As described in this question on android.se regarding Face Unlock on HTC phones, it was discovered that HTC in all their wisdom have removed the ability to 'train' faces from their settings menu.
I was hoping to be able to write a one button app that would link to the missing feature (assuming it hasn't been removed entirely).
I assume that is an activity of some app, so presumably I could use an intent to open it. However I have no idea how I would go about finding which activity of which application to trigger? I've looked through the developer reference and can't find anything, should I peer through the Android Source code? This answer perhaps suggests that that wont help me though.
I could try this solution - would I use settings as the app to target?
