How can I resolve runtime crashes in a MAUI project when integrating Android libraries as AARs, despite resolving dependencies and fixing NoClassDefFoundError exceptions?

Question

We already have working libraries for iOS and Android, and now I’m trying to integrate them into a MAUI project. The iOS binding works fine, but I’m running into issues with the Android binding.

At first, I was getting NoClassDefFoundError exceptions. To fix it, I added all the necessary Maven dependencies as AAR or JAR files, and the dependencies seem to be resolved. But the app is still crashing at runtime in MAUI.

Is there anything else I should check or do when adding Android libraries as AARs in MAUI? Any tips to fix this would be super helpful!

Potential Crashed I found in logs, might help to identify issue

02:14.586 E/OplusTrack-ApkInfoUtil( 1966): java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference

01-24 00:02:14.586 W/System.err( 1966): java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference

01-24 00:02:14.587 W/System.err( 1966): 	at y6.a.a(ApkInfoUtil.java:6)

01-24 00:02:14.587 W/System.err( 1966): 	at r6.b.(TrackEvent.java:10)

01-24 00:02:14.587 W/System.err( 1966): 	at r6.a.(CommonBean.java:1)

01-24 00:02:14.587 W/System.err( 1966): 	at p6.f.b(OplusTrack.java:1)

01-24 00:02:14.587 W/System.err( 1966): 	at v6.b$c.d(AppLaunchEventRecorder.java:9)

01-24 00:02:14.587 E/Athena  ( 1966): MemoryGuardAction: handleAppChange

01-24 00:02:14.589 W/Battery ( 9155): ThermalControlUtils: mForegroundPkg=com.android.launcher

-----------------------------------------------------------------------------------------------

01-23 23:31:48.778 F/DEBUG   (31493):     x0  0000007dd2f4bd08  x1  0000007dd2f4bdd0  x2  0000007dd2f4bfa8  x3  0000007dd2f4bfac

01-23 23:31:48.778 F/DEBUG   (31493):     x4  0000007dd2f4ab70  x5  0000000014c47ec0  x6  b400007e592b4f00  x7  b400007e3d1cf800

01-23 23:31:48.778 F/DEBUG   (31493):     x8  0000007dd2f4bdd0  x9  0000000000000788  x10 0000000000000000  x11 0000000000000001

01-23 23:31:48.778 F/DEBUG   (31493):     x12 0000000000000004  x13 0c36e8713fd72ff9  x14 0000000000000006  x15 ffffffffffffffff

01-23 23:31:48.778 F/DEBUG   (31493):     x16 0000007dd01a7a98  x17 0000007ee29cd69c  x18 0000007dc25d4000  x19 0000007dd2f4bd08

01-23 23:31:48.778 F/DEBUG   (31493):     x20 0000007dd2f4bdd0  x21 0000000000000000  x22 00000000000000c8  x23 0000007dd2f4bff0

01-23 23:31:48.778 F/DEBUG   (31493):     x24 0000007eeb8e4980  x25 0000000000000002  x26 0000007eeb8e53c8  x27 0000000000000002

01-23 23:31:48.778 F/DEBUG   (31493):     x28 0000007dd2f4bec0  x29 0000007dd2f4bd50

01-23 23:31:48.778 F/DEBUG   (31493):     lr  0000007dd009e480  sp  0000007dd2f4bd00  pc  0000007dd009e4a4  pst 0000000020001000

01-23 23:31:48.778 F/DEBUG   (31493): backtrace:

01-23 23:31:48.778 F/DEBUG   (31493):       #00 pc 00000000002004a4  /data/app/~~FvLZ8FlErojfMYH9K17vFg==/com.companyname.mauisample-aX5f5eq4D0bVLnVPFrARow==/lib/arm64/libmonosgen-2.0.so (BuildId: 5c0f30dec901885b27282d3532d8efe2d5d00206)

01-23 23:31:48.778 F/DEBUG   (31493):       #01 pc 0000000000200338  /data/app/~~FvLZ8FlErojfMYH9K17vFg==/com.companyname.mauisample-aX5f5eq4D0bVLnVPFrARow==/lib/arm64/libmonosgen-2.0.so (BuildId: 5c0f30dec901885b27282d3532d8efe2d5d00206)

01-23 23:31:48.778 F/DEBUG   (31493):       #02 pc 000000000020a1d8  /data/app/~~FvLZ8FlErojfMYH9K17vFg==/com.companyname.mauisample-aX5f5eq4D0bVLnVPFrARow==/lib/arm64/libmonosgen-2.0.so (mono_assembly_name_new+36) (BuildId: 5c0f30dec901885b27282d3532d8efe2d5d00206)

01-23 23:31:48.778 F/DEBUG   (31493):       #03 pc 00000000000595c4  /data/app/~~FvLZ8FlErojfMYH9K17vFg==/com.companyname.mauisample-aX5f5eq4D0bVLnVPFrARow==/lib/arm64/libmonodroid.so (xamarin::android::Util::monodroid_load_assembly(void*, char const*)+48) (BuildId: 9b2ac0a5675842484749a6f6c33cdd76cea72d2c)

Document Reference :

https://learn.microsoft.com/en-us/dotnet/communitytoolkit/maui/native-library-interop/get-started

https://devblogs.microsoft.com/dotnet/native-library-interop-dotnet-maui/

https://github.com/CommunityToolkit/maui.nativelibraryinterop

Note : Some of the libraries used to build our android library are focused to support Kotlin Multi Platform(KMP).
Thanks, Megha