使用 layout_scrollFlags 时从软键按钮栏隐藏的底部对齐按钮

如何解决使用 layout_scrollFlags 时从软键按钮栏隐藏的底部对齐按钮

我想在屏幕底部对齐一个按钮，就在软键按钮栏的上方。问题是当我将 app:layout_scrollFlags="scroll" 添加到 Toolbar 时，按钮被绘制在该栏下方。系统似乎忽略了软键按钮栏的存在并在其后面绘制了视图。

activity_layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
    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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="false"
    tools:openDrawer="start">

    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appBarLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:layout_scrollFlags="scroll"/>

        </com.google.android.material.appbar.AppBarLayout>

        <fragment
            android:id="@+id/nav_host_fragment"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:defaultNavHost="true"
            app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
            app:navGraph="@navigation/drawer_nav_graph" />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/navigation_view"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        app:headerLayout="@layout/drawer_header"
        app:menu="@menu/drawer_menu" />

</androidx.drawerlayout.widget.DrawerLayout>

fragment_layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:name="com.femtec.health.ui.oneTimePurchaseProducts.OneTimePurchaseProductsFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.oneTimePurchaseProducts.OneTimePurchaseProductsFragment">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="16dp"
        app:layoutManager="linearlayoutmanager"
        app:layout_constraintTop_toTopOf="parent"
        tools:listitem="@layout/item_one_time_purchase_products"
        tools:orientation="horizontal" />

    <Button
        android:id="@+id/bottom_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        android:text="Bottom button"/>

</androidx.constraintlayout.widget.ConstraintLayout>