I have a view that acts like BottomSheetBehavior and this view has ViewPager2 inside. Each ViewPager2's page is a vertical RecyclerView. The issue is that BottomSheet doesn't scroll down when current vertical RecyclerView (which is a page of ViewPager) can't scroll vertically anymore. Everything works file when instead of ViePager I have only one vertical RecyclerView.
The temporary solution is to wrap ViewPager with NestedScrollView but it's horrible for performance and has it's own bugs.
The original layout:
<?xml version="1.0" encoding="utf-8"?>
<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/core"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#C7C7C7"
tools:context=".MainActivity">
<LinearLayout
android:id="@+id/bottom_sheet"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:elevation="8dp"
android:orientation="vertical"
app:behavior_hideable="true"
app:behavior_peekHeight="300dp"
app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="wrap_content"
android:layout_height="24dp"
android:layout_gravity="center_horizontal"
app:tabGravity="center"
app:tabMode="scrollable" />
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
[Here's how it looks (sorry for the gif quality)]
I've found a solution for this case, I set isNestedScrollingEnabled = false
for inner RecyclerView so that BottomSheetBehavior finds another scrolling view
viewPager.children.find { it is RecyclerView }?.let {
(it as RecyclerView).isNestedScrollingEnabled = false
}
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