1. Create 4096x4096 image on https://pixlr.com/e/ or somwhere else
2. Use tool like https://apetools.webprofusion.com/#/tools/imagegorilla to generate full pack of drawable
3. On Android Studio, open Resource Manager (View > Tool Windows > Resource Manager ) and add downloaded drawable bundle in previous stage
4. Edit launch_background.xml somehow like below:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"><item android:drawable="@android:color/white" />
<item><bitmap
android:gravity="center"
android:src="@drawable/screen" /></item>
</layer-list>