Density specific launcher icons are not used. Icons included in platform/res/drawable-<res>/ folders are not used.
As described in https://wiki.appcelerator.org/display/guides/Using+density-specific+resources+on+Android#Usingdensity-specificresourcesonAndroid-Theappicon , folders for specific icons resolutions are created.
Different versions of myAppicon.png file is put inside each folder, however only the file icon specified in TiAPP.xml (<icon>/path-to-icon/myAppicon.png</icon>) is actually used. Other versions (set with the same name) inside res/drawable folder are ignored.
Same result if using the default appicon.png filename
Customer ticket link: http://support-admin.appcelerator.com/display/APP-536715