[android] Emit defaultActivated when tapping the notification

Authored by nicolasfella on Feb 8 2020, 4:44 PM.

Description

[android] Emit defaultActivated when tapping the notification

Summary: When the user taps a notification the corresponding activity is launched. By emitting a signal we allow the app to react to this, e.g. open the right conversation in a chat app.

Test Plan: untested

Reviewers: Frameworks, vkrause

Reviewed By: vkrause

Subscribers: kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D27239