session-android/app/src/main/res/layout/activity_appearance_settings.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    tools:context="org.thoughtcrime.securesms.preferences.appearance.AppearanceSettingsActivity"
    android:id="@+id/scrollView"
    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">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:textColor="?android:textColorTertiary"
            android:textSize="@dimen/medium_font_size"
            android:paddingHorizontal="@dimen/large_spacing"
            android:paddingVertical="@dimen/small_spacing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/activity_appearance_themes_category"/>

        <androidx.cardview.widget.CardView
            app:cardElevation="0dp"
            app:cardCornerRadius="@dimen/dialog_corner_radius"
            android:layout_marginHorizontal="@dimen/medium_spacing"
            app:cardBackgroundColor="?colorSettingsBackground"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <LinearLayout
                android:orientation="vertical"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <LinearLayout
                    android:id="@+id/theme_option_classic_dark"
                    android:addStatesFromChildren="true"
                    android:background="?selectableItemBackground"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:paddingHorizontal="@dimen/small_spacing"
                    android:paddingVertical="@dimen/small_spacing"
                    android:orientation="horizontal">
                    <ImageView
                        android:theme="@style/Classic.Dark"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/ic_themepreview"/>
                    <TextView
                        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
                        android:lines="1"
                        android:textSize="16sp"
                        android:text="@string/classic_dark_theme_name"
                        android:padding="@dimen/medium_spacing"
                        android:layout_gravity="center"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"/>
                    <RadioButton
                        android:id="@+id/theme_radio_classic_dark"
                        android:layout_gravity="center"
                        android:layout_margin="@dimen/small_spacing"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"/>
                </LinearLayout>

                <View
                    android:alpha="0.15"
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="?android:textColorPrimary"/>

                <LinearLayout
                    android:id="@+id/theme_option_classic_light"
                    android:addStatesFromChildren="true"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="?selectableItemBackground"
                    android:paddingHorizontal="@dimen/small_spacing"
                    android:paddingVertical="@dimen/small_spacing"
                    android:orientation="horizontal">
                    <ImageView
                        android:theme="@style/Classic.Light"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/ic_themepreview"/>
                    <TextView
                        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
                        android:textSize="16sp"
                        android:lines="1"
                        android:text="@string/classic_light_theme_name"
                        android:padding="@dimen/medium_spacing"
                        android:layout_gravity="center"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"/>
                    <RadioButton
                        android:id="@+id/theme_radio_classic_light"
                        android:layout_gravity="center"
                        android:layout_margin="@dimen/small_spacing"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"/>
                </LinearLayout>

                <View
                    android:alpha="0.15"
                    android:layout_marginHorizontal="@dimen/medium_spacing"
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="?android:textColorPrimary"/>

                <LinearLayout
                    android:id="@+id/theme_option_ocean_dark"
                    android:addStatesFromChildren="true"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="?selectableItemBackground"
                    android:paddingHorizontal="@dimen/small_spacing"
                    android:paddingVertical="@dimen/small_spacing"
                    android:orientation="horizontal">
                    <ImageView
                        android:theme="@style/Ocean.Dark"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/ic_themepreview"/>
                    <TextView
                        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
                        android:textSize="16sp"
                        android:lines="1"
                        android:text="@string/ocean_dark_theme_name"
                        android:padding="@dimen/medium_spacing"
                        android:layout_gravity="center"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"/>
                    <RadioButton
                        android:id="@+id/theme_radio_ocean_dark"
                        android:layout_gravity="center"
                        android:layout_margin="@dimen/small_spacing"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"/>
                </LinearLayout>

                <View
                    android:alpha="0.15"
                    android:layout_marginHorizontal="@dimen/medium_spacing"
                    android:layout_width="match_parent"
                    android:layout_height="1dp"
                    android:background="?android:textColorPrimary"/>

                <LinearLayout
                    android:id="@+id/theme_option_ocean_light"
                    android:addStatesFromChildren="true"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="?selectableItemBackground"
                    android:paddingHorizontal="@dimen/small_spacing"
                    android:paddingVertical="@dimen/small_spacing"
                    android:orientation="horizontal">
                    <ImageView
                        android:theme="@style/Ocean.Light"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/ic_themepreview"/>
                    <TextView
                        android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
                        android:textSize="16sp"
                        android:lines="1"
                        android:text="@string/ocean_light_theme_name"
                        android:padding="@dimen/medium_spacing"
                        android:layout_gravity="center"
                        android:layout_width="0dp"
                        android:layout_weight="1"
                        android:layout_height="wrap_content"/>
                    <RadioButton
                        android:id="@+id/theme_radio_ocean_light"
                        android:layout_gravity="center"
                        android:layout_margin="@dimen/small_spacing"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"/>
                </LinearLayout>

            </LinearLayout>
        </androidx.cardview.widget.CardView>



        <TextView
            android:textColor="?android:textColorTertiary"
            android:textSize="@dimen/medium_font_size"
            android:paddingHorizontal="@dimen/large_spacing"
            android:paddingVertical="@dimen/small_spacing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/activity_appearance_primary_color_category"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/preference_single"
            android:orientation="vertical">

            <LinearLayout
                android:layout_marginTop="@dimen/large_spacing"
                android:background="@drawable/fake_chat_view_incoming_message_background"
                android:padding="12dp"
                android:layout_marginHorizontal="@dimen/very_large_spacing"
                android:layout_gravity="start"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <TextView
                    android:textSize="12sp"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="?message_received_text_color"
                    android:text="How are you?"
                    android:gravity="center"
                    android:drawablePadding="12dp"
                    app:drawableLeftCompat="@drawable/quote_accent_line"
                    tools:ignore="HardcodedText" />
                <TextView
                    android:layout_marginTop="4dp"
                    android:text="I'm good thanks, you?"
                    android:textColor="?message_received_text_color"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    tools:ignore="HardcodedText" />
            </LinearLayout>

            <LinearLayout
                android:layout_marginVertical="@dimen/large_spacing"
                android:background="@drawable/fake_chat_view_outgoing_message_background"
                android:padding="12dp"
                android:layout_marginHorizontal="@dimen/very_large_spacing"
                android:layout_gravity="end"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <TextView
                    android:text="I'm doing great, thanks."
                    android:textColor="?message_sent_text_color"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    tools:ignore="HardcodedText" />
            </LinearLayout>

        </LinearLayout>

        <LinearLayout
            android:id="@+id/accent_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_marginVertical="@dimen/small_spacing"
            android:layout_marginHorizontal="@dimen/small_spacing">
            <View
                android:id="@+id/accent_green"
                android:background="@drawable/padded_circle_tintable"
                android:backgroundTint="@color/accent_green"
                android:foreground="@drawable/radial_select"
                android:layout_width="@dimen/radial_size"
                android:layout_height="@dimen/radial_size"/>
            <View
                android:id="@+id/accent_blue"
                android:background="@drawable/padded_circle_tintable"
                android:backgroundTint="@color/accent_blue"
                android:foreground="@drawable/radial_select"
                android:layout_width="@dimen/radial_size"
                android:layout_height="@dimen/radial_size"/>
            <View
                android:id="@+id/accent_yellow"
                android:background="@drawable/padded_circle_tintable"
                android:backgroundTint="@color/accent_yellow"
                android:foreground="@drawable/radial_select"
                android:layout_width="@dimen/radial_size"
                android:layout_height="@dimen/radial_size"/>
            <View
                android:id="@+id/accent_pink"
                android:background="@drawable/padded_circle_tintable"
                android:backgroundTint="@color/accent_pink"
                android:foreground="@drawable/radial_select"
                android:layout_width="@dimen/radial_size"
                android:layout_height="@dimen/radial_size"/>
            <View
                android:id="@+id/accent_purple"
                android:background="@drawable/padded_circle_tintable"
                android:backgroundTint="@color/accent_purple"
                android:foreground="@drawable/radial_select"
                android:layout_width="@dimen/radial_size"
                android:layout_height="@dimen/radial_size"/>
            <View
                android:id="@+id/accent_orange"
                android:background="@drawable/padded_circle_tintable"
                android:backgroundTint="@color/accent_orange"
                android:foreground="@drawable/radial_select"
                android:layout_width="@dimen/radial_size"
                android:layout_height="@dimen/radial_size"/>
            <View
                android:id="@+id/accent_red"
                android:background="@drawable/padded_circle_tintable"
                android:backgroundTint="@color/accent_red"
                android:foreground="@drawable/radial_select"
                android:layout_width="@dimen/radial_size"
                android:layout_height="@dimen/radial_size"/>
        </LinearLayout>

        <TextView
            android:textColor="?android:textColorTertiary"
            android:textSize="@dimen/medium_font_size"
            android:paddingHorizontal="@dimen/large_spacing"
            android:paddingVertical="@dimen/small_spacing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/activity_appearance_follow_system_category"/>

        <androidx.cardview.widget.CardView
            app:cardElevation="0dp"
            android:elevation="0dp"
            app:cardBackgroundColor="?colorSettingsBackground"
            app:cardCornerRadius="@dimen/dialog_corner_radius"
            android:layout_margin="@dimen/medium_spacing"
            android:layout_marginBottom="@dimen/massive_spacing"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <LinearLayout
                android:id="@+id/system_settings_switch_holder"
                android:background="?selectableItemBackground"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:addStatesFromChildren="true"
                android:gravity="center">
                <TextView
                    android:textColor="?android:textColorPrimary"
                    android:textStyle="bold"
                    android:textSize="@dimen/medium_font_size"
                    android:paddingHorizontal="@dimen/large_spacing"
                    android:paddingVertical="@dimen/small_spacing"
                    android:text="@string/activity_appearance_follow_system_explanation"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"/>
                <com.google.android.material.switchmaterial.SwitchMaterial
                    android:id="@+id/system_settings_switch"
                    android:paddingHorizontal="@dimen/large_spacing"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"/>
            </LinearLayout>
        </androidx.cardview.widget.CardView>

    </LinearLayout>
</ScrollView>