Corona Simulator builds do not currently support xxhdpi icons. Corona only supports the icons documented here…
http://docs.coronalabs.com/daily/guide/distribution/buildSettings/index.html#android
But that said, since you are using Corona Enterprise, you can easily add xxhdpi icon support by adding that icon to the appropriate “res” directory. You have full control over this.
Also note that image files “Icon-hdpi.png”, “Icon-xhdpi.png”, etc. are not used by Corona Enterprise builds. Those files are only supported by Corona Simulator builds. When using Corona Enterprise, you are really using the Android SDK build system and therefore you are expected to set up your application project according to Google’s documentation. Google documents how to set up your “launcher” icons here…
http://developer.android.com/design/style/iconography.html
http://developer.android.com/guide/topics/manifest/application-element.html#icon