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我想在CoordinatorView中有两个FloatingActionButtons.但是当我尝试向顶部FloatingActionButton添加边距时,它从视图的末尾开始应用 - 它应该在FloatingActionButtons之间添加空格.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>