Two floating action buttons next to each other

Question

It is a combination of layout gravity and anchor gravity together with playing with the margins (of the anchored item) that can make it work, have a look at the xml below which I have used successfully:

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_info" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="top|end"
    android:layout_marginBottom="0dp"
    android:layout_marginEnd="0dp"
    android:layout_marginLeft="0dp"
    android:layout_marginRight="0dp"
    android:layout_marginStart="0dp"
    android:layout_marginTop="0dp"
    android:src="@android:drawable/ic_media_play"
    app:layout_anchor="@id/fab"
    app:layout_anchorGravity="top" />

Try to use this app:useCompatPadding="true"

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fabBottom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:tint="@android:color/white"
    android:src="@mipmap/ic_search"
    app:fabSize="normal"
    android:scaleType="center"
    app:layout_anchor="@+id/bottomSheet"
    app:layout_anchorGravity="top|end"
    app:useCompatPadding="true"/>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fabTop"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:tint="@color/accent"
    android:src="@mipmap/ic_location_on"
    app:backgroundTint="@android:color/white"
    app:fabSize="normal"
    android:scaleType="center"
    android:layout_gravity="top|end"
    app:layout_anchor="@+id/fabSearch"
    app:layout_anchorGravity="top|end"
    android:layout_margin="12dp"/>

Here is my solution, just put an invisible fab between the two fabs, and works well with CoordinatorLayout.

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@drawable/ic_check" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_invisible"
    android:layout_width="@dimen/fab_margin"
    android:layout_height="@dimen/fab_margin"
    android:layout_gravity="top|end"
    android:layout_margin="@dimen/fab_margin"
    android:visibility="invisible"
    app:layout_anchor="@id/fab"
    app:layout_anchorGravity="top" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_follow"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="top|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@drawable/ic_gps_fixed_follow"
    app:backgroundTint="@android:color/white"
    app:layout_anchor="@id/fab_invisible"
    app:layout_anchorGravity="top" />

No Snackbar

With Snackbar

I can't believe no one has posted the correct answer.

Wrap the buttons in a ViewGroup and apply the dodgeInsetEdges layout parameter so that the buttons move up with the bottom sheet. For the above use case, we can use a LinearLayout with the XML attribute app:layout_dodgeInsetEdges="bottom".

Note that we can apply this to any view in a CoordinatorLayout.

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

    <!-- We can use any ViewGroup here. LinearLayout is the
         obvious choice for the questioner's use case. -->
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:orientation="vertical"
        app:layout_dodgeInsetEdges="bottom">

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/upperFab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/fab_margin"
            android:src="@drawable/upper_fab_icon" />

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/lowerFab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/lower_fab_icon" />

    </LinearLayout>

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

This works for me - FABs are embedded in Relative layout:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="com.github.openeet.openeet.SaleDetailActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/appbar_padding_top"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/AppTheme.PopupOverlay">

        </android.support.v7.widget.Toolbar>

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

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

    <android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_margin="@dimen/fab_margin"
        android:layout_gravity="end|bottom" >


        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab_share"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end|bottom"
            android:src="@android:drawable/ic_menu_share"
            android:layout_alignParentBottom="true"
            android:layout_alignLeft="@+id/fab_print"
            android:layout_alignStart="@+id/fab_print" />

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab_print"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end|bottom"
            android:src="@android:drawable/ic_media_next"
            android:layout_above="@+id/fab_share"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_marginBottom="46dp" />

    </RelativeLayout>

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

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_scrolling"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="@dimen/big_activity_fab_margin"
    android:src="@drawable/ic_share_white_24dp"
    app:layout_anchor="@id/app_bar_scrolling"
    app:layout_anchorGravity="bottom|end" />
<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_scrolling2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="65dp"
    android:src="@drawable/ic_share_white_24dp"
    app:layout_anchor="@id/app_bar_scrolling"
    app:layout_anchorGravity="bottom|end" />

---

this is work for me. the key code is android:layout_margin="65dp"

A very simple way (that worked for me!) was to just put the two floating buttons in a vertical linear layout at the bottom/end of its parent.

    <LinearLayout
    android:layout_gravity="bottom|end"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginEnd="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_menu_send" />
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_menu_send" />
</LinearLayout>

Just adjust the layout_margin attributes for the floating buttons to get the spacing as you want it.