HelloAR Unity sample app crashing

[brianm-sra]

I followed the instructions on the ARCore Unity "Quickstart for Android" document at https://developers.google.com/ar/develop/unity/quickstart-android

using Unity 2019.4.3f1 Personal on Windows 10

I got it to build and install on my Samsung Galaxy S20+ 5G running Android 10

It crashes at runtime. The logcat shows the following

Error Unity AndroidJavaException: java.lang.ClassNotFoundException: com.unity3d.plugin.UnityAndroidPermissions$IPermissionRequestResult Error Unity java.lang.ClassNotFoundException: com.unity3d.plugin.UnityAndroidPermissions$IPermissionRequestResult Error Unity at java.lang.Class.classForName(Native Method) Error Unity at java.lang.Class.forName(Class.java:454) Error Unity at com.unity3d.player.UnityPlayer.nativeRender(Native Method) Error Unity at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0) Error Unity at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95) Error Unity at android.os.Handler.dispatchMessage(Handler.java:103) Error Unity at android.os.Looper.loop(Looper.java:237) Error Unity at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20) Error Unity Caused by: java.lang.ClassNotFoundException: com.unity3d.plugin.UnityAndroidPermissions$IPermissionRequestResult Error Unity ... 8 more Error Unity at UnityEngine.AndroidJNISafe.CheckException () [0x00096] in <3c22a197ab60454cb70124c69f2248be>:0 Error Unity at UnityEngine.AndroidJNISafe.FindClass (System.String name) [0x0000c] in <3c22a197ab60454cb70124c69f2248be>:0 Error Unity at

followed by a couple of native stack traces that mention UnityEngine.XR.Tango.TangoInputTracking:TryGetPoseAtTime

Any idea what could cause this?

[brianm-sra]

I went back to an older version of Unity, 2018.422f1 Personal, and was able to get the HelloAR scene to work now (see screenshot image below)

So maybe there is some compatibility issue with Unity 2019 seen in my original bug report from a few days ago

[rsfuller]

Thanks for the report!

We are looking into this issue currently.

You've linked the ARCore SDK Quickstart, but you've posted in the ARCore Extensions for AR Foundation repo (see Unity overview for more info on the differences. It would be helpful to understand the Unity setup (and which version of the packages) you are using.

Having said that, some users are experiencing a similar crash with the ARCore Extensions plugin. See the Unity forum for context.

In the meantime (if you are using the ARCore Extensions plugin) I would suggest using one of the workarounds posted in that forum, such as turning off all Minify settings in Project Settings -> Player -> Publisher Settings (and ensure you are meeting the minimum requirements!).

[brianm-sra]

I've actually put my Unity work on the back burner for now and am working with Java and C++ at this time.

I think at the time that I reported this issue on July 10 I was using arcore-unity-sdk-1.18.0.unitypackage GoogleARCore in Assets part of Project

[brianm-sra]

I think I was probably using ARCore SDK and posted the crash report in the wrong place. Sorry for the confusion.

If / when I run into issues with ARCore Extensions for AR Foundation, I will report separately with more details.