o3de/Code/Tools/Android/ProjectBuilder/splash_screen.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0099cc"
    tools:context=".LumberyardActivity">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/splash_image"
        android:background="#414141"
        android:src="@drawable/app_splash"
        android:scaleType="centerCrop" />
</RelativeLayout>