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`<android.support.design.widget.AppBarLayout android:id="@+id/appbar" android:layout_width="match_parent" android:layout_height="@dimen/expert_toolbar_height" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:contentScrim="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <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/ThemeOverlay.AppCompat.Light"/>

        <com.netease.money.widgets.design.CollapsingAvatarToolbar
            android:id="@+id/stuff_container"
            android:layout_width="wrap_content"
            android:layout_height="?attr/actionBarSize">


            <ImageView
                android:id="@id/cat_avatar"
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:layout_gravity="center_vertical"
                android:scaleType="centerCrop"
                android:src="@drawable/setting_no_login_photo"
                app:border_color="@color/profiles_circle_border"
                app:border_width="5dp"
                />


            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginLeft="16dp"
                android:orientation="vertical">

                <TextView
                    android:id="@id/cat_title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:fontFamily="sans-serif-medium"
                    android:text="Title"
                    android:textColor="@color/white"
                    android:textSize="18dp"/>

                <TextView
                    android:id="@+id/subtitle"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Subtitle"
                    android:textColor="#80ffffff"
                    android:textSize="15dp"/>
            </LinearLayout>
        </com.netease.money.widgets.design.CollapsingAvatarToolbar>

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


    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</android.support.design.widget.AppBarLayout>`

can scroll up but cannot scroll down