CoordinatorLayout

<?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"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@android:color/background_light"     android:fitsSystemWindows="true"     >      <android.support.design.widget.AppBarLayout         android:id="@+id/main.appbar"         android:layout_width="match_parent"         android:layout_height="300dp"         android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"         android:fitsSystemWindows="true"         >          <android.support.design.widget.CollapsingToolbarLayout             android:id="@+id/main.collapsing"             android:layout_width="match_parent"             android:layout_height="match_parent"             app:layout_scrollFlags="scroll|exitUntilCollapsed"             android:fitsSystemWindows="true"             app:contentScrim="?attr/colorPrimary"             app:expandedTitleMarginStart="48dp"             app:expandedTitleMarginEnd="64dp"             >              <ImageView                 android:id="@+id/main.backdrop"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:scaleType="centerCrop"                 android:fitsSystemWindows="true"                 android:src="@drawable/material_flat"                 app:layout_collapseMode="parallax"                 />              <android.support.v7.widget.Toolbar                 android:id="@+id/main.toolbar"                 android:layout_width="match_parent"                 android:layout_height="?attr/actionBarSize"                 app:popupTheme="@style/ThemeOverlay.AppCompat.Light"                 app:layout_collapseMode="pin"                 />         </android.support.design.widget.CollapsingToolbarLayout>     </android.support.design.widget.AppBarLayout>      <android.support.v4.widget.NestedScrollView         android:layout_width="match_parent"         android:layout_height="match_parent"         app:layout_behavior="@string/appbar_scrolling_view_behavior"         >          <TextView             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:textSize="20sp"             android:lineSpacingExtra="8dp"             android:text="@string/lorem"             android:padding="@dimen/activity_horizontal_margin"             />     </android.support.v4.widget.NestedScrollView>      <android.support.design.widget.FloatingActionButton         android:layout_height="wrap_content"         android:layout_width="wrap_content"         android:layout_margin="@dimen/activity_horizontal_margin"         android:src="@drawable/ic_comment_24dp"         app:layout_anchor="@id/main.appbar"         app:layout_anchorGravity="bottom|right|end"compile 'com.android.support:design:23.0.1'

<CoordinatorLayout>     <AppbarLayout/>     <scrollableView/>     <FloatingActionButton/></CoordinatorLayout>