创建一个视差滑动效果的布局

ScrollActivity.xml

<?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:layout_width="match_parent"
	android:layout_height="match_parent"
	android:fitsSystemWindows="true"
	tools:context="com.flying.xiaopo.poishuhui_kotlin.ui.activity.BookDetailActivity">

	<android.support.design.widget.AppBarLayout
		android:id="@+id/appbar"
		android:layout_width="match_parent"
		android:layout_height="@dimen/appbar_image_height"
		android:fitsSystemWindows="true"
		android:theme="@style/ThemeOverlay.AppCompat.Dark">

		<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:expandedTitleMarginEnd="64dp"
			app:expandedTitleMarginStart="48dp"
			app:layout_scrollFlags="scroll|exitUntilCollapsed">

			<ImageView
				android:id="@+id/backgroundImage"
				android:layout_width="match_parent"
				android:layout_height="match_parent"
				android:fitsSystemWindows="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"
				app:layout_collapseMode="pin"
				app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>

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

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

	<android.support.design.widget.FloatingActionButton
		app:rippleColor="@color/material_amber_50"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_margin="@dimen/fab_margin"
		android:clickable="true"
		android:src="@mipmap/ic_github"
		app:layout_anchor="@id/appbar"
		app:layout_anchorGravity="bottom|right|end"/>

	<android.support.v4.widget.SwipeRefreshLayout
		android:id="@+id/pageRefresh"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		app:layout_behavior="@string/appbar_scrolling_view_behavior">

		<android.support.v7.widget.RecyclerView
			android:id="@+id/pageList"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:paddingBottom="8dp"
			android:paddingLeft="8dp"
			android:paddingRight="8dp"
			android:paddingTop="16dp"
			/>
	</android.support.v4.widget.SwipeRefreshLayout>
</android.support.design.widget.CoordinatorLayout>