 To make an APK file, a program for Android is first compiled using Android Studio, and then all of its parts are packaged into one container file.An APK file contains all of a program's code (such as .dex files), resources, assets, certificates, and manifest file.As is the case with many file formats, APK files can have any name needed, but it may be required that the file name ends in the file extension ".apk" for being recognized as such.