android GCM Receive Messages from Multiple devices - broadcastreceiver

Question

i am building a chat application with the help of GoogleCloudMessaging(GCM).i am able to send and receive messages. my problem is when i receive messages from multiple devices at the same time, all those messages are appended to the same list-view in my broadcast receiver class. how can i separate the message based on the senders and append the current chat message to the listview. and make separate notifications for other messages based on the senders and when i click on the notification it should open the same list view with messages according to sender.
can any one give me an efficient way of doing this.if you have any sample code to handle this situation please post the code.
My current code:
public class Serious extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action=intent.getAction();
if (action.equals("com.google.android.c2dm.intent.REGISTRATION"))
{
String registrationID=intent.getStringExtra("registration_id");
// Log.i("uo",registrationID);
String error=intent.getStringExtra("error");
String unregisterd=intent.getStringExtra("unregistered");
}
else if(action.equals("com.google.android.c2dm.intent.RECEIVE"))
{
String data1=intent.getStringExtra("data1");
String data2=intent.getStringExtra("data2");
addNewMessage(new Message(data2, false));
/* PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
new Intent(context, MainActivity.class), 0);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("My Notification")
.setDefaults(Notification.DEFAULT_SOUND)
.setAutoCancel(true)
.setContentText(data1+data2);
mBuilder.setContentIntent(contentIntent);
NotificationManager mNotificationManager =
(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(1, mBuilder.build());*/
}
}
void addNewMessage(Message m)
{
MainActivity.messages.add(m);
MainActivity.adapter.notifyDataSetChanged();
//MainActivity.getListView().setSelection(MainActivity.messages.size()-1);
}
}

Answer 1

You should pass in your gcm message a parameter that contains the sender id. Then, when you handle the arrived message, use that sender id to decide where to add that message. In order to show multiple notifications, pass different int values to notify. Currently you always pass 1, so a new notification overrides the old one.