Signal-Android/res/layout/sticker_keyboard_icon_dark_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="@dimen/media_keyboard_provider_icon_margin"
    android:padding="@dimen/media_keyboard_provider_icon_padding"
    android:background="@drawable/media_keyboard_selected_background_dark">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:srcCompat="@drawable/ic_sticker_solid_24" />

</FrameLayout>