android - CoordinateLayout app:layout_anchor and app:layout_anchorGravity not working in fragments -


i'm using coordinatelayout in fragment's layout file. there need use floatingactionbutton or imagebutton between 2 layouts. got sample code this answer.

i created 2 fragments 2 same layout file. fragment1.xml, fragment2.xml 

<android.support.design.widget.coordinatorlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent">  <linearlayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">      <linearlayout         android:id="@+id/viewa"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_weight="0.4"         android:background="@android:color/holo_purple"         android:orientation="horizontal"/>      <linearlayout         android:id="@+id/viewb"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_weight="0.6"         android:background="@android:color/holo_orange_light"         android:orientation="horizontal"/>  </linearlayout>  <android.support.design.widget.floatingactionbutton     android:id="@+id/fab"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_margin="16dp"     android:clickable="true"     android:src="@drawable/icon_add_new"     app:layout_anchor="@id/viewa"     app:layout_anchorgravity="bottom|right|end"/>  </android.support.design.widget.coordinatorlayout>

when run app fragment1 show after button click fragment2 show. when replacing first fragment second fragment button position changed top left corner below.

fragment 1

fragment1

fragment 2

enter image description here

i can't understand why? can me?


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