[Android] DisplayHelper #updateDisplayInfo NullPointerException

[Junxiao123]

When using ModelView to load a .glb model following the official demo, everything works fine under normal conditions.
However, during stress testing (running Monkey), an issue occurs where mRender becomes null in DisplayHelper’s updateDisplayInfo method.

Version: 1.64.0

FATAL EXCEPTION: main
Process: com.xx.xxx, PID: 28940
java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.filament.Renderer$DisplayInfo com.google.android.filament.Renderer.getDisplayInfo()' on FloatBallTextAdapter null object reference
at com.google.android.filament.android.DisplayHelper.updateDisplayInfo(Unknown Source:136)
at w2.DisplayHelper.-$$Nest$mupdateDisplayInfo(Unknown Source:0)
at com.google.android.filament.android.DisplayHelper$1.onDisplayChanged(Unknown Source:102)
at android.hardware.display.DisplayManagerGlobal$DisplayListenerDelegate.handleMessage(DisplayManagerGlobal.java:1166)
at android.hardware.display.DisplayManagerGlobal$DisplayListenerDelegate.lambda$sendDisplayEvent$0(DisplayManagerGlobal.java:1133)
at android.hardware.display.DisplayManagerGlobal$DisplayListenerDelegate.$r8$lambda$aO0d1U2yv7-42_0MvY8uEf7AtpE(Unknown Source:0)
at android.hardware.display.DisplayManagerGlobal$DisplayListenerDelegate$$ExternalSyntheticLambda0.run(Unknown Source:6)
at android.os.Handler.handleCallback(Handler.java:958)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:205)
at android.os.Looper.loop(Looper.java:294)
at android.app.ActivityThread.main(ActivityThread.java:8225)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:573)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1058)

[pixelflinger]

we need more info. Please provide detailed repro steps.

[Junxiao123]

we need more info. Please provide detailed repro steps.

This issue doesn’t occur consistently and doesn’t appear during normal usage. It only happens occasionally during Monkey stress testing.

My current fix is to manually compile the Filament Android library and add a null check for mRenderer in DisplayHelper.java within the updateDisplayInfo method. With this change, everything works normally, and the same Monkey stress test no longer triggers the issue.