[AppBarLayout] AppBarLayout does not collapse/expand when scrolling vertically over horizontal RecyclerView inside vertical RecyclerView

Description: When vertical RecyclerView has a horizontal RecyclerView and if user starts scrolling vertically with finger on horizontal RecyclerView then AppBarLayout does not move at all. If finger was on other list items then AppBarLayout does change its state.

The problem is still there with CollapsingToolbarLayout inside AppBarLayout.

Expected behavior: AppBarLayout should scroll

Source code: I created a test project where you can see the problem. https://github.com/MaratTursynbek/AppBarLayout-bug

Code of CollapsibleToolbar is taken from this article.

<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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/app_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="76dp"
        android:theme="@style/AppTheme.AppBarOverlay.Light">

        <com.example.notcollapsingappbar.CollapsibleToolbar
            android:id="@+id/motion_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:minHeight="@dimen/actionBarSize"
            app:layoutDescription="@xml/scene_header"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:popupTheme="@style/AppTheme.PopupOverlay" />

            <TextView
                android:id="@+id/toolbar_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="start|center_vertical"
                android:text="Large title"
                android:textColor="@android:color/white"
                android:textSize="30sp"
                app:autoSizeTextType="uniform" />

        </com.example.notcollapsingappbar.CollapsibleToolbar>

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

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:paddingBottom="16dp"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

Android API version: All versions from API 21

Material Library version: 1.2.1

Device: OnePlus 5t, Pixel 3, Pixel 3 emulator, Samsung A10

[PallabJunior]

I had the same issue and android:nestedScrollingEnabled=“false” does solve it for the nested recyclerviews. But I have a horizontal ViewPager inside a vertical recyclerView which is giving me this same issue and cann’t be resolved by using android:nestedScrollingEnabled =false.

What is the solution for that?

[araujotadeu]

What’s the solution to this issue? I am having the same problem as PallabJunior, not working with a ViewPager2.