我在看一些源代码。我找到了一个最好的可扩展fab（浮动操作按钮）
让我添加那些源代码。将其添加到build.gradle

implementation 'com.nambimobile.widgets:expandable-fab:1.0.2'

将以下源代码添加到布局

<!-- This is NOT a root view, but should be a child of whatever root view you 

choose (CoordinatorLayout, ConstraintLayout, etc) -->
<com.nambimobile.widgets.efab.ExpandableFabLayout
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <!-- The next 3 Views will only display in portrait orientation -->          
  <com.nambimobile.widgets.efab.Overlay
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:overlay_orientation="portrait"/>
  <com.nambimobile.widgets.efab.ExpandableFab
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_marginBottom="@dimen/ui_margin_medium"
    android:layout_marginEnd="@dimen/ui_margin_medium"
    android:layout_marginRight="@dimen/ui_margin_medium"
    app:efab_orientation="portrait"/>
  <com.nambimobile.widgets.efab.FabOption
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:fab_orientation="portrait"
    app:label_text="Portrait Option 1"
    android:onClick="onClickPortraitOption1"/>

  <!-- The next 3 Views will only display in landscape orientation -->
  <com.nambimobile.widgets.efab.Overlay
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:overlay_orientation="landscape"/>
  <com.nambimobile.widgets.efab.ExpandableFab
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_marginBottom="@dimen/ui_margin_medium"
    android:layout_marginEnd="@dimen/ui_margin_medium"
    android:layout_marginRight="@dimen/ui_margin_medium"
    app:efab_orientation="landscape"/>
  <com.nambimobile.widgets.efab.FabOption
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:fab_orientation="landscape"
    app:label_text="Landscape Option 1"
    android:onClick="onClickLandscapeOption1"/>

</com.nambimobile.widgets.efab.ExpandableFabLayout>

然后，您可以像在java文件中使用on按钮一样使用这些fab。
让我加上那个链接