setNestedScrollEnabled后的工具栏滚动(false)

我无法在片段上滚动工具栏。在里面 活动_主.xml 我在FrameLayout中通过了片段(NestedScrollView或RecyclerView)。mRecyclerView阻止了Recycler View滚动的片段。setNestedScrollingEnabled(假)。但是工具栏继续上下移动。如果在此之前单击FrameLayout(带有fragment_profile.xml),工具栏将被阻止(应该如此)。

活动_主.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>

片段配置文件.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"/>

联系人片段.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);
}