Using XMPP for user location

Question

I want to create an Android application that will allow me to get the user's geolocation. This should be done as a client-server application, and for the server side I use OpenFire. To get the user's location, I have to use the XEP-0080, right? And SmackAPI too? I am completely new to XMPP and Smack, so if anyone could get me some pointers or maybe examples or any documentation about this, I would be very grateful.

Thanks in advance for your help.

Answer 1

I believe this is close to what you are trying to accomplish.

Location of user XEP-0080 in the Smack library

Answer 2

The Android Im project is currently working on the need to periodically publish user locations to its XMPP member friends using aSmack and XEP-0080.

This turned out to be more complicated than I would like, so I registered my decision here: http://www.dbotha.com/2014/11/02/xep-0080-user-location-on-android-using-pep-with -smack /

For completeness, I will talk about the important parts here. In the interest of brevity, the only XML child elements in the XEP-0080 specification that span Ill are latitude and longitude.

PEPItem to hold the user's location and convert it to the corresponding XML:

public class UserLocation extends PEPItem { public static final String NODE = "http://jabber.org/protocol/geoloc"; public final double latitude, longitude; public UserLocation(double latitude, double longitude) { this(StringUtils.randomString(16), latitude, longitude); } public UserLocation(double latitude, double longitude, String id) { super(id); this.latitude = latitude; this.longitude = longitude; } @Override java.lang.String getNode() { return NODE; } // return an XML element approximately inline // with the XEP-0080 spec @Override java.lang.String getItemDetailsXML() { return String.format( "<geoloc xmlns='%s'><lat>%f</lat>" + "<lon>%f</lon></geoloc>", NODE, latitude, longitude); } } 

Basically template PEPEvent for storing PEPItemLocation UserLocation:

 public class UserLocationEvent extends PEPEvent { private final UserLocation location; public UserLocationEvent(UserLocation location) { this.location = location; } public UserLocation getLocation() { return location; } @Override public String getNamespace() { return "http://jabber.org/protocol/pubsub#event"; } @Override public String toXML() { return String.format("<event xmlns=" + "'http://jabber.org/protocol/pubsub#event' >" + "<items node='%s' >%s</items></event>", UserLocation.NODE, location.toXML()); } } 

Custom PacketExtensionProvider to parse the UserLocationEvent user from incoming packages.

 public class UserLocationProvider implements PacketExtensionProvider { // This method will get called whenever aSmack discovers a // packet extension containing a publish element with the // attribute node='http://jabber.org/protocol/geoloc' @Override public PacketExtension parseExtension(XmlPullParser parser) throws Exception { boolean stop = false; String id = null; double latitude = 0; double longitude = 0; String openTag = null; while (!stop) { int eventType = parser.next(); switch (eventType) { case XmlPullParser.START_TAG: openTag = parser.getName(); if ("item".equals(openTag)) { id = parser.getAttributeValue("", "id"); } break; case XmlPullParser.TEXT: if ("lat".equals(openTag)) { try { latitude = Double.parseDouble( parser.getText()); } catch (NumberFormatException ex) { /* ignore */ } } else if ("lon".equals(openTag)) { try { longitude = Double.parseDouble( parser.getText()); } catch (NumberFormatException ex) { /* ignore */ } } break; case XmlPullParser.END_TAG: // Stop parsing when we hit </item> stop = "item".equals(parser.getName()); openTag = null; break; } } return new UserLocationEvent( new UserLocation(id, latitude, longitude)); } } 

Now tying it all together:

 XMPPTCPConnection connection = new XMPPTCPConnection(); ServiceDiscoveryManager sdm = ServiceDiscoveryManager .getInstanceFor(connection); sdm.addFeature("http://jabber.org/protocol/geoloc"); sdm.addFeature("http://jabber.org/protocol/geoloc+notify"); EntityCapsManager capsManager = EntityCapsManager .getInstanceFor(connection); capsManager.enableEntityCaps(); PEPProvider pepProvider = new PEPProvider(); pepProvider.registerPEPParserExtension( "http://jabber.org/protocol/geoloc", new UserLocationProvider()); ProviderManager.addExtensionProvider("event", "http://jabber.org/protocol/pubsub#event", pepProvider); PEPManager pepManager = new PEPManager(connection); pepManager.addPEPListener(PEP_LISTENER); connection.connect(); connection.login(username, password); 

And finally, a listener for LocationEvent's inbox:

 PEPListener PEP_LISTENER = new PEPListener() { @Override public void eventReceived(String from, PEPEvent event) { if (event instanceof UserLocationEvent) { // do something interesting } } };