Add widget
https://developer.android.com/guide/topics/appwidgets/overview
Maybe display the last x notifications.
Nice idea! But if it shows the last few messages, I (currently) doesn't need it. It's enough for me to have the notifications in the android system tray and it's almost overkill that the messages are saved at all (on the server). But of course I can imagine of other use cases where such a widget would be interesting. Then it could be useful to have a filter option, so that someone can only display the notifications from app xy in the widget. And maybe a button could be added to the widget which deletes all messages. Alternatively the widget could be used to realize some shortcuts, like sending a predefined message or similar.
Just some thoughts... :)