } catch (InterruptedException e) {
        }
      }
    }

  }

  @Override
  public void onDestroySensor() {
    for (TwitterPoller twitterPoller : activeThreads.values()) {
      twitterPoller.interrupt();
    }
  };

}

Java Source Code List