android - Float action button anchor with include layout -


do know if possible use id views included in layout anchor of fab ? example :

<include layout="@layout/content_main" />  <android.support.design.widget.floatingactionbutton     android:id="@+id/fab"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     app:layout_anchor="@id/map"     app:layout_anchorgravity="bottom|right|end"     android:layout_margin="@dimen/fab_margin"     android:src="@android:drawable/ic_menu_add" /> 

"@id/map" inside inclued layout content_main.

with code follow error:

error:(30, 28) no resource found matches given name (at 'layout_anchor' value '@id/map').

for information i'm use include trying reduce main layout size.

it seem "@id/map" not visible fab anchor. perhaps doing wrong.

i guess missing tag id android:id="@+id/map"

open @layout/content_main

floating action buttons used special type of promoted action. distinguished circled icon floating above ui , have special motion behaviors related morphing, launching, , transferring anchor point.

error:(30, 28) no resource found matches given name (at 'layout_anchor' value '@id/map'). 

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