[AppBarLayout] HeaderScrollingViewBehavior issue

[ytheekshana]

here's the crash log i received on crashlytics

Fatal Exception: java.lang.NullPointerException: Attempt to write to field 'boolean android.animation.AnimatorSet$Node.mEnded' on a null object reference at android.animation.AnimatorSet.onChildAnimatorEnded(AnimatorSet.java:799) at android.animation.AnimatorSet.start(AnimatorSet.java:640) at android.animation.StateListAnimator.start(StateListAnimator.java:188) at android.animation.StateListAnimator.setState(StateListAnimator.java:181) at android.view.View.drawableStateChanged(View.java:18049) at android.view.ViewGroup.drawableStateChanged(ViewGroup.java:6479) at android.view.View.refreshDrawableState(View.java:18108) at android.view.View.dispatchAttachedToWindow(View.java:15589) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2955) at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:2962) at android.view.ViewGroup.addViewInner(ViewGroup.java:4510) at android.view.ViewGroup.addView(ViewGroup.java:4312) at android.view.ViewGroup.addView(ViewGroup.java:4252) at android.view.ViewGroup.addView(ViewGroup.java:4225) at androidx.viewpager2.adapter.FragmentStateAdapter.addViewToContainer(FragmentStateAdapter.java:406) at androidx.viewpager2.adapter.FragmentStateAdapter.placeFragmentInViewHolder(FragmentStateAdapter.java:328) at androidx.viewpager2.adapter.FragmentStateAdapter.onViewAttachedToWindow(FragmentStateAdapter.java:273) at androidx.viewpager2.adapter.FragmentStateAdapter.onViewAttachedToWindow(FragmentStateAdapter.java:73) at androidx.recyclerview.widget.RecyclerView.dispatchChildAttached(RecyclerView.java:8377) at androidx.recyclerview.widget.RecyclerView$5.addView(RecyclerView.java:954) at androidx.recyclerview.widget.ChildHelper.addView(ChildHelper.java:131) at androidx.recyclerview.widget.RecyclerView$LayoutManager.addViewInt(RecyclerView.java:9430) at androidx.recyclerview.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:9388) at androidx.recyclerview.widget.RecyclerView$LayoutManager.addView(RecyclerView.java:9375) at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1676) at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1622) at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:687) at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4645) at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:4348) at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4919) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at androidx.viewpager2.widget.ViewPager2.onLayout(ViewPager2.java:535) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at com.google.android.material.appbar.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:149) at com.google.android.material.appbar.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:43) at androidx.coordinatorlayout.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:953) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1762) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1606) at android.widget.LinearLayout.onLayout(LinearLayout.java:1515) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1762) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1606) at android.widget.LinearLayout.onLayout(LinearLayout.java:1515) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:325) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout(DecorView.java:774) at android.view.View.layout(View.java:17702) at android.view.ViewGroup.layout(ViewGroup.java:5631) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2519) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2234) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1372) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6774) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:926) at android.view.Choreographer.doCallbacks(Choreographer.java:735) at android.view.Choreographer.doFrame(Choreographer.java:667) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:912) at android.os.Handler.handleCallback(Handler.java:761) at android.os.Handler.dispatchMessage(Handler.java:98) at android.os.Looper.loop(Looper.java:156) at android.app.ActivityThread.main(ActivityThread.java:6517) at java.lang.reflect.Method.invoke(Method.java) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)

[ytheekshana]

issue_e8d416eb9c74624e947f5fa014f3d547.txt
Here's the full crash log from crashlytics

[ytheekshana]

This is my layout file.

`<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/cordMain"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/root_background">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/transparent"
        app:liftOnScrollColor="@android:color/transparent">

        <com.google.android.material.card.MaterialCardView
            style="@style/Widget.Material3.CardView.Elevated"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:layout_marginTop="10dp"
            android:layout_marginEnd="10dp"
            android:layout_marginBottom="5dp"
            app:cardCornerRadius="10dp">

            <com.google.android.material.appbar.MaterialToolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="50dp"
                app:menu="@menu/menu_main"
                app:titleTextAppearance="@style/ToolbarTextAppearance" />
        </com.google.android.material.card.MaterialCardView>

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:layout_marginStart="10dp"
            android:layout_marginEnd="10dp"
            android:background="@android:color/transparent"
            app:tabIndicator="@drawable/tab_indicator"
            app:tabIndicatorAnimationDuration="@integer/material_motion_duration_short_1"
            app:tabIndicatorAnimationMode="elastic"
            app:tabIndicatorColor="@color/colorPrimary"
            app:tabIndicatorFullWidth="true"
            app:tabIndicatorGravity="center"
            app:tabIndicatorHeight="32dp"
            app:tabInlineLabel="false"
            app:tabMode="scrollable"
            app:tabSelectedTextColor="@color/text_color" />

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>`