[SOLVED] Heads up notification do not work sometimes

Heads up notification do not work sometimes

I make a head up notification this way:

Notification.Builder nb = new Notification.Builder(context)
        .setSmallIcon(icon)
        .setContentTitle("Title")
        .setContentText("Content")
        .setDeleteIntent(delete)
        .setPriority(Notification.PRIORITY_HIGH)
        .setVibrate(new long[0]);

notificationManager.notify(1, nb.build()); // TODO hardcode

First time I install application on a testing device, notifications are heads up, but if I expand notification area (while heads up is still running) and dismiss the notification from there, next time notifications are not heads up. After reinstalling the app notifications are heads up again. Are there any reasons why heads up behaviour can not be constant?

Solution

Heads up notifications have a built in rate limiting - if the user swipes your heads up notification up (putting it back into the notification tray) or to the side (dismissing it), then that signals the system to prevent further heads up notifications for some period of time (~a minute by default).