riff_app/app/src/main/res/drawable/launch_screen.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
    android:opacity="opaque">
    <!-- The background color, preferably the same as your normal theme -->
    <item android:drawable="@color/black"/>
    <!-- Your product logo - 144dp color version of your app icon -->

    <item
        >
        <bitmap
            android:src="@mipmap/ic_launcher"
            android:gravity="center"
            />
    </item>
</layer-list>