如何在CollapsingToolbarLayout上停止滚动

Question

我的折叠工具栏布局包含一张图片。我希望在说270dp之前停止滚动图像，然后只滚动剩余的内容。

我已经在Stackoverflow上关注了2个答案，但这似乎对我不起作用。

1. How to Stop scroll on CollapsingToolbarLayout so it doesn't completely collapse
2. How to Stop scroll on CollapsingToolbarLayout so it doesn't completely collapse

布局xml

       <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:animateLayoutChanges="true">


    <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:ads="http://schemas.android.com/apk/res-auto"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/coordinatorLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/app_bar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            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:contentScrim="?attr/colorPrimary"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">


                <ImageView
                    android:id="@+id/toolbar_imgview"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom"
                    android:adjustViewBounds="true"
                    android:scaleType="centerCrop"
                    app:layout_collapseMode="parallax" />

                <android.support.v7.widget.Toolbar

                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    android:background="@android:color/transparent"
                    app:layout_collapseMode="pin" />

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

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

        <android.support.v4.widget.NestedScrollView
            android:id="@+id/nestedscroll"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/app_bar_layout"
            android:background="#ffff"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <View
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/toolbar_shadow_height"
                    android:background="@drawable/shape_shadow" />

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:background="#ffff"
                    android:weightSum="1.0">

                    <Button
                        android:layout_width="0dip"
                        android:layout_height="40dp"
                        android:layout_alignParentEnd="true"
                        android:layout_alignParentRight="true"
                        android:layout_alignParentTop="true"
                        android:layout_marginRight="10dp"
                        android:layout_weight=".5"
                        android:background="@drawable/button_bg"
                        android:text="Set Wallpaper"
                        android:textColor="#ff4081"
                        android:textSize="12dp" />

                    <Button
                        android:layout_width="0dip"
                        android:layout_height="40dp"
                        android:layout_alignParentLeft="true"
                        android:layout_alignParentStart="true"
                        android:layout_alignParentTop="true"
                        android:layout_weight=".5"
                        android:background="@drawable/button_bg_dw"
                        android:text="Download"
                        android:textColor="#FFFF"
                        android:textSize="12dp" />

                </LinearLayout>


                <View
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="5dp"
                    android:background="?attr/dividerHorizontal" />


                <include
                    layout="@layout/activity_details"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" />


            </LinearLayout>

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


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

</RelativeLayout>

我已经尝试将AppBarLayout的高度设置为280dp，但没有用。 我正在通过Universal Image Loader设置图像。