App crashes invoking method in package

[corradolab]

Android framework version

net9.0-android

Affected platform version

VS 2022 17.13.0

Description

Application uses an external library.
When the library is referenced from the main project eveythong works.
When the library is used as package a runtime error occurs

Steps to Reproduce

BarcodeDemo.zip

The attached demo project contains a BarcodeDemo app, which reference a ZXing.Mobile package. The package is served from the local directory LocalLibs.
The app has a single activity with a single button "Scan", which should bring up a scanning activity. The scanning activity use the device camera to read a barcode and decode it using ZXing.Net. The library is my porting to Net 9 of the no-longer mantained https://github.com/Redth/ZXing.Net.Mobile

If you run the app on an Android 5 or 6, pressing the "Scan" button throws an unhandled exception at row 60 of ZxingActivity.cs. Row 60 was recently added to handle edge-to-edge as required by Android 15.

Did you find any workaround?

The app works correctly if:

1. Executed on Android > 6, or
2. Executed referencing directly the library from the main project instead of using a package

Working configuration

Failing configuration

Relevant log output

[jpobst]

Can you post the logcat containing the crash information?

$ adb logcat -c
# Start the application, wait for it to crash, then wait 5s and:
$ adb logcat -d > log.txt

[corradolab]

Hi Jonathan, below the requested log.

log.txt

Crash reported at line 581.
The app is the test app I submitted, running in debug from Visual Studio on an Android 6 emulator.

[jpobst]

02-17 12:07:07.390 15008 15008 F mono-rt : [ERROR] FATAL UNHANDLED EXCEPTION: Android.Util.AndroidRuntimeException: requestFeature() must be called before adding content
02-17 12:07:07.390 15008 15008 F mono-rt :    at Java.Interop.JniEnvironment.InstanceMethods.CallNonvirtualBooleanMethod(JniObjectReference instance, JniObjectReference type, JniMethodInfo method, JniArgumentValue* args) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/obj/Release/net8.0/JniEnvironment.g.cs:line 20464
02-17 12:07:07.390 15008 15008 F mono-rt :    at Java.Interop.JniPeerMembers.JniInstanceMethods.InvokeNonvirtualBooleanMethod(String encodedMember, IJavaPeerable self, JniArgumentValue* parameters) in /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods_Invoke.cs:line 182
02-17 12:07:07.390 15008 15008 F mono-rt :    at Android.App.Activity.RequestWindowFeature(WindowFeatures featureId) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net9.0/android-35/mcw/Android.App.Activity.cs:line 6440
02-17 12:07:07.390 15008 15008 F mono-rt :    at ZXing.Mobile.ZxingActivity.OnCreate(Bundle bundle)
02-17 12:07:07.390 15008 15008 F mono-rt :    at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_savedInstanceState) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net9.0/android-35/mcw/Android.App.Activity.cs:line 3196
02-17 12:07:07.390 15008 15008 F mono-rt :    at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_V(_JniMarshal_PPL_V callback, IntPtr jnienv, IntPtr klazz, IntPtr p0) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 121

This message:

requestFeature() must be called before adding content

sounds like you are not using the library properly and you need to ensure you are doing what it requires.

I would suggest searching for the error message for guidance, like:
https://stackoverflow.com/questions/4250149/requestfeature-must-be-called-before-adding-content

[corradolab]

I was aware of the "requestFeature() must be called before adding content" error.
To fix it, I moved RequestWindowFeature() before base.OnCreate().

The fix works when the library is referenced as project, but it doesn't when the library is referenced as package.