Bug 43224 (A-B-C-A, navigation) - On Android when navigate from A to B then to C then back to A, the view A is not rendered correctly
Summary: On Android when navigate from A to B then to C then back to A, the view A is ...
Alias: A-B-C-A, navigation
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: unspecified
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-08-10 11:22 UTC by Adam Wu
Modified: 2016-10-02 04:24 UTC (History)
3 users (show)

Tags: navigation ac
Is this bug a regression?: No
Last known good build:

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Description Adam Wu 2016-08-10 11:22:07 UTC
How to replicate:

1. Create a PCL project, add 3 pages: Page1, Page2 and Page3.
2. In each page's constructor set page title to "Page 1", "page 2", and "Page 3"
3. In App.xaml.cs constructor add code
    MainPage = new NavigationPage(new Page1());

4. On each page, put one button on it
5. On page 1 button click event handler:
    await Navigation.PushAsync(new Page2());

6. On page 2 button click event handler:
    await Navigation.PushAsync(new Page3());

7. Then in page 3 the button click event handler I use below the code nav back to page 1 directly by escaping page 2.
    await Navigation.PopAsync();

The code works perfectly on iOS but not on Android. On Android it seems nav back to page 1 but page 1 view is not rendered, the title "Page 1" is showing but the button is gone so the view is basically blank. I tested on Nexus 4 API19 and API 22 and the outcome is same.
Comment 1 Paul DiPietro [MSFT] 2016-08-10 16:15:11 UTC
I'm not able to reproduce this on an API 19 emulator. A reproduction project here would be helpful even if the replication steps are somewhat clear.
Comment 2 Adam Wu 2016-08-11 09:52:00 UTC
Hi Paul,

I can replicate the issue on API 19, 22 and 23 by using the Nexus 4 emulator. Please clone the demo project here: https://bitbucket.org/wjgroup/bugzilla
Comment 3 Adam Wu 2016-08-11 10:53:36 UTC
The project has 4 pages, at the last page there are 2 buttons, one button jump back to page 3 bypassing page 3, which won't work because page 2 will not render properly.
Comment 4 Paul DiPietro [MSFT] 2016-08-11 16:32:31 UTC
This appears to be an AppCompat issue and works when using FormsApplicationActivity.
Comment 5 Adam Wu 2016-08-12 00:59:37 UTC
Any more details or link to show a working example? Do you mean the MainActivity should reference from FormsApplicationActivity instead of the default FormsAppCompatActivity?
Comment 6 Adam Wu 2016-08-12 01:00:44 UTC
Sorry not reference from, I mean inherit
Comment 7 Paul DiPietro [MSFT] 2016-08-12 16:02:26 UTC
Yes, I mean that when the MainActivity inherits from FormsApplicationActivity instead of FormsAppCompatActivity, the issue doesn't occur. They are defined and function differently so this isn't particularly surprising, but it helps to know that one is displaying the issue and not the other.
Comment 8 adrianknight89 2016-10-02 04:24:49 UTC
This issue does not exist for me in XF Please re-test in this version.