Панель инструментов прокрутки после setNestedScrollEnabled (false)

Question

У меня проблема с прокруткой панели инструментов на фрагменты. В activity_main.xml Прошел фрагмент (NestedScrollView или RecyclerView) в FrameLayout. На фрагменте с прокруткой RecyclerView заблокирован mRecyclerView.setNestedScrollingEnabled (false). Но панель инструментов продолжает двигаться вверх/вниз. Если перед этим нажмите на FrameLayout (с фрагментом_profile.xml), панель инструментов заблокирована (как и должно быть).

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:id="@+id/drawer_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true"> 

<android.support.design.widget.CoordinatorLayout 
    android:id="@+id/coordinator_layout" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:fitsSystemWindows="true"> 

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

    <android.support.design.widget.CollapsingToolbarLayout 
     app:title=" " 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:contentScrim="@color/colorPrimary" 
     android:fitsSystemWindows="true" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"> 

    <ImageView 
     android:layout_width="match_parent" 
     android:layout_height="@dimen/toolbar_image_height" 
     android:src="@drawable/header_background" 
     android:scaleType="fitXY" 
     app:layout_collapseMode="parallax" 
     android:fitsSystemWindows="true"/> 

    <android.support.v7.widget.Toolbar 
     android:id="@+id/toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/actionBarSize" 
     app:layout_collapseMode="pin" 
     android:clipToPadding="true"/> 

       <com.sloydev.collapsingavatartoolbar.CollapsingAvatarToolbar 
        android:layout_width="wrap_content" 
        android:layout_height="?attr/actionBarSize" 
        app:collapsedImageSize="32dp" 
        app:expandedImageSize="@dimen/nav_photo_size" 
        app:expandedTextSize="@dimen/toolbar_expanded_text_size" 
        android:fitsSystemWindows="true"> 

        <de.hdodenhof.circleimageview.CircleImageView 
         android:layout_gravity="bottom" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" 
         android:src="@drawable/avatar" 
         android:id="@+id/cat_avatar" 
         android:layout_marginBottom="@dimen/view_padding" 
         android:fitsSystemWindows="true"/> 

        <TextView 
         android:id="@+id/cat_title" 
         android:layout_width="wrap_content" 
         android:layout_height="wrap_content" 
         android:fontFamily="@string/roboto.regular" 
         android:textColor="@color/title_color" 
         android:layout_gravity="bottom" 
         android:layout_marginBottom="@dimen/view_padding" 
         android:layout_marginLeft="@dimen/view_padding" 
         android:fitsSystemWindows="true"/> 

       </com.sloydev.collapsingavatartoolbar.CollapsingAvatarToolbar> 

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

     <FrameLayout 
      android:id="@+id/fragmentContainer" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:fitsSystemWindows="true" 
      app:layout_behavior="@string/appbar_scrolling_view_behavior"/> 

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

    <android.support.design.widget.NavigationView 
     android:id="@+id/navigation_view" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_gravity="start" 
     app:headerLayout="@layout/navigation_header" 
     app:menu="@menu/drawer_menu"/> 

</android.support.v4.widget.DrawerLayout> 

fragment_profile.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"/> 

fragment_contacts.xml

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v7.widget.RecyclerView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/contacts_recyclerview" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"/> 

ContactsFragment.java

private RecyclerView mRecyclerView; 
public void onActivityCreated(@Nullable Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 
mRecyclerView = (RecyclerView) getActivity().findViewById(R.id.contacts_recyclerview); 
    mRecyclerView.setNestedScrollingEnabled(false); 
    appBar.setExpanded(false); 
} 

Answer 1

Решить проблему, добавили в AppBarLayout.Behavior DragCallback с возвратом ложной; https://stackoverflow.com/a/34112103/5886355