1. Why didn’t you use a Background Agent to scan for GPS location?
I’d have loved to have used a background agent instead. It would have allowed for people to navigate to other apps instead of having to run BusAlarm in the foreground continuously (albeit under a locked screen). Unfortunately, background agents can’t scan for real-time location information. From MSDN:
This API, used for obtaining the geographic coordinates of the device, is supported for use in background agents, but it uses a cached location value instead of real-time data. The cached location value is updated by the device every 15 minutes. |
2. Why didn’t you use Alarms/Reminders?
Ideally, I’d have liked to be able to put the snooze/dismiss prompt up on the locked screen where users could interact with it instead of having to unlock their device first.
However, there are a lot of limitations in the Alarm & Reminder functionality on Mango. For BusAlarm, I needed to be able to:
a. Vibrate the device when you reach your destination
b. Play an audible sound
c. Control what the snooze button does or at least, to hide it if I can’t control it.
Neither Alarms nor Reminders really allowed me to achieve any of the above so I ended up resorting to, essentially, building my own alert mechanism that requires you to unlock your device first. This forum post goes into more details.
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