如何使用浮动工具栏将浮动操作按钮放置在屏幕底部，以使其始终可见

Question

I have fragment with floating action button inside activity with collapsing toolbar. When toolbar is collapsed everything is ok, but when it's expended, FAB is not visible (it's below the screen). Here is xml of my fragment with FAB:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/layout">


<ListView
    android:id="@+id/listView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

</RelativeLayout>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_anchor="@+id/layout"
    app:layout_anchorGravity="bottom|right|end"
    />


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

Answer 1

replace

app:layout_anchor="@+id/layout"
app:layout_anchorGravity="bottom|right|end"

with

android:layout_gravity="bottom|end"

This should work