Android Application Development Cookbook - Second Edition

Making a Flashlight with a Heads-Up Notification

Android 5.0—Lollipop (API 21) introduced a new type of notification called the Heads-Up Notification. Many people do not care for this new notification as it can be extremely intrusive, as it forces its way on top of other apps. (See the following screenshot.) Keep this in mind when using this type of notification. We're going to demonstrate the Heads-Up Notification with a Flashlight as this demonstrates a good use-case scenario.

Here's a screenshot showing the Heads-Up Notification we'll create further on:

If you have a device running Android 6.0, you may have noticed the new Flashlight settings option. ...