Bug 58867 - OnAppearing and OnDisappearing out of sequence with PushModalAsync during backgrounding/foregrounding app
Summary: OnAppearing and OnDisappearing out of sequence with PushModalAsync during bac...
Alias: None
Product: Forms
Classification: Xamarin
Component: Android ()
Version: 2.4.0
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2017-08-17 22:52 UTC by TijoT
Modified: 2017-11-18 17:09 UTC (History)
5 users (show)

Tags: appearing, backgrounding, ac
Is this bug a regression?: ---
Last known good build:

Xamarin Forms Solution Android Platform (58.88 KB, application/x-zip-compressed)
2017-08-17 22:52 UTC, TijoT

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Description TijoT 2017-08-17 22:52:51 UTC
Created attachment 24285 [details]
Xamarin Forms Solution Android Platform

I have two pages, Main page and Page1. Main page is the root page with navigation. Button tap in Main Page triggers PushModalAsync of Page1.

Launch Application 
Click Button in Main Page
Page1 Appears
Tap home button to background the app
Launch App again to make it foreground
Page1 Appears

Actual Sequence of OnAppearing/OnDisappearing

OnAppearing MainPage
OnDisappearing MainPage
OnAppearing Page1
OnAppearing MainPage

Instead of

OnAppearing MainPage
OnDisappearing MainPage
OnAppearing Page1
OnDisappearing Page1
OnAppearing Page1

Xamarin Forms :
Android OS: 6.0.1
Comment 1 Paul DiPietro [MSFT] 2017-08-17 23:38:49 UTC
Also tested against the 2.4.0pre1 build.
Comment 2 TijoT 2017-08-29 20:22:14 UTC
Hi Paul,

Can you please let me know which release this issue will be fixed?
Comment 3 adrianknight89 2017-11-18 17:09:40 UTC
This issue (or a similar one) was discussed a long time ago. See if you can use these platform specifics to disable these events on pause/resume.


Maybe this wasn't fixed to avoid introducing breaking changes. You'd have to send messages to your individual pages on App Pause/Resume events instead. Dirty hack, but it does the work.