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I want to have two FloatingActionButtons in my CoordinatorView. But when I try to add margin to the top FloatingActionButton, It applies from end of the view - It should add space between FloatingActionButtons.
XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
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">
<android.support.design.widget.FloatingActionButton
android:id="#+id/wordpackAddButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="16dp"
android:src="#drawable/add"
app:elevation="5dp"
app:layout_anchor="#id/wordpacks_list"
app:layout_anchorGravity="bottom|right|end" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/importWordpack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_marginBottom="16dp"
android:src="#drawable/add"
app:elevation="5dp"
app:layout_anchor="#id/wordpackAddButton"
app:layout_anchorGravity="top" />
<ListView
android:id="#+id/wordpacks_list"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
</android.support.design.widget.CoordinatorLayout>

I have faced a similar problem while implementing a FAB Menu.
You can solve this problem by wrapping the second FAB in a FrameLayout like so:
<android.support.design.widget.FloatingActionButton
android:id="#+id/wordpackAddButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="16dp"
app:elevation="5dp"
app:layout_anchorGravity="bottom|right|end" />
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="56dp"
app:layout_anchor="#id/wordpackAddButton"
app:layout_anchorGravity="top|right">
<android.support.design.widget.FloatingActionButton
android:id="#+id/importWordpack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_margin="16dp"
app:elevation="5dp"
app:layout_anchor="#id/wordpackAddButton" />
</FrameLayout>
This might be a bit of a hacky solution but it is simple and it works. The padding value of the FrameLayout is set to 56dp since that is the size of the FAB.

Add this view after Fab button and change top level fab's
layout_anchor to transparent_view.
<View
android:layout_width="8dp"
app:layout_anchor="#id/wordpackAddButton"
app:layout_anchorGravity="top"
app:useCompatPadding="false"
android:layout_gravity="end"
android:background="#android:color/transparent"
android:id="#+id/transparent_view"
android:layout_height="8dp"/>
Hope it helps.

SOLUTION 1:
Add another View to make a gap between two FAB's. Set the anchor of View to top position of the wordpackAddButton and set the anchor of importWordpack to top-right position of the View.
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
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">
<android.support.design.widget.FloatingActionButton
android:id="#+id/wordpackAddButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="16dp"
android:src="#drawable/add"
app:elevation="5dp"
app:layout_anchor="#id/wordpacks_list"
app:layout_anchorGravity="bottom|right|end" />
<View
android:id="#+id/gap"
android:layout_width="16dp"
android:layout_height="16dp"
app:layout_anchor="#id/wordpackAddButton"
app:layout_anchorGravity="top">
</View>
<android.support.design.widget.FloatingActionButton
android:id="#+id/importWordpack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:src="#drawable/add"
app:elevation="5dp"
app:layout_anchor="#id/gap"
app:layout_anchorGravity="top|center" />
<ListView
android:id="#+id/wordpacks_list"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</android.support.design.widget.CoordinatorLayout>
SOLUTION 2:
Wrap two FAB into a LinearLayout and anchor this layout to the bottom-right position of ListView.
Here is an workaround:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
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="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_anchor="#id/wordpacks_list"
app:layout_anchorGravity="bottom|right|end"
android:layout_margin="16dp"
android:background="#android:color/transparent"
android:clipToPadding="false">
<android.support.design.widget.FloatingActionButton
android:id="#+id/importWordpack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:src="#drawable/add"
app:elevation="5dp" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/wordpackAddButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="16dp"
android:src="#drawable/add"
app:elevation="5dp" />
</LinearLayout>
<ListView
android:id="#+id/wordpacks_list"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</android.support.design.widget.CoordinatorLayout>
OUTPUT: