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NPE In BottomSheetBehavior ViewDragHelper

See original GitHub issue

Description: Crash (see logs below)

Expected behavior: Not to crash

Android API version: 8.1.0

Material Library version: com.google.android.material:material:1.2.0-alpha06

Device: Moto G (5) Plus

More Info: From Android issue tracker:

Looks like this is in https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/bottomsheet/BottomSheetBehavior.java#L512 which should be filed on https://github.com/material-components/material-components-android/issues

There’s already a null check earlier in that method at https://github.com/material-components/material-components-android/blob/master/lib/java/com/google/android/material/bottomsheet/BottomSheetBehavior.java#L498 so probably the same defensive check needs to be done everywhere viewDragHelper is used. Going to close this here - please refile in the Github tracker.

V8 is the obfuscated name of ViewDragHelper, and b is mTouchSlop.

Fatal Exception: java.lang.NullPointerException: Attempt to read from field 'int V8.b' on a null object reference
       at androidx.customview.widget.ViewDragHelper.getTouchSlop(ViewDragHelper.java:503)
       at com.google.android.material.bottomsheet.BottomSheetBehavior.onTouchEvent(BottomSheetBehavior.java:512)
       at androidx.coordinatorlayout.widget.CoordinatorLayout.performIntercept(CoordinatorLayout.java:505)
       at androidx.coordinatorlayout.widget.CoordinatorLayout.onTouchEvent(CoordinatorLayout.java:557)
       at android.view.View.dispatchTouchEvent(View.java:11779)
       at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2965)
       at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2643)
       at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971)
       at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2657)
       at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971)
       at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2657)
       at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971)
       at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2657)
       at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971)
       at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2657)
       at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971)
       at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2657)
       at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2971)
       at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2657)
       at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:477)
       at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1835)
       at android.app.Activity.dispatchTouchEvent(Activity.java:3326)
       at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
       at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:1)
       at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:439)
       at android.view.View.dispatchPointerEvent(View.java:12018)
       at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4829)
       at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4643)
       at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4181)
       at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4234)
       at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4200)
       at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4327)
       at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4208)
       at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4384)
       at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4181)
       at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4234)
       at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4200)
       at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4208)
       at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4181)
       at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6744)
       at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6683)
       at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6644)
       at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6847)
       at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:193)
       at android.os.MessageQueue.nativePollOnce(MessageQueue.java)
       at android.os.MessageQueue.next(MessageQueue.java:325)
       at android.os.Looper.loop(Looper.java:142)
       at android.app.ActivityThread.main(ActivityThread.java:6626)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)

Issue Analytics

State:
Created 3 years ago
Comments:6 (3 by maintainers)

Top GitHub Comments

2reactions

matpagcommented, Aug 5, 2020

Nope, this will be in the next 1.3.0

0reactions

eygrabercommented, Aug 5, 2020

Did this make it into 1.2.0?

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