Null Pointer exception in ViewGroup.java code

[Varun Anand]

Hi,

My app was running on Nexus 5, OS: Android 5.1.1. 

I saw following crash that appears to be in the ViewGroup.java code. It appears that one of the child view received touch event after it was removed, but some how its reference in the view group was not cleared. Its not an easily reproducible issue. I saw this when I was running adb monkey.

java.lang.NullPointerException: Attempt to read from field 'int android.view.View.mPrivateFlags' on a null object reference at android.view.ViewGroup.resetCancelNextUpFlag(ViewGroup.java:2187) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2104) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369) at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719) at android.app.Activity.dispatchTouchEvent(Activity.java:2742) at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330) at android.view.View.dispatchPointerEvent(View.java:8666) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5807) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5781) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5752) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5897) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) at android.os.MessageQueue.nativePollOnce(Native Method) at android.os.MessageQueue.next(MessageQueue.java:143) at android.os.Looper.loop(Looper.java:122) at android.app.ActivityThread.main(ActivityThread.java:5254) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Thanks,

Varun

[Jiawei Hua]

I met same problem. Is there any progress?