I’m trying to implement a chat client for Android which connects to google talk service. I have done most of it, I connect to the server, I get contacts (and show them in a ListView) and I open a new Activity when clicking a contact name on the list where the messages are send and received. My problem is that now I’m trying to get the Presence of the contacts of a user’s account. I have written this code but it is not working and I’m not able to discover why. Any help is appreciated.
Button connect = (Button) findViewById(R.id.connect);
connect.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
String username = getTheText(R.id.UserName);
String password = getTheText(R.id.Password);
login(username, password);
try {
Thread.sleep(5000);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
roster = connection.getRoster();
entries = roster.getEntries();
arrayOfEntries = new ArrayList<RosterEntry>(entries);
searchedContacts = GetSearchContacts();\\This method is the one who is not working correctly
try{
launchNextActivity();
}catch(Exception e){
e.printStackTrace();
}
}
});
/*
* Asigna los datos del ArrayList de RosterEntry al ArraList de SearchContacts
*/
private ArrayList<SearchContacts> GetSearchContacts(){
ArrayList<SearchContacts> results = new ArrayList<SearchContacts>();
\\The class SearchContacts is an own class very simple with a constructor which assigns 4 parameters to the objects of the class, and getters and setters for every parameter.
for (RosterEntry r : arrayOfEntries){
SearchContacts sc = new SearchContacts(null, null,null,null);
sc.setNick(r.getName());
sc.setEmail(r.getUser());
roster.setSubscriptionMode(Roster.SubscriptionMode.accept_all);
prs = roster.getPresence(r.getUser());
Presence.Mode presence2 = prs.getMode();
status = ConvierteEnumToString(presence2);
sc.setFirstSentence(status);
results.add(sc);
}
return results;
}
\*
*
*\
private void ConvierteEnumToString(Presence.Mode pm){
switch(pm){
case available:
Log.i(LOGTAG,"Case Available");
status= "Available";
break;
case away:
Log.i(LOGTAG,"Case away");
status= "Away";
break;
case chat:
Log.i(LOGTAG,"Case chat");
status= "chat";
break;
case dnd:
Log.i(LOGTAG,"Case dnd");
status= "Do not disturb";
break;
case xa:
Log.i(LOGTAG,"Case xa");
status= "Unavailable";
break;
default:
Log.i(LOGTAG,"Invalid status");
status="Invalid";
break;
}
}
If I change the attribute of this line:
String status = ConvierteEnumToString(presence2);
and I put directly Presence.Mode.available, it assigns the status available to all of my contacts but it works correctly. If I let it as it is in the code above I get an Exception like this:
04-10 23:11:02.866: W/dalvikvm(1722): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-10 23:11:02.886: E/AndroidRuntime(1722): FATAL EXCEPTION: main
04-10 23:11:02.886: E/AndroidRuntime(1722): java.lang.NullPointerException
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.chat.Login.GetSearchContacts(Login.java:164)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.chat.Login.access$1(Login.java:153)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.chat.Login$1.onClick(Login.java:81)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.view.View.performClick(View.java:2485)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.view.View$PerformClick.run(View.java:9080)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.os.Handler.handleCallback(Handler.java:587)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.os.Handler.dispatchMessage(Handler.java:92)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.os.Looper.loop(Looper.java:123)
04-10 23:11:02.886: E/AndroidRuntime(1722): at android.app.ActivityThread.main(ActivityThread.java:3683)
04-10 23:11:02.886: E/AndroidRuntime(1722): at java.lang.reflect.Method.invokeNative(Native Method)
04-10 23:11:02.886: E/AndroidRuntime(1722): at java.lang.reflect.Method.invoke(Method.java:507)
04-10 23:11:02.886: E/AndroidRuntime(1722): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-10 23:11:02.886: E/AndroidRuntime(1722): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-10 23:11:02.886: E/AndroidRuntime(1722): at dalvik.system.NativeStart.main(Native Method)
With the difference that I sometimes get One user status and then the Exception occurs and sometimes no status is got at all.
Thank you very much for your help!
I have discovered the problem. I add the solution here to whom it may concern.
The problem was that when this line is executed:
Presence.Mode presence2 = prs.getMode();
one of the possible values that presence2 can get is null. So you are passing a null variable to a try/catch structure which was waiting for a Presence.Mode presence variable… Thats why a NullPointerException is got.
I have added an if clause just after that line which test if the variable presence2 is equals to null and if it happens it changes it somehow. I suppose it can also be done surrounding the line with a try/catch structure and treating the NullPointerException somehow.
I hope it can help to anyone at least to not waste time thinking a solution for this!