Hallo everybody,
I have just programmed a chat application to be applied to Android
(SDK m5-rc15) and to as many browsers as possible.
At present I am exploiting only the GWT (1.5.1) API, with the 'smack'
library which allows connection to a xmpp server. (For now I'm using
just Firefox as XMPP server and a Spark client).
I have a big problem: my application works perfectly with many
browsers (Chrome, IE, Mozilla, Opera), but it does not work so well on
Android.
In fact, on Android I cannot send and receive real-time messages:
sometimes I lose message, sometimes the message I send from one side
(for example from the Spark client) appears on the other side, that is
on my application running on Android, only after sending a further
message from my application itself.
My question is : why does my application not work only with Android??
Do I have to change any configuration parameter on Android for that?
Some further information about the webapp architecture:
1) In my application the application server opens a connection to a
XMPP server, before opening a chat to any
Spark client.
2) On my server-side I have 4 chat methods,which I invoke from the
client by means of RPC calls.
Since no flush is allowed by the http protocol, actually I am
appending all received message to a inbox list
(by means of a message listener in the chat method). The client
receives this messages invoking the receive
method on server-side.
Here I attach the four chat methods:
public boolean connect() {
try {
connection.connect();
connection.login(username,psw);
} catch (XMPPException e) {
e.printStackTrace();
return false;
}
return true;
}
public boolean chat(String participant){
participantName = participant.substring(0,
participant.lastIndexOf('@'));
this.chat1 =
connection.getChatManager().createChat(participant, new
MessageListener() {
public void processMessage(Chat chat1,
Message message) {
msg = participantName + ": " +
message.getBody();
System.out.println("Received
message --> " + msg);
synchronized(messageList){
messageList.add(msg);
messageList.notify();
}
}
});
return true;
}
public String send(String textIn) {
try {
chat1.sendMessage(textIn);
} catch (XMPPException e) {
e.printStackTrace();
}
textOutMod = username + ": " + textIn;
return textOutMod;
}
public String receive() {
synchronized (messageList){
while (messageList.size() == 0){
try{
messageList.wait();
} catch (InterruptedException
ignore){
}
}
textInMod = "";
for (int j = 0; j < messageList.size(); j++) {
if (textInMod.length() > 0) textInMod = textInMod +
"\n" + messageList.elementAt(j);
else textInMod =
(String)messageList.elementAt(j);
}
messageList.clear();
}
return textInMod;
}
thks in advance and sorry for bad English,
Steve
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