This might not disable all notifications, but for every app on my Android phone that I've wanted to block notifications, I can open the app settings (deep in so

This might not disable all notifications, but for every app on my Android phone that I've wanted to block notifications, I can open the app settings (deep in some menu, or process manager, found via googling as I do it rarely) and disable notifications for just that app. It's on the same screen as doing a Force Stop, I believe.