Mostrar y ocultar FloatingActionButton al desplazar

En la Clase:

public class FabScrollBehavior extends FloatingActionButton.Behavior {

public FabScrollBehavior(Context context, AttributeSet attributeSet) {
super();
}

@Override
public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull FloatingActionButton child, @NonNull View directTargetChild, @NonNull View target, int axes, int type) {
return axes == ViewCompat.SCROLL_AXIS_VERTICAL
|| super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, axes, type);
}

@Override
public void onNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull final FloatingActionButton child, @NonNull View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, int type, @NonNull int[] consumed) {
super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, type, consumed);

if (dyConsumed > 0 && child.getVisibility() == View.VISIBLE) {

child.hide(new FloatingActionButton.OnVisibilityChangedListener() {
@Override
public void onHidden(FloatingActionButton fab) {
super.onShown(fab);
fab.setVisibility(View.INVISIBLE);
}
});
} else if (dyConsumed < 0 && child.getVisibility() != View.VISIBLE) {

child.postDelayed(new Runnable() {
@Override
public void run() {
child.show();
}
}, 200L);
}
}
}

Asignación del behavior al FloatingActionButton:

<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
app:layout_behavior="com.el_nombre_de_tu_paquete.FabScrollBehavior"
app:srcCompat="@drawable/ic_add" />