推送通知会覆盖以前的通知

Question

I'm using codeigniter-gcm library on top of codeigniter to send messages to Google Cloud Messaging service. It sends the message and the message is received at the mobile device, but if I send multiple messages, only the latest message appears on the device (as if it is overriding the previous messages).

I'm seeing that I might need to create a unique notification ID, but I'm not seeing how it's done anywhere on the codeigniter-gcm documentation or Google's documentation for downstream messages.

Any idea how this should be done?

Here's my code in the codeigniter controller. It is worth mentioning that Google's response contains a different message_id for each time I send a push...

public function index() {
    $this->load->library("gcm");
    $this->gcm->setMessage("Test message sent on " . date("d.m.Y H:i:s"));
    $this->gcm->addRecepient("*****************");
    $this->gcm->setData(array(
        'title' => 'my title',
        'some_key' => 'some_val'
    ));
    $this->gcm->setTtl(false);
    $this->gcm->setGroup(false);
    if ($this->gcm->send())
        echo 'Success for all messages';
    else
        echo 'Some messages have errors';

    print_r($this->gcm->status);
    print_r($this->gcm->messagesStatuses);
}

Answer 1

After three exhausting days I found the solution. I'm posting it here in hope of saving someone else's time...

I had to add a parameter to the data object inside the greater JSON object, named "notId" with a unique integer value (which I chose to use a random integer from a wide range). Now why Google didn't include this in their docs? Beats me...

Here's how my JSON looks now, when it creates separate notifications instead of overriding:

{
    "data": {
                "some_key":"some_val",
                "title":"test title",
                "message":"Test message from 30.09.2015 12:57:44",
                "notId":14243
            },
    "registration_ids":["*******"]
}

• Edit: I'm now thinking that the notId parameter is not really determined by Google, but by a plugin I use on the mobile app side. To extend further on my environment, my mobile app is developed using Phonegap, so to get push notification I use phonegap-plugin-push which I now see in its docs that parameter name. I'm kinda' lost now as far as explaining the situation - but happy it is no longer a problem for me :-)

Answer 2

You need to pass a unique ID to each notification. Once you have clicked on the notification you use that ID to remove it.

    ...
mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotificationManager.cancel(SIMPLE_NOTFICATION_ID_A);
...

But I'm sure you shouldn't have so much of notifications for user at once. You should show a single notification that consolidates info about group of events like for example Gmail client does. Use Notification.Builder for that purpose.

NotificationCompat.Builder b = new NotificationCompat.Builder(c);
   b.setNumber(g_push.Counter)
    .setLargeIcon(BitmapFactory.decodeResource(c.getResources(), R.drawable.list_avatar))
    .setSmallIcon(R.drawable.ic_stat_example)
    .setAutoCancel(true)
    .setContentTitle(pushCount > 1 ? c.getString(R.string.stat_messages_title) + pushCount : title)
    .setContentText(pushCount > 1 ? push.ProfileID : mess)
    .setWhen(g_push.Timestamp)
    .setContentIntent(PendingIntent.getActivity(c, 0, it, PendingIntent.FLAG_UPDATE_CURRENT))
    .setDeleteIntent(PendingIntent.getBroadcast(c, 0, new Intent(ACTION_CLEAR_NOTIFICATION), PendingIntent.FLAG_CANCEL_CURRENT))
    .setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE)
    .setSound(Uri.parse(prefs.getString(
            SharedPreferencesID.PREFERENCE_ID_PUSH_SOUND_URI,
            "android.resource://ru.mail.mailapp/raw/new_message_bells")));