Extend Lollipops "heads-up" notification duration

Question

Been trying to find a way to create a persistent heads up notification, exactly like receiving a phone call or hangouts call. Are these restricted to Google/system apps?

I've tried:

• Updating the notification before the heads up notification is removed.
• Setting the ongoing flag to true.
• Setting auto cancel to false

Can't seem to find this being done anywhere.

Answer 1

It worked for me:

• set ongoing flag to true
  
• set full screen intent
  
• set priority to PRIORITY_HIGH
  
• set category to CATEGORY_CALL
  

Answer 2

Heads-Up Notifications (API level 21) :

Examples of conditions that may trigger heads-up notifications include:

• The user's activity is in fullscreen mode (the app uses fullScreenIntent), or
• The notification has high priority and uses ringtones or vibrations

Second case was enough for me to show heads-up notification. Here is a sample code:

Notification notification = new NotificationCompat.Builder(this)
        .setContentTitle("Title")
        .setContentText("Message")
        .setSmallIcon(R.drawable.ic_notification)
        .setPriority(NotificationCompat.PRIORITY_HIGH)
        .setSound(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.your_sound))
//        .setOngoing(true)
        .build();

NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
nm.notify(42, notification);

Running this sample code every second (depends on your_sound.mp3 duration...) did the trick.

Note, you may want to play silent.mp3 after the first time.

Answer 3

Just, add setOngoing to true. .setOngoing(true);, that`s how you make the notification (heads up), display longer, also no notification is now unswipeable, in the notification panel.