问题
Firebase Analytics first_open event sends a parameter previous_first_open_count.
- it starts with value "0" (on lifetime first install / new user).
- and subsequently 1,2,3 .. etc. increments by "1" each time I remove, re-install the app.
Can someone share how the SDK manages to persist the information how often user installed the app (basically triggered first_open) in the past.. AFAIK, once the app is removed, all the app data is deleted.. even the app_instance_id is regenerated each time I remove, re-install the app...
will appreciate to know for both Android and iOS
回答1:
Actually cannot find any documentation about event_param: previous_first_open_count..
When previous_first_open_count = 0, does it means that user installed application only? Or does it mean, that user have installed and opened app for the first time?
As per the definition ’first_open’ (https://support.google.com/firebase/answer/9234069?hl=en&visit_id=637466094047451258-3073953155&rd=1):
the first time a user launches an app after installing or re-installing it
This event is not triggered when a user downloads the app onto a device, but instead when he or she first uses it. To see raw download numbers, look in Google Play Developer Console or in iTunesConnect.
Supports measuring first_open conversions for users who accept Apple's iOS 14 app-tracking prompt.
来源：https://stackoverflow.com/questions/65712259/firebase-first-open-event-previous-first-open-count-param-logic