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Stacking notifications from GCM is not working with setGroup

I have the following notification logic inside a class that extends GcmListenerService, and gets called when one notification arrives. Then, when clicked, the app takes you to MainActivity where the notification is displayed properly.
public static void mostrarAvisoBarraEstado(Context context, String alerts)
{
Intent notificationIntent = new Intent(context.getApplicationContext(), MainActivity.class);
notificationIntent.putExtra("alerts", alerts);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(context, new Random().nextInt(),
notificationIntent, 0);
NotificationManager notificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = new NotificationCompat.Builder(context)
.setContentTitle(context.getString(R.string.app_name))
.setContentText("Alert received")
.setSmallIcon(R.drawable.nubeazul)
.setOnlyAlertOnce(true)
.setContentIntent(pendingIntent)
.setWhen(System.currentTimeMillis())
.setGroup(GRUPO_ALERTAS)
.setGroupSummary(true)
.setAutoCancel(true)
.build();
//notificationManager.notify(0, notification);
notificationManager.notify (new Random().nextInt(), notification);
}
So, right now, each one is displayed separately, and if they build up, the result is rather ugly with all the notification bar full of little icons. Can you guys help for an elegant solution since I am kindda new to Android? Thanks a lot!
NEW STUFF ADDED today!
If I take the notify random out, leaving something like notificationManager.notify(0, notification);, I will get just one notification, but nothing else, then when it launches MainActivity (its onResume() method) it will only display one notification and all the "piled up ones" are just discarded when clicked on the one notification. What I want to achieve is that while maintaining a clean display, i.e: one group notification for all GCM, if I click on the group, I will get each and every notification displayed throught the Alerts.class (something like looping through the notifications, and starting the activity Alerts for each one.
#Override
protected void onResume()
{
super.onResume();
if (getIntent().hasExtra("alerts"))
{
Bundle extras = getIntent().getExtras();
Intent intent = new Intent(this, Alerts.class);
intent.putExtra("alerts" , extras.getString("alerts"));
startActivity(intent);
getIntent().removeExtra("alerts");
}
}
Then the Alerts class will nicely display the alert which it does, but one per notification.

So I tried out your code and managed to see reproduce what you were encountering (I just manually created dummy notifications). So the reason that the Notifications were piling up was because the id you are passing in the notificationManager.notify() is different from one another. As to what I have observed on the Notification and NotificationManagers behavior so far, the id indicated in notify() it kinda represents the id location/position (not sure what to call it) of the Notification that is under the NotificationManager, not an id of the Notification itself.
Imagine the NotificationManager as an array or list. If for example, you have 3 visible notifications on the Status Bar:
Notification 1, Notification 2, Notification 3 and their ids are as follows: 0, 1, 2.
If you generate a new Notification 4 then called notify passing it as a parameter, and the id 1, the notifications that will be currently shown in the NotificationManager would result to something like this:
Notification 1, Notification 4, Notification 3 and their ids are as follows: 0, 1, 2.
So the reason that you're notifications are piling up and NOT grouping together is because you end up with different ids when calling notify() while passing new Random().nextInt().
As per the behavior that I think you are aiming for -- Joining the notifications from your app into one -- the implementation is simple when understood, but I think it's still a little bit tricky. It's like you have to check first if there is more than 1 notification already, then if yes, you create a summary notification with the details and you show it alone (mind the id ;)) and all of those other stuff. I found this blog though that I think might help you with it. Or you can simply just check out the official docs on Stacking Notifications.
So bottom line, simply use a single id to pass in notify() when it comes to your apps Notifications. Hope this helps. Cheers! :D

Android Notification click won't open same activity with different intent data

I'm configuring my notifications to open a new instance of ActivityDetail on click:
Intent resultIntent = new Intent(getApplicationContext(), ActivityDetail.class);
resultIntent.putExtra("object_id", objectId);
...
TaskStackBuilder stackBuilder =TaskStackBuilder.create(getApplicationContext());
stackBuilder.addNextIntentWithParentStack(resultIntent);
resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(0, PendingIntent.FLAG_CANCEL_CURRENT);
I build each notifications with a different id, as clicking will populate the ActivityDetail with results unique to the notification.
When I receive two notifications, the first one will open ActivityDetail correctly. Clicking the second notification, however, does nothing (except dismiss it), whether I remain on the ActivityDetail screen or not. Specifying the activity launch mode as "singleTop" makes no difference.
I don't seem to have any problems if there is only one notification displayed at a time, but if there are two, the second one always fails to open a new instance of the ActivityDetail on click. Any help would be appreciated.

I think this is happening because you are sending static request code '0' in 'getPendingIntent' method while obtain pending intent. send a separate value for each notification instead of '0'. it will work.
You need to do like this:
PendingIntent resultPendingIntent =stackBuilder.getPendingIntent(SEPARATE_INT_VALUE, PendingIntent.FLAG_CANCEL_CURRENT);
// Now change value of 'SEPARATE_INT_VALUE'

Android Notification Update for same notification id

I am using the same notification id to show the notification of my app.
I am passing an object with the intent to launch the activity.
The issue is for same notification id, android caches the initial object which is passed along the intent.
So how can I make sure that the latest object is added in the intent.
Or how can I check if a notification with the id is not cleared in the notification panel and if it's there then I can delete the notification and create a new one.
Note :- I want to avoid the scenario to use new notification id as that keeps creating new notification without removing the older ones.

Use PendingIntent.FLAG_UPDATE_CURRENT in your Pending Intent like below
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
NotificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

call notificationManager.cancel(NOTIFICATION_ID); before calling notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());

Push Notification Onclick it should open the application

I'm developing an app and use push notification. My app contains a list of IDs. Clicking on particular id, I am able to see the details related to the id.
The push notification contains an id and so I want that if I click on the push notification then it will open the details page of the id for display details related to the id from the notification.
For e.g.
In my app, I have number of Ids (for example 123,456,657...) and if I clicking on 123, it will show the details related to the id like name, phone no, emails etc.. and my push notification contain 123, I want that if I clicked on push notification, it will open the details page of 123 id.

Using PushNotification you are passing some id for your items in application's local database or WebService calling id or whatever..
Create a pending intent for that DetailActivity and pass this id in bundle for this.. and write code to getId from bundle here and based on that get data from database or WebService..
if any query feel free to ask..

You must put the id as an extra for intent associated to notification:
NotificationCompat.Builder builder = new NotificationCompat.Builder(this).setSmallIcon(R.drawable.ic_launcher)
.setAutoCancel(true);
// Create intent and set extra
Intent targetIntent = new Intent(this, <YourDetailsActivity>.class);
targetIntent.putExtra("id", id);
// Associate intent to notification
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, targetIntent, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(contentIntent);
// Create notification...
Notification notification = builder.build();
// ...and show it
NotificationManager nManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
nManager.notify(<YOUR_NOTIFICATION_ID>, notification);

How to display Android notifications as a dialog alerts when App is running and visible

My question is a bit complicated so I am going to describe it briefly what I want to achieve. My application receives messages from GCM without any issue. When application is running and is visible to the user I am not displaying notification in Action Bar, I am displaying this message in dialog alert. I use BroadcastReceiver to achieve this.
The main issue is that, when app gets a few notifications in no time. When main activity is visible to the user, the first notification will be shown in dialog alert. And next will be placed in Action Bar as usual Android notifications. And at this moment user disposes the dialog alert and is going to choose a next notification from Action Bar. At this moment I am using in my CloudService (extends IntentService) intent with flag Intent.FLAG_ACTIVITY_CLEAR_TOP and also PendingIntent.FLAG_UPDATE_CURRENT flag for pendingIntent. PendingIntent is just the contentIntent for my NotificationCompat.Builder.
It works in this way that for each user click on the notification from Action Bar, my activity is refreshing (floats to the lower device edge and then floats from the upper edge with dialog alert with message - I am getting the extras from the intent in onResume method). This action is quite OK. Activity has only one instance in that case - I don't have to break through the few instances of the same activity while I have opened few notifications. But the big problem is that when user chooses any of the notifications in each case the last one will open in dialog alert. Activity seems to has the same intent despite of PendingIntent.FLAG_UPDATE_CURRENT.
There are two methods in CloudService which handle cloud messages:
private void showNotification(Bundle extras) {
notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
String message = extras.getString(CloudMetaData.MESSAGE);
if (App.isMyActivityVisible() && !CloudMessageDialogFragment.isAttached()) {
sendBroadcast(message, NOTIFICATION_ID);
} else {
Intent intent = new Intent(this, MyParentActivity.class);
intent.putExtra(CloudMetaData.MESSAGE, message);
intent.putExtra(CloudMetaData.NOTIFICATION_ID, NOTIFICATION_ID);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setContentTitle(getString(R.string.app_name));
builder.setStyle(new NotificationCompat.BigTextStyle().bigText(alert));
builder.setContentText(alert);
builder.setAutoCancel(true);
builder.setDefaults(Notification.DEFAULT_SOUND);
builder.setContentIntent(contentIntent);
notificationManager.notify(NOTIFICATION_ID, builder.build());
}
NOTIFICATION_ID++;
}
And method which send broadcast is just like that:
private void sendBroadcast(String message, int notificationId) {
Intent intent = new Intent();
intent.setAction(ACTION_FROM_CLOUD_SERVICE);
intent.putExtra(CloudMetaData.MESSAGE, message);
intent.putExtra(CloudMetaData.NOTIFICATION_ID, notificationId);
sendBroadcast(intent);
}
In which way can I achieve similar solution? But it is important for user of course to open notification from Action Bar and shown him its correct message.
EDIT
I have switched my dialog alert into the dialog activity. This is its definition in AndroidManifest:
<activity
android:name="com.myapp.activity.CloudMessageDialogActivity"
android:theme="#android:style/Theme.Dialog"
android:parentActivityName="com.myapp.activity.MyParentActivity"/>
But the result is still the same - when app receives a few notifications, clicking on one of them will open the dialog with the intent for the last received notification.

But the big problem is that when user chooses any of the notifications in each case the last one will open in dialog alert. Activity seems to has the same intent despite of PendingIntent.FLAG_UPDATE_CURRENT.
That's because you are using the same request code (i.e., 0) for all PendingIntents here:
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
By doing so, you are ultimately receiving the same intent, because the platform is failing to see the difference between the intents and delivering the same object everytime:
... it is important to know when two Intents are considered to be the same for purposes of retrieving a PendingIntent. A common mistake people make is to create multiple PendingIntent objects with Intents that only vary in their "extra" contents, expecting to get a different PendingIntent each time. This does not happen. The parts of the Intent that are used for matching are the same ones defined by Intent.filterEquals. If you use two Intent objects that are equivalent as per Intent.filterEquals, then you will get the same PendingIntent for both of them.
So, instead of a constant value, please use a unique request code. For e.g. change the above line with:
PendingIntent contentIntent = PendingIntent.getActivity(this, NOTIFICATION_ID,
intent, PendingIntent.FLAG_UPDATE_CURRENT);
Hope this helps.