I don't know if it's possible, but I would love it if a smart dev could add the chrono and count down timer as available fields for a watch face. It's annoying that whenever I'm running one of them, I have to stay on that app to see it.
Watch faces don't accept user input (other than gestures).
I don't need to stop or start the timer or chrono, just see them while they are running in the background. For example, if I have to move my car every two hours to avoid a parking ticket, I'd like to be able to start the countdown timer set for 1:55, then jump back to a watch face that will display the countdown timer as a field on a regularly functioning watch face instead of having to actually stay on the timer app.
There's no way to start something in background and show the data on a watchface.
The only way you could really do this with Connect IQ is to write a watch-app that looks like a watchface, that has a built in countdown timer.
I suppose you could do a watchface where you set the countdown and do start and stop with app settings (you can't interact with a watchface, and it can't do anything like vibrate, and you'd need to have your phone to control it). But in that case, you could probably just use an app on your phone.
How do you expect to set the timer for 1:55 if there is no good way to input data to a watch face?
Given the limitations of the platform, the only way I know of to do this would be to write a complete watch face and use app settings to interact with it. The app settings would prompt for a timer period. When the watch app starts it would see the period property, add the period to the current time to get an alarm time, save the alarm time and then delete the period setting. Then it would just display the time remaining to that alarm time. After the time passes, it could display the watch face in reverse video, and delete the stored alarm time.
Of course there are all sorts of complications with this. How do I restart the timer without my phone? how can the watch face know I've seen the alert? There are many more.
A much simpler solution (at least until the SDK gets the ability to start an app after a specified time) would be to use the built-in alarm feature on your device, or as Jim suggests above, use your phone.
