I bought 3 baby puffer fish and they don&#39;t seem to be eating pellets, flakes or bloodworms.
Apk is the android package. R.java (auto generated file) when compiled along with .class (java classes) generated .dex file but these files are not deployable. .dex files are then reprocessed along with manifest file, and other resources (mp3, video, image) and .apk file is generated. This file is deployable.
It summarizes some of the tasks you'll need to complete before publishing your app on Google Play, such as creating a signed, release-ready application package (APK), understanding the requirements of the app, and creating the product page and graphic assets for each of your apps.