Android: How to set view to scroll away while positioning it between two pinned views?

I have a fixed toolbar, a view with layout_scrollFlags="scroll", a fixed view for filtering and a recycler view, in this respective order from top to bottom in a CoordinatorLayout.

This is what I have been able to achieve so far:

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<!-- language: lang-html -->

<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white">
<RelativeLayout
android:id="@+id/scrollAwayView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="16dp"
app:layout_scrollFlags="scroll">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="Scroll Away View"
android:textColor="@color/black"
android:textSize="20sp" />
</RelativeLayout>
<com.google.android.material.appbar.MaterialToolbar
android:id="@+id/fixedToolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/apl_grayscale_050"
app:title="Fixed Toolbar"
app:titleTextColor="@color/black" />
<HorizontalScrollView
android:id="@+id/horizontalScroll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:clipToPadding="false"
android:gravity="bottom"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:scrollbars="none">
<com.google.android.material.chip.ChipGroup
android:id="@+id/chipGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:singleLine="true" />
</HorizontalScrollView>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

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The issue is: That the positioning is incorrect. The fixed toolbar should be on top while the scroll away view should be between the two pinned views: the fixed toolbar and the chip group list.

I read that the layout_scrollFlags=scroll has no effect when any sibling views
before this one do not have this flag. Any ideas on how I can achieve this behavior while keeping the position?

Desired positioning:

I was able to find a solution today, after a lot of trial and error.

The Solution

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<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.MaterialToolbar
android:id="@+id/fixedToolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#F5F5F5"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:title="Fixed Toolbar"
app:titleTextColor="@color/black" />
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/fixedToolbar">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/white">
<RelativeLayout
android:id="@+id/scrollAwayView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="16dp"
android:elevation="0dp"
app:layout_scrollFlags="scroll">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="Scroll Away View"
android:textColor="@color/black"
android:textSize="20sp" />
</RelativeLayout>
<HorizontalScrollView
android:id="@+id/horizontalScroll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:clipToPadding="false"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:scrollbars="none">
<com.google.android.material.chip.ChipGroup
android:id="@+id/chipGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:singleLine="true" />
</HorizontalScrollView>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

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The key points here:

• Place the view which is positioned on top of the scrollable layout, the fixedToolbar in a view that is outside of the parent Coordinator layout.
• For this solution I used ConstraintLayout to be the parent of the fixedToolbar and the CoordinatorLayout that is the parent of the rest of the view.

How I arrived at this solution

Inspecting the layout_scrollFlags, I saw the following information about the scroll flag:

> The view will be scroll in direct relation to scroll events. This flag
> needs to be set for any of the other flags to take effect. If any sibling
> views before this one do not have this flag, then this value has no
> effect.

Because I needed to position a view above the scrollAwayView I placed it in a view outside the Coordinator parent. Now that the fixedToolbar and the scrollAwayView are not sibling views, while being placed in the correct arrangement.