Android Open Source - Toury-Glass Geofence Manager

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License

The source code is released under:
MIT License
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Java Source Code

package twilight.of.the.devs.utils;
//from   w w  w  .j  a  v a  2  s  .co  m
import java.util.HashMap;
import java.util.List;

import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;

import twilight.of.the.devs.mylibrary.MARKER_STATE;
import twilight.of.the.devs.mylibrary.Marker;

/*
 * Manages Geofences
 */
public class GeofenceManager {
  
  private static final String TAG = GeofenceManager.class.getName();
  private HashMap<Marker, MarkerInfo> markerMap;
  private Context context;
  private long timeSinceLastCheck;
  
  /*
   * MarkerInfo is used in the hashmap to keep track of markers that we have previously broadcasted.
   * We only want to get notified of markers that we haven't previously been notified of.
   */
  private class MarkerInfo {
    public long dwellTime;
    public boolean inside;
    public boolean hasBroadcasted;
    public MarkerInfo(long dwellTime, boolean inside){
      this.dwellTime = dwellTime;
      this.inside = inside;
    }
    public void addTime(long time){ dwellTime += time;}
  }

  /*
   * Setup the geofencemanager with a list of markers.
   */
  public GeofenceManager(List<Marker> markers, Context context){
    this.context = context;
    markerMap = new HashMap<Marker, MarkerInfo>();
    for(Marker marker : markers){
      markerMap.put(marker, new MarkerInfo(0L, false));
    }
    timeSinceLastCheck = System.currentTimeMillis();
  }
  
  /*
   * Set the marker hashmap based on a list of markers
   */
  public void setMarkerList(List<Marker> list){
    markerMap = new HashMap<Marker, MarkerInfo>();
    for(Marker marker : list){
      markerMap.put(marker, new MarkerInfo(0L, false));
    }
  }
  
  /*
   * Checks whether a user is within the radius of a geofence
   * @param location the user's current location
   * Sends a broadcast depending of the user's location
   */
  public void checkGeofences(Location location){
    
    //Get the current time so we can check for DWELLING state
    long currentTime = System.currentTimeMillis();
    long diff = currentTime - timeSinceLastCheck;
    synchronized (markerMap) {

      for(Marker marker : markerMap.keySet()){
        markerMap.get(marker).addTime(diff);
        boolean inside = isWithInGeofence(marker, location);
        
        //If the user is inside the radius and the user was not previously inside...
        if(inside && !markerMap.get(marker).inside){
          MARKER_STATE type = MARKER_STATE.ENTERED;
          markerMap.put(marker, new MarkerInfo(0L, true));
          Intent i = new Intent("geofence");
          i.putExtra("type", type);
          i.putExtra("marker", marker);
          LocalBroadcastManager.getInstance(context).sendBroadcast(i);
          
        } else if (!inside && markerMap.get(marker).inside){ //if the user is not inside but WAS previously...
          MARKER_STATE type = MARKER_STATE.EXITED;
          markerMap.put(marker, new MarkerInfo(0L, false));
          Intent i = new Intent("geofence");
          i.putExtra("type", type);
          i.putExtra("marker", marker);
          LocalBroadcastManager.getInstance(context).sendBroadcast(i);
          
        } else if (inside && markerMap.get(marker).inside && markerMap.get(marker).dwellTime > 5 * 1000 && !markerMap.get(marker).hasBroadcasted){
          //if the user is inside and the user WAS previously inside AND the user has been inside for at least 5 seconds and we haven't broadcasted yet...
          MARKER_STATE type = MARKER_STATE.DWELLING;
          markerMap.get(marker).hasBroadcasted = true;
          Intent i = new Intent("geofence");
          i.putExtra("type", type);
          i.putExtra("marker", marker);
          LocalBroadcastManager.getInstance(context).sendBroadcast(i);
        }
      }
    
    }
    timeSinceLastCheck = currentTime;
  }
  
  /*
   * Check whether a user is inside of a marker radius
   * @param marker a toury marker
   * @param location the user's current location
   */
  private boolean isWithInGeofence(Marker marker, Location location){
    
    Location markerLoc = new Location(location);
    markerLoc.setLatitude(marker.getMarkerLatitude());
    markerLoc.setLongitude(marker.getMarkerLongitude());
    float distance[] = {0.0f, 0.0f};
    Location.distanceBetween(location.getLatitude(), location.getLongitude(), marker.getMarkerLatitude(), marker.getMarkerLongitude(), distance);

    if(distance[0] < marker.getRadius()){
      return true;
    }
    
    return false;
  }
  
}
Java Source Code List
