tachiyomi/app/src/main/res/layout/main_activity.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.bluelinelabs.conductor.ChangeHandlerFrameLayout
        android:id="@+id/controller_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0">

    </com.bluelinelabs.conductor.ChangeHandlerFrameLayout>

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?attr/colorSecondary"
        android:stateListAnimator="@null"
        android:theme="?attr/actionBarTheme"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <eu.kanade.tachiyomi.ui.base.CenteredToolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorSecondary">

            <LinearLayout
                android:id="@+id/title_layout"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:orientation="horizontal">

                <com.google.android.material.textview.MaterialTextView
                    android:id="@+id/toolbar_title"
                    style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:ellipsize="end"
                    android:gravity="start"
                    android:maxLines="1"
                    android:textColor="?actionBarTintColor"
                    android:textSize="20sp"
                    tools:text="Title Text" />

                <ImageView
                    android:id="@+id/dropdown"
                    android:visibility="gone"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginStart="4dp"
                    android:src="@drawable/ic_arrow_drop_down_24dp"
                    android:tint="?actionBarTintColor" />
            </LinearLayout>
        </eu.kanade.tachiyomi.ui.base.CenteredToolbar>
    </com.google.android.material.appbar.AppBarLayout>

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_nav"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?colorPrimaryVariant"
        app:itemIconTint="@drawable/bottom_nav_item_selector"
        app:itemRippleColor="@color/rippleColor"
        app:itemTextColor="@drawable/bottom_nav_item_selector"
        app:labelVisibilityMode="labeled"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_navigation"
        app:tabRippleColor="@color/rippleColor"
        app:tabTextColor="?attr/tabBarIconColor" />
</androidx.constraintlayout.widget.ConstraintLayout>