[Bug] Android : Java.Lang.IllegalStateException: Fragment FragmentContainer{7f20e26} (f17e4f2b-a95f-41fd-ade2-368ecc2dd0b4) id=0x2 android:switcher:2:-1519590384} does not have a view

[jonathanantoine]

Description

I have a TabbedPage which is using tabs on the bottom. Each page was a MasterDetails page and since I migrated them to Flyout Page I have this exception making my app crash : Java.Lang.IllegalStateException: Fragment FragmentContainer{7f20e26} (f17e4f2b-a95f-41fd-ade2-368ecc2dd0b4) id=0x2 android:switcher:2:-1519590384} does not have a view

Steps to Reproduce

1. Use a Tabbed Page as the main page (not shell).
2. Create some FlyoutPage having a NavigationPage as the details and a ContentPage as the flyout.
3. Launch the app
4. Use some other apps (especially memory consuming one)
5. Launch again your app from the "main icon"

Expected Behavior

The app is displayed.

Actual Behavior

This exception makes the app crash :

Java.Lang.IllegalStateException: Fragment FragmentContainer{7f20e26} (f17e4f2b-a95f-41fd-ade2-368ecc2dd0b4) id=0x2 android:switcher:2:-1519590384} does not have a view

Basic Information

• Version with issue: at least 5.0.0.1905
• Last known good version: don't know
• Platform Target Frameworks:
  • Android: 10.0 : 29
• Android Support Library / AndroidX Version: (added below in an expendable section)
• NuGet Packages:
• Affected Devices: all android devices

Android Support Library / AndroidX Version:

<PackageReference Include="Xamarin.Android.Support.Animated.Vector.Drawable" Version="28.0.0.3" 
<PackageReference Include="Xamarin.Android.Support.Annotations" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.AsyncLayoutInflater" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Collections" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Compat" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.CoordinaterLayout" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Core.UI" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Core.Utils" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.CursorAdapter" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.CustomTabs" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.CustomView" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Design" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.DocumentFile" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Fragment" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Interpolator" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Loader" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.LocalBroadcastManager" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.SlidingPaneLayout" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.SwipeRefreshLayout" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Transition" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.v4" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.v7.AppCompat" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.v7.CardView" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.v7.MediaRouter" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.v7.Palette" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.v7.RecyclerView" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.Vector.Drawable" Version="28.0.0.3" />
<PackageReference Include="Xamarin.Android.Support.VersionedParcelable" Version="28.0.0.3" />
<PackageReference Include="Xamarin.AndroidX.Activity" Version="1.2.0.1" />
<PackageReference Include="Xamarin.AndroidX.Annotation" Version="1.1.0.9" />
<PackageReference Include="Xamarin.AndroidX.AppCompat" Version="1.2.0.7" />
<PackageReference Include="Xamarin.AndroidX.AppCompat.Resources" Version="1.1.0.1" />
<PackageReference Include="Xamarin.AndroidX.Arch.Core.Common" Version="2.1.0.8" />
<PackageReference Include="Xamarin.AndroidX.Arch.Core.Runtime" Version="2.1.0.8" />
<PackageReference Include="Xamarin.AndroidX.AsyncLayoutInflater" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.Browser" Version="1.3.0.5" />
<PackageReference Include="Xamarin.AndroidX.CardView" Version="1.0.0.8" />
<PackageReference Include="Xamarin.AndroidX.Collection" Version="1.1.0.7" />
<PackageReference Include="Xamarin.AndroidX.CoordinatorLayout" Version="1.1.0.7" />
<PackageReference Include="Xamarin.AndroidX.Core" Version="1.3.2.3" />
<PackageReference Include="Xamarin.AndroidX.CursorAdapter" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.CustomView" Version="1.1.0.6" />
<PackageReference Include="Xamarin.AndroidX.DocumentFile" Version="1.0.1.7" />
<PackageReference Include="Xamarin.AndroidX.DrawerLayout" Version="1.1.1.2" />
<PackageReference Include="Xamarin.AndroidX.Fragment" Version="1.3.0.1" />
<PackageReference Include="Xamarin.AndroidX.Interpolator" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.Core.UI" Version="1.0.0.8" />
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.Core.Utils" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.V4" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.Lifecycle.Common" Version="2.3.0.1" />
<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData" Version="2.3.0.1" />
<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData.Core" Version="2.3.0.1" />
<PackageReference Include="Xamarin.AndroidX.Lifecycle.Runtime" Version="2.3.0.1" />
<PackageReference Include="Xamarin.AndroidX.Lifecycle.ViewModel" Version="2.3.0.1" />
<PackageReference Include="Xamarin.AndroidX.Loader" Version="1.1.0.7" />
<PackageReference Include="Xamarin.AndroidX.LocalBroadcastManager" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.Media" Version="1.2.1.2" />
<PackageReference Include="Xamarin.AndroidX.MediaRouter" Version="1.2.2.1" />
<PackageReference Include="Xamarin.AndroidX.Migration" Version="1.0.8" />
<PackageReference Include="Xamarin.AndroidX.MultiDex" Version="2.0.1.7" />
<PackageReference Include="Xamarin.AndroidX.Palette" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.Print" Version="1.0.0.7" />
<PackageReference Include="Xamarin.AndroidX.RecyclerView" Version="1.1.0.8" />
<PackageReference Include="Xamarin.AndroidX.SavedState" Version="1.1.0.1" />
<PackageReference Include="Xamarin.AndroidX.SlidingPaneLayout" Version="1.1.0.2" />
<PackageReference Include="Xamarin.AndroidX.SwipeRefreshLayout" Version="1.1.0.2" />
<PackageReference Include="Xamarin.AndroidX.Transition" Version="1.4.0.1" />
<PackageReference Include="Xamarin.AndroidX.VectorDrawable" Version="1.1.0.7" />
<PackageReference Include="Xamarin.AndroidX.VectorDrawable.Animated" Version="1.1.0.7" />
<PackageReference Include="Xamarin.AndroidX.VersionedParcelable" Version="1.1.1.7" />
<PackageReference Include="Xamarin.AndroidX.ViewPager" Version="1.0.0.7" />

Environment

Show/Hide Visual Studio info

=== Visual Studio Community 2019 for Mac ===

Version 8.8.10 (build 2)
Installation UUID: 92feefa5-5500-4af3-9272-b35e1821aefa
	GTK+ 2.24.23 (Raleigh theme)
	Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)

	Package version: 612000122

=== Mono Framework MDK ===

Runtime:
	Mono 6.12.0.122 (2020-02/c621c35ffa0) (64-bit)
	Package version: 612000122

=== Roslyn (Language Service) ===

3.8.0-5.20519.18+4c195c3ac1974edcefa76774d7a59a2350ec55fa

=== NuGet ===

Version: 5.8.0.6860

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/5.0.103/Sdks
SDK Versions:
	5.0.103
	5.0.102
	5.0.101
	5.0.100
	3.1.406
	3.1.405
	3.1.404
	3.1.403
	3.1.402
	3.1.401
	3.1.302
	3.1.301
	3.1.300
	3.1.202
	3.1.200
	3.1.102
	3.1.101
	3.1.100
	3.0.101
	3.0.100
	2.2.401
	2.2.300
	2.2.106
	2.2.104
	2.2.101
	2.1.505
	2.1.302
	2.1.301
	2.1.4
MSBuild SDKs: /Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
	5.0.3
	5.0.2
	5.0.1
	5.0.0
	3.1.12
	3.1.11
	3.1.10
	3.1.9
	3.1.8
	3.1.7
	3.1.6
	3.1.5
	3.1.4
	3.1.2
	3.1.1
	3.1.0
	3.0.1
	3.0.0
	2.2.6
	2.2.5
	2.2.4
	2.2.2
	2.2.0
	2.1.23
	2.1.22
	2.1.21
	2.1.20
	2.1.19
	2.1.18
	2.1.17
	2.1.16
	2.1.15
	2.1.14
	2.1.13
	2.1.9
	2.1.2
	2.1.1
	2.0.5

=== .NET Core 3.1 SDK ===

SDK: 3.1.406

=== Xamarin.Profiler ===

Version: 1.6.15.68
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Apple Developer Tools ===

Xcode 12.4 (17801)
Build 12D4e

=== Xamarin.Mac ===

Xamarin.Mac not installed. Can't find /Library/Frameworks/Xamarin.Mac.framework/Versions/Current/Version.

=== Xamarin.iOS ===

Version: 14.10.0.4 (Visual Studio Community)
Hash: 5a05865f6
Branch: xcode12.4
Build date: 2021-01-28 02:30:23-0500

=== Xamarin Designer ===

Version: 16.8.0.510
Hash: 44e3f3ce9
Branch: remotes/origin/d16-8
Build date: 2020-12-10 00:06:14 UTC

=== Xamarin.Android ===

Version: 11.1.0.26 (Visual Studio Community)
Commit: xamarin-android/d16-8/a36ce73
Android SDK: /Users/jonathanantoine/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		4.4 (API level 19)
		8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 31.0.0
SDK Build Tools Version: 30.0.2

Build Information: 
Mono: 5e9cb6d
Java.Interop: xamarin/java.interop/d16-8@79d9533
ProGuard: Guardsquare/proguard/proguard6.2.2@ebe9000
SQLite: xamarin/sqlite/3.32.1@1a3276b
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-8@2fb1cbc

=== Microsoft OpenJDK for Mobile ===

Java SDK: /Users/jonathanantoine/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.8.0.32
Hash: 01a7774
Branch: remotes/origin/d16-8
Build date: 2021-01-14 00:34:58 UTC

=== Android Device Manager ===

Version: 16.8.0.46
Hash: 0a81419
Branch: remotes/origin/d16-8
Build date: 2021-01-14 00:35:22 UTC

=== Build Information ===

Release ID: 808100002
Git revision: f81ffa2444a28c09f173849935ec9ee0195a5b17
Build date: 2021-02-18 12:02:12-05
Build branch: release-8.8
Xamarin extensions: f81ffa2444a28c09f173849935ec9ee0195a5b17

=== Operating System ===

Mac OS X 10.16.0
Darwin 20.3.0 Darwin Kernel Version 20.3.0
    Thu Jan 21 00:07:06 PST 2021
    root:xnu-7195.81.3~1/RELEASE_X86_64 x86_64

Full exception trace Logs

JniEnvironment+InstanceMethods.CallNonvirtualVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args)
Java.Interop
JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters)
Android.App
Activity.OnStart ()
Xamarin.Forms.Platform.Android
FormsAppCompatActivity.OnStart ()
Android.App
Activity.n_OnStart (System.IntPtr jnienv, System.IntPtr native__this)
(wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.14(intptr,intptr)
java.lang.IllegalStateException: Fragment FragmentContainer{97f02ca} (34116daa-5635-4f54-b760-e0190e104a2b) id=0x2 android:switcher:2:-1582031703} does not have a view
androidx.fragment.app.Fragment$4.onFindViewById(Unknown Source:37)
androidx.fragment.app.FragmentStateManager.createView(Unknown Source:73)
androidx.fragment.app.FragmentStateManager.moveToExpectedState(Unknown Source:135)
androidx.fragment.app.FragmentStore.moveToExpectedState(Unknown Source:30)
androidx.fragment.app.FragmentManager.moveToState(Unknown Source:32)
androidx.fragment.app.FragmentManager.dispatchStateChange(Unknown Source:9)
androidx.fragment.app.FragmentManager.dispatchActivityCreated(Unknown Source:11)
androidx.fragment.app.Fragment.performActivityCreated(Unknown Source:23)
androidx.fragment.app.FragmentStateManager.activityCreated(Unknown Source:35)
androidx.fragment.app.FragmentStateManager.moveToExpectedState(Unknown Source:128)
androidx.fragment.app.FragmentStore.moveToExpectedState(Unknown Source:30)
androidx.fragment.app.FragmentManager.moveToState(Unknown Source:32)
androidx.fragment.app.FragmentManager.dispatchStateChange(Unknown Source:9)
androidx.fragment.app.FragmentManager.dispatchActivityCreated(Unknown Source:11)
androidx.fragment.app.FragmentController.dispatchActivityCreated(Unknown Source:4)
androidx.fragment.app.FragmentActivity.onStart(Unknown Source:15)
androidx.appcompat.app.AppCompatActivity.onStart(Unknown Source:0)
crc643f46942d9dd1fff9.FormsAppCompatActivity.n_onStart(Native Method)
crc643f46942d9dd1fff9.FormsAppCompatActivity.onStart(Unknown Source:0)
android.app.Instrumentation.callActivityOnStart Instrumentation.java:1436
android.app.Activity.performStart Activity.java:8124
android.app.ActivityThread.handleStartActivity ActivityThread.java:3527
android.app.servertransaction.TransactionExecutor.performLifecycleSequence TransactionExecutor.java:221
android.app.servertransaction.TransactionExecutor.cycleToPath TransactionExecutor.java:201
android.app.servertransaction.TransactionExecutor.executeLifecycleState TransactionExecutor.java:173
android.app.servertransaction.TransactionExecutor.execute TransactionExecutor.java:97
android.app.ActivityThread$H.handleMessage ActivityThread.java:2108
android.os.Handler.dispatchMessage Handler.java:106
android.os.Looper.loop Looper.java:236
android.app.ActivityThread.main ActivityThread.java:7876
java.lang.reflect.Method.invoke(Native Method)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run RuntimeInit.java:656
com.android.internal.os.ZygoteInit.main ZygoteInit.java:967

Reproduction Link

Workaround

None known

[PureWeen]

@jonathanantoine Can you attach a small repro of this crash? I'm not seeing anything in the stack trace that gives me any indication of what might be wrong here

[stepkillah]

I'm seeing similar crash reports in appcenter, the app doesn't use the flyout page, and it seems like it's crashing on startup, but I was not able to reproduce it, using xamarin forms 5.0.0.2012

JniEnvironment+InstanceMethods.CallNonvirtualVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniObjectReference type, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args)
JniPeerMembers+JniInstanceMethods.InvokeVirtualVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters)
Activity.OnStart ()
FormsAppCompatActivity.OnStart ()
Activity.n_OnStart (System.IntPtr jnienv, System.IntPtr native__this)
(wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.13(intptr,intptr)
java.lang.IllegalStateException: Fragment FragmentContainer{377ee6f} (404d2e67-b3c9-4ab7-9a6b-56fccf4c8521) id=0x4} does not have a view
androidx.fragment.app.Fragment$4.onFindViewById(Unknown Source:37)
androidx.fragment.app.FragmentStateManager.createView(Unknown Source:73)
androidx.fragment.app.FragmentStateManager.moveToExpectedState(Unknown Source:135)
androidx.fragment.app.FragmentStore.moveToExpectedState(Unknown Source:30)
androidx.fragment.app.FragmentManager.moveToState(Unknown Source:32)
androidx.fragment.app.FragmentManager.dispatchStateChange(Unknown Source:9)
androidx.fragment.app.FragmentManager.dispatchActivityCreated(Unknown Source:11)
androidx.fragment.app.Fragment.performActivityCreated(Unknown Source:23)
androidx.fragment.app.FragmentStateManager.activityCreated(Unknown Source:35)
androidx.fragment.app.FragmentStateManager.moveToExpectedState(Unknown Source:128)
androidx.fragment.app.FragmentStore.moveToExpectedState(Unknown Source:30)
androidx.fragment.app.FragmentManager.moveToState(Unknown Source:32)
androidx.fragment.app.FragmentManager.dispatchStateChange(Unknown Source:9)
androidx.fragment.app.FragmentManager.dispatchActivityCreated(Unknown Source:11)
androidx.fragment.app.FragmentController.dispatchActivityCreated(Unknown Source:4)
androidx.fragment.app.FragmentActivity.onStart(Unknown Source:15)
androidx.appcompat.app.AppCompatActivity.onStart(Unknown Source:0)
crc643f46942d9dd1fff9.FormsAppCompatActivity.n_onStart(Native Method)
crc643f46942d9dd1fff9.FormsAppCompatActivity.onStart(Unknown Source:0)
android.app.Instrumentation.callActivityOnStart Instrumentation.java:1432
android.app.Activity.performStart Activity.java:7825
android.app.ActivityThread.handleStartActivity ActivityThread.java:3322
android.app.servertransaction.TransactionExecutor.performLifecycleSequence TransactionExecutor.java:221
android.app.servertransaction.TransactionExecutor.cycleToPath TransactionExecutor.java:201
android.app.servertransaction.TransactionExecutor.executeLifecycleState TransactionExecutor.java:173
android.app.servertransaction.TransactionExecutor.execute TransactionExecutor.java:97
android.app.ActivityThread$H.handleMessage ActivityThread.java:2041
android.os.Handler.dispatchMessage Handler.java:107
android.os.Looper.loop Looper.java:214
android.app.ActivityThread.main ActivityThread.java:7389
java.lang.reflect.Method.invoke(Native Method)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run RuntimeInit.java:492
com.android.internal.os.ZygoteInit.main ZygoteInit.java:980

[melimion]

@PureWeen
Crash reproduces after changing font size in OS settings and switching back to the app.

XF 4.8 works OK - no crash, app relaunched.
XF 5.0 crashes

Not sure if this is the reason, but JNI-used constructor is missing from FlyoutPageContainer

[jonathanantoine]

@PureWeen @melimion I did some investigation and it appears it works fine with XF 5.0.0.2012 and FlyoutPage.

Now I am supsecting one of the latest Xamarin.AndroidX nuget package to be the culprit.
I am now upgrading them one by one to detect which one is causing the issue.

Here is my working AndroidX packages versions, updating one of them to the last makes the bug to be here :

<PackageReference Include="Xamarin.AndroidX.Fragment" Version="1.2.5.4"/>

@melimion can you tell me if you have one in a higher version than this ?

Edit - I am trying to update them one by one to find the culprit(s). Here is the list of excluded one :

<PackageReference Include="Xamarin.AndroidX.Interpolator" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.CursorAdapter" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.CustomView" Version="1.1.0.4"/>
<PackageReference Include="Xamarin.AndroidX.AsyncLayoutInflater" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.Browser" Version="1.3.0.4"/>
<PackageReference Include="Xamarin.AndroidX.CardView" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.Collection" Version="1.1.0.6"/>
<PackageReference Include="Xamarin.AndroidX.CoordinatorLayout" Version="1.1.0.6"/>
<PackageReference Include="Xamarin.AndroidX.MultiDex" Version="2.0.1.6"/>
<PackageReference Include="Xamarin.AndroidX.Palette" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.SlidingPaneLayout" Version="1.1.0.1"/>
<PackageReference Include="Xamarin.AndroidX.Print" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.VectorDrawable" Version="1.1.0.6"/>
<PackageReference Include="Xamarin.AndroidX.VectorDrawable.Animated" Version="1.1.0.6"/>
<PackageReference Include="Xamarin.AndroidX.SwipeRefreshLayout" Version="1.1.0.1"/>
<PackageReference Include="Xamarin.AndroidX.Annotation" Version="1.1.0.8"/>
<PackageReference Include="Xamarin.AndroidX.DocumentFile" Version="1.0.1.6"/>
<PackageReference Include="Xamarin.AndroidX.DrawerLayout" Version="1.1.1.1"/>
<PackageReference Include="Xamarin.AndroidX.Loader" Version="1.1.0.6"/>
<PackageReference Include="Xamarin.AndroidX.LocalBroadcastManager" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.Media" Version="1.2.1.1"/>
<PackageReference Include="Xamarin.AndroidX.SavedState" Version="1.0.0.2"/>
<PackageReference Include="Xamarin.AndroidX.ExifInterface"  Version="1.3.2.1"/>
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.Core.UI" Version="1.0.0.7"/>
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.Core.Utils" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.Legacy.Support.V4" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.AppCompat" Version="1.2.0.6"/>
<PackageReference Include="Xamarin.AndroidX.ViewPager" Version="1.0.0.6"/>
<PackageReference Include="Xamarin.AndroidX.Lifecycle.Runtime" Version="2.2.0.4"/>
<PackageReference Include="Xamarin.AndroidX.Lifecycle.ViewModel" Version="2.2.0.4"/>
<PackageReference Include="Xamarin.AndroidX.Migration" Version="1.0.8"/>
<PackageReference Include="Xamarin.AndroidX.VersionedParcelable" Version="1.1.1.6"/>
<PackageReference Include="Xamarin.AndroidX.Core" Version="1.3.2.1"/>
<PackageReference Include="Xamarin.AndroidX.MediaRouter" Version="1.2.0.1"/>
<PackageReference Include="Xamarin.AndroidX.AppCompat.Resources" Version="1.1.0.1"/>
<PackageReference Include="Xamarin.AndroidX.Activity" Version="1.1.0.5"/>

I also plainly removed :

<PackageReference Include="Xamarin.AndroidX.RecyclerView" Version="1.1.0.6"/>
<PackageReference Include="Xamarin.AndroidX.Lifecycle.Common" Version="2.2.0.4"/>
<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData" Version="2.2.0.4"/>
<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData.Core" Version="2.2.0.4"/>
<PackageReference Include="Xamarin.AndroidX.Transition" Version="1.3.1.6"/>
<PackageReference Include="Xamarin.AndroidX.Arch.Core.Common" Version="2.1.0.7"/>
<PackageReference Include="Xamarin.AndroidX.Arch.Core.Runtime" Version="2.1.0.7"/>

[melimion]

@jonathanantoine I have all packages updated to latest version.

Downgrading to versions that you specified fixed the problem.

[PureWeen]

Do you need to reference all those AndroidX packages? Can you just remove them all and just use what transiently comes in with XF?

[jonathanantoine]

@PureWeen yes, it's asked by the Android x migration tools and build failed if not added.

If I run the "Migrate to Android X tool" they are all added back so I can't think it's a good idea to remove them.

[erlenddahl]

I'm seeing this issue after upgrading to the latest packages as well. I upgraded both Xamarin.Forms and all the Xamarin.AndroidX packages, so I'm not sure which of them caused it.

I'm using a FlyoutPage, but no tabs.

[jonathanantoine]

If I don't upgrade Xamarin.AndroidX.Fragment and stay to the Version 1.2.5.4, the crash do not seems to happen.
I think we have our culprit.