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NPE In BottomSheetBehaviour.onInterceptTouchEvent
See original GitHub issueOverview
NullPointerException when attempting to delegate onInterceptTouchEvents to a BottomSheet before onLayoutChild has been called.
The view reference is not checked before being interacted with, which the MotionEvent.ACTION_DOWN case is doing.
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.Reference.get()' on a null object reference
at android.support.design.widget.BottomSheetBehavior.onInterceptTouchEvent(BottomSheetBehavior.java:299)
at android.support.design.widget.CoordinatorLayout.performIntercept(CoordinatorLayout.java:460)
at android.support.design.widget.CoordinatorLayout.onInterceptTouchEvent(CoordinatorLayout.java:499)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2402)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2865)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2492)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:505)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1863)
at android.app.Activity.dispatchTouchEvent(Activity.java:3226)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:467)
at android.view.View.dispatchPointerEvent(View.java:10954)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5051)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4908)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4439)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4492)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4458)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4591)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4466)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4648)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4439)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4492)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4458)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4466)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4439)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6936)
at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6875)
at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6836)
at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7046)
at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:323)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:6692)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
Reproduction steps
This can occur on older/slower devices by spamming touch events to the bottom sheet whilst the layout is being constructed.
Version number
- 26.1.0
Operating system and device
Am able to consistently reproduce on a Samsung S7 7.0. Was originally reported via crashyltics on Samsung Galaxy J1 4.4.4 and Oppo A37fw 5.1.1
Issue Analytics
- State:
- Created 6 years ago
- Reactions:6
- Comments:9 (1 by maintainers)
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There’s another issue related to this, we’re seeing onStopNestedScroll get called before the view is laid out. However there’s a block in this method where
setStateInternalcan get called. That’s what’s happening for us.Then in
setStateInternal, this line causes a crash:View bottomSheet = viewRef.get();Because viewRef hasn’t been assigned
We’re seeing a huge influx of these NPEs. We’re using version 28.0.0 as well and have many bottom sheets in the app so it’s pretty hard to know where it’s coming from:
Is anyone else seeing this?