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.
The APK is signed by Google and installs on top of your existing Play Store. It's safe to install if you'd rather have the latest version without having to wait for Google to randomly push it to your device. Download and install it just like any other APK. 1  Android Police mirror #1.