Xamarin.forms: Fast Renders accessing Disposed object - Crash

[ianvink]

Description

Xamarin Forms 2.5 re consistenly recieve this error in Android when we force the Orientation of the page to Landscape then to Portrait in code.

Xamarin caused by: android.runtime.JavaProxyThrowable: System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer'.
Java.Interop.JniPeerMembers.AssertSelf(IJavaPeerable self)<e8c0e16a54534fa885244f0ad837c79e>:0
Java.Interop.JniPeerMembers.JniInstanceMethods.InvokeNonvirtualVoidMethod(string encodedMember, IJavaPeerable self, JniArgumentValue* parameters)<e8c0e16a54534fa885244f0ad837c79e>:0
Android.Widget.TextView.set_TextFormatted(ICharSequence value)<848bbd7c681a4975918c72f17d2f5144>:0
Android.Widget.TextView.set_Text(string value)<848bbd7c681a4975918c72f17d2f5144>:0
Xamarin.Forms.Platform.Android.FastRenderers.LabelRenderer.UpdateText()<aae4e9ce5a5b4d3eaec4edf21079f3fa>:0

Steps to Reproduce

Set the MainActivity to ScreenOrientation = ScreenOrientation.Portrait
Add a Navigation Page
Add Two Pages
PageOne force it to Portrait in code with this:
```
var activity = (Activity)CrossCurrentActivity.Current.Activity;
if(activity.RequestedOrientation!= ScreenOrientation.Portrait )
activity.RequestedOrientation = ScreenOrientation.Portrait ;

Navigate to Page Two and Allow it to do Orientation Changes:

var activity = (Activity)CrossCurrentActivity.Current.Activity;
if(activity.RequestedOrientation!= ScreenOrientation.Unspecified)
activity.RequestedOrientation = ScreenOrientation.Unspecified;
```

Rotate the device while on PageTwo
Press Back to get back to PageOne
Error. Bang.

Expected Behavior

No error

Actual Behavior

Basic Information

• IDE: VS2017
• Platform Target Frameworks:
  
  
  
  • Android: 8.0
  
  
• Android Support Library Version: 26

[ianvink]

I discovered it happens much "less" when I set the List Views on PageOne to CachingStrategy="RecycleElement"

[jassmith]

Looks like this is caused by a cell be recycled incorrectly. This is why RecycleElements reduces the occurrence of the issue. A reproduction case would be incredibly useful. This is not the first report of the issue however the others also do not have a boiled down repro case :/

[jassmith]

Sans repro we cant move forward. I suspect this is fixed by the recent android listview dummy cell fix anyway.

[cavaIV]

This bug still occurs for me (Xamarin Forms 2.5.0.280555)
Is there any solution for this or has this fixed with a later version?

[transis2]

This bug still occurs for me (Xamarin Forms 3.6.0.344457)

[ianvink]

I have a repo in XF 4.x. I need an email address to send it to, it has licences.

[transis2]

I have a repo in XF 4.x. I need an email address to send it to, it has licences.

Please call @samhouts

[PureWeen]

@ianvink shneuvil at microsoft.com

[mrrenaud]

@ianvink did you found a solution to your problem? We're still experiencing a similar issue on latest XF version.