If your app is using background image for splash, display it as soon as posible, with full width on each device, centered on top

app_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:dither="true"
    android:gravity="top|fill_horizontal"
    android:src="@drawable/splash_bg"
    android:tileMode="disabled" />

style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.MyFullTheme" parent="android:Theme.Light.NoTitleBar">
        <item name="android:windowBackground">@drawable/app_bg</item>
</style>
</resources>