Scroll aware FAB hides, but then does not reappear

Question

I have made an Android app with a recyclerview and a floating action button. When scrolling down, the button should hide, when scrolling up it should show again. I have used this tutorial to implement the behavior.

The result is, that the FAB hides when I scroll down, but when scrolling up it does not reappear again :( The class ScrollAwareFABBehavior is identical from the tutorial. But I'm using nested layouts.

Here is my layout (the recyclerview is in a LinearLayout in content_main):

<android.support.design.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"
    android:fitsSystemWindows="true"
    tools:context="org.myorganisation.mypackage.someActivity">

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

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

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/add_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/plus"
        app:layout_behavior="org.myorganisation.mypackage.someActivity.helpers.ScrollAwareFABBehavior" />

    <LinearLayout
        android:id="@+id/insert_alert"
        android:layout_width="wrap_content"
        android:layout_height="50sp"
        android:layout_margin="@dimen/fab_margin"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingEnd="70sp"
        android:visibility="gone"
        app:layout_anchor="@id/add_fab"
        app:layout_anchorGravity="bottom|left">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:text="@string/initial_alert"
            android:textColor="@color/colorPrimaryDark"
            android:textStyle="bold|italic" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_keyboard_arrow_right_black_24sp"
            android:tint="@color/colorPrimary" />
    </LinearLayout>

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

Answer 1

As of version 25.1.0 of the Support Library, hidden views no longer scroll events as per this bug.

As mentioned in comment #5:

This is working as intended, your dependency chain is the wrong way. Your RecyclerView (Behavior) should be triggering the FAB visibility change.

Answer 2

As for support library version 25.1.0, the solution is here.