FEATURE REQUEST: log state changes in RTFaceLogin

[JackMostow]

Log state transitions to help diagnose future bugs (if any ;-) and understand behavior in RTFaceLogin, e.g.:

1. How long does it take to enroll?
2. How often does enrollment succeed, i.e. add new user?
3. How often does login succeed, i.e. lead to launching RoboTutor?
4. How often do kids record "recreational selfies"?
5. How often do kids look at animals for fun (i.e. not just to confirm identity)?
6. How long does it take to login?
7. Where does the time go, i.e. how much average and total time is spent in each state?

[JackMostow]

If easy, log whether playback or recording is active. E.g. playback shouldn't be ongoing when launch RoboTutor. (see #27)

[JackMostow]

Madelein wisely suggested including current state when log stack trace. Let it be done ;-).

[JackMostow]

@madeleinvillegas - The key state variable is _audioPlaying, which specifies which prompt is playing, and dispatches the central switch (_audioPlaying) case statement in onCompletion at app/src/main/java/com/example/iris/login1/GalleryActivity.java line 498. So logging the value of _audioPlaying at line 498 will describe the current state at that point. _audioPlaying has type STATE, an enumerated type defined in app/src/main/java/com/example/iris/login1/Common.java lines 14ff: public enum STATE { IF_YOU_SEE_YOUR_PICTURE, PLEASE_TAP_ON_YOUR_PICTURE, TO_SEE_MORE_PICTURES, ... I think toString(_audioPlaying) should return this state name so you can log it intelligibly. Thanks! - Jack

[JackMostow]

Use same timestamp format YYYYMMDD_HHMMSS.mmm for filename as for event.
@Jiayan -- Will . in a filename cause your log analysis code any problems?

[JackMostow]

@madeleinvillegas - Event-type-generic:

"hiatus": 2310,
  "timestamp": "20230126_214921.193",
  "eventType": "_audioPlaying",
  "eventValue": "IF_YOU_WANT_TO_SEE_A_DIFFERENT_PICTURE_LOGIN"

Is this all-standard-attribute format better than allowing different attributes?

+: single event logger for all event types

[JackMostow]

LogEvent(eventType, eventValue) → LogEvent computes hiatus, timestamp

[JackMostow]

@madeleinvillegas Log Gallery_activity hide and show to track UI changes +: quick and easy (?)