Android 9 Development Cookbook - Third Edition

How it works...

We combined all three actions into a single notification, simply because we could. You don't have to use all three extra notification options or even any. Only the following are required:

.setSmallIcon() 
.setContentText() 

If you don't set both the icon and text, the notification will not show.

We used NotificationCompat to build our notification. This comes from the support library and makes it easier to be backward-compatible with older OS versions. If we request a notification feature that is not available on the user's version of OS, it will simply be ignored.

These three lines of code produce our extra notification options:

.setSound(notificationSoundUri) .setLights(Color.BLUE, 500, 500) .setVibrate(new long[]{250,500,250,500,250,500}); ...