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在Android中,如果NestedScrollView内容不足以滚动,如何让CollapsingToolbar停止折叠？此功能目前存在于Android 5.1.1上的"联系人"应用中.但是,在我的代码中,当NestedScrollView停止滚动时,工具栏继续折叠,两者之间留下间隙.

<?xml version="1.0" encoding="utf-8"?>
<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:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="256dp"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginStart="@dimen/content_padding_normal"
            app:expandedTitleMarginEnd="64dp">
            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:titleTextAppearance="@style/ActionBar.TitleText"
                app:layout_collapseMode="pin" />
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>
    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:scrollbars="none">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingBottom="@dimen/keyline_2">
            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/element_spacing_normal">
                <include
                    layout="@layout/ViewLoadingIndeterminate" />
                <LinearLayout
                    android:id="@+id/progress_status_container"
                    style="@style/ConnectionFieldContainer"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:orientation="vertical"
                    android:visibility="visible">
                    <Spinner
                        android:id="@+id/progress_status"
                        android:layout_width="match_parent"
                        style="@style/Text.ConnectionField" />
                    <TextView
                        style="@style/Text.ConnectionLabel"
                        android:text="@string/mobile.customer.connect.progress.status" />
                </LinearLayout>
            </android.support.v7.widget.CardView>
            <android.support.v7.widget.CardView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="@dimen/element_spacing_normal">
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="vertical">
                    <LinearLayout
                        android:id="@+id/email1_container" …