gistfile1.txt

<?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"
    >

  <android.support.design.widget.AppBarLayout
      android:id="@+id/appbar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="@android:color/transparent"
      android:theme="@style/AppTheme.AppBarOverlay"
      >
    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@android:color/transparent"
        app:layout_scrollFlags="scroll|enterAlways|snap"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
  </android.support.design.widget.AppBarLayout>

  <android.support.design.widget.FloatingActionButton
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_margin="@dimen/fab_margin"
      app:backgroundTint="@color/colorPrimary"
      app:fabSize="normal"
      app:layout_anchor="@+id/frame_layout"
      app:layout_anchorGravity="bottom|right|end"
      app:srcCompat="@drawable/ic_add"
      android:visibility="gone"
  />
//fragment with a recycleview inside
  <FrameLayout
      android:id="@+id/frame_layout"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      app:layout_behavior="@string/appbar_scrolling_view_behavior"
      />
      
</android.support.design.widget.CoordinatorLayout>