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Fix screen deltas to keep only consecutive UNLOCK/OFF pairs

pull/95/head
JulioV 2020-03-03 12:09:18 -05:00
parent e058820309
commit f4367806f3
1 changed files with 8 additions and 3 deletions
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11
src/features/screen_deltas.R
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@ -44,9 +44,12 @@ get_ios_screen_episodes <- function(screen){
local_end_day_segment = last(local_day_segment))
}
get_android_screen_episodes <- function(screen){
get_android_screen_episodes <- function(screen){
# Aware logs LOCK events after turning the screen ON or OFF but we filter them out to simplify this analysis.
# The code below only process UNLOCK to OFF episodes, but it's possible to modify it for ON to OFF (see line 61) or ON to UNLOCK episodes.
episodes <- screen %>%
# filter out UNLOCK events (2) that come within 50 milliseconds of an ON or OFF event
# filter out LOCK events (2) that come within 50 milliseconds of an ON (1) or OFF (0) event
filter(!(screen_status == 2 & lag(screen_status) == 1 & timestamp - lag(timestamp) < 50)) %>%
filter(!(screen_status == 2 & lag(screen_status) == 0 & timestamp - lag(timestamp) < 50)) %>%
# in Android and after our filtering, screen episodes should end with a OFF event (0)
@ -55,8 +58,10 @@ get_android_screen_episodes <- function(screen){
group_by(episode_id) %>%
# Rarely, UNLOCK events (3) get logged just before ON events (1). If this happens within 800ms, swap them
swap_screen_status(3L, 1L, 800) %>%
# to be consistent with iOS we get rid off events (and thus sequences) starting with an ON (1) event
# to be consistent with iOS we filter out events (and thus sequences) starting with an ON (1) event
filter(screen_status != 1) %>%
# only keep consecutive 3,0 pairs (UNLOCK, OFF)
filter( (screen_status == 3 & lead(screen_status) == 0) | (screen_status == 0 & lag(screen_status) == 3) ) %>%
summarise(episode = "unlock",
screen_sequence = toString(screen_status),
time_diff = (last(timestamp) - first(timestamp)) / 1000,