Bug 46339 - OnVisibilityChanged not properly firing on Android 4.4
Summary: OnVisibilityChanged not properly firing on Android 4.4
Alias: None
Product: Forms
Classification: Xamarin
Component: Android ()
Version: 2.3.3
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: Paul DiPietro [MSFT]
Depends on:
Reported: 2016-11-02 19:50 UTC by Jimmy [MSFT]
Modified: 2017-03-01 16:23 UTC (History)
2 users (show)

Tags: visibility onvisibilitychanged api19 ac
Is this bug a regression?: ---
Last known good build:

repro project (53.33 KB, application/zip)
2016-11-02 19:50 UTC, Jimmy [MSFT]

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Description Jimmy [MSFT] 2016-11-02 19:50:28 UTC
Created attachment 18309 [details]
repro project

### Overview
Inside a custom page renderer, OnVisibilityChanged is not being called for a page that is subsequently navigated to. The event is fired properly for the previous view when navigating away from/back to it, it's just the new view that has this issue.

This appears to only be happening on Android 4.4 and below. I could not reproduce it on 5.0/6.0.

### Steps to Reproduce
1. Run the attached Android project on Android 4.4 or lower
2. Press the "Next" button

### Expected Results
The debug output will show:
> ***** TestBasePage Visibility: Gone ******* (for the disappearing page)
> ***** TestBasePage Visibility: Visible ******* (for the appearing page)

### Actual Results
The output only shows:
> ***** TestBasePage Visibility: Gone ******* 

However if you navigate away from the new page then OnVisibilityChanged will be called as expected.

### Testing Info
Tested using Forms 2.3.2 and 2.3.3-pre3