Hello everyone.
Unity version: 2018.2.3f1
Vuforia version: 7.2.24
I am experiencing some trouble when building a release APK for my Android app. The problem occurs when using both "Developer" license key and "Classic" license key.
When building an APK and checking "Development Build" in the Unity build settings, the app installs and functions as expected. However, when creating a release APK, Vuforia initialisation fails and the app launches to a black screen. Play mode in the Unity editor with a webcam also works as expected.
I have the following errors in logcat (when running release APK). The test device is a OnePlus 3 running Android 8.0:
09-10 18:32:19.385 2344 2412 I Unity : Compiled for Android
09-10 18:32:19.385 2344 2412 I Unity :
09-10 18:32:19.385 2344 2412 I Unity : (Filename: ./Runtime/Export/Debug.bindings.h Line: 43)
09-10 18:32:19.385 2344 2412 I Unity :
09-10 18:32:19.509 2344 2412 E Unity : AndroidJavaException: java.lang.ClassNotFoundException: com.vuforia.VuforiaUnityPlayer.VuforiaInitializer
09-10 18:32:19.509 2344 2412 E Unity : java.lang.ClassNotFoundException: com.vuforia.VuforiaUnityPlayer.VuforiaInitializer
09-10 18:32:19.509 2344 2412 E Unity : at java.lang.Class.classForName(Native Method)
09-10 18:32:19.509 2344 2412 E Unity : at java.lang.Class.forName(Class.java:453)
09-10 18:32:19.509 2344 2412 E Unity : at java.lang.Class.forName(Class.java:378)
09-10 18:32:19.509 2344 2412 E Unity : at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
09-10 18:32:19.509 2344 2412 E Unity : at com.unity3d.player.UnityPlayer.c(Unknown Source:0)
09-10 18:32:19.509 2344 2412 E Unity : at com.unity3d.player.UnityPlayer$e$2.queueIdle(Unknown Source:72)
09-10 18:32:19.509 2344 2412 E Unity : at android.os.MessageQueue.next(MessageQueue.java:394)
09-10 18:32:19.509 2344 2412 E Unity : at android.os.Looper.loop(Looper.java:142)
09-10 18:32:19.509 2344 2412 E Unity : at com.unity3d.player.UnityPlayer$e.run(Unknown Source:32)
09-10 18:32:20.162 2344 2412 E Unity : Vuforia cannot be started before it is initialized.
09-10 18:32:20.162 2344 2412 E Unity : Please disable Delayed Initializationin the Vuforia configuration or initialize Vuforia manually with the VuforiaRuntime-class.
I have tried manually initialising Vuforia by setting DelayedInitialization in Vuforia settings and calling VuforiaRuntime.Instance.InitVuforia(); - but this exhibits the same behaviour (works in development build, fails in release build).
Any additional insight would be much appreciated.
Thank you.
Hi Strasza.
This behaviour occurs on both OnePlus 3 and Samsung Galaxy S7 both running Android 8. We have not tested on other Android devices so far, but have tested the same app on various iOS devices with success.
When attempting to initialise Vuforia manually, the "DelayedInitialization" setting was toggled off in the Unity inspector of the Resources/VuforiaConfiguration asset. A call to VuforiaRuntime.Instance.InitVuforia(); was then made in the Start() method of the main GameController script (being sure to include Vuforia namespace). Additionally, the VuforiaBehaviour component was disabled on the ARCamera object using the Unity inspector, and enabled programmatically in the Start() method of the GameController before attempting to initialise Vuforia.
There is no code we have written that is executed conditionally for build/release.
From further investigation, I have managed to narrow down this issue to building using the IL2CPP scripting backend, or building using the mono scripting backend with Proguard minification.
An APK built using the mono scripting backend with minification disabled produces a release APK that operates correctly, however losing ARM64 support is obviously not ideal.
Thank you for taking a look at this.