UPDATE JUNE 2020: This thread is outdated. Instead, follow this guide:
I’m planning to use Lovelace to make a dashboard using an Android tablet using Fully Kiosk Browser. That will replace my current method of a bunch of Tasker-connected Android home screen widgets to perform specific HA tasks like turning switches on/off. Importantly for this question, I also use the Sonos widget on the homescreen. We often use the Sonos widget to launch the Sonos app.
I’d like to include a Lovelace media player card that has a button to launch the Sonos app. I can think of a few ways to achieve opening of the Sonos app by going back through the HA server. But, I’d like to keep everything local to the tablet if possible.
Is there a way to invoke one of those two methods on a button tap without the roundtrip through the HA server.