Signal-Android/app/src/main/res/layout/chat_color_selection_fragment.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:layout_width="match_parent"
    android:layout_height="match_parent">

    <org.thoughtcrime.securesms.util.views.DarkOverflowToolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:theme="?attr/settingsToolbarStyle"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navigationIcon="@drawable/ic_arrow_left_24"
        app:title="@string/ChatColorSelectionFragment__chat_color"
        app:titleTextAppearance="@style/Signal.Text.Title" />

    <org.thoughtcrime.securesms.conversation.colors.ui.ChatColorPreviewView
        android:id="@+id/preview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:ccpv_chat_bubble_count="2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/toolbar" />

    <View
        android:id="@+id/divider"
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/signal_inverse_transparent_05"
        app:layout_constraintTop_toBottomOf="@id/preview" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:clipToPadding="false"
        android:orientation="vertical"
        android:paddingTop="24dp"
        android:paddingBottom="72dp"
        android:scrollbarStyle="outsideOverlay"
        app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/divider"
        app:spanCount="4"
        tools:itemCount="24"
        tools:listitem="@layout/chat_color_selection_adapter_item" />

</androidx.constraintlayout.widget.ConstraintLayout>