android – 如何以编程方式删除我的NestedScrollView的布局行为？

我已经在myCollapsingToolbarLayout中删除了layout_scrollFlags.但我需要删除我的nestedScrollView的layouT_Behavior,以便当我的嵌套滚动视图上没有内容时,工具栏的折叠也将被禁用.删除我的nestedScrollView的layouT_Behavior非常简单,我只是逐字地删除xml中的代码行,但是如何以编程方式删除它？

我的xml：

<android.support.design.widget.CoordinatorLayout
            xmlns:android="http://scheR_80_11845@as.android.com/apk/res/android"
            xmlns:app="http://scheR_80_11845@as.android.com/apk/res-auto"

            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="wrap_content"
                android:fitsSystemWindows="true"
                android:BACkground="@android:color/white">

                <android.support.design.widget.CollapsingToolbarLayout
                    android:id="@+id/collapsing_toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:fitsSystemWindows="true"
                    app:contentScrim="?attr/colorPriMary"
                    app:layout_scrollFlags="scroll|exitUntilCollapsed">

                    <fragment
                        android:id="@+id/pawfile_header"
                        android:name="com.lightbulb.pawesome.fragments.PawfileHeaderFragment"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="10dp"
                        android:layout_marginTop="10dp"
                        android:fitsSystemWindows="true"
                        app:layout_collapseMode="parallax" />

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

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

            <fragment
                android:id="@+id/pawfile_timeline"
                android:name="com.lightbulb.pawesome.user_timeline.PawesomeUserTimelineFragment"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layouT_Behavior="@String/appbar_scrolling_view_behavior" />

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

CoordinatorLayout.LayoutParams coordinatorLayoutParams = (CoordinatorLayout.LayoutParams) pawfileTimeline.getLayoutParams();
coordinatorLayoutParams.setBehavior(null);

AppBarLayout.LayoutParams toolbarLayoutParams = (AppBarLayout.LayoutParams) toolbar.getLayoutParams();
toolbarLayoutParams.setScrollFlags(0);