Android实现顶部悬浮效果

<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.SwipeRefreshLayout 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/swipeRefreshLayout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".ui.activity.NewPersonalCardActivity"> <android.support.design.widget.CoordinatorLayout  android:id="@+id/rootLayout"  android:layout_width="match_parent"  android:layout_height="match_parent">  <android.support.design.widget.AppBarLayout   android:id="@+id/appBarLayout"   android:layout_width="match_parent"   android:layout_height="wrap_content">   <android.support.design.widget.CollapsingToolbarLayout    android:id="@+id/collapsingToolbarLayout"    android:layout_width="match_parent"    android:layout_height="192dp"    app:layout_scrollFlags="scroll|exitUntilCollapsed"    app:titleEnabled="false">    <LinearLayout     android:id="@+id/headLayout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     app:layout_collapseMode="pin"     app:layout_collapseParallaxMultiplier="0.7">     <include layout="@layout/personal_new_top" />    </LinearLayout>    <android.support.v7.widget.Toolbar     android:id="@+id/toolBar"     android:layout_width="match_parent"     android:layout_height="44dp"     android:background="@color/white"     android:navigationIcon="@drawable/icon_back"     app:contentInsetLeft="0dp"     app:contentInsetStart="0dp"     app:layout_collapseMode="pin"     app:navigationIcon="@drawable/icon_back">     <TextView      android:layout_width="wrap_content"      android:layout_height="wrap_content"      android:layout_gravity="center"      android:singleLine="true"      android:textColor="@color/c333333"      android:textSize="16sp"      tools:text="讲师" />    </android.support.v7.widget.Toolbar>   </android.support.design.widget.CollapsingToolbarLayout>   <include layout="@layout/new_personal_tabs" />  </android.support.design.widget.AppBarLayout>  <android.support.v4.widget.NestedScrollView   android:id="@+id/nestedScrollView"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:fillViewport="true"   android:scrollbars="none"   app:layout_behavior="@string/appbar_scrolling_view_behavior">   <android.support.v4.view.ViewPager    android:id="@+id/viewPager"    android:layout_width="match_parent"    android:layout_height="match_parent"    app:layout_behavior="@string/appbar_scrolling_view_behavior" />  </android.support.v4.widget.NestedScrollView> </android.support.design.widget.CoordinatorLayout></android.support.v4.widget.SwipeRefreshLayout>