Java Reference
In-Depth Information
Doing this triggers another event, but this time on the requestor:
public void friendRequestAccepted(Friend from)
{
console.println("Friend request accepted!", Console.GREEN);
// set the presence
setPresenceStatus(from);
}
We are told that our request was accepted, and therefore we can
send our Presence information to our new friend. In subsequent logins,
this friend's information is included in the
Friend[]
array passed
to the application on the successful login event handler. In all cases,
whenever we receive some presence information from a friend, the
friendPresenceChanged()
method is invoked; we can then use the
information passed as a parameter to make any necessary display or status
changes in our side of the application.
Testing the Presence example is a bit of work, but is not complex.
First, browse to the
samples
\
SampleApps
\
dist
folder of the SNAP
Mobile SDK installation. You will see two versions of this example:
Presence.jad
and
Presence2.jad
. The first is configured with
username
,
password
and
friendname
parameters, which means it
will log in and try to add
friendname
as a friend. The second is
configured with
username
and
password
only, which means it will
not invite anybody to be a friend. However, its
username
parameter is
configured as
friendname
in the first version, meaning that the friend
request sent by the first is handled by the second instance of the Presence
application.
Open the
Presence2.jad
application in your emulator. The appli-
cation logs in to the SNAP Mobile server and waits for events. Open a
second instance of the emulator, executing the
Presence.jad
applica-
tion. It sees the
friendname
parameter configured and proceeds to add it
as a friend, setting the presence information and then logs out. Figure B.7
shows both applications running on the Sun WTK client emulator.
B.5.5 Instant Messaging
This final example demonstrates how to send and receive instant messages
to and from friends. The Instant Messaging and Presence examples
combined can be used as a basis for powerful games enabled with instant
messaging to run on the SNAP Mobile community server.
After logging in, one instance of the application looks for friends in the
Friend[]
parameter passed by the
loginSingleSignonSuccess()
callback method. If we find some, it proceeds to send messages to the
first friend in the list (
friend[0]
), using the
sendMessage()
method:
