sheishuoAPP/app/res/layout/circle_of_friends_fragment.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"
    android:id="@+id/main_content"
    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="256dp"
        android:fitsSystemWindows="true">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            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">



            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                app:layout_collapseMode="parallax"
                android:fitsSystemWindows="true"   >
                <ImageView
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:scaleType="centerCrop"/>

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:layout_alignParentBottom="true"
                    android:layout_marginStart="40dp"
                    android:layout_marginLeft="40dp"
                    android:layout_marginBottom="40dp">
                    <ImageView
                        android:id="@+id/activity_main_avatar"
                        android:layout_width="48dp"
                        android:layout_height="48dp"
                        android:textStyle="bold"
                        android:textSize="30sp" />
                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:text="冯超"
                        android:textSize="33sp"
                        android:gravity="center"
                        android:textColor="@android:color/white"
                        />
                </LinearLayout>

            </RelativeLayout>

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

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



    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">


        <android.support.v7.widget.RecyclerView
            android:id="@+id/activity_recyclerview"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
    </LinearLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/activity_details_fab"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        app:layout_anchor="@id/appbar"
        app:layout_anchorGravity="bottom|right|end"
        android:src="@drawable/ic_add_friends"
        android:layout_margin="24dp"
        android:clickable="true"/>

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