Missing dependencies cause crash when registering AppStateChanged callback

[aaronflippo]

Step 0: Are you in the right place?

[REQUIRED] Step 1: Describe your environment

• Unity version: 2020.29.f1
• Google Mobile Ads Unity plugin version: 8.8.0
• Platform: Android
• Platform OS version: Android 11 (eg iOS 10, Android 9)
• Any specific devices issue occurs on: _____
• Mediation ad networks used, and their versions: _____

[REQUIRED] Step 2: Describe the problem

Calling this during startup (to register app stage change events for OnOpen ads):

AppStateEventNotifier.AppStateChanged += OnAppStateChanged;

Results in the following exception:
2023-04-12 11:44:43.679 13474-13538/? E/Unity: AndroidJavaException: java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/lifecycle/DefaultLifecycleObserver;
java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/lifecycle/DefaultLifecycleObserver;
at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0)
at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:223)
at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20)
Caused by: java.lang.ClassNotFoundException: androidx.lifecycle.DefaultLifecycleObserver
at com.unity3d.player.UnityPlayer.nativeRender(Native Method) 
at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0) 
at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:223) 
at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20) 
at UnityEngine.AndroidJNISafe.CheckException () [0x00000] in <00000000000000000000000000000000>:0
at UnityEngine.AndroidJNISafe.FindClass (System.String name) [0x00000] in <00000000000000000000000000000000>:0
at UnityEngine.AndroidJavaObject._AndroidJavaObject (System.String className, System.Object[] args) [0x00000] in <00000

Steps to reproduce:

1. Try to execute the following code: AppStateEventNotifier.AppStateChanged += OnAppStateChanged;

It looks like an important dependency may have been removed in commit 598e82e:
598e82e

Adding these lines back into the GoogleMobileAdDependencies.xml file fixes this for me:

https://maven.google.com/ https://maven.google.com/

Relevant Code:

See above

[NVentimiglia]

@aaronflippo

I am glad you found a work around, that said the dependencies should have resolved on their own as they are included by the google mobile ads aar file.

Can you help us out by including a log of your external dependency manager resolution process?

Assets > External Dependency Manager > Android Resolver > Force Resolve

[DavianMachete]

Step 0: Are you in the right place?

[REQUIRED] Step 1: Describe your environment

• Unity version: 2020.29.f1
• Google Mobile Ads Unity plugin version: 8.8.0
• Platform: Android
• Platform OS version: Android 11 (eg iOS 10, Android 9)
• Any specific devices issue occurs on: _____
• Mediation ad networks used, and their versions: _____

[REQUIRED] Step 2: Describe the problem

Calling this during startup (to register app stage change events for OnOpen ads):

AppStateEventNotifier.AppStateChanged += OnAppStateChanged;

Results in the following exception: 2023-04-12 11:44:43.679 13474-13538/? E/Unity: AndroidJavaException: java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/lifecycle/DefaultLifecycleObserver; java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/lifecycle/DefaultLifecycleObserver; at com.unity3d.player.UnityPlayer.nativeRender(Native Method) at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0) at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:223) at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20) Caused by: java.lang.ClassNotFoundException: androidx.lifecycle.DefaultLifecycleObserver at com.unity3d.player.UnityPlayer.nativeRender(Native Method)  at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0)  at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:223)  at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20)  at UnityEngine.AndroidJNISafe.CheckException () [0x00000] in <00000000000000000000000000000000>:0 at UnityEngine.AndroidJNISafe.FindClass (System.String name) [0x00000] in <00000000000000000000000000000000>:0 at UnityEngine.AndroidJavaObject._AndroidJavaObject (System.String className, System.Object[] args) [0x00000] in <00000

Steps to reproduce:

1. Try to execute the following code: AppStateEventNotifier.AppStateChanged += OnAppStateChanged;

It looks like an important dependency may have been removed in commit 598e82e: 598e82e

Adding these lines back into the GoogleMobileAdDependencies.xml file fixes this for me:

https://maven.google.com/ https://maven.google.com/

Relevant Code:

See above

This worked for me too, just added the removed lines. Thank you...

[tienassassin]

I meet this issue again. I tried @aaronflippo 's solution (added the removed lines in GoogleMobileAdDependencies.xml). it not only didn't work, but also made my app crash on startup
Please check @NVentimiglia

[ThinhHB]

Thanks @aaronflippo , that worked for me!

[faisalameerCS]

Adding the following dependencies in the GoogleMobileAdsDependencies.xml worked for me.

<androidPackage spec="androidx.lifecycle:lifecycle-process:2.7.0">
	<repositories>
		<repository>https://maven.google.com/</repository>
	</repositories>
</androidPackage>