70.7 Launching an Activity from a Notification

A notification should ideally allow the user to perform some form of action, such as launching the corresponding app, or taking some other form of action in response to the notification. A common requirement is to simply launch an activity belonging to the app when the user taps the notification.

This approach requires an activity to be launched and an Intent configured to launch that activity. Assuming an app that contains an activity named ResultActivity, the intent would be created as follows:

val resultIntent = Intent(this, ResultActivity::class.java)

This intent needs to then be wrapped in a PendingIntent instance. PendingIntent objects are designed to allow an intent to be passed to other applications, essentially granting those applications permission to perform the intent at some point in the future. In this case, the PendingIntent object is being used to provide the Notification system with a way to launch the ResultActivity...