android - Scroll behavior in nested RecyclerView with horizontal scroll

Question

I have to create vertical RecyclerView with nested horizontal RecyclerView in every item. Everything is within CoordinatorLayout. When I scroll by tapping outside nested RecyclerView toolbar hides, but when I scroll parent Recycler by tapping on nested one toolbar stays.

Any help would be appreciated.

Here is my xml layouts:

main_activity.xml:

<android.support.design.widget.CoordinatorLayout 
   ...>

<FrameLayout
    android:id="@+id/fragment_frame"
    ...
    android:fitsSystemWindows="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

<android.support.design.widget.AppBarLayout
    ...
    android:fitsSystemWindows="true"
    android:id="@+id/appbar_layout">

        <include layout="@layout/toolbar"/>

</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>

Here is toolbar.xml :

<android.support.v7.widget.Toolbar
    android:id="@+id/main_toolbar"
    ...
    android:fitsSystemWindows="true"
    app:layout_scrollFlags="scroll|enterAlways">

    <TextView .../>

</android.support.v7.widget.Toolbar>

fragment.xml:

<android.support.v7.widget.RecyclerView
    ...
    android:scrollbars="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

And recycler_view_item.xml:

<RelativeLayout ...>

    <TextView .../>

    <!-- fixme(CullyCross) fix bug with hiding toolbar -->
    <android.support.v7.widget.RecyclerView
        ...
        android:scrollbars="horizontal"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        />

</RelativeLayout>

Thanks,
Anton

Answer 1

As requested here is the solution I found good enough so far:

In my case I have a nestedScrollView with 4 RecyclerViews set to scroll horizontally inside. For each of those RecyclerViews I have done this programatically:

restaurantsRecylerView.setHasFixedSize(true); 
restaurantsRecylerView.setNestedScrollingEnabled(false);

You probably don't want the fixedSize, not sure if it will make any difference, my list is always 25 so I can use that for performance. After having done this I can scroll without issues even when I touch on the recyclerViews

Hope it helps