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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/tool_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:displayHomeAsUp="false"
        app:fitStatusBar="false" />

    <com.google.android.material.progressindicator.LinearProgressIndicator
        android:id="@+id/refresh_progress_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:indeterminate="true" />

    <io.legado.app.ui.widget.recycler.scroller.FastScrollRecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />

    <FrameLayout
        android:id="@+id/cl_toc"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="vertical"
        android:visibility="gone">

        <FrameLayout
            android:id="@+id/fl_hide_toc"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="top"
            android:elevation="4dp"
            app:layout_constraintTop_toTopOf="parent">

            <androidx.constraintlayout.utils.widget.ImageFilterView
                android:id="@+id/iv_hide_toc"
                android:layout_width="match_parent"
                android:layout_height="36dp"
                android:background="?attr/selectableItemBackground"
                android:src="@drawable/ic_arrow_down" />

        </FrameLayout>

        <com.google.android.material.loadingindicator.LoadingIndicator
            android:id="@+id/loading_toc"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:layout_gravity="center"
            android:visibility="gone"
            app:layout_constraintBottom_toBottomOf="@+id/recycler_view_toc"
            app:layout_constraintLeft_toLeftOf="@+id/recycler_view_toc"
            app:layout_constraintRight_toRightOf="@+id/recycler_view_toc"
            app:layout_constraintTop_toTopOf="@+id/recycler_view_toc" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler_view_toc"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/fl_hide_toc" />

    </FrameLayout>

    <LinearLayout
        android:id="@+id/ll_bottom_bar"
        android:layout_width="match_parent"
        android:layout_height="36dp"
        android:layout_gravity="bottom"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingLeft="10dp"
        android:paddingRight="10dp">

        <TextView
            android:id="@+id/tv_dur"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:ellipsize="middle"
            android:gravity="center_vertical"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:singleLine="true"
            android:textSize="12sp" />

        <androidx.appcompat.widget.AppCompatImageView
            android:id="@+id/iv_top"
            android:layout_width="36dp"
            android:layout_height="match_parent"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:contentDescription="@string/go_to_top"
            android:src="@drawable/ic_arrow_drop_up"
            android:tooltipText="@string/go_to_top"
            tools:ignore="UnusedAttribute" />

        <androidx.appcompat.widget.AppCompatImageView
            android:id="@+id/iv_bottom"
            android:layout_width="36dp"
            android:layout_height="match_parent"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:contentDescription="@string/go_to_bottom"
            android:src="@drawable/ic_arrow_drop_down"
            android:tooltipText="@string/go_to_bottom"
            tools:ignore="UnusedAttribute" />
    </LinearLayout>

</LinearLayout>