java.lang.IllegalStateException: FormsAppCompatActivity.n_onStart app exception..

Question

java.lang.IllegalStateException: FormsAppCompatActivity.n_onStart app exception..

Roman Pristinsky 46

Hi!

I can't figure out why my application is crashing.
I use Xamarin.Forms 5.0.0.2012 and AndroidX libraries.
Here is a complete dump of the error from which I can't figure out what's going on:

java.lang.IllegalStateException:
at androidx.fragment.app.Fragment$4.onFindViewById (Fragment.java:2901)
at androidx.fragment.app.FragmentStateManager.createView (FragmentStateManager.java:504)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState (FragmentStateManager.java:282)
at androidx.fragment.app.FragmentStore.moveToExpectedState (FragmentStore.java:112)
at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:1647)
at androidx.fragment.app.FragmentManager.dispatchStateChange (FragmentManager.java:3126)
at androidx.fragment.app.FragmentManager.dispatchActivityCreated (FragmentManager.java:3070)
at androidx.fragment.app.Fragment.performActivityCreated (Fragment.java:3002)
at androidx.fragment.app.FragmentStateManager.activityCreated (FragmentStateManager.java:580)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState (FragmentStateManager.java:285)
at androidx.fragment.app.FragmentStore.moveToExpectedState (FragmentStore.java:112)
at androidx.fragment.app.FragmentManager.moveToState (FragmentManager.java:1647)
at androidx.fragment.app.FragmentManager.dispatchStateChange (FragmentManager.java:3126)
at androidx.fragment.app.FragmentManager.dispatchActivityCreated (FragmentManager.java:3070)
at androidx.fragment.app.FragmentController.dispatchActivityCreated (FragmentController.java:251)
at androidx.fragment.app.FragmentActivity.onStart (FragmentActivity.java:501)
at androidx.appcompat.app.AppCompatActivity.onStart (AppCompatActivity.java:210)
at crc643f46942d9dd1fff9.FormsAppCompatActivity.n_onStart (Native Method)
at crc643f46942d9dd1fff9.FormsAppCompatActivity.onStart (FormsAppCompatActivity.java:128)
at android.app.Instrumentation.callActivityOnStart (Instrumentation.java:1432)
at android.app.Activity.performStart (Activity.java:7923)
at android.app.ActivityThread.handleStartActivity (ActivityThread.java:3359)
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence (TransactionExecutor.java:221)
at android.app.servertransaction.TransactionExecutor.cycleToPath (TransactionExecutor.java:201)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState (TransactionExecutor.java:173)
at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2068)
at android.os.Handler.dispatchMessage (Handler.java:107)
at android.os.Looper.loop (Looper.java:224)
at android.app.ActivityThread.main (ActivityThread.java:7551)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:995)

The crash occurs only on devices with Android 9 and 10 (API level 28 and 29).
The above log was copied from the Google Play console.
During testing, the error does not appear.
Any help?

Roman Pristinsky 46 Reputation points

2021-05-02T15:26:51.6+00:00

A few days after the distribution of a new build of the application with the library Xamarin.Android.Fragment 1.2.5.4, it can be argued that the problem is gone!

Accepted answer

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Roman Pristinsky 46 Reputation points

2021-05-02T15:26:51.6+00:00

A few days after the distribution of a new build of the application with the library Xamarin.Android.Fragment 1.2.5.4, it can be argued that the problem is gone!

Answer 1

JarvanZhang 23,971

Hello,

Welcome to our Microsoft Q&A platform!

Hi, omanPristinsky. Did you install the Xamarin.AndroidX.Fragment package? Try to update the nuget to the lastest stable version for test. If it doesn't work, please try the version 1.2.5.4.

Someone also faced the similar issue and has report the problem to the product team on github. Here are the related links, you could refer to the links and follow the topic for a solution.

https://github.com/xamarin/Essentials/issues/1726
https://github.com/xamarin/Xamarin.Forms/issues/13895#issuecomment-794378682

Best Regards,

Jarvan Zhang

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Roman Pristinsky 46 Reputation points

2021-04-12T08:02:11.55+00:00

Hi, arvanZhang-MSFT.
Thanks for your answer.
I seems like I found the problem in my code.
But so far this is not certain. Need to check.
JarvanZhang 23,971 Reputation points

2021-04-13T05:59:50.7+00:00

Waiting for your update.
Roman Pristinsky 46 Reputation points

2021-04-18T18:41:05.623+00:00

Thanks again for your advices. I have downgraded the Xamarin.AndroidX.Fragment library to 1.2.5.4 version. I fixed all the errors I found in my code, but the problem still remained. When I have the opportunity, I examine the full log (logcat). But even this is not always able to identify the problem. I wonder if there is some approach to understand what the problem is?

P.S. I noticed that this problem also affected other versions of Android.
JarvanZhang 23,971 Reputation points

2021-04-20T15:07:54.447+00:00

The above log was copied from the Google Play console. During testing, the error does not appear.

Does the issue only occur in release mode? What are settings about the release? Could you please share some the details about the configuration?
Roman Pristinsky 46 Reputation points

2021-04-27T11:16:02.89+00:00

Thank you for your participation.
After researching my problem, I was convinced that, indeed, the error is in the library Xamarin.Android.Fragment v1.3.1-1.3.2. So there is no need to provide a config file.
I ran tests on my new build of the program with a downgraded version 1.2.5.4 of the library and so far the errors does not appear. Let's see what will happen next.
JarvanZhang 23,971 Reputation points

2021-04-27T11:55:26.58+00:00

Congrats! And thanks for updating the details.

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java.lang.IllegalStateException: FormsAppCompatActivity.n_onStart app exception..

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