ProjectLaogai/app/src/main/res/drawable/background_splash.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item
            android:drawable="@color/colorPrimary"/>

    <item>
        <bitmap
                android:gravity="center"
                android:src="@drawable/ic_launcher"/>
    </item>

</layer-list>