legado/app/src/main/res/layout/activity_chapter_list.xml

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <com.google.android.material.appbar.MaterialToolbar
            android:theme="@style/ThemeOverlay.Material3.Toolbar.CircleNavigationButton"
            android:id="@+id/top_bar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"
            app:navigationIcon="@drawable/ic_arrow_back"
            app:title="" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginHorizontal="16dp">

            <com.google.android.material.tabs.TabLayout
                android:id="@+id/tab_layout"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="?attr/colorSurface"
                app:tabGravity="fill"
                app:tabMode="fixed" />

            <com.google.android.material.button.MaterialButton
                android:layout_width="32dp"
                android:layout_height="32dp"
                android:clickable="true"
                android:checkable="true"
                app:icon="@drawable/ic_toc"
                style="@style/Widget.Material3Expressive.Button.IconButton.Tonal"/>

        </LinearLayout>



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

    <!-- ViewPager 作为滚动内容 -->
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/app_bar" />

</androidx.constraintlayout.widget.ConstraintLayout>