CollapsingToolbarLayout

Implementar Collapsing ToolBar Layout

<?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=".vistas.PictureDetailActivity">

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/appbarlayout_height"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" >

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsingToolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        app:layout_scrollInterpolator="@android:anim/decelerate_interpolator"
        app:contentScrim="@color/colorPrimary">

        <ImageView
            android:id="@+id/imageHeader"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@android:drawable/sym_def_app_icon"
            android:scaleType="centerCrop"
             />

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar_picture_detail"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"
            >
        </android.support.v7.widget.Toolbar>

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

    <!-- HASTA AQUI LA CONFIGURACION -->

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="android.support.design.widget.AppBarLayout$ScrollingViewBehavior">

   <include layout="@layout/activity_picture_detail_content"/>

    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>