text: <?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.ocnyang.contourviewdemo.ContourActivity">
  
      <android.support.design.widget.AppBarLayout
          android:id="@+id/app_bar"
          android:layout_width="match_parent"
          android:layout_height="@dimen/app_bar_height"
          android:fitsSystemWindows="true"
          android:theme="@style/AppBarOverlay">
  
          <android.support.design.widget.CollapsingToolbarLayout
              android:id="@+id/toolbar_layout"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:fitsSystemWindows="true"
              app:contentScrim="?attr/colorPrimary"
              app:layout_scrollFlags="scroll|exitUntilCollapsed"
              app:toolbarId="@+id/toolbar">
  
              <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/PopupOverlay"/>
  
          </android.support.design.widget.CollapsingToolbarLayout>
      </android.support.design.widget.AppBarLayout>
  
      <include layout="@layout/content_contour"/>
  
      <android.support.design.widget.FloatingActionButton
          android:id="@+id/fab"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_margin="@dimen/fab_margin"
          app:layout_anchor="@id/app_bar"
          app:layout_anchorGravity="bottom|end"
          app:srcCompat="@drawable/github"/>
  
  </android.support.design.widget.CoordinatorLayout>
  