Android Open Source - hacktoolkit-android_lib H T K User

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License

The source code is released under:

MIT License

Java Source Code

package com.hacktoolkit.android.user;
//from   ww  w . j  av a2  s  .c o m
import java.util.Date;

import com.facebook.Request;
import com.facebook.Response;
import com.facebook.model.GraphUser;
import com.hacktoolkit.android.constants.TimeConstants;
import com.hacktoolkit.android.maps.MapUtils;
import com.parse.ParseFacebookUtils;
import com.parse.ParseGeoPoint;
import com.parse.ParseUser;

/**
 * HTKUser
 * 
 * Represents the user of this app, and acts as a wrapper for ParseUser
 * @author Hacktoolkit
 *
 */
public class HTKUser {
  public static HTKUser getCurrentUser() {
    ParseUser parseUser = ParseUser.getCurrentUser();
    HTKUser user = getCurrentUser(parseUser);
    return user;
  }
  public static HTKUser getCurrentUser(ParseUser parseUser) {
    HTKUser user = new HTKUser(parseUser);
    return user;
  }
  
  public static void logout() {
    ParseUser.logOut();
  }
  
  private ParseUser parseUser;
  public static final long LOCATION_UPDATE_THRESHOLD = 3 * TimeConstants.ONE_MINUTE_MILLIS;
  public static final int MOVEMENT_THRESHOLD_METERS = 25;
  
  public HTKUser(ParseUser parseUser) {
    this.parseUser = parseUser;
  }
  
  public boolean isAuthenticated() {
    boolean auth = false;
    if (parseUser != null) {
      auth = parseUser.isAuthenticated();
    }
    return auth;
  }
  
  public String getName() {
    String firstName = parseUser.getString("firstName");
    String lastName = parseUser.getString("lastName");
    StringBuffer sb = new StringBuffer();
    sb.append(firstName);
    if (firstName != null && !firstName.equals("")) {
      sb.append(" ");
      sb.append(lastName);
    }
    String name = sb.toString();
    return name;
  }
  
  public void updateWithGraphUser() {
    Request.newMeRequest(ParseFacebookUtils.getSession(), new Request.GraphUserCallback() {
      @Override
      public void onCompleted(GraphUser user, Response response) {
        if (user != null) {
          String fbId = user.getId();
          String firstName = user.getFirstName();
          String lastName = user.getLastName();
          String email = (String) user.getProperty("email");
          parseUser.put("fbId", fbId);
          parseUser.put("firstName", firstName);
          parseUser.put("lastName", lastName);
          parseUser.put("email", email);
          parseUser.saveEventually();
        }
      }
    }).executeAsync();
  }
  
  /**
   * updateLocation
   * 
   * @param latitude
   * @param longitude
   * @param forceUpdate whether we should force an update
   * @return true if location was updated, false otherwise
   */
  public boolean updateLocation(double latitude, double longitude, boolean forceUpdate) {
    boolean updated = false;
    if (forceUpdate || shouldUpdateLocation(latitude, longitude)) {
      ParseGeoPoint geoPoint = new ParseGeoPoint(latitude, longitude);
      parseUser.put("location", geoPoint);
      parseUser.put("locationLastUpdatedAt", new Date());
      parseUser.saveEventually();
      updated = true;
    }
    return updated;
  }
  
  /**
   * 
   * @param latitude
   * @param longitude
   * @return true if the user's location should be updated
   */
  private boolean shouldUpdateLocation(double latitude, double longitude) {
    boolean shouldUpdate = isSignificantMovement(latitude, longitude) &&
          hasLocationUpdateThresholdElapsed();
    return shouldUpdate;
  }
  
  /**
   * Helps determine whether an update should happen
   * @param latitude
   * @param longitude
   * @return true if the new coordinates represent a significant movement
   */
  private boolean isSignificantMovement(double newLatitude, double newLongitude) {
    double previousLatitude = parseUser.getDouble("latitude");
    double previousLongitude = parseUser.getDouble("longitude");
    boolean significantMovement = false;
    if (previousLatitude == 0 && previousLongitude == 0) {
      significantMovement = true;
    } else {
      double distanceKm = MapUtils.geographicalGreatCircleDistance(previousLatitude, previousLongitude, newLatitude, newLongitude);
      significantMovement = distanceKm / 1000 > MOVEMENT_THRESHOLD_METERS;
    }
    return significantMovement;
  }
  
  /**
   * Helps determine whether an update should happen
   * Essentially rate-limits the number of updates
   * @return true if LOCATION_UPDATE_THRESHOLD has elapsed
   */
  private boolean hasLocationUpdateThresholdElapsed() {
    long sinceLastUpdate = 0;
    Date locationLastUpdatedAt = parseUser.getDate("locationLastUpdatedAt");
    Date now = new Date();
    boolean elapsed = false;
    if (locationLastUpdatedAt == null) {
      elapsed = true;
      sinceLastUpdate = 0;
    } else {
      sinceLastUpdate = now.getTime() - locationLastUpdatedAt.getTime();
      if (sinceLastUpdate > LOCATION_UPDATE_THRESHOLD) {
        elapsed = true;
      }
    }
    return elapsed;
  }
}

Java Source Code List

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