滑动栏效果

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     >
 7 
 8     <android.support.design.widget.AppBarLayout
 9         android:layout_width="match_parent"
10         android:layout_height="200dp">
11 
12         <android.support.design.widget.CollapsingToolbarLayout
13             android:layout_width="match_parent"
14             android:layout_height="match_parent"
15             android:theme="@style/Theme.AppCompat.DayNight.DarkActionBar"
16             app:layout_scrollFlags="scroll|exitUntilCollapsed"
17             android:background="@android:color/white">
18             <!-- 。。。顶部布局。。。-->
19 
20         </android.support.design.widget.CollapsingToolbarLayout>
21 
22     </android.support.design.widget.AppBarLayout>
23 
24     <!--
25          android:fillViewport="true"
26          在ScrollView中嵌套 viewpager
27         必须设置android:fillViewport="true"
28     -->
29 
30     <android.support.v4.widget.NestedScrollView
31         android:layout_width="match_parent"
32         android:layout_height="match_parent"
33         android:fillViewport="true"
34         app:layout_behavior="@string/appbar_scrolling_view_behavior">
35         <!--  。。。底部布局。。。-->
36         <!--只能有一个直接子布局-->
37         
38     </android.support.v4.widget.NestedScrollView>
39 </android.support.design.widget.CoordinatorLayout>